蓝宝石玻璃超声振动辅助磨削试验研究

Experimental Study on Ultrasonic Vibration Assisted Grinding of Sapphire Glass

为了探究烧结磨头不同磨头参数和磨削参数对蓝宝石玻璃磨削特性的影响,综合考虑了磨头粒度号、主轴转速、进给速度、磨削深度等因素,设计并开展了非超声和超声振动辅助磨削加工试验,研究了上述因素对蓝宝石磨削表面粗糙度、表面形貌及磨削力的影响。结果表明,超声和非超声磨削工况中,磨头粒度号增大对磨削力和表面粗糙度的影响整体均呈现先增大后减小的趋势。不同磨头粒度号工况下的超声磨削力和表面粗糙度普遍小于非超声结果,磨削力最大降幅为27.2%,表面粗糙度最大降幅为18.6%;采用粒度号200/230#的磨头进行磨削,可获得相对较小的切削力和表面粗糙度,是研究工况下的最佳粒度号,而140/170#的使用效果最差。相比于非超声磨削,超声可在所选的主轴转速、进给速度和磨削深度条件下实现磨削力和表面粗糙度不同程度的降低,在小主轴转速和小磨削深度工况下,超声磨削对蓝宝石表面质量的改善作用更显著。

In order to explore the influence of different grinding head and grinding parameters on the grinding characteristics of sapphire glass,an experimental study on ultrasonic vibration assisted grinding was designed and carried out considering the effects of four factors:grinding head parameters,spindle speed,feed rate,and grinding depth.In the experiment,the influence of the above factors on the surface roughness,surface morphology,and grinding force of sapphire glass grinding was studied.The experimental results show that under ultrasonic and non-ultrasonic grinding conditions,the grinding force and surface roughness shows an overall trend of first increasing and then decreasing with increase of the particle size number of the grinding head.Under the selected grinding head particle size,the grinding force and surface roughness of ultrasonic grinding are generally smaller than those of non-ultrasonic grinding,the maximum reduction of grinding force is 27.2%,and the maximum reduction of surface roughness is approximately 18.6%.The grinding using 200/230#grinding head obtained a relatively smaller grinding force and surface roughness.The 200/230#grinding head is the best grain size under the research condition while the 140/170#is the worst.Compared with non-ultrasonic grinding,ultrasonic grinding can reduce the grinding force and surface roughness at the selected spindle speed,feed rate,and grinding depth.Moreover,ultrasonic grinding can better improve the surface quality of sapphire glass at a small spindle speed and grinding depth.