Patent ID: 8997541
Filing Date: 2015-04-07
Classification: B21C,B21D

Abstract:
1. Method for stretch-flow forming, in which a tubular workpiece is arranged around a spinning mandrel with an axis defining an axial direction, and a radial direction perpendicular to the axial direction, set into rotation about the axial direction and formed by advancing at least one forming roller, the method comprising: clamping the workpiece radially, at one end, on a clamping chuck which is rotatably supported on a headstock and driven in a rotating manner by a rotary drive in the headstock, rotating the tubular workpiece to reduce a wall thickness of the tubular workpiece and lengthen the tubular workpiece, wherein the spinning mandrel includes different external diameters in the axial direction, spinning the spinning mandrel to produce cylindrical and/or conical and/or cambered hollow parts of different design, moving the at least one forming roller and the spinning mandrel relatively in the axial direction with respect to the workpiece during the forming, and, for the purpose of designing varying diameters and/or wall thicknesses of the workpiece, moving the forming roller relatively in the axial and the radial direction with respect to the spinning mandrel, and wherein the spinning mandrel is axially moveably supported on the headstock and moved axially during rotation of the workpiece and forming with respect to the clamping chuck and the headstock.