US20130213109A1 - Press product forming method - Google Patents
Press product forming method Download PDFInfo
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- US20130213109A1 US20130213109A1 US13/719,764 US201213719764A US2013213109A1 US 20130213109 A1 US20130213109 A1 US 20130213109A1 US 201213719764 A US201213719764 A US 201213719764A US 2013213109 A1 US2013213109 A1 US 2013213109A1
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- Prior art keywords
- forming
- blank
- press
- bending
- press product
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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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/20—Bending sheet metal, not otherwise provided for
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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
- B21D22/02—Stamping using rigid devices or tools
Definitions
- This disclosure relates to a press product forming method.
- the press product is a curved press product which exhibits a curved shape in plan view or in side view
- an excess material resulting from the curved shape is more likely to cause forming defects, such as wrinkles, in the flange portions.
- FIG. 1 is a perspective view of a mold for forming a curved press product according to the related art.
- a bending portion is not formed at a widthwise end portion of a blank.
- the widthwise end portion of the blank has low rigidity, and hence has low resistance against a force of shrinking the blank in a longitudinal direction. Therefore, as illustrated in FIG. 3 , the excess material resulting from the curved shape is more likely to cause wrinkles, with the result that a large number of wrinkles 140 occur in flange portions 107 .
- layers of wrinkles occur when the flange portions 107 are formed by lower surfaces 31 b of the upper forming sections 31 and upper surfaces 36 a of flange-portion forming sections 36 of the mold.
- a press product forming method for press-forming a curved press product the curved press product being formed into a hat-like cross-section including: an upper surface portion; side wall portions each bending and extending from a widthwise edge of the upper surface portion in a direction crossing the upper surface portion; and flange portions each bending and extending from an edge of each of the side wall portions, the widthwise edge of the upper surface portion being shaped so as to curve and extend along a longitudinal direction.
- the press product forming method includes: a pre-forming step of forming, at a widthwise end portion of a flat plate-like blank, a highly rigid portion extending along the longitudinal direction; and a main forming step of forming the upper surface portion and the side wall portions under a state in which the highly rigid portion is left.
- FIG. 1 is a perspective view of a mold for forming a curved press product according to the related art
- FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 , for illustrating a forming state in the midst of a main forming step according to the related art;
- FIG. 3 is a perspective view of the curved press product in the midst of the main forming step according to the related art
- FIG. 4A is a perspective view of a curved press product according to a first embodiment of this disclosure.
- FIG. 4B is a cross-sectional view of the curved press product taken along the line B-B of FIG. 4A ;
- FIG. 5A is a perspective view of a blank according to the first embodiment of this disclosure after completion of a pre-forming step
- FIG. 5B is a cross-sectional view of the blank taken along the line C-C of FIG. 5A ;
- FIG. 6 is a perspective view of a mold for forming a curved press product according to an example of this disclosure
- FIG. 7 is a cross-sectional view taken along the line D-D of FIG. 6 , for illustrating a forming state in the midst of a main forming step according to the example of this disclosure;
- FIG. 8 is a perspective view of the curved press product according to the example of this disclosure in the midst of the main forming step;
- FIG. 9 is a cross-sectional view taken along the line D-D of FIG. 6 , for illustrating a state after completion of a flange-portion flattening step
- FIG. 10A is a perspective view of a curved press product according to a second embodiment of this disclosure.
- FIG. 10B is a cross-sectional view of the curved press product taken along the line E-E of FIG. 10A ;
- FIG. 11A is a perspective view of a blank according to the second embodiment of this disclosure after completion of the pre-forming step
- FIG. 11B is a cross-sectional view of the blank taken along the line F-F of FIG. 11A ;
- FIG. 12A is a perspective view of a curved press product according to a third embodiment of this disclosure.
- FIG. 12B is a cross-sectional view of the curved press product taken along the line G-G of FIG. 12A ;
- FIG. 13A is a perspective view of a blank according to the third embodiment of this disclosure after completion of the pre-forming step
- FIG. 13B is a cross-sectional view of the blank taken along the line H-H of FIG. 13A ;
- FIG. 14A is a perspective view of a curved press product according to a fourth embodiment of this disclosure.
- FIG. 14B is a cross-sectional view of the curved press product taken along the line I-I of FIG. 14A ;
- FIG. 15A is a perspective view of a blank according to the fourth embodiment of this disclosure after completion of the pre-forming step
- FIG. 15B is a cross-sectional view of the blank taken along the line J-J of FIG. 15A ;
- FIG. 16A is a perspective view of a blank according to another embodiment of this disclosure.
- FIG. 16B is a cross-sectional view of the blank taken along the line K-K of FIG. 16A ;
- FIG. 17A is a perspective view of a blank according to the another embodiment of this disclosure after completion of the pre-forming step
- FIG. 17B is a cross-sectional view of the blank taken along the line L-L of FIG. 17A ;
- FIG. 18A is a perspective view of a curved press product according to the another embodiment of this disclosure after completion of the flange-portion flattening step.
- FIG. 18B is a cross-sectional view of the curved press product taken along the line M-M of FIG. 18A .
- W represents a width direction
- L represents a longitudinal direction
- UPR represents an upper side
- LWR represents a lower side
- a drawing viewed from the width direction W illustrates a side view
- a drawing viewed from the upper side UPR or the lower side LWR illustrates a plan view
- a drawing viewed from the longitudinal direction L illustrates a front view.
- a curved press product 1 is formed into a hat-like cross-section including: an upper surface portion 3 arranged on the upper side of the curved press product so as to extend in the longitudinal direction L; a pair of right and left side wall portions 5 each extending from a widthwise edge 3 a of the upper surface portion 3 obliquely downward (in a direction crossing the upper surface portion 3 ) ; and flange portions 7 bending and extending respectively from lower ends 5 a (edges) of the side wall portions 5 to both right and left sides.
- the widthwise edge 3 a of the upper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view.
- a press product forming method includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- the pre-forming step is carried out in such a manner that a highly rigid portion 9 extending along the longitudinal direction L is formed at each widthwise end portion of a flat plate-like blank (not shown).
- the highly rigid portion 9 includes a bending portion 11 which is formed through bending a widthwise end portion of the blank 2 obliquely to the upper side UPR (front surface side).
- the bending portion 11 and a body portion 13 form an angle ⁇ of, for example, approximately 10° to approximately 90°.
- the bending portion 11 is formed into a substantially straight shape in order to prevent occurrence of wrinkles at the time of pre-forming. Note that, after the pre-forming step and before the main forming step, the blank 2 may be heated.
- the main forming step is carried out in such a manner that the upper surface portion 3 and the side wall portions 5 are formed in the heated blank 2 using a mold which is described in detail later.
- the flange-portion flattening step is carried out in such a manner that the bending portion 11 of the highly rigid portion 9 formed in the pre-forming step is pressed and flattened into the flange portion using the above-mentioned mold.
- the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank 2 is heated.
- the blank is quenched. In this manner, the curved press product 1 that is increased in strength is completed as illustrated in FIG. 4A .
- a mold 21 includes an upper die 23 and a lower die 25 .
- the upper die 23 includes a mounting plate 27 and an upper forming die 29 provided under the mounting plate 27 .
- the upper forming die 29 is formed into a U-shape in front view, and includes a pair of right and left upper forming sections 31 extending downward, and a coupling section 32 bridging the upper forming sections 31 .
- the lower die 25 includes a mounting plate 33 and a lower forming die 35 provided on the mounting plate 33 .
- the lower forming die 35 is formed into a T-shape in front view, and includes flange-portion forming sections 36 provided on right and left sides thereof, and a lower forming section 37 formed through protruding upward a center portion thereof in a right-left direction.
- the lower forming section 37 is fitted between the pair of upper forming sections 31 .
- upper surfaces 36 a of the flange-portion forming sections 36 and an upper surface 37 a of the lower forming section 37 are formed so as to exhibit a convex shape that bulges to the upper side UPR in side view. Note that, as shown in FIG.
- the mold 21 according to this embodiment is formed of a simply-structured mold (forming mold) which is not provided with a wrinkle prevention device (blank holder) or the like.
- the upper surface portion 3 is formed in the heated blank in such a manner that a widthwise center portion of the blank is brought into contact with the upper surface of the lower forming section 37
- each side wall portion 5 is formed in the heated blank in such a manner that each widthwise side region of the blank is sandwiched between a side surface 37 b of the lower forming section 37 and an inner side surface 31 a of the upper forming section 31 .
- the bending portion 11 is formed at each widthwise end portion of the blank along the longitudinal direction. Accordingly, the widthwise end portion of the blank 2 has high rigidity, and thus has high resistance against a force of shrinking the blank in the longitudinal direction.
- the curved press product 1 is formed into a hat-like cross-section including: the upper surface portion 3 ; the side wall portions 5 each bending and extending from the widthwise edge 3 a of the upper surface portion 3 in a direction crossing the upper surface portion 3 ; and the flange portions 7 each bending and extending from the edge 5 a of each of the side wall portions 5 .
- the widthwise edge 3 a of the upper surface portion 3 is shaped so as to curve and extend along the longitudinal direction L.
- the press product forming method includes: the pre-forming step of forming, at the widthwise end portion of the flat plate-like blank, each bending portion 11 (highly rigid portion 9 ) extending along the longitudinal direction; and the main forming step of forming the upper surface portion 3 and the side wall portions 5 under a state in which each highly rigid portion 9 is left.
- the upper surface portion 3 and the side wall portions 5 are formed under the state in which each bending portion 11 extending along the longitudinal direction is left. Accordingly, each widthwise end portion of the blank 2 is increased in rigidity, and is increased in resistance against the force of shrinking the blank in the longitudinal direction. Therefore, at the time of forming the upper surface portion 3 and the side wall portions 5 , even when the excess material resulting from the curved shape causes action of the force of shrinking the blank in the longitudinal direction, it is possible to prevent or minimize the occurrence of forming defects, such as wrinkles and layers of wrinkles, in the flange portions 7 .
- Each highly rigid portion 9 includes the bending portion 11 formed through bending the widthwise end portion of the blank 2 obliquely to the front surface side, and hence it is possible to increase rigidity of the widthwise end portion of the blank 2 .
- the press product forming method further includes the flange-portion flattening step of pressing and flattening the bending portions 11 (highly rigid portions 9 ) into the flange portions 7 as illustrated in FIG. 9 . Accordingly, it is possible to prevent occurrence of wrinkles in the flange portions 7 , and to form the flat flange portions 7 . In other embodiments, the flange-portion flattening step is not necessary.
- the main forming step and the flange-portion flattening step may be carried out by hot press forming.
- This further increases the significance of forming the bending portion 11 at each widthwise end portion of the blank 2 so as to increase rigidity of the widthwise end portion. That is, in a case of cold press forming, the blank itself has higher rigidity than in a case of hot press forming. Accordingly, in the case of application of the force of shrinking the blank in the longitudinal direction, or at the time of forming the flange portions, wrinkles and layers of wrinkles are less likely to occur in the flange portions 7 . On the other hand, in the case of hot press forming, the blank itself has lower rigidity than in the case of cold press forming.
- the bending portion 11 is formed at the widthwise end portion of the blank 2 to thereby increase rigidity of the widthwise end portion. In this manner, it is possible to effectively prevent occurrence of wrinkles and layers of wrinkles.
- the widthwise edge 3 a of the upper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view.
- an inner curved widthwise edge 53 a and an outer curved widthwise edge 53 b of an upper surface portion 53 are each formed into an arc shape that curves along the longitudinal direction L in plan view.
- a cross-sectional shape illustrated in FIG. 10B is the same as that of the first embodiment illustrated in FIG. 4B , and the curved press product 51 is formed into a hat-like cross-section including the upper surface portion 53 , side wall portions 55 , and flange portions 57 .
- an inner curved flange portion is denoted by 57 a
- an outer curved flange portion is denoted by 57 b.
- a press product forming method includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- the pre-forming step is carried out in such a manner that a highly rigid portion 9 A extending along the longitudinal direction is formed at one of widthwise end portions of a flat plate-like blank (not shown).
- the highly rigid portion 9 A includes a bending portion 58 which is formed through bending a left widthwise end portion of the blank 52 obliquely to the upper side (front surface side).
- the bending portion 58 and a body portion 59 form an angle ⁇ of, for example, approximately 10° to approximately 90°.
- the bending portion 58 is provided in an outer curved region of the curved press product 51 in plan view. Still further, the bending portion 58 may be formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step.
- the main forming step and the flange-portion flattening step are the same as those of the first embodiment. Note that, similarly to the above-mentioned first embodiment, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- rigidity of the widthwise end portion is increased in such a manner that the bending portion 58 is formed at the widthwise end portion corresponding to the outer curved flange portion 57 b in which wrinkles are more likely to occur.
- the bending portion 58 is formed at the widthwise end portion corresponding to the outer curved flange portion 57 b in which wrinkles are more likely to occur.
- a curved press product 61 according to the third embodiment has the same shape as that of the curved press product 1 according to the first embodiment. That is, the curved press product 61 is formed into a hat-like cross-section including an upper surface portion 3 , side wall portions 5 , and flange portions 7 . Further, a widthwise edge 3 a of the upper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view.
- a press product forming method includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- the pre-forming step is carried out in such a manner that triangular ridges 63 (ridges) functioning as highly rigid portions 9 B and extending along the longitudinal direction are formed respectively at both widthwise end portions of a flat plate-like blank (not shown).
- ridges 63 ridges
- both the widthwise end portions of the flat plate-like blank are protruded to the upper side (front surface side), to thereby form the ridges 63 each having a dogleg cross-section protruding upward.
- each of the ridges 63 is formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step.
- the main forming step and the flange-portion flattening step are the same as those of the first and second embodiments. Note that, similarly to the above-mentioned first and second embodiments, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- the triangular ridges 63 are formed respectively at the widthwise end portions of the blank 62 , and thus rigidity of the widthwise end portions is increased. Accordingly, the highly rigid portions 9 B can effectively prevent occurrence of wrinkles and layers of wrinkles in the flange portions 7 .
- a curved press product 71 according to the fourth embodiment has the same shape as that of the curved press product 51 according to the second embodiment. That is, as illustrated in FIGS. 14A and 14 B, the curved press product 71 is formed into a hat-like cross-section including an upper surface portion 53 , side wall portions 55 , and flange portions 57 . Further, of the flange portions 57 , an inner curved flange portion is denoted by 57 a , and an outer curved flange portion is denoted by 57 b . An inner curved widthwise edge 53 a and an outer curved widthwise edge 53 b of the upper surface portion 53 are each formed into an arc shape that curves along the longitudinal direction L in plan view.
- a press product forming method includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- the pre-forming step is carried out in such a manner that a triangular ridge 73 (ridge) functioning as a highly rigid portion 9 C and extending along the longitudinal direction L is formed at one of widthwise end portions of a flat plate-like blank (not shown).
- a triangular ridge 73 ridge
- the triangular ridge 73 is provided in an outer curved region of the curved press product 71 in plan view.
- the ridge 73 is formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step.
- the main forming step and the flange-portion flattening step are the same as those of the first to third embodiments. Note that, similarly to the above-mentioned first to third embodiments, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- the triangular ridge 73 is formed at the widthwise end portion of the blank 72 , and thus rigidity of the widthwise end portion is increased. Accordingly, the highly rigid portion 9 C can effectively prevent occurrence of wrinkles and layers of wrinkles in the outer curved flange portion 57 b.
- a flat plate-like blank 90 is formed of a flat steel plate extending in an elongated manner as illustrated in FIGS. 16A and 16B , and includes a longitudinal center portion 93 having a relatively large width.
- a bending portion 95 (highly rigid portion 9 D shown in FIG. 17A ) is formed in such a manner that each widthwise end portion of the longitudinal center portion 93 of the flat plate-like blank 90 is bent obliquely to the upper side (front surface side).
- the blank 90 is formed into a blank 91 illustrated in FIGS. 17A and 17B .
- the bending portion is extended obliquely to the upper side (front surface side), but may be extended to the lower side (back surface side).
- a shape other than the triangular ridge is also applicable.
- a ridge having a ridge line is preferred.
- the highly rigid portions 9 to 9 C are pressed and flattened, but the highly rigid portions 9 to 9 C may be left unpressed and unflattened in the obtained products.
- the press forming according to this disclosure may include cold press forming which does not require heating of a blank and quenching performed after forming.
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Abstract
Provided is a press product forming method for press-forming a curved press product. The curved press product is formed into a hat-like cross-section including an upper surface portion, side wall portions, and flange portions. The press product forming method includes: a pre-forming step of forming, at a widthwise end portion of a flat plate-like blank, at least one bending portion extending along a longitudinal direction; and a main forming step of forming the upper surface portion and the side wall portions under a state in which the bending portion is left.
Description
- The present application claims priority from Japanese Patent Application No. 2012-035781 filed on Feb. 22, 2012, the entirety of which is hereby incorporated by reference into this application.
- 1. Field of the Invention
- This disclosure relates to a press product forming method.
- 2. Description of the Related Art
- There is known a technology of press-forming a press product, with Japanese Patent Application Laid-open No. 2010-36217 disclosing one example.
- However, in a case where the press product is a curved press product which exhibits a curved shape in plan view or in side view, an excess material resulting from the curved shape is more likely to cause forming defects, such as wrinkles, in the flange portions.
-
FIG. 1 is a perspective view of a mold for forming a curved press product according to the related art. As illustrated inFIG. 2 , in a curved press product 101 according to the related art, a bending portion is not formed at a widthwise end portion of a blank. Accordingly, the widthwise end portion of the blank has low rigidity, and hence has low resistance against a force of shrinking the blank in a longitudinal direction. Therefore, as illustrated inFIG. 3 , the excess material resulting from the curved shape is more likely to cause wrinkles, with the result that a large number ofwrinkles 140 occur in flange portions 107. Note that, when upper formingsections 31 of the mold are further lowered under the state illustrated inFIG. 2 , layers of wrinkles occur when the flange portions 107 are formed bylower surfaces 31 b of the upper formingsections 31 andupper surfaces 36 a of flange-portion forming sections 36 of the mold. - According to an exemplary embodiment of this disclosure, there is provided a press product forming method for press-forming a curved press product, the curved press product being formed into a hat-like cross-section including: an upper surface portion; side wall portions each bending and extending from a widthwise edge of the upper surface portion in a direction crossing the upper surface portion; and flange portions each bending and extending from an edge of each of the side wall portions, the widthwise edge of the upper surface portion being shaped so as to curve and extend along a longitudinal direction. In some embodiments, the press product forming method includes: a pre-forming step of forming, at a widthwise end portion of a flat plate-like blank, a highly rigid portion extending along the longitudinal direction; and a main forming step of forming the upper surface portion and the side wall portions under a state in which the highly rigid portion is left.
- In the accompanying drawings:
-
FIG. 1 is a perspective view of a mold for forming a curved press product according to the related art; -
FIG. 2 is a cross-sectional view taken along the line A-A ofFIG. 1 , for illustrating a forming state in the midst of a main forming step according to the related art; -
FIG. 3 is a perspective view of the curved press product in the midst of the main forming step according to the related art; -
FIG. 4A is a perspective view of a curved press product according to a first embodiment of this disclosure; -
FIG. 4B is a cross-sectional view of the curved press product taken along the line B-B ofFIG. 4A ; -
FIG. 5A is a perspective view of a blank according to the first embodiment of this disclosure after completion of a pre-forming step; -
FIG. 5B is a cross-sectional view of the blank taken along the line C-C ofFIG. 5A ; -
FIG. 6 is a perspective view of a mold for forming a curved press product according to an example of this disclosure; -
FIG. 7 is a cross-sectional view taken along the line D-D ofFIG. 6 , for illustrating a forming state in the midst of a main forming step according to the example of this disclosure; -
FIG. 8 is a perspective view of the curved press product according to the example of this disclosure in the midst of the main forming step; -
FIG. 9 is a cross-sectional view taken along the line D-D ofFIG. 6 , for illustrating a state after completion of a flange-portion flattening step; -
FIG. 10A is a perspective view of a curved press product according to a second embodiment of this disclosure; -
FIG. 10B is a cross-sectional view of the curved press product taken along the line E-E ofFIG. 10A ; -
FIG. 11A is a perspective view of a blank according to the second embodiment of this disclosure after completion of the pre-forming step; -
FIG. 11B is a cross-sectional view of the blank taken along the line F-F ofFIG. 11A ; -
FIG. 12A is a perspective view of a curved press product according to a third embodiment of this disclosure; -
FIG. 12B is a cross-sectional view of the curved press product taken along the line G-G ofFIG. 12A ; -
FIG. 13A is a perspective view of a blank according to the third embodiment of this disclosure after completion of the pre-forming step; -
FIG. 13B is a cross-sectional view of the blank taken along the line H-H ofFIG. 13A ; -
FIG. 14A is a perspective view of a curved press product according to a fourth embodiment of this disclosure; -
FIG. 14B is a cross-sectional view of the curved press product taken along the line I-I ofFIG. 14A ; -
FIG. 15A is a perspective view of a blank according to the fourth embodiment of this disclosure after completion of the pre-forming step; -
FIG. 15B is a cross-sectional view of the blank taken along the line J-J ofFIG. 15A ; -
FIG. 16A is a perspective view of a blank according to another embodiment of this disclosure; -
FIG. 16B is a cross-sectional view of the blank taken along the line K-K ofFIG. 16A ; -
FIG. 17A is a perspective view of a blank according to the another embodiment of this disclosure after completion of the pre-forming step; -
FIG. 17B is a cross-sectional view of the blank taken along the line L-L ofFIG. 17A ; -
FIG. 18A is a perspective view of a curved press product according to the another embodiment of this disclosure after completion of the flange-portion flattening step; and -
FIG. 18B is a cross-sectional view of the curved press product taken along the line M-M ofFIG. 18A . - In the following, embodiments of this disclosure are described with reference to the drawings. Note that, in each drawing, W represents a width direction, L represents a longitudinal direction, UPR represents an upper side, and LWR represents a lower side. Further, a drawing viewed from the width direction W illustrates a side view, a drawing viewed from the upper side UPR or the lower side LWR illustrates a plan view, and a drawing viewed from the longitudinal direction L illustrates a front view.
- As illustrated in
FIGS. 4A and 4B , a curved press product 1 according to a first embodiment of this disclosure is formed into a hat-like cross-section including: anupper surface portion 3 arranged on the upper side of the curved press product so as to extend in the longitudinal direction L; a pair of right and leftside wall portions 5 each extending from awidthwise edge 3 a of theupper surface portion 3 obliquely downward (in a direction crossing the upper surface portion 3) ; andflange portions 7 bending and extending respectively from lower ends 5 a (edges) of theside wall portions 5 to both right and left sides. - The
widthwise edge 3 a of theupper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view. - A press product forming method according to this embodiment includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- As illustrated in
FIGS. 5A and 5B , the pre-forming step is carried out in such a manner that a highlyrigid portion 9 extending along the longitudinal direction L is formed at each widthwise end portion of a flat plate-like blank (not shown). Specifically, as in a case of a blank 2, the highlyrigid portion 9 includes a bendingportion 11 which is formed through bending a widthwise end portion of the blank 2 obliquely to the upper side UPR (front surface side). In some cases, the bendingportion 11 and abody portion 13 form an angle θ of, for example, approximately 10° to approximately 90°. Further, in some embodiments, the bendingportion 11 is formed into a substantially straight shape in order to prevent occurrence of wrinkles at the time of pre-forming. Note that, after the pre-forming step and before the main forming step, the blank 2 may be heated. - The main forming step is carried out in such a manner that the
upper surface portion 3 and theside wall portions 5 are formed in the heated blank 2 using a mold which is described in detail later. - The flange-portion flattening step is carried out in such a manner that the bending
portion 11 of the highlyrigid portion 9 formed in the pre-forming step is pressed and flattened into the flange portion using the above-mentioned mold. As described above, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank 2 is heated. - After the flange-portion flattening step is finished, the blank is quenched. In this manner, the curved press product 1 that is increased in strength is completed as illustrated in
FIG. 4A . - Next, procedures for forming the curved press product according to the first embodiment using the mold are described in detail.
- As illustrated in
FIG. 6 , amold 21 includes anupper die 23 and alower die 25. Theupper die 23 includes a mountingplate 27 and an upper forming die 29 provided under the mountingplate 27. The upper formingdie 29 is formed into a U-shape in front view, and includes a pair of right and left upper formingsections 31 extending downward, and acoupling section 32 bridging the upper formingsections 31. Further, thelower die 25 includes a mountingplate 33 and a lower formingdie 35 provided on the mountingplate 33. The lower formingdie 35 is formed into a T-shape in front view, and includes flange-portion forming sections 36 provided on right and left sides thereof, and a lower formingsection 37 formed through protruding upward a center portion thereof in a right-left direction. The lower formingsection 37 is fitted between the pair of upper formingsections 31. Further,upper surfaces 36 a of the flange-portion forming sections 36 and anupper surface 37 a of the lower formingsection 37 are formed so as to exhibit a convex shape that bulges to the upper side UPR in side view. Note that, as shown inFIG. 7 ,lower surfaces 31 b of the upper formingsections 31 and alower surface 32 b of thecoupling section 32 are curved so as to conform to theupper surfaces 36 a and theupper surface 37 a of the lower formingdie 35. As described above, themold 21 according to this embodiment is formed of a simply-structured mold (forming mold) which is not provided with a wrinkle prevention device (blank holder) or the like. - As illustrated in
FIG. 7 , in the main forming step, theupper surface portion 3 is formed in the heated blank in such a manner that a widthwise center portion of the blank is brought into contact with the upper surface of the lower formingsection 37, and eachside wall portion 5 is formed in the heated blank in such a manner that each widthwise side region of the blank is sandwiched between aside surface 37 b of the lower formingsection 37 and an inner side surface 31 a of the upper formingsection 31. Here, the bendingportion 11 is formed at each widthwise end portion of the blank along the longitudinal direction. Accordingly, the widthwise end portion of the blank 2 has high rigidity, and thus has high resistance against a force of shrinking the blank in the longitudinal direction. Therefore, an excess material resulting from a curved shape is less likely to cause wrinkles. As a result, as illustrated inFIG. 8 ,wrinkles 40 are less likely to occur in theflange portion 7. Note that, when the upper formingsections 31 are further lowered under the state illustrated inFIG. 7 , as illustrated inFIG. 9 , in the flange-portion flattening step, each bendingportion 11 is pressed by thelower surface 31 b of the upper formingsection 31 and theupper surface 36 a of the flange-portion forming section 36. In this manner, theflat flange portion 7 has less wrinkles and no layers of wrinkles. - In the following, operations and effects of this embodiment are described.
- (1) According to this embodiment, provided is a press product forming method for press-forming the curved press product 1. The curved press product 1 is formed into a hat-like cross-section including: the
upper surface portion 3; theside wall portions 5 each bending and extending from thewidthwise edge 3 a of theupper surface portion 3 in a direction crossing theupper surface portion 3; and theflange portions 7 each bending and extending from the edge 5 a of each of theside wall portions 5. Thewidthwise edge 3 a of theupper surface portion 3 is shaped so as to curve and extend along the longitudinal direction L. - Further, the press product forming method includes: the pre-forming step of forming, at the widthwise end portion of the flat plate-like blank, each bending portion 11 (highly rigid portion 9) extending along the longitudinal direction; and the main forming step of forming the
upper surface portion 3 and theside wall portions 5 under a state in which each highlyrigid portion 9 is left. - As described above, in the press product forming method according to this embodiment, the
upper surface portion 3 and theside wall portions 5 are formed under the state in which each bendingportion 11 extending along the longitudinal direction is left. Accordingly, each widthwise end portion of the blank 2 is increased in rigidity, and is increased in resistance against the force of shrinking the blank in the longitudinal direction. Therefore, at the time of forming theupper surface portion 3 and theside wall portions 5, even when the excess material resulting from the curved shape causes action of the force of shrinking the blank in the longitudinal direction, it is possible to prevent or minimize the occurrence of forming defects, such as wrinkles and layers of wrinkles, in theflange portions 7. - (2) Each highly
rigid portion 9 includes the bendingportion 11 formed through bending the widthwise end portion of the blank 2 obliquely to the front surface side, and hence it is possible to increase rigidity of the widthwise end portion of the blank 2. - (3) The press product forming method according to this embodiment further includes the flange-portion flattening step of pressing and flattening the bending portions 11 (highly rigid portions 9) into the
flange portions 7 as illustrated inFIG. 9 . Accordingly, it is possible to prevent occurrence of wrinkles in theflange portions 7, and to form theflat flange portions 7. In other embodiments, the flange-portion flattening step is not necessary. - (4) The main forming step and the flange-portion flattening step may be carried out by hot press forming. This further increases the significance of forming the bending
portion 11 at each widthwise end portion of the blank 2 so as to increase rigidity of the widthwise end portion. That is, in a case of cold press forming, the blank itself has higher rigidity than in a case of hot press forming. Accordingly, in the case of application of the force of shrinking the blank in the longitudinal direction, or at the time of forming the flange portions, wrinkles and layers of wrinkles are less likely to occur in theflange portions 7. On the other hand, in the case of hot press forming, the blank itself has lower rigidity than in the case of cold press forming. Accordingly, in the case of application of the force of shrinking the blank in the longitudinal direction, or at the time of forming the flange portions, wrinkles and layers of wrinkles are more likely to occur in theflange portions 7. Therefore, the bendingportion 11 is formed at the widthwise end portion of the blank 2 to thereby increase rigidity of the widthwise end portion. In this manner, it is possible to effectively prevent occurrence of wrinkles and layers of wrinkles. - Next, a second embodiment of this disclosure is described. The same components as those of the first embodiment are denoted by the same reference symbols, and description thereof is omitted.
- In the curved press product 1 according to the first embodiment, the
widthwise edge 3 a of theupper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view. - However, as illustrated in
FIG. 10A , in acurved press product 51 according to the second embodiment, an inner curvedwidthwise edge 53 a and an outer curvedwidthwise edge 53 b of anupper surface portion 53 are each formed into an arc shape that curves along the longitudinal direction L in plan view. Note that a cross-sectional shape illustrated inFIG. 10B is the same as that of the first embodiment illustrated inFIG. 4B , and thecurved press product 51 is formed into a hat-like cross-section including theupper surface portion 53,side wall portions 55, andflange portions 57. Further, of theflange portions 57, an inner curved flange portion is denoted by 57 a, and an outer curved flange portion is denoted by 57 b. - Similarly to the first embodiment, a press product forming method according to this embodiment includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- As illustrated in
FIGS. 11A and 11B , the pre-forming step is carried out in such a manner that a highlyrigid portion 9A extending along the longitudinal direction is formed at one of widthwise end portions of a flat plate-like blank (not shown). Specifically, as in a case of a blank 52, the highlyrigid portion 9A includes a bendingportion 58 which is formed through bending a left widthwise end portion of the blank 52 obliquely to the upper side (front surface side). In some cases, the bendingportion 58 and abody portion 59 form an angle θ of, for example, approximately 10° to approximately 90°. Further, the bendingportion 58 is provided in an outer curved region of thecurved press product 51 in plan view. Still further, the bendingportion 58 may be formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step. - The main forming step and the flange-portion flattening step are the same as those of the first embodiment. Note that, similarly to the above-mentioned first embodiment, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- In particular, rigidity of the widthwise end portion is increased in such a manner that the bending
portion 58 is formed at the widthwise end portion corresponding to the outercurved flange portion 57 b in which wrinkles are more likely to occur. Thus, it is possible to effectively prevent occurrence of wrinkles and layers of wrinkles in the outercurved flange portion 57 b. - Next, a third embodiment of this disclosure is described. The same components as those of the first and second embodiments are denoted by the same reference symbols, and description thereof is omitted.
- As illustrated in
FIGS. 12A and 12B , acurved press product 61 according to the third embodiment has the same shape as that of the curved press product 1 according to the first embodiment. That is, thecurved press product 61 is formed into a hat-like cross-section including anupper surface portion 3,side wall portions 5, andflange portions 7. Further, awidthwise edge 3 a of theupper surface portion 3 is formed into a convex shape that bulges to the upper side UPR along the longitudinal direction L in side view. - Similarly to the first and second embodiments, a press product forming method according to this embodiment includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- As illustrated in
FIGS. 13A and 13B , the pre-forming step is carried out in such a manner that triangular ridges 63 (ridges) functioning as highlyrigid portions 9B and extending along the longitudinal direction are formed respectively at both widthwise end portions of a flat plate-like blank (not shown). Specifically, as in a case of a blank 62, both the widthwise end portions of the flat plate-like blank are protruded to the upper side (front surface side), to thereby form theridges 63 each having a dogleg cross-section protruding upward. Further, in some cases, each of theridges 63 is formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step. - The main forming step and the flange-portion flattening step are the same as those of the first and second embodiments. Note that, similarly to the above-mentioned first and second embodiments, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- In particular, the
triangular ridges 63 are formed respectively at the widthwise end portions of the blank 62, and thus rigidity of the widthwise end portions is increased. Accordingly, the highlyrigid portions 9B can effectively prevent occurrence of wrinkles and layers of wrinkles in theflange portions 7. - Next, a fourth embodiment of this disclosure is described. The same components as those of the first to third embodiments are denoted by the same reference symbols, and description thereof is omitted.
- A
curved press product 71 according to the fourth embodiment has the same shape as that of thecurved press product 51 according to the second embodiment. That is, as illustrated inFIGS. 14A and 14B, thecurved press product 71 is formed into a hat-like cross-section including anupper surface portion 53,side wall portions 55, andflange portions 57. Further, of theflange portions 57, an inner curved flange portion is denoted by 57 a, and an outer curved flange portion is denoted by 57 b. An inner curved widthwiseedge 53 a and an outer curvedwidthwise edge 53 b of theupper surface portion 53 are each formed into an arc shape that curves along the longitudinal direction L in plan view. - Similarly to the first to third embodiments, a press product forming method according to this embodiment includes a pre-forming step, a main forming step, and a flange-portion flattening step.
- As illustrated in
FIGS. 15A and 15B , the pre-forming step is carried out in such a manner that a triangular ridge 73 (ridge) functioning as a highlyrigid portion 9C and extending along the longitudinal direction L is formed at one of widthwise end portions of a flat plate-like blank (not shown). Specifically, as in a case of a blank 72, one of the widthwise end portions of the flat plate-like blank is protruded to the upper side (front surface side), to thereby form theridge 73 having a dogleg cross-section protruding to the upper side UPR. Further, thetriangular ridge 73 is provided in an outer curved region of thecurved press product 71 in plan view. Still further, in some cases, theridge 73 is formed into a straight shape in order to prevent occurrence of wrinkles at the time of the pre-forming step. - The main forming step and the flange-portion flattening step are the same as those of the first to third embodiments. Note that, similarly to the above-mentioned first to third embodiments, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated.
- In particular, the
triangular ridge 73 is formed at the widthwise end portion of the blank 72, and thus rigidity of the widthwise end portion is increased. Accordingly, the highlyrigid portion 9C can effectively prevent occurrence of wrinkles and layers of wrinkles in the outercurved flange portion 57 b. - Next, forming steps according to another embodiment of this disclosure are described step by step. Here, a case of forming a center pillar is described by way of example.
- First, a flat plate-like blank 90 is formed of a flat steel plate extending in an elongated manner as illustrated in
FIGS. 16A and 16B , and includes a longitudinal center portion 93 having a relatively large width. - Next, in a pre-forming step, a bending portion 95 (highly
rigid portion 9D shown inFIG. 17A ) is formed in such a manner that each widthwise end portion of the longitudinal center portion 93 of the flat plate-like blank 90 is bent obliquely to the upper side (front surface side). Thus, the blank 90 is formed into a blank 91 illustrated inFIGS. 17A and 17B . - Then, as illustrated in
FIGS. 18A and 18B , after anupper surface portion 96 andside wall portions 97 are formed in the heated blank 91 in a main forming step under a state in which the bendingportions 95 are left, the bendingportions 95 are pressed and flattened intoflange portions 98 in a flange-portion flattening step. The blank 91 is then quenched so as to be increased in strength. Thus, acenter pillar 99 according to this embodiment is completed. Note that, similarly to the above-mentioned first to fourth embodiments, the main forming step and the flange-portion flattening step may be carried out by hot press forming under a state in which the blank is heated. - As described above, according to this embodiment, even in a case where the highly
rigid portions 9D are formed in a part of the longitudinal portion of the blank 91, it is possible to effectively prevent occurrence of wrinkles and layers of wrinkles in theflange portions 98. - The first to fourth embodiments and another embodiment of this disclosure are described above, but this disclosure is not limited thereto. Various modifications and changes can be made thereto.
- For example, in the first to fourth embodiments and another embodiment, the bending portion is extended obliquely to the upper side (front surface side), but may be extended to the lower side (back surface side).
- Further, regarding the ridge, a shape other than the triangular ridge is also applicable. However, in order to prevent a layered portion from being formed in a ridge when pressing the ridge in the flange-portion flattening step, a ridge having a ridge line, such as the triangular ridge, is preferred.
- In addition, in the above-mentioned embodiments, the highly
rigid portions 9 to 9C are pressed and flattened, but the highlyrigid portions 9 to 9C may be left unpressed and unflattened in the obtained products. - Further, the press forming according to this disclosure may include cold press forming which does not require heating of a blank and quenching performed after forming.
Claims (18)
1. A press product forming method for press-forming a curved press product,
the curved press product being formed into a hat-like cross-section including:
an upper surface portion;
side wall portions each bending and extending from a widthwise edge of the upper surface portion in a direction crossing the upper surface portion; and
flange portions each bending and extending from an edge of each of the side wall portions,
the widthwise edge of the upper surface portion being shaped so as to curve and extend along a longitudinal direction,
the press product forming method comprising:
a pre-forming step of forming, at a widthwise end portion of a flat plate-like blank, a highly rigid portion extending along the longitudinal direction; and
a main forming step of forming the upper surface portion and the side wall portions under a state in which the highly rigid portion is left.
2. A press product forming method according to claim 1 , wherein the main forming step is carried out by hot press forming.
3. A press product forming method according to claim 1 , further comprising a flange-portion flattening step of pressing and flattening the highly rigid portion into one of the flange portions.
4. A press product forming method according to claim 3 , wherein the main forming step is carried out by hot press forming.
5. A press product forming method according to claim 1 , wherein the highly rigid portion comprises at least one of:
a ridge which protrudes to at least one of a front surface side and a back surface side of the flat plate-like blank; and
a bending portion which is formed through bending the widthwise end portion of the flat plate-like blank obliquely to at least one of the front surface side and the back surface side of the flat plate-like blank.
6. A press product forming method according to claim 5 , wherein the main forming step is carried out by hot press forming.
7. A press product forming method according to claim 5 , further comprising a flange-portion flattening step of pressing and flattening the highly rigid portion into one of the flange portions.
8. A press product forming method according to claim 7 , wherein the main forming step is carried out by hot press forming.
9. A press product forming method comprising:
providing a substantially flat plate-like blank;
pre-forming the blank to create at least one bending portion at or near a widthwise end portion of the blank, the at least one bending portion extending along a longitudinal direction of the blank;
forming the pre-formed blank into a curved press comprising a hat-like cross-section including:
an upper surface portion;
side wall portions each bending and extending from a widthwise edge of the upper surface portion at an angle from the upper surface portion; and
flange portions each bending and extending from an edge of each of the side wall portions,
the widthwise edge of the upper surface portion curving and extending along the longitudinal direction,
wherein the step of forming the pre-formed blank into the curved press is such that the upper surface portion and the side wall portions are formed while the at least one bending portion remains intact.
10. The method of claim 9 , wherein the step of forming the pre-formed blank into the curved press comprises hot press forming.
11. The method of claim 9 , further comprising pressing and flattening the at least one bending portion into one of the flange portions.
12. The method of claim 11 , wherein the step of forming the pre-formed blank into the curved press comprises hot press forming.
13. The method of claim 9 , wherein the at least one bending portion comprises at least one of:
a ridge which protrudes from at least one of a front surface side and a back surface side of the flat plate-like blank; and
a bent flange formed by bending the widthwise end portion of the flat plate-like blank obliquely relative to at least one of the front surface side and the back surface side of the flat plate-like blank.
14. The method of claim 13 , wherein the step of forming the pre-formed blank into the curved press comprises hot press forming.
15. The method of claim 13 , further comprising pressing and flattening the at least one bending portion into one of the flange portions.
16. The method of claim 13 , wherein the ridge is triangular in cross-section.
17. The method of claim 9 , wherein the step of pre-forming the blank comprises creating at least two bending portions, with a first bending portion extending along the longitudinal direction of the blank at a first widthwise end portion of the blank and the a second bending portion extending along the longitudinal direction of the blank at a second widthwise end portion of the blank.
18. The method of claim 13 , wherein the bent flange extends from the at least one of the front surface side and the back surface side at an angle between approximately 10° and approximately 90°.
Applications Claiming Priority (2)
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JP2012035781A JP5965159B2 (en) | 2012-02-22 | 2012-02-22 | Molding method for press parts |
JP2012-035781 | 2012-02-22 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN103639257A (en) * | 2013-12-29 | 2014-03-19 | 哈尔滨工业大学 | Device for performing double curvature sheet bending and forming by utilizing electronic universal testing machine |
CN106660098A (en) * | 2014-07-30 | 2017-05-10 | 杰富意钢铁株式会社 | Press forming method |
US10220428B2 (en) | 2013-12-20 | 2019-03-05 | Jfc Steel Corporation | Press forming method, and method for manufacturing press-formed part |
US10252312B2 (en) | 2015-04-22 | 2019-04-09 | Nippon Steel & Sumitomo Metal Corporation | Pressed component manufacturing method, pressed component, mold, and press apparatus |
EP3287205A4 (en) * | 2015-04-22 | 2019-05-01 | Nippon Steel & Sumitomo Metal Corporation | Method for producing press-molded product, press-molded product, and pressing device |
US10444732B2 (en) | 2015-03-27 | 2019-10-15 | Nippon Steel Corporation | Blank shape determining method, blank, press formed product, press forming method, computer program, and recording medium |
US10639695B2 (en) | 2014-01-28 | 2020-05-05 | Jfe Steel Corporation | Press forming method, method for manufacturing press-formed component and method for determining preform shape used in these methods |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5174146A (en) * | 1990-04-03 | 1992-12-29 | Sollac | Method and device for forming a part in relief on a sheet metal blank |
US6196043B1 (en) * | 1999-08-27 | 2001-03-06 | General Motors Corporation | Double vee lockbead for sheet metal forming |
US20010052255A1 (en) * | 2000-06-16 | 2001-12-20 | Kenichi Arai | Press forming process and product formed thereby with high dimensional accuracy, and workpiece used therefor |
US20040244458A1 (en) * | 2003-06-04 | 2004-12-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.) | Die set for press forming metal sheet and press forming method of metal sheet |
US20050262917A1 (en) * | 2004-06-01 | 2005-12-01 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Bent-forming method |
US20070180697A1 (en) * | 2006-02-08 | 2007-08-09 | Benteler Automobiltechnik Gmbh | Structural or chassis component for a motor vehicle, and method of making such a structural or chassis component |
US7806024B1 (en) * | 2008-02-20 | 2010-10-05 | Forest Hill Manufacturing, Llc | Method for making shovel |
US20110252856A1 (en) * | 2010-04-14 | 2011-10-20 | Honda Motor Co., Ltd. | Hot press forming method |
US20120279273A1 (en) * | 2011-05-02 | 2012-11-08 | Honda Motor Co., Ltd. | Manufacturing method of press product and press forming apparatus |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1190534A (en) * | 1997-09-18 | 1999-04-06 | Pacific Ind Co Ltd | Formation of arched press forming product excellent in shape-freezability |
JP3572950B2 (en) * | 1998-07-29 | 2004-10-06 | 住友金属工業株式会社 | Press forming method and apparatus |
JP2004154839A (en) * | 2002-11-07 | 2004-06-03 | Ricoh Co Ltd | Metallic member with bent flange and processing metal die structure thereof |
JP3864899B2 (en) * | 2002-12-05 | 2007-01-10 | Jfeスチール株式会社 | Press working method with excellent shape freezing property and processing tool used therefor |
CN100388987C (en) * | 2006-02-13 | 2008-05-21 | 安徽江淮汽车股份有限公司 | Composite punching die for plate formation |
JP2008042635A (en) * | 2006-08-08 | 2008-02-21 | Hitachi Ltd | Device management server, device to be managed, communication device, recording medium, apparatus restoration method, apparatus restoration program |
JP5073413B2 (en) * | 2007-08-21 | 2012-11-14 | 本田技研工業株式会社 | Press mold |
JP2009241109A (en) * | 2008-03-31 | 2009-10-22 | Kobe Steel Ltd | Bend-forming method of channel member |
JP5151784B2 (en) * | 2008-08-05 | 2013-02-27 | 新日鐵住金株式会社 | Center pillar outer panel manufacturing method and center pillar outer panel blank |
JP2010227995A (en) * | 2009-03-30 | 2010-10-14 | Kobe Steel Ltd | Method of forming curved channel member |
JP2011050971A (en) * | 2009-08-31 | 2011-03-17 | Jfe Steel Corp | Method of hot press-forming steel sheet |
JP2011206789A (en) * | 2010-03-29 | 2011-10-20 | Kobe Steel Ltd | Press forming method |
-
2012
- 2012-02-22 JP JP2012035781A patent/JP5965159B2/en active Active
- 2012-12-19 US US13/719,764 patent/US20130213109A1/en not_active Abandoned
- 2012-12-28 CN CN201210589587.5A patent/CN103286185B/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5174146A (en) * | 1990-04-03 | 1992-12-29 | Sollac | Method and device for forming a part in relief on a sheet metal blank |
US6196043B1 (en) * | 1999-08-27 | 2001-03-06 | General Motors Corporation | Double vee lockbead for sheet metal forming |
US20010052255A1 (en) * | 2000-06-16 | 2001-12-20 | Kenichi Arai | Press forming process and product formed thereby with high dimensional accuracy, and workpiece used therefor |
US20040244458A1 (en) * | 2003-06-04 | 2004-12-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.) | Die set for press forming metal sheet and press forming method of metal sheet |
US20050262917A1 (en) * | 2004-06-01 | 2005-12-01 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Bent-forming method |
US20070180697A1 (en) * | 2006-02-08 | 2007-08-09 | Benteler Automobiltechnik Gmbh | Structural or chassis component for a motor vehicle, and method of making such a structural or chassis component |
US7806024B1 (en) * | 2008-02-20 | 2010-10-05 | Forest Hill Manufacturing, Llc | Method for making shovel |
US20110252856A1 (en) * | 2010-04-14 | 2011-10-20 | Honda Motor Co., Ltd. | Hot press forming method |
US20120279273A1 (en) * | 2011-05-02 | 2012-11-08 | Honda Motor Co., Ltd. | Manufacturing method of press product and press forming apparatus |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10220428B2 (en) | 2013-12-20 | 2019-03-05 | Jfc Steel Corporation | Press forming method, and method for manufacturing press-formed part |
CN103639257A (en) * | 2013-12-29 | 2014-03-19 | 哈尔滨工业大学 | Device for performing double curvature sheet bending and forming by utilizing electronic universal testing machine |
US10639695B2 (en) | 2014-01-28 | 2020-05-05 | Jfe Steel Corporation | Press forming method, method for manufacturing press-formed component and method for determining preform shape used in these methods |
CN106660098A (en) * | 2014-07-30 | 2017-05-10 | 杰富意钢铁株式会社 | Press forming method |
US10444732B2 (en) | 2015-03-27 | 2019-10-15 | Nippon Steel Corporation | Blank shape determining method, blank, press formed product, press forming method, computer program, and recording medium |
US10252312B2 (en) | 2015-04-22 | 2019-04-09 | Nippon Steel & Sumitomo Metal Corporation | Pressed component manufacturing method, pressed component, mold, and press apparatus |
EP3287205A4 (en) * | 2015-04-22 | 2019-05-01 | Nippon Steel & Sumitomo Metal Corporation | Method for producing press-molded product, press-molded product, and pressing device |
US11097331B2 (en) | 2015-06-01 | 2021-08-24 | Nippon Steel Corporation | Press-formed article, press-forming method, and press-forming apparatus |
US11806773B2 (en) | 2015-06-01 | 2023-11-07 | Nippon Steel Corporation | Press-formed article, press-forming method, and press-forming apparatus |
US10758959B2 (en) * | 2015-09-18 | 2020-09-01 | Nippon Steel Corporation | Panel-like formed product and manufacturing method thereof |
US11608925B2 (en) * | 2016-03-10 | 2023-03-21 | Mueller International, Llc | Tapping sleeve with bent ends |
CN113286672A (en) * | 2019-01-11 | 2021-08-20 | 杰富意钢铁株式会社 | Press forming method, blanking of plate-like material, intermediate formed article, method for producing press formed article, and press formed article |
US11998968B2 (en) | 2019-04-22 | 2024-06-04 | Jfe Steel Corporation | Press forming method |
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CN103286185B (en) | 2017-09-08 |
JP5965159B2 (en) | 2016-08-03 |
CN103286185A (en) | 2013-09-11 |
JP2013169578A (en) | 2013-09-02 |
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