锻压技术

316L/X70双金属复合管液压胀接成形机理

英文标题：Mechanism of hydraulic expansion forming for bimetal composite tube 316L/X70

作者：唐越倪兴健王勇勤

分类号：TH122

出版年,卷(期):页码：2018,43(1):90-96

摘要：

为了研究双金属复合管在液压胀接成形时的机理，将复合管成形过程分为3个阶段：衬管弹塑性变形、基管加载和卸载，并应用Tresca屈服法则，引入当量屈服强度，且考虑衬管应变强化现象，分析了在管内液压逐渐增大的过程中这3个阶段的基管、衬管的应力、应变关系，得到管道复合所需胀接内压力的选择范围和残余接触压力关于胀接内压力的关系。应用有限元分析和复合管成形实验，分别验证了管道在胀接过程中基管、衬管接触压力和基管外壁轴向、周向应变的理论解析解的正确性。在制定金属管复合工艺时，理论解析和数值模拟可以为生产实际提供有效指导。

In order to study the mechanism of hydraulic expansion forming for bimetal composite tube, the forming process of composite tube was divided into three stages: the elastic-plastic deformation of liner tube, the loading and unloading of base tube. Then, the relations of stress and strain of base tube and liner tube for three stages in the process of internal hydraulic pressure increasing gradually were analyzed by Tresca yield rule based on introducing the equivalent yield strength and considering the strain hardening phenomenon of liner tube, and the choice range of internal bulging pressure required by the tube compounding and the relationship between residual contact pressure and internal bulging pressure were obtained. Furthermore, the correctness of theoretical analysis on the contact pressure of base tube and liner tube in bulging process and the axial and circumferential strains at outer surface of base pipe was verified by the finite element analysis and forming experiments of composite tube. Thus, the effective guidance could be provided by theoretical analysis and numerical simulation when designing the compound forming process of metal tube.

基金项目：

作者简介：唐越（1989-），男，硕士，助教，E-mail：tangyue_2006@126.com

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