热锻模模膛近表面层温度梯度的仿真分析及影响因素研究  

Simulation Analysis and Influencing Factors Research of Hot Forging Die's Temperature Gradient Near Surface Layer

作　　者：王华昌[1] 肖瀚[1] 程立本[1] 徐俊杰[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《热加工工艺》2010年第3期34-37,42,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(50675165)

摘　　要：模膛近表面层的热应力是造成热锻模损伤失效的主要原因。热应力产生的根本原因是热锻模近表面层存在着温度梯度,因此研究影响热锻模近表面层温度梯度的因素,找到减小温度梯度的方法就显得尤为重要。通过对轿车轮毂热锻成型过程的数值模拟分析,得到了锻模型腔近表面层的温度梯度的表达式,并比较了在不同导热系数,比热容和下压速度下温度梯度的变化情况,所得到的相关规律,解释了热锻模模膛近表层材料的导热系数、比热容和打击速度对热锻模的损伤与失效的作用机理。The thermal stress near the surface is the main reasons for hot forging die＇s failure, the fundamental reason for producing the thermal stress is the temperature gradient generated by near-surface layer of hot forging die, so it is particularly important to study the factors of generating the temperature gradient near the surface layer and to find ways to reduce the temperature gradient. Based on the numerical simulation analysis of car wheel molding hot forging process, the mold of temperature gradient near-surface layer is established, and some laws are founded though comparing different thermal conductivity, specific heat capacity and speed, which explain the forging die＇s failure mechanism.

关 键 词：热锻模 型腔表层 温度梯度 

分 类 号：TG315.2[金属学及工艺—金属压力加工]