Intranet-based Spc Theory, Applied Research, In The Production Process Of Transmission

After introducing SPC theory and usual tools briefly, and considering fully the characteristics of production line in the transmission plant, which belongs to Nanjing Fiat Automobile Corp., a SPC soft system is designed, which bases on Intranet and managerial skills in the paper.According to the software engineering theory, functional requirement, feasibility analysis, data flow analysis and so on, are accomplished successfully, and system functional model and data model are built by using IDEF method. and this system database is fulfilled initially by UML, a fault diagnosis expert system, which bases on fuzzy recognition is constructed, and a whole run procedure of the SPC soft system is demonstrated at last. Combining the advantage of x chart with the EWMA chart, several kinds of control chart for process are designed in a completely new design method, which is composed of chart? R chart and EWMA chart. The relationship between fault sources and all exceptional patterns of control chart and histogram is expatiated in the paper, a fuzzy relation matrix which bases on expert knowledge is built too, and shown successfully in fault diagnosis. For realizing automatic recognition to all exceptional pattern by control chart and histogram, each mathematical model of the exceptional pattern is built. By a example, the SPC soft system is proven achieving all of the original design aims.