Temat: sand technologies - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Dielectric Properties of High-Silica Sand at 2.45 GHz
Autorzy:: Opyd, B
Nowak, D.
Granat, K.
Powiązania:: https://bibliotekanauki.pl/articles/382869.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
microwaves
moulding sand
high-silica sand
innowacyjne technologie odlewnicze
mikrofale
masa formierska
piasek kwarcowy
Opis:: In the paper, presented are measurements of permittivity (εr) and dielectric loss factor (tgδ) of high-silica moulding sand, determined at 2.45 GHz by perturbation method on a stand of waveguide resonance cavity. Determined were electrical properties of the main component of moulding sands, i.e. high-silica base, critical for their heating kinetics. The measurements were carried-out for six kinds of high-silica sand with diverse grain size distribution. Analysis of the results indicates that both permittivity and loss tangent values are similar for all kinds of high-silica moulding sand. Irrespective of their grain size analysis, neither of the examined sandmixes shows susceptibility to action of 2.45 GHz microwave field. The presented results make a ground for developing a mathematical model of microwave heating of technological systems composed of moulding sand and foundry tooling.
Źródło:: Archives of Foundry Engineering; 2015, 15, 1 spec.; 136-139
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Innovative microwave hardening of water-glass containing sandmixes in technical-economic approach
Autorzy:: Małachowska, A.
Stachowicz, M.
Granat, K.
Powiązania:: https://bibliotekanauki.pl/articles/382448.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne technologie odlewnicze
mikrofale
szkło wodne
masa formierska
masa rdzeniowa
innovative foundry technologies
microwave hardening
water glass
moulding sand
core sand
Opis:: In recent years, observed is increasing interest in sandmixes containing inorganic binders. These binders, including also water-glass, are harmless for the environment, neutral for humans and relatively cheap. In spite of numerous advantages, their wide application is restricted by poor knock-out properties and problems related to rebonding. Therefore, numerous researches aimed at eliminating disadvantages of water-glass binder are directed, among others, to modifying structure of hydrated sodium silicate or to applying new hardening techniques. The innovative method of rapid hardening by microwave heating, that permits restricting quantity of used binder and thus improving knock-out properties, meets expectations of present-day foundries. In this paper, compiled is available information on microwave hardening of water-glass containing sandmixes, as well as costs of practical application of this technology are evaluated on the ground of own research.
Źródło:: Archives of Foundry Engineering; 2012, 12, 1; 75-80
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of microwaves for binder content assessment in moulding sands
Autorzy:: Nowak, D.
Powiązania:: https://bibliotekanauki.pl/articles/380212.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne technologie odlewnicze
masa formierska
spoiwo
mikrofale
innovative foundry technologies
moulding sand
binder
microwaves
Opis:: The paper presents results of preliminary examinations on possibility of determining binder content in traditional moulding sands with the microwave method. The presented measurements were carried-out using a special stand, the so-called slot line. Binder content in the sandmix was determined by measurements of absorption damping Ad and insertion losses IL of electromagnetic wave. One of main advantages of the suggested new method of binder content measurement is short measuring time.
Źródło:: Archives of Foundry Engineering; 2012, 12, 3; 83-86
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: New look at the process of reclamation of moulding sands
Autorzy:: Dobosz, S. M.
Major-Gabryś, K.
Hosadyna, M.
Powiązania:: https://bibliotekanauki.pl/articles/380262.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
masa formierska
innovative foundry materials
innovative foundry technologies
moulding sand
reclaim
ester hardener
Opis:: This paper presents a new perspective on the issue of reclamation of moulding and core sands. Taking as a premise that the reclamation process must remain on the surface of grains some not separated binding materials rests, it should be chosen the proper moulding sand's composition that will be least harmful for the reclaim quality. There are two different moulding and core sands taken into examinations. The researches prove that a small correction of their compositions (hardener type) improves the quality of the received reclaims. Carried out in this article studies have shown that such an approach to the problem of reclamation of the moulding and core sands is needed and reasonable.
Źródło:: Archives of Foundry Engineering; 2012, 12, 3; 19-24
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The Influence of Microwave Drying Parameters on the Properties of Synthetic Moulding Sands
Autorzy:: Nowak, D.
Gal, B.
Włodarska, A.
Granat, K.
Powiązania:: https://bibliotekanauki.pl/articles/381434.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
drying
moulding sand
strength properties
permeability
innowacyjne technologie odlewnicze
suszenie mikrofalowe
piasek formierski
właściwości wytrzymałościowe
przepuszczalność
Opis:: In this work, the influence of microwave drying parameters such as irradiation time and microwave power level on the properties of synthetic moulding sands is presented. Determination of compressive strength Rcs, shear strength Rts and permeability Ps of synthetic moulding sands with the addition of two different bentonites, after drying process with variable microwave parameters were made. The research works were carried out using the microwave oven with regulated power range of the electromagnetic field. From the results obtained, the significant influence of both drying time and microwave power level on the selected properties of moulding sands was observed. In comparison to the conventional drying method, microwave drying allows to obtain higher compressive strength of the synthetic moulding sand. The influence of application microwave irradiation on permeability was not observed. Higher strength characteristics and shorter drying time are major advantages of application of the electromagnetic irradiation for drying of the synthetic moulding sand with regard to conventional drying method.
Źródło:: Archives of Foundry Engineering; 2019, 4; 51-54
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Tendency of Moulding Sands to Generate Core Cracks
Autorzy:: Grabarczyk, A.
Dobosz, S. M.
Kusiński, J.
Major-Gabryś, K.
Powiązania:: https://bibliotekanauki.pl/articles/380432.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative foundry materials
moulding sand
binder
elasticity
cracking
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
masa formierska
spoiwo
Opis:: The constant growth of foundry modernization, mechanization and automation is followed with growing requirements for the quality and parameters of both moulding and core sands. Due to this changes it is necessary to widen the requirements for the parameters used for their quality evaluation by widening the testing of the moulding and core sands with the measurement of their resistance to mechanical deformation (further called elasticity). Following article covers measurements of this parameter in chosen moulding and core sands with different types of binders. It focuses on the differences in elasticity, bending strength and type of bond destruction (adhesive/cohesive) between different mixtures, and its connection to the applied bonding agent. Moulding and cores sands on which the most focus is placed on are primarily the self-hardening moulding sands with organic and inorganic binders, belonging to the group of universal applications (used as both moulding and core sands) and mixtures used in cold-box technology.
Źródło:: Archives of Foundry Engineering; 2018, 18, 1; 157-161
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Elasticity of Moulding Sands – a Method of Reducing Core Cracking
Autorzy:: Dobosz, S. M.
Grabarczyk, A.
Major-Gabryś, K.
Powiązania:: https://bibliotekanauki.pl/articles/380966.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative foundry materials
moulding sand
binder
elasticity
cracking
innowacyjne technologie odlewnicze
innowacyjne materiały
piasek formierski
spoiwo
elastyczność
Opis:: This paper focuses on mechanical properties of self hardening moulding sands with furfuryl and alkyd binders. Elasticity as a new parameter of moulding sands is investigated. With the use of presented testing equipment it is possible to determine force kinetics and deformation of moulding sand in real time. The need for this kind of study comes from the modern casting industry. New foundries can be characterized with high intensity of production which is correlated with high level of mechanization and automatization of foundry processes. The increasingly common use of manipulators in production of moulds and cores can lead to generation of new types of flaws, caused by breakage in moulds and cores which could occur during mould assembly. Hence it is required that moulds and cores have high resistance to those kinds of factors, attributing it with the phenomenon of elasticity. The article describes the theoretical basis of this property, presents methods of measuring and continues earlier research.
Źródło:: Archives of Foundry Engineering; 2017, 17, 1; 31-36
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Research on Assessment of the Applicability of Malted Barley Binder in Moulding Sand Technology
Autorzy:: Samociuk, B.
Gal, B.
Nowak, D.
Powiązania:: https://bibliotekanauki.pl/articles/2079587.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative materials
mechanical properties
moulding sand
organic binder
innowacyjne technologie odlewnicze
innowacyjne materiały
właściwości mechaniczne
masa formierska
spoiwo organiczne
Opis:: The foundry industry is looking for solutions that improve the quality of the finished product and solutions that reduce the negative impact of the industry on the natural environment [26]. This process leads to work on the use of new or previously unused materials for binders. Organic and inorganic foundry binders are replaced by renewable materials of plant origin to meet the requirements of both the foundry customers and the environmental and health and safety regulations. The aim of this work was to identify the applicability of renewable and organic malted barley binder in moulding sand technology. The influence of the malt binder content on dry tensile strength, dry bending strength, dry permeability, dry wear resistance and flowability were evaluated. The results show that the malted barley binder can be self contained material binding the high-silica sand grains. Selected mechanical properties of moulding sands were found to increase with an increase in binder content. It was observed that malted barley binder creates smooth bonding bridges between high-silica sand grains.
Źródło:: Archives of Foundry Engineering; 2021, 21, 1; 74-80
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Studies on the renewability of polymeric binders for foundry
Autorzy:: Grabowska, B.
Kaczmarska, K.
Bobrowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/380277.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
masa formierska
spoiwo polimerowe
sieciowanie
innovative foundry materials
innovative foundry technologies
moulding sand
polymeric binders
crosslinking
renewability
Opis:: In this paper the results of studies of polymeric binders on the example of the new BioCo2 binder, including the problem of its renewability, are presented. The results of structural studies (FT-IR) for the BioCo2 binder before and after crosslinking, and bending strength tests Rgu fresh and renewed cured molding sands with BioCo2 binder are discussed. The cross-linking binder and curring of moulding sand was carried out by physical agents (microwave radiation, temperature). On the basis of obtained results was shown that it is possible to restore the initial properties of the adhesive of BioCo2 binder. The initial properties of moulding sand can be achieved, after the cross-linking binders and after curing in the moulding sands with bioCo2 binder , by supplementing the moulding sand composition by the appropriate amount of water.
Źródło:: Archives of Foundry Engineering; 2012, 12, 3; 37-42
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The Influence of Various Matrixes on the Strength Properties of Moulding Sands with Thermally Hardened Hydrated Sodium Silicate for the Ablation Casting Process
Autorzy:: Major-Gabryś, Katarzyna
Puzio, Sabina
Bryłka, Agata
Kamińska, Jadwiga
Powiązania:: https://bibliotekanauki.pl/articles/2056023.pdf
Data publikacji:: 2021
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: innovative foundry technologies and materials
moulding sand
ablation casting
water glass
thermal curing
innowacyjne technologie
materiały odlewnicze
piasek formierski
odlewanie ablacyjne
szkło wodne
utwardzanie termiczne
Opis:: The essence of ablation casting technology consists in pouring castings into single-use moulds made from the mixture of sand and a water-soluble binder. After pouring the mould with liquid metal yet while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in ablation casting. The research is based on the use of water glass 145 and 150 as binders. As part of the research, loose moulding mixtures based on two silica sands from different sand mines with different content of binders were prepared. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Our own research also confirmed the possibility of using these sand mixtures in terms of both casting surface quality and sand reclamation. The results presented in this paper prove that both sand grains and types of binder tested may be used as components in moulding sands devoted to ablation casting.
Źródło:: Journal of Casting & Materials Engineering; 2021, 5, 2; 31--35
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Studies of Binding Kinetics and Choice of Self-Hardening Moulding and Core Sands Used for Casting Massive Parts for Wind Power Industry under the Conditions of Krakodlew Foundry
Autorzy:: Rączka, M.
Isendorf, B.
Powiązania:: https://bibliotekanauki.pl/articles/382470.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: wind energy
innovative materials
innovative casting technologies
environmental protection
ductile iron
moulding sand
energia wiatrowa
innowacyjne materiały
innowacyjna technologia odlewania
ochrona środowiska
żeliwo
masy formierskie
Opis:: In highly developed countries, a significant progress in the use of alternative and clean energy sources has recently been observed. The European Union has implemented a programme to build wind turbines. It is estimated that in the coming years, thanks to the support in tax and credit, the global energy will develop very intensively. Many components of the wind turbines are castings. The basic material used for these castings is ductile iron, which in this particular case must meet high requirements imposed by the operating conditions of wind turbines. Anticipating an increase in customer demand for this type of castings, Krakodlew SA has decided to modernize its foundry using the ability to obtain external financing. The ductile iron manufacturing technology is now being developed and adapted to the specific conditions of the foundry plant, including the melting process yielding cast material with the required chemical composition, the technology of moulding, and the conditions for possible secondary metallurgy, spheroidizing treatment and graphitizing inoculation. The fulfilment of the imposed conditions for the casting production demands the use of advanced casting technologies introduced to the manufacturing process. The development of technology to launch the production of ductile iron castings for the wind power industry was supported by The National Centre for Research and Development (NCBiR). This article presents part of research on the binding kinetics of furan resin sands and choice of their composition for moulds and cores to make heavy castings used as components of equipment for the wind power industry.
Źródło:: Archives of Foundry Engineering; 2017, 17, 2; 222-226
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Thermally Hardened Moulding and Core Sands with Hydrated Sodium Silicate Designed for Al Alloy Castings
Autorzy:: Major-Gabryś, K. A.
Grabarczyk, A. P.
Dobosz, S. M.
Powiązania:: https://bibliotekanauki.pl/articles/379661.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative foundry materials
moulding sand
hydrated sodium silicate
thermal hardening
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
masa formierskia
krzemian sodu
hartowanie termiczne
Opis:: The necessity of obtaining high quality castings forces both researchers and producers to undertake research in the field of moulding sands. The key is to obtain moulding and core sands which will ensure relevant technological parameters along with high environmental standards. The most important group in this research constitutes of moulding sands with hydrated sodium silicate. The aim of the article is to propose optimized parameters of hardening process of moulding sands with hydrated sodium silicate prepared in warm-box technology. This work focuses on mechanical and thermal deformation of moulding sands with hydrated sodium silicate and inorganic additives prepared in warm-box technology. Tested moulding sands were hardened in the temperature of 140ºC for different time periods. Bending strength, thermal deformation and thermal degradation was tested. Chosen parameters were tested immediately after hardening and after 1h of cooling. Conducted research proved that it is possible to eliminate inorganic additives from moulding sands compositions. Moulding sands without additives have good enough strength properties and their economic and ecological character is improved.
Źródło:: Archives of Foundry Engineering; 2018, 18, 3; 132-137
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Moulding sands with new inorganic binders - ecology assessment in the aspect of work environment
Autorzy:: Szanda, I.
Żmudzińska, M.
Faber, J.
Perszewska, K.
Powiązania:: https://bibliotekanauki.pl/articles/380365.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
odlewnictwo
masa formierska
spoiwo nieorganiczne
środowisko pracy
innovative foundry materials
innovative foundry technologies
casting
moulding sand
inorganic binders
work environment
Opis:: The development of economy and industry introducing new technologies and materials often means the increased threat of occurrence of factors harmful to humans and environment. Workers employed in foundries as mould pourers are the group of high professional risk. Foundry moulding sands when poured with liquid metal are a source of the emission of harmful, toxic and carcinogenic (benzene, PAHs) compounds. The paper presents the results of studies on the concentration of chemical compounds emitted in the process of casting aluminium alloy and brass using moulding sands with the new inorganic binders. The specific values of the exposure indices were compared with the limit values. This enabled an assessment of the impact of moulding sands on work environment. The obtained results were compared with the values of contaminants emitted when pouring foundry moulds made from furan sands and bentonite sands with an addition of coal dust.
Źródło:: Archives of Foundry Engineering; 2012, 12, 3; 117-122
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Organic Moulding Sands for Production of Large-Size Castings
Autorzy:: Major-Gabryś, K.
Hosadyna-Kondracka, M.
Powiązania:: https://bibliotekanauki.pl/articles/382360.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative materials
moulding sand
organic binder
furfuryl resin
hardener
alkyd resin
alphaset process
innowacyjne technologie odlewnicze
materiały innowacyjne
piasek formierski
spoiwo organiczne
żywica furfurylowa
utwardzacz
żywica alkidowa
Opis:: Recently, some major changes have occurred in the structure of the European foundry industry, such as a rapid development in the production of castings from compacted graphite iron and light alloys at the expense of limiting the production of steel castings. This created a significant gap in the production of heavy steel castings (exceeding the weight of 30 Mg) for the metallurgical, cement and energy industries. The problem is proper moulding technology for such heavy castings, whose solidification and cooling time may take even several days, exposing the moulding material to a long-term thermal and mechanical load. Owing to their technological properties, sands with organic binders (synthetic resins) are the compositions used most often in industrial practice. Their main advantages include high strength, good collapsibility and knocking out properties, as well as easy mechanical reclamation. The main disadvantage of these sands is their harmful effect on the environment, manifesting itself at various stages of the casting process, especially during mould pouring. This is why new solutions are sought for sands based on organic binders to ensure their high technological properties but at the same time less harmfulness for the environment. This paper discusses the possibility of reducing the harmful effect of sands with furfuryl binders owing to the use of resins with reduced content of free furfuryl alcohol and hardeners with reduced sulphur content. The use of alkyd binder as an alternative to furfuryl binder has also been proposed and possible application of phenol-formaldehyde resins was considered.
Źródło:: Archives of Foundry Engineering; 2019, 3; 99-105
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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