锻压技术

铝合金管等径孔电磁脉冲翻孔实验研究

英文标题：Experimental research on equal diameter hole flanging by electromagnetic pulse for aluminum alloy tube

作者：马伯洋杨澍李春峰于海平

分类号：TG391

出版年,卷(期):页码：2021,46(4):191-198

摘要：

传统工艺成形多通管件存在工装结构和工序复杂等问题。通过控制各项工艺参数，研究铝合金管电磁脉冲翻孔过程中主要参数的影响规律，获得了极限翻孔系数。研究结果表明：最佳预制孔形状为椭圆形；高放电频率会使管坯变形过快，从而导致裂纹产生；低放电频率会导致趋肤深度增大，使管坯外侧在变形中产生反向作用力而难以贴模；在一定范围内增大放电电压有利于管坯贴模；适当的润滑可以有效抑制翻孔端口的壁厚减薄。在本文条件下，等径翻孔的最大翻孔高度达6 mm，相比于常规翻孔工艺的理论值，极限翻孔系数降低了20.9%。

Multi-pass tubes formed by traditional technology exist the problems such as complex tooling structure and process and so on. Therefore, through controlling various process parameters, the influence laws of main parameters in the flanging process by electromagnetic pulse were studied, and the limit flanging coefficient was obtained. The results show that the best prefabricated hole shape is oval, and the high discharge frequency causes the tube blank to deform too fast, which leads to cracks, but low discharge frequency causes the skin depth to increase, which makes the outer side of tube blank produce a reverse force during deformation and makes it difficult to stick to the mold. It can be seen that increasing the discharge voltage within a certain range is beneficial to the tube blank sticking to the mold, and proper lubrication effectively inhibits the wall thickness thinning of the flanging port. Thus, the maximum flanging height of equal-diameter hole is up to 6 mm, and compared with the theoretical value of conventional flanging process, the limit flanging coefficient is reduced by 20.9%.

基金项目：

国家自然科学基金面上项目（51675128）

马伯洋（2000-），男，本科生 E-mail：1170910219@stu.hit.edu.cn 通讯作者：于海平（1974-），男，博士，副教授，博士生导师 E-mail：haipingy@hit.edu.cn

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