Research on micro-grinding performance of 2.5D C_f/SiC composites

In order to improve the micro-grinding quality of 2.5D carbon fiber-reinforced silicon carbide ceramic matrix (2.5D C_f/SiC) composite materials, their characteristics under different grinding parameters were investigated in this study. Firstly, theoretical models for the undeformed chip thickness and micro-grinding force were established. Then, orthogonal and single-factor experiments were conducted using 0.9-mm-diameter micro-grinding tools electroplated with 500# diamond abrasive particles. Through the range and variance analysis of the orthogonal experimental results, the order in which grinding parameters affect the grinding performance of 2.5D C_f/SiC composites was obtained. Single-factor experimental results indicate that the theoretical model of the micro-grinding force shows consistent trends with the experimental results. As the grinding depth a_p and the feed speed v_w increase, the grinding force, the surface roughness Ra, and surface defects after micro-grinding also increase, indicating that the grinding performance of 2.5D C_f/SiC composites gradually deteriorates. On the contrary, increasing the grinding speed v_s can improve their grinding performance. Based on the established theoretical model, the reasons for the variation of grinding force, surface morphology, and surface roughness with grinding parameters were elaborated. This research would supply a basis for understanding the micro-grinding performance and provide guidance for improving the micro-grinding quality of 2.5D C_f/SiC composites.