WO2015194401A1 - Procédé de formage à la presse à froid - Google Patents

Procédé de formage à la presse à froid Download PDF

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Publication number
WO2015194401A1
WO2015194401A1 PCT/JP2015/066384 JP2015066384W WO2015194401A1 WO 2015194401 A1 WO2015194401 A1 WO 2015194401A1 JP 2015066384 W JP2015066384 W JP 2015066384W WO 2015194401 A1 WO2015194401 A1 WO 2015194401A1
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WO
WIPO (PCT)
Prior art keywords
shape
molding
cross
press
press molding
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PCT/JP2015/066384
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English (en)
Japanese (ja)
Inventor
健太郎 佐藤
和彦 樋貝
小日置　英明
靖廣 岸上
和紀 笹本
高志 米山
Original Assignee
Ｊｆｅスチール株式会社
フタバ産業株式会社
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Application filed by Ｊｆｅスチール株式会社, フタバ産業株式会社 filed Critical Ｊｆｅスチール株式会社
Publication of WO2015194401A1 publication Critical patent/WO2015194401A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/04—Door pillars ; windshield pillars

Definitions

  • the present invention relates to a cold press forming method for manufacturing a center pillar part having a curved portion that is curved while changing its sectional height in the longitudinal direction.
  • Such super high-tensile material has high strength, while ductility as a steel sheet is reduced. Therefore, molding defects such as cracks and wrinkles are likely to occur in ultra high tensile materials during press molding. For this reason, various press molding techniques have been studied in order to produce products free of cracks and wrinkles.
  • drawing is a method of forming a material with a punch and a die while restraining the material with a die and a blank holder.
  • a highly ductile 590 MPa class steel sheet is used as a material for an automobile part
  • the automobile part can be drawn without causing cracks or wrinkles in the steel sheet as the material.
  • an ultra-high tensile material having a small ductility is used as a material for an automobile part, if the material (steel sheet) is constrained by a wrinkle presser, cracking is likely to occur in the ultra-high tensile material as the material.
  • Foam molding is a method in which a material is bent while being bent with an upper tool and a lower tool. Foam molding is often used for press molding of ultra-high-tensile materials with low ductility because deformation applied to the material can be minimized. Form molding is an effective pressing method for reducing press working force.
  • foam molding can be applied to press molding of a part having a simple cross-sectional shape in the longitudinal direction, such as a rocker (side sill) part.
  • foam molding is applicable to press molding of parts targeted by the present invention, specifically, press molding of center pillar parts having curved portions that are curved while changing the cross-sectional height in the longitudinal direction. difficult.
  • a third method a method of avoiding occurrence of cracks and wrinkles by two-step press molding, in which a material is drawn to the extent that no cracking occurs, and then the material after the drawing is foamed.
  • a general center pillar part is curved with its cross section changing in the longitudinal direction, and when this center pillar part is molded by foam molding, large wrinkles are generated in the flange part of the center pillar part that is largely curved. (For example, see FIG. 10).
  • Patent Document 1 proposes a press molding method for reducing wrinkles generated in a curved flange of a center pillar part in hot press molding. This method is a press molding method in which only a curved portion where wrinkles are likely to occur is formed by drawing while enlarging a blank shape and constraining the material with a wrinkle presser, and performing foam molding in other portions. This method has an effect of reducing wrinkles because the material is drawn while restraining the curved portion of the material by pressing the wrinkles.
  • Patent Document 1 is hot press forming, and the material is formed with a low material strength by increasing the temperature of the material during forming. For this reason, it is difficult to apply the method described in Patent Document 1 described above to the press working of the super high tensile strength material of the present invention intended for cold press forming.
  • the present invention has been made in order to solve the above-described problems, and uses a center pillar component having a curved portion that is curved while changing its cross-sectional height in the longitudinal direction, and uses an ultra-high tensile material of 980 MPa class or higher.
  • An object of the present invention is to obtain a cold press molding method that can be produced without generating cracks and wrinkles.
  • the cold press forming method according to the present invention has a shape in which two T-shaped vertical sides are opposed to each other at both longitudinal ends (connected T-shape).
  • a center pillar part having a curved portion that is curved while changing the cross-sectional height in the longitudinal direction, and has a connected T-shape at both ends in the longitudinal direction.
  • a trimming step a part of the top plate portion in the hat cross section of the trimming part is pressed with a pad, and the top plate portion, the side wall portion and the flange portion
  • a first molded part having a connecting T-shape at both longitudinal ends, a cross-sectional depth of 10 to 30 mm in the longitudinal direction, and a hat cross-sectional portion in the longitudinal cross-section by drawing.
  • the first press forming process (press forming part) is formed by drawing, the trimming process for trimming the first molded part to obtain a trimmed part, and the product shape part, the step shape part, and the inclined surface part are formed by form molding.
  • the center pillar part having a curved portion that is curved while changing the cross-sectional height in the longitudinal direction is formed into a product shape even when an ultra-high tensile material of 980 MPa class or higher is used. There is an effect that cold press molding can be performed without generating cracks or wrinkles in the portion (hat cross section).
  • FIG. 1A is a perspective view of a first mold used in a cold press forming method according to an embodiment of the present invention.
  • FIG. 1B is a perspective view of a second mold used in the cold press forming method according to one embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line AA of the second mold shown in FIG. 1B.
  • FIG. 3A is a perspective view of a center pillar component that is a molding target of the cold press molding method according to an embodiment of the present invention.
  • FIG. 3B is a cross-sectional view of the center pillar part shown in FIG. 3C is a side view of the center pillar component shown in FIG. 3A.
  • FIG. 3A is a perspective view of a first mold used in a cold press forming method according to an embodiment of the present invention.
  • FIG. 1B is a perspective view of a second mold used in the cold press forming method according to one embodiment of the present invention.
  • FIG. 2 is a cross
  • FIG. 4A is a perspective view of a first molded part molded in the first press molding step of the cold press molding method according to one embodiment of the present invention.
  • 4B is a cross-sectional view taken along the line CC of the first molded part shown in FIG. 4A.
  • FIG. 5 is a perspective view of the trimming component obtained in the trimming step of the cold press forming method according to the embodiment of the present invention.
  • FIG. 6A is a perspective view of a second molded part molded in the second press molding step of the cold press molding method according to one embodiment of the present invention.
  • FIG. 6B is a cross-sectional view taken along the line DD of the second molded part shown in FIG. 6A.
  • FIG. 7A is an explanatory view illustrating the first half of the second press molding step in the cold press molding method according to one embodiment of the present invention.
  • FIG. 7B is a cross-sectional view taken along the line EE for explaining the first half of the second press molding step shown in FIG. 7A.
  • FIG. 8A is an explanatory view illustrating the second half of the second press molding step in the cold press molding method according to one embodiment of the present invention.
  • FIG. 8B is a cross-sectional view taken along the line FF for explaining the second half of the second press forming step shown in FIG. 8A.
  • FIG. 9 is a perspective view showing an example of a center pillar part formed by a press forming method performed for comparison.
  • FIG. 10 is a perspective view showing another example of the center pillar part molded by the press molding method performed for comparison.
  • a cold press forming method is a cold press forming method for manufacturing a center pillar part 1 (see FIGS. 3A to 3C) by cold press forming, and is drawn in a longitudinal direction by drawing.
  • the trimming component 4 has a hat cross-section 10 comprising a top plate 10a, a vertical wall 10b, and a flange 10c.
  • the product shape portion 12 to be formed, the step shape portion 31 continuous outside the portion corresponding to the vertical side of the T-shape in the connected T-shape of the trimming component 4, and the step shape portion 31 continuously rising outside the step shape portion 31 A second press molding step of molding the second molded part 9 (see FIGS. 6A and 6B) having the inclined surface portion 33 by foam molding.
  • center pillar component 1 will be described first, and then each step of the cold press forming method according to an embodiment of the present invention will be described.
  • the center pillar component 1 has a curved portion 5 that is curved while the cross-sectional height changes in the longitudinal direction.
  • the center pillar component 1 has a connection T-shape as shown in FIG. 3A.
  • the connection T-shape is a shape in which two T-shaped vertical sides are opposed to each other at both longitudinal ends of the center pillar component 1.
  • the portion corresponding to the vertical side of the T-shape is such that the longitudinal cross section of the center pillar part 1 has a hat shape. It is formed. In the following description, this part is referred to as a hat cross section 3.
  • the hat cross section 3 is continuously formed on the top plate portion 3a, the vertical wall portion 3b formed on the side portion of the top plate portion 3a, and the outside of the vertical wall portion 3b. And a flange portion 3c.
  • the boundary portion between the top plate portion 3a and the vertical wall portion 3b is an R shoulder (R-shoulder portion) having a curvature radius R of 5 to 10 mm.
  • R-shoulder portion having a curvature radius R of 5 to 10 mm.
  • the longitudinal wall part 3b and the flange part 3c do not exist in the longitudinal direction both ends of the center pillar component 1, and the both ends of a T-shaped horizontal side (refer FIG. 3A).
  • the center pillar part 1 having the shape as described above is manufactured by cold press molding using a super high tensile material having a strength level of 980 MPa or higher as a blank material.
  • each step of the cold press forming method according to the present embodiment will be described together with a mold used in each step and a molded part formed in each step.
  • the first press forming step is a cross section of 10 to 30 mm in the longitudinal direction by drawing using the first mold 11 (see FIG. 1A). This is a step of press-molding the first molded part 7 (see FIG. 4A) at a depth.
  • die 11 is a metal mold
  • die 11 has the die
  • the die 13, punch 14, and wrinkle presser 15 of the first mold 11 are configured to mold a blank material such as ultra-high tensile material with a cross-sectional depth of 10 to 30 mm. That is, the depth of the first mold 11 is set to 10 to 30 mm.
  • the reason why the lower limit of the depth of the first die 11 is set to 10 mm is that the radius R of the curvature of the R shoulder of the center pillar part 1 described above is 5 to 10 mm. This is because the blank material can be press-molded into the first molded part 7 that is the basis of the center pillar part 1 by the first press-molding process even when the curvature radius R is.
  • the reason why the upper limit of the depth of the first mold 11 is set to 30 mm is that when the depth of the first mold 11 exceeds 30 mm, the ultra-high tensile material of 980 MPa class or higher is used as a blank material and drawn. This is because there is a risk that cracking occurs in the first molded part 7 in the first press molding process.
  • the first molded part 7 is an intermediate part (interim part) that is press-molded by the first mold 11 in the process of manufacturing the center pillar part 1 from the blank material by the cold press molding method according to the present embodiment.
  • the first molded part 7 has a connection T shape at both ends in the longitudinal direction, has a cross-sectional depth within a certain range in the longitudinal direction, and a top plate portion 8a in a cross section perpendicular to the longitudinal direction.
  • a hat cross section 8 comprising a vertical wall portion 8b and a flange portion 8c.
  • the depth of the cross section along the longitudinal direction of the first molded part 7, that is, the cross-sectional depth of each of the connected T-shaped portion of the first molded part 7 and the hat cross section 8 is 10 to 30 mm.
  • the cross-sectional depth of the first molded part 7, that is, the molding depth when the blank material is press-molded into the first molded part 7 by drawing is set to 10 to 30 mm. ing. For this reason, even if drawing using an ultra-high tensile material of 980 MPa or higher as a blank material, it is possible to avoid the occurrence of cracking of the first molded part 7 and hence the cracking of the center pillar part 1. it can.
  • the trimming step includes the left and right ends of the portion corresponding to the lateral side of the connected T-shaped T-shape in the first molded part 7 and the flange portion.
  • This is a step of trimming the left and right side portions of 8c to obtain the trimming component 4 (see FIG. 5).
  • FIG. 5 among the parts constituting the trimming component 4, those similar to the first molded component 7 are denoted by the same reference numerals.
  • FIG. 5 the portion trimmed and removed from the first molded part 7 in order to obtain the trimmed part 4 is indicated by hatching.
  • the reason for trimming the first molded part 7 in the first press molding process in this way is to facilitate the second press molding process which is the next process. is there.
  • the second press forming step uses the second mold 17 (see FIG. 1B) and forms the trimming component 4 by the above-described trimming step. Is press-molded into the second molded part 9 (see FIGS. 6A and 6B). Specifically, in the present embodiment, in the second press molding step, a part of the top plate portion 8a in the hat cross section 8 of the trimming component 4 obtained by trimming the first molding component 7 is replaced with the second mold 17.
  • a product shape portion 12 having a hat cross-sectional portion 10 composed of a top plate portion 10a, a vertical wall portion 10b and a flange portion 10c, and a T-shaped vertical side of the connecting T-shape of the trimming component 4
  • a second molded part 9 (see FIGS. 6A and 6B) having a step shape portion 31 continuous outside the corresponding portion and an inclined surface portion 33 rising obliquely upward continuously outside the step shape portion 31 This is a step of forming by mold forming using the mold 17.
  • the second mold 17 is a mold that is used in the second press molding process and for molding the second molded part 9 from the trimmed part 4 obtained by trimming the first molded part 7 by the trimming process described above.
  • the second mold 17 includes a second upper mold 19, a second lower mold 21, and a pad 23.
  • the second mold 17 includes a pair of upper and lower product forming portions 25U and 25L as product forming portions for forming the product shape portion 12 of the second molded part 9 (see FIG. 6A). have.
  • the second mold 17 has a pair of upper and lower step shape portion forming portions 27U and a step shape portion forming portion 27L as step shape portion forming portions for forming the step shape portion 31 (see FIGS. 6A and 6B).
  • the second mold 17 has a pair of upper and lower inclined surface portion forming portions 29U and an inclined surface portion forming portion 29L as inclined surface portion forming portions for forming the inclined surface portion 33 (see FIGS. 6A and 6B).
  • the second upper mold 19 has a product molding part 25U, a step shape part molding part 27U, and an inclined surface part molding part 29U.
  • the product molding part 25U is formed in a concave shape corresponding to the product shape of the molding object (specifically, the center pillar part 1).
  • the step shape portion molding portion 27U is formed on both sides of the product molding portion 25U.
  • the inclined surface portion forming portions 29U are formed on both sides of the product forming portion 25U and the step shape portion forming portion 27U.
  • the second lower mold 21 has a product molding part 25L, a step shape part molding part 27L, and an inclined surface part molding part 29L.
  • the product molding portion 25L is formed in a convex shape corresponding to the product shape of the molding target (specifically, the center pillar component 1).
  • the step shape portion molding portion 27L is formed on both sides of the product molding portion 25L.
  • the inclined surface portion forming portions 29L are formed on both sides of the product forming portion 25L and the step shape portion forming portion 27L.
  • the pad 23 presses a part of the top plate portion 8a in the hat cross section 8 of the trimming component 4 in the second press molding process.
  • the pad 23 is provided so as to hold a substantially T-shaped range in the top plate portion 8a (see FIG. 5).
  • the pad 23 can suppress a portion of the trimming component 4 where wrinkling is a problem.
  • the pad 23 may hold down a wider range of the top plate portion 8a.
  • the second molded part 9 is manufactured by press-molding the trimmed part 4 by the second mold 17 in the process of manufacturing the center pillar part 1 from the blank material by the cold press-forming method according to the present embodiment. It is an intermediate part.
  • the second molded part 9 includes a product shape part 12 having a hat cross-sectional part 10 including a top plate part 10 a, a vertical wall part 10 b, and a flange part 10 c, and a trimming part 4. It has a step shape portion 31 that continues outside the portion corresponding to the vertical side of the T-shape in the letter shape, and an inclined surface portion 33 that rises obliquely upward continuously to the outside of the step shape portion 31.
  • the product shape portion 12 is a portion that is press-molded so as to have the product shape of the target center pillar part 1.
  • the hat cross section 10 of the product shape portion 12 is formed so that the cross section in the longitudinal direction of the second molded part 9 has a hat shape.
  • the step shape portion 31 is continuous with the outer side of the flange portion 10 c of the hat cross-sectional portion 10 with a step.
  • the inclined surface portions 33 are respectively formed outside the step shape portions 31 on both sides of the hat cross-sectional portion 10.
  • FIGS. 6A and 6B among the parts constituting the second molded part 9, those similar to the product of the center pillar part 1 (see FIGS. 3A to 3C) are given the same subscripts. Yes.
  • the second molded part 9 having the configuration shown in FIGS. 6A and 6B is obtained by trimming the step shape part 31, the inclined surface part 33, etc., so that the center pillar part 1 which is the final product shape (see FIGS. 3A to 3C) )become.
  • FIGS. 7A and 7B and FIGS. 8A and 8B are explanatory diagrams of a second press molding step in the cold press molding method according to the embodiment of the present invention.
  • FIG. 7A and 7B are diagrams for explaining the first half of the second press molding step in the present embodiment.
  • 7A and 7B are diagrams for explaining the state of the part 6 in the middle of the press molding from the trimming part 4 to the second molded part 9, and the state change of the part 6 in the middle of the press molding in the first half of the second press molding process. It is shown in the figure.
  • FIG. 7A is a plan view for explaining the wrinkled state of the part 6 in the middle of press forming in the first half of the second press forming step.
  • FIG. 7A is a plan view for explaining the wrinkled state of the part 6 in the middle of press forming in the first half of the second press forming step.
  • FIG. 7B is a cross-sectional view for explaining the press forming state of the part 6 in the middle of press forming in the first half of the second press forming step, that is, a cross-sectional view taken along the line EE of the part 6 in the middle of press forming shown in FIG. 7A. It is shown in the figure.
  • FIG. 7B also shows a cross-sectional view taken along the line EE of the second upper mold 19 and the second lower mold 21 of the second mold 17.
  • FIGS. 8A and 8B are diagrams for explaining the second half of the second press molding step in the present embodiment.
  • FIGS. 8A and 8B illustrate changes in the state of the part 6 in the middle of the press molding in the latter half of the second press molding process as diagrams for explaining the state of the part 6 in the middle of the press molding described above.
  • FIG. 8A shows a plan view for explaining the wrinkled state of the part 6 during the press molding in the second half of the second press molding process.
  • FIG. 8B is a cross-sectional view for explaining the press forming state of the part 6 in the middle of press forming in the second half of the second press forming step, that is, a cross-sectional view taken along the line FF of the part 6 in the middle of press forming shown in FIG. 8A. It is shown in the figure.
  • FIG. 8B also shows a cross-sectional view taken along the line FF of the second upper mold 19 and the second lower mold 21 of the second mold 17.
  • states a to e are during press molding in accordance with the distance to the bottom dead center of the second upper mold 19 in the second press molding process.
  • Each state of the part 6 and the second mold 17 is shown. That is, in FIGS. 7A and 7B, the state a is a state where the distance to the bottom dead center of the second upper mold 19 is 30 mm (30 mm UP).
  • the state b is a state where the distance to the bottom dead center of the second upper mold 19 is 20 mm (20 mm UP).
  • the state c is a state where the distance to the bottom dead center of the second upper mold 19 is 10 mm (10 mm UP).
  • the state d is a state where the distance to the bottom dead center of the second upper mold 19 is 5 mm (5 mm UP).
  • the state e is a state where the distance to the bottom dead center of the second upper mold 19 is 2 mm (2 mm UP).
  • wrinkles 55 generated in the part 6 in the middle of press molding in the second press molding step are indicated by wavy lines.
  • the case where the second upper mold 19 is moved to the second lower mold 21 side will be described as an example, and the process in which the second molded part 9 is molded by the second press molding process will be described.
  • the moving direction of the second mold 17 is not limited to the downward direction (the direction in which the second upper mold 19 approaches the second lower mold 21).
  • the upward direction (the second lower mold 21 is the second direction).
  • the direction approaching the upper mold 19) may be used. That is, the moving direction of the second mold 17 may be a direction in which the second upper mold 19 and the second lower mold 21 approach each other. The same applies to the first mold 11 in the first press molding step described above.
  • the trimming component 4 is placed on the second lower mold 21, and the second lower mold 21 is in a state of receiving and supporting the trimming component 4.
  • the second upper mold 19 moves downward toward the second lower mold 21.
  • the second mold 17 presses the second upper mold 19 against the trimming part 4 supported and supported by the second lower mold 21 and starts press molding of the trimming part 4.
  • the second mold 17 changes the state of the second upper mold 19 and the second lower mold 21 to the state a shown in FIG. 7B and then to the state b shown in FIG. 7B.
  • the second upper mold 19 abuts the step shape portion forming portion 27U against the trimming component 4 being pressed, that is, the component 6 being pressed, as shown in FIG. 7B. (See dotted circle 41 in FIG. 7B).
  • the step shape portion molding portion 27U faces the part 6 in the middle of press molding toward the step shape portion molding portion 27L of the second lower mold 21 as indicated by a dotted circle 41 in FIG. 7B. Push.
  • the top of the inclined surface of the inclined surface portion molding portion 29L in the second lower mold 21 abuts against the part 6 in the middle of press molding, as shown in FIG. 7B (the dotted circle 43 in FIG. 7B). reference).
  • the shoulder portion in the product molding portion 25L of the second lower mold 21 comes into contact with the component 6 in the middle of press molding (see the dotted line circle 45 in FIG. 7B).
  • the second upper mold 19 further moves downward from the state b toward the second lower mold 21.
  • die 17 further advances the press molding with respect to the component 6 in the middle of press molding.
  • the second mold 17 changes the state of the second upper mold 19 and the second lower mold 21 from the state b shown in FIG. 7B to the state c.
  • the second upper mold 19 further moves down from the state c toward the second lower mold 21.
  • die 17 further advances the press molding with respect to the component 6 in the middle of press molding.
  • the second mold 17 changes the state of the second upper mold 19 and the second lower mold 21 from the state c shown in FIG. 7B to the state d shown in FIG. 8B and subsequently to the state e.
  • the second upper mold 19 further moves the product molding part 25U and the inclined surface part molding part 29U to the second lower mold 21 as compared with the state c (see FIG. 7B). Move closer.
  • the step shape portion molding portion 27U strongly presses the part 6 in the middle of press molding toward the step shape portion molding portion 27L.
  • the second upper mold 19 further approaches the second lower mold 21 and presses the part 6 in the middle of press molding more strongly against the second lower mold 21.
  • the part 6 in the middle of press molding is in a state of being substantially entirely sandwiched between the second upper mold 19 and the second lower mold 21.
  • wrinkles 55 are generated in the extra portion 37 of the part 6 in the middle of press molding due to the increase in the effect of suppressing wrinkles as described above.
  • the wrinkles 55 are not generated in the part 35 (for example, the top plate portion 10a or the flange portion 10c) that becomes the product shape.
  • the portion 35 having the product shape corresponds to the product shape portion 12 of the second molded part 9 shown in FIG. 6A.
  • wrinkles for example, wrinkles 55 illustrated in FIGS. 9 and 10
  • the product shape portion 12 for example, the top plate portion 10 a and the flange portion 10 c
  • the product molding section 25U shown in FIG. 8B is configured to replace the part 6 in the middle of press molding with the product molding section 25L (see FIG. 7B) of the second lower mold 21 after the state e. To press) and complete the press molding of the part 35 to be the product shape.
  • the part 6 in the middle of press molding is press-molded into the second molded part 9 shown in FIG. 6A.
  • the second molded part 9 becomes the center pillar part 1 (see FIG. 3A) by trimming the step shape portion 31, the inclined surface portion 33 and the like.
  • the hat cross section 10 of the second molded part 9 shown in FIG. 6B corresponds to the hat cross section 3 of the center pillar part 1 shown in FIG. 3B.
  • FIG. 9 shows a center pillar part 51 as a comparative part formed by a deep drawing forming process with the goal of forming a center pillar part having the same shape as the center pillar part 1 (see FIG. 3A).
  • FIG. 10 shows a center pillar part 57 as a comparative part molded by two steps of drawing molding similar to the present invention and foam molding different from the present invention.
  • the portion corresponding to the T-shaped lateral side of the connected T-shaped intermediate part by the drawing process after the drawing process similar to the first press molding process of the present embodiment is performed, the portion corresponding to the T-shaped lateral side of the connected T-shaped intermediate part by the drawing process.
  • the left and right ends of the flange and the left and right sides of the flange are trimmed. Trimming parts obtained by this trimming are formed using a mold different from the second press molding step of the present embodiment.
  • the center pillar part 57 shown in FIG. 10 was molded.
  • the mold used for forming the center pillar part 57 is a mold formed only by the product molding portion in the second mold 17 (see FIG. 1B) of the present embodiment, that is, the step shape portion shown in FIG.
  • the mold does not have a molding part (step shape part molding part 27U, step shape part molding part 27L) or an inclined surface part molding part (inclined surface part molding part 29U, inclined surface part molding part 29L).
  • the center pillar part 51 formed by one deep drawing process has a substantially T-shape of the R shoulder part, particularly the top plate part, due to the material restraint by the wrinkle presser.
  • a crack 53 occurred in the vicinity. Such cracks 53 can be avoided by reducing the wrinkle pressure, but in such a case, as shown in FIG. 9, wrinkles 55 occurred on the top plate.
  • the first mold 11 shown in FIG. 1A has a length of 10 to 30 mm so that cracking does not occur.
  • the first molded part 7 (see FIG. 4A) is drawn and formed with a shallow cross-sectional depth. For this reason, cracking does not occur in the R shoulder of the first molded part 7 without reducing the wrinkle pressing pressure of the blank material. As a result, cracks can be prevented from occurring at the R shoulder of the center pillar component 1.
  • the first formed part 7 in the first press forming step, is drawn with a cross-sectional depth of 10 to 30 mm in the longitudinal direction. As a result, cracking of the first molded part 7 could be prevented as described above.
  • the subsequent trimming step the left and right ends of the portion corresponding to the T-shaped lateral side of the first molded part 7 and the left and right side portions of the flange portion 8c are trimmed.
  • FIG. The trimming part 4 shown is foam formed into a second molded part 9 shown in FIG. 6A.
  • the top plate portion 8a of the trimming component 4 is pressed by the pad 23 of the second mold 17, so that generation of wrinkles in the top plate portion 8a can be suppressed.
  • the 2nd molded component 9 is shape
  • the blank material does not generate cracks or wrinkles in the center pillar part 1 that is a product shape.
  • the center pillar part 1 can be press-molded.
  • the cold press forming method according to the present invention is useful for manufacturing a connected T-shaped part that is curved while changing its cross-sectional height in the longitudinal direction, and in particular, using a super high tensile material as a blank material. Even if it is used, it is suitable for a cold press molding method for producing a center pillar part having a curved portion having the above-mentioned shape without generating cracks and wrinkles.

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  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

La présente invention porte dans un mode de réalisation sur un procédé de formage à la presse à froid, comprenant une première étape de formage à la presse dans laquelle un premier élément formé (7) ayant une partie à section transversale en forme de chapeau (8) est formée par emboutissage dans une section transversale orthogonale à la direction longitudinale ayant une profondeur de section transversale de 10 à 30 mm dans la direction longitudinale ; une étape d'ébavurage dans laquelle le premier élément formé (7) est ébavuré pour obtenir un élément d'ébavurage ; et une seconde étape de formage à la presse dans laquelle une partie d'une plaque supérieure dans la partie à section transversale en forme de chapeau de l'élément d'ébavurage est pressée avec un tampon et un second élément formé (9) est formé par formage à la mousse, le second élément formé comprenant une partie en forme de produit (12) ayant une partie à section transversale en forme de chapeau (10), une partie en forme de marche (31) qui est dans la continuité de l'extérieur d'une zone correspondant à un côté vertical d'une forme en T dans une forme de T reliée et une partie de surface inclinée (33) qui est dans la continuité de l'extérieur de la partie (31) en forme de marche et monte en biais vers le haut.
PCT/JP2015/066384 2014-06-16 2015-06-05 Procédé de formage à la presse à froid WO2015194401A1 (fr)

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JP2014123247A JP5863886B2 (ja) 2014-06-16 2014-06-16 冷間プレス成形方法

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WO2015194401A1 true WO2015194401A1 (fr) 2015-12-23

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CN108698104A (zh) * 2016-02-16 2018-10-23 杰富意钢铁株式会社 冲压成型品的制造方法
EP3473530A4 (fr) * 2016-06-16 2020-04-01 Nippon Steel Corporation Corps étiré destiné à un élément structural d'automobile, procédé de fabrication de corps étiré destiné à un élément structural d'automobile, et appareil de fabrication de corps étiré destiné à un élément structural d'automobile
CN112334244A (zh) * 2018-07-03 2021-02-05 杰富意钢铁株式会社 模具形状的设计方法及冲压部件的制造方法
CN113631292A (zh) * 2019-03-28 2021-11-09 本田技研工业株式会社 冲压成型方法

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JP6176429B1 (ja) * 2016-02-16 2017-08-09 Ｊｆｅスチール株式会社 プレス成形品の製造方法
JP6662113B2 (ja) * 2016-03-07 2020-03-11 日本製鉄株式会社 湾曲部を有する部品を成形するプレス金型
CN108883455B (zh) * 2016-03-28 2019-09-24 日本制铁株式会社 压制成型品的制造方法
JP6485423B2 (ja) * 2016-08-30 2019-03-20 Ｊｆｅスチール株式会社 プレス成形品の製造方法
JP6690605B2 (ja) 2017-07-06 2020-04-28 Ｊｆｅスチール株式会社 プレス成形方法
JP7173847B2 (ja) * 2018-11-30 2022-11-16 ダイハツ工業株式会社 プレス成形方法
JP7111057B2 (ja) * 2019-05-15 2022-08-02 Ｊｆｅスチール株式会社 プレス成形方法

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CN108698104A (zh) * 2016-02-16 2018-10-23 杰富意钢铁株式会社 冲压成型品的制造方法
CN108698104B (zh) * 2016-02-16 2019-12-06 杰富意钢铁株式会社 冲压成型品的制造方法
EP3473530A4 (fr) * 2016-06-16 2020-04-01 Nippon Steel Corporation Corps étiré destiné à un élément structural d'automobile, procédé de fabrication de corps étiré destiné à un élément structural d'automobile, et appareil de fabrication de corps étiré destiné à un élément structural d'automobile
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CN112334244A (zh) * 2018-07-03 2021-02-05 杰富意钢铁株式会社 模具形状的设计方法及冲压部件的制造方法
EP3819037A4 (fr) * 2018-07-03 2021-08-11 JFE Steel Corporation Procédé de conception de forme de moule et procédé de production de pièce pressée
CN113631292A (zh) * 2019-03-28 2021-11-09 本田技研工业株式会社 冲压成型方法
CN113631292B (zh) * 2019-03-28 2023-08-11 本田技研工业株式会社 冲压成型方法

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