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Some Possibilities of Using Statistical Methods While Solving Poor Quality Production

Lakomá R., Čamek L., Lichý P., Kroupová I., Radkovský F., Obzina T.

Archives of Foundry Engineering

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2021

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Vol. 21, iss. 1

18--22

EN

This paper presents an overview of a research on six practical cases that were solved in a precise casting company where parts are cast by the mean of the low-wax casting method (investment casting) in order to decrease poor quality production. The steel cast parts production technology by the lost-wax method requires the detailed work procedures observation. On the base of statistical processing data of given types of casting products, it was possible to assess the significance of each particular checking events by using the statistical hypothesis testing. The attention was focused on wax and ceramic departments. The data in technological flow were compared before and after the implementation of the change and statistical confirmative influences were assessed. The target consisted in setting such control manners in order to get the right conditions for decreasing poor quality parts. It was evidenced that the cast part defect cause correct identification and interpretation is important.

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Some Possibilities of Using Statistical Methods While Solving Poor Quality Production

Lakomá R., Čamek L., Lichý P., Kroupová I., Radkovský F., Obzina T.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 1

18--22

EN

This paper presents an overview of a research on six practical cases that were solved in a precise casting company where parts are cast by the mean of the low-wax casting method (investment casting) in order to decrease poor quality production. The steel cast parts production technology by the lost-wax method requires the detailed work procedures observation. On the base of statistical processing data of given types of casting products, it was possible to assess the significance of each particular checking events by using the statistical hypothesis testing. The attention was focused on wax and ceramic departments. The data in technological flow were compared before and after the implementation of the change and statistical confirmative influences were assessed. The target consisted in setting such control manners in order to get the right conditions for decreasing poor quality parts. It was evidenced that the cast part defect cause correct identification and interpretation is important.

3

Hypothesis Testing to Confirm the Influence of Technological Parameters on Poor Quality Production

Lakomá R., Čamek L.

Archives of Metallurgy and Materials

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2014

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Vol. 59, iss. 3

1063--1067

EN

This report addresses some chosen statistical methods that could be used to confirm and set up the required functions of technology in foundry companies where parts are cast by the low-wax casting method, whereas these chosen statistical methods are intended to reduce poor quality of produced parts. This research was made on a practical example. Utilization of hypothesis testing methods was examined in order to confirm technological parameters having some influence on the products quality. The data were compared before and after the implementation of changes aimed at reduction of poor quality produced parts in the wax department. The results confirmed that the implemented change had a statistically conclusive influence.

PL

Artykuł przybliża niektóre wybrane metody statystyczne, które można wykorzystać w celu sprawdzenia ustawień wymaganych funkcji w technologii odlewania metodą wosku traconego, do zmniejszenia wad produkcji. Badania przeprowadzono na konkretnym przykładzie. Zbadano wykorzystanie metod testowania hipotez w celu sprawdzenia parametrów technologicznych wpływających na jakość odlewów. Porównano dane przed i po wprowadzeniu zmian w celu ograniczenia wad produkcji w dziale woskowni. Wyniki potwierdziły, że wprowadzona zmiana miała statystycznie udokumentowany wpływ.