磨削硬化表层内冶金热效应预测三维分析模型  

Three-dimensional analysis model to predict thermo-metallurgical effects within the surface layer during grind-hardening

作　　者：吕长飞[1,2] 吴小玉[1] 郑继明[1,2] 

机构地区：[1]贵州师范大学机械与电气工程学院,贵州贵阳550025 [2]贵州师范大学机械与控制仿真重点实验室,贵州贵阳550025

出　　处：《金属热处理》2017年第3期189-194,共6页Heat Treatment of Metals

基　　金：贵州师范大学博士科研项目(11904-05032130023);贵州省科学技术基金项目(黔科合J字LKS[2013]36号);贵州省普通高等学校精密复合加工装备技术工程中心(黔教合KY字[2014]223)

摘　　要：磨削硬化是利用磨削过程中产生的热、机械复合作用直接对工件进行表面淬火的新工艺。本文通过建立磨削温度三维分析模型和冶金热效应分析,实现磨削硬化加工工件硬度的预测。基于瞬时温度分布和运动非稳定三维热传导微分方程,并考虑砂轮与工件及冷却液与工件交互作用时热传导情况和材料本身的热扩散,建立了磨削温度三维分析预测模型,结合对加工过程奥氏体相位比例的计算及珠光体、残留奥氏体和马氏体的转变等冶金热效应分析,实现磨削硬化加工后工件硬度的预测。将此模型与有限元模型进行对比,并通过试验进行了验证。Grind-hardening process uses the heat generated within the grinding zone in order to produce surface hardening of the workpiece.In this paper,a 3D analytical model to predict grinding temperature is given,the thermo-metallurgical effect is analyzed and the hardness of workpiece after grinding hardening is predicted. Based on the transient temperature distribution and the differential equation of non-steadystate three-dimensional heat conduction, where the interdependence among the grinding wheel, the workpiece and the coolant were described,also the thermal diffusivity in material is considered,this paper presents a 3D analytical model to predict grinding temperature.Combining the calculation for the proportion of the austenite phase and the analysis for the hardness of pearlite,austenite and martensite,the hardness of workpiece machined is predicted. All these are well coincided with the finite element model and the experimental measurement results.

关 键 词：磨削硬化 冶金热效应 三维分析模型 磨削温度 硬度 

分 类 号：TG581.1[金属学及工艺—金属切削加工及机床]