Wear mechanism of double point angle drill bit in drilling CFRP composites
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摘要: 为了研究碳纤维增强树脂基(CFRP)复合材料切削中刀具在不同部位的磨损机制和规律,以典型的硬质合金双顶角钻头作为研究对象,主要研究对出口分层影响较大的横刃和对最终制孔成型影响较大的第二主切削刃的磨损机制及规律。通过减小磨损测量间隔,并引入切削刃钝圆半径以及后刀面磨损带宽度,表征了横刃和第二主切削刃在加工中的衰变过程。基于显微刃口观测和钝圆半径变化,揭示横刃易崩刃和第二主切削刃磨损后又受到重新刃磨的磨损机制,获得了此类型钻头不同部位的磨损规律。同时,基于上述的磨损表征,研究不同切削部位磨损量对钻削轴向力和力矩的影响,横刃轴向力与横刃钝圆半径变化相关性较小,而钻削最大力矩与第二主切削刃后刀面磨损变化规律相一致。
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关键词:
- 碳纤维增强树脂基复合材料 /
- 双顶角钻头 /
- 磨损机制 /
- 切削刃钝化 /
- 后刀面磨损
Abstract: In order to investigate the wear mechanism and variational law at the different cutting edges of the cutting tool used for machining carbon fiber reinforced plastics (CFRP), based on the typical tungsten carbide double point angle drill, the wear mechanism and law of influence on the hole-exit delamination at the chisel edge and influence on the final drilling quality at the secondary cutting edge were analyzed, respectively. By reducing wear measurement interval of the drill bit, and introducing the values of cutting edge rounding and flank wear width, the wear recession of the chisel edge and the secondary cutting edge in the drilling were characterized. By means of the microscope measurement of the cutting edge and the calculation of cutting edge rounding, it is found that chipping is dominant at the chisel edge and secondary cutting edge is reground and re-sharpened after flank wear. The wear law of this type of double point angle drill was also obtained, and the effects of wearing capacity on thrust force and drilling torque were analyzed based on the tool wear results. The results show that thrust force caused by the chisel edge has weak correlation with the cutting edge rounding of chisel edge, and the drilling torque corresponds well with the flank wear of the secondary cutting edge.
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