Transactions of Materials and Heat Treatment

Title：Study on fracture of cartridge case in ironing process

Authors： Hu Yechang Wei Yanzhong Li Ruijing Wei Zhifang

Unit： North University of China Shandong Special Industrial Group Northwest Institute of Mechnical & Electrical Engineering

KeyWords： cartridge case cup shell ironing process fracture numerical simulation

ClassificationCode：TJ411+1

year,vol(issue):pagenumber：2017,42(7):72-76

Abstract：

For problems of the cup shell crack for cartridge case in the ironing process, a theory model of stress calculation for multi-mode ironing process was derived from the classical theory of ironing with a single die, and the simulation on multi-mode ironing process was carried out by Deform. Therefore, the influencing parameters and the curve of stress change at the crack position of cup shell blank were obtained during the ironing process of cartridge case, and the flow of material at the mouth of cup shell blank was analyzed. The results show that the reason of the cup shell fracture in the ironing process is that material enriches at the sizing part of lower die, which increases the thinning rate of lower die and the deformation resistance of material. However, after the cone angle of the lower die of ironing is reduced, the surplus material becomes less. Compared with the measured data of stress in the ironing process, the simulation data fits for the experimental data, and the reliability of simulation is verified. Thus, it provides a reliable basis for the die design, the parameter optimization and the improved utilization of material in the cartridge case ironing process.

Funds：

国防基础科研支撑项目（A1020131011）

作者简介：胡冶昌（1992-），男，硕士研究生，E-mail：hellohuyec@gmail.com；通讯作者：魏志芳（1974-），女，博士，副教授，E-mail：lilac1974@139.com

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