本文選題：三偏心蝶閥 + 數(shù)控加工　； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：蝶閥密封面密封效果不僅與理論設(shè)計(jì)有關(guān),與加工技術(shù)也密不可分。閥體和碟板是三偏心金屬密封蝶閥的關(guān)鍵零件,其結(jié)構(gòu)復(fù)雜,加工難度大,閥體和碟板加工質(zhì)量的優(yōu)劣直接影響到蝶閥的密封性能,而閥體和碟板加工質(zhì)量的優(yōu)劣通過密封面的加工精度來體現(xiàn),其加工精度與數(shù)控加工方案、加工設(shè)備、加工方法以及切削參數(shù)等都有一定的關(guān)系。傳統(tǒng)的蝶閥加工方式和手段已經(jīng)落后,勞動(dòng)者的工作強(qiáng)度和工作環(huán)境都比較差,從而影響零件的生產(chǎn)效率,導(dǎo)致蝶閥加工質(zhì)量難以保證,進(jìn)而影響蝶閥的密封性能。因此,需要探討蝶閥閥體和碟板的數(shù)控加工技術(shù),以便獲得高精度的蝶閥密封面。本文以某企業(yè)生產(chǎn)的DN300垂直板三偏心金屬密封蝶閥為研究對(duì)象,結(jié)合數(shù)控加工工藝的理論知識(shí),對(duì)所采取的加工工藝方案及切削參數(shù)進(jìn)行了加工試驗(yàn),并對(duì)加工后的蝶閥進(jìn)行密封試驗(yàn)。具體的研究內(nèi)容如下:1、分析蝶閥密封面的位置和輪廓,根據(jù)閥體和碟板的結(jié)構(gòu)特點(diǎn)和密封性能要求,建立閥體和碟板密封面加工精度與蝶閥密封性能的關(guān)聯(lián)模型。2、介紹了影響蝶閥密封性能的關(guān)鍵因素,然后建立蝶閥關(guān)鍵尺寸加工誤差溯源的數(shù)學(xué)模型,對(duì)蝶閥實(shí)際加工制造質(zhì)量進(jìn)行分析,闡明了關(guān)鍵尺寸加工偏差對(duì)蝶閥加工質(zhì)量及密封性能的影響。3、根據(jù)閥體和碟板的零件特點(diǎn),制定出合理的蝶閥閥體和碟板的加工工藝方案;對(duì)蝶閥密封面關(guān)鍵尺寸的粗、精加工進(jìn)行不同切削工藝參數(shù)組合,采取量化分析的方法,獲得滿足蝶閥密封面加工精度的最佳切削工藝參數(shù)組合。4、運(yùn)用已獲得的密封面加工精度切削參數(shù)組合對(duì)蝶閥進(jìn)行加工,對(duì)閥體和碟板各加工出10組數(shù)據(jù),通過蝶閥液壓試驗(yàn)臺(tái)采取單因素變量法,測(cè)得蝶閥關(guān)鍵尺寸加工偏差與泄漏量的關(guān)系,最終得到了影響蝶閥密封性能關(guān)鍵尺寸偏差的最佳參數(shù)組合。結(jié)果表明:本課題所構(gòu)建的加工精度與密封性能的關(guān)聯(lián)模型、加工誤差溯源的數(shù)學(xué)模型以及獲得的最佳切削工藝參數(shù)組合和關(guān)鍵尺寸偏差組合,在理論上能給蝶閥密封面的設(shè)計(jì)和優(yōu)化提供幫助,按照本課題所提出的加工方案加工出的閥體和碟板,能夠更好的滿足三偏心金屬密封蝶閥的工況要求。
[Abstract]:The sealing effect of butterfly valve sealing surface is not only related to theoretical design, but also to machining technology. The valve body and disc are the key parts of the three-eccentric metal seal butterfly valve. The structure is complex and the processing is difficult. The quality of the valve body and disc directly affects the sealing performance of the butterfly valve. The machining quality of valve body and disc is reflected by the machining precision of sealing surface. The machining precision is related to NC machining scheme, machining equipment, machining method and cutting parameters. The traditional butterfly valve processing methods and means have fallen behind, the workers' working intensity and working environment are poor, thus affecting the production efficiency of the parts, resulting in the butterfly valve processing quality is difficult to ensure, and then affect the sealing performance of the butterfly valve. Therefore, it is necessary to discuss the NC machining technology of butterfly valve body and disc in order to obtain high precision butterfly valve sealing surface. In this paper, taking the DN300 vertical plate three-eccentric metal seal butterfly valve produced by a certain enterprise as the research object, combined with the theoretical knowledge of the NC machining technology, the machining process scheme and cutting parameters are tested. The seal test of the butterfly valve was carried out. The specific research contents are as follows: 1: 1, analyzes the position and outline of butterfly valve sealing surface, according to the structure characteristics of valve body and disc and sealing performance requirements, The correlation model between the machining accuracy of valve body and disc sealing surface and the sealing performance of butterfly valve is established. The key factors affecting the sealing performance of butterfly valve are introduced, and the mathematical model for tracing the machining error of key dimensions of butterfly valve is established. Based on the analysis of the actual manufacturing quality of butterfly valve, the influence of machining deviation of key dimensions on the machining quality and sealing performance of butterfly valve is expounded. According to the characteristics of the parts of valve body and disc, a reasonable processing technology scheme of butterfly valve body and disc is worked out. In this paper, the key dimensions of the sealing face of butterfly valve are combined with different cutting process parameters, and the quantitative analysis method is adopted. The best cutting process parameter combination. 4 is obtained to satisfy the machining accuracy of butterfly valve sealing surface. The obtained cutting parameters combination of seal face machining precision is used to process butterfly valve, and 10 groups of data are processed for each valve body and disc. By using single factor variable method, the relationship between machining deviation of key dimension and leakage of butterfly valve was measured, and the best parameter combination that affected the key dimension deviation of butterfly valve seal performance was obtained. The results show that the correlation model of machining accuracy and sealing performance, the mathematical model of machining error traceability, and the combination of optimum cutting process parameters and key dimension deviations are obtained in this paper. In theory, it can provide help for the design and optimization of butterfly valve sealing surface. The valve body and disc manufactured according to the processing scheme proposed in this paper can better meet the requirements of the three-eccentric metal seal butterfly valve.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH134;TG659

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