Post-compression for springback reduction

Patent metadata

Field	Value
Publication number	US-10668516-B2
Application number	US-201615254493-A
Country	US
Kind code	B2
Filing date	Sep 1, 2016
Priority date	Sep 1, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A sheet metal material is stamped into a formed shape having a side wall between a central portion and a flange portion. The central portion is held between an upper pad and a die, and the flange portion is held between an upper binder and a lower binder. A post-stamping compression force is applied along a length of the side wall of the formed shape. For example, application of the post-stamping compression force includes moving the lower binder relatively toward the upper pad, such as by delaying a return of the upper pad during a portion of a return of the lower binder. During application of the post-stamping compression force, an outward force is applied against an inner surface of the side wall to insure any bowing of the side wall is in an outward direction.

First claim

What is claimed is:

1. A metal stamping process including post-compression to control springbuck comprising:
stamping a sheet metal material into a formed shape having a side wall;
applying a post-stamping compression force along a length of the side wall of the formed shape;
wherein the stamping comprises holding a central portion of the sheet metal between an upper pad and a die, and holding a flange portion of the sheet metal between an upper binder and a lower binder, and wherein the central portion is adjacent an upper end of the side wall and the flange portion is adjacent a lower end of the side wall, and wherein applying the post-stamping compression force comprises moving the lower binder relatively toward the upper pad.

2. The metal stamping process of claim 1 , wherein the moving the lower binder and the upper pad relatively toward each other comprises delaying a return of the upper pad during a portion of a return of the lower binder.

3. A metal stamping process including post-compression to control springback comprising:
stamping a sheet metal material into a formed shape having a side wall;
applying a post-stamping compression force along a length of the side wall of the formed shape;
applying an outward force against an inner surface of the side wall during the applying the post-stamping compression force to insure any bowing of the side wall during the applying the post-stamping compression force is in an outward direction.

4. The metal stamping process of claim 3 , wherein the applying the outward force comprises extending at least one projection through a corresponding aperture in a die to engage the inner surface of the side wall.

5. The metal stamping process of claim 4 , wherein the extending at least one projection comprises applying a force to a link arm coupled to the at least one projection to increase the size of an angle between the projection and the link arm.

6. The metal stamping process of claim 4 , wherein the extending at least one projection comprises engaging cooperating cam surfaces of an upper cam member and a lower cam member, respectively, against each other.

7. The metal stamping process of claim 6 , wherein the stamping comprises holding a central portion of the sheet metal between an upper pad and a die, and holding a peripheral portion of the sheet metal between an upper binder and a lower binder, and wherein the central portion is adjacent an upper end of the side wall and the peripheral portion is adjacent a lower end of the side wall, and wherein applying the post-stamping compression force and extending at least one projection comprises moving the lower binder and lower cam member relatively toward the upper pad and the lower cam member.

8. The metal stamping process of claim 7 , wherein the moving the lower binder and lower cam member relatively toward the upper pad and upper cam member comprises delaying a return of the upper pad and the upper cam member during a portion of a return of the lower binder and the lower cam member.

Assignees

• Zhou Dajun
• Du Changqing
• Fca Us Llc

Inventors

• Zhou Dajun
• Du Changqing

Classifications

• B21D22/30

  to finish articles formed by deep-drawing · CPC title

• B21D5/01 Primary

  between rams and anvils or abutments · CPC title

• B21D22/22

  with devices for holding the edge of the blanks (B21D22/24 - B21D22/30 take precedence; shaping over a die without external former B21D11/02) · CPC title