發(fā)布時(shí)間：2019-03-16 19:36

【摘要】：機(jī)床橫梁結(jié)構(gòu)的可靠性很大程度上影響機(jī)床整機(jī)的使用壽命及加工精度。本研究以某大型龍門銑床橫梁為研究對象,通過改變橫梁內(nèi)部筋板結(jié)構(gòu)的布置方式,結(jié)合workbench軟件,運(yùn)用概念建模方法,建立了米型、W型、O型三種橫梁結(jié)構(gòu),并對它們的結(jié)構(gòu)分別進(jìn)行了優(yōu)化及可靠性分析。本研究首先介紹了課題研究的背景及意義,闡述了如何對橫梁結(jié)構(gòu)進(jìn)行優(yōu)化進(jìn)而提高橫梁結(jié)構(gòu)的可靠性,從而達(dá)到提高機(jī)床整體可靠性的目的。并簡單介紹了可靠性理論的發(fā)展歷史及國內(nèi)外可靠性研究的發(fā)展?fàn)顩r。另外本研究分別對三種橫梁結(jié)構(gòu)進(jìn)行了靜力學(xué)分析,并運(yùn)用響應(yīng)面法對橫梁結(jié)構(gòu)進(jìn)行了多目標(biāo)優(yōu)化。論文通過靜力學(xué)結(jié)果結(jié)合響應(yīng)面靈敏度分析方法篩選出對橫梁結(jié)構(gòu)剛度及強(qiáng)度影響較大的參數(shù),并以所選參數(shù)作為優(yōu)化的主要輸入變量,橫梁剛度和強(qiáng)度為輸出變量進(jìn)行橫梁結(jié)構(gòu)的優(yōu)化。對優(yōu)化后橫梁結(jié)構(gòu)進(jìn)行重建及靜力學(xué)計(jì)算,進(jìn)行分析可知:響應(yīng)面優(yōu)化能夠極大的提高橫梁結(jié)構(gòu)強(qiáng)度和剛度。本研究最后分別對橫梁結(jié)構(gòu)進(jìn)行了可靠性分析,并詳細(xì)介紹six-sigma可靠性分析的步驟,為其它結(jié)構(gòu)的可靠性分析提供參考。可靠性分析結(jié)果顯示:在同等工況條件下,米型梁結(jié)構(gòu)相較于W型、O型梁結(jié)構(gòu)具有更高的可靠性。為提高橫梁結(jié)構(gòu)的可靠性進(jìn)而提高機(jī)床的制造精度和可靠性提供重要參考。
[Abstract]:The reliability of machine tool beam structure affects the service life and machining precision of machine tool to a great extent. In this study, the cross-beam of a large-scale gantry milling machine is taken as the research object. By changing the arrangement of the internal stiffened plate structure of the cross-beam, combining with the workbench software and using the concept modeling method, three kinds of cross-beam structures, I. E., W-type and O-type, are established. Their structures are optimized and their reliability is analyzed. Firstly, this paper introduces the background and significance of the research, and expounds how to optimize the cross-beam structure to improve the reliability of the cross-beam structure, so as to improve the overall reliability of the machine tool. The development history of reliability theory and the development status of reliability research at home and abroad are also briefly introduced. In addition, the static analysis of three cross-beam structures is carried out, and the multi-objective optimization of the cross-beam structures is carried out by using the response surface method. In this paper, the static results and response surface sensitivity analysis method are used to select the parameters which have great influence on the stiffness and strength of cross-beam structure, and the selected parameters are taken as the main input variables of optimization. The stiffness and strength of the beam are the output variables to optimize the cross-beam structure. The reconstruction and static calculation of the optimized beam structure are carried out. The results show that the response surface optimization can greatly improve the strength and stiffness of the beam structure. At the end of this study, the reliability analysis of cross-beam structure is carried out, and the steps of six-sigma reliability analysis are introduced in detail, which can provide reference for the reliability analysis of other structures. The reliability analysis results show that the o-shaped beam structure has higher reliability than the W-shaped beam structure under the same operating conditions. It provides an important reference for improving the reliability of beam structure and improving the manufacturing precision and reliability of machine tools.
【學(xué)位授予單位】：陜西理工學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG502.3

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