Study on grinding force of Si3N4 ceramics in random rotation grinding with truncated polyhedral grains

摘要

Grinding force is the most important characteristic parameter in the study of grinding machining mechanism, and it has an important influence on the quality of the machined surface and the service life of the grinding wheel. Accurate prediction of grinding force is significant to process improvement, machine tool design, and condition diagnosis. This paper uses the ABAQUS software to simulate the end grinding process of Si3N4 ceramics. In the abrasive removal model, in order to express the complex grinding conditions of the fine-grained grinding wheel better, this paper adopts the truncated polyhedral abrasive grain model, and the abrasive grains are randomly rotated multiple times to verify the model, which reduces the simulation grinding force error caused by the randomness of irregular abrasive grain model and improves the prediction accuracy. This paper establishes an abrasive grain distribution model, the unit number of abrasive grains is calculated from the equivalent volume of abrasive grains, and the grinding force of a single abrasive grain extends to the end surface; in the process simulation model, considering the influence of the change of radial linear velocity on the grinding force, the final grinding force is obtained by partitioning and summing. The experimental comparison shows that the grinding force model has high prediction accuracy in the end grinding with the fine-grained grinding wheel.