Experimental studies on the performance of different structure tools in drilling CFRP/Al alloy stacks
Experimental studies on the performance of different structure tools in drilling CFRP/Al alloy stacks
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DOI：
10.1007/s00170-015-6955-z
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Lin Zhang;Zi-Hao Liu;W. Tian;W. Liao
中科院分区：
文献类型：
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作者：
Lin Zhang;Zi-Hao Liu;W. Tian;W. Liao
采用不同结构的钻头分别对CFRP和7075铝合金叠层材料进行钻削对比试验，研究了工艺参数和刀具对孔加工精度、粗糙度、毛刺高度和切削力的影响。结果表明，新型结构CVD金刚石涂层钻头在无冷却液条件下钻削CFRP/Al叠层时的综合切削能力明显高于传统麻花钻。最佳工艺参数为：转速4000 r/min，进给量0.04 mm/r，在此工艺条件下，孔径精度可达H8，复合材料收缩率可控制在5 μ m以内，孔壁粗糙度满足行业要求（CFRP：Ra ≤ 3.2 μ m，Al：Ra ≤ 1.6 μ m）。随着刀具磨损，基体开裂和较大的回卷裂纹将变得明显。在保证质量和精度的前提下，刀具至少可用于400个孔。
Contrast experiments, in which CFRP and 7075 aluminum alloy stacked materials were drilled with different structure drills respectively, were carried out to assess how process parameters and tools affected hole accuracy, roughness, and burr height as well as cutting force. The results showed that comprehensive cutting ability of the new structure CVD diamond-coated drill was significantly higher than that of the traditional twist drill when drilling CFRP/Al stacks without coolant. The best process parameters were at the speed of 4000 r/min, the feed rate of 0.04 mm/r, with which the aperture accuracy could reach H8, composite shrinkage could be controlled in less than 5 μm and hole wall roughness also meet industry needs (CFRP: Ra ≤ 3.2 μm, Al: Ra ≤ 1.6 μm). Matrix cracking and larger rolled-back burrs would be apparent with the tool wear. On the premise of ensuring the quality and accuracy, the cutting tool could be used for 400 holes at least.