Döküm Sanayinde Süreç Tabanlı Temel Gösterimleri İle İstatistiksel Süreç Kontrolü

Abstract

In process control in the casting industry, the features of the product, such as diameter, thickness, density, are generally considered as quality characteristics and assignable causes affecting the process is tried to be determined by monitoring these quality characteristics in the quality control charts. However, instead of the features of the producing product as quality characteristics in the casting industry, the proportions of the elements that make up the product can also be accepted. Because the proportions of the elements that make up the product are desired to be within certain limits within the product and these generally vary. In addition, metal ratios, which can be selected as quality characteristics, can be monitored with quality control charts as in the properties of the product, but interpretation of out-of-control signals may not be sufficient. Therefore, in the solution of the problem, instead of quality control graphics, the process-oriented basis representations method in the literature can be used. As a result of the research in the literature, it has been determined that the process-oriented basis representations method has been used successfully in the modeling of geometric deviations in the manufacturing industry, but it is not applied in the process (chemistry, petro-chemistry, casting, etc.) industries, and in multivariate industrial production processes with interrelated quality characteristics. In this content, the aim of this study was is to show that metal alloy ratios can be used as quality characteristics and the process-oriented basis representations method can be applied in process control in the casting industry. The data used in the study were obtained from the production process of Brass Factory Directorate of Mechanical and Chemical Industry Company in Kirikkale province between 01 January 2015 and 31 March 2015. The module in the Minitab package program was used to create the control charts. At the end of the study, it has been determined that in the process control in the casting industry, the element ratios that make up the product produced as quality characteristics can be selected and positive results can be obtained by monitoring the quality characteristics selected in this way with the process-oriented basis representations method. It is evaluated that the results obtained in the study will contribute both to the domestic and foreign literature theoretically and to the quality control applications in terms of practicality in the casting industry.