WO2017141603A1 - プレス成形品の製造方法 - Google Patents

プレス成形品の製造方法 Download PDF

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Publication number
WO2017141603A1
WO2017141603A1 PCT/JP2017/001210 JP2017001210W WO2017141603A1 WO 2017141603 A1 WO2017141603 A1 WO 2017141603A1 JP 2017001210 W JP2017001210 W JP 2017001210W WO 2017141603 A1 WO2017141603 A1 WO 2017141603A1
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WO
WIPO (PCT)
Prior art keywords
press
top plate
continuous
molding
shape
Prior art date
Application number
PCT/JP2017/001210
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隼佑 飛田
新宮　豊久
雄司 山▲崎▼
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020187022684A priority Critical patent/KR102083108B1/ko
Priority to JP2017523937A priority patent/JP6176429B1/ja
Priority to CN201780010977.3A priority patent/CN108698104B/zh
Priority to MX2018009884A priority patent/MX369682B/es
Publication of WO2017141603A1 publication Critical patent/WO2017141603A1/ja

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Classifications

    • 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
    • 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
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments

Definitions

  • the present invention relates to a technique for producing a press-molded product by press-molding a metal plate into a product shape having a hat-shaped cross section having a top plate portion and a flange portion that are curved along the longitudinal direction.
  • the present invention relates to a technique that is effective when a metal plate is press-molded into a product shape having a vertical wall portion rising on the top plate portion side.
  • high-tensile materials of 590 MPa or higher have been applied to vehicle body structural parts in order to achieve both improved collision safety and weight reduction of automobile bodies. Since high tensile strength materials of 590 MPa or higher have high yield strength and tensile strength, defective molding such as springback becomes a problem when performing press molding.
  • One of the press-formed products used for vehicle body structural parts is a B-pillar outer. Such parts include a top plate portion and a flange portion having a curved portion curved to the top plate portion side with a predetermined curvature radius in the longitudinal direction, and a vertical wall portion connecting the top plate portion and the flange portion on the longitudinal end portion side.
  • Patent Document 1 As conventional techniques for suppressing such springback, there are techniques described in Patent Document 1 and Patent Document 2.
  • the press molding method described in Patent Document 1 is a method of molding a press molded product having a curved shape in a longitudinal plane.
  • the curvature radius of at least one curved portion of the plurality of curved portions formed in the press-molded product is set to be smaller than the curvature radius of the final product in the first molding step. It shape
  • the press forming method described in Patent Document 2 is a method of forming into a press-formed product having a U-shaped or hat-shaped cross section and a shape curved in the longitudinal direction.
  • molding is performed with the same curvature as the product shape and a smaller width than the product shape in the first molding step, and larger than the width in the first molding step in the second molding step. Mold without changing the radius. Accordingly, in Patent Document 2, the springback is suppressed by canceling the stress generated in the first molding process with the stress generated in the second molding process.
  • An object of the present invention is to provide a production method capable of producing a press-formed product having excellent shape freezing property.
  • the top plate portion and the flange portion are continuous in the width direction via the side wall portion, and the top plate portion and the flange portion are in the longitudinal direction. Is curved so as to be convex toward the top plate portion side, and a projecting portion having a dimension in the width direction larger than that of the top plate portion is continuous with a longitudinal end portion of the top plate portion.
  • the metal plate When the metal plate is press-molded and manufactured into a product shape having a vertical wall portion that rises to the top plate portion side continuously from the longitudinal end portion and the upper end continues to the overhang portion, the flange portion
  • the method of the present invention is excellent in shape freezing property.
  • a component with high dimensional accuracy is obtained, which leads to an improvement in yield.
  • FIG. It is the schematic explaining the springback in hat-shaped cross-section components. It is a schematic diagram which shows the product shape which concerns on embodiment based on this invention, (a) is a perspective view, (b) is a side view. It is a figure which shows the process of the manufacturing method of the press-formed product which concerns on embodiment based on this invention. It is a conceptual diagram when it sees from the side which shows the relationship between a flange part and a vertical wall part for demonstrating a continuous part, (a) is a whole figure, (b) is a continuous part in the whole figure. FIG. It is a figure which shows the stress distribution which analyzed the state after a 1st process.
  • the press-forming of the main forming (second step) is performed.
  • the product shape manufactured by the press molding intended by the present embodiment includes a main body portion 4 and an overhang portion 5 formed at a longitudinal end portion of the main body portion 4.
  • the main body portion 4 has a top plate portion 1 and a flange portion 2 that are continuous in the width direction through the side wall portion 3 and is a hat-shaped cross-section component, and the top plate portion 1 and the flange portion 2 are in the longitudinal direction.
  • a curved shape is formed so as to protrude toward the top plate portion 1 side.
  • the overhang portion 5 is formed continuously at both longitudinal ends of the top plate portion 1. Since the width of each overhang portion 5 is larger in the width direction than the width of the top plate portion 1, the top plate surface on the end side in the longitudinal direction of the product shape in the top view is L-shaped or T-shaped. It has become.
  • FIG. 2 illustrates the case of a T shape.
  • the lower end portion of the vertical wall portion 6 is continuous with the longitudinal end portion of the flange portion 2.
  • the vertical wall portion 6 rises to the top plate portion 1 side, and its upper end continues to the overhang portion 5.
  • the main body 4 having a curved portion extends in the vertical direction with respect to the vertical wall 6.
  • the vertical wall portion 6 rises so as to face the longitudinal direction of the main body portion 4.
  • a shape in which the vertical wall portion 6 exists only on one side in the longitudinal direction may be used.
  • the vertical wall portion 6 exists only on one side in the width direction, or one of the vertical wall portions 6 is not connected to the overhang portion 5.
  • the manufacturing method of the press-molded product of this embodiment is as shown in FIG. 3 as a process for forming a metal plate into the above product shape, as shown in FIG. 2 steps).
  • the pressing process for manufacturing a press-formed product into a multi-step process of two stages, it is possible to improve the dimensional accuracy such as suppressing the spring back of the product.
  • it has trim processing (not shown) which trims the flange outer periphery.
  • the trim processing may be performed before the first step, may be performed between the first step and the second step, or may be performed after the second step.
  • the intermediate part is a part in a state where trimming of the outer periphery of the flange is performed.
  • the first step is the same part shape as the target product shape, except that the line length of the continuous portion between the longitudinal end of the flange part 2 and the vertical wall part 6 is shorter than the line length in the product shape.
  • This is a step of preforming the material.
  • the preforming for shortening the line length may be applied to both end portions.
  • Preliminary molding may be performed so that the line length is shortened only at the end in the longitudinal direction on the side where the influence of distortion due to bending is large.
  • FIG. 4 is a view schematically showing profiles of the flange portion 2, the vertical wall portion 6, and the overhang portion 5 in a side view.
  • the continuous portion represents the connecting portion S of the flange portion 2 and the vertical wall portion 6 and the positions before and after the connecting portion S.
  • the continuous portion includes at least a part of the longitudinal end portion of the flange portion 2 continuous to the connecting portion S. It is.
  • molding in the 1st process is shown by L2
  • molding in the 2nd process of a corresponding position is shown by L1.
  • the wire length of the continuous portion is set to be short by increasing the radius (curvature radius) at the connection portion S at the time of preforming.
  • the alternate long and short dash line indicates the shape after the second step, and in FIG. 4B, L1 and L2 indicate the position and length (line length) of the continuous portion.
  • the preliminary molding in the first step may be performed by, for example, draw molding or foam molding.
  • the trim processing of a flange outer periphery is given.
  • a known processing method such as shearing or laser cutting may be employed.
  • the second step is a main forming step in which the part shape preformed in the first step is press-molded into a target product shape.
  • the molding into the product shape in the second step may be performed by, for example, a re-striking process that is a known processing method.
  • the continuous end portion connecting the longitudinal end portion of the flange portion 2 and the vertical wall portion 6 intersecting the end portion of the flange portion 2 is connected.
  • the wire length of the portion is formed to be shorter than the wire length in the product, and in the second step, the part shape obtained in the first step is formed into the product shape to produce a desired press-formed product.
  • tensile_strength is added with respect to the flange part 2 at a 2nd process, and the compressive stress of the flange part 2 reduces.
  • the freezing property of the product shape is improved, and the spring back after press molding can be suppressed.
  • the manufacturing method of the press-formed product of the present embodiment is suitable when a high-tensile material of 590 MPa or more is targeted as a metal plate, but a steel plate, an aluminum plate, or the like may be used as the metal plate.
  • the line length of the continuous portion is shortened with respect to the product shape in the preforming (first step), there is an effect of suppressing the springback, but the line length to be shortened may be obtained as follows, for example.
  • simulation analysis CAE analysis such as stress analysis
  • the longitudinal line length Lo in the longitudinal compressive stress region generated in the curved portion of the flange portion 2 is A longitudinal average strain amount ⁇ o is obtained.
  • FIG. 5 shows a schematic diagram of a longitudinal compressive stress distribution generated in the flange portion 2 at the bottom dead center when the metal plate is press-formed into a target product shape.
  • the hatched position is a region where a compressive stress of a predetermined level or more is generated.
  • the longitudinal compressive stress region is a compressive stress region including the apex of the curve, and is a longitudinal region where compressive stress is generated.
  • preforming is performed into a part shape in which the line length of the continuous portion between the longitudinal end portion of the flange portion 2 and the vertical wall portion 6 is shortened.
  • the spring back of the hat-shaped cross-sectional component curved in the longitudinal direction can be reduced.
  • it is possible to obtain a pressed part having a product shape with a highly accurate hat-shaped cross section close to the target part shape and having a curvature in the longitudinal direction. are better.
  • a part with high dimensional accuracy is obtained, which leads to an improvement in yield.
  • when using a hat-shaped cross-sectional part to make a vehicle body structural part it is possible to easily assemble the part.
  • press forming analysis and spring back analysis by a finite element method were performed.
  • FEM finite element method
  • the radius of curvature for forming the continuous portion of the die of the mold used in the first step is larger in radius of curvature than the shape of the round of forming the continuous portion of the die of the mold used in the second step.
  • the condition is that the metal plate is press-formed into a product shape only in the second step without performing the first step.
  • Table 1 summarizes the press molding conditions and evaluation results.
  • the maximum springback amount is 4 for a 1470 MPa material. Reduced to 1 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
PCT/JP2017/001210 2016-02-16 2017-01-16 プレス成形品の製造方法 WO2017141603A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020187022684A KR102083108B1 (ko) 2016-02-16 2017-01-16 프레스 성형품의 제조 방법
JP2017523937A JP6176429B1 (ja) 2016-02-16 2017-01-16 プレス成形品の製造方法
CN201780010977.3A CN108698104B (zh) 2016-02-16 2017-01-16 冲压成型品的制造方法
MX2018009884A MX369682B (es) 2016-02-16 2017-01-16 Metodo de fabricacion de miembro estampado.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-027116 2016-02-16
JP2016027116 2016-02-16

Publications (1)

Publication Number Publication Date
WO2017141603A1 true WO2017141603A1 (ja) 2017-08-24

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PCT/JP2017/001210 WO2017141603A1 (ja) 2016-02-16 2017-01-16 プレス成形品の製造方法

Country Status (4)

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KR (1) KR102083108B1 (es)
CN (1) CN108698104B (es)
MX (1) MX369682B (es)
WO (1) WO2017141603A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031248A1 (ja) * 2017-08-07 2019-02-14 Ｊｆｅスチール株式会社 プレス成形品の製造方法
JP2020124717A (ja) * 2019-02-01 2020-08-20 Ｊｆｅスチール株式会社 プレス成形方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020158478A1 (ja) * 2019-01-31 2020-08-06 Ｊｆｅスチール株式会社 プレス部品の製造方法及びブランク材の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007118014A (ja) * 2005-10-26 2007-05-17 Nissan Motor Co Ltd プレス成形方法およびプレス成形装置
JP2010036217A (ja) * 2008-08-05 2010-02-18 Sumitomo Metal Ind Ltd センターピラーアウターパネルの製造方法およびセンターピラーアウターパネル用ブランク
JP2016002560A (ja) * 2014-06-16 2016-01-12 Ｊｆｅスチール株式会社 冷間プレス成形方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4757820B2 (ja) 2007-03-14 2011-08-24 新日本製鐵株式会社 形状凍結性に優れる多段プレス成形方法
JP5031703B2 (ja) 2008-09-12 2012-09-26 新日本製鐵株式会社 形状凍結性に優れる多段プレス成形方法
JP2011206789A (ja) * 2010-03-29 2011-10-20 Kobe Steel Ltd プレス成形方法
JP5962774B2 (ja) * 2013-01-07 2016-08-03 新日鐵住金株式会社 プレス成形品の製造方法
JP5949719B2 (ja) * 2013-10-03 2016-07-13 Ｊｆｅスチール株式会社 スプリングバック量評価方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007118014A (ja) * 2005-10-26 2007-05-17 Nissan Motor Co Ltd プレス成形方法およびプレス成形装置
JP2010036217A (ja) * 2008-08-05 2010-02-18 Sumitomo Metal Ind Ltd センターピラーアウターパネルの製造方法およびセンターピラーアウターパネル用ブランク
JP2016002560A (ja) * 2014-06-16 2016-01-12 Ｊｆｅスチール株式会社 冷間プレス成形方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031248A1 (ja) * 2017-08-07 2019-02-14 Ｊｆｅスチール株式会社 プレス成形品の製造方法
US11260443B2 (en) 2017-08-07 2022-03-01 Jfe Steel Corporation Method for manufacturing press formed product
JP2020124717A (ja) * 2019-02-01 2020-08-20 Ｊｆｅスチール株式会社 プレス成形方法
JP7001073B2 (ja) 2019-02-01 2022-01-19 Ｊｆｅスチール株式会社 プレス成形方法

Also Published As

Publication number Publication date
KR102083108B1 (ko) 2020-02-28
CN108698104A (zh) 2018-10-23
MX2018009884A (es) 2018-11-09
KR20180102607A (ko) 2018-09-17
CN108698104B (zh) 2019-12-06
MX369682B (es) 2019-11-15

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