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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。
Carbon fiber composites drilling delamination is mainly caused by the stripping of the entrance to the drill hole and the exit of the exit. Axial drilling thrust is the main reason for stratification. Controlling axial thrust can improve hole quality. According to the axial force model of three kinds of existing technology, the critical axial force and diameter ratio of the three kinds of technological schemes are compared and analyzed, Axial force and drilling depth and axial force and feed rate relationship, and the use of SEM to observe the hole quality. The results show that the use of step drilling and pre-hole drilling can significantly reduce the axial thrust to obtain high-quality hole exit.