锻压技术

摩擦系数对薄壁T型管内高压成形的影响

英文标题：Influence of friction coefficient on internal high pressure forming for thin-walled T-shaped tube

作者：戴龙飞徐雪峰孙前江张建伟熊光利

分类号：TG394

出版年,卷(期):页码：2018,43(7):159-164

摘要：

为探究不同摩擦系数对成形T型三通管支管高度、壁厚差、最小壁厚及关键部位的壁厚变化的影响，利用DYNAFORM软件，对薄壁T型三通管内高压成形过程进行了模拟，研究了在0.01~0.2范围内6种不同摩擦系数情况下，支管高度和壁厚的变化，分析了最小壁厚和关键点随时间的变化情况，并选用4种不同润滑剂进行实验验证。结果表明：成形T型三通管的合适的摩擦系数区域为0.06~0.125，摩擦系数过大或过小都会影响T型三通管的成形效果。依据模拟结果，对薄壁铝合金管材进行成形实验，研究发现实际管材成形效果与DYNAFORM模拟结果较为吻合，验证了数值模拟结果的合理性。

To explore the influences of different friction coefficients on the branch height, wall thickness difference, minimum wall thickness and wall thickness variation at critical positions of T-shaped tube, the internal high pressure forming process of thin-walled T-shaped tube was simulated by DYNAFORM. Then, the changes of branch height and wall thickness were investigated by six kinds of friction coefficients in the range of 0.01-0.2, and the changes of the minimum wall thickness and the key points versus time were analyzed. Furthermore, the experiments were conducted by four kinds of lubricants. The results show that the forming quality of T-shaped tube is the best when the friction coefficient is in the range of 0.06-0.125, and the excessive friction coefficient or too little friction coefficient influence the forming of T-shaped tube. According to the simulation results, the forming experiments of thinwalled aluminum alloy tubes were carried out, and the actual forming results agree with the simulation results well，which verifies the rationality of the numerical simulation results.

基金项目：

国家自然科学基金资助项目（51405219）；中航工业产学研项目（BA2013063219）

戴龙飞（1992-），男，硕士研究生，E-mail：mmlftt@163.com；通讯作者：徐雪峰（1984-），男，博士，副教授，E-mail：xfwinzy@163.com

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