Hirschvogel Umformtechnik Gmbh

Walter Pischel

Hubert N&auml;gele

Manfred Hirschvogel

Peter Kettner

Michael Dahme

Karl Schuster

The invention relates to a method of manufacturing the outer part of a constant velocity joint, the outer part having in the finished condition a hollow chamber with a cylinder-shaped inner wall, in which there are provided ball raceways ( ) which run obliquely of the cylinder axis and are inclined with respect to one another. First, a wobble press die ( ) is axially introduced into a goblet-shaped preliminary workpiece ( ) for the outer part having a conically developing inner and outer wall and pre-formed ball raceways ( ) in the inner wall. The preliminary workpiece ( ) is pressed (drawing process) by means of the wobble press die ( ), sitting on the floor of the hollow chamber, through an opening in an outer die ( ), so that a drawing process is carried out in which the preliminary workpiece ( ) is so cold formed that the inner wall of the hollow chamber is given a cylindrical shape. Thereafter the outer die ( ) and the wobble press die ( ), having a truncated cone-shaped outer contour, and having elevations ( ) on its outer side corresponding to the ball raceways ( ) and having a lesser diameter than the cylindrical hollow chamber of the drawn preliminary workpiece ( ), are set into a wobbling circular movement relative to one another such that the elevations ( ) of the wobble press die ( ) move over the pre-formed ball raceways ( ) on the inner wall of the hollow chamber in a pressing and material shaping manner. Thereafter the wobble press die ( ) is axially drawn out of the preliminary workpiece ( ) and finally, the finished joint outer part is ejected from the outer die ( ).

Growing community of inventors

Kaufering, Germany

Walter Pischel