Method and device for the production of a workpiece with...

Details Method and device for the production of a workpiece with... Method and device for the production of a workpiece with...

2007-06-19

2007-06-19

Banks, Derris H. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

With stripping or ejecting from tool

C072S354800, C072S355200

Reexamination Certificate

active

10415637

ABSTRACT:
The invention relates to a method and an apparatus for producing a workpiece with internal toothing, especially an internal geared wheel, by using a cup shaped preform (N) with a substantially cylindrical side wall (N1) and a mandrel (5) with an external profile (6) according to the internal toothing to be produced, as well as with a forming tool which reduces the outside diameter of the cylindrical side wall during an advancing movement, as a result of which the material of the cylinder wall region flows into the external profile (6) of the mandrel (5). In accordance with the invention, the forming tool is configured as a drawing ring (14) ensuring the ironing of the cylinder wall region (N1) during an advancing movement and that two tool elements act upon the preform (N) during the ironing, which tool elements produce axial compressive stresses in the cylinder wall region (N1) of the preform.

REFERENCES:
patent: 3694127 (1972-09-01), Takahashi et al.
patent: 3899912 (1975-08-01), Orain
patent: 5823104 (1998-10-01), Beisel et al.
patent: 1373547 (1974-11-01), None
patent: 1-317653 (1989-12-01), None
patent: 6-31374 (1994-02-01), None

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