Patent ID: 6755748
Filing Date: 2004-06-29
Classification: B21K,B23C,B23Q,B25B,F16B,G05B

Abstract:
A method of manufacture of a cold-forming punch for screw heads intended to have a multi-tiered recess, each recess being a straight-sided polygon whose sides are substantially parallel the axis of the recess, said method comprising the step of adapting a computer numerical controlled machining centre having a bar feed to a rotary chuck by providing a profilating head as one of the tools on a turret mounted adjacent the chuck and capable of both axial and radial movement with respect to the axis of the chuck, as well as rotation about its own axis, said profilating head comprising at least two cutting elements arranged on the head, the cutting elements being adjustable with respect to one another: axially, with respect to the head axis; radially, with respect to said axis; and angularly with respect to said axis, whereby the cutting elements can be arranged to rotate around the same circle and with the requisite angular separation that at least some of the sides of a polygon are formed on the end of the bar when the cutter is rotated in the same direction, with respect to the bar, as the bar is rotated in the chuck, and the turret is moved axially and/or radially with respect to the chuck to bring the cutter into contact with an end face of the bar.