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1
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.
2
Content available Usage of connor inlets to eliminate shrinkage
Fecko D., Vasková I., Eperješi L'., Závodný M.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 3
25-28
EN
The demand for castings of high quality and sound work is nowadays very high. The production of sound castings without foundry errors is the big issue in modern foundries. Foundry simulation software can do a lot to help improve the disposition of castings, gating system and feeder system, and assure good filling and solidification conditions, and also produce sound casting without the need of the old method of 'try and error'. One can easily change a lot of parameters for filling and solidification, and create the best proposal for production. Connor inlets have two functions. One is that it serves as an ingate, through which molten metal passes and comes into the mould cavity. The second function is that it serves as a feeder and substitutes the metal contracted during solidification and cooling of the castings. It can also save quite a lot of metal in comparison to classic feeders.
3
Content available The dependence of castings quality produced in clay moulding mixtures from the properties of binder based on a montmorillonite
Vasková I., Fecko D., Malik J.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 3
123-128
EN
Casting quality depends on many factors including the quality of the input materials, technology, material securing and last but not least, the mould into which the casting is casted. By pouring into a single-shot mould, based mainly on 1st generation binders, is is a very important factor. Basically, a bentonite mixture represents either a three- or four-component system, but each component of the system is a heterogeneous substance. This heterogeneity punctuates mainly a non-stationary heat field, presented throughout the whole process of the casting production. The most important component is a binder and in the case of first generation binders mostly bentonites are used - clays that contain minimum of 80% of montmorillonite.
4
Content available Homogenity of die casting and returning material
Malik J., Vasková I., Fecko D., Futáš P.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
61-64
EN
Homogeneity of die castings is influenced by wide range of technological parameters as piston velocity in filling chamber of die casting machine, filling time of mould cavity, temperature of cast alloy, temperature of the mould, temperature of filling chamber, surface pressure on alloy during mould filling, final pressure and others. Based on stated parameters it is clear, that main parameters of die casting are filling time of die mould cavity and velocity of the melt in the ingates. Filling time must ensure the complete filling of the mould cavity before solidification process can negatively influence it. Among technological parameters also belong the returning material, which ratio in charge must be constrained according to requirement on final homogeneity of die castings. With the ratio of returning material influenced are the mechanical properties of castings, innerhomogeneity and chemical composition.
5
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.
6
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.
7
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.
8
Content available remote Physical and chemical clay binder characteristics from various locality and their influence on some technological properties of bentonite mouling mixtures
Vasková I., Fecko D., Malik J., Futáš P.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1 spec.
211--216
EN
The aim of this paper is to explore the complex physical – chemical characteristics of bentonite of slovak provenance and to compare with non-slovak, which is considered as European highest quality standard in foundry and to compare from the point of foundry application. These characteristics of raw material have direct relationship with technological properties of bentonite sand mixtures and mainly with the quality of castings poured into these mixtures. To compare technological properties of bentonite forming mixtures with use of various clay types point of view application in foundry industry.
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