【摘要】：提升國產(chǎn)高檔加工中心及其關(guān)鍵功能部件的可靠性水平,是順應(yīng)數(shù)控設(shè)備高精、高效、高速、柔性和復(fù)合加工發(fā)展趨勢的首要任務(wù)。本文在江蘇省科技支撐計(jì)劃重點(diǎn)項(xiàng)目——"大型五軸高速精密龍門加工中心綠色設(shè)計(jì)技術(shù)與應(yīng)用研究"項(xiàng)目的資助下,以五軸龍門加工中心為研究對(duì)象,通過綜合運(yùn)用可靠性技術(shù)體系,有效評(píng)估新研制的加工中心的可靠性水平。論文主要研究內(nèi)容如下:1、在產(chǎn)品設(shè)計(jì)階段,根據(jù)收集的相似成熟產(chǎn)品的故障數(shù)據(jù)信息,通過FMEA方法對(duì)故障部位、故障模式和故障原因進(jìn)行分析,找到該類產(chǎn)品的薄弱部位并提出相應(yīng)的改進(jìn)措施,提高設(shè)計(jì)產(chǎn)品的可靠性。2、以相似成熟產(chǎn)品服役階段的故障間隔時(shí)間數(shù)據(jù)為基礎(chǔ),采用分布擬合檢驗(yàn)方法建立故障時(shí)間模型,確定該批加工中心的故障數(shù)據(jù)服從威布爾分布,得到可靠度的分布規(guī)律。通過研究各次故障時(shí)間的可靠性分布規(guī)律,建立基于各次故障時(shí)間的可靠性模型,來描述各次故障時(shí)間之間的關(guān)系,實(shí)現(xiàn)對(duì)加工中心可靠性水平的評(píng)估。3、在樣機(jī)試制階段,綜合考慮加工中心的實(shí)際工況,通過正交試驗(yàn)設(shè)計(jì)切削力試驗(yàn),得到相對(duì)全面的載荷譜。以載荷譜的幅值均值為單一協(xié)變量建立WPHM可靠性評(píng)估模型。利用ADAMS軟件結(jié)合試驗(yàn)載荷建立整機(jī)動(dòng)力學(xué)仿真模型,獲得關(guān)鍵零部件滾珠絲杠的載荷譜,進(jìn)而對(duì)其進(jìn)行靜強(qiáng)度可靠性分析和疲勞壽命分析,驗(yàn)證了所選滾珠絲杠符合可靠性要求。4、以灰色理論為基礎(chǔ),建立基于故障間隔時(shí)間的灰色GM(1,1)預(yù)測模型,來實(shí)現(xiàn)對(duì)未來故障發(fā)生時(shí)間的預(yù)測,以便提早做好防護(hù)工作,提高加工中心運(yùn)行過程中的可靠性水平。5、利用Matlab GUI語言根據(jù)可靠性評(píng)價(jià)和分析工作的要求開發(fā)可靠性信息管理系統(tǒng),實(shí)現(xiàn)故障數(shù)據(jù)的管理、統(tǒng)計(jì)分析、可靠性評(píng)價(jià)和預(yù)測等功能。
[Abstract]:To improve the reliability level of domestic high-grade machining center and its key functional components is the primary task to conform to the development trend of CNC equipment with high precision, high efficiency, high speed, flexibility and compound machining. In this paper, we take the five-axis gantry machining center as the research object, funded by the key project of Jiangsu Science and Technology support Program, "Green Design Technology and Application Research of Large-scale Five-axis Precision Gantry Machining Center". The reliability level of the newly developed machining center is evaluated effectively through the comprehensive application of the reliability technology system. The main contents of this paper are as follows: in the stage of product design, according to the fault data of similar mature products, the fault location, fault mode and fault cause are analyzed by FMEA method. The weak parts of this kind of products are found and the corresponding improvement measures are put forward to improve the reliability of the design products. Based on the fault interval time data of similar mature products in service stage, the fault time model is established by using the distributed fitting test method. The fault data distribution of the batch machining center is determined from Weibull distribution, and the distribution rule of reliability is obtained. By studying the reliability distribution law of each failure time, the reliability model based on each failure time is established to describe the relationship between each failure time, and to realize the evaluation of reliability level of machining center. Considering the actual working conditions of machining center, a relatively comprehensive load spectrum is obtained by orthogonal design of cutting force test. The reliability evaluation model of WPHM is established with the amplitude mean of load spectrum as a single covariable. The dynamic simulation model of the whole machine is established by using the ADAMS software combined with the test load, and the load spectrum of the ball screw of the key parts is obtained, and then the static strength reliability analysis and fatigue life analysis of the ball screw are carried out. It is verified that the selected ball screw meets the requirements of reliability. Based on the grey theory, a grey GM (1 / 1) prediction model based on the fault interval time is established to predict the future fault occurrence time, so as to do the protection work well ahead of time. The reliability level of machining center is improved. The reliability information management system is developed by using Matlab GUI language according to the requirements of reliability evaluation and analysis, and the fault data management and statistical analysis are realized. Reliability evaluation and prediction functions.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG659

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