Abstract: Aramid fiber reinforced polymer (AFRP) milling and grinding composite machining process: Cutting force is larger, cutting temperature is higher, forming surface quality is lower, and so on. The test compares the different cutting environments, i.e., dry cutting, air-cooled, and minimum quantity lubrication (MQL) conditions, analyzes the effect of cutting speed on the surface and side morphology of AFRP, and analyzes the cutting force in the cutting process, cutting temperature, tool wear, and its mutual influence relationship. The results of the study show that using MQL for assisted machining, the AFRP surface has fewer fiber burrs and a higher surface quality at a cutting speed of 157.08 m/min. Compared with the dry cutting environment, the cutting force is reduced by an average of 27.6%, an average of 26.0% reduced the cutting temperature, and the tool wear is significantly reduced under MQL conditions. Compared to the air-cooled environment, the cutting force and cutting temperature are also reduced under MQL conditions, and the type of tool wear changed from scoring wear to fiber adhesion. In addition, the use of higher cutting speeds and MQL-assisted machining processes can effectively reduce the cutting force and cutting temperature, which is more conducive to the improvement of surface quality, which is of guiding significance for defect removal as well as the improvement of surface quality in the AFRP machining process.

Key words: aramid fiber reinforced polymer, milling-grinding composite machining, minimum quantity lubrication, surface morphology, cutting force