Patent ID: 6038901
Filing Date: 2000-03-21
Classification: B21C,B21D,B21H

Abstract:
A method for producing press-rolled tubes, comprising:inserting a first press mandrel with a tailstock-end shoulder into a tube, with the tube being arranged between the first press mandrel and one or more pressure rollers;plastically deforming the tube by force loading of the pressure rollers beginning at the tailstock-end shoulder and working in a direction of a machine spindle holding the tube to form a half-finished pipe having a wall thickening portion at an end corresponding to the tailstock-end shoulder;taking the half-finished pipe from the first press mandrel and clamping the half-finished pipe at the wall thickening portion;pushing a second press mandrel having an outer diameter (d2) which corresponds to the inner diameter of the wall thickening portion into the half-finished pipe; andplastically deforming the half-finished pipe by force loading of the pressure rollers from a tailstock-end towards the clamped end to form a second wall thickening portion at the tailstock end.