Patent ID: 6684678
Filing Date: 2004-02-03
Classification: B21K

Abstract:
A method for removing a ram from a hollow object, the hollow object having a plurality of grooves which are arranged opposite one another on its inner lateral surface and the longitudinal center axes of the hollow object of which run obliquely in relation to the associated longitudinal center plane, the ram being part of a tool with a die for forming the hollow object, and having a mandrel and also a plurality of ram segments arranged opposite one another in relation to the center axis of the mandrel, each with a bulge on the outside, the ram segments for forming the hollow object being spread into a working position, in which the bulges fit associated grooves, by first wedge or cone surfaces which are arranged on the lateral surface of the mandrel and on the insides of the ram segments in their free end regions and come into contact with one another upon the relative movement between the mandrel and the ram segments, and after the forming of the hollow object being contracted into a released position and removed, the method comprising the steps of:spreading the ram segments by the first wedge or cones surfaces and simultaneously by a second wedge or cone surfaces arranged at an axial distance from the first wedge or cone surfaces, contracting the ram segments by a third wedge or cone surface and a contact part cooperating therewith on the outsides of the ram segments of the tool, the third wedge or cone surface and the contact part being arranged, in relation to the axial distance, between the first and second wedge or cone surfaces, and removing the ram segments.