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Wyszukujesz frazę "moulding sand destruction" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Kinetics of Gas Emission from Heated Moulding Sands Together with the On-line Assessment of H2 and O2 Fractions - New Investigation Method
    Autorzy:
    Mocek, J.
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379867.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas emission
    evolution rate
    hydrogen content
    oxygen content
    moulding sand
    resin
    burning
    moulding sand destruction
    emisja gazu
    tempo rozwoju
    zawartość wodoru
    zawartość tlenu
    masa formierska
    żywica
    spalanie
    Opis:
    The new investigation method of the kinetics of the gas emission from moulding sands used for moulds and cores is presented in this paper. The gas evolution rate is presented not only as a function of heating time but also as a function of instantaneous temperatures. In relation to the time and heating temperature the oxygen and hydrogen contents in evolving gases was also measured. This method was developed in the Laboratory of Foundry Moulds Technology, Faculty of Foundry Engineering, AGH. Gas amounts which are emitted from the moulding sand at the given temperature recalculated to the time unit (kinetics) are obtained in investigations. Results of investigations of moulding sand with furan resin are presented - as an example - in the paper.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Destruction Degree of the Quartz Matrix in the REGMAS Reclaimer
    Autorzy:
    Skrzyński, M.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381682.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reclamation
    moulding sand
    grain size analysis
    destruction
    rekultywacja
    masa formierska
    analiza uziarnienia
    Opis:
    The results of investigations of the influence of operation parameters of the prototype vibratory REGMAS reclaimer on matrix grains refinement (destruction) are presented in the paper. Fresh quartz sand ‘Szczakowa’ –1K 0.40/0.32/0.20, J88, >1400oC, WK= 1.20 was subjected to the treatment. Examinations were performed in three stages differing in the frequency of electrovibrators operations (which was: 40 Hz, 50 Hz and 60 Hz). For each frequency two settings of the exciting force of the rotodynamic drives were applied. They were equal 42% and 75% of the maximal exciting force. The sand batch placed in the bottom part of the REGMAS reclaimer was, in individual stages, subjected to elementary operations of grinding, rubbing and crushing. The destruction ratio was determined by means of the classic sieve analysis and grain size analysis performed in the Analysette 22NanoTec apparatus.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Reclamation Process Intensity in the REGMAS Reclaimer on the Purification Degree of the High-silica Matrix
    Autorzy:
    Skrzyński, M.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381684.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental protection
    reclamation
    moulding sand
    grain size analysis
    destruction
    ochrona środowiska
    regeneracja
    analiza wielkości ziarna
    zniszczenie
    Opis:
    The investigation results of the reclamation of spent moulding sands with furfuryl resin are presented in this paper. The reclamation process was performed in the secondary reclamation chamber of the REGMAS 1.5 vibratory reclaimer. 70 kg portions of moulding sands, previously subjected to the primary reclamation and dedusting, were used. The secondary reclamation was performed in two stages: the first consisted of determining the reclaimer intensity at various reclamation times (5 min, 10 min and 15 min) and various electrovibrator frequencies (40 Hz, 50 Hz and 60 Hz), the second consisted of determining the influence of additional crushing elements on the intensity of processes.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 69-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Content of Furfuryl Alcohol Monomer on the Process of Moulding Sands Thermal Destruction
    Wpływ zawartości monomeru alkoholu furfurylowego na proces destrukcji cieplnej mas formierskich
    Autorzy:
    Dobosz, S. M.
    Drożyński, D.
    Jakubski, J.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/354435.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    thermal destruction
    bending strength
    hot-distortion
    piasek formierski
    deformacja cieplna
    wytrzymałość na zginanie
    formowanie na gorąco
    Opis:
    The article discusses the issue of the influence of furfuryl alcohol content in resin binders on properties of moulding sand at elevated temperature. Reducing the share of this component - due to the requirements of the European Union regarding its toxicity - may cause a decrease in temperature of moulding sands’ destruction and, consequently, the thermal deformation of moulds and the creation of many casting defects. The study examined the impact of the furfuryl alcohol content of the thermal destruction processes and on the strength of the moulding sand at an ambient temperature and the tendency to thermal deformation.
    W artykule omówiono zagadnienie wpływu zawartości alkoholu furfurylowego w spoiwach żywicznych na właściwości mas formierskich w podwyższonej temperaturze. Zmniejszenie udziału tego składnika – spowodowane wymaganiami Unii Europejskiej odnośnie jego toksyczności – może powodować obniżenie temperatur destrukcji masy, a w konsekwencji deformację cieplną form i powstanie wielu wad odlewniczych. W pracy przebadano wpływ zawartości alkoholu furfurylowego na procesy cieplnej destrukcji spoiwa a także na wytrzymałość masy w temperaturze otoczenia oraz skłonność do deformacji cieplnej.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1093-1096
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Compositions: Biodegradable Material - Typical Resin, as Moulding Sands’ Binders
    Autorzy:
    Major-Gabryś, K.
    Dobosz, S. M.
    Drożyński, D.
    Jakubski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380803.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    binder
    biodegradable material
    foundry resin
    thermal destruction
    thermal deformation
    masa formierska
    spoiwo
    materiał biodegradowalny
    żywica formierska
    destrukcja termiczna
    odkształcenie termiczne
    Opis:
    The paper presents possibility of using biodegradable materials as parts of moulding sands’ binders based on commonly used in foundry practice resins. The authors focus on thermal destruction of binding materials and thermal deformation of moulding sands with tested materials. All the research is conducted for the biodegradable material and two typical resins separately. The point of the article is to show if tested materials are compatible from thermal destruction and thermal deformation points of view. It was proved that tested materials characterized with similar thermal destruction but thermal deformation of moulding sands with those binders was different.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 35-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State of Spent Molding Sands in the Mold Large-Size Cast
    Autorzy:
    Łucarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380064.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    organic binder
    thermal destruction
    ignition loss
    mechanical reclamation
    thermal reclamation
    masa formierska
    spoiwo organiczne
    deformacja cieplna
    strata prażenia
    regeneracja mechaniczna
    regeneracja termiczna
    Opis:
    The results of investigations of spent moulding sands taken from the mould at various distances from the surface of the produced casting, are presented in the paper. The casting mould was made with an application of the cooling system of the metal core in order to increase the cooling rate of the ladle casting. As temperature measurements in the mould indicated the heat flow from the metal did not create conditions for the complete burning of a moulding sand. The analysis was performed to find out changes of spent moulding sands caused by degradation and destruction processes of organic binders. Conditions occurring in the casting mould were discussed on the bases of testing: ignition losses, dusts contents, pH reactions and the surface morphology of the moulding sand samples. Factors limiting the effective mould degassing were pointed out. Operations, possible for realisation, which can limit the reasons of a periodical occurrence of increased amounts of casting defects due to changing gas evolution rates being the result of the technological process, were also indicated.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of Selecting the Reclamation Temperature of Spent Moulding Sands with Organic Binders
    Autorzy:
    Łucarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381377.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    thermal analysis
    organic binders
    thermal destruction
    thermal reclamation
    used molding sands
    zużyte masy formierskie
    analiza termiczna
    spoiwo organiczne
    zniszczenie termiczne
    regeneracja termiczna
    Opis:
    The thermal reclamation process as a utilisation method of spent moulding and core sands is more costly than other reclamation methods, but in the majority of cases it simultaneously provides the best cleaning of mineral matrices from organic binders. Thus, the application of the thermal analysis methods (TG-DSC), by determining the temperature range within which a degradation followed by a destruction of bounded organic binders in moulding sands, can contribute to the optimisation of the thermal reclamation process and to the limiting its realisation costs. The thermal analysis results of furan resin, one of the most often applied binder in foundry practice, are presented in the hereby paper. The influence of the heating rate of the sample - placed in the thermal analyser - on its degradation and destruction process under oxygen-free (argon) and oxygen (air) conditions, were compared. The recorded TG and DSC curves were used for analysing these processes as the temperature as well as the time function. The obtained results were analysed with regard to determining the required temperature of the thermal reclamation of the investigated organic binder. The usefulness of the developed methodology was found out, however under conditions of meeting several essential requirements concerning the repeatability of performed analyses.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 65-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions of Thermal Reclamation Process Realization on a Sample of Spent Moulding Sand from an Aluminum Alloy Foundry Plant
    Autorzy:
    Łucarz, M.
    Dereń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382337.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent moulding sand
    organic binders
    thermal destruction
    ignition loss
    mechanical reclamation
    thermal reclamation
    zużyte masy formierskie
    spoiwa organiczne
    zniszczenie termiczne
    straty prażenia
    regeneracja mechaniczna
    regeneracja termiczna
    Opis:
    The results of investigations of thermal reclamation of spent moulding sands originating from an aluminum alloy foundry plant are presented in this paper. Spent sands were crushed by using two methods. Mechanical fragmentation of spent sand chunks was realized in the vibratory reclaimer REGMAS. The crushing process in the mechanical device was performed either with or without additional crushing-grinding elements. The reclaimed material obtained in this way was subjected to thermal reclamations at two different temperatures. It was found that a significant binder gathering on grain surfaces favors its spontaneous burning, even in the case when a temperature lower than required for the efficient thermal reclamation of furan binders is applied in the thermal reclaimer. The burning process, initiated by gas burners in the reclaimer chamber, generates favorable conditions for self-burning (at a determined amount of organic binders on grain surfaces). This process is spontaneously sustained and decreases the demand for gas. However, due to the significant amount of binder, this process is longer than in the case of reclaiming moulding sand prepared with fresh components.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 197-201
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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