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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect of Mechanical Reclamation Cycle on Strength Parameters of Loose Self-Hardening Sands Based on Furfuryl Resin
    Autorzy:
    Kamińska, J.
    Basińska, E.
    Angrecki, M.
    Palma, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353768.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loose self-hardening sand
    furfuryl resin
    mechanical reclamation
    Opis:
    The results of mechanical reclamation of waste moulding sands with furfuryl resin and activators of new generation are presented. The aim of the research described in this study was to determine what effect the addition of reclaim obtained in the process of dry mechanical reclamation could have on the properties of furan sands. The sand supplied by one of the domestic foundries was after the initial reclamation subjected to a two-step proper reclamation process. The following tests were carried out on the obtained reclaim: pH, S and N content, loss on ignition and comprehensive sieve analysis. The obtained reclaim was next used as a component of moulding sands with furfuryl resin, wherein it formed 50% and 80% of the base moulding material, respectively. The strength properties of the ready sand mixtures (bending strength Rgu and tensile strength Rm u ) were determined after the hardening time of 0.5, 1, 2, 4 and 24 hours.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1843-1846
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Tests of Innovative Eco-Friendly Furfuryl Resins and Foundry Sand Mixtures Based on These Resins
    Autorzy:
    Kamińska, Jadwiga
    Puzio, Sabina
    Angrecki, Michał
    Stachowicz, Mateusz
    Łoś, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/123922.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    loose self-hardening sand
    furfuryl resin
    environmental protection
    mechanical tests
    casting surface quality
    Opis:
    The foundry industry in Poland and EU member states is growing steadily. The alloys based on ferrous metals (cast steel and cast iron) largely contribute to this upward trend. Currently, foundries are facing the problem of increasing requirements, which enforce the production of castings characterized by high dimensional accuracy and surface smoothness with parallel elimination of casting defects. Castings are mostly made in moulding sand mixtures, which are also subject to more and more stringent requirements to meet the above-mentioned casting acceptance conditions. Additionally, moulding sands should ensure adequate mould stiffness to avoid the risk of dimensional deformations during the pouring of liquid metal to this mould and casting solidification. For these reasons, the production of this type of castings has been dominated by loose self-hardening sands with furfuryl resin, commonly called furan sands. In the group of self-hardening sands with synthetic resins, loose self-hardening sands with furfuryl resin enjoy the greatest popularity. What accounts for this fact is the high level of the reclamability of these sands, the possibility of obtaining castings with high dimensional accuracy, the ability to make intricate moulds and cores, the binding process taking place at ambient temperature, and low content of binder. Unfortunately, this technology also has some disadvantages, which include short lifetime of the sand mixture, harmful gases emitted from the sand, and currently also high cost of the sand mixture. The anticipated tightening of the environmental protection regulations in the EU countries, including limiting the content of free furfuryl alcohol in resins (<25% by mass) and reducing the emission of furfuryl alcohol, formaldehyde and BTEX compounds at workplaces, necessitated the development of a new generation of furfuryl resins friendly to the environment. The article compares the results of testing the strength properties of foundry moulding sands using two types of resins, i.e. the resin of a new generation synthesized by Grupa Azoty JRCh and a commercial resin used in the foundry industry. Additionally, derivatographic studies of the above mentioned sand mixtures were conducted, and the loss on ignition and the amount of gases emitted by the sand mixture were determined. Melting was also carried out to study the impact of the resin used on the surface quality of iron castings.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 285-292
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Reclaim Addition on the Mechanical and Technological Properties of Moulding Sands Based on Pro-Ecological Furfuryl Resin
    Autorzy:
    Kamińska, J.
    Puzio, S.
    Angrecki, M.
    Łoś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354386.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loose self-hardening sand
    pro-ecological furfuryl resin
    environmental protection
    strength tests
    gas-forming tendency
    Opis:
    Increasing demands are imposed on foundries to enforce the manufacture of castings characterized by tight dimensional tolerances, high surface finish and total absence of casting defects. To face these challenges, castings are increasingly made in loose self-hardening sands with furfuryl resin, commonly known as furan sands. In the group of self-hardening sands with synthetic resins, loose self-hardening sands with furfuryl resin enjoy the greatest popularity. The sand mixtures based on furan resins are usually subjected to mechanical reclamation. The consumption of binder and hardener and thus the cost of the sand depend on the quality of reclaim, and mainly on the dust removal degree.The planned tightening of the environmental protection regulations in the EU countries, including limiting the content of free furfuryl alcohol in resins and reducing the emission of furfuryl alcohol, formaldehyde and BTEX compounds at workplaces, necessitated the development of a new generation of eco-friendly furfuryl resins that have recently appeared on the market. The main aim of this article was to determine the effect of reclaim content on the sand parameters, such as bending strength, tensile strength, bench life, gas-forming tendency and loss on ignition. Tests were carried out with reclaim content in the sand mixture varying from 50 to 90%. The reclaim obtained by dry mechanical reclamation was supplied by one of the domestic foundries. The results showed that the highest mechanical properties were obtained in sands containing 60% of the reclaim.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1425-1429
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the Glassex additive on technological and knock--out properties of the moulding sands with hydrated sodium silicate and new ester hardeners
    Wpływ dodatku Glassex na właściwości technologiczne i wybijalność mas z uwodnionym krzemianem sodu i nowymi utwardzaczami estrowymi
    Autorzy:
    Major-Gabryś, K.
    Dobosz, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/263880.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    samoutwardzalna masa formierska
    szkło wodne
    wybijalność
    self-hardening moulding sand
    water glass
    Opis:
    The article takes into consideration the researches concerning inserting the Glassex additive to the moulding sands with water glass and the new ester hardeners. The investigations combine the works connected to the Glassex additive influence on the moulding sand's with water glass knock-out properties and the works connected to the elaboration of the new ester hardeners upgrading of ability to mechanical reclamation of the moulding sand with water glass.
    Artykuł omawia badania dotyczące wprowadzenia do mas formierskich ze szkłem wodnym dodatku Glassex oraz zastosowania nowych utwardzaczy estrowych. Przedstawione badania łączą prace autorów dotyczące określenia wpływu dodatku Glassex na wybijalność mas ze szkłem wodnym z pracami dotyczącymi wpływu nowych utwardzaczy estrowych na zdolność do regeneracji tych mas.
    Źródło:
    Metallurgy and Foundry Engineering; 2011, 37, 1; 33-40
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the influence of the matrix recycling on properties of the moulding sand with Geopol 618 binder
    Autorzy:
    Kamińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380390.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    self hardening moulding sand
    reclamation
    environment protection
    masa samoutwardzalna
    regeneracja
    ochrona środowiska
    Opis:
    Self-hardening moulding sands with water-glass hardened by liquid esters are applied in several foundry plants for making moulds for the production of heavy iron and steel castings. The main good point of this process is a low cost of sands. However, on account of a low susceptibility of this moulding sand for the matrix reclamation the fraction of sands originated from the reclamation is limited. The investigations presented in this work were aimed at the determination of the addition of the reclaimed material, obtained in the dry mechanical reclamation, on properties of the moulding sand with the Geopol 618 binder, which is water-glass modified by polymers and hardened by esters.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 69-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Phosphate Binder for Ablation Casting of AlSi7Mg Modified TiB Alloy
    Autorzy:
    Puzio, Sabina
    Kamińska, J.
    Major-Gabryś, K.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126893.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ablation casting technology
    alumina
    phosphate binder
    self-hardening sand
    inorganic binder
    odlewanie ablacyjne
    tlenek glinu
    spoiwo fosforanowe
    piaski samoutwardzalne
    spoiwo nieorganiczne
    Opis:
    The possibilities of using an inorganic phosphate binder for the ablation casting technology are discussed in this paper. This kind of binder was selected for the process due to its inorganic character and water-solubility. Test castings were made in the sand mixture containing this binder. Each time during the pouring liquid alloy into the molds and solidification process of castings, the temperature in the mold was examined. Then the properties of the obtained castings were compared to the properties of the castings solidifying at ambient temperature in similar sand and metal molds. Post-process materials were also examined - quartz matrix and water. It has been demonstrated that ablation casting technology promotes refining of the microstructure, and thus upgrades the mechanical properties of castings (Rm was raised about approx. 20%). Properties of these castings are comparable to the castings poured in metal moulds. However, the post-process water does not meet the requirements of ecology, which significantly reduces the possibility of its cheap disposal.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 62--68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Properties of Microwave-Hardened Sandmixes Containing Water-Glass with Use of Neural Networks
    Autorzy:
    Stachowicz, M.
    Pałyga, Ł.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382728.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    artificial neural network
    loose self-hardening sand
    moulding sand
    water glass
    microwave
    odlewnictwo
    sztuczna sieć neuronowa
    sypka masa samoutwardzalna
    masa formierska
    szkło wodne
    mikrofala
    Opis:
    Presented are results of a research on the possibility of using artificial neural networks for forecasting mechanical and technological parameters of moulding sands containing water-glass, hardened in the innovative microwave heating process. Trial predictions were confronted with experimental results of examining sandmixes prepared on the base of high-silica sand, containing various grades of sodium water-glass and additions of a wetting agent. It was found on the grounds of obtained values of tensile strength and permeability that, with use of artificial neural networks, it is possible complex forecasting mechanical and technological properties of these materials after microwave heating and the obtained data will be used in further research works on application of modern analytic methods for designing production technology of high-quality casting cores and moulds.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 99-104
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Granulation of after reclamation dusts from the mixed sands technology: water glass – resolit
    Granulacja pyłów poregeneracyjnych z technologii mas mieszanych: szkło wodne – rezolit
    Autorzy:
    Kamińska, J.
    Dańko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380047.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental protection
    loose self-hardening sand
    Floster S process
    after reclamation dust
    granulation
    ochrona środowiska
    sypka masa samoutwardzalna
    proces Floster S
    pył poregeneracyjny
    granulacja
    Opis:
    A technology of sands with water glass hardened by liquid esters is a cheap and ecologic method of producing moulding sands. Due to these advantages, this technology is still very important in several foundry plants for production of heavy iron and steel castings. Reclamation of the mixed moulding and core sands generates significant amounts of dusts, which require further treatments for their reuse. The results of investigations of a pressureless granulation of dusts generated in the dry mechanical reclamation process of the mixture consisting in app. 90% of moulding sands from the Floster S technology and in 10% of core sands with phenolic resin resol type, are presented in the hereby paper. Investigations were aimed at obtaining granulates of the determined dimensional and strength parameters. Granules were formed from the mixture of dusts consisting of 75 mass% of dusts after the reclamation of sands mixture and of 25 mass% of dusts from bentonite sands processing plant. Wetted dusts from bentonite sands were used as a binding agent allowing the granulation of after reclamation dusts originated from the mixed sands technology.
    Technologia mas ze szkłem wodnym utwardzanym ciekłymi estrami jest tanią i bardzo ekologiczną metoda wytwarzania mas formierskich. Z uwagi na te zalety technologia ta ma nadal duże znaczenie w wielu odlewniach do wykonywania form dla produkcji ciężkich odlewów żeliwnych i staliwnych. Regeneracja mieszaniny masy formierskiej oraz mas rdzeniowych tworzy znaczne ilości pyłów poregeneracyjnych, które wymagają dalszej obróbki w celu ponownego ich zagospodarowania. W pracy przedstawiono wyniki badań procesu bezciśnieniowej granulacji pyłów generowanych w procesie suchej regeneracji mechanicznej mieszaniny mas zużytych składających się w około 90% z masy formierskiej z technologii Floster S oraz 10% z masy rdzeniowej z żywicą fenolową typu rezolowego. Badania miały na celu wytworzenie granulatu o określonych parametrach wymiarowych i wytrzymałościowych. Granule tworzono z mieszaniny pyłów składającej się w 75% mas. z pyłów uzyskanych po regeneracji mieszaniny mas oraz w 25% mas. z pyłów z masy z bentonitem. Nawilżony pył z masy bentonitowej został użyty jako spoiwo umożliwiające granulowanie się pyłów poregeneracyjnych z technologii mas mieszanych.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 65-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Reclaim Primary Quality on Moulding Sand Parameters and Quality of Ductile Iron Casting Surface Layer
    Autorzy:
    Kamińska, Jadwiga
    Angrecki, M.
    Puzio, S.
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134210.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    furfuryl resin
    reclaim
    self-hardening moulding sand
    surface quality
    ductile iron
    przemysł odlewniczy
    żywica furfurylowa
    masa formierska
    masa samoutwardzalna
    jakość powierzchni
    odlew z żeliwa sferoidalnego
    Opis:
    The aim of the research was to determine the effect of the primary quality of reclaim from dry mechanical reclamation on the strength properties and service life of moulding sands based on this reclaim. Another aim was to establish the effect of the quality of reclaim, sulphur content - in particular, on the surface quality and thickness of the deformed surface layer in ductile iron castings. The research has revealed differences in the strength parameters and service life (mouldability) of sands based on the tested reclaims, depending on the type of the furfuryl resin used, including resins whose synthesis was done as part of the Żywfur project. Examinations of the structure of the surface layer of test castings poured in moulds made of loose self-hardening sands containing the addition of reclaim have confirmed the occurrence of degenerated spheroidal graphite in this part of the casting. It should be noted here that when massive castings with a long solidification time are made, the graphite degeneration effect can be more visible and the layer with the changed structure can increase in thickness. The research has clearly shown that it is necessary to control the parameters of the reclaim, including sulphur content which is transferred from the hardener and accumulates on the grains. This phenomenon has a negative impact not only on the sand strength and technological properties but also on the surface layer of castings.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 83--88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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