Method of producing thread rolling die

A method of forming a thread rolling die for fasteners and the like having cylindrical bodies and pointed ends comprising the steps of forming a die block with a generally planar first surface corresponding to the cylindrical main body of the fastener and a second surface generally corresponding to the point of the fastener, and cutting threads across both of said surfaces with a rotary cutter rotating about an axis generally parallel to said first plane and transverse to said threads, the threads on at least said second surface being individually cut during a plurality of separate machine passes of the rotary cutter over said surface, the rotary cutter being arranged to remove sufficient material from the die block preform to form substantially the entire profile of the threads on said second surface whereby inaccuracies in the form of such threads on the second surface related to the original contour of the die preform are substantially avoided, the rotary cutter being provided with an axially extending preliminary cutter having sufficient axial length and a suitable diameter to face the crest of the next adjacent thread to be formed on said second surface by said rotary cutter.

A method of forming a thread rolling die for fasteners and the like having cylindrical bodies and pointed ends, comprising the steps of forming a die block with a generally planar first surface corresponding to the cylindrical main body of the fastener and a second surface generally corresponding to the point of the fastener, and cutting threads across both of said surfaces, the threads on at least said second surface being cut during a plurality of separate machine passes of cutter means over said second surface, the cutter means being programmed to contour the first and second surfaces in an area adjacent their intersection at the forward end of the die with a profile that corresponds to a reduced volume of blank stock in its point and adjacent sections of the cylindrical main body as compared to the corresponding profile at the finish end of the die whereby displacement of blank material from its point area is accomplished at a relatively early stage in the thread rolling process and thread rolling pressures are reduced.