Yang Cheng et al. Analyzed the influence of mandrel exchange, floating die and local upsetting on the precision forging of spur gear. Using the finite element simulation method, the influence of mandrel exchange was analyzed from three aspects: forming load, blank deformation and speed field. It was concluded that mandrel exchange can effectively reduce the forming load in the precision forging process of spur gear; The filling resistance in the precision forging process of spur gear is analyzed, and the reason why the upper and lower corners are difficult to fill is found. It is found that this phenomenon can be improved by changing the motion mode of floating die, and the conclusion is verified by DEFORM-3D simulation software; By analyzing the pressure distribution on the contact surface during cylinder upsetting and the simulation of different local upsetting schemes of spur gears by DEFORM-3D simulation software, it is concluded that local upsetting can effectively reduce the load.
Zhang Lin analyzed the principle of common split flow method and its application in gear precision forging, and obtained the advantages of split flow method in improving material filling, reducing forming load and improving gear forming quality. Tan Xianfeng et al. Used two schemes of small mandrel constrained shunting and flange shunting to carry out the precision forging of spur cylindrical gear, analyzed the influence of blank aperture size on the working load and filling performance in the forming process, and obtained the best process conditions through numerical simulation and physical test: the blank diameter of floating die with small mandrel constrained shunting is 38 mm, the aperture is 16 mm, the height is 27.3 mm, and the blank diameter of fixed die with flange shunting is 38 mm The hole diameter is 18 mm and the height is 25.5 mm. Yang Sai et al. Compared the effects of extrusion forming process, floating die and split extrusion forming process on the tooth profile plumpness of aluminum alloy cylindrical spur gear, and obtained the best forming process.
In order to reduce the load in the precision forging process of spur gear, Yang designed several different dies with ring blank, and analyzed the effects of different die designs on metal fluidity and load through finite element simulation and experimental research. Maria kapustova and others used computer simulation software to optimize the process parameters of precision forging of spur gears from three aspects: metal flow in the cavity, equivalent stress and strain and forging temperature.