不同粒度的金刚石套料钻钻削碳纤维复合材料时对轴向力及出入口质量的影响

Study on drilling thrust force and quality of exit and entrance in drilling carbon fiber reinforced plastics with brazed diamond core drills of different grain sizes

碳纤维增强复合材料在加工过程中,容易产生分层、毛刺、撕裂等缺陷,还会加剧刀具的磨损。针对以上问题,研制了不同粒度的金刚石套料钻,进行了碳纤维复合材料制孔加工实验,分析了磨粒粒度对轴向力、扭矩和出口质量的影响。得到以下结论:采用有细粒度金刚石的钎焊套料钻可以减小钻孔时的轴向力和扭矩。不同粒度套料钻所加工的孔入口处均未出现任何缺陷,出口处的缺陷主要以撕裂缺陷为主。金刚石粒度80/100的钎焊套料钻在进给速度为100 mm/min,主轴转速15 000 r/min的条件下出入口质量优于其他粒度。

Drilling process of carbon fiber reinforced plastics（CFRP） might lead to the damages such as burrs, delamination and cracking. Focusing on these problems, the experiments were conducted using brazed diamond core drills of different grain sizes. Based on the analysis of the thrust force as well as the quality of entrance and exit of holes, conclusions were got as follows：applying the brazed core drill with small size diamond grains could reduce the thrust force and improve drilling quality. The entrances drilled by different grain sizes diamond core drills had no damages, while the exits had cracks. The entrance and exit quality drilled by core drill with 80/100 diamond grains were better than other core drills under the same parameters（feed speed 100 mm/min and spindle speed 15 000 r/min）.