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1
Content available Analysis of Cooling Curves of Nodular Cast Iron
Bartošová M., Pribulová A., Eperješi Š., Futáš P.
Journal of Casting & Materials Engineering
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2018
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Vol. 2, no. 1
1--4
EN
The solidification of cast iron is a complex process with characterized entrance and marginal conditions. Thermal analysis is one of the processes that allows us to observe the solidification of alloys. There is a possibility of gaining information about the melted cast iron quality and predicting the final properties of the cast by evaluating the scanned cooling curves by solidification (stable and metastable system). This article deals with the study and analysis of cooling curves taken from production conditions of a foundry during ductile cast iron production. The aim is to discover the reproduction and reliability of the thermal analysis results of cast iron. The study of the progress of the cooling curves and their first derivation to follow the reactions of the curves to changing factors in the production process.
2
Content available Increasing of Utility Properties of Grey Cast Iron Castings with Heat Treatment
Eperješi Š., Malik J., Vasková I., Fecko D.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 2
13--16
EN
Grey cast iron belongs to materials for casting production, which have wide application for different industry branches. Wide spectrum of properties of these materials is given by the structure of base metal matrix, which can be influenced with heat treatment. Processes of annealing can be applied for grey cast iron without problems. During heat treatment processes, where higher cooling rates are used, the thermal and structural strains become important. Usage and conditions of such heat treatment for grey cast iron castings of common production are the subject of evaluation of this article.
3
Content available Influence of Technological Parameters of Furane Mixtures on Shrinkage Creation in Ductile Cast Iron Castings
Vasková I., Hrubovčáková M., Eperješi Š., Malik J.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 3
1037--1040
EN
Ductile cast iron (GS) has noticed great development in last decades and its boom has no analogue in history humankind. Ductile iron has broaden the use of castings from cast iron into areas, which where exclusively domains for steel castings. Mainly by castings, which weight is very high, is the propensity to shrinkage creation even higher. Shrinkage creation influences mainly material, construction of casting, gating system and mould. Therefore, the main realized experiment was to ascertain the influence of technological parameters of furane mixture on shrinkage creation in castings from ductile iron. Together was poured 12 testing items in 3 moulds forto determine and compare the impact of various technological parameters forms the propensity for shrinkage in the casting of LGG.
PL
W ostatnich latach obserwuje sie intensywny wzrost produkcji odlewów z żeliwa sferoidalnego. Dotyczy to także zastępowania tym tworzywem odlewów staliwnych. W przypadku masywnych odlewów szczególnie duże znaczenie odgrywa przebieg skurczu tworzywa. Powstawanie skurczu wiąże się z materiałem odlewu, jego konstrukcja, układem wlewowym oraz materiałem formy. Celem badan zaprezentowanych w artykule jest ocena wpływu właściwości technologicznych formy na podstawie skurczu. Odlano 12 kształtek w 3 formach, aby ocenić wpływ jakości formy na skurcz odlewów z żeliwa sferoidalnego.
4
Content available Evaluation of Cracking Causes of AlSi5Cu3 Alloy Castings
Eperješi Š., Matvija M., Eperješi Ľ., Vojtko M.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 3
1089--1092
EN
Recently, the castings made from aluminum-silicon alloys by pressure die casting are increasingly used in the automotive industry. In practice, on these castings are high demands, mainly demands on quality of their structure, operating life and safety ensuring of their utilization. The AlSi5Cu3 alloy castings are widely used for production of car components. After the prescribed tests, the cracks and low mechanical properties have been identified for several castings of this alloy, which were produced by low pressure casting into a metal mould and subsequent they were heat treated. Therefore, analyses of the castings were realized to determine the causes of these defects. Evaluation of structure of the AlSi5Cu3 alloy and causes of failure were the subjects of investigation presented in this article.
PL
Zastosowanie odlewów ciśnieniowych ze stopów Al-Si ustawicznie wzrasta w przemyśle samochodowym, gdzie stopy te muszą spełniać wysokie wymagania odnośnie do jakości ich struktury, żywotności i bezpiecznego użytkowania. Odlewy ze stopu AlSi5Cu3 są szeroko stosowane w produkcji części samochodów. Wg pracy wady pęknięć wewnętrznych i niskie właściwości mechaniczne posiada część odlewów obrabianych cieplnie, odlanych do form metalowych pod niskim ciśnieniem. Praca poświęcona jest ocenie struktury i przyczynom pękania odlewów ze stopu AlSi5Cu3.
5
Content available remote Comparison of achieved parameters results of high-strength ductile cast iron by different way of heat treatment
Eperješi Š., Malik J., Vasková I., Eperješi Ľ., Fecko D.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1s
55-57
EN
Because of assecuration of requirements for commercial production of ductile cast iron castings were provided the tests of heat treatment of these castings for achieving the desired strength, hardness and ductility. High-strength cast iron can be assured by heat treatment - isothermal refinement or hardening with tempering. Achieved results shown the way of realization this kind of heat treatment and its utilization in practical conditions.
6
Content available remote Experience in forming and core mixtures by AlpHhaset technology
Vasková I., Smolková M., Malik J., Eperješi Š.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 2
141-144
EN
Chemically bound mixtures have had the evolution effect upon the economical and quality aspects of the foundry operations since they presentation at the market. The higher output and significantly increased production efficiency of moulds and cores has lead to the material increase in the quality and profit of the foundries. It can be seen that in last several years the knowledge of bounds based on the organic resins has made enormous advances. The higher strength, improved properties under elevated temperatures, the reduction of the environmental impacts of the organic bounds and at the same their highly improved regenerationability ensure that these systems will be still more significant binding system. The organic binding systems are predominantly being developed recemtly. The technology AlpHaset is ranked among the alkali binding systems. This technology has certain disadvantages - lower strength, speed of hardening- which have been gradually eliminated.
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