锻压技术

纯钛薄壁管端法兰扩口-镦粗复合成形工艺

英文标题：Combined forming process of flaring-upsetting for pure titanium thin-walled tube end flange

分类号：TG316

出版年,卷(期):页码：2024,49(10):30-34

摘要：

为解决管端法兰直接镦粗成形过程中易产生折叠缺陷的问题，以TA2纯钛管为原材料，提出了管端法兰扩口-镦粗复合成形新方法，并成功制备出纯钛薄壁管端法兰。采用实验和数值模拟方法研究了不同角度的扩口预变形对管端法兰镦粗过程中折叠缺陷形成位置及大小的影响规律，并对经20°和0°扩口变形的管端法兰在镦粗行程为50%时的径向流速分布进行了分析对比。结果表明：在数值模拟中，折叠区域的应变量很大，其是由管壁挤压形成的折叠缺陷导致的；扩口预变形会使自由管端法兰镦粗时在内部产生弯矩，改变了纯钛的金属流动行为；折叠缺陷的深度随着扩口角度的增大而减小；相对于直接镦粗，先经20°扩口变形再镦粗成形的管端法兰，其折叠缺陷由内壁转移至上表面，且折叠缺陷的深度较小，后续机加工去除后不影响管端法兰的整体质量。

In order to solve the problem of folding defects that are prone to occur during the direct upsetting process of tube end flange, for TA2 pure titanium tube, a new method of flaring-upsetting combined forming for tube end flange was proposed, and the pure titanium thin-walled tube end flange was successfully prepared. Then, the influence laws of flaring pre-deformation at different angles on the formation position and size of folding defects during the upsetting process of tube end flange were studied by experiment and numerical simulation methods, and the radial velocity distribution under the upsetting stroke of 50% for the tube end flanges with flaring angles of 20° and 0° was analyzed and compared. The results show that the strain of folding region is large in numerical simulation, which is caused by the folding defect formed by the extrusion of tube walls. The flaring pre-deformation causes the internal bending moment to occur when the free tube end flange is upsetting, which changes the metal flow behavior of pure titanium. The depth of folding defect decreases with the increasing of flaring angle. Compared with the direct upsetting, the folding defects of tube end flange formed by flaring 20° first and then upsetting are transferred from the inner wall to the upper surface, and the depth of folding defects is relatively small, which does not affect the overall quality of tube end flange after the removal of machining.

基金项目：

作者简介：郭世勇（2000-），男，硕士研究生,E-mail：15536982342@163.com;通信作者：林鹏（1982-），男，博士，副教授,E-mail：linpeng@tyut.edu.cn

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