刀具几何参数对金属钛纳米切削影响的分子动力学研究（英文）
发布时间：2018-11-16 10:36
【摘要】：基于分子动力学的基本原理,构建了钛的纳米切削分子动力学仿真模型。工件原子间采用嵌入原子势EAM(Embedded atom method),工件原子与刀具原子间采用Morse势函数,研究了在不同刃口半径和刀具前角条件下,钛纳米切削过程中工件形态、系统势能、切削力以及工件温度等的变化规律。结果表明:随着刀具刃口半径增大,加工表面粗糙度增加,切削力和工件温度降低,切屑变薄;当刀具前角由负值增加到正值,钛工件承受的压应力逐渐变为剪应力,正前角刀具更有利于切削,同时在不同的刀具前角下,切向力和法向力的大小也有显著变化。
[Abstract]:Based on the basic principle of molecular dynamics, the molecular dynamics simulation model of nano-cutting titanium was constructed. The embedded atomic potential (EAM (Embedded atom method),) is used between the workpiece atoms and the tool atoms. The Morse potential function is used to study the workpiece morphology and system potential energy in the process of titanium nano-cutting under the conditions of different cutting edge radius and cutting tool front angle. The change of cutting force and workpiece temperature. The results show that with the increase of the cutting edge radius, the surface roughness increases, the cutting force and workpiece temperature decrease, and the chip becomes thinner. When the tool front angle is increased from negative value to positive value, the compressive stress of titanium workpiece gradually changes to shear stress, and the positive front angle tool is more favorable for cutting. At the same time, the magnitude of tangential force and normal force also change significantly under different cutting tool front angles.
【作者单位】： 沈阳航空航天大学机电工程学院;
【基金】：supported by Science Foundation of AVIC I,Project(No.2007ZE54011)
【分类号】：TG501.1
[Abstract]:Based on the basic principle of molecular dynamics, the molecular dynamics simulation model of nano-cutting titanium was constructed. The embedded atomic potential (EAM (Embedded atom method),) is used between the workpiece atoms and the tool atoms. The Morse potential function is used to study the workpiece morphology and system potential energy in the process of titanium nano-cutting under the conditions of different cutting edge radius and cutting tool front angle. The change of cutting force and workpiece temperature. The results show that with the increase of the cutting edge radius, the surface roughness increases, the cutting force and workpiece temperature decrease, and the chip becomes thinner. When the tool front angle is increased from negative value to positive value, the compressive stress of titanium workpiece gradually changes to shear stress, and the positive front angle tool is more favorable for cutting. At the same time, the magnitude of tangential force and normal force also change significantly under different cutting tool front angles.
【作者单位】： 沈阳航空航天大学机电工程学院;
【基金】：supported by Science Foundation of AVIC I,Project(No.2007ZE54011)
【分类号】：TG501.1
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