本文選題：有限元仿真　切入點(diǎn)：微細(xì)鉆孔　出處：《山東理工大學(xué)》2017年碩士論文

【摘要】：近年來,隨著科學(xué)技術(shù)的不斷進(jìn)步與發(fā)展,在航空航天、國防、電子工業(yè)等領(lǐng)域,精密小孔的應(yīng)用越來越廣泛,特別是針對某些精密機(jī)械零部件的場合。對精密小孔的加工制造質(zhì)量要求方面,已經(jīng)引起了人們非常大的重視。目前,微細(xì)切削加工技術(shù)仍然是微細(xì)加工制造領(lǐng)域的主要加工方法,這與其經(jīng)濟(jì)性好、效率高和耗能少等特點(diǎn)是密不可分的,并且微細(xì)切削加工可以實(shí)現(xiàn)幾十微米到毫米尺寸的復(fù)雜三維結(jié)構(gòu)、曲面特征的小型零件與裝置的加工。因此對于精密小孔的機(jī)械應(yīng)用,也可以利用微細(xì)切削加工的這種方法來進(jìn)行加工與制造。本文針對精密小孔的微細(xì)切削加工,通過微細(xì)鉆孔與微細(xì)螺旋銑孔兩種不同的加工方式,分別對其進(jìn)行建模仿真并進(jìn)行切削試驗(yàn),研究兩種不同的加工工藝方式下達(dá)到最小未變形切屑厚度時的臨界切削參數(shù)。對小孔微細(xì)切削中切屑的形成、切削力、毛刺進(jìn)行分析,得到微細(xì)切削小孔時較優(yōu)的加工方式與切削參數(shù)。首先,對微細(xì)鉆孔與微細(xì)螺旋銑孔兩種加工方式分別進(jìn)行有限元建模及仿真。根據(jù)微細(xì)切削小孔的要求,對微細(xì)鉆孔與微細(xì)螺旋銑孔兩種加工方式的切削參數(shù)、切屑形貌、切削特征進(jìn)行初步的分析研究。建立合理的微細(xì)切削刀具與工件的有限元配合模型,對微細(xì)鉆孔與微細(xì)螺旋銑孔中的切削參數(shù)進(jìn)行不同的取值,運(yùn)用Deform-3D有限元仿真軟件分別對其進(jìn)行仿真。從切屑的形成與切削力方面對仿真進(jìn)行了分析研究,找到仿真中達(dá)到最小未變形切屑厚度時的臨界切削參數(shù)。其次,對微細(xì)鉆孔與微細(xì)螺旋銑孔兩種加工方式分別進(jìn)行微細(xì)切削試驗(yàn)�；谏鲜龇抡嫜芯�,分別選取合理的切削參數(shù)、加工設(shè)備與刀具,并進(jìn)行小孔的微細(xì)切削試驗(yàn)。確定兩種加工工藝方式下,達(dá)到最小未變形切屑厚度時的臨界切削參數(shù),進(jìn)而驗(yàn)證了上述仿真研究的可靠性與合理性。通過兩種加工方式的對比研究,得到微細(xì)切削小孔時較優(yōu)的加工方式�；谏鲜龇抡媾c試驗(yàn)研究,最后進(jìn)行微細(xì)切削小孔優(yōu)化試驗(yàn)。通過利用多因素正交試驗(yàn)法,分別對不同的微細(xì)切削參數(shù)進(jìn)行合理取值并組合,對研究材料進(jìn)行多次小孔的微細(xì)切削試驗(yàn)。通過對試驗(yàn)結(jié)果分析,包括切削力、制孔毛刺寬度,從而得到優(yōu)化后的切削參數(shù)組合。通過對微細(xì)切削試驗(yàn)總結(jié),為后續(xù)精密小孔的微細(xì)切削加工提供了一定的參考依據(jù)與研究基礎(chǔ)。
[Abstract]:In recent years, with the continuous progress and development of science and technology, in aerospace, national defense, electronic industry and other fields, the application of precision holes is becoming more and more extensive, especially for some precision mechanical parts.The quality requirements of machining and manufacturing of precision holes have attracted great attention.At present, micro-machining technology is still the main processing method in the field of micro-machining manufacturing, which is inseparable from its characteristics of good economy, high efficiency and less energy consumption.And micro machining can realize the machining of small parts and devices with complex three-dimensional structure and surface features of tens of microns to millimeters.Therefore, for the mechanical application of precision holes, we can also use the method of micro-cutting to process and manufacture.In this paper, according to the micro machining of the precision hole, through the two different machining methods of micro hole drilling and micro spiral milling hole, the modeling, simulation and cutting test are carried out respectively.The critical cutting parameters of two different machining processes are studied when the minimum thickness of undeformed chip is obtained.The chip formation, cutting force and burr in micromachining are analyzed, and the optimum machining methods and cutting parameters are obtained.Firstly, the finite element modeling and simulation of micro-drilling and micro-spiral milling are carried out.According to the requirement of micromachining, the cutting parameters, chip morphology and cutting characteristics of two machining methods, micro-drilling and micro-spiral milling, are analyzed and studied preliminarily.A reasonable finite element model of micro cutting tool and workpiece is established, and the cutting parameters in micro drilling and micro spiral milling hole are obtained by different values, and simulated by Deform-3D finite element simulation software.The critical cutting parameters when the minimum thickness of undeformed chip is reached in the simulation are analyzed and studied in terms of chip formation and cutting force.Secondly, two kinds of machining methods, micro-drilling and micro-spiral milling, are tested respectively.Based on the above simulation research, reasonable cutting parameters, machining equipment and cutting tools were selected, and micro cutting experiments of small holes were carried out.The critical cutting parameters are determined when the minimum thickness of undeformed chip is reached under two machining processes, and the reliability and reasonableness of the simulation are verified.Through the comparative study of two kinds of machining methods, the better machining method of micro-cutting holes is obtained.Based on the above simulation and experimental research, the optimization test of micro-cutting holes is carried out.By using the method of multi-factor orthogonal test, the different parameters of micro-cutting were selected and combined reasonably, and the micro-cutting experiments of many small holes were carried out on the materials studied.By analyzing the experimental results, including cutting force and burr width, the optimized cutting parameters are obtained.Through the summary of micro cutting experiments, it provides a certain reference basis and research basis for the follow-up micro machining of small holes.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG506

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