Transactions of Materials and Heat Treatment

Title：Optimization on forming process of automobile steering knuckle based on Kriging model and numerical simulation

Authors： Huang Jin

Unit： School of Electronics and IoT Engineering Chongqing Industry Polytechnic College

KeyWords： steering knuckle hot forging Kriging model genetic algorithm resistance wall structure 40Cr steel

ClassificationCode：TG316

year,vol(issue):pagenumber：2024,49(11):8-15

Abstract：

For the problems of insufficient filling and excessive forming load in the hot forging process of a certain automotive steering knuckle, the simulation optimization was conducted by using finite element software Forge. First, a Hensel-Spittel constitutive model for 40Cr steel was established based on hot compression experiments. Next, the structure parameters of resistance wall were selected as the optimization design variables, and the orthogonal experimental design and numerical simulations were carried out. Finally, a response surface model was constructed, and the optimization was performed by using a multi-objective genetic algorithm. The research shows that 40Cr steel undergoes recrystallization softening above 1123 K, and the softening phenomenon becomes more pronounced as the temperature increases and the strain rate decreases. When the temperature exceeds 1123 K and the strain rate is below 1 s-1, a significant stress peak occurs. The Hensel-Spittel model can accurately predict the high-temperature rheological characteristics of the material, and the parameters are easy to solve. A well-designed resistance wall structure can effectively change the flow laws of blank and ensures the filling performance. The actual production trial results have verified that the optimal solution selected from the optimal frontier solution set can obtain qualified forgings.

Funds：

重庆市职业教育教学改革研究项目(Z233028)；重庆工业职业技术学院教育科学规划项目(2023GZYJYGHY-02)

作者简介：黄进(1981-)，男，博士研究生，副教授 E-mail：huangjin@cqipc.edu.cn

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