China Coal Group has undertaken the task of ion nitriding on the inner ring gear surface of a large mining cart reducer. The ring gear (see photo) is a special double-connected, thin-walled structure and requires a high precision level. The left end module is 11.7 and the right end.
The modulus is 8.7 and the material is 40CrNiMo. Nitrogen is the last step of the gear due to the process of nitriding after grinding the finished product. To ensure the high-precision level of the gear, it is necessary to strictly control the nitriding deformation. In actual production, the distortion after nitriding has always been a problem that plagues domestic and foreign heat treatment production. Once the deformation can not be effectively controlled, the accuracy level of the gear is reduced, and the entire gear transmission system generates impact vibration and noise during operation, which reduces the reliability of operation and affects the life of the whole machine. Through the process innovation and experimental verification, the problem of nitriding deformation of the ring gear is basically solved.
