碳纤维复合材料小孔加工的试验研究

Experimental Study on Small Hole Machining of Carbon Fiber Reinforced Composites

针对碳纤维复合材料小孔加工比常规尺寸的孔加工更困难,制孔质量和尺寸精度难易保证的问题,采用硬质合金麻花钻进行碳纤维增强树脂基复合材料直径3mm小孔的钻削试验,研究工艺参数、刀具磨损对切削力和制孔质量的影响。结果表明:转速和进给速度对制孔轴向力和孔径误差均有显著影响;回归分析得到了轴向力与转速和进给速度之间的关系式;转速对孔径误差的影响大于进给速度的影响;硬质合金麻花钻加工碳纤维复合材料的合格孔数为30个,孔径误差随刀具磨损量的增大而增大。研究结果可以对碳纤维复合材料小孔加工的切削力进行预测,为加工参数和刀具寿命的合理选择提供试验依据。

Small hole machining for carbon fiber reinforced composites is more difficult than the conventional size hole machining. Drilling quality and size precision are difficult to guarantee. Aims at this problem, 3ram diameter hole drilling experiments were carried out of carbon fiber reinforced resin matrix composites using the carbide twist drill. The influence of the process parameters and tool wear on cutting force and hole quality were researched. The results show that the spindle speed and feed speed have remarkable effects on the thrust force and the hole diameter error. The relation between thrust force and spindle speed and feed speed is obtained by regression analysis. The influence of the spindle speed on the hole diameter error is greater than the influence of the feed rate. The number of the qualified hole is 30 when carbide twist drill is adopted to drilling the carbon fiber reinforced composites. Hole diameter error increases with the tool wear. The research results can predict the cutting force of the small hole machining of carbon fiber reinforced composites and provide experimental basis for the reasonable selection of mavhining parameters and tool life.