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    Wyświetlanie 1-9 z 9
    Tytuł:
    Determination of the Surface and Volume Porosity, on the Basis of the Main Fraction of the Polifractional Matrix of Moulding and Core Sands
    Autorzy:
    Dańko, R.
    Dańko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382925.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sand grain
    volume porosity
    moulding sand
    ziarna piasku
    porowatość objętościowa
    masa formierska
    Opis:
    The aim of the hereby paper is to present the developed model of determining the volume and surface porosity based on the main fraction of polifractional materials, its experimental verification and utilisation for the interpretation of effects accompanying the formation of a moulding sand apparent density, porosity and permeability in the blowing processes of the core and moulds technology.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 191-195
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Sand Grains Properties on Electrical Properties of Moulding Sand with Inorganic Binder
    Autorzy:
    Opyd, B.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381698.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    microwaves
    moulding sand
    sand grain
    water glass
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    mikrofale
    masa formierska
    osnowa piaskowa
    szkło wodne
    Opis:
    The paper presents the results of basic research on the influence of the properties of sand grains on electrical properties of water glass moulding sands. It shows electrical properties of the main component – sand grains, crucial to the kinetics of moulding sands heating, such as permittivity εr and loss factor tgδ. Measurements were carried out with the use of the perturbation method for silica, chromite and olivine sands of different mineral, chemical composition and particle size distribution, as well as for moulding sands with water glass grade 145. Analysis of the results of measurements of electrical properties shows that all moulding sands are characterized by a similar permittivity εr and loss factor tgδ. It was found that the electrical properties and the quantity and quality of other components may have a decisive influence on the effectiveness and efficiency of the microwave heating of moulding sands with sand grains. In determining the ability to efficiently absorb the microwave radiation for mixtures which moulding sands are, the impact of all components influencing their individual technological parameters should be taken into account.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 43-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on the Effect of Granulometric Features on the Permeability of No-Bake Resin Bonded Sand Cores
    Autorzy:
    Hudák, H.
    Gyarmati, G.
    Varga, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837703.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry sand
    granulometric features
    grain size
    grain morphology
    grain shape
    permeability
    Opis:
    Foundry sand is the main element of sand mixtures from which molds or sand cores are made. Due to the continuous development of core making technologies, the selection of the right type of base sand becomes more and more important. The major features of foundry sand are determined by the following factors: chemical and mineralogical composition, sand grain size, grain size distribution, sand grain shape, and surface quality. The main goal of our research was to develop a qualification method that can be used to predict the characteristics of sand cores made from different sand types. Samples made from different types of foundry sand were used during the research whose properties were examined with a new qualification system, and then its connection with the gas permeability of sand cores was analyzed. Based on the research results, a strong correlation could be established between the suggested quality indicators: CQi (Core Quality Index), CG (Coefficient of Granulometry), and permeability.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 99-105
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie skuteczności klasyfikacji w oparciu o wykorzystanie metody laserowego pomiaru wielkości ziaren
    Investigations of the effectiveness of the classification based on the laser method of the grain size estimation
    Autorzy:
    Holtzer, M.
    Dańko, R.
    Skrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380400.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    regeneracja masy formierskiej
    masa zużyta
    analiza ziarnowa
    dyfrakcja laserowa
    moulding sand
    sand reclamation
    used sand
    grain analysis
    laser diffraction
    Opis:
    Analiza granulometryczna jest istotnym parametrem, za pomocą którego ocenia się prawidłowość przebiegu wielu procesów przeróbczych a jej wyniki stanowią istotny element oceny i optymalizacji parametrów pracy tego typu urządzeń. Z tego powodu bardzo istotne jest stosowanie najbardziej precyzyjnych sposobów oceny składu granulometrycznego materiałów polidyspersyjnych, zgodnie z najnowszymi osiągnięciami techniki pomiarowej w tym zakresie. Najnowszymi urządzeniami do pomiaru wielkości cząstek są urządzenia wykorzystujące zjawisko dyfrakcji laserowej. W artykule przedstawiono badania skuteczności klasyfikacji w oparciu o wykorzystanie metody laserowego pomiaru wielkości ziaren. W ramach badań przeprowadzono badania skuteczności klasyfikacji w urządzeniu kaskadowym regeneratu po regeneracji masy zużytej z żywicą furfurylową FR 75 A. W wyniku badań stwierdzono, że przy wydajnościach podawania nadawy w zakresie 0,5-1,0 Mg/h przy prędkości powietrza ok. 1 m/s następuje oddzielenie z zapylonej masy 80-85% pyłów i frakcji o prześwicie poniżej sita 0,1 mm, a niekiedy poniżej sita 0,16 mm.
    A grain size analysis is an essential parameter, by means of which the correctness of several treatment processes is estimated, and its results constitute an essential element of assessment and optimization of operational parameters of this type of devices. Due to that, it is very important to apply the most accurate ways of assessing the grain size composition of polydispersive materials - in accordance with the newest achievements of the measuring technique. The most advanced devices for grain size measurements are the ones utilising the laser diffraction effect. The investigations of the effectiveness of the classification performed on the basis of the laser method of grain size measurements are presented in the paper. The effectiveness of the classification of the reclaimed spent sand with the FR 75 A furfuryl resin in the cascade device was checked. It was found that at the feed material supply being in the range: 0.5-1.0 Mg/h, at the air velocity app. 1 m/s the separation of 80-85% of dusts and fractions, of a clearance below 0.1 mm sieve and sometimes below 0.16 mm sieve, occurs.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 63-68
    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:
    The Research on Characterization of Crushability for Foundry Sand Particles
    Autorzy:
    Dai, Y.
    Ma, Q. Y.
    Li, X. H.
    Zhang, X.
    Hu, F. P.
    Zhang, Y.
    Xie, W. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/379689.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry sand particle
    mechanical load
    AFS grain fineness
    crushability
    piasek odlewniczy
    obciążenie mechaniczne
    rozdrobnienie ziarna
    Opis:
    In this paper, crushability of foundry sand particles was studied. Three kinds of in-service silica sands in foundry enterprises selected as the study object, and foundry sand particles were subjected to mechanical load and thermal load during service were analyzed. A set of methods for simulating mechanical load and thermal load by milling and thermal-cold cycling were designed and researched, which were used to characterize the crushability for silica sand particles, the microstructure was observed by SEM. According to the user’s experience in actual application, the crushability of Sand C was the best and then Sand B, the last Sand A. The results indicated that mechanical load, thermal load and thermal-mechanical load can all be used to characterize the crushability of foundry sand particles. Microscopic appearances can qualitatively characterize the crushability of foundry sand particles to a certain extent, combining with the additions and cracks which are observed on the surface.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 231-235
    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:
    Evaluation of Foundry Properties of Brahmaputra River Sand and its Prospects
    Autorzy:
    Rana, Md. Shohel
    Shahriar, Md. Shams
    Alam, Md. Sha
    Hossain, Md. Imam Sohel
    Biswas, Pradip Kumar
    Zaman, Mohammad Nazin
    Powiązania:
    https://bibliotekanauki.pl/articles/27314157.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    foundry properties
    grain fineness number
    green strength
    metal casting
    river sand
    właściwości odlewnicze
    rozdrobnienie ziarna
    odlew metalowy
    piasek rzeczny
    Opis:
    The river system of the Bengal delta encompasses a huge amount of fluvial sand; however, no comprehensive studies were available on using this river sand in foundry industries. Hence, the present research evaluates the foundry properties of trans-boundary Brahmaputra River sand and its prospects for use in foundries. Several laboratory analyses have been performed to elicit the foundry properties using standard methods of foundry analysis, including XRD, XRF, TG-DSC, and FESEM. From the study, the sand contains mainly quartz with small amounts of feldspar, amphibole, chlorite, and mica, and exhibits a subangular to subrounded shape. The sand is dominated by SiO2 (67.81-69.97%) and lesser amounts of other oxides, and it is thermally stable within 1000 °C temperature. The grain fineness number (64-79), mineralogical, chemical, thermal, and foundry properties are suitable for non-ferrous metal casting without distortion. Further, the aluminum and zinc alloy casting with trials demonstrate their potential for use in the foundry industries. The outcomes of this study thus offer valuable information about utilizing Brahmaputra River sand for foundry applications.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 80--90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasound Wave Attenuation of Grain Refined High – Zinc Aluminium Sand-cast Alloys
    Autorzy:
    Krajewski, W. K.
    Buraś, J.
    Krajewski, P. K.
    Piwowarski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/379936.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high zinc Al alloy
    sand casting
    grain refinement
    damping capacity
    attenuation
    ultrasound wave
    strength properties
    stop wysokocynkowy
    stop Al
    odlew piaskowy
    rozdrobnienie ziarna
    tłumienie
    fala ultradźwiękowa
    właściwości wytrzymałościowe
    Opis:
    The paper presents results of measuring attenuation coefficient of the Al-20 wt.% Zn alloy (AlZn20) inoculated with different grain refiners. During experiments the melted alloys were doped with Al-Ti3-C0.15 refining master alloy. Basing on measurements performed by Krautkramer USLT2000 device with 1MHz ultrasound wave frequency it was stated that grain refinement reduces the attenuation coefficient by about 20-25%. However, the examined alloys can be still classified as the high-damping ones of attenuation greater than 150 dB/m.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 51-54
    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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