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采用准连续介质力学方法模拟了镍单晶体刀具在单晶铜工件上的切削过程,深入分析了切削过程中的能量演化、应力场变化和原子位移情况等因素.结合切削过程中位错滑移等塑性行为和原子径向分布理论,揭示了切屑产生的机理,证实了切削过程中已加工表面和体相晶体结构的非晶态变化是切屑产生的主要原因.通过对纳米切削过程不同阶段的模拟表明:刀具的耕犁作用下剪切带的形成和扩展是切屑形成的初始阶段;变质层的产生是纳米切削的中间阶段并构成了加工表面组织;储存在变形晶格中的变形能超过一定值时,晶格被打破,形成非晶态结构是切屑形成的最终阶段.
The cutting process of nickel single crystal tool on single crystal copper workpiece was simulated by quasi-continuous medium mechanics method, and the factors of energy evolution, stress field changes and atomic displacement in cutting process were deeply analyzed. Plastic behavior and atomic radial distribution theory revealed the mechanism of chip generation and confirmed that the amorphous state of the machined surface and bulk crystal structure during the cutting process is the main reason for chip generation.Through the simulation of different stages of the nano-cutting process The results show that the formation and extension of the shear zone under the action of the tool’s plow is the initial stage of chip formation. The formation of the metamorphic layer is the intermediate stage of nano-cutting and constitutes the processing surface structure. The deformation energy stored in the deformed lattice exceeds a certain level The value is, the lattice is broken, the formation of amorphous structure is the final stage of chip formation.