Gear Hobbing: a Contribution to Analogy Testing and its Wear Mechanisms

In order to evaluate performance and wear of gear cutters and coatings, various analogy cutting tests are nowadays used. Since these state-of-the-art tests significantly differ in complexity and comparability to real dry hobbing applications, this work presents a critical literature comparison highlighting the different characteristics, and further introduces a new approach to adjust the appearing wear characteristics by a simple analogy testing method. Moreover, substrate softening of PM-HSS during the cutting process has been analyzed and related to the relevance of the thermal barrier effect of coatings. The results are confirmed by calculations of the temperature evolution within the coating-substrate compound at constant contact temperature.