Cutting of worm, spiroid and bevel gearwheel teeth by means of running-in cutter head

Abstract

The paper considers an alternative to traditional methods of tooth machining for worm, spiroid and bevel gearwheels – by means of an assembled multi-tooth running-in cutter head with hard-alloy inserts. Within the cutting process the cutter head is rotated and fed along its axis concurrently with the rotation of the workpiece, thus implementing the generating worm with a continuous or variable pitch. It is preferable to make the multi-thread generating worm with regard to increasing the production efficiency and valid control of the level of contact localization. The design scheme of setting parameters is considered on the basis of providing the conjugacy at two design points assigned at opposite tooth flanks. The design scheme of the generated tooth geometry is also discussed. Design examples are given to show the possibility of providing the necessary degree of contact localization. The method is implemented at common and simply set metal cutting machine tools – universal gear hobbing machines and machining centres. As compared to traditional methods, the proposed method provides the effective control of tooth geometry, reduction of time and cost of production preparation, especially in the absence of the specialized equipment, staff and corresponding techniques at the production site.