Zhao Pengyue, Zhang Qi, Guo Yongbo, Liu Huan, Deng Zongquan
School of Mechatronics Engineering, Harbin Institute of Technology, No. 92, Xidazhi Street, Nangang District, Harbin 150001, China.
Qian Xuesen Laboratory of Space Technology, No. 104, Youyi Road, Haidian District, Beijing 100094, China.
Micromachines (Basel). 2020 Mar 4;11(3):265. doi: 10.3390/mi11030265.
Nanoparticle (NP), as a kind of hard-to-machine component in nanofabrication processes, dramatically affects the machined surface quality in nano-cutting. However, the surface/subsurface generation and the plastic deformation mechanisms of the workpiece still remain elusive. Here, the nano-cutting of a single-crystalline copper workpiece with a single spherical embedded nanoparticle is explored using molecular dynamics (MD) simulations. Four kinds of surface/subsurface cases of nanoparticle configuration are revealed, including being removed from the workpiece surface, moving as a part of the cutting tool, being pressed into the workpiece surface, and not interacting with the cutting tool, corresponding to four kinds of relative depth ranges between the center of the nanoparticle and the cutting tool. Significantly different plastic deformation mechanisms and machined surface qualities of the machined workpiece are also observed, suggesting that the machined surface quality could be improved by adjusting the cutting depth, which results in a change of the relative depth. In addition, the nanoparticle also significantly affects the processing forces in nano-cutting, especially when the cutting tool strongly interacts with the nanoparticle edge.
纳米颗粒（NP）作为纳米制造过程中一种难以加工的部件，在纳米切削中对加工表面质量有显著影响。然而，工件的表面/亚表面生成以及塑性变形机制仍然难以捉摸。在此，利用分子动力学（MD）模拟研究了含有单个球形嵌入式纳米颗粒的单晶铜工件的纳米切削过程。揭示了纳米颗粒配置的四种表面/亚表面情况，包括从工件表面去除、作为切削刀具的一部分移动、被压入工件表面以及不与切削刀具相互作用，这对应于纳米颗粒中心与切削刀具之间的四种相对深度范围。还观察到加工工件的塑性变形机制和加工表面质量有显著差异，表明可以通过调整切削深度来改善加工表面质量，这会导致相对深度的变化。此外，纳米颗粒在纳米切削中也会显著影响加工力，特别是当切削刀具与纳米颗粒边缘强烈相互作用时。
