锻压技术

自增强理论在线性强化材料组合凹模设计中的应用

英文标题：Application of autofrettage theory in the design of linear strengthening material combined die

作者：杨丰钰胡成亮赵震廖喜平吴国洪

分类号：TG316

出版年,卷(期):页码：2016,41(6):78-82

摘要：

为了提高组合凹模的弹性强度极限和疲劳寿命，将自增强理论应用于双层组合凹模设计，尝试对线性强化材料模具的自增强过程进行理论解析。采用Msc.Marc有限元软件进行模拟计算，模拟与解析结果一致性良好。在此基础上，分析不同强化模量系数对自增强处理效果的影响，分析结果表明，凹模内侧的周向残余应力随着强化模量系数的增大明显减小；与传统组合凹模相比，自增强处理后的组合凹模内侧的周向残余应力显著提高，可以大幅降低模具内壁开裂的可能性。

In order to improve the elastic limit and fatigue life of combined die, the double layer combined die was designed based on the autofrettage theory, and its autofrettage process based on the linear hardening material model was theoretically analyzed. Then, the simulation calculation was carried out by finite element software Msc.Marc, and the calculated result agreed with the theoretical calculation result. Furthermore, the influence of different coefficients of strain-hardening modulus on the autofrettage effect was analyzed. The result shows that the circumferential residual stress at the internal boundary of die insert obviously decreases with the increase of the coefficient of strain-hardening modulus. Furthermore, comparing with traditional combined die, the circumferential residual stress at the internal boundary is improved remarkably, the risk of cracking on the internal surface of die is reduced significantly.

基金项目：

基金项目:国家自然科学基金资助项目（51475294）

作者简介：杨丰钰（1991-），男，硕士研究生 E-mail：yangfy1991@sjtu.edu.cn 通讯作者：胡成亮（1980-），男，博士，副教授 E-mail：clhu@sjtu.edu.cn

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