Transactions of Materials and Heat Treatment

Title：Forming technology of steering knuckle based on reasonable volume distribution for circular arc upsetting die

Authors： Cao Hong1 2 Xue Shibo1 Xue Chuanmei3 Shi Wenchao1 Song Zhongjiang4 Yin Xibing4

Unit： .Institute of Industry Equipment and Technology Hefei University of Technology 2. Hefei Midea Washing Machine Co. Ltd. 3. School of Materials Science and Engineering Hefei University of Technology 4. Anhui Xingrui Gear Transmission Co. Ltd.

KeyWords： steering knuckle volume distribution circular arc upsetting upper die free forging billet pre-forging final forging

ClassificationCode：TG376.2

year,vol(issue):pagenumber：2022,47(9):7-11

Abstract：

In order to reduce the fold defect and forming load of steering knuckle forgings and realize the reasonable distribution of metal, for the automobile steering knuckle with complex grade of S-class, the forming process scheme of free forging billet (upsetting-rod flattening), pre-forging and final forging were adopted, and the forming process was simulated numerically by software Deform-3D. Then, the metal flow laws, the distributions of equivalent stress and equivalent strain, and the load change laws during the forming process were studied by experimental verification. The results show that the designed circular arc shape in the middle of upsetting upper die plays a good role in metal distribution, and the defects of flash and folding for the pre-forged head are reduced. When the arc radius of upsetting upper die is 150 mm, the damage peak value of drum surface is the smallest. Using the forging method of circular arc upsetting upper die and free

forging billet-pre-forging-final forging, the forgings obtained by the simulation have no obvious forming defects, which provides theoretical guidance for the actual production of steering knuckle forgings.

Funds：

安徽省重点研究和开发计划项目（201904a05020075）；中央高校基本科研业务费专项资金资助（JZ2020HGTB0039）

曹洪（1995-），男，硕士 E-mail：1049334549@qq.com 通信作者：石文超（1988-），男，博士，副研究员 E-mail：shiwenchaohfut@hfut.edu.cn

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