Backward extrusion process for inner profiles
AssigneeGKN Driveline International GmbH
InventorsUlrich Brochheuser, Andreas Gehrke
Life of this patent
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Abstract
A process of producing an inner profile (18)in a tube or hollow profile (11) includes inserting the tube or hollow profile (11) into a supporting sleeve (12), with a first tube end (19) being axially supported; placing a pressure-loaded annular die 16 on to the other tube end (20); pressing a forming die (15) with an outer profile into the tube or hollow profile (11) from the latter tube end (20) for producing the inner profile (18); allowing a return of the annular die (16) under a pressure load in the opposite direction of that of pressing in the forming die (15).
Claims10
A process of producing an inner profile in a tube or hollow profile comprising:
- providing one of a tube or hollow profile having an internal through opening and a constant cross section over the length thereof,
- inserting the tube or hollow profile into a supporting sleeve, with a first tube end being axially supported;
- placing a pressure-loaded annular die on to a second tube end;
- pressing a forming die with an outer profile into the tube or hollow profile from the second tube end for producing the inner profile;
- and
- allowing a return of the annular die under a pressure load in the opposite direction of that of pressing in the forming die;
- wherein the pressure load on the annular die is reduced with an increasing return path.
A process of producing an inner profile in a tube or hollow profile comprising:
- inserting the tube or hollow profile into a supporting sleeve, with a first tube end being axially supported;
- placing a pressure-loaded annular die on to a second tube end;
- pressing a forming die with an outer profile into the tube or hollow profile from the second tube end for producing the inner profile;
- and
- allowing a return of the annular die under a pressure load in the opposite direction of that of pressing in the forming die,
- wherein the pressure load on the annular die is reduced in such a way that the sum of an integrated wall friction between the tube or hollow profile and the supporting sleeve in the region of deformation, and the pressure load on the annular die remains approximately constant.
Dependencies are inferred from the claim text.