Modeling And Simulation Of Grinding Force Of Silicon Nitride Ceramics Based On Fine Grinding Wheel End Fece Grinding

In order to meet the manufacturing power plan proposed by China's 2025 for high-end manufacturing,related product achievements in research and development,product chain node control,and industrial innovation in their high-end fields in aerospace,national defense security,rail transportation,energy equipment and other fields began to strengthen.The performance requirements of basic materials and basic components continue to increase.As a typical engineering ceramic,silicon nitride ceramics have excellent physical and chemical properties and are widely used in the above fields.However,the excellent material characteristics have also caused the difficulty of the manufacturing process to increase.The coexistence of extremely high hardness and brittleness of the material has caused complex mechanical changes in the grinding process.In this paper,take silicon nitride ceramics with a diamond grinding wheel with a particle size of D46 as the research object.The grinding force prediction accuracy is used as a characterization parameter.The controllability of the process parameters of single particle grinding in the finite element simulation,the randomness of the particle space arrangement of the virtual grinding wheel grinding,and the dynamic interaction between the machine tool processes are used to gradually improve the accuracy of the silicon nitride ceramic end grinding force model.The main achievements of this article are as follows:(1)Establish the theoretical parameters of the process parameters and material characteristics of silicon nitride ceramic end grinding based on the indentation test;establish two types of two-dimensional simplified abrasive particle morphology and gradient grinding depth workpiece simulation finite element model of the simulation grinding process,analyze the influence of abrasive grain morphology and grinding technology on the critical grinding depth of brittle ductile transition,and the change trend of grinding force value before and after brittle ductile transition.(2)Build a three-dimensional finite element grinding force model of fine-grained grinding wheels for grinding silicon nitride ceramics: Establish a randomly cut truncated octahedral abrasive particle model and randomly rotate the abrasive particles for multiple grinding simulations based on the complex shape of the abrasive particles;Based on the abrasive particle volume and the distribution probability of the grinding wheel concentration,the effective abrasive particle number model of the grinding wheel is established;Based on the speed change of the inner and outer rings of the grinding wheel during end grinding,a zone calculation model is established.The design test verifies the grinding force of each process parameter,the result shows that the error is within the allowable range,and the error value has a certain relationship with the process parameter.(3)Considering the influence of machine tool-grinding process interaction on the prediction of grinding force,the finite element model of virtual grinding wheel grinding process was established,the finite element model of machine tool force response was simplified,and the interactive iterative strategy based on empirical parameters was used.Build a coupled interactive platform to assist the rapid modeling and data transmission of the interactive iteration process,which mainly includes model establishment and transfer(Vba-Solid Works-Abaqus),simulation model construction and result data generation(Python-Abaqus),data import and analysis(Txt-Matlab)several modules.The comparison with the test results shows that the machine tool-grinding process interaction strategy and the coupling simulation platform are built can effectively improve the simulation efficiency and grinding force prediction accuracy.