Method and apparatus for producing a cylindrical hollow body...

Details Method and apparatus for producing a cylindrical hollow body... Method and apparatus for producing a cylindrical hollow body...

2004-12-28

2008-10-14

Tolan, Edward (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S076000

Reexamination Certificate

active

07434434

ABSTRACT:
A method is described for producing a cylindrical hollow body from a blank, with the workpiece being opened in the core region by successive swaging which is angularly offset against each other about the axis of the workpiece and being simultaneously pushed onto a piercing mandrel. In order to improve the piercing it is proposed that the workpiece is pressed during the swaging with a predeterminable axial force against the piercing mandrel which can be advanced against the workpiece against this axial force, which piercing mandrel is moved back to its initial position synchronous with the axial feed of the workpiece between the successive swaging steps.

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International Search Report Apr. 5, 2004.

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