Module Worm Cutter with Active Surfaces Generated by Continuous Sharpening

Abstract

First circles arc relieved tools, showed in the technical specialized literature, starting with 1953, was the worm cutter with detachable
rack-gear [1] and the profiled side mill [2]. At these tools, the machining of curve surface with optimized back angle is made by a continuous
grinding on universal sharpening machines, on grinding machines or on profile grinding machines. In order to allow this, the detachable teeth or rack gear are rotated with the crossing back angle, getting a position appropriate for sharpening. After sharpening, by rotating and fixing the teeth in working position, the cutting angles needed are obtained. Another solution is the sharpening and re-sharpening of rack-gear by mounting these in “false bodies” (special devices). After the back faces are grinding, the detachable rack gear or teeth are mounted in the worm cutter body, resulting the needed back angle. The module worm cutter constructive variants with individually teeth, mounted in conical bore, allow the shifted teeth position regarding the conventional position from the standard worm cutter, assuring better cutting conditions and teething precision. The improvement of this worm cutter allows the continuous teeth grinding, assuring the machining precision for teethed wheel, in condition of keeping the advantages obtained by teeth displacement. The teeth back surface generation is  made directly on the tool body by helical continuous sharpening.