Method and device for achieving long collar lengths

Patent metadata

Field	Value
Publication number	US-2016354824-A1
Application number	US-201615171756-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 3, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

Quality collars with long collar lengths, homogeneous wall thickness distributions, and high loadability even in high-strength materials such as steel can be achieved on workpieces according to the disclosed methods and devices. One example method involves drawing the workpiece such that the drawn workpiece has a flange region and a drawn region adjoining the flange region, wherein the drawn region has a wall region and a drawn base adjoining the wall region, with the wall region forming a part of the collar; punching the drawn base located in the drawn region of the workpiece such that a drawn-base subregion adjoins the wall region; expanding the drawn-base subregion such that the expanded drawn-base subregion forms a part of the collar; and at least partially ironing and/or expanding the collar.

First claim

What is claimed is:

1 . A method for producing a collar on a workpiece, the method comprising:
drawing the workpiece such that the drawn workpiece has a flange region and a drawn region that adjoins the flange region, the drawn region including a wall region and a drawn base that adjoins the wall region, wherein the wall region forms a part of the collar; punching the drawn base such that a drawn-base subregion adjoins the wall region; expanding the drawn-base subregion such that the expanded drawn-base subregion forms a part of the collar; and one or more of at least partially ironing or at least partially expanding the collar.

2 . The method of claim 1 wherein a substantial portion of the collar is ironed, expanded, or ironed and expanded.

3 . The method of claim 1 wherein the ironing, expanding, or ironing and expanding of the collar begins before the punching of the drawn base.

4 . The method of claim 1 wherein the ironing, expanding, or ironing and expanding of the collar begins at the same time as or after the punching of the drawn base

5 . The method of claim 1 wherein the collar is ironed, expanded, or ironed and expanded to a substantially homogeneous wall thickness of the collar, wherein an ironed wall thickness corresponds at least to a smallest wall thickness prior to ironing of a region of the collar to be ironed.

6 . The method of claim 1 wherein the method further comprises upsetting the collar at least partially after expanding the drawn-base subregion.

7 . The method of claim 1 further comprising integrally forming a stamped portion in an inner flange region of the workpiece at an end of the ironing, expanding, or ironing and expanding.

8 . The method of claim 1 further comprising preforming a region of the workpiece to form at least one of a material reserve or a defined geometry for drawing the workpiece.

9 . The method of claim 8 wherein a region of the material reserve is located outside the region to be drawn.

10 . The method of claim 8 wherein a region of the material reserve is located inside the region to be drawn.

11 . A device for producing a collar on a workpiece, the device comprising:
means for drawing the workpiece such that the drawn workpiece has a flange region and a drawn region that adjoins the flange region, the flange region having a wall region and a drawn base that adjoins the wall region, wherein the wall region forms a part of the collar; means for punching the drawn base so as to produce a drawn-base subregion adjoining the wall region; means for expanding the drawn-base subregion such that the expanded drawn-base subregion forms a part of the collar; and means for one or more of at least partially ironing or at least partially expanding the collar.

12 . The device of claim 11 wherein the means for drawing the workpiece comprises a drawing punch with an ironing shoulder for at least partially ironing, expanding, or ironing and expanding the collar.

13 . The device of claim 11 further comprising means for at least partially upsetting the collar.

14 . The device of claim 11 wherein the means for drawing the workpiece comprises at least one of a drawing punch or a die having a forming shoulder for integrally forming a defined geometry in the flange region of the workpiece.

15 . The device of claim 11 further comprising means for preforming a region of the workpiece so as to form at least one of a material reserve or a defined geometry for drawing the workpiece.

16 . The device as claimed in claim 15 further comprising:
a first tool or a first tool portion; and
a second tool or a second tool portion,

wherein the first tool or the first tool portion includes the means for preforming, wherein the second tool or the second tool portion includes at least one of the means for drawing the workpiece, the means for punching the drawn base, the means for expanding the drawn-base subregion, or the means for at least partially ironing, expanding, or ironing and expanding the collar.

Assignees

• Thyssenkrupp Steel Europe Ag
• Thyssenkrupp Ag

Inventors

• Flehmig Thomas

Classifications

• B21D35/001

  Shaping combined with punching, e.g. stamping and perforating · CPC title

• B21D28/24

  Perforating, i.e. punching holes · CPC title

• B21D24/04

  Blank holders; Mounting means therefor · CPC title

• B21D19/088 Primary

  for flanging holes · 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