硬密封蝶阀加工过程中的累积误差控制

发布时间：2018-05-22 20:53

本文选题：结构分析 + 数据测量　；参考：《兰州理工大学》2016年硕士论文

【摘要】：蝶阀是一种用来实现管路系统通断及流量控制的管道元件,已在石油、化工、冶金、水电等许多领域中得到广泛地应用,特别是在大中型口径及中低压力的使用领域方面,蝶阀已经成为主导的阀门形式。本课题以DN600双偏心法兰硬密封蝶阀为研究对象。其关键部位密封结构中,蝶板为球墨铸铁材质堆焊硬质合金,阀座为0Cr18Ni9(304),经过加工后进行氮化处理。该研究对象具有硬密封蝶阀的耐高温,抗磨损,机械性能好等特性,但密封效果较差。文章从以下三部分进行研究与论证。首先,对研究对象结构,关键影响因素及关键部位结构进行分析,对影响硬密封蝶阀质量的加工过程因素进行分析。通过加工过程中影响蝶板与阀座之间的干涉效果因素,找到硬密封蝶阀的关键部位与关键零件参数,通过对关键参数分析找到影响硬密封蝶阀加工制造过程中的关键因素。然后,通过对影响因素分析,测量加工过程关键部位数据。对所测量的误差数据运用正态分布分析方法,分析数据结果。运用误差控制方法,找出控制加工过程累积误差的方法。通过对控制方法的分析与研究,制定出合理的加工方法,得出改变蝶板加工工艺的新定位方式和新加工方法。并通过改进加工方法的分析与研究,分析数控编程方式,验证数控实际加工方法,来控制硬密封蝶阀关键部位的加工过程累积误差。最后,以实际加工结果来验证新的加工工艺和加工方法,并对关键部位加工数据进行测量、验证,确定该改进方法的可行,最终得出硬密封蝶阀加工过程累积误差的控制方法,以达到本课题的研究目的。
[Abstract]:Butterfly valve is a kind of pipeline element used to realize pipeline system break and flow control. It has been widely used in many fields, such as petroleum, chemical industry, metallurgy, hydropower and so on, especially in the field of large and medium caliber and medium and low pressure. Butterfly valve has become the dominant valve form. This topic takes DN600 double eccentric flange hard seal butterfly valve as the research object. In the sealing structure of the key parts, the spheroidal plate is made of ductile iron and the valve seat is 0Cr18Ni9C304N, which is treated by nitridation after processing. The research object has the characteristics of high temperature resistance, wear resistance and good mechanical properties of hard sealing butterfly valve, but the sealing effect is poor. The article carries on the research and the demonstration from the following three parts. Firstly, the research object structure, the key factors and the key position structure are analyzed, and the processing process factors that affect the quality of hard seal butterfly valve are analyzed. The key parts and key parts parameters of hard seal butterfly valve are found by influencing the interference effect factors between butterfly plate and valve seat in the process of machining, and the key factors affecting the manufacturing process of hard seal butterfly valve are found by analyzing the key parameters. Then, through the analysis of the influencing factors, the data of the key parts of the processing process are measured. The measured error data are analyzed by normal distribution analysis method. The error control method is used to find out the method of controlling the cumulative error in machining process. Through the analysis and research of the control method, the reasonable processing method is worked out, and the new positioning method and the new processing method to change the processing technology of the butterfly plate are obtained. Through the analysis and research of the improved machining method, the NC programming method is analyzed, and the NC machining method is verified to control the cumulative errors in the machining process of the key parts of the hard-sealed butterfly valve. Finally, the new processing technology and method are verified by the actual processing results, and the processing data of the key parts are measured and verified, and the feasibility of the improved method is determined. Finally, the control method of cumulative error in the machining process of hard seal butterfly valve is obtained. In order to achieve the purpose of this subject.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH134

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