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Svidró, József TamásORCID iD iconorcid.org/0000-0002-3644-213X
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Publications (10 of 15) Show all publications
Svidró, J. T. & Diószegi, A. (2018). A novel measurement method to study the thermal aspects of moulding mixture decomposition. In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings: . Paper presented at 73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland (pp. 113-114). Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association
Open this publication in new window or tab >>A novel measurement method to study the thermal aspects of moulding mixture decomposition
2018 (English)In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings, Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association , 2018, p. 113-114Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

A wide variety of moulding mixtures are extensively used in the process of sand casting of metal components. The sector is continuously developing in production volume, moreover the expectations from the customers are increasing on monthly basis, also from the quality point of view. Even though mould and core manufacturing are well-organized processes in most foundries, technological problems still appear which may lead to casting defects. These trends are forcing metal casters to come up with fitting strategies to solve their daily production challenges, while their suppliers are expected to keep up the continuous development of their existing foundry products and to find innovative solutions. Research on moulding materials and their properties must also take the step forward accordingly to generate the necessary new knowledge. This paper summarizes the latest results of a novel measurement method suitable for studying the degradation characteristics of different moulding materials from a new perspective. The fundamentals of the method are based on thermal analysis, focusing on the heat absorption behaviour of sand mixtures regardless of binder type/amount or manufacturing process. 

Place, publisher, year, edition, pages
Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association, 2018
Keywords
Cold-box, Greensand, Moulding mixture, Thermal analysis, Cold boxes, Continuous development, Degradation characteristics, Innovative solutions, Manufacturing process, Measurement methods, Mixture decomposition, Foundries, Mixtures, Thermoanalysis, Molding
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-43375 (URN)2-s2.0-85062275328 (Scopus ID)9788390430638 (ISBN)
Conference
73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland
Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-03-22Bibliographically approved
Svidró, J. T., Seifeddine, S. & Ghassemali, E. (2018). Innovation in knowledge transfer from academia to the foundry industry - An advanced case. In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings: . Paper presented at 73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland (pp. 633-633). Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association
Open this publication in new window or tab >>Innovation in knowledge transfer from academia to the foundry industry - An advanced case
2018 (English)In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings, Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association , 2018, p. 633-633Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association, 2018
Keywords
Blended learning, Casting, Education, Foundry technology, Online
National Category
Metallurgy and Metallic Materials Pedagogical Work
Identifiers
urn:nbn:se:hj:diva-43369 (URN)2-s2.0-85062300609 (Scopus ID)9788390430638 (ISBN)
Conference
73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21Bibliographically approved
Svanängen, P., Svidró, J. T., Seifeddine, S. & Gustavsson, C. (2018). Life long educaion of foundry employees - A step forward. In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings: . Paper presented at 73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland (pp. 637-637). Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association
Open this publication in new window or tab >>Life long educaion of foundry employees - A step forward
2018 (English)In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings, Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association , 2018, p. 637-637Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association, 2018
Keywords
Blended learning, Education, Foundry technology, Online
National Category
Metallurgy and Metallic Materials Pedagogical Work
Identifiers
urn:nbn:se:hj:diva-43372 (URN)2-s2.0-85062275576 (Scopus ID)9788390430638 (ISBN)
Conference
73rd World Foundry Congress "Creative Foundry", 23-27 September 2018, Kraków, Poland
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21Bibliographically approved
Svidró, J. T. & Diószegi, A. (2018). Novel Measurement Method to Study Thermal Aspects of Molding Mixture Decomposition. Journal of Casting & Materials Engineering, 2(3), 63-66
Open this publication in new window or tab >>Novel Measurement Method to Study Thermal Aspects of Molding Mixture Decomposition
2018 (English)In: Journal of Casting & Materials Engineering, E-ISSN 2543-9901, Vol. 2, no 3, p. 63-66Article in journal (Refereed) Published
Abstract [en]

A wide variety of molding mixtures are extensively used in the process of the sand casting of metal components today. The sector is continuously developing in production volume; moreover, the expectations of customers are increasing on a monthly basis (also from a quality point of view). Even though mold and core manufacturing are well-organized routines in most foundries, technological problems still appear that can lead to technological problems and casting defects. These trends are forcing metal casters to come up with fitting strategies to solve their daily production challenges, while their suppliers are expected to keep up the continuous development of their existing foundry products and to find innovative solutions as well as new material combinations. Research on molding materials and their properties must, therefore, take a step forward accordingly to generate the necessary new knowledge to understand the behavior of mold and core mixtures during casting.

This paper summarizes the latest results of a novel measurement method suitable for studying the degradation characteristics of different molding materials from a new perspective. The fundamentals of the method are based on a thermal analysis, focusing on the heat-absorption behavior of greensand and two types of chemically bonded sands regardless of the binder type and amount or the manufacturing process.

Place, publisher, year, edition, pages
AGH University of Science and Technology Pres, 2018
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-42097 (URN)10.7494/jcme.2018.2.3.63 (DOI)
Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2018-11-20
Lidumnieks, K., Svidró, J. T. & Diószegi, A. (2018). The effect of various production parameters on the heat absorbing capacity of greensand. International Journal of Cast Metals Research, 31(1), 7-13
Open this publication in new window or tab >>The effect of various production parameters on the heat absorbing capacity of greensand
2018 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 31, no 1, p. 7-13Article in journal (Refereed) Published
Abstract [en]

Greensand is a widely-used material to produce sand moulds in high production, mainly for iron casting applications. Several authors have studied the high temperature behavior of greensand regarding to the vapour condensation and transfer zones, and the effect of different production parameters on the thermal conductivity. This work focuses on the effect of the mixture composition on the heat absorption (cooling) capacity of the greensand. During the experimental work, various greensand mixtures with changing bentonite + water and coal dust contents were prepared and tested by a novel application of Fourier thermal analysis. The method provides new thermophysical knowledge about moulding sand, through applying real casting conditions by the immersion of spherical sand samples into liquid iron. The findings of the work direclty contribute to the area of thermal sciences and also brings novel understandings to foundry technology in general.

Place, publisher, year, edition, pages
Maney Publishing, 2018
Keywords
Bentonite, cast iron, casting, coal dust, Fourier thermal analysis, greensand, heat absorption, thermal properties, Absorption cooling, Coal water mixtures, Iron, Mixtures, Sandstone, Thermal conductivity, Thermoanalysis, Thermodynamic properties, Foundry technology, Fourier, High temperature behavior, Mixture compositions, Novel applications, Production parameters
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-41017 (URN)10.1080/13640461.2017.1348005 (DOI)000428582500002 ()2-s2.0-85023164116 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2019-02-14Bibliographically approved
Campbell, J., Svidró, J. T. & Svidró, J. (2017). Molding and Casting Processes. In: Doru M. Stefanescu (Ed.), ASM Handbook, Volume 1A: Cast Iron Science and Technology (pp. 189-206). Materials Park, Ohio: ASM International
Open this publication in new window or tab >>Molding and Casting Processes
2017 (English)In: ASM Handbook, Volume 1A: Cast Iron Science and Technology / [ed] Doru M. Stefanescu, Materials Park, Ohio: ASM International, 2017, p. 189-206Chapter in book (Refereed)
Place, publisher, year, edition, pages
Materials Park, Ohio: ASM International, 2017
Series
ASM Handbook ; 1A
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-38130 (URN)978-1-62708-133-7 (ISBN)978-1-62708-134-4 (ISBN)
Available from: 2017-12-11 Created: 2017-12-11 Last updated: 2020-02-03Bibliographically approved
Svidró, J. T., Diószegi, A., Svidró, J. & Ferenczi, T. (2017). The effect of different binder levels on the heat absorption capacity of moulding mixtures made by the phenolic urethane cold-box process. Journal of thermal analysis and calorimetry (Print), 130(3), 1769-1777
Open this publication in new window or tab >>The effect of different binder levels on the heat absorption capacity of moulding mixtures made by the phenolic urethane cold-box process
2017 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 130, no 3, p. 1769-1777Article in journal (Refereed) Published
Abstract [en]

The phenolic urethane cold-box (PUCB) process was first introduced to the foundry industry in the late 1960s. Since then, it has become one of the most popular methods to make foundry purpose sand moulds and cores, utilized in the manufacturing of aluminium and cast iron cast components. The factors to be considered, affecting the general performance of a PUCB moulding mixture, are the temperature of sand, the moisture content, the mixing conditions, etc. Moreover, there are variable production parameters such as binder level, to improve certain properties of the mould and/or the core based on their specific area of application. These are mainly mechanical properties such as tensile or splitting strength. They have significant influences on the behaviour of the moulding material and are usually tested at room temperature. Although the production phases of the PUCB system are refined to a high extent today, the effect of binder content on the quality of the mould/core and the final casting should be supported by new approaches also in thermal sciences, interpreted in high-temperature environment. In this work, different PUCB mixtures were produced to evaluate the effect of various binder levels on the thermophysical properties of sand cores. Thermogravimetry, differential thermal analysis and a novel application of Fourier thermal analysis were used to study the decomposition processes of the PUCB mixture and to reveal the impact of binder level on the heat absorption (cooling) capacity of sand cores at temperatures relevant in the manufacturing of cast iron parts (1300 ± 10 °C).

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Casting process; TG–DTA; Fourier thermal analysis; Heat absorption; Phenolic urethane resin
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-37099 (URN)10.1007/s10973-017-6611-y (DOI)000415619800056 ()2-s2.0-85028008121 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2017-08-30 Created: 2017-08-30 Last updated: 2020-02-03Bibliographically approved
Svidró, J., Diószegi, A., Tóth, L. & Svidró, J. T. (2017). The influence of thermal expansion of unbonded foundry sands on the deformation of resin bonded cores. Archives of Metallurgy and Materials, 62(2), 795-798
Open this publication in new window or tab >>The influence of thermal expansion of unbonded foundry sands on the deformation of resin bonded cores
2017 (English)In: Archives of Metallurgy and Materials, ISSN 1733-3490, E-ISSN 2300-1909, Vol. 62, no 2, p. 795-798Article in journal (Refereed) Published
Abstract [en]

Depending on the preparation and the applied materials, moulds and cores can be of high rigidity or can be flexible. Although, chemically bonded moulding materials have relatively good flexibility, their high temperature behaviour determines the dimensional accuracy, the stresses in the castings and can induce several casting defects, such as rattail, veining, etc. The phenomenon is based on two major effects: the thermal expansion of the unbonded foundry sands and the deformation of the sand mixtures. The main objective of the present work was to study the relationship between these two effects, and to improve the knowledge related to the thermo-mechanical interactions between the casting and the mould. Dilatometric analysis of unbonded sand samples were performed and compared to the results of hot distortion tests of moulding mixture specimens. The results showed, that the thermal expansion of foundry sand largely influences the hot distortion behaviour, but depending on the type of binder used.

Place, publisher, year, edition, pages
De Gruyter Open, 2017
Keywords
foundry sand, hot distortion, moulding material, phenolic resin, thermal expansion
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-36936 (URN)10.1515/amm-2017-0118 (DOI)000406180900049 ()2-s2.0-85026783797 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2020-02-03Bibliographically approved
Svidró, J. T., Diószegi, A., Svidró, J. & Ferenczi, T. (2017). Thermophysical aspects of reclaimed moulding sand addition to the epoxy-SO2 coremaking system studied by Fourier thermal analysis. Journal of thermal analysis and calorimetry (Print), 130(3), 1779-1789
Open this publication in new window or tab >>Thermophysical aspects of reclaimed moulding sand addition to the epoxy-SO2 coremaking system studied by Fourier thermal analysis
2017 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 130, no 3, p. 1779-1789Article in journal (Refereed) Published
Abstract [en]

The most important advantage of foundry purpose moulding sand is that it can be reclaimed and reused through the casting manufacturing process. Supplying the foundry with a new source of material, sand reclamation brings along both environmental and economic advantages. Utilization of used sand can be considered as a common technological routine in the production of most types of chemically bound moulding materials. The epoxy-SO2 process is prevalent in the processing of cast iron engine components worldwide. Based on its excellent properties, it is mainly suitable for producing internal sand cores with complex geometry. Even though reclaimed sand addition is an active and well-functioning feature in ferrous foundries, the scientific and thermophysical background of its effects on the casting process is yet to be explored. In this work, the thermal aspects of different reclaimed sand levels in the epoxy-SO2 moulding system were examined. Thermogravimetry and differential thermal analysis of the epoxy-SO2 and reclaimed sand in focus were carried out to obtain basic understandings about their high-temperature behaviour. A state-of-the-art Fourier thermal analysis method presented in a recent paper was used at temperatures corresponding to actual cast iron production (1300 ± 10 °C), contrary to the previous tests at the typical temperature range of aluminium melt processing (660 ± 10 °C). By the right of the method, the effects of reclaimed sand addition on the heat absorption (cooling) capacity of the epoxy-SO2 moulding mixtures were investigated.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Cast iron; TG–DTA; Fourier thermal analysis; Epoxy resin; Heat absorption; Reclaimed foundry sand
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-37098 (URN)10.1007/s10973-017-6612-x (DOI)000415619800057 ()2-s2.0-85027969356 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2017-08-30 Created: 2017-08-30 Last updated: 2020-02-03
Tóth, J., Svidró, J. T., Diószegi, A. & Stevenson, D. (2016). Heat absorption capacity and binder degradation characteristics of 3D printed cores investigated by inverse fourier thermal analysis. International Journal of metalcasting, 10(3), 306-314
Open this publication in new window or tab >>Heat absorption capacity and binder degradation characteristics of 3D printed cores investigated by inverse fourier thermal analysis
2016 (English)In: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193, Vol. 10, no 3, p. 306-314Article in journal (Refereed) Published
Abstract [en]

The application of 3D printing techniques is a recently developing area used within foundry technology. Digital production of sand molds and cores eliminates the need for hard tooling, drastically reduces lead times and offers design freedoms not possible in the traditional pattern making. Even though mold and core making technologies are refined from both scientific and practical points of view, casting defects may still occur in the final products. Thus, molding material related casting research is required to generate state-of-the-art methods and understandings to avoid the formation of casting defects. In this paper, a pioneering method is presented which is suitable to determine novel thermophysical and heat transfer properties of various types of molding materials. These properties are strongly connected to the cooling capacity and the gas evolution features of the cores used in casting production. The method is based on temperature measurements inside spherical shaped core sand specimens and evaluated by a special application of Fourier thermal analysis. Temperature measurements were performed in test samples produced by two different 3D core printing systems. The registered temperature data were processed by Fourier thermal analysis to calculate the thermal properties and the decomposition characteristics of the 3D printed cores. The experiments were executed under different heating conditions analogous to aluminium and cast iron production.

Place, publisher, year, edition, pages
Springer, 2016
Keywords
3d printing, Aluminium, Cast iron, Casting defect, Core, Decomposition, Foundry, Molding material, Sand, Spherical, Temperature, Thermal analysis, Thermophysical, Aluminum, Coremaking, Defects, Foundries, Foundry sand, Fourier transforms, Heat transfer, Inverse problems, Iron, Molding, Molds, Printing, Temperature measurement, Thermoanalysis, 3-D printing, Molding materials, 3D printers
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-31242 (URN)10.1007/s40962-016-0043-5 (DOI)000381299400007 ()2-s2.0-84978042712 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2016-08-15 Created: 2016-08-15 Last updated: 2020-02-03Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3644-213X

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