Molecular Dynamics Simulation of Metal Cutting with Local Hydrostatic Pressure Field Formation
Molecular Dynamics Simulation of Metal Cutting with Local Hydrostatic Pressure Field Formation
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DOI：
10.4028/www.scientific.net/kem.523-524.167
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Keito Uezaki;J. Shimizu;Li Bo Zhou;T. Onuki;Hirotaka Ojima
中科院分区：
文献类型：
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作者：
Keito Uezaki;J. Shimizu;Li Bo Zhou;T. Onuki;Hirotaka Ojima
提高已加工表面完整性是精密加工的重要问题之一。本研究的目的是开发一种切削刀具，它能够在切削点附近产生局部静水压力场，以抑制工件中的额外塑性流动，因为众所周知，包括金属在内的材料无论给予多大的静水压力场，都不会引起塑性流动和断裂。在本文中，一个简单的切削工具与平面夹具的建议和分子动力学模拟切削作为第一步。结果表明，采用该模型，由于抑制了额外的侧向塑性流动，切削点附近形成了较高的静水应力场，从而显著地减少了塑性变形，主要是毛刺的形成。然而，还观察到，在切割凹槽下方产生相对多的位错。
Improving machined surface integrity is one of the important issues in the precision machining. This study aims to develop a cutting tool, which enables to generate a local hydrostatic pressure field in the vicinity of the cutting point to suppress the extra plastic flow in the workpiece, because it is known that materials including metals never cause plastic flow and fracture no matter how much greater hydrostatic pressure field is given. In this paper, a simple cutting tool with planer jig is proposed and a molecular dynamics simulation of cutting is performed as the first step. As a result, it is confirmed that the reduction of the plastic deformation, mainly in the burr formation become remarkable with the proposed model due to the suppression of extra side plastic flow, and relatively high-hydrostatic stress field is formed in the vicinity of cutting point. However, it is also observed that relatively many dislocations are generated beneath the cutting groove.