Simulation Research on Vibration Cutting Mechanism of Metal Matrix Composites

摘要

Particle-reinforced metal composite materials have been widely used in the industry due to their excellent abrasion resistance and high strength,but they are typical hard-to-machine materials.A finite element model of the material matrix and enhanced particles have been established by the parametric modeling in this paper.Different from the previous development process,the particle is randomly distributed in this study,so the particle distribution has been better simulated than ever.The study shows that vibration-cutting particle-reinforced composites have reduced the phenomenon of particle suspension on the machined surface compared to conventional cutting,and the high-elastic-modulus reinforcing particles have been subjected to high stress,and the matrix between the particles have acted as a stress-transmitting"channel".When the particle's diameter is 20|rm and the volume fraction is 30%,there is a stress transmitting channel in a certain range away from the tool tip.When the cutter contacts the particles,the vibration cutting will cause the initial crack near the particle,which cut off part of the stress transmitting channels,make the stress concentrated on the tool tip and lead to the material easier to remove.