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1
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.
2
Content available remote The influence of the tablet height and final pressure on the final quality of the casting
Malik J., Eperješi Ľ., Fecko D., Gašpar Š.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1s
37-40
EN
The technology of die casting is in the connection of final quality of produced castings influenced by a lot of technological factors. These factors influence each other. This represents the complex reciprocal connections between the character of alloy, mould cavity filling time, construction of a mould and the efficiency of die cast machine. Between technological factors influencing the quality of casting belong the final pressure and the height of the tablet in the filling chamber. The final pressure should replace the gravity feeding of the molten metal into empty spaces of the casting and inhibit the clustering of bubbles, the tablet height eliminates the air amount enclosed in casting after pressing.
3
Content available remote Comparison of simulation programs MAGMASOFT and NOVAFLOW&SOLID in terms of results accuracy
Vasková I., Fecko D., Eperješi Ľ.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1s
51-54
EN
The use of foundry simulation programs is nowadays considered as a must have for any prosperous foundry. On the market there a plenty of simulation programs to simulate foundry processes, mainly filling of the moulds, solidification, prediction of foundry defects, mechanical properties and stresses that are in the castings during and after solidification. Between the best foundry simulation programs belong ProCAST, MAGMASoft and NovaFlow&Solid. Using these simulation programs will lead to the time and financial savings in the pre-production stage of castings production and also these programs can educate the technologists more deeply what is going on in the mould during the castings production. The work is concentrated on comparison of simulation programs MAGMASoft and NovaFlow&Solid from the results accuracy point of view. The main aim is to compare these two programs in simulation of filling and solidification and expected occurrence of defects on the same casting. The results obtained from simulations will be compared from the view of results accuracy, mainly the process of filling of the mould cavity, the solidification process, the expected occurrence of foundry defects and mechanical properties of the simulated castings. The next aim is to compare both simulation programs in terms of time consumption that is needed to prepare the simulation, simulate and evaluate the obtained results.
4
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.
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