Patent ID: 7861572

Claim:
Method for making at least partly profiled tubes, at least on the inside, from a hollow cylindrical blank by mechanical cold-forming, the method comprising: feeding an end of the blank not to be worked to a clamping mechanism, clamping the blank in the clamping mechanism to hold the blank, introducing a mandrel arranged on a primary headstock into the end of a region of the blank that is to be worked, axially moving a lance with a free end coaxially through the mandrel and the blank, and into the clamping mechanism, bringing the lance into a form-fitting connection with the clamping mechanism at least in regard to traction and rotation, passing the mandrel axially through a stationary machining stage together with the clamping mechanism and the blank, so that the machining stage works radially on the surface of the blank from the outside, along a segment being worked, in order to create at least the inner profiling of the blank.