Y. Qin and R. Balendra used abaques simulation software to study the elastic deformation of the die cavity in the loading and unloading stage from the aspects of geometric parameters, friction conditions, blank materials, working belt length and so on. The results show that the dimensional accuracy of the extruded part is affected by the elastic deformation of the die. Large friction coefficient, high yield stress value of spiral bevel gear blank and small die material strength will lead to large die elastic deformation, and finally form large dimensional error after extrusion.
Liu Hua and Xi qingpo studied the influence of die elastic denaturation and tooth elastic recovery on the dimensional accuracy of spiral bevel gear precision forging, and carried out physical test verification. The numerical simulation method is still to calculate the plastic deformation of the tooth part separately from the elastic deformation of the die, apply the stress distribution on the contact surface obtained during the plastic forming of the tooth part as the boundary condition on the die surface, then take the die as the elastomer to calculate its elastic deformation, and use the same method to calculate the elastic recovery of the tooth part after the die. According to the simulation results, the elastic deformation and elastic recovery of the tooth profile curve are analyzed, the deformed tooth profile curve is obtained, the tooth cavity is corrected and compensated, and the physical test is carried out, and the gear product meeting a certain accuracy is obtained.
Wang Huajun, sun Shiwei and others designed and manufactured preforms and rolling test molds according to the forging drawing of the driven spiral bevel gear of the automobile rear axle. The rolling test results of lead specimens proved the feasibility of rolling forming process and die design. The forming test and grid test showed the filling process of tooth profile and the change trend of internal metal grid respectively, The metal flow law and strain distribution of the rolling forming of the driven spiral bevel gear are revealed, the rolling force reduction curve of the spiral bevel gear is tested, and the main measures to eliminate the insufficient filling of the tooth end are put forward. Tian Fuxiang and others designed a new die structure for closed precision forging of spiral bevel gear. The die adopts floating die and floating die core structure. The forging is formed in a closed die cavity formed by three dies and three die cores The forgings produced have no flash. The process test shows that the new die can significantly reduce the forging deformation force, material consumption and production cost, and improve the die life and production efficiency. Zhang Meng and others experimentally studied the plastic forming method of the driving spiral bevel gear of the automobile differential, designed and manufactured the test die, carried out the plastic forming experiment on the universal tensile testing machine, studied the metal flow and tooth filling process on the section of the plastic forming gear with the grid experiment, revealed the direction and distribution of the metal fiber, and mapped the stroke pressure curve of the lead test piece of the plastic forming spiral bevel gear, in order to optimize the preform It provides an experimental basis for the structural design of forming die and the calculation of force and energy parameters.