Process and arrangement for the cold forming of hollow workpieces

Abstract

A process and device for manufacturing cylindrical hollow bodies out of a blank through cold forming using roll cylinders is provided. The axes of the roll cylinders in this process are essentially adjusted parallel to the axis of the workpiece and execute, essentially radial to the workpiece, an oscillating, reciprocating movement. This reciprocating movement is executed in such a manner that in the upper oscillation stop the roll cylinders and the workpiece preferably just barely touch each other without the application of force, and in the lower oscillation stop preferably dip into the surface of the workpiece up to the desired infeed depth in order to achieve the demanded external diameter of the workpiece. With this process the very high static pressures required for press roll machines can be avoided, which results in small and light engine frames, and simultaneously makes it possible to machine workpieces with flanges directly up to the flanges.