In the traditional technology, the processing of spiral bevel gear should go through the processes of heat treatment before blank forging, blank plastic processing, tooth profile cutting, gear end face processing, tooth surface heat treatment, precision datum correction and tooth profile finishing. In the traditional spiral bevel gear processing technology, plastic processing and tooth formation are separated, that is to say, the plastic processing of spiral bevel gear blank generally does not include tooth shape, which is the initial form of spiral bevel gear processing technology. This traditional process has developed more mature. Now the research on the toothless blank of spiral bevel gear mainly focuses on the blank of spiral bevel gear with complex shape or process, such as the blank of driven spiral bevel gear of automobile rear axle, the blank of quasi double curved driving gear and so on. Many scholars have done relevant research on the forming process, defects and die of toothless blank of spiral bevel gear.
Tian Kai analyzed the possible problems in the closed forging of spiral bevel gear blank, analyzed the causes of these problems and provided corresponding solutions, which has some inspiration for the technicians of spiral bevel gear enterprises in their work. Luo Shaoxing and others introduced the cold forging composite forming process of double active spiral bevel gear of automobile gearbox, which reduced the workload of machining after forging and saved material consumption and processing cost. Wang Dianqiu et al. Introduced the hot extrusion forming process of hypoid driving spiral bevel gear blank, and listed its advantages and possible problems. Wang Fengsheng and others studied the stress-strain distribution in the forming process of spiral bevel gear blank, and improved the die stress concentration by improving the die. At the same time, they studied the relationship between forming energy consumption and temperature. Pan Xiaoping improved the lower die structure of the blank of gear I driven spiral bevel gear. On this basis, experiments were carried out to verify the theoretical conjecture. The results show that the die of the improved process forging is normal and the spiral bevel gear is qualified, and the comprehensive cost is reduced.
Zhang Yongming used the simulation software to simulate the forging process of two groups of spiral bevel gear blanks with different blank shapes, and compared the simulated strain, temperature and streamline to obtain a reasonable scheme. Zhu Chundong optimized the upsetting process of automotive rear axle driven spiral bevel gear blank, and pointed out that the upper die cone angle of 12 ° is the optimal scheme, which provides a basis for the production practice of rear axle driven bevel gear blank. Cao Jianguo and others analyzed and optimized the traditional forming process of basin gear blank, solved the flash produced in the rolling process, and increased the process to reduce the subsequent machining workload. Zhang fating realized the closed die forging of the automotive rear axle driven spiral bevel gear blank by adopting a composite forging process, that is, free forging blank, reaming preform and press closed die forging. This composite forging process has achieved good results in technology and economy.