New technology of finish cutting teeth in large gear blanks

A new technology was developed for finish cutting teeth in large gear blanks to ensure the necessary precision and surface smoothness. An analysis of the cutting process relative to gear blanks with a hardness of bhn 320 has revealed that the wear on the back surface of the tool is determined essentially by the length of the cutting (friction) path. The known relations characterizing the dependence of the length of that path on other process parameters (tool radius, tool travel, depth of cut, angle of tooth profile) and the dependence of the depth of wear on the length of that path serve as the basis for optimizing the process. These considerations have resulted in the design of a double-thread cutter consisting of two cutting blades screwed into an arbor, their orientation relative to the cutter axis adjustable by means of support plates and a pin. The finish cutting can be combined with preliminary rough cutting and, furthermore, this cutter is more simple to produce and operate than a multithread cutter.