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    Wyświetlanie 1-12 z 12
    Tytuł:
    Evaluation of the Possibilities of Sodium Silicate Sands Application in Automated Hot-Box Process of Cores Shooting
    Autorzy:
    Stachowicz, M.
    Granat, K.
    Obuchowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382506.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry technology
    sodium silicate
    core box
    core shooting
    bending strength
    technologia odlewnicza
    krzemian sodu
    rdzennica
    rdzeń wstrzeliwany
    wytrzymałość na zginanie
    Opis:
    The paper presents the results of preliminary research on the use of silica sands with hydrated sodium silicate 1.5% wt. of binder for the performance of eco-friendly casting cores in hot-box technology. To evaluate the feasibility of high quality casting cores performed by the use of this method, the tests were made with the use of a semiautomatic core shooter using the following operating parameters: initial shooting pressure of 6 bar, shot time 4 s and 2 s, core-box temperature 200, 250 and 300 °C and core heating time 30, 60, 90 and 150 s. Matrixes of the moulding sands were two types of high-silica sand: fine and medium. Moulding sand binder was a commercial, unmodified hydrated sodium silicate having a molar module SiO2/Na2O of 2.5. In one shot of a core-shooter were made three longitudinal samples (cores) with a total volume of about 2.8 dm3. The samples thus obtained were subjected to an assessment of the effect of shooting parameters, i.e. shooting time, temperature and heating time, using the criteria: core-box fill rate, bending strength (RgU), apparent density and surface quality after hardening. The results of the trials on the use of sodium silicate moluding sands made it possible to further refine the conditions of next research into the improvement of inorganic warm-box/hot-box technology aimed at: reduction of heating temperature and shot time. It was found that the performance of the cores depends on the efficiency of the venting system, shooting time, filling level of a shooting chamber and grains of the silica matrix used.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 155-160
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Automatic Core Shooting Parameters in Hot-Box Technology on the Strength of Sodium Silicate Olivine Moulding Sands
    Autorzy:
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382292.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    sodium silicate
    olivine sand
    hot-box process
    core shooting
    odlewnictwo
    krzemian sodu
    piasek oliwinowy
    proces hot-box
    rdzeń
    Opis:
    The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the core-box: 200, 250 and 300°C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO2/Na2O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending RgU, apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 67-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Microwave Heating on the Molding Mass with Gypsum Binder Structure and Strength
    Autorzy:
    Paduchowicz, P. J.
    Granat, K.
    Biały, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837825.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    foundry materials
    foundry technologies
    plaster gypsum
    moulding and core sands
    strength of masses
    odlewnia
    materiały odlewnicze
    technologie odlewnicze
    gips
    masy formierskie
    wytrzymałość mas formierskich
    Opis:
    The paper presents results of influence microwave drying on strength and technological properties of molding sand with gypsum binder researches, which, immediately after making and after the natural initial setting in air for 1, 2 or 5 hours, was heated with 250 W microwave power for 3, 6, 9 and 12 min time periods. The test was carried out on a mass containing (% -wt.): 88% Grudzeń-Las quartz sand, 12% "Dolina Nidy" plaster gypsum and 6% water. The loss of moisture content during natural drying and then microwave drying was determined, significant from the point of view of using the mass with gypsum binder in the production of products, using an environmentally friendly technology without casting incompatibilities. Additionally, the compressive strength of the mass was measured. The influence of both drying methods on the binder crystallization process and the associated mass strength was demonstrated, especially in terms of the possibility of selecting parameters and / or intensifying a specific drying method for use in the technology of manufacturing molds and foundry cores.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 113-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Innovative microwave hardening of water-glass containing sandmixes in technical-economic approach
    Autorzy:
    Małachowska, A.
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382448.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    mikrofale
    szkło wodne
    masa formierska
    masa rdzeniowa
    innovative foundry technologies
    microwave hardening
    water glass
    moulding sand
    core sand
    Opis:
    In recent years, observed is increasing interest in sandmixes containing inorganic binders. These binders, including also water-glass, are harmless for the environment, neutral for humans and relatively cheap. In spite of numerous advantages, their wide application is restricted by poor knock-out properties and problems related to rebonding. Therefore, numerous researches aimed at eliminating disadvantages of water-glass binder are directed, among others, to modifying structure of hydrated sodium silicate or to applying new hardening techniques. The innovative method of rapid hardening by microwave heating, that permits restricting quantity of used binder and thus improving knock-out properties, meets expectations of present-day foundries. In this paper, compiled is available information on microwave hardening of water-glass containing sandmixes, as well as costs of practical application of this technology are evaluated on the ground of own research.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 75-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Selected Types of Lustrous Carbon Carriers After the High - Temperature Pyrolysis
    Autorzy:
    Kamińska, Jadwiga
    Stachowicz, M.
    Kubecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837781.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    green moulding sand
    lustrous carbon
    pyrolysis
    core shooting
    odlewnia
    piasek formierski
    węgiel błyszczący
    piroliza
    Opis:
    For research purposes and to demonstrate the differences between materials obtained from the carbonaceous additives to classic green moulding sands, five lustrous carbon carriers available on the market were selected. The following carbonaceous additives were tested: two coal dusts (CD1 and CD2), two hydrocarbon resins (HR1 and HR2) and amorphous graphite (AG1). The studies of products and material effects resulting from the high-temperature pyrolysis of lustrous carbon carriers were focused on determining the tendency to gas evolution, including harmful compounds from the BTEX group (benzene, toluene, ethylbenzene and xylene). Moreover, the content of lustrous carbon (LC), the content of volatile matter and loss on ignition (LOI) of the carbonaceous additives were tested. The solid products formed during high-temperature pyrolysis were used for the quantitative and qualitative evaluation of elemental composition after the exposure to temperatures of 875oC in a protective atmosphere and 950oC in an oxidizing atmosphere. The conducted studies have indicated the necessity to examine the additives to classic green moulding sands, which is of particular importance for the processing, rebonding and storage of waste sand. The studies have also revealed some differences in the quantitative and qualitative composition of elements introduced to classic moulding sands together with the carbonaceous additives that are lustrous carbon carriers. It was also considered necessary to conduct a research on lustrous carbon carriers for their proper and environmentally friendly use in the widely propagated technology of classic green sand system.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 56-62
    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:
    Impact of Hardening Methods on the Moulding Sand’s Properties with Gypsum Binder
    Autorzy:
    Granat, K.
    Paduchowicz, P.
    Dziedzic, A.
    Jamka, M.
    Biały, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840922.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    gypsum binder
    foundry masses
    core mass
    masses properties
    odlewnia
    spoiwo gipsowe
    masy odlewnicze
    masa rdzeniowa
    właściwości masy
    Opis:
    The research paper presents the results of testing the strength and technological properties of molding sand with gypsum binder, the bonding process proceeded: naturally or conventionally. The tests included mass containing (parts by weight): 78 pbw. Grudzeń-Las quartz sand, 22 pbw. plaster gypsum "Dolina Nidy” and 9 pbw. water. Measurements of compressive strength, shear, tensile and bending as well as permeability and looseness were carried out on standard cylindrical samples kept in the air for 1-96 hours or dried at 110oC for 1-8 hours. The results of the analysis were analyzed in connection with the mass structure and construction binding bridges warp grains observed with a scanning microscope (SEM). The influence of drying intensity on the bonding process and related mass properties has been demonstrated, especially from the point of view of the possibility of selection and / or intensification of a specific curing method for use in the production of gypsum binger molds and cores.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 13-17
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Moulding Sand Type on Mechanical and Thermal Deformation
    Autorzy:
    Grabarczyk, A.
    Major-Gabryś, K.
    Dobosz, S. M.
    Jakubski, J.
    Bolibruchová, D.
    Brůna, M.
    Pastirčák, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353843.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    moulding sand
    core sand
    organic binder
    inorganic binder
    mechanical deformation
    thermal deformation
    Opis:
    Casting industry has been enriched with the processes of mechanization and automation in production. They offer both better working standards, faster and more accurate production, but also have begun to generate new opportunities for new foundry defects. This work discusses the disadvantages of processes that can occur, to a limited extend, in the technologies associated with mould assembly and during the initial stages of pouring. These defects will be described in detail in the further part of the paper and are mainly related to the quality of foundry cores, therefore the discussion of these issues will mainly concern core moulding sands. Four different types of moulding mixtures were used in the research, representing the most popular chemically bonded moulding sands used in foundry practise. The main focus of this article is the analysis of the influence of the binder type on mechanical and thermal deformation in moulding sands.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 347-351
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of core manufacturing process with use of sand, bonded by ecological friendly nonorganic binders
    Autorzy:
    Fedoryszyn, A.
    Dańko, J.
    Dańko, R.
    Asłanowicz, M.
    Fulko, T.
    Ościłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/947570.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanization of foundry proces
    automation of foundry proces
    core blowing machine
    casting core
    inorganic binder
    mechanizacja procesu odlewniczego
    automatyzacja procesu odlewniczego
    maszyna odlewnicza
    rdzeń odlewniczy
    spoiwo nieorganiczne
    Opis:
    Mechanization of the process of core making with the use of inorganic and organic binders is based, almost solely, on core blowing machines. Presently the core blowing machines are equipped with tools and devices that allow for application of different technologies of core making. Cold-box, hot-box and warm-air technologies require that core blowing machines shall be additionally equipped with either core-box pre-heating system or gas purging and neutralization system, or hot air purging systems. Considering the possibility of using varied, the most advantageous technologies of core making, the production of universal core blowing machines equipped with replaceable devices has been undertaken in Poland. The universal core blowing systems allow for mechanization of core making process also with the use of sand, bonded by modern, eco-friendly binder systems. The paper presents selected results-based evaluation of core blowing process showing the scope of conducted design and implementation works.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification Odor Compounds Emitted During the Heating of Molding Sands
    Autorzy:
    Faber, J.
    Perszewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381019.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry binders
    odor
    molding sand
    core
    thermal decomposition
    gas chromatography
    odlewy
    zapach
    piasek formierski
    rdzeń
    rozkład termiczny
    chromatografia gazowa
    Opis:
    The paper presents the results of analyzes of gases emitted during exposure to high temperature foundry molding sands, where binders are organic resins. As a research tool has been used special gas chromatograph designed to identify odorous compounds including the group of alkanes.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 178-182
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związki zapachowe w gazach z rozkładu termicznego spoiw formierskich
    Aromatic compounds in waste gases formed during thermal decomposition of foundry binders
    Autorzy:
    Faber, J.
    Perszewska, K.
    Żmudzińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391569.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    spoiwa odlewnicze
    masy formierskie
    masy rdzeniowe
    rozkład termiczny
    odory
    chromatografia gazowa
    foundry binders
    moulding sands
    core sands
    thermal decomposition
    odours
    gas chromatography
    Opis:
    Przedstawiono wyniki analiz gazów powstających w wyniku działania wysokich temperatur na masy formierskie, w których jako spoiwo zastosowano wybrane, powszechnie stosowane w odlewniach żywice organiczne i utwardzacze. Jako narzędzie badawcze zastosowano specjalistyczny chromatograf gazowy przeznaczony do identyfikacji wyłącznie związków zapachowych z grupy alkanów.
    The paper presents the results of analysis of gases formed under the impact of high temperature acting on moulding sands with the addition of selected organic resins and hardeners, commonly used in foundries as binders for these sands. As a research tool, a dedicated gas chromatograph, designed to identify specifically aromatic compounds from the group of alkanes, was applied.
    Źródło:
    Prace Instytutu Odlewnictwa; 2015, T. 55, nr 3, 3; 23-32
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Core Sands Properties in Blowing Process
    Autorzy:
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381670.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    core
    blowing process
    core sand
    odlewnictwo
    rdzeń odlewniczy
    masa rdzeniowa
    Opis:
    The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting) depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number, distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand. Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties on the basis of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability factor provide a better possibility of assessing the core sand behaviour during flowing and core box filling, which indicate the value and structure of the obtained compacting decisive – after hardening – for strength and permeability. The mentioned above aspects are analysed – on the basis of authors’ own examinations - in the hereby paper.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 13-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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