The Surface Heat Transfer Coefficient Model of 7075 Al-alloy Extrusion Product and its Temperature Prediction

摘要：

　　Surface heat transfer coefficient is a key parameter for accurately predicting the extrusion product temperature near the die exit and then achieving isothermal extrusion by speed controlling.Based on the heat transfer characteristics of extrusion product during cooling process,a dynamic loading method of heat transfer boundary conditions was proposed.The surface heat transfer coefficient model of 7075 Al-alloy extrusion product was established using the dynamic loading method and inverse calculation comprehensively.The model indicated the relationship among surface heat transfer coefficient h,surface temperature T and initial temperature T0 as h=1.16T-0.97T0.Its accuracy is high enough for calculating the surface temperature of 7075 Al-alloy extrusion product.According to the model and the experimental data,the relationship between the product and the measured temperatures can be established.It provides an effective way to solve the problem that the extrusion product temperature near the die exit cannot be directly measured.

关键词： 7075 Al-alloy Surface heat transfer coefficient Inverse calculation Hot extrusion

作者: Wenrong Hou Weibing Ji Zhihao Zhang Jianxin Xie

作者单位: Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,PR China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 229-236

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）