Transactions of Materials and Heat Treatment

Title：Optimization on pre-formed structure for complex special-shaped parts based on CCD

Authors： Ma Zhifeng1 2 Li Zhaocan3 Yu Jianmin3 Zhang Qilin3 Hu Hongbing3 Lu Zheng1 2

Unit： 1.Aluminum Alloy Research Institute of Beijing Institute of Aeronautical Materials AECC 2.Beijing Engineering Technology Research Center for Advanced Aluminum Alloy Materials and Applications 3.College of Materials Science & Engineering North University of China

KeyWords： special-shaped part pre-forming central composite design flash area pressure streamline

ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(7):13-21

Abstract：

The pre-formed part was used as the final forming billet, and the pre-formed structure was optimized and designed using central composite design (CCD) algorithm to make the complex special-shaped forgings less flash in pre-forming and reduce the forging force. Therefore, the influences of different section parameters L1、L2、H1 and R on flash area ΔA and pressure p of the pre-forming forgings were investigated by means of CCD algorithm. The results show that the flash area ΔA gradually increases with the increasing of L1、L2、H1 and R, the pressure p first decreases and then increases with the increasing of L1, and gradually decreases with the increasing of L2、H1 and R. The optimal process parameters are L1=71.00 mm，L2=14.81 mm，H1=7.50 mm，R=6.50 mm, and the flash area ΔA=123.27 mm2, the pressure p=399.65 MPa, and the evaluation index φ=1. The simulation results show that the distribution of metal streamline is reasonable, and the displacement field conforms to the actual flow laws. The complex special-shaped forgings formed by the optimized process parameters have smooth surfaces and no obvious folding defects, which demonstrates the feasibility of optimization for CCD algorithm on complex special-shaped parts.

Funds：

山西省重点研发计划（2020XXX015）

作者简介：马志峰（1977-），男，硕士，高级工程师 E-mail：zhifengma@163.com 通信作者：于建民（1974-），男，博士，教授 E-mail：yujianmin@nuc.edu.cn

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