Rigidity improvement method for press-formed product, press-forming die, press-formed product, and method of producing press-formed product

Patent metadata

Field	Value
Publication number	US-2021237137-A1
Application number	US-201917042069-A
Country	US
Kind code	A1
Filing date	Feb 25, 2019
Priority date	Mar 28, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

To suppress springback of the press-formed product, in improving rigidity of a press-formed product having a low rigidity shape produced by press-forming a sheet material by a rigidity adding shape to suppress springback at a time when the press-formed product is removed from a die, the rigidity adding shape is arranged to extend in a direction of crossing a displacement contour indicating a state of springback in an initial shape prior to an arrangement of the rigidity adding shape of the press-formed product.

First claim

1 .- 16 . (canceled)

17 . A rigidity improvement method for a press-formed product,
wherein, in improving rigidity of a press-formed product produced by press-forming a sheet material by a rigidity adding shape, to suppress springback at a time when the press-formed product is removed from a die, the rigidity adding shape is arranged to extend in a direction of crossing a displacement contour indicating a state of springback in an initial shape prior to an arrangement of the rigidity adding shape of the press-formed product.

18 . The rigidity improvement method according to claim 17 , wherein the displacement contour is obtained by a springback analysis of the initial shape, and the rigidity adding shape is arranged to extend in the direction of crossing the displacement contour.

19 . The rigidity improvement method according to claim 18 , wherein
a plurality of rigidity adding shapes are arranged to extend in the direction of crossing the displacement contour, and adjacent rigidity adding shapes of the plurality of rigidity adding shapes overlap with each other and extend in the direction of crossing the displacement contour.

20 . The rigidity improvement method according to claim 17 , wherein the rigidity adding shape has a closed profile shape arranged to extend along a peripheral edge of the initial shape.

21 . A press-forming die for producing a press-formed product on which a rigidity adding shape is arranged from a sheet material to suppress springback at a time when the press-formed product is removed from a die,
wherein the press-forming die comprises a die member configured to form the rigidity adding shape to extend in a direction of crossing a displacement contour indicating a state of springback in an initial shape prior to an arrangement of the rigidity adding shape of the press-formed product.

22 . The press-forming die according to claim 21 , wherein the displacement contour is obtained by a springback analysis of the initial shape, and the rigidity adding shape is arranged to extend in the direction of crossing the displacement contour.

23 . The press-forming die according to claim 22 , wherein
a plurality of rigidity adding shapes are arranged to extend in the direction of crossing the displacement contour, and adjacent rigidity adding shapes of the plurality of rigidity adding shapes overlap with each other and extend in the direction of crossing the displacement contour.

24 . The press-forming die according to claim 21 , wherein the rigidity adding shape has a closed profile shape arranged to extend along a peripheral edge of the initial shape.

25 . A press-formed product produced by press-forming a sheet material and on which a rigidity adding shape is arranged to suppress springback at a time when the press-formed product is removed from a die,
wherein the rigidity adding shape is arranged to extend in a direction of crossing a displacement contour indicating a state of springback in an initial shape prior to an arrangement of the rigidity adding shape of the press-formed product.

26 . The press-formed product according to claim 25 , wherein the displacement contour is obtained by a springback analysis of the initial shape, and the rigidity adding shape is arranged to extend in a direction of crossing the displacement contour.

27 . The press-formed product according to claim 26 , wherein
a plurality of rigidity adding shapes are arranged to extend in the direction of crossing the displacement contour, and adjacent rigidity adding shapes of the plurality of rigidity adding shapes overlap with each other and extend in the direction of crossing the displacement contour.

28 . The press-formed product according to claim 25 , wherein the rigidity adding shape has a closed profile shape arranged to extend along a peripheral edge of the initial shape.

29 . A method of producing a press-formed product,
wherein, in producing a press-formed product on which a rigidity adding shape is arranged by press-forming a sheet material, to suppress springback at a time of removal from a die, the rigidity adding shape is arranged to extend in a direction of crossing a displacement contour indicating a state of springback in an initial shape prior to an arrangement of the rigidity adding shape of the press-formed product.

30 . The method according to claim 29 , wherein
the displacement contour is obtained by a springback analysis of the initial shape, and the rigidity adding shape is arranged to extend in a direction of crossing the displacement contour.

31 . The method according to claim 30 , wherein
a plurality of rigidity adding shapes are arranged to extend in the direction of crossing the displacement contour, and adjacent rigidity adding shapes of the plurality of rigidity adding shapes overlap with each other and extend in the direction of crossing the displacement contour.

32 . The method according to claim 29 , wherein the rigidity adding shape has a closed profile shape arranged to extend along a peripheral edge of the initial shape.

Assignees

• Jfe Steel Corp

Inventors

• Kariyazaki Yuta
• Yamasaki Yuji

Classifications

• B21D22/02

  Stamping using rigid devices or tools · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title

• B62D25/08

  Front or rear portions {(sub-frames for mounting engine or suspensions B62D21/11)} · CPC title

• B62D25/04

  Door pillars {; windshield pillars} · CPC title

• B62D25/02

  Side panels {(B62D33/046 takes precedence; sideboards for open load compartments B62D33/023)} · CPC title