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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。
Grinding hardening is the use of heat generated during the grinding process, the mechanical composite surface directly to the workpiece surface hardening of the new technology. In this paper, through the establishment of three-dimensional analysis of grinding temperature model and metallurgical thermal effect analysis, to achieve the hardness of the workpiece grinding hardness prediction. Based on the instantaneous temperature distribution and the kinematic non-stationary three-dimensional heat conduction differential equation, the three-dimensional analysis prediction model of grinding temperature was established considering the thermal conduction between the grinding wheel and the workpiece and the interaction between the coolant and the workpiece and the thermal diffusion of the material itself. Calculation of the phase ratio of the austenite and the metallurgical thermal effect analysis such as the transformation of pearlite, retained austenite and martensite, so as to predict the hardness of the workpiece after grinding and hardening. This model is compared with the finite element model and verified by experiments.