Transactions of Materials and Heat Treatment

Title：Influence of pressure relief hole diameter of cold precision forging steel billet for spur gear on elastic deformation of mold

Authors： Gao Feng He Shirong Wang Yonggang Gu Meng Xiong Kehui

Unit： University of Shanghai for Science and Technology

KeyWords： spur gear cold precision forging pressure relief hole elastic deformation tooth shape modification

ClassificationCode：TG315.2

year,vol(issue):pagenumber：2023,48(11):15-21

Abstract：

During the cold precision forging process of spur gears, due to a large forming load, the mold produces elastic deformation which affects the forming accuracy of formed gears. Therefore, in order to solve the above problems, the steel billets with different diameters of pressure relief hole were designed based on the radial shunt method. Then, a finite element model for billet plastic forming and mold stress analysis was established, and the influences of different diameters of pressure relief hole on the elastic deformation of mold were studied. Furthermore, according to the elastic deformation amount of mold cavity, the tooth profile curve of mold was modified by the inverse compensation method, and the deformation amounts of forgings before and after modification were compared. The results show that with the increasing of the diameter of pressure relief hole, the elastic deformation amount of mold increases and then decreases, and the elastic deformation amount of mold is the smallest when the diameter of pressure relief hole d0=Φ20 mm. The elastic deformation amounts of tooth cavity profile plane with different heights of mold change in the same situation, but the incremental magnitude is different. The deformation amount of upper profile plane is the largest and the fluctuation from the root to the top of tooth is large, and the peak is located in the top of tooth. The elastic deformation amount of forgings is reduced by 28.6% after the tooth shape modification of mold. Three groups of billets with different d0 were designed for forming experiments, and the experimental results were basically consistent with the simulation results. Thus, the dimensional accuracy of forged teeth is improved by reducing the elastic deformation amount of mold.

Funds：

上海科技委员会资助项目（19060502300）

作者简介：高枫（1997-），男，硕士研究生，E-mail：1255036197@qq.com；通信作者：何仕荣（1964-），男，博士，教授，E-mail：shironghe@bentek.com.cn

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