磨削淬硬热力相变数值分析

磨削淬硬技术是以磨削力做功产生足够的热量,以达到奥氏体相变温度,工件表面需承受高温、磨削力和相变等的综合作用。文章基于磨削淬硬热力相变作用,进行了温度场有限元分析和结构分析,通过耦合有限元法计算了三种高度不同工件加载过程中不同时刻工件应力-应变分布及变形情况、工件内部应力—应变分布情况以及工件高度对工件变形的影响规律。结果表明:应力、应变集中在工件表层,在磨削弧区其值最大,越远离工件表面,应力、应变越小;相同加工参数下,工件越高,应力、应变集中区域所占工件体积比例越小,总体变形也较小。

Thermal-mechanical-phase transition numerical analysis of grinding hardening

The grinding hardening technology needs grinding force to get enough heat to reach the austenitic temperature. The workpiece in grinding hardening withstands high temperature,grinding force and phase transition. Based on the combined effects of thermal phase transitions,the paper analyzes grinding temperature FE analysis and structural analysis. The paper uses thermo-mechanical coupling module to simulate the thermal deformation for surface grinding hardening of three kinds of workpiece sizes. The stress,strain and deformation in different loaded time are calculated out. The effect of wokrpiece height to grinding deformation is also included. The result is as follows： The stress and strain concentrated on the workpiece surface. The maximum stress and strain is in grinding contact arc. The further away from the surface,the less the stress and strain. The higher the workpiece is with same grinding parameter,the lower the ratio of strain-stress concentration is.