铝合金圆管空拉拔过程中温度场仿真预测
Simulation and Prediction of Temperature Field in Drawing Process for Aluminum Circular Tube
周 杰， 张光华， 权国政， 赵婉伊
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作者单位：重庆大学 材料科学与工程学院，重庆400030
中文关键字：拉拔； 有限元模拟； 温度场
英文关键字：drawing; finite element simulation; temperature field
中文摘要：阐述了塑性成形中热力耦合效应的数值分析方法，建立了铝合金空拉拔过程热耦合计算的有限元模型，设计了两组模拟方案，一组以拉拔速度为变量，速度变化范围为50～200 mm/s，一组以摩擦系数为变量，变化范围为0.02～0.4。通过模拟仿真获得了拉拔过程中模具和管子温度场的分布，并依据拉拔速度方案和摩擦系数方案得到了拉拔结束后模具最高温度分布和拉拔速度及摩擦系数的关系。结果表明，模具最高温度随拉拔速度的增加和摩擦系数的增加都是近似线性的增加；对坯料及模具温度场的仿真预测为润滑剂的选取、拉拔工艺及模具设计提供了依据。
英文摘要：The method of numerical analysis coupled thermal-mechanical effect during plastic forming was illustrated. A simulation model of drawing process based on heat coupling was set up，and two simulation plans, one with different drawing velocity in the range of 50～150 mm/s and another with different friction coefficient in the range of 0.02～0.4, was designed. According these two plans, the relationship between the maximum temperature of die and velocity of drawing, and the relationship between the maximum temperature of the die and the friction coefficient were gained. The results show that the maximum temperature of the die has a nearly linear increase with the increase of drawing velocity or the increase of friction coefficient. The simulation predictions of temperature field offer some references for the selection of anti-friction material and design of drawing process and die.