交通用铝型材挤压在线淬火过程的数值模拟和实验验证  

Numerical simulation and experimental verification of extrusion online quenching process of aluminum profile used for traffic

作　　者：徐戎[1,2] 李落星[1,2] 姚再起[1,2,3] XU Rong;LI Luoxing;YAO Zaiqi(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University, Changsha 410082, China;College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;Virtual Performance Development Division, Geely Automobile Research Institute, Hangzhou 311228, China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学机械与运载工程学院,湖南长沙410082 [3]吉利汽车研究院虚拟性能开发部,浙江杭州311228

出　　处：《中南大学学报（自然科学版）》2017年第12期3263-3270,共8页Journal of Central South University:Science and Technology

基　　金：国家"十二五"科技支撑计划项目(2011BAG03B02);国家自然科学基金面上资助项目(51075132)~~

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。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 about8.5%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.

关 键 词：铝型材 末端淬火 界面换热系数 反分析法 数值模拟 

分 类 号：TG156.3[金属学及工艺—热处理]