Research On Gear Tooth Surfaces Finishing Using Chemical Mechanical Methods

Gear is a key component in mechanical transmission and plays an important role in mechanical equipment. Each index of all kinds of mechanism, such as operating precision, performance, life and reliability, are closely related to gear performance. Gear is gaining wide popularity in the automobile industry, almost all car transmission system contains gear pair. Therefore, the gear manufacturing precision and quality will directly affect the efficiency of auto transmission system, noise, movement precision and longevity,etc. Numerous studies show that improving the surface quality of gear can effectively improve various aspects performance of gear and can improve its service life. Tooth surface finishing is an effective way to improve the tooth surface quality and improve the accuracy of gear.Chemical mechanical finishing (CMF) has developed rapidly in recent years as a non-traditional machining technics, and its prominent advantages is high efficiency and can obtain good surface morphology. At present, it has been applied in various mechanical parts surface finishing, and it will be of great significance for improving gear quality if it can be applied in gear tooth surface finishing.This paper studied the material removal mechanism of chemical mechanical finishing based on the process of microscopic outline of workpiece surface morphology. Mechanical action in gear chemical mechanical finishing by generating method is analysed in detail. The relative speed changing curves and load distribution curves of meshing gear tooth profile were given which provide theory basis for precision analysis of gear chemical mechanical finishing by generating method.The traditional three-acid finishing was analysed, The environmental chemical finishing technic was studied, and 45# steel slice have been investigated. The results showed that chemical mechanical finishing can make Ra value of the steel parts surface roughness reduced from 0.252μm to 0.067μm, and proved that it is effective in steel parts chemical mechanical finishing.A mechanism is designed to finish the theoretical analysis and experimental research of cylindrical spur gear finishing using chemical mechanical methods. The experimental results showed that chemical mechanical finishing not only can obviously improve the machined gear surface quality, but also can improve the cylindrical spur gear tooth profile accuracy and spiral accuracy.