碳纤维复合材料不同制孔工艺技术研究

STUDY ON DIFFERENT TECHNOLOGY PROCESS OF DRILLING CARBON FIBER REINFORCED PLASTICS

碳纤维复合材料钻孔分层主要由钻孔入口的剥离作用和出口的推出作用所引起。轴向钻削推力是分层的主要原因,控制轴向推力可以提高制孔质量。设计无预制孔的麻花钻、带预制孔的麻花钻和阶梯钻三种钻孔工艺方案,根据现有三种工艺的轴向力模型,分析对比三种工艺方案的临界轴向力与直径比率、轴向力与钻削位置深度及轴向力与进给率关系,并使用SEM观察孔的质量。结果表明,使用阶梯钻和预制孔钻削能大幅减少轴向推力,获得高质量的孔出口。

Drilling induced delamination often caused the peeling at the entrance and the pushing at the exit of composite materials. Because of the thrust force being the main factor of delamination, it was necessary to control the thrust force for improving hole quality. This paper designs three different drill process consist of twist drill （ with- out pilot hole）, twist drill （with pilot hole） and step drill. Based on the existing axial thrust force model of these processes, the thrust force at the beginning of delamination with diameter ratio, the thrust force with hole depth and feed rate were analyzed, and the hole quality was observed by SEM. The results indicate that step drill and pilot hole can drastically decrease the thrust force and improve the hole quality.