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Multivariate nonconformity analysis for paving stone manufacturing process improvement

Knop Krzysztof

Management Systems in Production Engineering

2022

nr 4 (30)

331--341

The article presents the result of multidimensional analysis of 'Behaton' type paving stones' nonconformities for improving the production process by improving the quality of the final product. Statistical tools, including SPC tools and quality tools, both basic and new, were used to analyse nonconformities in the spatial-temporal system, i.e. according to the type of nonconformity and according to the examined months. The purpose of using the data analysis tools was to thoroughly analyse the cases of nonconformities of the tested product, obtain information on the structure of these nonconformities in the various terms, and information on the stability and predictability of the numerical structure of nonconformity over time. Potential causes influencing a large percentage of paving stone defects were identified, factors and variables influencing the most frequently occurring nonconformities were determined, and improvement actions were proposed. As a result of the multidimensional and multifaceted analyses of paving stone nonconformities, it was shown that in the structure of nonconformity there were cases that were unusual in terms of the number of occurrences, and the lack of stability in the number of nonconformities in terms of the examined months was proven. Three critical nonconformities of the tested product were identified: side surface defects, vertical edge defects, and scratches and cracks. It was determined that the most important factor causing a large percentage of nonconformity was the time of shaking and vibrating the concrete, which was significantly related to the technical condition of the machines, and the most important reason for a large percentage of paving stone nonconformity was the lack of efficient maintenance. Machine, method, and man turned out to be the most important categories of problem factors and specific remedial actions were proposed. A multidimensional look at the structure of paving stone nonconformity as well as the factor and causes causing them has brought a lot of valuable information for the management staff of the analysed company, thanks to which it is possible to improve the production process and improve the quality of the final product.

Arkusz kalkulacyjny w doskonaleniu procesu analizy niezgodności produktów w przedsiębiorstwie przemysłowym

Szczęśniak B., Samek J.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

2012

z. 63a

233--243

W artykule zaprezentowano wykorzystanie arkusza kalkulacyjnego MS Excel do wspomagania procesu przeprowadzania analizy niezgodności produktów powstających na wydziale walcowni. W sposób szczegółowy omówiono dotychczasowy sposób realizacji procesu. Przedstawiono stworzone w arkuszu kalkulacyjnym narzędzie informatyczne, a także zaprezentowano sposób przeprowadzania analizy z jego wykorzystaniem. Zastosowanie narzędzia pozwoliło na uzyskanie wymiernych korzyści, takich jak skrócenie czasu realizacji procesu o ok. 80% oraz eliminację błędów, które wcześniej występowały w przygotowywanych raportach.

The article provides a discussion on the MS Excel spreadsheet application as a supporting tool for the process of nonconformity analysis of products manufactured at a rolling mill. The authors have described in detail how the process used to be handled. An IT tool created using the spreadsheet as well as the method to conduct analysis by means of the said tool have been presented. Its application brought certain tangible benefits, such as shortening of the process time by ca. 80% and elimination of the errors which could previously be found in the reports being prepared.