基于尺度效应的超声珩磨磨削力建模及仿真

Modeling and Simulation of Grinding Force on Ultrasonic Honing Based on the Scale Effect

为从微观研究功率超声珩磨机理,考虑了材料的尺度效应,采用基于细观机制的应变梯度塑性理论(MSG),建立了单油石磨削力模型及比磨削能模型,并对其进行了仿真分析。结果表明:考虑尺度效应时磨削力有所增大。对磨削力影响最大的参数是珩磨深度,珩磨深度低至某一阈值(约1.4μm)后,随着珩磨深度的继续减小,磨削力呈现非线性增大的趋势。当珩磨深度低于4.4μm继续降低时,比磨削能也会非线性增大。因此,材料在微尺度时变得难以切除。

In order to research the mechanism of power ultrasonic honing from the microcosmic,considering the scale effect of the material,using the strain gradient plasticity theory based on the dislocation mechanism（ MSG）,establishing a single whetstone grinding force model,the specific grinding energy model,then simulating and analyzing them,simulation results show： the same trend with a series of other micro-cutting researches. The most influential parameter on the grinding force model is honing-depth,when honing-depth reduces to a certain threshold（ about 1. 4μm）,with the honing-depth continuing to decrease,grinding force shows the trend of nonlinear increase. When the honing-depth is less than 4. 4μm then decreases,the specific grinding energy also increases nonlinearly. Therefore,the material becomes difficult to removal under the microscale.