The surface quality of mechanical parts is an important index to evaluate the performance of products, which determines the wear resistance, fit quality and fatigue strength of parts. The finishing process can remove the remaining tool marks, burrs and flash on the machined surface, reduce the roughness of the part surface, and improve the smoothness and residual stress of the part; Due to the advantages of wide processing range, strong applicability and low cost, this technology is widely used in aerospace, medical support, precision electronics and other industries as a terminal process of precision machining.
With the development of computer simulation technology, domestic and foreign experts and scholars mostly use discrete element method and multi-physics field [8] to simulate the finishing process, analyze and predict different finishing processes by analyzing the particle motion trajectory, contact and other parameters, and carry out validation research in combination with experimental measurements. Hashimoto et al. According to different parts, Yang Shengqiang’s team from Taiyuan University of Technology conducted research on vibration, eddy current, centrifugal and spindle (vertical, horizontal and fork shaft) finishing methods, and explored the impact of different materials, shapes of abrasives and grinding fluids on the machined surface of parts and their mechanism.
As the core component of mechanical transmission, gear surface morphology directly affects the transmission efficiency, contact strength and fatigue life. Finishing the gear can effectively improve its surface integrity. Mallipedi et al. compared and analyzed the three-dimensional morphology of the tooth surface after grinding, honing and polishing, and pointed out that the morphology after polishing was isotropic. According to the FZG gear fatigue standard test, there was no pitting corrosion on the tooth surface after polishing. Qiao Jinwei and others carried out vibration finishing on the grinded spur gear, and the Ra of the tooth surface was 0 three hundred and fifty-five μ M decreases to 0 one hundred and fourteen μ m. The tooth surface compressive stress increased by 18.9%. Frechette et al. adopted the chemical plus drag type rolling and finishing process for the hypoid gear set of the rear axle of automobiles used in large quantities to realize the rapid and substantial reduction of the tooth surface roughness and improve the fuel economy of automobiles by 0 5%。 Zhang Yan et al. used the central composite experimental table to fit the relationship between the surface roughness value of the gear tooth root and the gear deflection angle, the drum speed, and the processing time in the cross-spindle hobbing process. Xie Panxin and others used the horizontal hobbing process for large gear shafts, and observed the motion of the hobbing grinding block in real time through EDEM simulation, and obtained the average contact force of the tooth surface. In view of the nonuniformity of the main shaft finishing, Ding Xiongxiong et al. proposed a new method of the main shaft swing compound hobbing gear finishing, and theoretically analyzed the influence of the drum speed, gear speed, swing angle and swing amplitude on the cutting speed and cutting angle, and the experimental verification can improve the surface quality and uniformity of the gear. However, the above research objects are involute gears, and the research results are not completely applicable to other types of gears.
Taking the spiral bevel gear used in aviation as the research object, the parallel spindle hobbing and finishing process is applied to establish the mathematical model of process motion. The discrete element method simulation technology is used to solve the gear wear amount under different rotational speeds based on the Archard Wear wear model. The parallel spindle hobbing and finishing experiment of the spiral bevel gear is carried out to verify the validity of the theoretical model and simulation model.