A linkage model and applications of hobbing non-circular helical gears with axial shift of hob

Abstract The four-axis linkage hobbing without axial shift of hob has some disadvantages: narrow operating range, uneven load and wear among hob teeth. To solve these problems, a strategy of hobbing non-circular helical gears and its linkage model had been developed based on a method with axial shift of hob. The method includes two schemes: one is meshing point on hob fixed, and the other is meshing point moving at a constant velocity. Moreover, six possible operating modes are provided. The linkage model under every mode was verified to be valid by a virtual hobbing, and then their profile accuracies under the six modes have been compared and analyzed. We analyzed and compared their dynamics performances under every operating mode, and obtained their dynamic qualities of hobbing. Three practical applications of the linkage model were offered. The linkage model and the practical applications had been verified to be correct and feasible by a hobbing testing, which manifests that the hobbing method that meshing point on hob moving at a constant velocity has the longest hob life.

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