牙科氧化锆陶瓷微尺度磨削力研究

Micro-scale Grinding Force of Dental Zirconia Ceramics

基于带有圆弧刃角的圆锥状磨粒形状和突出高度服从瑞利分布的假设,建立单颗磨粒未变形切削厚度数学模型.根据微磨削力的三种不同来源,以单颗磨粒为研究对象,建立磨削过程中单颗磨粒的切削变形力、耕犁力和摩擦力理论模型.结合单位面积内的磨粒数目,建立微磨削力的理论模型.切向磨削力和法向磨削力预测模型的验证结果表明:切向磨削力理论值与实验值平均误差为7.32%,最大误差小于10%;法向磨削力的平均误差为8.18%,最大误差小于20%.

Based on the assumption that the shape of conical abrasive with circular edge angles and the protrusion height follow Rayleigh distribution,a mathematical model of undeformed cutting thickness of a single abrasive was established.According to three different sources of the micro-grinding force,a single abrasive was taken as the research object,and a theoretical model of cutting deformation force,plough force and friction force of single abrasive during the grinding process was established.A theoretical model of micro-grinding force was established by combining the number of abrasive per unit area.The verification results of tangential grinding force and normal grinding force prediction models showed that the average error between theoretical and experimental values of tangential grinding force is 7.32%,and the maximum error is less than 10%.The average error of normal grinding force is 8.18%,and the maximum error is less than 20%.