热锻模型腔表面层温度梯度分布规律的研究  

Distribution and Transforming Laws Research of Hot-forging Die's Temperature Gradient near the Surface Layer

作　　者：王冠[1] 王华昌[1] 肖瀚[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报》2011年第1期69-74,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50675165)

摘　　要：使用功能梯度材料设计制造锻制钢锻件的热锻模,需要全面深入掌握热锻模型腔表面层在实际工作时的温度梯度场的分布和变化规律。为此,用DEFORM-2D软件对轿车前轮毂热锻模的全工作过程进行了连续仿真,揭示了热锻模从第一次工作循环过渡到热平衡状态下的型腔表面层温度梯度场的变化过程和变化规律。热锻模温度梯度场的分布及其变化规律表明,热锻模对材料的耐热、耐磨、高温强度及高韧性的严格要求仅局限于模膛表面较薄的一层——温度波动区,而其它区域是不需要如此高性能的材料的。热锻模模膛表面层材料的选用,应主要考虑热胀系数、传热系数、热容量及其高温强韧性,这类材料只能由钴基或镍基高温合金与金属陶瓷组成的复合材料制备。因此,采用耐热、耐磨的功能梯度材料来制造热锻模,具有很高的经济价值。为热锻模型腔表面层的材料设计与制备提供了理论依据。In order to use functionally gradient materials to design and manufacture hot-forging die,it is necessary to illuminate the distribution and transforming laws of hot-forging dies temperature field,stress field and strain field in detail under real working conditions.This paper simulated the whole working process of Hot-forging die of front-wheel-hub of car by DEFORM-2D program.The cavity surface layers temperature field varying process and transforming laws from first working period to thermal equilibrium was illustrated.The variable parameters were analyzed quantitatively.The corresponding relations and differences were revealed for the first time.In this way,the distribution and transforming laws of temperature field of hot-forging die were comprehended more overall and concretely,which is the theoretical basis for the hot forging cavity design and preparation of functionally gradient materials.

关 键 词：温度梯度 分布规律 型腔表面层 热锻模 仿真分析 

分 类 号：TG315.2[金属学及工艺—金属压力加工]