锻压技术

弹壳引深工序中断裂研究

英文标题：Study on fracture of cartridge case in ironing process

作者：胡冶昌魏艳忠李瑞静魏志芳

分类号：TJ411+1

出版年,卷(期):页码：2017,42(7):72-76

摘要：

针对弹壳引深工序中盂子断裂的问题，根据经典的单模引深理论推导了多模引深应力计算理论模型，结合Deform软件对枪弹弹壳多模连续引深过程进行仿真分析，得到弹壳引深过程中影响盂子毛坯断裂处应力变化的参数及其应力变化曲线，分析了盂子毛坯口部的材料流动情况。结果表明，弹壳引深工序中盂子毛坯断裂的原因是下模定径部盂子材料富集，增大了下模变薄比与材料变形抗力。将引深下模的锥角减小后，口部富余体积变小。对比引深过程中应力的实验测量数据与数值模拟数据，吻合度较好，验证了模拟的可靠性，为弹壳引深工序中模具设计及其参数优化、提高材料利用率提供了可靠的依据。

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.

基金项目：

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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