In recent ten years, with the rapid development of computer hardware and software technology and the in-depth study of material forming law, computer numerical simulation technology has been applied to material forming and great progress has been made.
Hung. Hsiou used the upper bound method to study the effects of various parameters such as friction factors and number of teeth on forging force and metal filling in the forming process of spur gears. Germany th Herlan uses finite element analysis method and software to optimize the geometry of spur gear, so as to reduce forging pressure and die stress. At the same time, the die stress diagram of finite element analysis and the optimized shape of spur gear are given. Finally, the fatigue test of precision forged spur gear is compared with that of spur gear produced by traditional technology. The British used the slice method and the upper bound element method to analyze the forming process of spur cylindrical gears, while the Germans used the upper bound element method to analyze the forming process and die design of spur cylindrical gears and triangular internal fine teeth. The Danes proposed an advanced multi parameter, elastoplastic material model for the program, which makes it possible to analyze and optimize complex cold forging dies.
J. H.SONG and y.t.im have developed a computer-aided design system for a cold extruded spur gear. By inputting parameters that meet the product performance, the system automatically puts forward appropriate equipment, and engineers can easily choose the optimal design scheme. At the same time, the effects of the number of teeth, meshing coefficient and modulus on the deformation mechanism are analyzed by three-dimensional finite element method. Zhang Qingping of Shandong University and others selected the number of simulated surface elements, loading step size and modulus
The three-dimensional finite element numerical simulation of spur gear forming is carried out by using the parameters such as number of teeth, number of teeth and gear height.
Jiang Hongzhi, Wan Pingrong and others discussed the structure and program implementation of the three-dimensional rigid plastic finite element simulation analysis system for metal bulk forming process, developed the corresponding three-dimensional rigid plastic finite element simulation software, and carried out the three-dimensional rigid plastic finite element analysis of metal bulk forming process with the precision forging process of spur gear as the research object. In order to reduce the precision forming force of spur gear, Feng Zaixin, Zhang Zhimin and others put forward a new open forming method of spur gear based on the analysis of closed pier extrusion forming of spur gear, that is, open warm pier extrusion cold extrusion composite forming process. The closed pier extrusion and open forming methods are numerically simulated by three-dimensional finite element method.