利用螺旋铣变偏心距加工的特点,提出了在刀具回程过程中进行二次精加工的工艺策略.通过正交试验研究了回程各工艺参数对CFRP/Ti-6Al-4V叠层孔加工质量和加工精度的影响规律,并依此优化工艺参数.试验结果显示:采用优化参数的回程精加工工艺提高了叠层孔的制孔精度,避免了复合材料孔壁加工损伤,复合材料孔粗糙度均值从Ra3.52降低到Ra1.31,入口撕裂明显改善,钛合金孔出口无毛刺.
A strategy was proposed to proceed the secondary fine processing when the cutting tool returned by fully taking advantage of eccentricity machining feature of orbital drilling.The effect laws of return processing parameters to machining quality and precision of the stacked materials were researched by conducting orthogonal experiments, and the resultant optimized machining parameters were determined.The experiment results show that optimized return machining process can improve hole accuracy of CFRP/Ti-6Al-4V stacks and avoid the scratch defects of the hole wall of CFRP.An average value of CFRP hole roughness decreases from Ra3.52 to Ra1.31.Less tear formation occur at the CFRP hole entry and no burrs forms at the Ti-6Al-4V hole exit.
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