Model Establishment And Experimental Study Of Surface/Subsurface Damage In Engineering Ceramic Grinding

The grinding using diamond wheels are the most important method for the machining of engineering ceramic because of its high hardness and brittleness. But in a grinding process, ceramics generate an intense grinding force and are prone to engender surface / subsurface damage. The domestic and overseas research development of the surface / subsurface damage in ceramic grinding was reviewed, analyzed and discussed, and the theory and experiment of the surface / subsurface damage in ceramic grinding have been studied in this paper.Surface / subsurface damage engendered by grinding can reduce the intensity of the work piece and influence surface quality, so in order to control the generation and expansion of surface / subsurface damage, it is necessary to set up a forecasting model based on the material properties and grinding parameters. Defining the surface fragmentation damage rate of material as the damage index of the surface fragmentation damage and the depth of surface / subsurface crack damage as the damage index of the surface / subsurface crack damage, using Si3N4, Al2O3 and ZrO2 for one-way trip grinding experiments, surface fragmentation damage observation experiments and lapping inclined section experiments, the model which can reveal the relationship between the surface fragmentation damage and grinding parameters and the model which can reveal the relationship between the surface / subsurface crack damage and grinding parameters were set up in this paper. Furthermore, the effects of grinding parameters on the surface fragmentation damage and surface / subsurface crack damage were analyzed. Ceramic grinding parameters include grinding depth, work piece material properties, wheel parameters and so on. Through the use of these models, according to the input of the grinding parameters we can predict and control the surface / subsurface crack damage depth and surface fragmentation damage and propose the efficient and economic ceramic grinding parameters, which can optimize the ceramic grinding process, for example, increase the productivity, lower the processing costs and reduce the processing damage.Besides, the finite element method was carried out on three kinds of ceramics material under different grinding condition and the strain condition under different working condition was gained. Thereby, we can forecast the size, distribution and effect depth range of the damage. Finite element method analyses result was similar to the experiment result within the error range, so it was supposed that the principle, process and result of this experiment were feasible and it fitted the finite element method analyses result basically.