Patent ID: 7191626

Claim:
A method for producing an inner contour with an internal arbor acting on an inside of a cup-shaped or annular rotationally symmetrical workpiece that is carried by a rotating die as a workpiece mount that works together with the internal arbor during cold flow forming, comprising: inserting a workpiece provided with a press fit outside dimension or a prefabricated workpiece into the die; pressing the workpiece against an inner wall of the die with a tight frictional fit and rotationally fixed with the internal arbor; rotating the internal arbor against the workpiece to create the inner contour in a rolling process; and ejecting the workpiece after completion of the rolling process with an axial ram, wherein the internal arbor has a cylindrically outside profiling with a slanted entrance bevel section (9) with a pressure angle and is cantilever-mounted and is advanced axially and radially during the rolling process.