Research On NC Machining Technology Of Vertical Plate Three Eccentric Metal Sealing Butterfly Valve

The sealing effect of butterfly valve sealing surface is not only related to the theoretical design,and processing technology are inseparable.The valve body and disc plate are key parts of the three eccentric metal sealing butterfly valve,which structure is complexd,and processing is difficult,the valve body and disc plate processing is good or not directly affect the quality of the valve sealing performance,and processing quality of the sealing surface of the machining accuracy to reflect the machining accuracy of CNC machining and processing scheme,equipment,processing methods and cutting parameters have a certain relationship.The butterfly processing method and the traditional method has been backward,the working intensity and working environment is relatively poor,thus affecting the component production efficiency,resulting that it is difficult to ensure value processing quality,and then affecting the butterfly valve sealing performance.Therefore,it is necessary to explore the butterfly valve body and disc plate CNC machining technology,in order to obtain high precision butterfly valve sealing surface.The founder of DN300 vertical plate valve group produced three eccentric metal sealing butterfly valve as the research object,combined with theoretical knowledge of NC machining process,the machining process and cutting parameters to the machining tests were carried out,and the processing of the butterfly valve was made a seal test.Specific research contents are as follows:1、The analysis of the butterfly valve sealing surface position and contour profil,according to the structure characteristics of the valve body and disc and seal performance requirements,the establishment of the valve body and disc sealing surface machining accuracy and butterfly valve sealing performance of the correlation model.2、To introduce the key factors affecting the performance of the valve seal,and then establish the mathematical model of valve key size error tracing,the actual manufacture of butterfly valve quality analysis,illustrates the influence of critical dimension deviation of the processing and the sealing performance of the valve manufacturing quality.3、According to the characteristics of the valve body and plate,formulating the processing scheme of butterfly valve body and dish plate reasonable;Taking different parameters cutting combinationrough for key dimensions of rough and finishmachining on the valve sealing surface,adopting the method of quantitative analysis,obtained the best parameters combination of cutting surface machining precision of the sealing butterfly valve.4、 Using the sealing surface precision cutting parameters for processing of the butterfly valve,and processing 10 groups of data about value body and disc valve,butterfly valve through the hydraulic test bench adopts the single factor variable method,the relationship between the measured valve key size machining deviation and leakage,finally get the best parameter combination key size deviation Butterfly valve the influence of performance.The results show that the mathematical model of the processing precision of the subject and the sealing performance of correlation model and error tracing and obtain the optimum process parameters of cutting combinations and key size deviation,which can help butterfly valve sealing surface design and Optimization in theory,in accordance with the processing scheme proposed in this work is processed by the body and the disc plate,to better meet the requirements of the three eccentric metal sealing butterfly valve condition.