Polygonal bolt pressing starts from deepdrawn blank formed to cylinder or cone in one sector prior to impressing edges and face by radially addressed punch.

摘要

The bolt blank as deepdrawn is cylindrically or conically preformed in bolt sector (12) and edge (13) and at least one face (16) are impressed by punch addressed radially to the sector circumference. The sector (12) is upset at the same time as edge and face work. The press punch is addressed radially via a slide wedge and press stroke and the open side of the blank has a flange folded in to close part of the face. Bolt sector (12) is preferably square or hexagonal in section.