完全烧结牙科氧化锆陶瓷的磨削仿真

摘要

The simulation of grinding process for ZrO 2 was studied in.A simulating method called Discrete Element Method (DEM) for the simulation was presented.Discrete element model of fully sintering dental ZrO 2 was constructed and its microscop-ic parameters were calibrated based on uniaxial compressing ,three-point bending ,single edge beam specimen technique and Bra-zilian tests.Based on the discrete element model ,the dynamic process of ZrO 2 grinding was simulated ,and the effects of different rotating speeds ,radial depths ,axial depths and federates on crack number ,crack depth ,radial force and axial force were also ana-lyzed.Results show that the main method of improving grinding efficiency is to increase rotating speed and federate for ensuring grinding quality.At the same time,increasing rotating speed can decrease grinding force and ensure stability of grinding process .%研究氧化锆陶瓷的磨削仿真问题，提出采用离散元法对氧化锆陶瓷进行磨削仿真。通过单轴压缩、三点弯曲、单边切口梁和巴西圆盘拉伸等数字模拟试验，以实测得出的宏观力学参数对离散元模型细观参数进行标定，建立了氧化锆陶瓷的离散元仿真模型。基于该模型对氧化锆陶瓷磨削加工过程进行了动态仿真，分析了不同的磨头转速、径向切深、轴向切深和进给速度等加工参数对裂纹数目、裂纹深度、径向磨削力和切向磨削力的影响。仿真结果表明：在保证陶瓷加工质量的前提下，提高磨削效率的主要途径是提高磨头转速和进给速度；提高磨头转速可以降低磨削力，有助于保证磨削过程的稳定性。