A new method (improved ORC method) of constructing irregular particle shape was proposed based on traditional discrete element method and ORC method. Discrete element model of silicon nitride was modeled and cutting simulations was conducted by using above three methods. The relationships among the three methods were discussed from surface quality, distribution state of chips, values of the main cutting force. The advancements of improved ORC method were analyzed. A series of bending and cutting simulations of grain-refining granite and coarse-grained granite were carried out and verified under different parameters, and the values of the bending strength and the horizontal cutting force were calculated. The experimental and simulation results show that the traditional discrete element method is suitable for the modeling of homogeneous and discontinuous materials, the traditional element method and improved ORC method are suitable for the modeling of fine grain granite, whereas the modeling coarse grain granite has to be finished by the improved ORC and ORC methods.
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