Carbon fiber-reinforced polymer (CFRP) composites have been widely used in the aerospace industry due to their excellent mechanical properties. CFRP machining is still a challenging task for manufacturers due to its high temperature-sensitivity and poor machinability. Cryogenic machining is believed to be an effective and eco-friendly way to solve the aforementioned problem. This work primarily compared the machinability and machined surface quality of CFRP laminates under dry and supercritical CO₂ (scCO₂)-based cryogenic conditions. A series of tests were carried out under different cutting conditions, in which the feed rate, cutting speed, and cooling method were considered. To reveal the material removal mechanisms under different cooling conditions, the tribology and micro-hardness tests were innovatively carried out under different temperatures. The obtained results show that the scCO₂-based cooling method is suitable for machining CFRP materials. Under cryogenic cutting conditions, the machined surface quality is considerably improved despite that the cutting force presents higher magnitudes compared to those under dry cutting. The improvement of surface quality under cryogenic cooling method is attributed to avoidance the degradation of material properties caused by high temperatures during dry cutting.

碳纤维增强聚合物（CFRP）复合材料由于其优异的机械性能在航空航天工业中得到了广泛的应用。CFRP 加工对制造商来说仍然是一项具有挑战性的任务，因为它具有较高的温度敏感性和较差的可加工性。低温加工被认为是解决上述问题的有效且环保的方式。这项工作主要比较了 CFRP 层压板在干燥和超临界 CO ₂ (scCO ₂) 为基础的低温条件。在不同的切削条件下进行了一系列试验，其中考虑了进给速度、切削速度和冷却方式。为了揭示不同冷却条件下的材料去除机制，创新性地进行了不同温度下的摩擦学和显微硬度测试。所得结果表明，基于scCO ₂的冷却方法适用于加工CFRP材料。在低温切削条件下，尽管切削力比干切削条件下的切削力更高，但加工表面质量得到了显着改善。低温冷却方式下表面质量的改善归因于避免了干切削过程中因高温引起的材料性能下降。