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1
Content available The Quality of Steel Castings in Terms of Precision Ceramic Mould Structure
Biernacki R., Haratym R., Kwapisz J.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 1 spec.
9--12
EN
In the opinion of metrologists, technologists and trybologists surface microgeometry is one of the most important factors affecting the performance characteristics of the machine parts (resistance to wear, sliding and lubricating properties, durability and tightness of joints, fatigue strength, corrosion resistance, etc.). The analysis was made of the ceramic mould elements structure influence on the microgeometry of steel castings surface and their dimensional accuracy. To assess the structure of the ceramic mould previous studies made with usage of computer tomography where used, those studies highlight the ceramic mould structure anisotropy and its properties.
2
Content available Studies of gas atmosphere near the metal-mould interface during casting and solidification of ductile iron
Mocek J., Chojecki A.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 4
166-170
EN
In sand moulds, at a distance of 3 mm from the metal-mould interface, the sensors of temperature, and of oxygen and hydrogen content were installed. Temperature and the evolution of partial gas pressure have been analysed in moulds bonded with bentonite with or without the addition of seacoal, water glass or furan resin. Moulds were poured with ductile iron. For comparison, also tests with the grey iron have been executed. It was found that the gas atmosphere near the interface depends mainly on the content of a carbonaceous substance in the mould. In the green sand moulds with 5% of seacoal or bonded with furan resin, after the mould filling, a sudden increase in the hydrogen content and the drop of oxygen is observed. This gas evolution results from the oxidation of carbon and reduction of water vapour in the mould material, and also from the reduction of water vapour and alloy reoxidation. In carbon-free sand, the evolution in the gas composition is slower because water vapour is reduced only at the interface. Changes of oxygen and hydrogen content in the controlled zone are determined by the transport phenomena.
3
Content available remote Gas pressure in sand mould poured with cast iron
Chojecki A., Mocek J.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1
9-14
EN
The results of measurements of gas pressure in foundry moulds made from sands bonded with bentonite, sodium silicate and furan resin were disclosed. It was found that the maximum pressure during pouring of mould with metal occurs in the case of bentonite sands, especially with the addition of coal dust. The effect of this pressure on the formation of surface defects in castings was examined.
4
Content available remote Możliwości oceny nieciągłości powierzchniowych odlewów
Sozański L.
Archiwum Odlewnictwa
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2006
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R. 6, nr 18/2
331--336
PL
Jednym z podstawowych elementów oceny jakości odlewu jest stan jego powierzchni. W normach europejskich szereg dokumentów technicznych określa metody, sposób i interpretację wyników badania powierzchni odlewu. W pracy rozpatrzono niektóre aspekty związane z określaniem nieciągłości powierzchniowych w trakcie badań wizualnych, penetracyjnych i magnetyczno proszkowych odlewów. Zwrócono uwagę na wymagania ogólne dotyczące uprawnień personelu oraz warunków w jakich należy te badania przeprowadzać.
EN
One of fundamental components of the assessment of the casting’s quality are properties of its surface. There are documents in the European Standards in which methods, ways and interpretations of results of casting’s surface investigation are defined. In the paper some aspects connected with casting’s surface discontinuities description during visual examination, penetrant testing and magnetic-particle testing were presented. The formal requirements concerning personnel qualification and conditions of testing were highlighted.
5
Content available remote Oddziaływanie produktów cieplnego zgazowania modelu polistyrenowego na powierzchnię odlewu
Żółkiewicz Z.
Archiwum Odlewnictwa
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2004
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R. 4, nr 11/2
332--337
PL
W trakcie zgazowywania modelu polistyrenowego nad powierzchnią ciekłego metalu gromadzą się produkty zgazowania modelu. Stykają się one z ciekłym metalem oraz z warstwą ceramiczną oddziaływując na nią. Te trzy podstawowe czynniki tj. właściwości metalu, formy oraz właściwości fizyko-chemiczne produktów zgazowania modelu polistyrenowego wpływają na prawidłowy przebieg procesu, na możliwość wystąpienia w odlewie wad np.: niedolewy, pęcherze gazowe, wżarcia, zwiększenie zawartości gazów (wodoru) w metalu. W referacie przedstawiono wpływ procesu technologicznego zgazowywania modelu polistyrenowego na zawartość wodoru i tlenu w żeliwie szarym.
EN
During evaporation of a polystyrene pattern, the products of evaporation are accumulated above the surface of molten metal. They enter into contact with both the liquid metal and the ceramic material, affecting specially the latter one. The three main factors, i.e. the properties of metal, the properties of mould, and the physico-chemical properties of the products of polystyrene pattern evaporation, affect the correct run of the process, and inrease the risk of occurrence of casting defects, like misruns. blowholes, penetrations, and increased gas content (hydrogen) in metal. In the paper an effect of the technological process of polystyrene pattern evaporation on the content of hydrogen and oxygen in grey iron was investigated.
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