齿轮成形磨削淬硬温度场与组织场仿真研究∗

摘要

In order to reflect the actual temperature and microstructure distribution during the form grind-hardening process,the temperature field of cooling process and the microstructure transformation was simula-ted by means of employing the ABAQUS secondary development according to FORTRAN rules for writing code and user subroutine interfaces ( DFLUX,USDFLD) ,based on the mathematical model of thermody-namics and kinetics of phase transformation. The method can predict temperature changes in different direc-tions and martensite distribution after grind-hardening. In addition,the hardened layer depth can be calculated which is the evaluation index of hardenability. The results show that, material 0. 32mm below the surface will activate the transformation and the depth of hardened layers is about 0. 291mm. The simulation plays a guiding role in the control of transformation of martensite in gear form grind-hardening process.%为了真实反映成形磨削淬硬过程中温度、组织分布状态,基于热力学和相变动力学数学模型,根据ABAQUS用户子程序接口DFLUX、USDFLD,按照FORTRAN语法规则编写代码对CAE软件进行二次开发,模拟分析了成形磨削淬硬包括冷却全过程的温度场及组织转变过程,预测工件在不同方向的温度变化及磨削淬硬完成后马氏体组织分布情况,计算工件淬硬层深度,评定其淬透性。结果表明,距表层0.32 mm以上的材料将激活相变,淬硬层深度约为0.291 mm。仿真模拟对磨削淬硬中控制马氏体转变量具有一定的指导作用。