Hirschvogel Umformtechnik Gmbh

Michael Dahme

Manfred Hirschvogel

Hubert N&auml;gele

Peter Kettner

Walter Pischel

Karl Schuster

The invention relates to a method of manufacturing a wobble die () for shaping the internal contour or the external contour of a workpiece () in a wobble process. Thereby a wobble movement is initially selected. The three-dimensional geometry of the workpiece () is described. From the three-dimensional geometry of the workpiece () there is prescribed a virtual die (), the shape of which corresponds in substance to the negative geometry of the workpiece (). The virtual die () is deformed, taking into account the parameters of the selected wobble movement, to a geometry describing the wobble die (). Finally, a wobble die () is produced on the basis of the geometry obtained in the preceding step.

Method of producing a wobble die

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 ( ).

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Kaufering, Germany

Michael Dahme