Scoring resistance of gears with a sulphurizing process at low temperature

To clarify the scoring resistance of the gears with the sulphurizing process, which is an anodic sulphurization performed in a molten bath with a temperature of about 463 K, scoring tests were run. From the test results obtained by a power-circulating gear machine, it was found that the sulphurizing process has a significant effect on decreasing gear noise, and the scoring resistance of the gears is increased significantly due to the sulphurated layer formed on the meshing faces of the gears and to the tooth profile modification with the sulphurizing process.