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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.

2

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

Influence on the quality of secondary aluminum alloy casts by Mn addition

Kuchariková Lenka, Tillová Eva, Mazur Magdalena, Herčko Adrián

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

319--325

EN

The quality of aluminum casts is necessary in order to reach sufficient properties required for application. The decreasing in the properties of aluminum cast mainly related with microstructure, especially with size and morphology of second phases. One of such second phases in aluminum alloys are the β-phases. These phases are unwonted mainly because of the decreasing of mechanical properties. The contribution is deal with influence of addition of Mn to affecting the formation of βphases in the AlSi7Mg0.3 and AlSi7Mg0.6 cast alloys. These materials are used for application especially automotive industry. The results shows, that addition of Mn is not sufficient for affecting of formation of the Fe-rich phases in AlSi7Mg0.6 cat alloys, but in the AlSi7Mg0.3 this addition lead to changes in formation of Fe-rich intermetallic phases.

4

The quality of precision steel castings produced in the Replicast CS process

Tomasik J., Haratym R., Kwapisz J.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 2 spec.

209--212

EN

The quality in ceramic mould precision casting process include mostly surface quality of casts and their dimensional accuracy represented by six sigma deviation from the nominal dimensions (ΔL6δ). This article present achieved results of examination of cast’s surface finish. The dimensional analysis accuracy of expended polystyrene patterns and castings made from these patterns was executed.

PL

Jakość w procesie odlewnictwa precyzyjnego w formy ceramiczne obejmuje przede wszystkim stan powierzchni odlewów i ich dokładność wymiarową rozumianą jako odchyłkę sześciosigmową wymiarów nominalnych (ΔL6δ). W artykule zaprezentowano uzyskane wyniki badań stanu powierzchni odlewów. Wykonano analizę dokładności modeli z polistyrenu i odlewów wykonanych na tych modelach.