垂直板三偏心金属密封碟阀的数控加工技术研究

发布时间：2018-06-05 11:26

本文选题：三偏心蝶阀 + 数控加工　；参考：《兰州理工大学》2017年硕士论文

【摘要】：蝶阀密封面密封效果不仅与理论设计有关,与加工技术也密不可分。阀体和碟板是三偏心金属密封蝶阀的关键零件,其结构复杂,加工难度大,阀体和碟板加工质量的优劣直接影响到蝶阀的密封性能,而阀体和碟板加工质量的优劣通过密封面的加工精度来体现,其加工精度与数控加工方案、加工设备、加工方法以及切削参数等都有一定的关系。传统的蝶阀加工方式和手段已经落后,劳动者的工作强度和工作环境都比较差,从而影响零件的生产效率,导致蝶阀加工质量难以保证,进而影响蝶阀的密封性能。因此,需要探讨蝶阀阀体和碟板的数控加工技术,以便获得高精度的蝶阀密封面。本文以某企业生产的DN300垂直板三偏心金属密封蝶阀为研究对象,结合数控加工工艺的理论知识,对所采取的加工工艺方案及切削参数进行了加工试验,并对加工后的蝶阀进行密封试验。具体的研究内容如下:1、分析蝶阀密封面的位置和轮廓,根据阀体和碟板的结构特点和密封性能要求,建立阀体和碟板密封面加工精度与蝶阀密封性能的关联模型。2、介绍了影响蝶阀密封性能的关键因素,然后建立蝶阀关键尺寸加工误差溯源的数学模型,对蝶阀实际加工制造质量进行分析,阐明了关键尺寸加工偏差对蝶阀加工质量及密封性能的影响。3、根据阀体和碟板的零件特点,制定出合理的蝶阀阀体和碟板的加工工艺方案;对蝶阀密封面关键尺寸的粗、精加工进行不同切削工艺参数组合,采取量化分析的方法,获得满足蝶阀密封面加工精度的最佳切削工艺参数组合。4、运用已获得的密封面加工精度切削参数组合对蝶阀进行加工,对阀体和碟板各加工出10组数据,通过蝶阀液压试验台采取单因素变量法,测得蝶阀关键尺寸加工偏差与泄漏量的关系,最终得到了影响蝶阀密封性能关键尺寸偏差的最佳参数组合。结果表明:本课题所构建的加工精度与密封性能的关联模型、加工误差溯源的数学模型以及获得的最佳切削工艺参数组合和关键尺寸偏差组合,在理论上能给蝶阀密封面的设计和优化提供帮助,按照本课题所提出的加工方案加工出的阀体和碟板,能够更好的满足三偏心金属密封蝶阀的工况要求。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH134;TG659

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