Possibilities of Burrs Elimination From Cores Produced With Cold-Box-Amine Technology

Hrubovčáková, Martina; Vasková, Iveta

doi:10.12776/ams.v21i1.548

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…Fig. 5a,b These results are in conformity with the ones achieved in [13,14], and what is more, the material used in the research was from the same batch as in our case. The process of pitting formation, from its initiation, through growth up to reaching sizes and numbers that cause the testing device to switch off, is another phenomenon requiring certain attention.…”

Section: Resultssupporting

confidence: 91%

Plasma nitriding and its influence on contact fatigue of sintered steel

Rodziňák¹,

Hvizdoš²,

Čerňan³

et al. 2013

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Plasma nitriding treatment in combination with shot peening is a promising way of material processing to improve contact fatigue resistance of PM components made of prealloyed Astaloy CrL powder. This powder was used to manufacture four material variants differing by carbon contents 0.3 % and 0.7 % C, and by surface status (as received and shot peened). Tests were done on a pin-on-disc type device and evaluated in terms of formation of pittings at 50 × 10 6 cycles. They revealed the positive effects of plasma nitriding. In the material with 0.3 % C, the fatigue resistance increased by 65 % and if the nitriding was preceded by shot peening, it increased by 172 %. In the material with 0.7 % C, the corresponding increase was 38 % and 107 %, respectively. The surface nitrided layer, the mechanisms of its damage, and causes of pitting formation and growth depending on Hertzian stresses are described. K e y w o r d s : Cr-sintered steels, contact fatigue, surface modification, pittings

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Section: Resultssupporting

confidence: 91%

Plasma nitriding and its influence on contact fatigue of sintered steel

Rodziňák¹,

Hvizdoš²,

Čerňan³

et al. 2013

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“…Looking at the expansion of quartz sands with the additions of iron oxide, it can be seen that even when there is a softening, the phase of alpha SiO 2 does not change to beta SiO 2 and tridymite. The volume loss continues along with the increased temperature until the change at the fourth stage [2,4].…”

Section: Theoretical Partmentioning

confidence: 99%

“…This increase in tensile strength withstands any stresses and reduces the occurrence of burrs (Fig. 1) [2,3,5]. …”

Section: Theoretical Partmentioning

confidence: 99%

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Influence of additives in core-forming mixture

Vasková

Hrubovčáková

Conev

2017

Archives of Metallurgy and Materials

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In recent years, ingredients, also known as additives, which appreciably affect the quality of the casting surface, come to the fore. Additives -lower the temperature at which SiO 2 (major component of silica sand) begins to soften and create a melt on the surface of the grains, increase the reactivity and decrease the temperature of a transition to tridimite and cristobalit. These passages support the increase of volume of subsurface sand stress and the tension for the formation of burrs and other casting defects on the surface of the core or the mold.Nowadays, as a great emphasis is put on the quality of the casts, it is therefore necessary to pay attention to these additives, which can effectively reduce the labor intensity in the production of castings and ensure a quality surface of castings.

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“…The values of thermal expansion of silica sand and several types of non silica sands can be compared according to the following Fig.1. [2,3] …”

Section: Introductionmentioning

confidence: 99%

Opening Material as the Possibility of Elimination Veining in Foundries

Hrubovčáková

Vasková

Benková

et al. 2016

Archives of Foundry Engineering

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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.[1] 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.

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Possibilities of Burrs Elimination From Cores Produced With Cold-Box-Amine Technology

Cited by 6 publications

References 6 publications

Plasma nitriding and its influence on contact fatigue of sintered steel

Plasma nitriding and its influence on contact fatigue of sintered steel

Influence of additives in core-forming mixture

Opening Material as the Possibility of Elimination Veining in Foundries

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