基于超细晶硬质合金钻头的AFRP钻削性能

Drilling performance of ultrafine cemented carbide drill in machining aramid fiber reinforce polymer composites

采用超细晶硬质合金钻头开展了芳纶纤维增强树脂基复合材料(Aramid Fiber Reinforce Polymer Composites,AFRP)的钻削实验,从钻削力、钻削温度、制孔质量、刀具磨损等方面对比分析了超细晶硬质合金钻头与普通硬质合金钻头的钻削性能。实验结果表明:芳纶纤维增强树脂基复合材料钻削过程中,钻削力随进给速度的增大而增大,随主轴转速的增大而减小,超细晶硬质合金钻头的钻削力比普通硬质合金钻头降低了40.6%以上;钻削温度随进给速度的增大而减小,随主轴转速的增大而增大,相对普通硬质合金钻头,采用超细晶硬质合金钻头的钻削温度降低了47~85℃;超细晶硬质合金钻头钻削产生的拉毛和热损伤明显少于普通硬质合金钻头;经过长时间的钻削,普通硬质合金钻头的橫刃和主切削刃出现了崩刃,后刀面出现了严重的磨料磨损;而超细晶硬质合金钻头由于高硬度和高耐磨性等特性,刀具的磨损相对较小,适合于芳纶纤维增强树脂基复合材料的高效低损伤加工。

The drilling test was carried out with ultrafine cemented carbide drills to machine aramid fiber reinforce polymer composites （AFRP）, and the drilling performance of the ultrafine cemented carbides drills was compared with that of conventional cemented carbides drills at the same conditions. The test results show that drilling force in- creases with the feed speed and decreases with the spindle speed, the drilling force of the ultrafine cemented carbides drill decreases by 40.6% compared with conventional cemented carbide drills. Drilling temperature decreases with the feed speed and increases with the spindle speed, and the drilling temperature is reduced by 47 - 85-C. The burr and thermal damage produced by the ultrafine cemented carbide drills are less than that of produced by the conven- tional cemented carbide drills, the chisel edge and the major cutting edge of the conventional cemented carbide drills exhibits tipping, and the flank faces appear severe abrasive wear after a long drilling. The wear rate of the ultrafine cemented carbide drill is relatively lower due to high hardness and resistance of the drill material, which is suitable for high efficiency and low damage in machining AFRP composites.