Method for producing a ring-shaped or plate-like element

Patent metadata

Field	Value
Publication number	US-9651345-B2
Application number	US-201514835064-A
Country	US
Kind code	B2
Filing date	Aug 25, 2015
Priority date	Sep 17, 2010
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

The invention relates to a method for producing a ring-shaped or plate-like element, in particular for a metal-sealing material-feedthrough, in particular for devices which are subjected to high pressures, preferably igniters for airbags or belt tensioning devices, whereby a blank, especially in the embodiment of a wire-shaped material is provided and the blank is subjected to processing so that a feedthrough-opening can be incorporated into a ring-shaped or plate-like element created from the blank.

First claim

What is claimed is:

1. A method for producing a ring-shaped or plate-like element for a metal-sealing material-feedthrough for a plurality of devices which are subjected to high pressures, said method comprising the steps of:
providing a blank made of a high grade steel and copper alloy;
subjecting said blank to a processing so that a feedthrough-opening is incorporated into said ring-shaped or plate-like element created from said blank, said feedthrough-opening extending from a back side of said blank to a front side of said blank;
said processing of said blank including incorporation of a relief region having a height HF and extending from said back side toward said front side, said relief region formed using a process of cold-forming the high grade steel and copper alloy;
said relief region having a diameter that is less than an overall diameter of said ring-shaped or plate-like element; and
said ring-shaped or plate-like element having a reduced thickness region DR in said relief region that is less than the overall thickness D of said ring-shaped or plate-like element;
punching through said reduced thickness region DR to form said feedthrough-opening; and
inserting a sealing material into the feedthrough-opening;
said process of cold forming including the sub-steps of:
pressing a punch against one side of one of said ring-shaped or plate-like element; and
flowing a material of one of said ring-shaped or plate-like element around said punch;
said process of cold forming being carried out on the high grade steel and copper alloy which is configured with counter-opposing physical properties of:
1) elasticity which is sufficient to allow the flowing of material around the punch; and
2) sufficient strength and rigidity to absorb ejection forces acting upon the sealing material of between about 1750 to 3000 Newtons.

2. The method according to claim 1 , wherein said plurality of devices includes at least one of an igniter for an airbag and a belt tensioning device.

3. The method according to claim 1 , wherein said blank is formed as a wire-shaped material.

4. The method according to claim 3 , wherein said cold-forming process includes compression.

5. The method according to claim 4 , wherein:
said compression takes place along a longitudinal axis of said blank formed as a wire-shaped material.

6. The method according to claim 3 , wherein said ring-shaped or plate-like element has an essentially round outside contour and said feedthrough-opening is located in a center of said ring-shaped or plate-like element.

7. The method according to claim 1 , wherein an essentially conically tapering feedthrough-opening is punched out through said reduced thickness region DR.

8. The method according to claim 1 , wherein cold forming said ring-shaped or plate-like element from said blank, incorporating said relief region, and punching said feedthrough opening into said ring-shaped or plate-like element occur in an essentially equal amount of time.

9. The method according to claim 1 , wherein, to incorporate said relief region, said punch is pressed against one side of one of said ring-shaped or plate-like element and additional material of one of said ring-shaped or plate-like element is pushed out on a side opposite said side of said ring shaped or plate-like element.

10. The method according to claim 1 , wherein:
said relief region having a diameter that is greater than a diameter of said feedthrough-opening.

11. The method according to claim 1 , wherein:
said reduced thickness region DR having a reduced thickness DR that is chosen to allow said feedthrough-opening to be punched out.

12. The method according to claim 1 , wherein:
said blank having a copper content of between about 1% and about 5% by weight.

13. The method according to claim 12 , wherein:
said blank having a copper content of between about 2% and about 4% by weight.

14. The method according to claim 1 , wherein:
said reduced thickness region DR in said relief region being reduced by said cold-forming process by between about 20% and about 60% from said overall thickness D of said ring-shaped or plate-like element.

15. The method according to claim 14 , wherein:
said reduced thickness region DR in said relief region being reduced by said cold-forming process by between about 30% and about 50% from said overall thickness D of said ring-shaped or plate-like element.

16. A method for producing a ring-shaped or plate-like element for a metal-sealing material-feedthrough for a plurality of devices which are subjected to high pressures, said method comprising the steps of:
providing a blank made of high grade steel alloyed with copper;
subjecting said blank to a processing so that a feedthrough-opening is incorporated into said ring-shaped or plate-like element created from said blank, said feedthrough-opening extending from a back side of said blank to a front side of said blank;
said processing of said blank including incorporation of a relief region having a height HF and extending from said back side toward said front side, said relief region formed using a cold-forming process;
said relief region having a diameter that is less than an overall diameter of said ring-shaped or plate-like element;
said ring-shaped or plate-like element having a reduced thickness region DR in said relief region that is less than the overall thickness D of said ring-shaped or plate-like element, said reduced thickness region DR further having a reduced thickness being not greater than 3 mm; and

punching through said reduced thickness region DR to form said feedthrough-opening.

17. The method according to claim 16 , wherein said plurality of devices includes at least one of an igniter for an airbag and a belt tensioning device.

18. The method according to claim 16 , wherein said blank is formed as a wire-shaped material.

19. The method according to claim 18 , wherein said cold-forming process includes compression.

20. The method according to claim 19 , wherein:
said compression takes place along a longitudinal axis of said blank formed as a wire-shaped material.

21. The method according to claim 18 , wherein said ring-shaped or plate-like element has an essentially round outside contour and said feedthrough-opening is located in a center of said ring-shaped or plate-like element.

22. The method according to claim 18 , wherein, to incorporate said relief region, one of said ring-shaped or plate-like element is pressed against a punch and a material of one of said ring-shaped or plate-like element flows around said punch.

23. The method according to claim 22 , wherein an essentially conically tapering feedthrough-opening is punched out through said reduced thickness region DR.

24. The method according to claim 23 , wherein cold forming said ring-shaped or plate-like element from said blank, incorporating said relief region, and punching said feedthrough opening into said ring-shaped or plate-like element occur in an essentially equal amount of time.

25. The method according to claim 18 , wherein, to incorporate said relief region, a punch is pressed against one side of one of said ring-shaped or plate-like element and a material of one of said ring-shaped or plate-like element is pushed out on a side opposite said side of said ring shaped or plate-like element.

26. The method according to claim 16 , wherein:
said relief region hav

Assignees

• Schott Ag

Inventors

• Hartl Helmut
• Pfeiffer Thomas

Classifications

• B21J1/025

  affecting grain orientation · CPC title

• B60R2021/26029

  Ignitors · CPC title

• B21K21/08 Primary

  Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs · CPC title

• F42B3/103 Primary

  Mounting initiator heads in initiators; Sealing-plugs · CPC title

• Y10T29/49908

  Joining by deforming · CPC title