Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "odlewnictwo" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-9 z 9
    Tytuł:
    Impact of Higher Temperature on Quartz Moulding Sand with Gypsum Binders
    Autorzy:
    Paduchowicz, P.
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382554.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    building gypsum
    gypsum putty
    pH
    LOI
    odlewnictwo
    gips
    spoiwo gipsowe
    Opis:
    This paper presents initial findings from research into the possibility of using gypsum binders in quartz moulding sand that could be used in the production of casting moulds and cores. For the purposes of the research two commercial types of gypsum were used as binders: building gypsum and gypsum putty. Dry components of moulding sand i.e. medium quartz sand and gypsum were mixed in proportion of 89/11 parts by weight. In order to achieve bonding properties for the binders, 5 parts by weight of water was added to the mixture of dry components. After 24 hours of adding water and mixing all the components, the moulding sand, naturally hardened, was subjected to high temperature. The moulding sand thus produced, i.e. with cheap and environmentally-friendly gypsum binders, was eventually analysed after heating (at temperatures of 300oC, 650oC and 950oC) and cooling in order to determine changes in the following parameters: LOI – loss on ignition, chemical composition and pH. Moreover, investigated were bonding bridges, before and after the moulding sand was roasted. The research results revealed differences in the structure of bonding bridges and the occurrence of automatic adhesive destruction for both types of gypsum binders. For two types of moulding sands under the investigation of the LOI exceeded 2.59wt.% (with building gypsum) or 2.84wt.% (with putty gypsum) and pH increased to ca. 12 as a result of increasing roasting temperature from 300oC to 650oC. Next, roasting at 950oC decrease value of LOI in both types of moulding sands. Moulding sand with builoding gypsum roasted at 950oC revealed a return to the value of pH parameter measured prior to annealing.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 81-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Microwave Absorbing Effectiveness by the Selected Molding Sands Matrixes
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Więcławek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/382514.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    microwaves
    quartz sand
    absorption
    water
    odlewnictwo
    mikrofale
    piasek kwarcowy
    absorpcja
    woda
    Opis:
    The paper presents the results of the absorption effectiveness measured for electromagnetic waves with a frequency of 2.45 GHz penetrating selected quartz mold and core sands matrixes. Research was conducted with a usage of the unique microwave slot line for assessing, on the basis of the measured parameters of looseness, the effectiveness of microwaves absorbing capacity by the matrixes of molding sands. Examinations were focused on the high-silica quartz matrixes from various mines with a different grain size composition and humidity. Usage of the unique measuring device, designed especially for this type of research, has made possibility to systematize knowledge of the dynamics and efficiency of microwaves absorption while penetrating humid matrix of molding sands. Analysis of the study results indicate, that the process of microwaves absorbing is affect, in addition to water located on the matrix grains surfaces, by the grain size distribution and the origin of the quartz sand.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 175-180
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Sand Wetting on Physically Hardened Moulding Sands Containing a Selected Inorganic Binder. Part 1
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Pałyga, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/381331.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    microwaves
    water glass
    wetting
    strength
    odlewnictwo
    mikrofale
    szklanka wody
    zwilżanie
    wytrzymałość
    Opis:
    In the paper, an attempt was made to evaluate the effect of preliminary wetting of high-silica base during preparation of moulding sands containing a selected grade of sodium water-glass, designed for hardening by traditional drying or by electromagnetic microwaves at 2.45 GHz. In the research, some water was dosed during stirring the sandmix before adding 1.5 wt% of the binder that was unmodified sodium water-glass grade 137, characterised by high molar module within 3.2 to 3.4. Scope of the examinations included determining the effect of wetting the base on mechanical parameters like compression, bending and tensile strength, as well as on technological parameters like permeability, abrasion resistance and apparent density. The research revealed a significant positive effect of adding water to wet surfaces of high-silica base grains on mechanical properties and quality of moulding sands hardened by physical methods, in particular by microwave heating.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 73-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ dodatku zwilżającego osnowę kwarcową na parametry suszonych mas formierskich ze szkłem wodnym sodowym
    The effect of wetting agent on the parameters of dry moulding silica sands bonded with sodium water glass
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Pałyga, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/391550.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    odlewnictwo
    suszenie
    masa formierska
    szkło wodne
    wytrzymałość
    zwilżalność
    foundry industry
    drying
    moulding sand
    water glass
    strength
    wettability
    Opis:
    W pracy podjęto próbę określenia wpływu dodatku zwilżającego powierzchnię osnowy kwarcowej, wprowadzonego dla zwiększenia efektywności utwardzania, wybraną metodą fizyczną, ekologicznych mas ze szkłem wodnym sodowym. Ocenę wpływu zwilżania wodą osnowy kwarcowej, przed wprowadzeniem w procesie mieszania niemodyfikowanych, nieorganicznych spoiw, przeprowadzono na podstawie porównania parametrów wytrzymałościowych i technologicznych mas świeżo sporządzonych i utwardzonych suszeniem w temperaturze 100°C. W badaniach zastosowano piasek kwarcowy średni oraz trzy gatunki uwodnionego krzemianu sodu: 137, 140 i 145. Stwierdzono, że modyfikacja sposobu przygotowania osnowy kwarcowej poprzez wprowadzenie dodatku wody, przed dodaniem niewielkiej, 1,5 cz. mas. spoiwa, korzystnie wpływa na osiągane po utwardzeniu parametry wytrzymałościowe i technologiczne mas. Wyniki pomiarów skonfrontowano z obserwacjami połączeń ziaren osnowy kwarcowej, przeprowadzonymi za pomocą mikroskopu skaningowego. Uzupełniono je również zdjęciami i analizą składu chemicznego powierzchni ziaren kwarcu. Na podstawie kompleksowej oceny, utwardzonych suszeniem klasycznym mas formierskich, stwierdzono pozytywny wpływ obecności dodatku zwilżającego w masach, którego najkorzystniejsza ilość powinna być dobierana w zależności od gatunku użytego spoiwa.
    An attempt has been made to determine the effect of the addition of an agent wetting the surface of silica sand grains, introduced in order to increase the hardening efficiency of selected physical methods applied to the ecological foundry sands bonded with sodium water glass. The effect of water used as a wetting agent of the silica sand grains, added during the mixing process prior to the introduction of unmodified inorganic binders, was evaluated by comparing the mechanical and technological parameters of green sands and sands hardened by drying at 100°C. Tests and studies were carried out on silica sand of medium grain size and on three grades of hydrated sodium silicate, i.e. 137, 140 and 145. It has been found that modification of the method of the base sand processing by adding water prior to the addition of a small amount (1.5 parts by weight) of binder has a beneficial effect on the technological and mechanical parameters of moulding sands obtained after the hardening process. The results of measurements were confronted with the SEM studies of bonds formed between the grains of silica sand. The studies were completed with photographs and chemical analysis of the surface of silica sand grains. Based on a comprehensive evaluation of moulding sands hardened by the conventional drying process, the beneficial effect of a wetting agent, added to the sand mixture in an amount optimum for a given type of binder, has been confirmed.
    Źródło:
    Prace Instytutu Odlewnictwa; 2016, 56, 1; 43-55
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Sand Wetting on Physically Hardened Moulding Sands Containing a Selected Inorganic Binder. Part 2
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Pałyga, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/379478.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    microwaves
    hardening
    moulding sand
    inorganic binder
    strength
    odlewnictwo
    mikrofale
    hartowanie
    masa formierska
    spoiwo nieorganiczne
    wytrzymałość
    Opis:
    In the paper, an attempt is made to explain the previously observed increased effectiveness of utilising hydrated sodium water-glass grade 137 after hardening moulding sands with selected physical methods. In the modified process of preparing sandmixes, during stirring components, water as a wetting additive was introduced to the sand-binder system. Presented are examination results of influence of faster microwave heating and slower traditional drying of the so-prepared moulding sands on their tensile and bending strength, calculated per weight fraction of the binder. The measurement results were confronted with SEM observations of linking bridges and with chemical analyses of grain surfaces of high-silica base. On the grounds of comprehensive evaluation of hardened moulding sands, positive effects were found of the applied physical process of binder dehydration and presence of the wetting additive. It was observed that introduction of this additive during stirring, before adding the binder, improves flowing the binder to the places where durable linking bridges are created. It was also found that the applied methods of hardening by dehydration enable creation of very durable linking bridges, strongly connected with the sand base, which results in damages of high-silica grain surfaces, when the bridges are destroyed.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate
    Autorzy:
    Stachowicz, M.
    Kamiński, M.
    Granat, K.
    Pałyga, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/382605.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    chromite sand
    moulding sand
    baking temperature
    sodium silicate
    odlewnictwo
    piasek formierski
    masa formierska
    temperatura zapiekania
    krzemian sodu
    Opis:
    In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200 °C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 147-152
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate
    Autorzy:
    Stachowicz, M.
    Kamiński, M.
    Granat, K.
    Pałyga, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/381070.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    chromite sand
    moulding sand
    baking temperature
    sodium silicate
    odlewnictwo
    piasek formierski
    masa formierska
    temperatura zapiekania
    krzemian sodu
    Opis:
    In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200°C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 95-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochłanianie mikrofal przez nieutwardzone masy formierskie ze szkłem wodnym
    Microwave Absorption by Unhardened Molding Sands with Water-Glass
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379879.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewnictwo
    mikrofale
    szkło wodne
    pomiar stratności
    masa sypka
    masa samoutwardzalna
    founding
    microwaves
    water glass
    loss factor measurement
    self hardening moulding sand
    Opis:
    W pracy przedstawiono wyniki badań wstępnych pochłaniania fal elektromagnetycznych o częstotliwości 2,45 GHz przez masy formierskie sporządzone z różnymi gatunkami szkła wodnego sodowego. Zakres badań obejmował określenie wartości strat energii mikrofal, na podstawie pomiarów tłumienności wykonanych w trakcie ich propagacji przez wypełniony masą falowód. Pomiary strat mocy sygnału mikrofalowego prowadzono z zastosowaniem unikatowego stanowiska mikrofalowej linii szczelinowej. Na podstawie uzyskanych wyników badań stwierdzono, że stanowisko to wspomaga, na podstawie zmierzonych wartości strat sygnału mikrofalowego, ocenę skuteczności pochłaniania mikrofal przez kwarcowe masy formierskie zawierające różną ilość wybranych gatunków spoiw stosowanych w masach SMS. Przeprowadzone badania wykazały, że straty sygnału mikrofalowego związane są z: modułem i ilością wprowadzonego do masy szkła wodnego.
    In the paper are presented results of the preliminary research of absorption of electromagnetic waves with a frequency of 2.45 GHz by molding sands prepared with different kinds of sodium water-glass binders. The scope of the research included assessment of the losses of microwave energy, which were based on the loss measurements during their propagation through the waveguide filled with the molding sand. Measurements of the losses of microwave signal power was carried out using the unique test stand, which was the microwave slot line. On the basis of the preliminary research it was found, that this test stand helps to evaluate the effectiveness of microwave absorption by quartz molding sands containing different number of selected kinds of binders used in SMS sandmixes, by the usage of measured values of the microwave signal losses. Research have shown, that the loss of the microwave signal are associated with: the module and the amount of water-glass binder added to the molding sand.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 169-174
    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
      Wyświetlanie 1-9 z 9

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies