Distribution characteristics of point discharge effect in the process of electroplating CBN gear-honing-tool

The electroplating cubic boron nitride (CBN) external gear-honing-tool is the main finishing machining tool of six to seven grade hardened gears with medium module. In the process of electroplating CBN for this gear-honing-tool, generating point discharge effect due to its metal matrix is resulted in decreasing quality of electroplated coating. That is the main factor of affecting precision and life of gear-honing-tool. In this work, positions of generating point discharge effect and affecting degree of quality of electroplated coating were analyzed on the matrix surface of gear-honing-tool. And it is the advancement method that was developed a pair of aided gears which control or eliminate tooth form error generated by point discharge effect. It was shown in experimental tests that the current density of addendum and tooth surface of CBN gear-honing-tool trended to equality by using aided gear, and the positions of point discharge effect were effectively controlled. So quality and thickness of metal electroplated coating on the addendum and tooth surface trended to uniformity. The tooth form precision of CBN gear-honing-tool was obviously improved. It is beneficial to prolonging the life of gear-honing-tool.