Polyimide (PI) and polyetheretherketone (PEEK) are superior high‐performance thermoplastics being extensively used in the fields of fiber‐reinforced polymer composites. However, there is very limited literature addressing the machining behavior of the PI and PEEK composites. The present paper aims to conduct a comparative study into the machining characteristics of these two representative high‐performance thermoplastic matrix composites under varying cutting conditions. Machinability aspects of the carbon/PI and carbon/PEEK thermoplastic composites were evaluated in terms of drilling forces, machining temperatures, delamination damage, surface morphologies, hole dimensional accuracy and tool wear. The results indicate that the carbon/PEEK composites generally show a much poorer machinability than the carbon/PI composites in terms of higher drilling forces, higher cutting temperatures, larger delamination extents and excessive tool wear. Since the carbon/PEEK composites exhibit certain ductility leading to the continuous chip formation, the cut hole surface morphologies and dimensional accuracy are much better than those gained in the carbon/PI composites. Both the cutting speed and the feed rate affect significantly the drilling forces and the resulting delamination damage. The fundamental wear mechanisms of drilling carbon/PI composites are abrasion wear in the form of edge rounding and slight chip adhesion, while for the carbon/PEEK composites, they are abrasion, serious chip adhesion because of the high drilling temperatures promoted at the drill‐work interface and catastrophic failures of coating peeling and edge fracture.

中文翻译：

---

碳纤维增强聚酰亚胺和PEEK热塑性复合材料的加工性能

聚酰亚胺（PI）和聚醚醚酮（PEEK）是卓越的高性能热塑性塑料，广泛用于纤维增强聚合物复合材料领域。但是，关于PI和PEEK复合材料的加工性能的文献非常有限。本文旨在对这两种具有代表性的高性能热塑性基体复合材料在不同切削条件下的加工特性进行比较研究。对碳/ PI和碳/ PEEK热塑性复合材料的可加工性方面进行了钻孔力，加工温度，分层破坏，表面形态，孔尺寸精度和工具磨损方面的评估。结果表明，就更高的钻削力，更高的切削温度，更大的分层程度和过度的刀具磨损而言，碳/ PEEK复合材料的可加工性通常比碳/ PI复合材料差得多。由于碳/ PEEK复合材料表现出一定的延展性，导致连续切屑形成，因此切孔表面形貌和尺寸精度比碳/ PI复合材料要好得多。切削速度和进给速度都会显着影响钻削力和由此造成的分层损坏。碳/ PI复合材料钻孔的基本磨损机理是边缘倒圆和轻微的切屑粘附形式的磨损，而碳/ PEEK复合材料则为磨损，