In this study, polypropylene composite reinforced with carbon fibers and calcium carbonate nano-particles is manufactured. Mechanical properties tests showed that composite sample containing nano-particles has 87% more tensile strength, 26% more bending strength and 40% more impact strength than the composite without nano-particles. Then high speed drilling was performed on the composite sample containing nano-particles. After drilling, the holes inlet opening surface was detected for uncut fibers and delamination defects. Dimensional tolerance of the holes inlet opening diameter, holes geometrical tolerances including circularity and cylindricity and also surface topography at the inner wall of the holes were investigated. The amount of uncut carbon fibers has direct relation with feedrate and reverse relation with spindle speed variations. With simultaneous increase of feedrate and spindle speed, uncut fibers are reduced. For each level of feedrate, with increasing spindle speed, the delamination defect decreases. The effect of spindle speed variations on the dimensional tolerance is far larger than the effect of feedrate changes. At low spindle speeds, the effect of feedrate changes on the geometrical tolerance variations is much higher. Optimal dimensional and geometrical tolerances are obtained in condition of the highest spindle speed and lowest feedrate. Although, increasing feedrate at very high levels of spindle speed leads to relative improvement in the drilling tolerances. Drilling with relatively lower feedrates and higher cutting speeds leads to better surface topography at the inner wall of the holes, consequently less surface defects such as cavity, debonding, matrix destroying, fiber pull-out and fiber dust are happened.

在这项研究中，制造了用碳纤维和碳酸钙纳米颗粒增强的聚丙烯复合材料。力学性能测试表明，含有纳米颗粒的复合材料比不含纳米颗粒的复合材料拉伸强度提高87%，弯曲强度提高26%，冲击强度提高40%。然后对含有纳米颗粒的复合样品进行高速钻孔。钻孔后，检测孔入口开口表面是否有未切割的纤维和分层缺陷。研究了孔入口直径的尺寸公差，孔的几何公差，包括圆度和圆柱度，以及孔内壁的表面形貌。未切割碳纤维的数量与进给率成正比，与锭子转速变化成反比。随着进给率和锭子速度的同时增加，未切割的纤维减少。对于每一级进给率，随着主轴转速的增加，分层缺陷减少。主轴转速变化对尺寸公差的影响远大于进给率变化的影响。在低主轴转速下，进给率变化对几何公差变化的影响要高得多。在最高主轴速度和最低进给率的条件下获得最佳尺寸和几何公差。尽管如此，在非常高的主轴速度水平下增加进给率会导致钻孔公差的相对改善。以相对较低的进给率和较高的切削速度进行钻孔可在孔内壁获得更好的表面形貌，从而减少表面缺陷，例如空腔、脱粘、