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Content available Design of Proven Technology of Metal Foam and Porous Metal Casting Production
100%
Radkovský F. , Merta V. , Obzina T.
Archives of Foundry Engineering
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2021
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tom Vol. 21, iss. 1
125--131
EN
The article describes the design of a proven technology for the production of metal foam and porous metal by the foundry. Porous metal formed by infiltrating liquid metal into a mould cavity appears to be the fastest and most economical method. However, even here we cannot do without the right production parameters. Based on the research, the production process was optimised and subsequently a functional sample of metal foam with an irregular internal structure - a filter - was produced. The copper alloy filter was cast into a gypsum mould using an evaporable model. Furthermore, a functional sample of porous metal with a regular internal structure was produced - a heat exchanger. The aluminium alloy heat exchanger was cast into a green sand mould using preforms. Also, a porous metal casting with a regular internal structure was formed for use as an element in deformation zones. This aluminium alloy casting was made by the Lost Foam method. The aim is therefore to ensure the production of healthy castings, which would find use in the field of filtration of liquid metal or flue gases, in vehicles in the field of shock energy absorption and also in energy as a heat exchanger.
2
Content available Some Possibilities of Using Statistical Methods While Solving Poor Quality Production
75%
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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tom 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.
3
Content available Some Possibilities of Using Statistical Methods While Solving Poor Quality Production
71%
Lakomá R. , Čamek L. , Lichý P. , Kroupová I. , Radkovský F. , Obzina T. , Lakomá R. , Čamek L. , Lichý P. , Kroupová I. , Radkovský F. , Obzina T.
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