电加工与模具

为研究微晶玻璃超声辅助磨削制孔过程中工艺参数对小孔内壁表面质量及出口崩边的影响，在超声振幅3μm、频率20 kHz条件下，采用有限元方法分析了加工过程中磨削力随着主轴转速、进给速度等工艺参数变化的规律。利用五轴加工机床分别开展了超声辅助磨削与普通磨削的加工试验，对比了工件表面粗糙度及出口崩边状况。结果表明：相同工艺参数下，超声辅助磨削相较于普通磨削，可显著减小磨削力，加工小孔的崩边尺寸更小，工件表面质量更好。

To study the effect of ultrasonic grinding parameters on the surface quality and edge breakage at hole outlet of microcrystalline glass,the ultrasonic amplitude of 3 μm and vibration frequency of 20 kHz were selected in finite element method to analyze the changes of grinding force with the process parameters(feed speed,rotation speed). The force changes of ordinary grinding and ultrasonic grinding under the same process parameters were compared. Then,ultrasonic assisted grinding and ordinary grinding were carried out on five-axis machine tool to compare the surface roughness of the workpiece and the edge breakage at the outlet. The results showed that ultrasonic assisted grinding can significantly reduce the grinding force compared with ordinary grinding,and the experimental results also showed that the small hole edge breakage size under ultrasonic assisted grinding is smaller than that of ordinary grinding.