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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。
Based on the basic principles of molecular dynamics, a nano-cutting molecular dynamics simulation model of titanium was constructed. The embedded atoms method (EAM) was adopted between the workpieces and the Morse potential function between the workpieces and the tool atoms. The effects of different cutting edge radii and tool rake angles on the workpiece morphology, system potential, Cutting force and workpiece temperature changes. The results show that as the cutting edge radius increases, the machined surface roughness increases, the cutting force and workpiece temperature decrease and the chip becomes thinner. When the rake angle increases from negative to positive, the compressive stress on the titanium workpiece gradually becomes Shear stress, positive angle tool is more conducive to cutting, at the same time in different rake angle, tangential force and normal force size also have significant changes.