Surface Quality of Aramid Fiber Composites with Ultra-low Temperature and Micro-milling

The micro-milling comparison machining tests were carried out under normal temperature and liquid nitrogen ultra-low temperature environments for aramid fiber composites, the machining surface quality and milling force data were obtained under different parameters and environments. The results show that the ultra-low temperature milling environments may modify the processing materials, reduce the strength, toughness and other properties, making it easy to cut, reducing the occurrence of wire drawing defects, fiber chip breaking thoroughly, and helping to obtain a more excellent surface topography. The ultra-low temperature environment suppresses the generation of ablation defects completely, improves the surface quality of the machined surfaces, and the surface roughness of milled surfaces may reach 2 μm or less. Compared with the normal temperature environments, ultra-low temperature processing may maintain a good milling surface quality at a high feed rate, and may improve the processing efficiency to a certain extent while ensuring the processing quality. The milling forces drop significantly and the tool surface wear is less. The ultra-low temperature processing environments improve the milling performance of the aramid fiber composites and improve the milling surface quality. © 2019, China Mechanical Engineering Magazine Office. All right reserved.