Method for fabricating a dished hollow body possessing a linear or helical inner toothing

A method for fabricating a substantiallly dished hollow body possessing straight or helical internal teeth, having at least a partial web portion and a substantially tubular rim portion connected to said web portion, comprising the steps of:

• providing a workpiece blank which, in longitudinal section, possesses a rounded portion in a transition region between a rim porion, having a predetermined wall thickness, and a web portion thereof;
• forming said rounded portion with a mean radius of curvature which is at least as large as the predetermined wall thickness of said rim portion of said workpiece blank;
• providing a mandrel which possesses external teeth corresponding to said internal teeth which are to be fabricated on the workpiece blank;
• and
• cold working said rim portion of the workpiece blank on the mandrel according to the Grob method to form the substantially dished hollow body with internal teeth up to the proximity of said web portion of said workpiece blank.