本文選題：分子動力學　切入點：金屬鋁　出處：《沈陽航空航天大學》2017年碩士論文　論文類型：學位論文

【摘要】：伴隨著航空航天、醫(yī)療器械及電子通訊等行業(yè)的迅速發(fā)展,對各種高精度零部件、高精度曲面及微小構(gòu)件的加工精度要求也越來越高,部分精度要求已經(jīng)達到納米級別。然而,納米級的加工機理和規(guī)律與常規(guī)條件下的加工有著本質(zhì)的區(qū)別,所以,再應用宏觀的切削理論來研究納米級切削機理及規(guī)律顯然是不合適的。本文應用分子動力學(Molecular dynamics,MD)的理論及方法,建立了金屬鋁的納米切削分子動力學仿真(Molecular dynamics simulation,MDS)模型,對其進行納米切削仿真,從微觀角度來探究其納米切削過程。首先,本文對納米切削MDS的發(fā)展及研究現(xiàn)狀進行了詳細介紹,在認真學習和研究了MD的基本理論及方法后,確定了適用于金屬鋁的納米切削MDS的方法及相關(guān)切削仿真參數(shù)、仿真條件,建立了其納米切削MDS模型,并開發(fā)出相應的仿真程序。其次,對所建立的金屬鋁納米切削MDS模型進行了弛豫研究,得到了弛豫時的系統(tǒng)勢能變化曲線并給出了弛豫時間。對模型進行了納米切削仿真,得到切削時的瞬時原子圖像、切削力、切削溫度等,并對切削過程中材料的去除、已加工表面的形成及切削力、切削溫度、系統(tǒng)勢能的變化規(guī)律進行了詳細分析。再次,研究了在相同的仿真條件下,不同仿真參數(shù)的變化對金屬鋁納米切削過程的影響。最后,研究了在相同的仿真條件下,刀具在不同位置的磨損情況下對金屬鋁納米切削過程的影響,包括切削過程中的切削力、刀具溫度、工件溫度的變化規(guī)律等。
[Abstract]:With the rapid development of aerospace, medical devices and electronic communication industries, the machining accuracy requirements of various high-precision parts, high-precision curved surfaces and micro-components are becoming more and more high, some of which have reached the nanometer level. The mechanism and law of nanoscale processing are essentially different from those of conventional processing, so, It is obvious that it is inappropriate to apply the macroscopic cutting theory to study the mechanism and law of nanoscale cutting. In this paper, the molecular dynamics simulation model of nano-machined aluminum is established by using the theory and method of molecular dynamics molecular dynamics (MD). Nano-cutting simulation is carried out to explore the nanoscale cutting process from the micro point of view. Firstly, the development and research status of nano-cutting MDS are introduced in detail. After studying and studying the basic theory and method of MD, The method of nano-cutting MDS suitable for metal aluminum and the relevant cutting simulation parameters and simulation conditions are determined. The MDS model of nano-cutting is established and the corresponding simulation program is developed. In this paper, the relaxation of the MDS model for nanometallic aluminum cutting is studied, the curve of the system potential energy and the relaxation time are obtained. The simulation of the model is carried out, and the instantaneous atomic image and cutting force are obtained. The material removal, the formation of the machined surface, the cutting force, the cutting temperature and the system potential energy are analyzed in detail. Thirdly, under the same simulation conditions, the change of the material, the formation of the machined surface, the cutting temperature and the potential energy of the system are analyzed in detail. The influence of different simulation parameters on the process of metal aluminum nano-cutting is studied. Finally, the influence of tool wear on the process of metal aluminum nano-cutting under the same simulation conditions is studied. Including cutting force, tool temperature, workpiece temperature, etc.
【學位授予單位】：沈陽航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG501

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