Prediction and Minimization of the Heat Treatment Induced Distortion in 8620H Steel Gear:Simulation and Experimental Verification  

作　　者：Wen Shao Mohan Yi Jinyuan Tang Siyuan Sun 

机构地区：[1]State Key Laboratory of High Performance Complex Manufacturing,College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China

出　　处：《Chinese Journal of Mechanical Engineering》2022年第6期207-218,共12页中国机械工程学报（英文版）

基　　金：National Key R&D Program of China(Grant No.2019YFB2004700);State Key Laboratory of High Performance Complex Manufacturing of China(Grant No.ZZYJKT2019-08);China Postdoctoral International Exchange Program(Grant No.140050004).

摘　　要：The considerable heat treatment induced runout value in the end face of the automobile main reducer gear is always dimensionally out of tolerance.It directly affects the dimensional accuracy,the grade of carburized and hardened gears,and the post-quenching manufacturing costs.In this study,three dimensional numerical models were developed to simulate the carburizing-quenching process of gear based on the multi-field coupling theory using DEFORM software.The results indicated that the ununiform cooling rate of the gear caused by the asymmetry of the web structure would result in the ununiform distribution of martensite,leading to the large runout value at the end face of the gear.Therefore,a novel method was proposed to minimize the heat treatment induced runout value.It was found that the heat treatment induced runout value could be effectively controlled by the addition of a compensation ring and the support of a rod structure.Further experiments showed that the average runout value of the gear end face before and after the proposed heat treatment method were about 0.023 mm and 0.059 mm respectively,which was in good agreement with the simulated results.The novel approach proposed in this study led to a reduction of the gear runout value by 70.0%‒76.9%compared to that of the original heat treatment process,which may serve as a practical and economical way to predict and minimize the heat treatment induced distortion in drive gear.

关 键 词：DISTORTION Carburizing-quenching Numerical simulation Heat treatment 8620H steel gear 

分 类 号：TG162.73[金属学及工艺—热处理]