ABSTRACT Carbon/epoxy and carbon/polyimide composites are, respectively, high-performance thermoset and thermoplastic polymer matrix composites being widely utilized in the modern industrial fields due to their superior mechanical/physical properties. However, there is no study available in the literature to differentiate the machining behaviors between these two types of composites. The present paper contributes to the scientific understanding of the drilling characteristics of the two different carbon fiber reinforced polymers (CFRPs). The novelty of the current investigation lies in revealing the fundamental machining behavior of the carbon/epoxy and carbon/polyimide composites and in distinguishing their drilling responses. A comparative drilling study was carried out using the TiAlN-coated twist drills with an emphasis on the analysis of the mechanical/thermal effects of the chip removal process governing the drilling of the thermoset and thermoplastic laminates. Aspects including the drilling forces, machining temperatures, hole diameters, and cylindricity errors were quantified. The results indicate that the machining behaviors of the CFRPs are greatly affected by the presence of the matrix material. The carbon/epoxy composites produce higher drilling forces, higher cutting temperatures, and poorer hole geometrical accuracy than the carbon/polyimide ones, which indicates a much poorer machinability of the thermoset composite. The phenomenon is attributed to the different cutting behaviors of the thermoset and thermoplastic matrices impregnated within the CFRPs.

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碳/环氧树脂和碳/聚酰亚胺复合材料的钻孔特性

摘要 碳/环氧树脂和碳/聚酰亚胺复合材料分别是高性能的热固性和热塑性聚合物基复合材料，由于其优异的机械/物理性能而被广泛应用于现代工业领域。然而，文献中没有可用的研究来区分这两种复合材料之间的加工行为。本文有助于科学理解两种不同碳纤维增强聚合物 (CFRP) 的钻孔特性。当前调查的新颖之处在于揭示了碳/环氧树脂和碳/聚酰亚胺复合材料的基本加工行为，并区分了它们的钻孔响应。使用 TiAlN 涂层麻花钻进行了比较钻孔研究，重点是分析控制热固性和热塑性层压板钻孔的排屑过程的机械/热效应。对钻孔力、加工温度、孔径和圆柱度误差等方面进行了量化。结果表明，CFRPs 的加工行为受基体材料的影响很大。碳/环氧树脂复合材料比碳/聚酰亚胺复合材料产生更高的钻孔力、更高的切削温度和更差的孔几何精度，这表明热固性复合材料的可加工性要差得多。这种现象归因于浸渍在 CFRP 中的热固性和热塑性基质的不同切割行为。