Finite Element Simulation And Experimental Research On The Grinding Of Silicon Carbide Ceramics By Diamond Grinding Wheel

Silicon carbide ceramics has been applied to the petroleum industry,chemical engineering,aerospace field,mechanical manufacture and automotive parts due to their excellent properties such as high temperature resistance,excellent resistance to wear,well chemical stability,good hardness,high thermal conductivity,good thermal stability,which are widely used in many fields such as national defense and many other fields.This thesis takes silicon carbide ceramics as the research object to carry out the research on the dynamic mechanical properties of silicon carbide ceramics during the grinding process.Modeling a single abrasive particle and a portion of the diamond wheel under microscope observation,numerically generate the surface topography of the grinding wheel.At the same time,building a grinding experiment platform,the finite element model of SiC ceramic grinding is validated.The law of damage evolution and expansion during the grinding process is analyzed,so as to study the grinding mechanism of silicon carbide ceramics.Establish a numerical model of the size,shape,and arrangement distribution of abrasive particles based on ultra-depth-of-field microscope observations and statistics.Considering the height of the abrasive grain,the density of the abrasive grain synthetically,build a model of diamond abrasive particles and a block of diamond wheel,which provide a foundation for the simulation of the grinding process in the future.Using the method of controlling a single variable.The finite element model of single grain grinding process and local diamond wheel grinding sic workpiece are built at the same time with the help of JH-2 ceramic constitutive model.Build a simulation analysis model on engineering ceramic sic grinding process from different levels,post-processing can not only output multiphysical fields such as stress and strain that are difficult to measure in engineering practice,the established numerical model is also designed for diamond grinding wheels to predict ceramic grinding.The grinding force,chip removal and scratch morphology provide an efficient method and theoretical basis.Independently set up an experimental platform to carry out grinding experiments and surface damage analysis after grinding,monitor the grinding force in real time.Observing the surface morphology of the workpiece so as to analyze the distribution of scratches on the grinding surface.Compare the grinding force value measured by the surface grinder grinding experiment with the value of the finite element simulation output grinding force,which verified the simulation model has a certain reference significance in the allowable error range,get the pretty combination of process parameters: the grinding depth is 10μm,the feed speed is17.92mm/s and the spindle speed is 1500r/min.The research and simulation of engineering ceramic silicon carbide grinding mechanism in this thesis have certain guiding significance in production practice,which provide some reference for later research.Meanwhile,according to the experimental data and ground surface morphology,analyzing the surface damage and crack evolution modes of silicon carbide ceramics which could improve the surface grinding quality of engineering ceramics in theoretical research and experimental process.