Transactions of Materials and Heat Treatment

Title：Optimization on multi-station cold forging process of steel ball sleeve screw based on numerical simulation

Authors： Du Yuqing Chen Xuewen Lian Tingting Zhu Hongliang Du Kexue Zhang Jiayin

Unit： Henan University of Science and Technology

KeyWords： steel ball sleeve screw cold extrusion upsetting strain distribution damage distribution

ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(9):22-28

Abstract：

For the forming of steel ball sleeve screw for auto parts, two sets of process schemes were designed. In process 2 of the first scheme, when the part was upsetted with a large height-to-diameter ratio, the part was prone to the problems of uneven side for drum part and folding. Among them, the height-to-diameter ratio was close to four, which exceeded the local upsetting ratio limit value of three. Therefore, the second scheme was proposed, namely the forced shrinkage pre-upsetting cold extrusion scheme. Then, the rheological stress model Hansel-Spittel of 20MnTiB alloy structural steel for steel ball sleeve screw was established by finite element software Forge, and two sets of forming process schemes were numerically simulated respectively to analyze the equivalent strain distribution, load-displacement curve and damage variation law during the forming process of part. The results show that the equivalent strain distribution and damage distribution of the second scheme are more uniform than that of the first scheme, and the maximum values of equivalent strain, the total load and the damage are smaller than those of the first scheme. So the second scheme is the optimal scheme. Through the test verification of the simulation results, it proves that the surface of final upsetting part is good in quality with full metal filling and no crack.

Funds：

国家自然科学基金资助项目(51575162)

杜昱青（1996-），女，硕士研究生 E-mail：DuyqStephanie@163.com 通讯作者：陈学文（1970-），男，博士，博士后，特聘教授 E-mail：chenxwdavid@163.com

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