超声辅助磨削SiCf/SiC陶瓷基复合材料

针对碳化硅纤维增强陶瓷基复合材料(SiC_f/SiC)存在加工质量差、刀具磨损严重等问题，开展金刚石砂轮端面超声辅助磨削SiC_f/SiC复合材料试验，对比研究超声辅助磨削和普通磨削SiC_f/SiC过程中的磨削力、表面形貌及表面粗糙度，并分析其材料去除机理。结果表明:超声辅助磨削可有效降低磨削力；超声作用能促使SiC纤维断裂，形成较短纤维而被去除，减少了纤维的折断和剥落，提高了其表面加工质量；在纵向振动端面磨削条件下，超声振幅在一定范围内有助于改善其表面加工质量，振幅过大则会导致表面冲击作用过强而使其表面质量降低。 

Ultrasonic assisted grinding of SiCf/SiC composites

SiC fiber reinforced SiC ceramic matrix composites (SiC_f/SiC) have problems such as poor machining quality and severe tool wear. To study these problems, SiC_f/SiC composites were processed by ultrasound-assisted grinding, and the grinding force, surface morphology and three-dimensional surface roughness were tested and explored. The removal mechanism of materials in ultrasound-assisted grinding was analyzed. The results show that ultrasonic assisted grinding can effectively reduce grinding force. The ultrasonic effect promotes the fracture of SiC fibers and the formation of shorter fibers to be removed, which reduces the fiber breaking and peeling and improves the surface quality, but the large amplitude of vibration is not conducive to the improvement of the surface quality.