锻压技术

Ti55钛合金管电辅助加热气压胀形圆角填充成形规律及多场耦合数值模拟

英文标题：Fillet filling law and multi-field coupling numerical simulation of Ti55 titanium alloy pipe in electric assisted heating bulging

作者：张宇翔汤泽军许爱军狄旭东惠鹏程王子涵

单位：南京航空航天大学北京卫星制造厂有限公司

关键词：Ti55钛合金电辅助加热圆角填充多场耦合胀形

分类号：TG316

出版年,卷(期):页码：2021,46(4):112-120

摘要：

利用ABAQUS仿真软件，采用间接顺序耦合的方式，建立了Ti55钛合金管电辅助加热气压胀形过程的电-热-力多场耦合有限元模型。通过多场耦合有限元分析和力学分析，研究了Ti55钛合金管电辅助加热气压胀形过程中的圆角填充规律。结果表明：当模型的节点电流密度为14 A·mm-2时，圆管壁厚最大减薄率仍然出现在过渡区；但当电流密度提高至15 A·mm-2后，圆管圆角处的温度进一步上升至750 ℃，直边部分因贴模降温，由温度分布结合力学分析可知，此时过渡区的成形压力大于圆角处的成形压力，因此，圆管壁厚最大减薄处由过渡区转移至圆角部分。该成形方法对圆管直角部分的贴模程度有较大改善,提高了Ti55钛合金管圆角填充的成形精度，并解决了直边过渡区最易形变并先于圆角区发生破裂的问题，充分利用了材料的成形性能。

The finite element model of electro-thermal-mechanical multi-field coupling for Ti55 titanium alloy pipe in the process of electric assisted heating bulging was established by simulation software ABAQUS and the indirect sequential coupling method, and the filling law of fillet for Ti55 titanium alloy pipe in the process of electric assisted heating bulging was studied by multi-field coupled finite element analysis and mechanical analysis. The results show that when the nodal current density of the model is 14 A·mm-2, the maximum thinning rate of wall thickness for pipe still appears in the transition zone. However, when the nodal current density increases to 15 A·mm-2 and the temperature at the fillet of pipe further increases to 750 ℃, the straight side part cools down because of sticking to die. According to the temperature distribution and mechanical analysis, the forming pressure in the transition zone is larger than the forming pressure at the fillet. Therefore, the maximum thinning rate of wall thickness for pipe is transferred from the transition zone to the fillet zone. Thus, the electric assisted heating bulging process greatly improves the degree of sticking to die at the right angle part of pipe, improves the forming accuracy of fillet filling for Ti55 titanium alloy pipe, solves the problem that the straight edge transition zone is the most easy to deform and crack before the fillet zone, and makes full use of material forming property.

基金项目：

装备预研领域基金（61409230408）

张宇翔（1997-），男，硕士研究生 E-mail：2444280763@qq.com 通讯作者：汤泽军（1981-），男，博士，副教授 E-mail：zjtang@nuaa.edu.cn

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