锻压技术

基于AFDEX的45°斜三通挤压成形工艺数值模拟及试验研究

英文标题：Numerical simulation and experimental study on extrusion forming process of 45° lateral tee based on AFDEX

关键词：45°斜三通镦粗反挤压穿孔数值模拟

分类号：

出版年,卷(期):页码：2016,41(4):60-64

摘要：

基于AFDEX有限元软件，建立了某规格45°斜三通挤压成形热力耦合有限元模型，揭示了成形过程中等效应变、载荷-时间曲线和模具应力的分布规律，得到了挤压该规格45°斜三通件挤压设备吨位。研究结果显示，高应变值主要集中在坯料金属流经垂直冲头的区域；由载荷-时间曲线可知，镦粗开始后，镦粗杆的载荷先缓慢上升，之后快速增大，直到镦粗结束，成形载荷为42410 kN；反挤压开始后，随着加载过程的进行，反挤压杆的载荷迅速增大至约23000 kN，之后一段时间内相对趋于稳定，最终，成形载荷为34920 kN。结合工艺试验，镦粗和穿孔的成形载荷分别为41520和34500 kN，与模拟结果非常接近，验证了工艺方案的合理性，模具结构满足要求。

Based on software AFDEX, a thermal-mechanical plasticity FEM model for extrusion process of 45° lateral tee was established. The effective strain, load-time curves and the distribution of mold stress in the extrusion process were revealed, and the extrusion press tonnage for extruding the specified 45° lateral tee was obtained. The research results show that the high strain values mainly focus on the area where the blank flows through vertical punch. The load-time curves show that during upsetting process，the load of upsetting rod first increases slowly，then increases rapidly till the end of upsetting，and the forming load is up to 42410 kN；during backward extrusion process，the load of backward extrusion rod increases rapidly to 23000 kN，and then tends to stable in a period of time，finally the forming load rises to 34920 kN. Combining with the experiment, the loads in upsetting process and piercing process are 41520 and 34500 kN respectively, and are close to the simulation results，which shows that the above process is rational and the mold structure can satisfy the requirement.

基金项目：

国家科技重大专项（2014ZX04014-051）；国际科技合作与交流专项（2015DFA51740）

赵恒良（1987－），男，硕士研究生

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