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针对砂轮表面上磨粒形状不规则、尺寸不确定的几何特征,研究了模拟实际磨粒的几何建模方法。采用随机空间平面切分正六面体的方法构建了具有实际磨粒几何特征的不规则多面体结构磨粒。基于LS-DYNA软件,采用流固耦合有限元法模拟了不规则多面体结构磨粒的切削过程。分析切削过程中工件材料的应力分布规律与切削变形规律,得出结论:工件材料的加工应力主要集中在与磨粒切削刃及棱角接触的区域;切屑沿磨粒挤压前面向上流动,并于挤压面法向方向上流出;磨粒挤压前角的增大有利于切屑的形成。利用陶瓷立方氮化硼(CBN)砂块进行了磨粒划擦试验,试验结果证实了磨粒切削仿真结果的准确性。
Aiming at the geometric characteristics of irregular shape and indeterminate size of abrasive grains on grinding wheel surface, the geometrical modeling method to simulate actual abrasive grains was studied. An irregular polyhedral structure abrasive grain with the geometric features of the actual abrasive grains was constructed by stitching the regular hexahedron with a random space plane. Based on the LS-DYNA software, the fluid-solid coupling finite element method was used to simulate the cutting process of irregular polyhedron abrasive grains. The stress distribution law and cutting deformation law of workpiece material during the cutting process are analyzed. The conclusion is drawn that the working stress of the workpiece material mainly concentrates in the area of contact with abrasive cutting edge and edge; Extrusion surface normal direction of the outflow; abrasive particles increase the front angle is conducive to the formation of chips. Abrasive grain abrasion test was carried out by using ceramic cubic boron nitride (CBN) sandblast. The test results confirmed the accuracy of the abrasive cutting simulation results.