CFRP复合材料超声振动套孔分层抑制机理分析

针对碳纤维增强复合材料在传统钻孔过程易出现分层缺陷,采用金刚石空心套刀和超声振动加工技术进行了CFRP超声振动套孔分层抑制机理分析。理论分析了传统麻花钻钻孔与金刚石套刀普通套孔过程的分层机理及评价,超声振动套孔对分层抑制的机理,并且进行了实验验证。结果表明:相比于CFRP普通套孔,超声振动套孔能够有效提高套刀切削性能和排屑效果,降低钻削力12.5%～19.2%,抑制切屑粉尘黏附套刀和料芯堵塞套刀,抑制CFRP分层缺陷形成,改善孔表面质量。

Analyses of Delamination and Suppression Mechanism During Ultrasonic Vibration Core Drilling of Carbon Fiber Reinforced Plastics (CFRP)

To solve the delamination defect that was easy to occur in the traditional drilling process of carbon fiber reinforced plastics (CFRP), the analyses of delamination and suppression mechanism during ultrasonic vibration core drilling (UVCD) of CFRP were implemented based on the diamond core drill and ultrasonic vibration machining technology. The delamination mechanism and evaluation in traditional drilling of twist drill and common core drilling (CCD) of diamond core drill were analyzed by theoretical method, the delamination suppression mechanism of UVCD was also analyzed, which was verified by experimental method. The results show that compared with the CCD of CFRP, the UVCD can effectively improve the cutting performance and chip removal effects of diamond core drill, reduce the thrust force by 12.5%~19.2%, suppress the chip adhesion and rod jamming of diamond core drill, suppress the formation of delamination defect of CFRP as well as improve the surface quality of machined hole.