| Popis: |
Grinding methods have been widely used in orthopedic surgery, which has high requirements for surface quality, grinding force and temperature control. It is necessary to explore the influence of micro-grinding parameters on the grinding force temperature from a microscopic perspective. This paper describes the micro structure, composition and thermodynamic properties of bone. From the perspective of the single abrasive grain, the single abrasive grain cutting model is established, and the single abrasive grain cutting force equation is derived. ABAQUS is used to establish a 2D cutting simulation model of abrasive grains, and the internal structure of the bone material is considered, and the bone micro structure model (including osteon orientation , matrix, cement line ) is established. The simulation study is carried out on the cutting direction of the abrasive grains in parallel, vertical and cross with the axial unit axis. The study of the relationship between force and temperature and cutting parameters shows that the abrasive cutting force increases with the increase of grinding speed and grinding depth. The cutting force is the largest in the vertical cutting mode, the cutting force is the second in the cross cutting mode, and the cutting force is the smallest in the parallel cutting mode. Finally, the comparison between theory and simulation shows that the theoretical analysis results are consistent with the finite element simulation results, which verifies the correctness of the theoretical model of single abrasive grain cutting force. |
