The considerable body of literature on the effect of moisture on the mechanical properties of composites has shown that there is a disinclination to use coolant fluids within the composite industry. Tool geometry and cryogenic liquid cooling also have a significant impact on carbon fiber–reinforced plastic machining capabilities. In this paper, the two issues mentioned are improving the drilled hole quality and reducing the amount of CO2 released into the air to protect the environment. The experimental characteristics using a carbide drill with three levels of twist angle of flute and a gas mixture of CO2–N2 were investigated. To verify hole quality, the diameter, the delamination, the uncut fiber area, and the surface roughness were analyzed. With the goal of reducing the amount of CO2 released into the atmosphere, a list of experiments was proceeded in the dry, the air, gas CO2, and a gas mixture of CO2–N2. The thrust force and the temperature were observed. Based on the experiment results, the high helix tool was more advantageous than the triple tool and low helix tool. The difference in the effect of CO2 and CO2–N2 was not significant with the triple tool and the low helix tool; however, the performance of the CO2–N2 gas mixture showed a positive effect on the high helix tool.

中文翻译：

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扭转角和低温气体对碳纤维增强塑料复合材料钻孔质量的实验影响

大量关于水分对复合材料机械性能影响的文献表明，复合材料行业不愿意使用冷却液。刀具几何形状和低温液体冷却也对碳纤维增强塑料的加工能力产生重大影响。在本文中，提到的两个问题是提高钻孔质量和减少释放到空气中的 CO2 量以保护环境。研究了使用具有三个水平的凹槽扭转角和 CO2-N2 气体混合物的硬质合金钻头的实验特性。为了验证孔质量，分析了直径、分层、未切割纤维面积和表面粗糙度。为了减少释放到大气中的二氧化碳量，一系列实验在干燥、空气、气体 CO2 和 CO2-N2 的气体混合物中进行。观察推力和温度。根据实验结果，高螺旋刀具比三螺旋刀具和低螺旋刀具更具优势。三重工具和低螺旋工具的 CO2 和 CO2–N2 的影响差异不显着；然而，CO2-N2 气体混合物的性能对高螺旋刀具产生了积极影响。