Patent ID: 7275407

Claim:
A process for producing a rotationally symmetrical component from a pipe, wherein the pipe initially has a constant outside diameter and a constant wall thickness and a length L 1 , and the rotationally symmetrical component has an outside diameter of at least one portion of the length of the component which deviates from the constant outside diameter of the pipe and a wall thickness which deviates from the constant wall thickness of the pipe and a length L 2 that is smaller than length L 1 at an intermediate step in the process, comprising the steps of: selecting a pipe having a constant wall thickness and constant outer diameter extending from one end portion of the length of the pipe to a middle area of the pipe length, said selected pipe corresponding to the smallest wall thickness of the finished rotationally symmetrical component, partially heating at least the one end portion of the length of the pipe, axially upsetting the heated end portion of the pipe, and radially forging the heated end portion of the pipe to form the at least one end portion of the rotationally symmetrical component, wherein axial upsetting and radial forging of the heated end portion of the pipe takes place while the pipe is clamped and it is performed in one working step, wherein the length reduction of the rotationally symmetrical component from length L 1 to length L 2 is caused by the axial upsetting at an intermediate step in the process such that the constant wall thickness and constant outer diameter extends between the radially forged and axially upset end portion to the middle area of the pipe length spaced from the radially forged and axially upset end portion; wherein a mandrel is located in the heated portion of the pipe during the axial upsetting and radial forging of the heated portion of the pipe to finally form the finished rotationally symmetrical component such that the constant wall thickness and constant outer diameter is maintained and extends between the radially forged and axially upset end portion to the middle area of the pipe length spaced from the radially forged and axially upset end portion.