基于分段变磨削力的磨削强化层仿真

Simulation on Grind-hardening Layers Based on Piecewise Variable Grinding Forces

分析了磨削强化工艺过程中实际磨削时间以及磨削过程中磨削力的变化规律,提出了分段变磨削力磨削温度仿真方法来预测磨削强化层深度分布。首先对磨削力进行离散,计算相应的热流密度;然后将热流密度按砂轮与工件实际接触长度依次施加到工件的磨削表面,对工件磨削过程中的温度场进行仿真分析,得到了磨削强化层的分布;最后将所提出仿真方法与实验和传统仿真方法进行了比较分析。结果表明,基于分段变磨削力仿真可以更准确地预测工件沿磨削方向的磨削强化层分布。

The actual grinding time and the variation of grinding forces during the grinding processes were analyzed.A grinding temperature simulation was put forward to predict the distribution of grind-hardening layer depths based on piecewise variable forces.Firstly,the grinding forces were discretized,and the corresponding heat flow density was calculated.Then,according to the actual contact length between the grinding wheel and the workpiece,the heat flow density was loaded onto the grinding surface,and the temperature field of the workpiece was simulated and analyzed.So the distribution of the grind-hardening layer was obtained.Finally,the comparison and analysis were carried out by the experiments and the traditional simulation method.The results show that the simulation may be more accurate to simulate the distribution of the grind-hardening layers along the grinding directions.