Research on MD simulation for diamond tool cutting iron

ABSTRACT

In this paper, the molecular dynamics simulation method was used to establish the MD model for diamond cutting iron. The cutting process was simulated, and the change rules of temperature, cutting stress and radial distribution function with timestep were analysed. The results show that: As the cutting progresses, the temperature will increase gradually, the cutting stress fluctuates around 50,000 bars, and the wear mechanism of tool is analysed form a microscopic perspective; By adjusting the posture of the tool, the rake angle and the flank angle are changed, and the size of the thermostat layer and boundary layer are adjusted at the same time, which reduces the impact of non-Newton atoms on the workpiece; The change rules of temperature and cutting stress under different rake angle and flank angle conditions are analysed, and the minimum cutting stress is obtained when the rake angle is 15 degrees; By prefabricating a crack on the flank face, the change rule of the crack edge stress is studied. It is found that due to the occurrence of crack, the contact area between the tool and the workpiece is reduced, and there is obvious stress concentration at the edge of the crack.

KEYWORDS:

• Molecular dynamics
• nanometric cutting
• tool posture
• crack
• tool wear

Acknowledgements

We thank the teachers of Harbin engineering university for their help. Conceptualisation, Lan Zhang; Methodology, Lan Zhang; Software, Yongquan Sun; Validation, Ming Liu; Formal analysis, Yongquan Sun; Resources, Gang Wang; Data curation, Yongquan Sun; Writing – original draft preparation, Yongquan Sun; Writing – review and editing, Lan Zhang; Visualisation, Ming Liu; Supervision, Gang Wang; Funding acquisition, Gang Wang. All authors have read and agreed to the published version of the manuscript.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was funded by the National Natural Science Foundation of China [grant number 5167051260]; the State Key Laboratory of Ocean Engineering (Shanghai Jiao Tong University) [grant number 1804].