Patent ID: 8117884

Claim:
A method for profiling of a cylindrical, thin-walled, hollow workpiece by cold-forming, comprising: creating a profile running essentially parallel to a longitudinal axis of the hollow workpiece by means of at least one profiling tool arranged externally to said hollow workpiece and carrying out, in a direction radial to said longitudinal axis, hammering metal working impacts against the workpiece; the at least one profiling tool executing its metal-working impacts onto an external surface of the workpiece while oscillating in a direction essentially perpendicular to said longitudinal axis; and accomplishing a relative movement of said profiling tool and said workpiece in axial direction while maintaining constant a radial profiling depth setting, until a desired axial length of profiling on the workpiece is achieved; wherein the profiling tool is designed as a metal working die comprising an active operational side having in a plane perpendicular to said longitudinal axis a cross-section corresponding to the contour of the profile to be created in the external surface of the workpiece, the active operational side having a lower edge which is inclined at an acute angle relative to said longitudinal axis, except for a calibration zone which is aligned parallel to the longitudinal axis, wherein said calibration zone forms an end portion of said lower edge, and wherein said calibration zone is that portion of said lower edge which is located closest to the surface of the workpiece.