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    Wyświetlanie 1-12 z 12
    Tytuł:
    Influence of the gas dosage method on pressure changes and technological properties of core sand used in the technology resol-CO2
    Wpływ sposobu dozowania gazu na przebiegi zmian ciśnienia i właściwości technologiczne mas stosowanych w technologii resol-CO2
    Autorzy:
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/356947.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pressure measurements
    fast-setting sands
    impulse gas dosage
    moulding sand strength
    masy szybkowiążące
    pomiary ciśnienia
    pulsacyjne dozowanie gazu
    masa formierska
    Opis:
    The results of gas pressure measurements in intergranular spaces of fast-setting sands hardened by active gaseous factor are presented in the paper. The research stand and the measuring methodology are described. Investigations concern the determination and recording gas pressure changes in the core sand along the hardened core, in three measuring points. The hardening gas was introduced both in a continuous and impulse way (gas-pause) at a constant pressure. The determined pressure changes of the active gas, which takes part in the chemical reaction of the hardening process, are compared with pressure changes of the neutral gas. The influence of the impulse way of a gas dosage on the core sand strength properties is presented as well as methods of limiting the active gas consumption are shown.
    W artykule zaprezentowano wyniki pomiaru ciśnienia gazu w przestrzeniach międzyziarnowych dla mas szybkowiążących utwardzanych aktywnym czynnikiem gazowym. W pracy przedstawiono stanowisko pomiarowe, a także opisano metodykę pomiarową. Badania dotyczą wyznaczenia i rejestracji przebiegów zmian ciśnienia gazu w masie po wysokości utwardzanego rdzenia w trzech punktach pomiarowych. Gaz utwardzający był wprowadzany w sposób ciągły i pulsacyjny (gaz-przerwa) o stałym ciśnieniu. Wyznaczone przebiegi zmian ciśnienia dla gazu aktywnego, biorącego udział w reakcji chemicznej procesu utwardzania, porównano z przebiegami zmian ciśnienia dla gazu obojętnego. Przedstawiono wpływ impulsowego sposobu dozowania gazu na właściwości wytrzymałościowe masy formierskiej, ponadto zaprezentowano sposoby ograniczenia zużycie gazu aktywnego.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 891-894
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Assessment of the Permeability of Selected Protective Coatings Used for Sand Moulds and Cores
    Autorzy:
    Jamrozowicz, Ł.
    Siatko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381009.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    permeability
    protective coatings
    coating viscosity
    core
    mold
    przepuszczalność
    powłoki ochronne
    lepkość powłoki
    rdzeń
    forma
    Opis:
    The article presents the results of permeability measurements of a zirconium alcohol coating applied on moulds and cores. The introduction extensively discusses the reasons for the application of protective coatings, as well as their advantages and disadvantages. Also, the problems related to the application of protective coatings are presented i.e. limited permeability and thus the possibility of the presence of gas-originated defects in the casts. Next, the paper discusses the methods of measuring the permeability of protective coating proposed by Falęcki and Pacyniak. The study also presents an indirect permeability measurement method. For the investigations, zirconium alcohol coatings with the three conventional viscosities 10, 20 and 30s were used. The viscosity was determined by means of the Ford cup with the clearance of 4mm. The coatings were applied onto profiles of Φ 50x50 mm, made of moulding sand consisting of a sand matrix with the mean grain size of dL = 0,11, 17, 24, 31 and 34 mm and phenol-formaldehyde resin. The effect of the matrix grain size on the permeability of the sand with and without a coating was determined.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Density Distribution and Resin Migration Investigations in Samples of Sand Core Made by Blowing Method
    Autorzy:
    Dańko, R.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/106993.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    core shooting
    core blowing
    molding sand
    resin migration
    Opis:
    Resin migration in a core can occur during the core production process performed by blowing methods in which the core sand is transported into the core box as a two-phase sand-air flux characterized by various working parameters (working pressure, shooting time, volumetric concentration). This migration is the result of the resin being blown off from the matrix grain surfaces by compressed air. The methodology of the investigation of this effect developed at AGH University of Science and Technology is presented in this paper. The results of the resin migration tests obtained for cores made with cold-box technology at various working parameters of the shooting process are also shown.
    Źródło:
    Journal of Casting & Materials Engineering; 2017, 1, 3; 70-73
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rheological Properties of Typical Ceramic Slurries Used in the Lost Wax Technology
    Autorzy:
    Kolczyk, J.
    Jamrozowicz, Ł.
    Kaźnica, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/379793.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rheological properties
    non–Newtonian fluid
    ceramic slurries
    właściwości reologiczne
    płyn nienewtonowski
    mieszanki formierskie
    Opis:
    The results of investigations of the rheological properties of typical ceramic slurries used in the investment casting technology – the lost wax technology are presented in the paper. Flow curves in the wide range of shear velocity were made. Moreover, viscosity of ceramic slurries depending on shearing stresses was specified. Tests were performed under conditions of three different temperatures 25, 30 and 35oC, which are typical and important in the viewpoint of making ceramic slurries in the investment casting technology. In the light of the performed investigations can be said that the belonging in group of Newtonian or Non – Newtonian fluid is dependent on content of solid phase (addition of aluminum oxide) in the whole composition of liquid ceramic slurries.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 197-201
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Reclaim Addition into the Matrix on the Hardening Process Kinetics of the Moulding Sand with Furfuryl Resin
    Autorzy:
    Jamrozowicz, Ł.
    Kolczyk, J.
    Wojtuń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/381643.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    reclaim addition
    hardening process
    furfuryl resin
    masa formierska
    dodatki
    utwardzanie
    żywica furfurylowa
    Opis:
    Measurements of the hardening process course of the selected self-hardening moulding sands with the reclaimed material additions to the matrix, are presented in the hereby paper. Moulding sands were produced on the „Szczakowa” sand (of the Sibelco Company) as the matrix of the main fraction FG 0,40/0,32/0,20, while the reclaim was added to it in amounts of 20, 50 and 70%. Regeneration was performed with a horizontal mechanical regenerator capacity of 10 t/h. In addition, two moulding sands, one on the fresh sand matrix another on the reclaimed matrix, were prepared for comparison. Highly-fluid urea-furfuryl resin was used as a binder, while paratoluensulphonic acid as a hardener. During investigations the hardening process course was determined, it means the wave velocity change in time: cL = f(t). The hardening process kinetics was also assessed (dClx/dt = f(t)). Investigations were carried out on the research stand for ultrasound tests. In addition strength tests were performed.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 41-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Selected Factors on the Ceramic Moulds Permeability Determined by the New Method
    Autorzy:
    Kolczyk, J.
    Zych, J.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/382719.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    investment casting technology
    permeability
    ceramic moulds
    innowacyjne technologie odlewnicze
    materiały odlewnicze
    technologia odlewania
    przepuszczalność
    formy ceramiczne
    Opis:
    Ceramic moulds in the investment casting technology are made by depositing on the wax pattern subsequent layers of a liquid ceramic mass together with a granular matrix. A quality of castings depends on building of individual layers. The results of the ceramic moulds permeability obtained by means of the newly developed measuring method are presented in the hereby paper. Due to the applied solution it is possible to perform measurements also for the first layers which have the decisive influence on a permeability of the whole multilayer ceramic mould. Investigations of the influence of the matrix grain size and annealing temperature on the permeability of ceramic moulds were carried out.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Gas Flows in Cores About the Changeable Cross-sections Executed in the Cold-box Technology
    Autorzy:
    Jamrozowicz, Ł.
    Zych, J.
    Kolczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383372.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold-box process
    gas flows
    pressure measurement
    carbon dioxide
    moulding sands
    cold box
    przepływ gazu
    pomiar ciśnienia
    dwutlenek węgla
    piaski formierskie
    hartowanie
    Opis:
    The measurement results of the gas pressure in intergranular spaces of fast-setting moulding sands, hardened by a reactive gaseous factor, are presented in the hereby paper. In addition, the new research stand for measuring gas pressure changes in the core of a variable cross-section, during hardening of this core, is shown. The measuring method is also described. Investigations concern determinations and recording of the gas pressure pathways in moulding sands along the core height, in five measuring points. The influence of the hardening gas pressure on the gas distribution in the moulding sand was determined. The influence of the shape change (cross-section) of the core on the character of changes of the hardening gas pressure in the core being hardened, was also shown. The hardening gas of a constant pressure was fed continuously into the core.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 41-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Al2O3 Solid Phase on the Kinetics of Binding Ceramic Moulds
    Autorzy:
    Kolczyk, J.
    Zych, J.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/380203.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    investment casting technology
    ultrasonic test
    ceramic mould
    aqueous binder
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    technologia wytapianych modeli
    pomiar ultradźwiękowy
    forma ceramiczna
    spoiwo wodniste
    Opis:
    The investigation results of the kinetics of binding ceramic moulds, in dependence on the solid phase content in the liquid ceramic slurries being 67, 68 and 69% - respectively, made on the basis of the aqueous binding agents Ludox AM and SK. The ultrasonic method was used for assessing the kinetics of strengthening of the multilayer ceramic mould. Due to this method, it is possible to determine the ceramic mould strength at individual stages of its production. Currently self-supporting moulds, which must have the relevant strength during pouring with liquid metal, are mainly produced. A few various factors influence this mould strength. One of them is the ceramic slurry viscosity, which influences a thickness of individual layers deposited on the wax model in the investment casting technology. Depositing of layers causes increasing the total mould thickness. Therefore, it is important to determine the drying time of each deposited layer in order to prevent the mould cracking due to insufficient drying of layers and thus the weakening of the multilayer mould structure.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 91-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Research of Desiccation Rates Selected Protective Coating Used on Mould and Sand Cores
    Autorzy:
    Jamrozowicz, Ł.
    Zych, J.
    Snopkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381440.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    protective coating
    water coating
    kinetics of drying
    gravimetric technique
    powłoka ochronna
    powłoka wodna
    kinetyka suszenia
    technika grawimetryczna
    Opis:
    Investigation results of the drying rate of the selected protective water coatings are presented in the paper. The water coating WC-R was subjected to examinations. The drying kinetics of this coating was determined. The coating was deposited on cores of the moulding sand of the matrix grain size being: dL= 0.20 mm; 0.24 mm; 0.34 mm. In addition, the kinetics of the coating drying process was determined for three conventional viscosities (15s; 22s; 34s). The coating viscosity was estimated by means of the Ford 4mm cup. Drying rates of the protective coating were examined by using the gravimetric technique (weight). Measurements were carried out in a continuous way under controlled conditions: constant ambient temperature and air humidity.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the Thickness of Protective Coatings Deposited on Moulds and Cores
    Autorzy:
    Jamrozowicz, Ł.
    Kolczyk-Tylka, J.
    Siatko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380191.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    protective coating
    coating thickness
    coating viscosity
    foundry core
    foundry mold
    powłoka ochronna
    grubość powłoki
    lepkość powłoki
    rdzeń odlewniczy
    masa odlewnicza
    Opis:
    This article presents measurements of the thickness of alcohol-based coatings on sand foundry cores and moulds. These coatings were applied using two methods, the dipping method and the painting method. For the purposes of the study, a zircon alcohol-based coating was prepared with three different levels of nominal viscosity; very thin at 10s, average at 20s, and thick at 30s. The coating was applied to a core made of quartz sand and furan resin. The cores were made of sand with three different grain sizes; dL = 0.22 mm – fine sand, dL = 0.33 mm medium sand, and dL = 0.47 mm coarse sand. In the study, the thickness of the coating obtained to the core was measured immediately after application as well as after drying. Additionally, the extent of penetration into the intergranular spaces of the core matrix was measured. On the basis of this study, the impact of the grain size of the core matrix on the thickness of the coating and its penetration into the core was assessed. The thickness of coatings obtained using different application methods was also assessed.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 131-136
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Hardener Type on the Hardening Process Kinetics of the Selected Self-setting Sands
    Autorzy:
    Jamrozowicz, Ł.
    Kolczyk, J.
    Kaźnica, N.
    Pyziak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/381668.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loose self-setting sands
    hardening kinetics
    ultrasound investigations
    Opis:
    Measurements of the hardening process of the selected self-setting sands are presented in the hereby paper. Moulding sands were prepared on the matrix of „Szczakowa” sand of the Sibelco Company. Two resins: phenol-formaldehyde-furfuryl (FF/AF) and urea-formaldehyde-furfuryl (MF/AF) were used for making moulding sands. – Methylbenzene-sulphonic acid was applied as a hardener for the moulding sand on FF/AF resin, while paratoluene-sulphonic acid for the moulding sand on MF/AF resin. Both hardeners were used in two concentrations: low – the so-called ‘slow’ hardener and high - ‘fast’ hardener. During investigations the courses of the hardening process were determined, more accurately changes of the velocity of the ultrasound wave passage through the moulding sand cL = f(t) and changes of the moulding sand hardening degree versus time, Sx = f(t). In addition the kinetics of the hardening process was determined. Measurements were performed on the research stand for ultrasound investigations.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 73-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Conductivity of Moulding Sand with Chemical Binders, Attempts of its Increasing
    Przewodność cieplna mas formierskich ze spoiwami chemicznymi, próby jej zwiększenia
    Autorzy:
    Zych, J.
    Mocek, J.
    Snopkiewicz, T.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/351198.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal conductivity
    moulding sands
    investigation methods
    binders
    przewodność cieplna
    masa formierska
    metody badań
    spoiwa
    Opis:
    The investigation results of the thermal conductivity of the selected group of moulding sands with chemical binders, mainly organic, are presented in the hereby paper. Studies encompassed also moulding sands into which additions improving the thermal conductivity were introduced. Two testing methods were applied, i.e. investigations at a steady and unsteady temperature zone. For investigations at a steady temperature zone the new original experimental stand was designed and built, adapted also for testing moulding sands with binders undergoing destruction at relatively low temperatures.
    W pracy przedstawiono wyniki badań zdolności do przewodzenia ciepła wybranej grupy mas ze spoiwami, głównie organicznymi. Badaniami objęto również masy, do których wprowadzono dodatki dla zwiększenia przewodności cieplnej. Zastosowano dwie metody badań przewodności cieplnej, tj. badania w ustalonym polu temperatury i badania w nieustalonym polu. Dla badań w stacjonarnym polu zbudowano nowe, oryginalne stanowisko pomiarowe, dostosowane do badań mas ze spoiwami ulegającymi destrukcji w stosunkowo niskiej temperaturze (spoiwa organiczne). Wyniki badań przedstawiono graficznie w układzie: λ = f(T) - współczynnik przewodzenia w funkcji temperatury. Wykazano istnienie minimum funkcji w temperaturze niższej niż w przypadku mas klasycznych. Wprowadzanie do masy dodatku grafitu zwiększa jej przewodność. Wprowadzenie grafitu nie wpływa istotnie na proces wiązania mas furanowych. Masy ze szkłem wodnym charakteryzują się lepszą przewodnością, szczególnie w wyższych (T>400°C) temperaturach.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 351-357
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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