US20130213109A1 - Press product forming method - Google Patents

Press product forming method Download PDF

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Publication number
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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United States
Prior art keywords
forming
blank
press
bending
press product
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Abandoned
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US13/719,764
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English (en)
Inventor
Kenichi Ogasawara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Topre Corp
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Topre Corp
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Assigned to TOPRE CORPORATION reassignment TOPRE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OGASAWARA, KENICHI
Publication of US20130213109A1 publication Critical patent/US20130213109A1/en
Abandoned legal-status Critical Current

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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
    • 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.
US13/719,764 2012-02-22 2012-12-19 Press product forming method Abandoned US20130213109A1 (en)

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Application Number Priority Date Filing Date Title
JP2012035781A JP5965159B2 (ja) 2012-02-22 2012-02-22 プレス部品の成形方法
JP2012-035781 2012-02-22

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JP6677289B1 (ja) 2018-12-12 2020-04-08 Ｊｆｅスチール株式会社 プレス成形方法
JP6733772B1 (ja) 2019-04-22 2020-08-05 Ｊｆｅスチール株式会社 プレス成形方法
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