基于单颗磨粒磨削的超声振动参数与磨削参数匹配性研究

Study on Matching Performance of Ultrasonic Vibration and Grinding Parameters Based on a Single Abrasive Grinding

超声辅助磨削是一种适于加工陶瓷等硬脆材料的先进复合加工技术。超声辅助磨削过程中,超声振动参数与磨削用量的匹配性决定了超声振动作用对磨削过程的影响程度,目前尚缺乏深入的研究。针对这一问题,采用单颗磨粒工具对Si C陶瓷工件抛光表面进行超声辅助磨削及普通磨削试验,通过单颗磨粒磨削力、力比、磨削划痕形貌的对比,分析超声振动作用对磨削过程的影响随磨削用量变化的规律。结果表明,相同条件下单颗磨粒超声辅助磨削的磨削力与力比均小于普通磨削时;磨削用量较小时,单颗磨粒超声辅助磨削划痕形貌呈明显的锤击作用及断续磨削特征。随磨削用量的增大,超声辅助磨削过程中的锤击作用显著弱化,断续磨削特征趋于消失,两种方法之间的磨削力差异减小,即超声振动参数与磨削用量的匹配性变差。

Ultrasonic assisted grinding （UAG） is an outstanding combined processing technology suitable to machine hard brittle materials such as advanced ceramics. During UAC~ the effect of ultrasonic vibration on grinding process is determined by matching performance of ultrasonic vibration and grinding parameters. However, it is still lack of deep study. In response to this problem, a single abrasive tool is adopted to conduct UAG and conventional grinding （CG） tests on polished surface of SiC. Through comparison of grinding force, grinding force ratio and scratch morphology, the effect of ultrasonic vibration on grinding process along with changing grinding parameters is analyzed. The results show that the grinding force and grinding force ratio produced by UAG are lower than those produced by CG under the same conditions. In addition, the grinding scratch morphology produced by the single abrasive presents significant hammering and intermittent characteristics when grinding parameters are low. However, the hammering is weakened evidently and intermittent grinding tends to disappear with increasing grinding parameters. Accordingly, the difference of grinding force between UAG and CG decreases significantly, i.e., the matching performance between ultrasonic vibration and grinding parameters get worse.