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Evaluation of Collapsibility of Selected Core Systems

T. Obzina V. Merta J. Rygel P. Lichý K. Drobíková
Archives of Foundry Engineering | 2022 | vol. 22 | No 1 | 48-52 | DOI: 10.24425/afe.2022.140216
Keywords Foundry Foundry cores De-coring Knocking-out Collapsibility
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Abstract

There are mainly two different ways of producing sand cores in the industry. The most used is the shooting moulding process. A mixture of sand and binder is injected by compressed air into a cavity (core), where it is then thermally or chemically cured. Another relatively new method of manufacturing cores is the use of 3D printing. The principle is based on the method of local curing of the sand bed. The ability to destroy sand cores after casting can be evaluated by means of tests that are carried out directly on the test core. In most cases, the core is thermally degraded and the mechanical properties before and after thermal exposure are measured. Another possible way to determine the collapsibility of core mixtures can be performed on test castings, where a specific casting is designed for different binder systems. The residual strength is measured by subsequent shake-out or knock-out tests. In this paper, attention will be paid to the collapsibility of core mixtures in aluminium castings.
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Bibliography

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Authors and Affiliations

T. Obzina
1
V. Merta
1
ORCID: ORCID
J. Rygel
1
P. Lichý
1
ORCID: ORCID
K. Drobíková
1
  1. VSB - Technical University of Ostrava, Czech Republic

Core Blowing Process - Assessment of Core Sands Properties and Preliminary Model Testing

R. Dańko J. Dańko M. Skrzyński A. Burbelko
Archives of Foundry Engineering | 2014 | No 1 | DOI: 10.2478/afe-2014-0006
Keywords Foundry cores Blowing and shooting processes Experimental investigations Simulation calculations
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Abstract

The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting)

depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number,

distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are

selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand.

Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties on the basis

of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability

factor provide a better possibility of assessing the core sand behavior during flowing and core box filling, which indicate the value and

structure of the obtained compacting decisive – after hardening – for strength and permeability. The mentioned above aspects are analyzed

– on the basis of authors’ own examinations - in the hereby paper.

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Authors and Affiliations

R. Dańko
J. Dańko
M. Skrzyński
A. Burbelko

Parameters of the Two-Phase Sand-Air Stream in the Blowing Process

J. Danko R. Dańko M. Skrzyński A. Burbelko
Archives of Foundry Engineering | 2012 | No 4 | DOI: 10.2478/v10266-012-0102-1
Keywords Foundry cores Blowing and shooting processes Experimental investigations Simulation calculations
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Abstract

Theoretical problems concerning the determination of work parameters of the two-phase sand-air stream in the cores making process by blowing methods as well as experimental methods of determination of the main and auxiliary parameters of this process decisive on the cores quality assessed by the value and distribution of their apparent density are presented in the paper. In addition the results of visualisations of the core-box filling with the sand-air stream, from the blowing chamber, obtained by the process filming by means of the quick-action camera are presented in the paper and compared with the results of simulation calculations with the application of the ProCast software.
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Authors and Affiliations

J. Danko
R. Dańko
M. Skrzyński
A. Burbelko

Evaluation of Permeability Models for Foundry Molds and Cores in Sand Casting Processes

D. Sundaram T. Matsushita I. Belov A. Diószegi
Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 94-106 | DOI: 10.24425/afe.2024.149256
Keywords Permeability Kozeny model Density Foundry cores Foundry mold X-ray microtomography Component casting Cast iron
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Abstract

Predicting the permeability of different regions of foundry cores and molds with complex geometries will help control the regional outgassing, enabling better defect prediction in castings. In this work, foundry cores prepared with different bulk properties were characterized using X-ray microtomography, and the obtained images were analyzed to study all relevant grain and pore parameters, including but not limited to the specific surface area, specific internal volume, and tortuosity. The obtained microstructural parameters were incorporated into prevalent models used to predict the fluid flow through porous media, and their accuracy is compared with respect to experimentally measured permeability. The original Kozeny model was identified as the most suitable model to predict the permeability of sand molds. Although the model predicts permeability well, the input parameters are laborious to measure. Hence, a methodology for replacing the pore diameter and tortuosity with simple process parameters is proposed. This modified version of the original Kozeny model helps predict permeability of foundry molds and cores at different regions resulting in better defect prediction and eventual scrap reduction.
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Bibliography

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Authors and Affiliations

D. Sundaram
1
ORCID: ORCID
T. Matsushita
1
ORCID: ORCID
I. Belov
1
A. Diószegi
1
ORCID: ORCID
  1. School of Engineering, Jönköping University, Sweden

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