• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (17): 94-104.doi: 10.3901/JME.2016.17.094

• 精密加工制造技术专栏 • 上一篇    下一篇

颗粒微切削表面创成的分子动力学仿真研究*

李俊烨1,2, 董坤1, 王兴华1, 张心明1   

  1. 1. 长春理工大学机电工程学院 长春 130022;
    2. 吉林大学机械科学与工程学院 长春 130000
  • 出版日期:2016-09-05 发布日期:2016-09-05
  • 作者简介:李俊烨,男,1981年出生,博士,副教授。主要研究方向为精密加工、流体和微切削理论。

    E-mail: ljy@cust.edu.cn

    张心明(通信作者),男,1967年出生,博士,研究员,博士研究生导师。主要研究方向为精密与超精密加工、检测及装备。

    E-mail:zxm@cust.edu.cn

  • 基金资助:
    * 国家自然科学基金(51206011)、吉林省科技发展计划 (20130522186JH, 20160101270JC)和吉林省教育厅项目(吉教科合字[2016]第386号)资助项目; 20150908收到初稿,20160506收到修改稿;

Molecular Dynamics Simulation Research into Generative Mechanism of Particles Micro-cutting Surface

LI Junye1,2, DONG Kun1, WANG Xinghua1, ZHANG Xinming1   

  1. 1. College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun 130022;
    2. College of Mechanical Science and Engineering, Jilin University, Changchun 130000
  • Online:2016-09-05 Published:2016-09-05

摘要:

颗粒微切削的性能和行为直接影响工件的表面质量,从材料去除规律和能量变化规律的角度对颗粒微切削作用的表面创成机理进行研究,分别采用EAM势、Morse势、Tersoff势描述单晶铜原子间、工件与颗粒、颗粒刀具原子间的作用力。分析纳米尺度下颗粒切削方向、颗粒切削速度、系综温度对颗粒微切削作用,通过探讨体系动能、体系势能、体系总能对工件原子运动规律的影响及颗粒微切削加工前后键角的变化形态,为阐述颗粒微切削作用的表面创成机理提供理论依据。研究结果表明正交切削比斜切削能获得更好的表面质量,颗粒速度与能量不存在线性关系,颗粒温度对体系能量有直接影响。通过分子动力学数值模拟得到体系的结构信息及相关热力学性质并对分子动力学的微观统计量进行分析计算,寻找合适的加工参数,为颗粒微切削加工工艺的发展提供技术支持。

关键词: 表面质量, 创成机理, 分子动力学, 微切削, 单晶颗粒

Abstract:

The performance of monocrystalline particles micro cutting has direct influence on surface finish quality. So the study angle is regularity of material removal and energy change in surface formation mechanism of monocrystalline particles micro cutting. A three dimensional model of molecular dynamics is employed to study the monocrystalline copper micro cutting mechanism. The model include the utilization of the EAM potential function, Morse potential function, and tersoff potential function to simulate the interatomic force between copper atoms, the workpiece and copper particles. The effect of particles cutting direction and velocity and ensemble temperature on particles micro cutting in nano scale with the model are analyzed. Through discussing the effect of system kinetic energy and potential energy and total energy on workpiece-atomic movement rule, and the change of bond angle with particles micro cutting, it provides theoretical basis for surface formation mechanism of monocrystalline particles micro cutting. The results show that the surface finish is better in orthogonal cutting than that in bevel cutting, linear relationship of particles velocity and energy don’t exist and particles temperature have direct influences on system energy. Molecular dynamics simulation is carried out to get system structural information and thermodynamic property and provides a method to search appropriate machining parameter. Through the simulation, the technical support for the study on particles micro cutting processing technology is provided.

Key words: generative mechanism, micro cutting, molecular dynamics, surface quality, monocrystalline particles