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Opening Material as the Possibility of Elimination Veining in Foundries

Hrubovčáková M., Vaskova I., Benkova M., Conev M.

Archives of Foundry Engineering

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2016

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Vol. 16, iss. 3

157--161

EN

The main bulk density representation in the molding material is opening material, refractory granular material with a particle size of 0.02 mm. It forms a shell molds and cores, and therefore in addition to activating the surface of the grain is one of the most important features angularity and particle size of grains. These last two features specify the porosity and therefore the permeability of the mixture, and thermal dilatation of tension from braking dilation, the thermal conductivity of the mixture and even largely affect the strength of molds and cores, and thus the surface quality of castings. Today foundries, which use the cast iron for produce of casts, are struggling with surface defects on the casts. One of these defects are veining. They can be eliminated in several ways. Veining are foundry defects, which arise as a result of tensions generated at the interface of the mold and metal. This tension also arises due to abrupt thermal expansion of silica sand and is therefore in the development of veining on the surface of casts deal primarily influences and characteristics of the filler material – opening material in the production of iron castings.

2

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.

3

Tests of moulding mixture by using various clay binder granularity

Vasková I., Malik J., Futáš P.

Archives of Foundry Engineering

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2009

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Vol. 9, iss. 1

29-32

EN

Bentonite as foundry binder has dominant and important significance in Slovak and Czech foundries. Present - day wide world produce of casts is estimated to 80 mil ton. There are about 60-70% casts into bentonite moulding mixtures. We say about mixture of first binder generation where join is results of capillary pressure force and Van der Waals force (forming mixture on the base of bentonite binder). European initions of this technology be included in thirties last century. This technology will have dominant position in spite of formation and development of new manufacturing processes in future. There are these advantages of using moulding mixture on the bentonite base: high value of compression strength and plasticity of this binder is achieved at low content of surface moisture - this fact makes it possible to pour by technology of raw clay, relatively low costs by up to raw material, Cca 95 - 98% repeated usage of moulding mixture, high productivity of used production engineering, high quality of casts (quality surface, uniform accurance, casts without defects) is assured by modern way of ramming, hygienic and ecological advantage.

4

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.

5

Súvislosti medzi frakčnou skladbou ostriva a priedušnosťou jadier vyrábaných metódou hot-box

Bobok L'., Schützová D., Kiovská K.

Archiwum Odlewnictwa

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2006

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R. 6, nr 18/2

411--416

CS

Priedušnosť foriem a jadier patrí medzi základné technologické vlastnosti foriem a jadier. V príspevku sú popísané niektoré výsledky získané pri hodnotení vplyvu frakčnej skladby ostriva, stupňa rovnomernosti a stupňa zhustenia na priedušnosť jadier vyrábaných metódou Hot-Box.

EN

The contribution deals with the possibilities of influence of cores permeability. Cores made by Hot-Box method. General independent variables, uniformity ratio, size of medial grain and compression ratio before baking were followed.