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1
Content available Design of Proven Technology of Metal Foam and Porous Metal Casting Production
100%
Radkovský F. , Merta V. , Obzina T. , Radkovský F. , Merta V. , Obzina T.
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nr 1
2
Content available Design of Proven Technology of Metal Foam and Porous Metal Casting Production
94%
Radkovský F. , Merta V. , Obzina T.
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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.
3
Content available Influence of Silica Sand on Surface Casting Quality
94%
Beňo J. , Adamusová K. , Merta V. , Bajer T.
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tom iss. 2
5--8
EN
The current casting production of castings brings increased demands for surface and internal quality of the castings. Important factors, that influence the quality of casted components, are the materials used for the manufacture of moulds and cores. For the preparation and production of moulds and cores, in order to achieve a low level of casting defects, then it used a high quality input materials, including various types of sands, modified binders, additives, etc. However, even the most expensive raw materials are not a guarantee to achieve the quality of production. It is always necessary to choose the appropriate combination of input material together with an appropriate proposal for the way of the production, the metallurgical treatment of cast alloy, etc. The aim of this paper is to establish the basic principles for the selection of the base core mixtures components – sands to eliminate defects from the tension, specifically veining. Various silica sand, which are commonly used in foundries of Middle Europe region, were selected and tested.
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Content available Influence of Silica Sand on Surface Casting Quality
84%
Beňo J. , Adamusová K. , Merta V. , Bajer T. , Beňo J. , Adamusová K. , Merta V. , Bajer T.
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nr 2
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