Transactions of Materials and Heat Treatment

Title：Influence of forming process on microstructure and properties of fiexspline for harmonic reducer

Authors： Wang Yang Shao Zhuhao Gao Mingyan Yang Guoqiang Zhang Chaolei

Unit： Beijing CTKM Harmonic Drive Co. Ltd. School of Materials Science and Engineering University of Science and Technology Beijing

KeyWords： flexspline of harmonic reducer free forging composite forming die forging grain size metal streamlines

ClassificationCode：TG317

year,vol(issue):pagenumber：2022,47(11):36-41

Abstract：

The influences of materials utilization and forming process for the three forming processes of free forging, composite forming and die forging on the billet microstructure, grain size, metal streamline and hardness uniformity of flexspline were studied by the quality tracking, optical microstructure observation, low magnification structure acid etching detection and mechanical properties measurement of the forming process for harmonic reducer flexspline. The results show that after the flexspline billet is quenched and tempered at medium temperature, its structure is tempered troostite, and the grain size can reach 10.5-12.0. The material utilization of free forming process is lowest，which is 2.3%, and the cost of material and machining is the highest and the uniformity of hardness is poor, which is not suitable for the production of flexspline. In comparison, the material utilization of composite forming process is highest, which is 11.1%, and no rough machining is required, but the metal streamlines are folded and disordered, so the process needs to be further optimized. In addition, the material utilization of die forging material is in the middle, which is 3.6%, it is the best in grain size, hardness uniformity and metal streamline distribution, and it is the most suitable forming process for flexspline at present.

Funds：

作者简介：王洋（1983-），男，硕士，高级工程师，E-mail：wangyang@ctkmhd.com；通信作者：张朝磊（1984-），男，博士，副教授，E-mail：zhangchaolei@ustb.edu.cn

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