Molecular Dynamics Simulation for Grinding Interface Under Minimum Quantity Lubrication

doi:10.7652/xjtuxb202012020

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Molecular Dynamics Simulation for Grinding Interface Under Minimum Quantity Lubrication

更新时间：2025-07-09

- Molecular Dynamics Simulation for Grinding Interface Under Minimum Quantity Lubrication
- Vol. 54, Issue 12, Pages: 168-175(2020)
- 作者机构：
  
  1. 青岛理工大学机械与汽车工程学院,山东,青岛,266525
  2. 青岛理工大学工业流体节能与污染控制教育部重点实验室,山东,青岛,266525
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202012020
  CLC： TG580.1
- Online First：10 December 2020，
  
  Published：2020
- 稿件说明：
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Molecular Dynamics Simulation for Grinding Interface Under Minimum Quantity Lubrication[J]. 2020, 54(12): 168-175.
DOI：

Molecular Dynamics Simulation for Grinding Interface Under Minimum Quantity Lubrication[J]. 2020, 54(12): 168-175. DOI： 10.7652/xjtuxb202012020.

摘要

为了研究微量润滑磨削界面的冷却润滑效应

以离子液体作为微量润滑磨削液

对微量润滑磨削界面进行了分子动力学模拟研究。分析了微量润滑磨削界面的热量分配关系

揭示了磨削界面热量的产生与传散机制

研究了磨削过程中磨削力、磨削力比以及磨粒工件之间液膜状态的变化。结果表明:离子液体雾滴在磨削界面的冷却效果显著

工件的热量分配比由干磨时的74.1%减小到微量润滑磨削时的68%～69%; 磨削热主要来源于剪切变形区内工件材料发生的晶格变形

其次是磨粒与工件之间的摩擦; 磨削热首先在工件基体、磨粒和切屑之间传递

然后经切屑传递给雾滴

雾滴再传递给磨粒; 磨削力随未变形切屑厚度的增加而线性增大; 当磨粒切入工件形成切削作用时

磨粒-工件界面和磨粒-切屑界面会产生极高的挤压应力

导致难以形成边界润滑膜。

Abstract

To research the cooling and lubricating effects on the grinding interface under minimum quantity lubrication

a molecular dynamics simulation of grinding interface under minimum quantity lubrication with ionic liquid is performed. The heat partition relationship on the grinding interface is analyzed

and the generation and transfer mechanisms of grinding heat on the grinding interface are revealed. The variations of grinding force

grinding force ratio

and the liquid film between abrasive grain and workpiece are investigated. The results show that the cooling effect of the ionic liquid droplet is outstanding. The heat partition ratio of the workpiece reaches 74.1% in dry grinding

and under minimum quantity lubrication

the heat partition ratio of the workpiece is reduced to 68% - 69%. Grinding heat is mainly generated from the lattice deformation of the workpiece material in the shear zone

and the secondary heat source is friction between the abrasive grain and the workpiece. The generated heat is firstly transferred into the workpiece substrate

the abrasive grain

and the grinding chip directly

afterwards

a portion of heat in the grinding chip is transferred into the ionic liquid droplet

then a portion of the heat in the ionic liquid droplet is transferred into the abrasive grain. The grinding force linearly increases with the increasing undeformed chip thickness. As the abrasive grain cutting into the workpiece

highly compressive stress appears on the grain-workpiece and grain-chip interfaces

which leads to difficulty in forming a boundary lubricating film.

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Keywords

references

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