Patent ID: 6516647
Filing Date: 2003-02-11
Classification: B21J,B21K,Y10T

Abstract:
Method of manufacturing an 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, having the following method steps:a) 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, b) the preliminary workpiece is pressed by means of the wobble press die, against a bottom 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, characterized by the following method steps: c) 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, with a wobbling movement of the wobble press die around a wobble point arranged above the floor of the hollow chamber, 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, d) thereafter the wobble press die is axially drawn out of the preliminary workpiece and e) finally, the finished joint outer part is ejected from the outer die.