交通用铝型材挤压在线淬火过程的数值模拟和实验验证

来源期刊：中南大学学报(自然科学版)2017年第12期

论文作者：姚再起 徐戎 李落星

文章页码：3263 - 3271

关键词：铝型材；末端淬火；界面换热系数；反分析法；数值模拟

Key words：aluminum profile; end quenching; interfacial heat transfer coefficient; inverse analysis method; numerical simulation

摘    要：建立某复杂截面铝型材挤压在线淬火实际生产过程的有限元模型，采用反求的界面换热系数作为界面换热参数，模拟计算型材挤压在线风淬过程。研究结果表明：在合金淬火敏感温度区间内，模拟温度与实测温度平均相对误差约为8.5%，证实了模型的可靠性；复杂截面铝型材各部位厚度差别较大，整体冷却不均匀，容易产生较大的热应力，增大型材产生变形等缺陷的风险。

Abstract: A finite element model for the on-line quenching process of aluminum profile extrusion with complex cross section was established. In this model, the inverse identified interfacial heat transfer coefficient was used as an important parameter to simulate the on-line quenching process of profile extrusion. The results show that the average relative error between the calculated temperature and the measured temperature is about 8.5% within the temperature range of quenching sensitivity, which verifies the reliability of the model. As a result of the characteristics of complexity in shape and difference in wall thickness, the aluminum profile produces the larger thermal stress easily during the quenching process, which makes the probability of quenching distortion increase.