Patent ID: 6546778
Filing Date: 2003-04-15
Classification: B21K,B25B

Abstract:
A process for making a tool for removing fasteners wherein the tool is cold formed from a tubular section that has a cylindrical inside surface and a tapered outside surface, said process comprising:driving the tubular section onto a floating punch that has helical splines at one end, said floating punch rotating in a first direction as it is driven into the tubular section to form helical splines in one end of the cylindrical inner surface of the tubular section; stripping the tubular section off of the end of the floating punch, said floating punch rotating in the opposite direction from the first direction as the tubular section is stripped off of the floating punch; and extruding the tubular section through a round-to-polygonal extrusion die insert to cold form the tapered outer surface of the tubular section to a polygonal surface having a substantially constant cross-section, said extruding step also cold forming the cylindrical inner surface of the tubular section to a tapered, polygonal surface to provide a section having a tapered, polygonal, inner surface that includes a plurality of spiral splines.