Grinding Force Model Study On Micro End Grinding Of Hard And Brittle Materials Based On Micro End Grinding

With the development of science and technology, miniaturization parts have been applied extensively in the fields of aerospace, defense, machinery etc. The hard and brittle materials, such as engineering ceramic and glass, have good mechanical properties and physical properties which are high hardness, high strength, the good abrasion resistance and so on. They can be used in reliably and persistently in high pressure, high speed and overloaded environment, especially in high-profile industries. Hard and brittle materials with their special characteristics and components of miniaturization are difficultly processed and then limited to popularization and application. The existing micro machining methods for micro parts with complicated surface have many disadvantages, so far. In order to make it more suitable for practical productions, this paper adopts the end micro grinding machining method to solve some problems existing in the micro grinding.Grinding forces are important characteristic parameters of micro grinding mechanism research, this article mainly aims at grinding forces of micro end grinding of hard and brittle materials. Due to the cutting depth of micro end grinding is fixed, the undeformed chip thickness is an important parameter connecting the grinding parameters and grinding results. Based on the existing research on micro grinding mechanism, the analysis of the single diamond grits is very important on account of the micro grinding depth and the ratio of particle radius is far less than 1. This article from the Angle of the single diamond grits material removal is studied. Firstly, the phases of different grinding ways in the micro grinding process are analyzed, and the critical locations of the deformation model of the chip thickness are set up through studying the mechanism of brittle-ductile transition.Secondly, the paper establishes the models of the instantaneous cutting thickness, not deformation model of chip thickness, single diamond grinding force, and the whole workpiece force model combined with the static distribution of the grinding wheel on grinding grain. At last, simulation of single diamond grits along with the change of process parameters and machining surface quality along with the change of grinding force and machining parameters are studied.To verify the above analysis through experiments, this study set up an experimental platform for the micro end face grinding, and did the micro end grinding experiments inallusion to the optical glass(non-crystal materials) and engineering ceramics(crystal materials). Through the experiment data, parameter values of the theoretical model can be determined, and the grinding force model can be amended and perfected. Then, the changing law of the grinding force and force ratio can be got through experiments with different processing parameters. At the same time, the experimental data verifies the theoretical model of grinding force. By observing the the finished surface obtained by scanning electron microscope(SEM), the theoretical results are verified. Based on the above analysis, the optimal processing parameters of different materials are determined considering the influence of grinding force in grinding process.