刀具幾何參數(shù)對金屬鈦納米切削影響的分子動力學(xué)研究(英文)
發(fā)布時間:2018-11-16 10:36
【摘要】:基于分子動力學(xué)的基本原理,構(gòu)建了鈦的納米切削分子動力學(xué)仿真模型。工件原子間采用嵌入原子勢EAM(Embedded atom method),工件原子與刀具原子間采用Morse勢函數(shù),研究了在不同刃口半徑和刀具前角條件下,鈦納米切削過程中工件形態(tài)、系統(tǒng)勢能、切削力以及工件溫度等的變化規(guī)律。結(jié)果表明:隨著刀具刃口半徑增大,加工表面粗糙度增加,切削力和工件溫度降低,切屑變薄;當(dāng)?shù)毒咔敖怯韶撝翟黾拥秸?鈦工件承受的壓應(yīng)力逐漸變?yōu)榧魬?yīng)力,正前角刀具更有利于切削,同時在不同的刀具前角下,切向力和法向力的大小也有顯著變化。
[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.
【作者單位】: 沈陽航空航天大學(xué)機電工程學(xué)院;
【基金】:supported by Science Foundation of AVIC I,Project(No.2007ZE54011)
【分類號】: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.
【作者單位】: 沈陽航空航天大學(xué)機電工程學(xué)院;
【基金】:supported by Science Foundation of AVIC I,Project(No.2007ZE54011)
【分類號】:TG501.1
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