CN106660098B

CN106660098B - Press-processing method

Info

Publication number: CN106660098B
Application number: CN201580041462.0A
Authority: CN
Inventors: 澄川智史; 石渡亮伸; 平本治郎
Original assignee: NKK Corp
Current assignee: JFE Engineering Corp
Priority date: 2014-07-30
Filing date: 2015-05-11
Publication date: 2018-09-21
Anticipated expiration: 2035-05-11
Also published as: MX2017001212A; KR20170021867A; CN106660098A; WO2016017228A1; JP2016030290A; JP5861749B1; KR101914980B1

Abstract

The press-processing method of the present invention is characterized in that, when being formed with the formed products for the flange being bent like that protrudes or be recessed to trench bottom side, the first forming process is carried out using the first mold, the second forming process is carried out using the second mold, the longitudinal wall forming section of first groove shape forming section (9) of the first mold and first flange forming section (11) angulation are set to be large longitudinal wall forming section and second flange forming section (19) angulation in the second groove shape forming section (17) of the second mold, so as to make the residual strain (residual strain) that the line length of length direction changes making line length deform on the contrary in the second forming process what the flange part of formed products (125) generated come by way of returning in the first forming process, formed products are carried out stamping.

Description

Press-processing method

Technical field

The present invention relates to the press-processing method for shaping formed products (press forming part), which has Groove shape portion (channel-shaped potion), in a pair of of longitudinal wall part (the side wall for forming the groove shape portion Portion have with to trench bottom (the channel bottom in the groove shape portion in the longitudinal wall part of at least one party) Portion) mode of side protrusion or recess is bent the flange part (flange portion) of (curve).

Background technology

Stamping is to material (steel sheet) (blank (blank)) compaction mold (tool as its object Of press forming), the method that the shape of mold is thus subjected to the processing of blank to blank transfer.Stamping In, by stamping product after mold taking-up, generate due to the residual stress (residual in the stamping product Stress it is i.e. so-called) to carry out shape defect (defect of shape) caused by elastic recovery (elastic recovery) It springs back (springback).As cause, the shape of stamping product repeated with desirable variform problem.

About the rebound which kind of degree occurs, mainly by the larger impact of the intensity of material (strength).Recently, especially It is centered on automobile industry, from lightweight (the weight reduction of of body of a motor car (automotive body) Automotive body) from the perspective of and bodywork parts (automotive part) use high intensity steel plate (high- Strength steel sheet) tendency become strong.Along with the high intensity of such material, the degree for generating rebound becomes Greatly.Therefore, in order to make the shape of the stamping product after rebound close to design shape, in production scene, practician has to It corrects mold several times and trial and error is repeated.As a result, becoming long-term during the production of the stamping products such as bodywork parts Change.Therefore, the case where developing the method that can be effectively reduced rebound cut down automobile exploitation during or cost in terms of can To say being also more important project.

In order to reduce rebound, control necessity of the stress (stress) as its occurrence cause is indispensable.As control Stress reduces the prior art of rebound, there is that for example described in Patent Document 1 " sheet metal (steel sheet's) strikes out Shape die device ".Proposed in patent document 1 to carnival hat type section parts (hat-shaped section part) into When row crash forming (crash forming), the mold by being equipped with embossed edge muscle (bead) in flange part rushes blank The method of pressing formation.This method before will reaching lower dead center (bottom dead center) until utilize embossed edge muscle by base Material locks and assigns elongation strain (tensile deformation) to the longitudinal wall part of blank, eliminates the warpage as longitudinal wall part (curl) stress difference in the plate thickness direction of the reason of.

In addition, as other examples, patent document 2 is proposed through the blank branch in the periphery for being set to punch (punch) The mold that recess is equipped at frame (blank holder) carries out blank stamping method.In the method, it is striking out During shape, blank end enters in the recess of charge support, if stamping further progress, blank end card are hung on Recess inner wall and as the state that is restricted.Therefore, blank no longer flows outwardly.Thus, in the method, it will reach Before lower dead center can into the longitudinal wall part imparting face of blank compression stress (in-plane compressive stress), by This, can eliminate the stress difference in plate thickness direction.

In addition, as another example, a kind of press-processing method is proposed in patent document 3, " is had：First forming work Sequence, in the level of curvature (curvature) central link comprising the cross part and bending section for intersecting longitudinal wall part with flange part In line and the plane vertical with high-strength steel sheet, bending process is carried out to flange part until flange part is relative to institute using cross part Stating horizontal angle becomes α₁Until；And second forming process, in the plane, using cross part to first forming Flange part after process carries out additional bending process until flange part becomes α relative to the horizontal angle₂Until, it will be by α₁-α₂The addition bending angle β of expression is set as defined range " (with reference to paragraph [0016]~[0017] of patent document 3).

Citation

Patent document

Patent document 1：No. 4090028 bulletins of Japanese Patent No.

Patent document 2：Japanese Unexamined Patent Publication 2010-99700 bulletins

Patent document 3：No. 5382281 bulletins of Japanese Patent No.

Invention content

The subject that the invention solves

In method described in Patent Document 1, flanging muscle shape remains on the flange part of the part of forming, therefore is assembling In process, unfavorable condition may will produce in the welding with other parts.Therefore, it is necessary to the flanging muscle in the part to forming The part of shape remaining is cut, or is extended charge length and entered in product to avoid flanging muscle shape.

In addition, the prior art that patent document 1,2 is recorded is as only for due to rebound and in the generation of specific section For the countermeasure of change in shape effectively.Mostly it is torsion (torsion), bending however, in the actual part after stamping (bending) such the case where the three-dimensionality rebound that part integrally generates becomes problem.Thus, patent document 1,2 is remembered The prior art of load does not become sufficient countermeasure for such a problem.

On the other hand, in press-processing method described in Patent Document 3, flanging muscle shape does not remain on formation of parts, And it can be expected that effect as the torsion of formation of parts entirety, warpage can be reduced.However, method disclosed in patent document 3 For, in the first forming process, " including the cross part and bending section for intersecting longitudinal wall part with flange part the center of curvature connection Horizontal line and the plane vertical with high-strength steel sheet in, bending process is carried out to flange part until flange part phase using cross part α is become for the horizontal angle₁Until ".That is, the forming of press-processing method described in Patent Document 3 can be applied Part is defined as such part being bent in the horizontal plane shown in Fig. 1, Fig. 3 of patent document 3 etc..Accordingly, with respect to this Shen Please invent for object " have groove shape portion, formed the groove shape portion longitudinal wall part at least one party longitudinal wall part have with To the trench bottom side in the groove shape portion protrude or be recessed mode be bent so-called upper warpage (upward camber), have a downwarp The formed products in the bent flanges portion of bent (downward camber) ", can not apply press-processing method described in Patent Document 3.

The present invention makes in order to solve the above problem, and its purpose is to provide one kind about flange part as described above The formed products in the bent flanges portion with upper warpage or lower warpage do not change shape of product and can reduce torsion, bending in this way Three-dimensionality rebound press-processing method.

Solution for solving the problem

The present inventors in order to solve the above problems, about shaping Figure 33 and formed products as shown in Figure 34 are (convex Formed products 121, under convex formed products 127) when the rebound that generates, have studied its genesis mechanism etc..

Convex formed products 121, under convex formed products 127 all there is the groove shape that is made of trench bottom 123a and longitudinal wall part 123b Portion 123 and the flange part 125 that (out-of-plane direction) is bent to outside face.It should be noted that shown in Figure 33 Convex formed products 121 in the case of, become to the flange part 125 of out-of-plane bending so that flange part 125 becomes to trench bottom The shape that the mode of the sides 123a protrusion (convex) is bent.On the other hand, shown in Figure 34 under convex formed products 127 in the case of, Become to the flange part 125 of out-of-plane bending so that flange part 125 is recessed the shape that the mode of (under convex) is bent to the sides trench bottom 123a Shape.

In the past, in the case where carrying out crash forming to convex formed products 121, use example punch die as shown in figure 35 (die) 143 and punch 145, sandwich blank 21 as shown in figure 37, thus by blank 21 it is stamping be convex formed products 121.And And in the case where convex formed products 127 carry out crash forming under, use example punch die 149 as shown in figure 36 and punch 151, With Figure 37 shown in it is stamping in the same manner as sandwich blank 21, thus by blank 21 is stamping be under convex formed products 127.

Figure 38 A, Figure 38 B and Figure 39 A, Figure 39 B are returning for the formed products that explanation is shaped by previous press-processing method The figure of the genesis mechanism of bullet.Figure 38 A and Figure 38 B are to illustrate to shape blank end when convex formed products 121 by existing method The definition graph of the variation of the line length of (flange end).Figure 39 A and Figure 39 B are about the same theory under forming when convex formed products 127 Bright figure.Figure 38 A and Figure 39 A respectively be forming after (lower dead center) convex formed products 121 and under convex formed products 127 sectional view. Figure 38 B and Figure 39 B are the line lengths at the blank end (flange end) before and after forming when illustrating side view observation blank 21 (with reference to Figure 37) The figure of variation.It should be noted that in Figure 38 B and Figure 39 B, the line length at the blank end before forming is indicated by filament, after forming The line length of end, that is, flange end of flange 125 indicated by thick line.Moreover, in Figure 38 A, Figure 38 B and Figure 39 A, Figure 39 B, it is black Point O be convex formed products 121 and under convex formed products 127 flexural center.

In the case of convex formed products 121, as shown in Figure 38 A, Figure 38 B, the radius of curvature of the flange end after forming (radius of curvature) reduces than the blank before forming.It is accompanied by this, the line length of the axis direction of flange end shortens (A₀B₀→A₁B₁).That is, flange part 125, which becomes, shrinks flange deformation (shrink flange deformation), in lower dead center Place, in the compression stress (compressive stress) of the remaining length direction of flange part 125.

On the other hand, under in the case of convex formed products 127, as shown in Figure 39 A, Figure 39 B, the song of the flange end after forming Blank before the forming of rate radius ratio becomes larger.It is accompanied by this, the elongated (C of line length of the axis direction of flange end₀D₀→C₁D₁).That is, convex Edge 125 becomes elongation flange deformation (stretch flange deformation), residual in flange part 125 at lower dead center Deposit the tensile stress (tensile stress) of length direction.

The stress of flange part 125 is released at demoulding (die release), after stress release, in convex formed products 121 flange part 125 generates elongation strain (stretch deformation), and the flange part 125 of convex formed products 127 produces under Raw contraction distortion (shrink deformation).As a result, either (with reference to figure the convex formed products 121 the case where 40A) or under convex formed products 127 the case where which kind of (with reference to Figure 40 B) in the case of, all generate bending curvature than as target Shape of product reduces bouncing distortion (camber springback) as (radius of curvature increase).

It should be noted that Figure 40 A measure the convex formed products 121 after demoulding using 3 d shape testing device, then, So as to measure the section in the length direction center of shape and as target on CAD (computer aided design) software The consistent mode of same cross-sectional of shape of product carry out position pairing and illustrate.Figure 40 B are illustrated shown in progress and Figure 40 A The case where convex formed products 121 similarly handle and demould after under convex formed products 127.In Figure 40 A and Figure 40 B, solid line table Be shown as convex formed products 121 or under convex formed products 127 target shape of product (target product shape), dotted line indicate it is convex Formed products 121 or under convex formed products 127 measurement shape.

In addition, the product shape that the angle for only existing in the left and right sides of unilateral shape of product, longitudinal wall for flange part is different The different shape of product of the height of the left and right of shape, longitudinal wall, left and right the formed products of the different shape of product of flange width etc. carry out Stamping situation etc., due to demoulding when stress release (stress release) and formed products generate torsion (with reference to figure 16)。

As previously discussed, in the formed products with the flange part to out-of-plane bending, the residual stress of flange part is demoulding When be released, as a result, formed products integrally generate assign spring (camber springback), torsion rebound.Exist as a result, In such formed products, the reduction of the residual stress of flange part is for the rebound of formed products reduces it may be said that extremely important.

Therefore, the present inventors study about the method for residual stress for reducing flange part, have obtained following seeing Solution：In stamping process, the line that is generated in flange part when being assigned to flange part than blank material is configured to shape of product Then it is effective to return to the case where being shaped as shape of product into the line length for exercising flange part for the variation of long variation bigger.This hair It is bright to be made based on above-mentioned opinion, specifically by structure composition below.

Formed products are formed in the press-processing method of the present invention, and the formed products have groove shape portion, and described Formed products formed the groove shape portion a pair of of longitudinal wall part at least one party longitudinal wall part have flange part, the flange part with The mode protruded to the trench bottom side in the groove shape portion is bent, and the press-processing method is characterized in that, uses the first mould Tool carries out the first forming process, carries out the second forming process using the second mold, first mold has to the groove shape The first groove shape forming section that portion is formed and the first flange forming section that the flange part is formed, second mould Tool has angle of inclination the second groove shape forming section identical with the first groove shape forming section and the second flange forming section, leads to Cross the longitudinal wall forming section (side wall forming portion) of the first groove shape forming section of first mold with Cross part that the first flange forming section (flange forming portion) is intersected and with described in the cross part The flexure plane of the identical curvature of curvature of flange part and the first flange forming section angulation are angle [alpha]₁, by described Cross part that the longitudinal wall forming section of the second groove shape forming section of second mold intersects with the second flange forming section and Formed by flexure plane and the second flange forming section with curvature identical with the curvature of the flange part of the cross part Angle is angle [alpha]₂, on the basis of by the flexure plane from the flexure plane towards the trench bottom side will be set as negative and by its phase It tosses about and is set as timing, angle [alpha]₁With angle [alpha]₂Relationship be set as α₂<α₁, proceed as follows forming：Make the first one-tenth described What is generated in shape process makes the compression strain (compressive strain) that the line length of the length direction of the flange part shortens It is returned by assigning the deformation for making the line length elongation in second forming process.

In addition, the press-processing method of the present invention is based on the invention of above-mentioned record, which is characterized in that by described second The cross part that the longitudinal wall forming section of the second groove shape forming section of mold intersects with the second flange forming section Radius of curvature is set as ρ₀[mm], the flange width shaped using second forming process is set as L [mm], will access and make It springs back the effect of variation and back amount Δ ε (the Δ ε of the strain (strain) of fold (wrinkles) can be inhibited>0) the upper limit Value is set as Δ ε_maxWhen, the α₁With the α₂Meet following formula (1).

[mathematical expression 1]

In addition, formed products are formed in the press-processing method of the present invention, the formed products have groove shape portion, and Shape formed the groove shape portion a pair of of longitudinal wall part at least one party longitudinal wall part have flange part, the flange part with The mode being recessed to the trench bottom side in the groove shape portion is bent, and the press-processing method is characterized in that, uses the first mould Tool carries out the first forming process, carries out the second forming process using the second mold, first mold has to the groove shape The the first groove shape forming section (channel-shape forming portion) and the flange part is carried out that portion is formed First flange forming section of forming, second mold have angle of inclination and the first groove shape forming section identical second Groove shape forming section and the second flange forming section are shaped by the longitudinal wall of the first groove shape forming section of first mold Cross part that portion and the first flange forming section intersect and there is song identical with the curvature of the flange part of the cross part The flexure plane of rate and the first flange forming section angulation are angle [alpha]₁, pass through second slot of second mold Cross part that the longitudinal wall forming section in shape formable portion intersects with the second flange forming section and with described in the cross part The flexure plane of the identical curvature of curvature of flange part and the second flange forming section angulation are angle [alpha]₂, with described It will be set as negative on the basis of flexure plane towards the trench bottom side from the flexure plane and its opposite side is set as timing, angle [alpha]₁With Angle [alpha]₂Relationship be set as α₂<α₁, proceed as follows forming：Making for making to generate in first forming process is described The elongation strain (tensile strain) of the line length elongation of the length direction of flange part passes through in second forming process It assigns the deformation for making the line length shorten and returns.

In addition, the press-processing method of the present invention is based on the invention of above-mentioned record, which is characterized in that by described second The cross part that the longitudinal wall forming section of the second groove shape forming section of mold intersects with the second flange forming section Radius of curvature is set as ρ₀[mm], the flange width shaped using second forming process is set as L [mm], will access and make It springs back the effect of variation and back amount Δ ε (the Δ ε of the strain of fold can be inhibited>0) upper limit value is set as Δ ε_maxWhen, it is described α₁With the α₂Meet following formula (2).

[mathematical expression 2]

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that profit First forming process is carried out with crash forming.

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that logical It crosses draw forming (draw forming) and carries out first forming process.

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that In the case of formed products of the trench bottom with ram bottom for being formed in the groove shape portion, first forming process utilizes lining Pad (pad) presses the position for being equivalent to the ram bottom in blank and carries out stamping.

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of either one in the pair of longitudinal wall part is applicable in first forming process and second forming process.

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of two sides of the pair of longitudinal wall part is applicable in first forming process and second forming process.

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of bending is arranged in the entire axial length of the formed products, first mold and second mould The α of tool₁With the α₂Relationship be set as in a part for the mold axial direction of first mold and second mold α₂<α₁。

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of bending is arranged in the entire axial length of the formed products, first mold and second mould The α of tool₁With the α₂Relationship be set as α in the overall length of first mold and second mold₂<α₁。

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of bending is arranged in an axial part for the formed products, first mold and described the The α of two molds₁With the α₂The flange to bending of the relationship only in first mold and second mold It is set as α on the position that portion is formed₂<α₁。

In addition, the press-processing method of the present invention is based on the invention that above-mentioned any one is recorded, which is characterized in that The flange part of bending is arranged in an axial part for the formed products, first mold and described the The α of two molds₁With the α₂Relationship be set as α in the overall length of first mold and second mold₂<α₁。

Invention effect

The present invention press-processing method for the bending shape with upper warpage or lower warpage flange part formed products, Play the effect for not changing shape of product and three-dimensionality rebound as torsion, bending capable of being reduced.

Description of the drawings

Fig. 1 is the definition graph of the press-processing method (convex shape, crash forming) of embodiments of the present invention 1.

Fig. 2A is the stereogram of the first mold (convex shape, crash forming) of embodiments of the present invention 1.

Fig. 2 B are the A-A regarding sectional views of the first mold shown in Fig. 2A.

Fig. 3 A are the stereograms of the second mold (convex shape, crash forming) of embodiments of the present invention 1.

Fig. 3 B are that the B-B direction of the second mold shown in Fig. 3 A regards sectional view.

Fig. 4 A are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 1, are the first lower dead center and The sectional view of convex formed products at two lower dead centers.

Fig. 4 B are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 1, are the lines for indicating flange end The figure of long variation.

Fig. 5 A are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 1, are indicated in formation The figure of the relationship for the stress and strain that flange part generates.

Fig. 5 B are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 1, are indicated shown in Fig. 5 A The figure of the gradient of coordinate diagram.

Fig. 6 A are the definition graphs of the mechanism of other forms of the press-processing method of embodiments of the present invention 1.

Fig. 6 B are the figures for the line length variation for indicating flange end shown in Fig. 6 A.

Fig. 7 A are the definition graphs relative to the mechanism of the comparative example of the press-processing method of embodiments of the present invention 1.

Fig. 7 B are the figures for the line length variation for indicating flange end shown in Fig. 7 A.

Fig. 8 A are the stereograms (lower convex form, crash forming) of the first mold of embodiments of the present invention 2.

Fig. 8 B are the C-C regarding sectional views of the first mold shown in Fig. 8 A.

Fig. 9 A are the stereograms (lower convex form, crash forming) of the second mold of embodiments of the present invention 2.

Fig. 9 B are the D-D regarding sectional views of the second mold shown in Fig. 9 A.

Figure 10 A are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 2, are the first lower dead center and The sectional view of convex formed products under at two lower dead centers.

Figure 10 B are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 2, are the lines for indicating flange end The figure of long variation.

Figure 11 A are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 2, are indicated in formation The figure of the relationship for the stress and strain that flange part generates.

Figure 11 B are the definition graphs of the mechanism of the press-processing method of embodiments of the present invention 2, are indicated shown in Figure 11 A Coordinate diagram gradient figure.

Figure 12 A are the definition graphs of the mechanism of other forms of the press-processing method of embodiments of the present invention 2.

Figure 12 B are the figures for the line length variation for indicating flange end shown in Figure 12 A.

Figure 13 A are the definition graphs of the mechanism of the comparative example of the press-processing method of embodiments of the present invention 2.

Figure 13 B are the figures for the line length variation for indicating flange end shown in Figure 13 A.

Figure 14 is saying for press-processing method (convex shape, the having liner at crash forming) of embodiments of the present invention 3 Bright figure.

Figure 15 is the formed products (the different formed products of flange width) as the shaped object of embodiments of the present invention 4 Definition graph.

Figure 16 is the definition graph of the project to be solved of embodiments of the present invention 4.

Figure 17 is the solid of the first mold (convex shape, is only applicable in unilateral side at crash forming) of embodiments of the present invention 4 Figure.

Figure 18 is the press-processing method of embodiments of the present invention 4 (convex shape, is only applicable in unilateral side at crash forming) Definition graph.

Figure 19 is the stereogram of the first mold (convex shape, draw forming) of embodiments of the present invention 5.

Figure 20 is the definition graph of the press-processing method (convex shape, draw forming) of embodiments of the present invention 5.

Figure 21 is the sectional view for indicating to apply the example of the formed products of the shape of product of the present invention.

Figure 22 A are other the figures for indicating to apply the formed products of the shape of product of the present invention.

Figure 22 B are the figures for indicating to apply the another example of the formed products of the shape of product of the present invention.

Figure 23 A are the definition graphs of the formed products (convex shape) of the shaped object of the embodiment of the present invention 1.

Figure 23 B are the sectional views of formed products shown in Figure 23 A.

Figure 24 A are the definition graphs of the formed products (lower convex form) of the shaped object of the embodiment of the present invention 2.

Figure 24 B are the sectional views of formed products shown in Figure 24 A.

Figure 25 is the explanation of the press-processing method (convex shape, draw forming, subsidiary liner) of the embodiment of the present invention 3 Figure.

Figure 26 is the definition graph of the previous diel (convex shape, draw forming) of the embodiment of the present invention 3.

Figure 27 is the definition graph of the previous press-processing method (convex shape, draw forming) of the embodiment of the present invention 3.

Figure 28 is the stereogram of first mold (lower convex form, draw forming) of the embodiment of the present invention 4.

Figure 29 is the definition graph of the previous diel (lower convex form, draw forming) of the embodiment of the present invention 4.

Figure 30 is the definition graph of the formed products (the inclined formed products of flange part) of the shaped object of the embodiment of the present invention 5.

Figure 31 is the explanation of the formed products (the different formed products of flange width) of the shaped object of the embodiment of the present invention 6 Figure.

Figure 32 is the solid of first mold (convex shape, is only applicable in central portion at draw forming) of the embodiment of the present invention 7 Figure.

Figure 33 is the stereogram as the convex formed products of the shaped object of the present invention.

Figure 34 is the stereogram of convex formed products under the shaped object as the present invention.

Figure 35 be the invention solves project definition graph, be the stereogram of previous diel (convex shape).

Figure 36 be the invention solves project definition graph, be the stereogram of previous diel (lower convex form).

Figure 37 be the invention solves project definition graph, be the definition graph of previous press-processing method.

Figure 38 A are the sectional views of the convex formed products shaped by previous press-processing method.

Figure 38 B are saying for the line length variation of the flange end before and after the forming of the convex formed products of previous press-processing method Bright figure.

Figure 39 A are the sectional views by convex formed products under previous press-processing method forming.

Figure 39 B are saying for the line length variation of the flange end before and after the forming of convex formed products under previous press-processing method Bright figure.

Figure 40 A be the invention solves project definition graph, be the convex formed products of previous press-processing method The definition graph of rebound.

Figure 40 B be the invention solves project definition graph, be convex formed products under previous press-processing method The definition graph of rebound.

Specific implementation mode

[embodiment 1]

Before illustrating the press-processing method of one embodiment of the present invention, illustrated as present invention side based on Figure 33 The formed products of the shaped object of method.The formed products of the object of press-processing method as embodiments of the present invention 1 such as Figure 33 Shown is convex formed products 121, which has the groove shape portion 123 extended along its length and in groove shape The flange part 125 of the both sides setting in portion 123, and so that the mode of axial central portion to the sides trench bottom 123a protrusion (convex) is curved It is bent.It should be noted that groove shape portion 123 is by trench bottom 123a and a pair of of the longitudinal wall part being arranged in the both sides of trench bottom 123a 123b is formed.

The press-processing method of the embodiment 1 of convex formed products 121 as described above through the invention shapes.The reality The press-processing method for applying mode 1 includes：First forming process shapes intermediate product (preformed part), the intermediate product tool There is the intermediate shape (preformed shape) of the line length variation of the bigger when flange part 125 is generated than being configured to shape of product； And second forming process, the intermediate product shaped using the first forming process are configured to the convex formed products as shape of product 121.Above-mentioned the first forming process and the second forming process uses different molds (the first mold 1 and the second mold 3) respectively Carry out it is stamping, therefore primarily with respect to the first mold 1 and the second mold 3, based on Fig. 1, Fig. 2A, Fig. 2 B, Fig. 3 A and Fig. 3 B into Row explanation.

(explanation of mold)

First mold 1 is mold used in the first forming process, has the first punch die (die) 5 and as shown in Figure 2 A One punch 7.

First punch die 5 has：The groove shape forming section 5a of first punch die side shapes convex formed products 121 (with reference to Figure 33) Groove shape portion 123；And first punch die side flange forming section 5b, be formed in the two of the groove shape forming section 5a of the first punch die side Side shapes the flange part 125 of convex formed products 121.

First punch 7 has：The groove shape forming section 7a of first punch side, the groove shape forming section 5a with the first punch die side Cooperate and formed the groove shape portion 123 of convex formed products 121；And first punch side flange forming section 7b, with the first punch die side Flange forming section 5b cooperation and shape the flange parts 125 of convex formed products 121.

The groove shape forming section 5a of the first punch die side and groove shape forming section 7a of the first punch side is the of the first mold 1 One groove shape forming section 9.The flange forming section 5b of the first punch die side and flange forming section 7b of the first punch side is the first mold 1 The first flange forming section 11.As shown in Figure 2 A and 2 B, 11 angulation of flexure plane 12 and the first flange forming section (with Under, referred to as " the first inclination angle alpha₁") it is set as defined size, the longitudinal wall that flexure plane 12 passes through the first groove shape forming section 9 Cross part 10 that forming section and the first flange forming section 11 intersect and with identical with the curvature of flange part 125 of cross part 10 Curvature.

Second mold 3 is the mold used in the second forming process, has the second punch die 13 and second as shown in Figure 3A Punch 15.

Second punch die 13 has：With the flute profile of the second punch die side of the groove shape forming section 5a same shapes of the first punch die side Shape forming section 13a；And the both sides of the groove shape forming section 13a of the second punch die side are formed in, and flange part 125 is configured to product The flange forming section 13b of second punch die side of shape.

Second punch 15 has：With the flute profile of the second punch side of the groove shape forming section 7a same shapes of the first punch side Shape forming section 15a；And it cooperates with the flange forming section 13b of the second punch die side and flange part 125 is configured to the of shape of product The flange forming section 15b of two punch sides.

The groove shape forming section 13a of the second punch die side and groove shape forming section 15a of the second punch side is the second mold 3 Second groove shape forming section 17.The flange forming section 13b of the second punch die side and flange forming section 15b of the second punch side is second Second flange forming section 19 of mold 3.As shown in Fig. 3 A and Fig. 3 B, 19 angulation of flexure plane 20 and the second flange forming section (hereinafter referred to as " the second inclination angle alpha₂") it is set as defined size, which passes through the second groove shape forming section 17 The cross part 18 that intersects with the second flange forming section 19 of longitudinal wall forming section and with the curvature with the flange part 125 of cross part 18 Identical curvature.As described above, the first groove shape forming section 9 and the second groove shape forming section 17 are same shape, therefore first The flexure plane 20 of the flexure plane 12 of mold 1 and the second mold 3 is same flexure plane.

It should be noted that in the following description, the first inclination angle alpha₁And second inclination angle alpha₂With above-mentioned bending It is negative from the flexure plane towards trench bottom side, opposite side is just on the basis of face (flexure plane 12 and flexure plane 20).As Fig. 2 B, Shown in Fig. 3 B, the second inclination angle alpha₂It is set to than the first inclination angle alpha₁Small (the first inclination angle alpha₁>Second angle of inclination α₂).It sets in this way, using the first mold 1, is shaped by blank and generated in larger line length variation in flange part 125 Between shape intermediate product, using the second mold 3, the intermediate product of intermediate shape can be configured to as shape of product it is convex at Shape product 121.It should be noted that about this point, it is described in detail below.

(press-processing method)

Action with the first mold 1 and the second mold 3 is illustrated based on Fig. 1 using the first mould described above constituted together The press-processing method of the present embodiment 1 of tool 1 and the second mold 3.

First forming process is using the first mold 1 that the blank 21 of convex formed products 121 is stamping for intermediate shape Intermediate product process.In first forming process, step a as shown in Figure 1 is such, and first, the first mold 1 is in the first punching Blank 21 is received between mould 5 and the first punch 7.In step a, blank 21 is loaded in the first punch 7.First punch die, 5 direction First punch 7 moves, close to the blank 21.

Next, the first mold 1 it is as shown in Figure 1 step b it is such, using the first punch die 5 and the first punch 7 by blank 21 The stamping intermediate product for intermediate shape.In step b, the first groove shape forming section 9 utilizes the flute profile of the first punch die side The shape forming section 5a and groove shape forming section 7a of the first punch side blank 21 is carried out it is stamping, thus the blank 21 formation Groove shape portion 123.It is accompanied by this, flange forming section 5b and first punch side of the first flange forming section 11 by the first punch die side Flange forming section 7b blank 21 is carried out it is stamping, thus the blank 21 formed flange part 125.

The first forming process in this way, blank 21 are formed to have above-mentioned groove shape portion 123 and flange part 125 Intermediate shape intermediate product.At this point, groove shape portion 123 be configured to using the first groove shape forming section 9 it is identical as shape of product Shape, and flange part 125 relative to flexure plane 12 (with reference to Fig. 2A, Fig. 2 B) angle of inclination utilize the first flange forming section 11 are configured to the first inclination angle alpha₁。

Second forming process is to use the second mold 3 by the intermediate product of the intermediate shape based on the first above-mentioned forming process The process of the stamping convex formed products 121 for shape of product.In second forming process, step c as shown in Figure 1 that Sample, the second mold 3 are received between the second punch die 13 and the second punch 15 by the intermediate product of above-mentioned the first forming process generation That is the convex formed products 121 of intermediate shape.In step c, the convex formed products of intermediate shape are loaded in the second punch 15 121.Second punch die 13 is moved towards the second punch 15, close to the convex formed products 121 of the intermediate shape.

Next, the second mold 3 it is as shown in Figure 1 step d it is such, will be intermediate using the second punch die 13 and the second punch 15 The stamping convex formed products 121 for shape of product of convex formed products 121 of shape.In step d, the second groove shape at Shape portion 17 is by the groove shape forming section 13a of the second punch die side and the groove shape forming section 15a of the second punch side to intermediate shape Convex formed products 121 carry out stamping, thus the groove shape portion 123 of the convex formed products 121 is configured to slot bottom The groove shape portion 123 of the shape of product of portion 123a and longitudinal wall part 123b.It is accompanied by this, the second flange forming section 19 passes through the second punching The flange forming section 13b of mould side and the flange forming section 15b of the second punch side rush the convex formed products 121 of intermediate shape Thus the flange part 125 of the convex formed products 121 is configured to have the second inclination angle alpha by pressing formation₂Flange part 125.

The second forming process in this way, convex formed products 121 are configured to shape of product by above-mentioned intermediate shape.This When, groove shape portion 123 is clamped by the second groove shape forming section 17, and flange part 125 relative to flexure plane 20 (with reference to Fig. 3 A, Fig. 3 B) angle of inclination be configured to and the second inclination angle alpha using the second flange forming section 19₂Identical angle of inclination.

About the mechanism of above such the method for the present invention, it is conceived to end (the i.e. flange end of the flange part 125 in forming Portion) line length variation, illustrated based on Fig. 4 A, Fig. 4 B, Fig. 5 A and Fig. 5 B.

Fig. 4 A be the first forming process lower dead center (the first lower dead center) and the second forming process lower dead center (second time only Point) at convex formed products 121 sectional view.Fig. 4 B are the blanks indicated when blank 21 (convex formed products 121) are observed in side view Hold the figure of the line length variation of (flange end).

In Figure 4 A, the flange part 125 of the first lower dead center is represented by the dotted line, and the flange part 125 of the second lower dead center is by solid line It indicates, the flange part 125 of the first lower dead center only illustrates unilateral side.In Figure 4 A, the inclination angle of the flange part 125 of the first lower dead center Degree becomes the first inclination angle alpha₁, the angle of inclination of the flange part 125 of the second lower dead center becomes the second inclination angle alpha₂.In Fig. 4 A In, the center of curvature for the cross part that longitudinal wall part 123b intersects with flange part 125 is set as O₀, radius of curvature is set as ρ₀[mm].Under first The center of curvature of flange end at stop is set as O₁, radius of curvature is set as ρ₁[mm].In the curvature of flange end at second lower dead center The heart is set as O₂, radius of curvature is set as ρ₂The flange width of [mm], shape of product are set as L [mm].On the other hand, in figure 4b, shape The line length at preceding blank end is indicated that the line length of the flange end of the first lower dead center is represented by the dotted line by fine line, the second lower dead center The line length of flange end is indicated by heavy line.

Fig. 5 A are the stress-strain line charts of the relationship for the stress and strain for indicating to generate in flange part 125 in formation (stress-strain curve).In the stress-strain line chart, the longitudinal axis indicates that stress σ, horizontal axis indicate strain stress.Moreover, In Fig. 5 A, stress value is that positive situation indicates that tensile stress, stress value are that negative situation indicates compression stress.Fig. 5 B are to indicate figure Gradient (slope (gradient) d σ/d of the stress of the variable quantity of strain and the variable quantity relative to the strain of the coordinate diagram of 5A Coordinate diagram ε).In the coordinate diagram shown in Fig. 5 B, horizontal axis indicate strain stress, the longitudinal axis indicate stress relative to strain slope d σ/ dε。

The form of the line length variation of flange part 125 in forming is in the first inclination angle alpha₁>Second inclination angle alpha₂Shi Yu One inclination angle alpha₁<Second inclination angle alpha₂Shi Butong, therefore illustrate the first inclination angle alpha first₁>Second inclination angle alpha₂When Press-processing method mechanism.

In the first inclination angle alpha₁>Second inclination angle alpha₂In the case of, the line length of the length direction of flange part 125 is Shorten (A in one forming process as shown in Figure 4 B₀B₀→A₁B₁).Flange part 125 bears compression strain as shown in Figure 5A as a result,.So Afterwards, in the second forming process, as shown in Figure 4 B, the slightly elongated (A of line length of the length direction of flange part 125₁B₁→A₂B₂).By This, as shown in Figure 5A, in the first forming process, the compression strain that flange part 125 is born is to tensile side (from the first lower dead center Rise) return to strain back amount Δ ε.As a result, the compression stress assigned to flange part 125 in the first forming process is significantly It reduces.In this example embodiment, as shown in Figure 5A, the stress σ for remaining on flange part 125 switchs to tensile stress from compression stress.

In this way, present invention utilizes the return relative to small strain and the feature that varies widely of stress sensitive ground.This The press-processing method of the embodiment 1 of invention is in the convex formed products 121 of formed product shape, in the first forming process In, flange line length is temporarily carried out than the forming that shape of product shortens, and then, in the second forming process, into exercising, bead wire is long Slightly elongated forming.As a result, at flange part 125, the line length of the length direction generated in the first forming process is made to shrink Compression strain is returned by using the second forming process for applying the deformation for making line length slightly extend.It is accompanied by this, flange part 125 Compression stress reduce.As a result, the residual stress of flange part 125 reduces, thus rebound reduces.

The radius of curvature ρ of flange end at first lower dead center shown in Fig. 4 A₁And the song of the second flange end at lower dead center Rate radius ρ₂It is indicated by following formula (3) and formula (4).Above-mentioned strain back amount Δ ε uses above-mentioned radius of curvature ρ₁、ρ₂And curvature Variation delta the ρ (=ρ of radius₂-ρ₁), it is indicated by following formula (5).

[mathematical expression 3]

ρ₁=ρ₀-L sinα₁…(3)

ρ₂=ρ₀-L sinα₂…(4)

[mathematical expression 4]

It should be noted that Δ ε>0.

It should be noted that utilizing the first inclination angle alpha₁When being arranged to formula (5), the first inclination angle alpha₁By following formula (6) it indicates.

[mathematical expression 5]

It is above-mentioned to illustrate the first inclination angle alpha as shown in Figure 4 A₁And second inclination angle alpha₂All it is the stamping side of timing The mechanism of method.However, it is not limited to this, as shown in Figure 6A, even if in the first inclination angle alpha₁For just and the second inclination angle alpha₂ When being negative, the first inclination angle alpha₁And second inclination angle alpha₂When being all negative, as long as the first inclination angle alpha₁>Second angle of inclination α₂, then the line length variation of flange part 125 is just for example as described above shown in Fig. 6 B.Therefore, punching according to embodiment 1 of the present invention Pressing formation method can obtain the reducing effect of the compression stress of flange part 125.As long as moreover, the first inclination angle alpha₁>Second inclines Rake angle α₂, can be the first inclination angle alpha₁=0 [°] can also be the second inclination angle alpha₂=0 [°] (shape of product Flange part 125 do not tilted relative to flexure plane 20).

On the other hand, in the first inclination angle alpha as comparative example relative to the present invention₁<Second inclination angle alpha₂Feelings Under condition, as shown in Figure 7 B, shorten (A in the line length of the length direction of the first forming process convexity edge 125₀B₀→A₁B₁).By This, flange part 125 bears compression strain.Then, when the second forming process convexity edge 125 is configured to shape of product, flange The line length of the length direction in portion 125 further shortens (A as shown in Figure 7 B₁B₁→A₂B₂).The flange part 125 being shaped so as to as a result, There is no the return of strain stress, thus, it is unable to get the reducing effect for the compression stress for remaining on flange part 125.As a result, returning Bullet will not reduce.

Above-mentioned comparative example illustrates the first inclination angle alpha as shown in Figure 7 A₁For negative and the second inclination angle alpha₂For timing The mechanism of press-processing method.However, no matter the first inclination angle alpha₁And second inclination angle alpha₂It is positive and negative how, even if for example First inclination angle alpha₁And second inclination angle alpha₂All be just in the case of, as long as the first inclination angle alpha₁<Second angle of inclination α₂, the residual stress of flange part 125 would not reduce, thus to be equally rebound will not reduce such result.

It should be noted that each structure and each element are in addition to the first angle of inclination shown in Fig. 6 A, Fig. 6 B, Fig. 7 A, Fig. 7 B α₁And second inclination angle alpha₂Each size, other than magnitude relationship difference, it is identical as the situation shown in Fig. 4 A, Fig. 4 B.Above-mentioned In each attached drawing, same label is marked for same composition part.

Next, about the first inclination angle alpha₁Preferred scope, based on indicating that Fig. 5 B of slope d σ/d ε are studied, Therefore following to be described.

As shown in Figure 5 B, in the small regions the strain back amount Δ ε from the first lower dead center, slope d σ/d ε are big, but It strains in the big regions back amount Δ ε, slope d σ/d ε become smaller.It follows that in the small regions strain back amount Δ ε, and answer The variable quantity for becoming the opposite stress σ of variable quantity of ε increases, in the big regions strain back amount Δ ε, the variable quantity with strain stress The variable quantity of opposite stress σ reduces.In the big regions strain back amount Δ ε, even if strain stress is made to change, with its variable quantity The variable quantity of opposite stress σ is also small, thus, so that the effect that rebound changes is become smaller.

On the other hand, if increasing the first inclination angle alpha₁, then it is used to make the second of the return shape of product of flange part 125 to incline Rake angle α₂Also increase, be accompanied by this, strain back amount Δ ε becomes larger.In the case where strain back amount Δ ε is big, at the first one-tenth The compressive strain of flange part 125 in shape process increases, therefore may will produce fold in flange part 125.Therefore, in order to make Rebound variation and effectively and the strain back amount Δ ε of fold of flange part 125 can be inhibited there are upper limit values.If by the upper limit Value is set as Δ ε_max, then the range of back amount Δ ε is strained by following formula (7) expression.

[mathematical expression 6]

0 ＜ Δs ε≤Δ ε_max…(7)

By formula (7) substitution formula (6) and for the first inclination angle alpha₁On the basis of being arranged, flange in order to obtain The reducing effect of the compression stress in portion 125 and consider the first inclination angle alpha₁>Second inclination angle alpha₂The case where when, first tilt Angle [alpha]₁Range by following formula (1) indicate.

[mathematical expression 7]

For example, when the fold for experimentally finding out flange part 125 generates the limit, by the Young's modulus of blank 21 (Young ' s modulus) is set as E [MPa], and the tensile strength of blank 21 is set as σ_TS[MPa], and strain the upper of back amount Δ ε Limit Δ ε_maxBy 4 σ_TS/ E is assigned.

As previously discussed, in present embodiment 1, when shaping convex formed products 121, in the first forming process, temporarily Shi Jinhang flanges line length is than the forming that shape of product shortens, in the second forming process, into exercise bead wire length slightly extend at Shape.As a result, at flange part 125, the strain generated in the first forming process slightly returns in the second forming process, with This, the compression stress of flange part 125 reduces, therefore the result is that the residual stress of flange part 125 reduces, thus rebound reduces.And And by by the first inclination angle alpha₁It is adjusted in the range of formula (1), fold can not be generated in flange part 125 and controlled Springback capacity processed.

[embodiment 2]

Next, illustrating embodiments of the present invention 2.In above-mentioned embodiment 1, illustrate axial central portion to The stamping of the convex formed products 121 (with reference to Figure 33) of (convex) shape is protruded in the sides trench bottom 123a, but in this embodiment party In formula 2, convex formed products under such axial central portion shown in definition graph 34 is recessed (under convex) shape to the sides trench bottom 123a 127 it is stamping.

Under convex formed products 127 using the first mold 23 (with reference to Fig. 8 A) being made of the first punch die 25 and the first punch 27 and Second mold 29 (with reference to Fig. 9 A) progress being made of the second punch die 31 and the second punch 33 is stamping.First mold 23 and Two molds 29 are compared with the first mold 1 of embodiment 1 and the second mold 3 (with reference to Fig. 2A and Fig. 3 A), in addition to the direction of bending It is all identical other than different.Specifically, in the first punch die 25, the groove shape forming section 25a and the first punch die of the first punch die side The flange forming section 25b of side is other than the direction difference of bending, the groove shape forming section with the first punch die side of embodiment 1 The flange forming section 5b difference of 5a and the first punch die side is identical.In the first punch 27, the groove shape forming section of the first punch side 27a and the flange forming section 27b of the first punch side are other than the direction difference of bending, the first punch side with embodiment 1 Groove shape forming section 7a and the first punch side flange forming section 7b difference it is identical.Moreover, in the second punch die 31, the second punching The groove shape forming section 31a of mould side and the flange forming section 31b of the second punch die side are other than the direction difference of bending, with implementation The groove shape forming section 13a of second punch die side of mode 1 and the flange forming section 13b difference of the second punch die side are identical.Second In punch 33, the direction of the flange forming section 33b of the groove shape forming section 33a of the second punch side and the second punch side in addition to bending Other than difference, with the groove shape forming section 15a of the second punch side of the embodiment 1 and flange forming section 15b of the second punch side It is identical respectively.In Fig. 8 A and Fig. 9 A, about structure same as Fig. 2A and Fig. 3 A, same label is marked.Moreover, in conduct Fig. 8 B of the sectional view of first mold 23 shown in Fig. 8 A and as in Fig. 9 B of the sectional view of the second mold 29 shown in Fig. 9 A, About structure identical with Fig. 2 B and Fig. 3 B, same label is marked.

Under convex formed products 127 with convex formed products 121 of embodiment 1 the case where compared with, the line length of flange part 125 changes Form it is different, therefore be conceived to this point, the mechanism of the press-processing method about embodiment 2, based on Figure 10 A, figure 10B, Figure 11 A and Figure 11 B are illustrated.Figure 10 A, Figure 10 B, Figure 11 A and Figure 11 B are striking out for embodiments of the present invention 2 The definition graph of the mechanism of shape method.In Figure 10 A and Figure 10 B, about structure same as Fig. 4 A and Fig. 4 B, same mark is marked Number.

In the first inclination angle alpha₁>Second inclination angle alpha₂When, as shown in Figure 10 B, in the first forming process, flange part Elongated (the C of line length of 125 length direction₀D₀→C₁D₁).Flange part 125 generates elongation strain as shown in Figure 11 A as a result,.So Afterwards, in the second forming process, as shown in Figure 10 B, the line length of the length direction of flange part 125 slightly shortens (C₁D₁→C₂D₂).By This, as shown in Figure 11 A, in the first forming process flange part 125 generate elongation strain to compressed side (from the first lower dead center Rise) return to strain back amount Δ ε.As a result, the tensile stress assigned to flange part 125 in the first forming process reduces. In the example shown in Figure 11 A, the stress σ for remaining on flange part 125 is changed into compression stress from tensile stress.

In the press-processing method of such embodiment 2, the song of the flange end at the first lower dead center shown in Figure 10 A Rate radius ρ₁And the radius of curvature ρ of the second flange end at lower dead center₂Use the first inclination angle alpha₁And second inclination angle alpha₂Table When showing, as following formula (8) and formula (9).

[mathematical expression 8]

ρ₁=ρ₀+L sinα₁…(8)

ρ₂=ρ₀+L sinα₂…(9)

The strain back amount Δ ε assigned to flange part 125 in the second forming process uses the variation delta ρ of radius of curvature (=ρ₁-ρ₂), it is indicated by following formula (10).

[mathematical expression 9]

It should be noted that Δ ε>0.

First inclination angle alpha as a result,₁It is indicated by following formula (11).

[mathematical expression 10]

It should be noted that foregoing describe the first inclination angle alphas as shown in Figure 10 A₁And second inclination angle alpha₂All it is just When press-processing method mechanism.However, it is not limited to this, even if the first inclination angle alpha as illustrated in fig. 12₁For just and Second inclination angle alpha₂When being negative, the first inclination angle alpha₁And second inclination angle alpha₂When being all negative, as long as the first inclination angle alpha₁ >Second inclination angle alpha₂, then flange part 125 line length variation form just with for example shown in Figure 12 B it is identical.Therefore, according to this The press-processing method of the embodiment 2 of invention, can obtain the reducing effect of the tensile stress of flange part 125.Moreover, with implementation The case where mode 1, is same, as long as the first inclination angle alpha₁>Second inclination angle alpha₂, can also be the first inclination angle alpha₁= 0 [°] can also be the second inclination angle alpha₂=0 [°] (flange part 125 of shape of product does not tilt relative to flexure plane 20).

On the other hand, the first inclination angle alpha as the comparative example relative to the present invention₁<Second inclination angle alpha₂When, such as Shown in Figure 13 B, in the first forming process, the elongated (C of line length of the length direction of flange part 125₀D₀→C₁D₁).Flange as a result, Bear elongation strain in portion 125.Then, in the second forming process, when flange part 125 is shaped as shape of product, flange part 125 The line length of length direction be further elongated (C as shown in Figure 13 B₁D₁→C₂D₂).Do not have as a result, in the flange part 125 being shaped so as to There is the return of strain stress, thus, it is unable to get the reducing effect for the tensile stress for remaining on flange part 125.As a result, also Less than the reducing effect of rebound.About this point, it is not only the first inclination angle alpha as shown in FIG. 13A₁For negative and the second inclination angle Spend α₂For positive situation, even if in the first inclination angle alpha₁And second inclination angle alpha₂All it is positive situation, the first inclination angle alpha₁ And second inclination angle alpha₂In the case of being all negative, as long as the first inclination angle alpha₁<Second inclination angle alpha₂It is just same.

It should be noted that each structure and each element shown in Figure 12 A, Figure 12 B, Figure 13 A, Figure 13 B are tilted in addition to first Angle [alpha]₁And second inclination angle alpha₂Each size, other than magnitude relationship difference, it is identical as the situation shown in Figure 10 A, Figure 10 B. In these each attached drawings, same label is marked about same composition part.

Next, the case where with embodiment 1, is same, about the first inclination angle alpha₁Preferred scope, answered based on stress- The slope d σ/d ε (1B referring to Fig.1) for becoming line chart are studied, therefore are described below.

As shown in Figure 11 B, with embodiment 1 the case where, is same, small in the strain back amount Δ ε from the first lower dead center In region, slope d σ/d ε are big, but in the big regions strain back amount Δ ε, slope d σ/d ε become smaller.That is, being returned in strain It measures in the small regions Δ ε, the variable quantity of opposite stress σ increases with the variation of strain stress, in the big regions strain back amount Δ ε In, the variable quantity of opposite stress σ reduces with the variation of strain stress.In the big regions strain back amount Δ ε, even if making strain stress Variation, the variable quantity of the stress σ opposite with its variable quantity is also small, thus, so that the effect that rebound changes is reduced.

On the other hand, by increasing the first inclination angle alpha₁, tilted for making flange part 125 return to the second of shape of product Angle [alpha]₂It also becomes larger, is accompanied by this, strain back amount Δ ε increases.In the case where strain back amount Δ ε is larger, the first forming The elongation strain amount of flange part 125 in process increases, therefore may will produce rupture (fracture) in flange part 125.And And in the case where strain back amount Δ ε is big, fold may be will produce in the second forming process convexity edge 125.Therefore, it is Effectively change rebound and the rupture of flange part 125 can be inhibited, there are upper limit values the strain back amount Δ ε of fold.It will The upper limit value is set as Δ ε_maxWhen, the range of strain back amount Δ ε with the case where embodiment 1 in the same manner as by following formula (7) expression.

[mathematical expression 11]

0 ＜ Δs ε≤Δ ε_max…(7)

As described above, the reducing effect of the tensile stress of flange part 125 in order to obtain, with the first inclination angle alpha₁>Second Inclination angle alpha₂Premised on, pass through the premise and above formula (7) and formula (11), the first inclination angle alpha₁Range by following formula (2) table Show.

[mathematical expression 12]

It should be noted that if increasing the first inclination angle alpha₁, then be used to that flange part 125 to be made to return to shape of product the Two inclination angle alphas₂Also increase, be accompanied by this, strain back amount Δ ε increases.In the case where strain back amount Δ ε is big, second The compressive strain of flange part 125 in forming process increases, and may will produce fold in flange part 125.For example, experimental When the fold that ground finds out flange part 125 generates the limit, the Young's modulus of blank 21 is set as E [MPa], the tension of blank 21 is strong Degree is set as σ_TS[MPa] can inhibit the upper limit value Δ ε of the strain back amount Δ ε of the fold of such flange part 125_maxBy 4 σ_TS/ E is assigned.

As previously discussed, in present embodiment 2, under forming when convex formed products 127, in the first forming process, temporarily The line length of Shi Jinhang flange parts 125 is than the forming that shape of product increases, and into enforcement, the line length slightly shortens in the second forming process Forming.As a result, at flange part 125, the elongation strain generated in the first forming process is slightly returned in the second forming process It returns, is accompanied by this, the tensile stress of flange part 125 reduces.As a result, the residual stress of flange part 125 reduces, thus spring back It reduces.Moreover, by by the first inclination angle alpha₁It is adjusted in the range of formula (2), and not will produce brokenly in flange part 125 It splits, fold, springback capacity can be controlled.

[embodiment 3]

Next, illustrating embodiments of the present invention 3.In above-mentioned embodiment 1 and embodiment 2, explanation is enumerated The example that first mold is made of the first punch die and the first punch, but can also as being illustrated present embodiment 3 from Liner pressing blank is utilized from when one forming process starts.Blank to be reliably prevented from the first forming process inclined as a result, The case where shifting.

As an example of such mold using liner, the first mold 35 of present embodiment 3 rushes shown in Figure 14 It is illustrated in step a, b of pressing formation method.First punch die 37 of the first mold 35 is other than the point with liner 39, with Fig. 1 Shown in press-processing method step a, b and Fig. 2A diagram the first mold 1 the first punch die 5 it is identical.Therefore, in fig. 14 Step a, b in, about part of first mold 35 other than liner 39, mark and step a, b and Fig. 2A phases in Fig. 1 Same label.Liner 39 is disposed relative to the first punch die 37 and can expose submerge, and cooperates with the first punch 7 and blank 21 is clamped The position for being equivalent to trench bottom.It should be noted that step c, d of the second forming process in present embodiment 3 is (with reference to figure 14) same as embodiment 1 in, using same second mold 3 with shown in Fig. 3 A, by the convex formed products 121 of intermediate shape Stamping (intermediate product) are shape of product.

It should be noted that foregoing describe the stamping of convex formed products 121, but in present embodiment 3, close The stamping of convex formed products 127 can similarly use attached padded first mold under.

[embodiment 4]

Next, illustrating embodiments of the present invention 4.In above-mentioned 1~embodiment of embodiment 3, illustrate Apply the example of the return of strain at the flange part 125 of two sides of a pair of of longitudinal wall part 123b, but can also be such as present embodiment 4 It illustrates and carries out like that only for being shaped as the return of the flange part 125 of side application strain.

Formed products 41 shown in the sectional view of the press-processing method of present embodiment 4 such as Figure 15 are such, in forming two It is effective when the structure of different size of the flange part 125 of side.Using common crash forming come when shaping formed products 41, two Side flange part 125 it is of different size, therefore at lower dead center accumulation in flange part 125 residual stress (formed products 41 be it is upper It is compression stress in the case of convex form) it is different between two flanges 125.As cause, the torque of formed products 41 is acted on (moment) balance is destroyed, as a result, after demoulding, torsional deflection as shown in Figure 16 is generated in formed products 41. It should be noted that in figure 16, the shape before the demoulding of formed products 41 is represented by the dotted line, the shape after demoulding is by solid line table Show.Therefore, the press-processing method of present embodiment 4 is to obtain the balance of the residual stress of the flange part 125 of two sides, for The flange part 125 of one side carries out the such forming of return of the imparting strain proposed in the present invention.

The one of the mold used in the first forming process of present embodiment 4 to carry out such forming for example schemes Shown in 17.First mold 43 shown in Figure 17 is changed shown in step a, b and Fig. 2A of press-processing method shown in FIG. 1 The example of a part for first mold 1 marks same label for part identical with the first mold 1 in fig. 17.First mould Tool 43, can be only long by the flange width in the flange part 125 (referring to Fig.1 5) of two sides of formed products 41 at the first lower dead center The flange part 125 of a side be configured to the first inclination angle alpha₁.That is, as shown in figure 17, the first mold 43 has：First punch die 45, the flange forming section 5b of the first punch die side is only equipped in the unilateral side of the groove shape forming section 5a of the first punch die side；And first punching First 47, the flange forming section 7b of the first punch side is only equipped in the unilateral side of the groove shape forming section 7a of the first punch side.It needs It is bright, in the second forming process of present embodiment 4, using second mold 3 same as embodiment 1 (in referring to Fig.1 Step c, d and Fig. 3 A), by the convex formed products 121 (intermediate product) of intermediate shape it is stamping be shape of product.

About the above-mentioned press-processing method for having used the first mold 43 and the second mold 3, that is, present embodiment 4 Press-processing method is illustrated based on Figure 18.As shown in figure 18, the press-processing method of present embodiment 4 carries out successively Blank 21, is configured to the convex formed products of shape of product by one forming process (step a, b) and the second forming process (step c, d) 121。

That is, in the first forming process, step a, b as shown in figure 18 is such, the first mold 43 the first punch die 45 with Blank 21 is received between first punch 47, it is using the first punch die 45 and the first punch 47 that the blank 21 is stamping for intermediate shape The convex formed products 121 (intermediate product) of shape.At this point, groove shape forming section of the first groove shape forming section 9 by the first punch die side The 5a and groove shape forming section 7a of the first punch side carries out blank 21 stamping, thus forms groove shape on the blank 21 Portion 123 (referring to Fig.1 5).It is accompanied by this, the first flange forming section 11 utilizes the punchings of the flange forming section 5b of the first punch die side and first The flange forming section 7b of rostral carries out blank 21 stamping, and the different a pair of flange width is thus formed on the blank 21 Flange part 125 (referring to Fig.1 5).

The first forming process in this way, blank 21 are formed to have above-mentioned groove shape portion 123 and flange width The convex formed products 121 (intermediate product) of the intermediate shape in different a pair of flanges portions 125.At this point, the first mold 43 uses unilateral side The first flange forming section 11, only by the flange part 125 of the wide side of the flange width in a pair of flanges portion 125 with its inclination angle Degree becomes and the first inclination angle alpha₁The mode of identical angle shapes.

Then, in the second forming process, step c, d as shown in figure 18 is such, and the second mold 3 is by above-mentioned by first The convex formed products 121 for the intermediate shape that forming process generates are configured to the structure of shape of product.At this point, the second flange forming section The wide flange part 125 of above-mentioned flange width is configured to shape of product by 19.

In the lower dead center of second forming process, that is, at the second lower dead center, the strain of the wide flange part 125 of flange width It returns, as a result, being reduced in the wide 125 remaining compression stress of flange part of flange width.At this point, using existing method into In the case of row, it can be reduced and more be accumulated in the wide flange of flange width by the second forming process of present embodiment 4 The residual stress in portion 125.It is wide in flange thereby, it is possible to obtain the residual stress of the wide flange part 125 of the flange width and accumulation Spend the balance of the residual stress of narrow flange part 125.It is acted on the formed products 41 at the second lower dead center as a result, can obtain Torque balance, therefore can reduce demoulding after formed products 41 (being in figure 18 convex formed products 121) torsional deflection.

It should be noted that among the above, shows to the flange part 125 of the wide side of flange width and assign returning for strain Such example shaped is returned, but in present embodiment 4, as long as the balance in the acquirement torque of flange part 125 of two sides is It can.That is, the stamping of embodiments of the present invention 4 can also be implemented depending on the situation to the narrow side of flange width, It can also implement to the flange part 125 of two sides.Moreover, no matter formed products are convex-shaped to the press-processing method of present embodiment 4 Which of shape or lower convex form can be applicable in.

[embodiment 5]

Next, illustrating embodiments of the present invention 5.In above-mentioned 1~embodiment of embodiment 4, show logical It crosses crash forming and carries out the example of the first forming process, but draw forming can also be passed through as illustrating present embodiment 5 Carry out the first forming process.

In the first forming process of present embodiment 5, in order to carry out draw forming, use example it is as shown in figure 19 first Mold 49.First mold 49 shown in Figure 19 is changed shown in step a, b and Fig. 2A of press-processing method shown in FIG. 1 The structure of a part for first mold 1 marks same label in Figure 19 for part identical with the first mold 1.

First mold 49 is the structure for shaping convex formed products 121, as shown in figure 19, by punch die 51, punch 53, base Expect that holder 55 is constituted.In present embodiment 5, the first groove shape forming section 9 utilizes groove shape forming section (the first punching of punch die 51 The groove shape forming section 5a of mould side) and punch 53 groove shape forming section (the groove shape forming section 7a of the first punch side) realize. First flange forming section 11 utilizes the flange forming section (the flange forming section 5b of the first punch die side) and charge support 55 of punch die 51 Flange forming section (the flange forming section 7b of the first punch side) realize.The of first flange forming section 11 of present embodiment 5 One inclination angle alpha₁It is set as the first inclination angle alpha with the first mold 1 of embodiment 1 shown in Fig. 2 B₁Identical angle.

Punch die 51 can utilize the knot with first punch die 5 (with reference to Fig. 2A) same shape of the first mold 1 of embodiment 1 Structure.Punch 53, which is disposed relative to charge support 55, individually to be acted.The top of punch 53 constitutes the slot of the first punch side Shape formable portion 7a is formed by being inserted in the groove shape forming section (the groove shape forming section 5a of the first punch die side) of punch die 51 Shape goes out the groove shape portion 123 of convex formed products 121.Charge support 55 is arranged in the both sides of punch 53, is cooperated with punch die 51 to press from both sides Blank 21 is held, and shapes the flange part 125 of convex formed products 121.

It should be noted that in the first forming process and the second forming process of the press-processing method of present embodiment 5 In the second forming process in, using second mold same as embodiment 13 (step c, d in referring to Fig.1 and Fig. 3 A), The convex formed products 121 of intermediate shape are stamping for shape of product.

Hereinafter, about first formings different from above-mentioned embodiment 1 in the press-processing method of present embodiment 5 Process, that is, the first forming process for having used the first mold 49 is illustrated based on Figure 20.

In the first forming process of present embodiment 5, step a as shown in figure 20 is such, and first, the first mold 49 exists Blank 21 is received between punch die 51 and charge support 55.In step a, blank 21 is loaded in the upper surface of punch 53.It connects down Come, the first mold 49 step b as shown in figure 20 utilizes punch die 51 and charge support 55 that blank 21 is clamped like that.In step b In, charge support 55 between the flange forming section 7b of the flange forming section 5b of the first punch die side and the first punch side to be clamped base The mode of material 21, cooperates with punch die 51 blank 21 is clamped.

Next, step c as shown in figure 20 is such, the first mold 49 is by punch 53 to by punch die 51 and charge support The blank 21 of the state of 55 clampings carries out stamping.In step c, the blank for the state that punch 53 makes this clamped on one side The 21 groove shape forming section 5a towards the first punch die side is moved up, and is carried out on one side stamping.Next, as shown in figure 20 Step d is such, and blank 21 is configured to the convex of intermediate shape by the first mold 49 using punch die 51, punch 53, charge support 55 Formed products 121.In step d, punch 53 continues to make on one side the groove shape forming section 7a of the first punch side close to The groove shape forming section 5a's of one punch die side moves up, blank 21 is carried out using the first groove shape forming section 9 on one side it is stamping, Shape the groove shape portion 123 in the convex formed products 121 of intermediate shape as a result, (with reference to Figure 33).At the same time, punch die 51 and Charge support 55 maintains to utilize the first flange forming section 11 (the flange forming section 5b of the first punch die side and the flange of the first punch side Forming section 7b) state of blank 21 is clamped, the flange part of the both sides in the convex formed products 121 of intermediate shape is shaped as a result, 125 (with reference to Figure 33).

The intermediate shape of the convex formed products 121 when the first mold 49 progress draw forming is used in this way and uses the first mould Come the intermediate shape of the convex formed products 121 when shaping (referring to Fig.1), there are a little differences by crash forming for tool 1.However, the First inclination angle alpha of the first flange forming section 11 of one mold 49₁It is set as angle identical with the first mold 1, therefore with The case where shaping convex formed products 121 using the first mold 1 is same, the strain of the flange part 125 in the second forming process Returning to effect can also obtain in present embodiment 5.

It should be noted that the shape of product of the formed products as the effect for obtaining the present invention, as long as with to become It is convex or under the flange part that is bent of convex mode, and at least one party in a pair of of the longitudinal wall part for forming groove shape portion have it is described The shape of flange part.Figure 21 shows the multiple examples that can be applicable in the section of the shape of product of the formed products of the present invention, closes It is described below in each section.

As shown in figure 21, the shape of product (cross sectional shape) of the formed products of the present invention can be applicable according to the flange of formed products Each structure of portion and longitudinal wall part and be divided into 9 type T1~T9.Type T1~T6 in these types T1~T9 is in longitudinal wall part Two sides have flange part formed products shape of product.Type T1, T4 in these types T1~T6 is that longitudinal wall part is vertical The shape of product of formed products.Type T2, T5 and above-mentioned formed products (convex formed products 121, under convex formed products 127) are equally vertical The inclined shape of product of wall portion.Type T3, T6 is that two longitudinal wall parts tilt and do not have flat part (flat portion) at top The shape of product of formed products.In order to shape type T3, T6 shape of product section, front end can be used to become curved surface and being rushed Head.On the other hand, type T7~T9 in 9 type T1~T9 shown in Figure 21 is only in a pair of of the longitudinal wall for constituting groove shape portion The shape of product of either one formed products with flange part in portion.

In addition, can be applicable in the present invention formed products shape of product as shown in the example of Figure 22 A and Figure 22 B, Ke Yishi The only shape of product of the formed products 61 of flange part upward convex direction bending, can also be the only downward convex direction bending of flange part at The shape of product of shape product 63.It should be noted that the product shape of formed products shown in any of Figure 21, Figure 22 A and Figure 22 B Shape, that is, the shape of product that can be applicable in the formed products of the present invention is not limited by the width of flange part, length, height and position.And And the mutual width of flange part of left and right, length can also be different.

Among the above, list the second forming process make the second punch die move down and close to the example of the second punch, still The present invention is not limited to this.In the second forming process of the present invention, as long as the second punch is relatively close to the second punch die , either one movement can be made, the second punch can also be made close to the second punch die.

It, can also be by the replacement up and down of the first punch die of the first mold and the first punch, or by addition, among the above The replacement up and down of the second punch die and the second punch of two molds, or by the first punch die of the first mold and the first punch up and down It replaces and by the replacement up and down of the second punch die of the second mold and the second punch.Either it is therein which can similarly obtain To the effect of the present invention.

In addition, among the above, the example for the mold that punch die can move up and down is listed, but the moving direction of mold is simultaneously It is not limited to upper and lower directions, for example, it is also possible to make punch die and punch laterally to make at least one party in above-mentioned punch die and punch Transverse shifting.

In addition, among the above, enumerates and illustrate that the first groove shape forming section and the second groove shape forming section are same shape When example, but the first groove shape forming section and the second groove shape forming section may be different shapes.Alternatively, can also Flanging muscle is set in the first groove shape forming section, and the flanging muscle is flattened using the second groove shape forming section.

In addition, above-mentioned explanation be to the flange part of bending be set to formed products in an axial part for formed products into The explanation of the stamping press-processing method of row, and be the first inclination angle alpha of the first mold and the second mold₁Incline with second Rake angle α₂Relationship be set as the first inclination angle alpha in the overall length of the first mold and the second mold₁>Second inclination angle alpha₂ Press-processing method explanation.However, the invention is not limited in such situation, the first above-mentioned inclination angle alpha₁With Two inclination angle alphas₂Relationship can also be only in the first mold and the second mold the portion that is formed of the flange part to bending Position is set as the first inclination angle alpha₁>Second inclination angle alpha₂(with reference to aftermentioned embodiment 7 and Figure 32).

In addition, above-mentioned explanation be to the flange part of bending be set to formed products in an axial part for formed products into The explanation of the stamping press-processing method of row, but be not limited to that this, is shaping about the flange part setting to bending Formed products in the entire axial length of product carry out stamping situation, and the present invention can also be applied.In this case, it first tilts Angle [alpha]₁With the second inclination angle alpha₂Relationship can be only in the first mold and the second mold to the flange part of bending carry out at The position of shape is set as the first inclination angle alpha₁>Second inclination angle alpha₂, or the first inclination angle can also be set as in overall length Spend α₁>Second inclination angle alpha₂。

Embodiment 1

Next, illustrating the embodiment of the present invention 1.In embodiment 1, it has carried out for confirming that the present invention's is stamping The experiment of the function and effect of method, therefore illustrate its result below.

First, experimental method is outlined.It tests to confirm the first inclination angle alpha₁Influence, change the first mold 1 First inclination angle alpha of (with reference to Fig. 2A)₁(with reference to Fig. 2 B) and carry out the first forming process (step a, b in referring to Fig.1), profit Carry out the second forming process (step c, d in referring to Fig.1) (with reference to Fig. 3 A) with the second mold 3, and by after forming it is convex at The springback capacity of shape product 121 is compared.

The size of convex formed products 121 as shaped object is as shown in Figure 23 A and Figure 23 B, product length 1000 The height of [mm], bending direction are 30 [mm], and the width of trench bottom 123a is 20 [mm], and the width of flange part 125 is 25 [mm], The radius of curvature for the cross part that longitudinal wall part 123b intersects with flange part 125 is 1000 [mm].Blank has used 590MPa grades of materials (tensile strength (tensile strength) σ_TS=590 [MPa]) and 1180MPa grades of material (tensile strength sigmas_TS=1180 [MPa]).The both sides of above-mentioned blank are that plate thickness is 1.2 [mm], and Young's modulus is 210000 [MPa].Press machine (press Forming machine) use 1000tonf hydraulic punchs.Δ ε as formula (1)_maxBy 4 σ_TS/ E assign the case where and Calculate as a result, using 590MPa grades of materials in the case of, the first inclination angle alpha₁Upper limit value be 26.4 [°], make In the case of 1180MPa grades of materials, the first inclination angle alpha₁Upper limit value be 61.6 [°].

It tests and is carried out about the group (group 1~group 4) of 4 stamping conditions.First, each group is described in detail.

Group 1 is not pad and carry out stamping group to 590MPa grades of materials.As the stamping of group 1, carry out Example 1 of the present invention, example of the present invention 2, conventional example 1, comparative example 1 and comparative example 2 it is stamping.Example 1 and example of the present invention 2 of the present invention It is to make the first inclination angle alpha₁Range it is stamping when meeting formula (1).Conventional example 1 is using diel shown in Figure 35 141 (the first inclination angle alphas₁=0 [°]) carried out (with reference to Figure 37) by the crash forming of a process it is stamping.Compare Example 1 is the first inclination angle alpha₁<Second inclination angle alpha₂When it is stamping.Comparative example 2 be more than the first inclination angle alpha₁'s It is stamping when upper limit value (26.4 [°]).

Group 2 is that have liner and carry out stamping group to 590MPa grades of materials.As the stamping of group 2, carry out Example 3 and conventional example 2 of the present invention it is stamping.Example 3 of the present invention is identical as example 2 of the present invention other than using liner.Conventional example 2 It is identical as conventional example 1 other than using liner.Example 3 of the present invention carries out the first forming process (with reference to figure using the first mold 35 Step a in 14, b), by the second inclination angle alpha of the second mold 3₂It is set as 0 [°] and carries out the second forming process.Conventional example 2 Use common punch (the first inclination angle alpha₁=0 [°]) and attached padded punch die carried out crash forming.

Group 3 is identical as group 1 other than using 1180MPa grades of materials.That is, the example of the present invention 4 carried out as group 3, sheet Example 5, conventional example 3, comparative example 3 and comparative example 4 it is each stamping other than using 1180MPa grades of materials, with this hair Bright example 1, example of the present invention 2, conventional example 1, comparative example 1 and comparative example 2 are distinguished identical.Group 4 is other than using 1180MPa grades of materials It is identical as group 2.That is, as group 4 and the example of the present invention 6 that carries out and conventional example 4 it is each stamping in addition to using 1180MPa grades of materials Other than material, distinguish with example 3 of the present invention and conventional example 2 identical.

Convex formed products 121 after forming are determined by 3 d shape testing device.Then, as shown in fig. 40, exist It is carried out in a manner of keeping the section in the length direction center of measurement shape consistent with the same cross-sectional of shape of product on CAD software After the pairing of position, Zs of the Bounce distance Δ z as the measurement shape and shape of product at the part end of convex formed products 121 has been calculated Coordinate difference.In embodiment 1, Bounce distance Δ z is set as the index of bouncing distortion caused by the rebound of convex formed products 121. If Bounce distance Δ z is just, then it represents that part bouncing distortion upward, if Bounce distance Δ z is negative, then it represents that part bounces downwards Deformation, if absolute value is small, then it represents that rebound is few.

Table 1 is shown each stamping condition, the first inclination angle alpha of the present embodiment 1₁Upper limit value and in each punching press The case where shape evaluation result of the convex formed products 121 shaped under molding condition is summarized.As the shape evaluation knot Fruit, whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 1 for the generation of the fold of convex formed products 121.Zero mark indicates " nothing Fold ", × mark indicate " having fold ".

[table 1]

As shown in table 1, in the example of the present invention 1~6 of group 1~groups 4, fold is not all generated.Moreover, in the above-mentioned present invention In any one of example 1~6, Bounce distance Δ z reduces than the conventional example of the group belonging to each example of the present invention, can reduce and be drawn by rebound The bouncing distortion risen.

On the other hand, the first inclination angle alpha as the comparative example 1₁<Second inclination angle alpha₂In the case of, Bounce distance Δ z Become compared with the Bounce distance Δ z of conventional example 1 almost unchanged as a result, being unable to get the reducing effect of rebound.This point is closed Also the same in comparative example 3, comparative example 3 is almost unchanged result compared with conventional example 3.Moreover, in comparative example 2 and comparative example In 4, the first inclination angle alpha₁It has been more than upper limit value, therefore in the first forming process, fold is produced in flange part 125.

As previously discussed, about convex formed products 121, it is applicable in the method for the present invention, makes the first inclination angle alpha₁For formula (1) It carries out in range stamping, thus not will produce fold in convex formed products 121, convex formed products 121 can be reduced Rebound.Even if moreover, according to the comparison of conventional example 2 and example 3 of the present invention and the comparison of conventional example 4 and example 6 of the present invention it is found that In the case where having used liner, the press-processing method by implementing the present invention can also reduce returning for convex formed products 121 Bullet.

Embodiment 2

Next, illustrating the embodiment of the present invention 2.The above embodiments 1 are saying when shaping convex formed products 121 It is bright, but in the present embodiment 2, carry out the specific experiment for confirming effect when shaping down convex formed products 127, therefore with Lower its result of explanation.

Shape as convex formed products 127 under shaped object is as shown in Figure 24 A and Figure 24 B, other than convex under, with figure The shape of convex formed products 121 shown in 23A and Figure 23 B is identical.Moreover, the blank used in the present embodiment 2, press machine with it is upper It is identical to state embodiment 1.

The stamping condition of the experiment carried out in the present embodiment 2 is set as and the group of embodiment 1 1~groups 4 corresponding groups 5 ~groups 8.Convex formed products 127 are as other than shaped object under for each stamping condition of group 5~groups 8, with group 1~groups 4 points It is not roughly the same.As the stamping of group 5, example 7 of the present invention, example of the present invention 8, conventional example 5, comparative example 5 carried out and have compared Example 6 it is stamping.As the stamping of group 6, the stamping of example 9 and conventional example 6 of the present invention has been carried out.As group 7 It is stamping, carry out the stamping of example 10 of the present invention, example of the present invention 11, conventional example 7, comparative example 7 and comparative example 8.As Group 8 it is stamping, carried out the stamping of example 12 and conventional example 8 of the present invention.

Example 7, example of the present invention 8, example of the present invention 10, example of the present invention 11 and 5~comparative example of comparative example 8 of the present invention use Fig. 8 A institutes The first mold 23 shown carries out the first forming process, by the second inclination angle alpha of the second mold 29 shown in Fig. 9 A₂(with reference to figure It 9B) is set as 0 [°] and has carried out the second forming process.5~comparative example of comparative example 8 is by the first inclination angle alpha₁It is set as by formula (2) The first inclination angle alpha indicated₁Range it is outer and carried out stamping situation.On the other hand, example 9 of the present invention, the present invention Example 12 and 5~conventional example of conventional example 8 be other than convex formed products 127 are shaped object under, with the example of the present invention 3 of embodiment 1, this Example 6 and 1~conventional example of conventional example 4 are distinguished identical.

It should be noted that Δ ε by above formula (2)_maxBy 4 σ_TS/ E assign value calculate as a result, using In the case of 590MPa grades of materials, the first inclination angle alpha₁Upper limit value be 28.5 [°], using 1180MPa grades of materials feelings Under condition, the first inclination angle alpha₁Upper limit value be 75.2 [°].Moreover, the evaluation method of the rebound of the present embodiment 2 and above-mentioned implementation Example 1 is identical.

Table 2 is shown each stamping condition, the first inclination angle alpha of the present embodiment 2₁Upper limit value and in each punching press The case where shape evaluation result of convex formed products 127 summarizes under being shaped under molding condition.As the shape evaluation as a result, under it is convex Whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 2 for the generation of the fold of formed products 127.Zero mark indicates " corrugationless ", × mark indicates " having fold ".

[table 2]

As shown in table 2, in the example of the present invention 7~12 of group 5~groups 8, fold is not all generated.Moreover, in these present invention In any one of example 7~12, Bounce distance Δ z reduces than the conventional example of the group belonging to each example of the present invention, can reduce by springing back Caused bouncing distortion.

On the other hand, first inclination angle alpha as comparative example 5₁<Second inclination angle alpha₂In the case of, Bounce distance Δ z As having almost no change compared with the Bounce distance Δ z of conventional example 5 as a result, the reducing effect that cannot be sprung back.This point is closed Also the same in comparative example 7, comparative example 7 and conventional example 7 are the results not changed.Moreover, in comparative example 6 and comparative example 8, the One inclination angle alpha₁It has been more than upper limit value, therefore in the second forming process, fold is produced in flange part 125.In addition, than Compared in example 8, in the first forming process, rupture is produced in flange part 125.

As previously discussed, the convex formed products 127 about under, be applicable in the method for the present invention and by the first inclination angle alpha₁It is set as formula (2) carry out stamping in the range of, convex formed products 127 do not generate fold under as a result, can reduce down convex formed products 127 rebound.Moreover, the comparison of comparison and conventional example 8 and example 12 of the present invention from conventional example 6 and example 9 of the present invention it is found that Even if using padding, the stamping rebound that can also reduce down convex formed products 127 through the invention.

Embodiment 3

Next, illustrating the embodiment of the present invention 3.The above embodiments 1 and embodiment 2 are to carry out the by crash forming Explanation when one forming process, but in the present embodiment 3, when having carried out being identified through draw forming the first forming process of progress Effect experiment, therefore explain its result.

Shape of product and above-described embodiment 1 as shaped object are equally convex formed products (with reference to Figure 23 A and Figure 23 B) 121.Moreover, the blank and press machine that are used in the present embodiment 3 are identical as embodiment 1 and embodiment 2.

The stamping condition of the experiment carried out in the present embodiment 3 is set as and the group of embodiment 1 1~groups 4 corresponding groups 9 ~groups 12.Each stamping condition of group 9~groups 12 carries out except through draw forming other than the first forming process, with group 1~ 4 difference of group is identical.As the stamping of group 9, example 13, example of the present invention 14, conventional example 9, comparative example 9 and ratio of the present invention have been carried out It is stamping compared with example 10.As the stamping of group 10, the stamping of example 15 and conventional example 10 of the present invention has been carried out.As Group 11 it is stamping, carried out the punching press of example 16, example of the present invention 17, conventional example 11, comparative example 11 and comparative example 12 of the present invention Forming.As the stamping of group 12, the stamping of example 18 and conventional example 12 of the present invention has been carried out.

Example 13, example of the present invention 14, example of the present invention 16, example of the present invention 17 and 9~comparative example of comparative example 12 of the present invention use figure First mold 49 shown in 19 carries out the first forming process, by the second inclination angle alpha of the second mold 3 shown in Fig. 3 A₂It is set as 0 [°] and carried out the second forming process.But 9~comparative example of comparative example 12 is so that the first inclination angle alpha₁It is advised as formula (1) Mode outside fixed range has carried out stamping situation.Example 15 and example of the present invention 18 of the present invention have using shown in Figure 25 Incidentally the first mold 75 the first forming process of progress of the first punch die 77 of liner 39, punch 53, a pair of of charge support 55, will scheme Second inclination angle alpha of the second mold 3 shown in 3A₂It is set as 0 [°] and carries out the second forming process.On the other hand, conventional example 9 And conventional example 11 passes through one using the diel 79 with punch die 81, punch 83, a pair of of charge support 85 shown in Figure 26 The draw forming of process has carried out the forming of convex formed products 121 (with reference to Figure 27).Conventional example 10 and conventional example 12 except through Draw forming carries out other than the first forming process, distinguishes with the conventional example 2 and conventional example 4 of embodiment 1 identical.

It should be noted that similarly to Example 1, using 590MPa grades of materials, the first inclination angle alpha₁ Upper limit value be 26.4 [°], using 1180MPa grades of materials in the case of, the first inclination angle alpha₁Upper limit value be 61.6 [°].Moreover, the evaluation method of the rebound of the present embodiment 3 is identical as above-described embodiment 1 and embodiment 2.

Table 3 is shown each stamping condition, the first inclination angle alpha of the present embodiment 3₁Upper limit value and in each punching press The case where shape evaluation result of the convex formed products 121 shaped under molding condition summarizes.As the shape evaluation as a result, convex Whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 3 for the generation of the fold of formed products 121.Zero mark indicates " corrugationless ", × mark indicates " having fold ".

[table 3]

As shown in table 3, in the example of the present invention 13~18 of group 9~groups 12, fold is not all generated.Moreover, in above-mentioned sheet In any one of example 13~18, Bounce distance Δ z all than the conventional example of the group belonging to each example of the present invention reduce, can reduce by Bouncing distortion caused by rebound.

On the other hand, first inclination angle alpha as comparative example 9₁<Second inclination angle alpha₂In the case of, Bounce distance Δ z As having almost no change compared with the Bounce distance Δ z of conventional example 9 as a result, being unable to get the reducing effect of rebound.This point It is also the same about comparative example 11.Moreover, in comparative example 10 and comparative example 12, the first inclination angle alpha₁It has been more than upper limit value, because This produces fold in the first forming process, in flange part 125.

As previously discussed, it is applicable in the method for the present invention about convex formed products 121, the first forming work is carried out by draw forming Sequence, and by the first inclination angle alpha₁Be set as carrying out in the range of formula (1) it is stamping, thus convex formed products 121 will not Fold is generated, the rebound of convex formed products 121 can be reduced.Moreover, comparison, Yi Jixian from conventional example 10 and example 15 of the present invention There is the comparison of example 12 and example 18 of the present invention it is found that even if can if through the invention stamping using liner Enough reduce the rebound of convex formed products 121.

Embodiment 4

Next, illustrating the embodiment of the present invention 4.In above-described embodiment 3, the drawing of convex formed products 121 is illustrated Forming, but in the present embodiment 4, the draw forming of convex formed products 127 has carried out experiment similarly to Example 3 about under, Therefore following to illustrate its result.

Shape of product and above-described embodiment 2 as shaped object be equally (with reference to Figure 24 A and Figure 24 B) under convex formed products 127.Moreover, the blank and press machine that are used in the present embodiment 4 are identical as 1~embodiment of above-described embodiment 3.

The stamping condition of the experiment carried out in the present embodiment 4 is set as and the group of embodiment 2 5~groups 8 corresponding groups 13~groups 16.Each stamping condition of group 13~groups 16 carries out except through draw forming other than the first forming process, with group 5 ~group 8 difference are identical.As the stamping of group 13, example 19 of the present invention, example of the present invention 20, conventional example 13, comparative example have been carried out 13 and comparative example 14 it is stamping.As the stamping of group 14, striking out for example 21 and conventional example 14 of the present invention has been carried out Shape.As the stamping of group 15, example 22, example of the present invention 23, conventional example 15, comparative example 15 and comparative example 16 of the present invention have been carried out It is stamping.As the stamping of group 16, the stamping of example 24 and conventional example 16 of the present invention has been carried out.

Example 19, example of the present invention 20, example of the present invention 22, example of the present invention 23 and 13~comparative example of comparative example 16 of the present invention use figure The first mold 87 with punch die 89, punch 91, a pair of of charge support 93 shown in 28 carries out the first forming process, by Fig. 9 A institutes Second inclination angle alpha of the second mold 29 shown₂(with reference to Fig. 9 B) is set as 0 [°] and carries out the second forming process.But compare 13~comparative example of example 16 is the first inclination angle alpha that formula (2) indicates₁Range outside it is stamping.On the other hand, conventional example 13 And conventional example 15 passes through a work using the diel 95 with punch die 97, punch 99, charge support 101 shown in Figure 29 The forming of the draw forming of sequence convex formed products 127 under having carried out.Conventional example 14 and conventional example 16 carry out except through draw forming Other than first forming process, distinguish with the conventional example 6 and conventional example 8 of embodiment 2 identical.

It should be noted that similarly to Example 2, according to the above formula (2) when using 590MPa grades of materials, the first inclination angle Spend α₁Upper limit value be 28.5 [°].The first inclination angle alpha when 1180MPa grades of materials is used₁Upper limit value be 75.2 [°]. Moreover, the evaluation method of the rebound of the present embodiment 4 is identical as 1~embodiment of above-described embodiment 3.

Table 4 is shown each stamping condition, the first inclination angle alpha of the present embodiment 4₁Upper limit value and in each punching press The case where shape evaluation result of convex formed products 127 summarizes under being shaped under molding condition.As the shape evaluation as a result, under it is convex Whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 4 for the generation of the fold of formed products 127.Zero mark indicates " corrugationless ", × mark indicates " having fold ".

[table 4]

As shown in table 4, in the example of the present invention 19~24 of group 13~groups 16, fold is not all generated.Moreover, in above-mentioned sheet In any one of example 19~24, Bounce distance Δ z all than the conventional example of the group belonging to each example of the present invention reduce, can reduce by Bouncing distortion caused by rebound.

On the other hand, first inclination angle alpha as comparative example 13₁<Second inclination angle alpha₂In the case of, become and existing There is the Bounce distance Δ z of example 13 compared to unchanged as a result, being unable to get the reducing effect of rebound.This point is about comparative example 15 Equally, comparative example 15 and conventional example 15 are the results having almost no change.Moreover, in comparative example 14 and comparative example 16, first Inclination angle alpha₁More than upper limit value, therefore in the second forming process, fold is produced in flange part 125.

As previously discussed, convex formed products 127 are applicable in the method for the present invention about under, and the first forming work is carried out by draw forming Sequence, and by the first inclination angle alpha₁It is set as carrying out stamping, the production of convex formed products 127 under thus not making in the range of formula (2) Raw fold, and the rebound of convex formed products 127 can be reduced down.Moreover, comparison, Yi Jixian from conventional example 14 and example 21 of the present invention Have the comparison of example 16 and example 24 of the present invention it is found that even if used pad in the case of through the invention stamping The rebound of convex formed products 127 can be reduced down.

Embodiment 5

Next, illustrating the embodiment of the present invention 5.1~embodiment of above-described embodiment 4 be to the flange part of shape of product not Inclined structure carries out the explanation of stamping situation, but in the present embodiment 5, inclines about the flange part to shape of product Oblique structure carries out stamping situation and has carried out specific experiment, therefore illustrates its result.

Figure 30 is the sectional view of the formed products 103 as shaped object in the present embodiment 5.As shown in figure 30, formed products 103 flange parts 125 with width 25 [mm].As shown in figure 30, the flange part 125 of formed products 103 is to relative to horizontal line Positive direction (the increased direction of flange forming section (not shown) angulation of longitudinal wall part 123b and mold) tilts+5 [°]. Formed products 103 are other than the case where such flange part 125 tilts, with above-described embodiment 1 and the convex formed products of embodiment 3 121 is identical (with reference to Figure 23 A).In fig. 30, it for structure same as the convex formed products 121, is marked in the same manner as Figure 23 B Label.

The experimental method of the present embodiment 5 is identical as above-described embodiment 3.Specifically, in the experiment of the present embodiment 5, make The first forming process is carried out by draw forming with the first mold 49 (referring to Fig.1 9), uses the second inclination angle alpha₂=5 [°] The diel of crash forming carries out the second forming process, by the two processes, by blank be configured to shape of product at Shape product 103.At this point, blank uses 1180MPa grades of materials, press machine use knot identical with 1~embodiment of above-described embodiment 4 Structure.It should be noted that in the present embodiment 5, the first inclination angle alpha₁Upper limit value be 74.7 [°].

The group 17 of the stamping condition of the present embodiment 5 includes example 25 of the present invention, example of the present invention 26, conventional example 17, compares Example 17 and comparative example 18.Example 25 and example of the present invention 26 of the present invention are to make the first inclination angle alpha₁Range rushing when meeting formula (1) Pressing formation.Conventional example 17 is that diel (the first inclination angle alpha of 5 [°] is tilted using flange forming section₁=5 [°]) pass through one The draw forming of a process carries out stamping.Comparative example 17 is the first inclination angle alpha₁<Second inclination angle alpha₂When punching press Forming.Comparative example 18 be more than the first inclination angle alpha₁Upper limit value (74.7 [°]) when it is stamping.Moreover, this implementation The evaluation method of the rebound of example 5 is identical as 1~embodiment of above-described embodiment 4.

Table 5 is shown each stamping condition, the first inclination angle alpha of the present embodiment 5₁Upper limit value and in each punching press The case where shape evaluation result of the formed products 103 shaped under molding condition summarizes.As the shape evaluation as a result, formed products Whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 5 for the generation of 103 fold.Zero mark indicates " corrugationless ", × mark It indicates " having fold ".

[table 5]

As shown in table 5, in any one of example 25 of the present invention and example of the present invention 26, fold is not all generated.Moreover, above-mentioned Example of the present invention 25 and example of the present invention 26 any one in, Bounce distance Δ z all than conventional example 17 reduce, can reduce and be drawn by rebound The bouncing distortion risen.

On the other hand, first inclination angle alpha as comparative example 17₁<Second inclination angle alpha₂In the case of, Bounce distance Δ z As having almost no change compared with the Bounce distance Δ z of conventional example 17 as a result, being unable to get the reducing effect of rebound.Moreover, By the first inclination angle alpha₁It is set as in the comparative example 18 of 80 [°], in the first forming process, pleat is produced in flange part 125 Wrinkle.

It is able to confirm that according to above-mentioned result, even if in the formed products 103 with inclined flange part 125, is passed through The press-processing method of the present invention, the reduction and other effects that can be also sprung back.

Embodiment 6

Next, illustrating the embodiment of the present invention 6.1~embodiment of above-described embodiment 5 is to shape flange width in both sides Explanation when identical structure, but in the present embodiment 6, about shaping effect of the flange width in the different structure in both sides Fruit is tested, therefore illustrates its result.

Figure 31 is the sectional view of the formed products 41 as shaped object in the present embodiment 6.Formed products 41 are convex shape, As shown in figure 31, there is the mutually different a pair of flanges portion of width 125.In the formed products 41, as shown in figure 31, a side's is convex The width of edge 125 is 30 [mm], and the width of the flange part 125 of another party is 20 [mm].Other shapes and above-described embodiment 1 And the convex formed products 121 of embodiment 3 are identical (with reference to Figure 23 A and Figure 23 B).In Figure 31, for the convex formed products 121 Identical structure marks label in the same manner as Figure 23 B.

As the stamping condition of the present embodiment 6, blank has used above-mentioned 1180MPa grades of material.Press machine uses Structure identical with 1~embodiment of above-described embodiment 5.Moreover, the return of strain is suitable for the side that flange width is 30 [mm] Flange part 125.It should be noted that the first inclination angle alpha₁Upper limit value be 47.1 [°].

The group 18 of the stamping condition of the present embodiment 6 includes example 27 of the present invention, example of the present invention 28, example of the present invention 29, sheet Example 30, conventional example 18, comparative example 19 and comparative example 20.Example of the present invention 27~example 30, comparative example 19 and comparative example of the present invention 20 use the first mold 43 shown in Figure 18 so that the flange part 125 of flange width length becomes and the first inclination angle alpha₁It is identical The mode of angle carries out the first forming process (referring to Fig.1 8 in step a, b), and the is carried out using the second mold 3 shown in Fig. 3 A Two forming processes (referring to Fig.1 8 in step c, d).But in second forming process, the second inclination angle alpha₂For 0 [°]. Moreover, comparative example 19 and comparative example 20 are all the first inclination angle alphas₁For the first inclination angle alpha indicated by formula (1)₁Range outside It is stamping.Comparative example 19 is the first inclination angle alpha₁<Second inclination angle alpha₂When it is stamping.Comparative example 20 is to be more than First inclination angle alpha₁Upper limit value when it is stamping.Conventional example 18 is carried out using diel 141 shown in Figure 35 The crash forming of one process.

In formed products 41, since the flange width of two sides is different, two sides' of the formed products 41 at lower dead center is convex The balance of the torque of edge 125 is destroyed.As cause, in the demoulding of formed products 41, is generated in formed products 41 and apply spring And assign the rebound of torsional deflection.Therefore, in the present embodiment 6, for the evaluation of torsion, windup-degree θ [°] (ginsengs have been calculated According to Figure 16) as formed products 41 end measurement shape and shape of product trench bottom 123a angle of inclination difference.

Table 6 is shown each stamping condition, the first inclination angle alpha of the present embodiment 6₁Upper limit value and in each punching press The case where shape evaluation result of the formed products 41 shaped under molding condition summarizes.As the shape evaluation as a result, formed products 41 The generation of fold whether there is or not (zero, ×) and windup-degree θ [°] are as shown in table 6.Zero mark indicates " corrugationless ", and × mark indicates " having fold ".

[table 6]

As shown in table 6, in any one of example of the present invention 27~example 30 of the present invention, the generation of fold is not all observed.It turns round Gyration θ is along with the first inclination angle alpha₁Increase and change, in the first inclination angle alpha₁As negative direction under=40 [°] Windup-degree.Moreover, windup-degree θ is in the first inclination angle alpha₁Become minimum in the case of=30 [°].

On the other hand, as comparative example 19, in the first inclination angle alpha₁<Second inclination angle alpha₂In the case of, torsion angle θ is spent as being had almost no change compared with the windup-degree θ of conventional example 18 as a result, being unable to get the reducing effect of rebound.And And in comparative example 20, the first inclination angle alpha₁It has been more than upper limit value, therefore in the first forming process, has been produced in flange part 125 Fold is given birth to.

It is able to confirm that according to above-mentioned result, even if flange width is in the stamping of the different formed products 41 in both sides In, press-processing method through the invention, the reduction and other effects that can be also sprung back.In addition to this, further it is shown that the present invention In the case of the reduction of torsion is also effective.

Embodiment 7

Next, illustrating the embodiment of the present invention 7.1~embodiment of above-described embodiment 6 is in the axial center of formed products Portion is equipped with the flange part of bending, and inclines as first using in the entire axial length of the first mold and the flange forming section of the second mold Rake angle α₁>Second inclination angle alpha₂The first mold and the second mold carry out stamping situation.The present embodiment 7 is punching press Forming is only equipped with the flange part of bending in the axial central portion of formed products, is tilted although being equipped in the axial both sides of central portion The case where being the formed products of unbent flange part, indicates to have used the flange to bending only in the first mold and the second mold The position that portion is formed becomes the first inclination angle alpha₁>Second inclination angle alpha₂The first mold and the second mold experiment.

The present embodiment 7 it is stamping in, in the first forming process, using the first mold 105 shown in Figure 32, In second forming process, by the second inclination angle alpha of the second mold 3 shown in Fig. 3 A, Fig. 3 B₂It is set as 0 [°], and uses Second mold 3.First mold 105 is with a portion of for the first mold 49 (referring to Fig.1 9) used embodiment 3 The structure of change.Specifically, as shown in figure 32, the first mold 105 has punch die 107, punch 109, in the both sides of punch 109 The charge support 111 of setting, only axial central portion become the first inclination angle alpha₁>Second inclination angle alpha₂.It needs to illustrate It is in Figure 32, for structure same as the first mold 49, to mark same label.

In the present embodiment 7, as the shape of product of shaped object, blank, press machine and stamping condition with it is above-mentioned Embodiment 3 is identical.The stamping condition of the experiment carried out in the present embodiment 7 is set as corresponding with the group of embodiment 3 9~groups 12 Group 19~groups 22.Each stamping condition of group 19~groups 22 in addition to use the first mold 105 with above-mentioned construction into The first forming process of row it is stamping other than, with group 9~group 12 difference it is identical.As the stamping of group 19, this has been carried out Example 33, example of the present invention 34, conventional example 19, comparative example 21 and comparative example 22 it is stamping.As group 20 it is stamping, The stamping of example 35 and conventional example 20 of the present invention is carried out.As the stamping of group 21, example 36 of the present invention, this hair have been carried out Bright example 37, conventional example 21, comparative example 23 and comparative example 24 it is stamping.As the stamping of group 22, the present invention has been carried out Example 38 and conventional example 22 it is stamping.

Example 33, example of the present invention 34, example of the present invention 36, example of the present invention 37 and 21~comparative example of comparative example 24 of the present invention use figure First mold 105 shown in 32 carries out the first forming process, and the second forming process is carried out using the second mold 3 shown in Fig. 3 A. But 21~comparative example of comparative example 24 is so that the first inclination angle alpha₁As the first inclination angle alpha as defined in formula (1)₁Model It encloses outer mode and has carried out stamping example.Example 35 and example of the present invention 38 of the present invention are in addition to using with above-mentioned construction First mold 105 carry out the first forming process it is stamping other than, divide with the example of the present invention 15 and example of the present invention 18 of embodiment 3 It is not identical.On the other hand, conventional example 19 and conventional example 21 use the drawing that diel 79 passes through a process shown in Figure 26 Forming has carried out the forming of convex formed products 121.Conventional example 20 and conventional example 22 are in addition to using first with above-mentioned construction Mold 105 carry out the first forming process it is stamping other than, distinguish with the conventional example 10 and conventional example 12 of embodiment 3 identical.

It should be noted that same as embodiment 1 and embodiment 3, according to above formula when having used 590MPa grades of materials (1), the first inclination angle alpha₁Upper limit value be 26.4 [°].The first inclination angle alpha when 1180MPa grades of materials is used₁It is upper Limit value is 61.6 [°].Moreover, the evaluation method of the rebound of the present embodiment 7 is identical as 1~embodiment of above-described embodiment 5.

Table 7 is shown each stamping condition, the first inclination angle alpha of the present embodiment 7₁The upper limit value of acquirement and at this It is each it is stamping under the conditions of the shape evaluation result of convex formed products 121 that shapes the case where summarizing.As the shape evaluation knot Fruit, whether there is or not (zero, ×) and Bounce distance Δ z [mm] are as shown in table 7 for the generation of the fold of convex formed products 121.Zero mark indicates " nothing Fold ", × mark indicate " having fold ".

[table 7]

As shown in table 7, in the example of the present invention 33~38 of group 19~groups 22, fold is not all generated.Moreover, in above-mentioned sheet In any one of example 33~38, Bounce distance Δ z all than the conventional example of the group belonging to each example of the present invention reduce, can reduce by Bouncing distortion caused by rebound.

On the other hand, first inclination angle alpha as comparative example 21₁<Second inclination angle alpha₂In the case of, Bounce distance Δ z As having almost no change compared with the Bounce distance Δ z of conventional example 19 as a result, being unable to get the reducing effect of rebound.This point Also the same about comparative example 23, comparative example 23 and conventional example 21 are the results having almost no change.Moreover, in comparative example 22 and ratio Compared in example 24, the first inclination angle alpha₁More than upper limit value, therefore in the first forming process, fold is produced in flange part 125.

As previously discussed, the convex formed products about the flange part for being only equipped with bending in axial central portion, even only axis To central portion become the first inclination angle alpha₁>Second inclination angle alpha₂In the case of, by by the first inclination angle alpha₁It is set as formula (1) carried out in the range of it is stamping, can also avoid convex formed products generate fold and reduce convex formed products return Bullet.Even if moreover, the comparison of comparison and conventional example 22 and example 38 of the present invention from conventional example 20 and example 35 of the present invention it is found that Using padding, press-processing method through the invention can also reduce the rebound of convex formed products.

Industrial applicibility

As previously discussed, press-processing method of the invention has upper warpage or lower warpage for the longitudinal wall part in groove shape portion Bent flanges portion formed products it is stamping useful, can reduce formed products particularly suitable for not changing shape of product Three-dimensionality rebound is stamping as torsion or bending.

Label declaration

1 first mold (embodiment 1)

3 second molds (embodiment 1)

5 first punch dies

The groove shape forming section of the first punch dies of 5a side

The flange forming section of the first punch dies of 5b side

7 first punches

The groove shape forming section of the first punches of 7a side

The flange forming section of the first punches of 7b side

9 first groove shape forming sections

10 cross parts

11 first flange forming sections

12 flexure planes

13 second punch dies

The groove shape forming section of the second punch dies of 13a side

The flange forming section of the second punch dies of 13b side

15 second punches

The groove shape forming section of the second punches of 15a side

The flange forming section of the second punches of 15b side

17 second groove shape forming sections

18 cross parts

19 second flange forming sections

20 flexure planes

21 blanks

23 first molds (embodiment 2)

25 first punch dies

The groove shape forming section of the first punch dies of 25a side

The flange forming section of the first punch dies of 25b side

27 first punches

The groove shape forming section of the first punches of 27a side

The flange forming section of the first punches of 27b side

29 second molds (embodiment 2)

31 second punch dies

The groove shape forming section of the second punch dies of 31a side

The flange forming section of the second punch dies of 31b side

33 second punches

The groove shape forming section of the second punches of 33a side

The flange forming section of the second punches of 33b side

35 first molds (embodiment 3)

37 first punch dies

39 liners

41 formed products (the different formed products of flange width)

43 first molds (embodiment 4)

45 first punch dies

47 first punches

49 first molds (embodiment 5)

51 punch dies

53 punches

55 charge supports

61 formed products (only flange part is convex)

63 formed products (only convex under flange part)

75 first molds (embodiment 3)

77 first punch dies

79 diels (embodiment 3, conventional example)

81 punch dies

83 punches

85 charge supports

87 first molds (embodiment 4)

89 punch dies

91 punches

93 charge supports

95 diels (embodiment 4, conventional example)

97 punch dies

99 punches

101 charge supports

103 formed products (the inclined formed products of flange part)

105 first molds (embodiment 7)

107 punch dies

109 punches

111 charge supports

121 convex formed products

123 groove shape portions

123a trench bottoms

123b longitudinal wall parts

125 flange parts

Convex formed products under 127

141 diels (conventional example its 1)

143 punch dies

145 punches

147 diels (conventional example its 2)

149 punch dies

151 punches

Claims

1. a kind of press-processing method, is formed formed products, the formed products have groove shape portion, and the formed products The longitudinal wall part of at least one party in a pair of of the longitudinal wall part for forming the groove shape portion has flange part, and the flange part is with to described The mode of the trench bottom side protrusion in groove shape portion is bent, and the press-processing method is characterized in that,

The first forming process is carried out using the first mold, the second forming process, the first mold tool are carried out using the second mold Have the first groove shape forming section that the groove shape portion is formed and the first flange that the flange part is formed at Shape portion, second mold have angle of inclination the second groove shape forming section identical with the first groove shape forming section and the Two flanges forming section,

It is handed over the first flange forming section by the longitudinal wall forming section of the first groove shape forming section of first mold The cross part of fork and the flexure plane with curvature identical with the curvature of the flange part of the cross part and first flange Forming section angulation is angle [alpha]₁, by the longitudinal wall forming section of the second groove shape forming section of second mold with Cross part that the second flange forming section intersects and with curvature identical with the curvature of the flange part of the cross part Flexure plane and the second flange forming section angulation are angle [alpha]₂, will be from the bending on the basis of by the flexure plane It is set as negative facing towards the trench bottom side and its opposite side is set as timing, angle [alpha]₁With angle [alpha]₂Relationship be set as α₂<α₁,

Proceed as follows forming：Make the line of the length direction for making the flange part generated in first forming process The long compression strain shortened is returned by assigning the deformation for making the line length elongation in second forming process.

2. press-processing method according to claim 1, which is characterized in that

By the longitudinal wall forming section of the second groove shape forming section of second mold and the second flange forming section The radius of curvature of the cross part of intersection is set as ρ₀[mm], the flange width shaped using second forming process is set as L Back amount Δ ε (the Δ ε of [mm], the strain that the effect for making rebound change will be accessed and fold can be inhibited>0) upper limit value It is set as Δ ε_maxWhen, the α₁With the α₂Meet following formula (1),

[mathematical expression 1]

3. a kind of press-processing method, is formed formed products, the formed products have groove shape portion, and the formed products The longitudinal wall part of at least one party in a pair of of the longitudinal wall part for forming the groove shape portion has flange part, and the flange part is with to described The mode of the trench bottom side recess in groove shape portion is bent, and the press-processing method is characterized in that,

Proceed as follows forming：Make the line of the length direction for making the flange part generated in first forming process The elongation strain of long elongation is returned by assigning the deformation for making the line length shorten in second forming process.

4. press-processing method according to claim 3, which is characterized in that

By the longitudinal wall forming section of the second groove shape forming section of second mold and the second flange forming section The radius of curvature of the cross part of intersection is set as ρ₀[mm], the flange width shaped using second forming process is set as L Back amount Δ ε (the Δ ε of [mm], the strain that the effect for making rebound change will be accessed and fold can be inhibited>0) upper limit value It is set as Δ ε_maxWhen, the α₁With the α₂Meet following formula (2),

[mathematical expression 2]

5. press-processing method according to any one of claims 1 to 4, which is characterized in that

First forming process is carried out using crash forming.

6. press-processing method according to any one of claims 1 to 4, which is characterized in that

First forming process is carried out using draw forming.

7. press-processing method according to any one of claims 1 to 4, which is characterized in that

In the case where the trench bottom for being formed in the groove shape portion has the formed products of ram bottom, first forming process The position for being equivalent to the ram bottom in blank is pressed using liner and is carried out stamping.

8. press-processing method according to any one of claims 1 to 4, which is characterized in that

The flange part of either one in the pair of longitudinal wall part is applicable in first forming process and second forming process.

9. press-processing method according to any one of claims 1 to 4, which is characterized in that

It is applicable in first forming process and second forming process in the flange part of two sides of the pair of longitudinal wall part.

10. press-processing method according to any one of claims 1 to 4, which is characterized in that

It is arranged in the entire axial length of the formed products in the flange part of bending,

The α of first mold and second mold₁With the α₂Relationship in first mold and second mould It is set as α in a part for the mold axial direction of tool₂<α₁。

11. press-processing method according to any one of claims 1 to 4, which is characterized in that

The α of first mold and second mold₁With the α₂Relationship in first mold and second mould It is set as α in the overall length of tool₂<α₁。

12. press-processing method according to any one of claims 1 to 4, which is characterized in that

It is arranged in an axial part for the formed products in the flange part of bending,

The α of first mold and second mold₁With the α₂Relationship only in first mold and described second It is set as α on the position that the flange part to bending in mold is formed₂<α₁。

13. press-processing method according to any one of claims 1 to 4, which is characterized in that