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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Effect of the Return Material Implementation into the Production of Silumin Casts on Technological and Economic Indicators of Production Process
    Autorzy:
    Gaspar, S.
    Majernik, J.
    Trytek, A.
    Podaril, M.
    Benova, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126917.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    product development
    quality management
    mechanical properties
    castings defects
    rozwój produktu
    zarządzanie jakością
    właściwości mechaniczne
    wady odlewów
    Opis:
    The production of high pressure die casts also brings difficulties regarding the processing of the waste material. It is mainly formed by runners, overflows and other foundry supplements used and, in the case of machines using the cold chamber, also the remainder from this chamber. As this material is often returned to the production process, we refer to it as return material. In the production process, it is therefore essential to deal with the proportion issue of return material against primary material that can be added to the melt to maintain the required cast properties. The submitted article monitors the quality properties of the alloy, selected mechanical properties of casts and porosity depending on the proportion of the return material in the melt. At the same time, the material savings are evaluated with regards to the amount of waste and the economic burden of the foundries. To monitor the above-mentioned factors, series of casts were produced from the seven melting process variants with a variable ratio of return to the primary material. The proportion ratio of return material in the primary alloy was adjusted from 100% of the primary alloy to 100% of the return material in the melting process. It has been proven that with the increasing proportion of the return material, the chemical composition of the melt changes, the mechanical properties of the alloy decrease and the porosity of the casts increases. Based on the results of the tests and analyzes, the optimal ratio of return and primary material in the melting process has been determined. Considering the prescribed quality of the alloy and mechanical properties, concerning the economic indicator of the savings, the ratio is set at 70:30 [%] in favor of the primary material.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 69--76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Overflow Connecting Channel Cross-Section Design on Selected Parameters of High Pressure Die Casting
    Autorzy:
    Majernik, J.
    Podařil, M.
    Gojdan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837718.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    odlewanie wysokociśnieniowe
    system przelewowy
    system bramkowania
    przepływ stopu
    die casting
    high pressure die casting
    overflow system
    gating system
    melt flowing
    Opis:
    High pressure die casting technology (HPDC) is a method enabling the production of shape-complex casts with good mechanical properties, with high repeatability of production within narrow tolerance limits. However, the casts show, to some extent, basic porosity, which may reduce their mechanical and qualitative properties. One of the main areas to focus on in order to reduce the porosity of casts is the correct design and structure of the gating and overflow system. Submitted article is devoted to the assessment of the connecting channel cross-section design for connecting the overflows to the cast on selected parameters of the casting process. Five different cross-section designs of connecting channels are considered, enabling the removal of gases and vapors from the volume during the molding. The connecting channels are designed with a constant width g = 10mm and variable height h1 =1.50 mm, h2 = 1.25 mm, h3 = 1.00 mm, h4 = 0.75 mm and h5 = 0.6 mm. The primary monitored parameter is the gas entrapment in selected points of the cast. The following is an evaluation of the pressure conditions change in the mold cavity at the end of the filling mode and local overheating of the mold material just below the surface of the mold face. With regard to the monitored parameters, based on the performed analyzes, the most suitable design solution of the connecting channel is assessed and recommendations for the design and structure of the overflows and their connection to the cast are derived.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 75-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Temperature Distribution of a Die Casting Mold of X38CrMoV5_1 Steel
    Autorzy:
    Majernik, J.
    Podařil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380463.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting process
    simulation
    temperature distribution
    mould material
    proces odlewania
    symulacja
    rozkład temperatury
    masa odlewnicza
    Opis:
    Relatively cold die material comes into contact with the substantially higher temperature melt during the casting cycle, causing high thermal fluctuations resulting into the cyclic change of thermal field. The presented contribution is devoted to the assessment of the impact of temperature distribution on individual zones in the die volume. The evaluated parameter is the die temperature. It was monitored at two selected locations with the 1 mm, 2 mm, 5 mm, 10 mm and 20 mm spacing from the die cavity surface to the volume of cover die and ejector die. As a comparative parameter, the melt temperature in the middle of the runner above the measuring point and the melt temperature close to the die face were monitored. Overall, the temperature was monitored in 26 evaluation points. The measurement was performed using the Magmasoft simulation software. The input settings of the casting cycle in the simulation were identical to those in real operation. It was found, that the most heavily stressed die zones by temperature were within the 20 mm from the die face. Above this distance, the heat supplied by the melt passes gradually into the entire die mass without significant temperature fluctuations. To verify the impact of the die cooling on the thermal field, a tempering system was designed to ensure different heat dissipation conditions in individual locations. At the end of the contribution, the measures proposals to reduce the high change of thermal field of dies resulting from the design of the tempering channel are presented. These proposals will be experimentally verified in the following research work.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 107-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Runner Geometry on the Gas Entrapment in Volume of Pressure Die Cast
    Autorzy:
    Majernik, J.
    Podařil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382678.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    high pressure die casting
    runner dimensions
    air entrapment
    product development
    melt flow
    odlew wysokociśnieniowy
    rynna
    uwięzione powietrze
    przepływ stopu
    Opis:
    The high pressure die casting technology allows the production of complex casts with good mechanical properties, with high production repeatability within narrow tolerance limits. However, the casts are somewhat porous, which may reduce their mechanical properties. There are several recommendations for reducing the porosity of casts, which are aimed at setting the technological parameters of the casting cycle. One of the primary and important ways to reduce the porosity and air entrapment in the melt is a suitable gating system design. Submitted contribution is devoted to assessing the influence of the runner branching geometry on the air entrapment within the cast volume during the filling phase of the casting cycle. Four variants of the gating system for a particular cast are compared with different design of main runner branching. The initial design is based on a real gating system where the secondary runner is connected to the main runner at an angle of 90 °. The modified designs are provided with a continuous transition of the main runner into the secondary ones, with the change in the branching runner radius r1 = 15 mm, r2 = 25 mm and r3 = 35 mm. The air entrapment in the melt is assessed within the cast volume behind the cores, which have been evaluated as a critical points with respect to further mechanical treatment. When designing the structural modification of geometry it was assumed that by branch changing using the radius value r3 = 35 mm, the melt flows fluently, and thus the value of the entrapped air in the volume of the cast will be the lowest. This assumption was disproved. The lowest values of entrapped air in the melt were found in the casts with runner transition designed with radius r1 = 15 mm. The conclusion of the contribution explains the causes of this phenomenon and from a designing point of view it presents proposal for measures to reduce the entrapment of the air in casts.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 33-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of integrated management systems according to the revised ISO standards
    Model zintegrowanych systemów zarządzania według zmienionych standardów ISO
    Autorzy:
    Majernik, M.
    Daneshjo, N.
    Chovancova, J.
    Sanciova, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/405346.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    management system
    integration
    standardization
    algorithm of implementation
    designing IMS
    HLS structure
    system zarządzania
    integracja
    standaryzacja
    algorytm implementacji
    projektowanie IMS
    struktura HLS
    Opis:
    An implementation of international standards in the management systems of organizations is increasingly promoted in non-regulated sector in globalized markets. Authors of the paper present the partial results of the research in the area of projecting and implementation of integrated management systems according to international standards ISO 9001, ISO 14001, OHSAS 18001, ISO 27001 etc. Based on an analysis of the latest standards for management sub-systems with HLS structure implementation, an innovative concept of model for an implementation and maintaining of integrated management systems is introduced. The proposed process algorithm on Deming’s PDCA cycle of the implementation is applicable to any type of organization and economic sector according to the NACE codes and with the respect to newly adopted requirements of ISO standards, e.g. documented information on IMS.
    Wdrożenie międzynarodowych standardów w zakresie systemów zarządzania organizacji jest coraz częściej promowane w nieregulowanym sektorze w zglobalizowanych rynkach. Autorzy niniejszego artykułu przedstawiają częściowe wyniki badań w zakresie projektowania i wdrażania zintegrowanych systemów zarządzania zgodnie z międzynarodowymi normami ISO 9001, ISO 14001, OHSAS 18001, ISO 27001 itd. W oparciu o analizę najnowszych standardów dla podsystemów zarządzania z wdrożeniem struktury HLS, wprowadzono innowacyjną koncepcję modelu wdrożenia i utrzymania zintegrowanych systemów zarządzania. Proponowany algorytm procesu w cyklu wdrażania PDCA Deminga, który uwzględnia nowo przyjęte wymagania norm ISO, np. udokumentowane informacje o IMS, ma zastosowanie do każdego rodzaju organizacji i sektora gospodarki według kodów NACE.
    Źródło:
    Polish Journal of Management Studies; 2017, 15, 1; 135-143
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanopores in Silica Aerogels
    Autorzy:
    Šauša, O.
    Iskrová, M.
    Majerník, V.
    Krištiak, J.
    Jesenák, K.
    Vargová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812550.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    The size of nanopores in thermally treated samples of silica aerogels was determined by ortho-positronium lifetime measurements at room temperature. The annealing of samples in the temperature region of 300-800°C does not make substantial changes in pore size felt by positronium. The annealing at higher temperatures from an interval of 800-1050°C causes shrinkage of the samples reducing the pore size to 1-15 nm. The macropores vanish at temperature treatment at 1000°C and the positron annihilation is not affected by oxygen from air.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1517-1522
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Educational concept of eco-management and audit scheme at Slovakian universities
    Koncepcja edukacyjna wdrażania systemu zarządzania środowiskowego na uniwersytetach słowackich
    Autorzy:
    Majernik, M.
    Bosak, M.
    Chovancova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/85201.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    educational concept
    audit scheme
    Slovakia
    university
    environmental management system
    education
    ecological education
    Opis:
    People usually associate the protection of waters with the issue of sewage treatment and with the deployment of new technologies which reduce the consumption of water and waste dumping, while the impact of the society's environmental awareness and of the environmental management upon the effectiveness of water protection generally remains underestimated. Slovakia is located in the catchment area of two seas: the Black Sea and the Baltic Sea; river springs and river upper sections are located on its territory. Therefore, the country attaches great importance to the protection of waters. This, supported with the belief that one of the prerequisites of water protection is proper environmental management, has encouraged the authors of this study to tackle the issue mentioned in the topic. They believe that such management requires qualified personnel to be prepared beforehand. The authors present the recent development of environmental education at Slovakian Universities, mainly at the faculty of mechanical engineering, from the implementation of the first environmentally- oriented subjects to the establishment of an independent department. They describe the contemporary state of education in environmental management and audit scheme (EMAS). They also outline the perspectives for its further development. At the same time, they specify the profile of graduates and the educational plans for particular types, forms and branches of study, as well as the personal and laboratory equipment for the scientific and support of the pedagogical process.
    Ochrona wód kojarzy się zwykle z problemem oczyszczania ścieków oraz zastosowaniem w przemyśle nowych technologii ograniczających zużycie wody i zrzuty ścieków. Wpływ świadomości ekologicznej społeczeństwa i sposobu zarządzania środowiskiem na skuteczność ochrony zasobów wodnych nie są na ogół doceniane. Słowacja, leżąc w zlewisku dwóch mórz – Czarnego i Bałtyckiego – dużą wagę przywiązuje do ochrony wód. Na jej terenie znajdują się źródła oraz górne odcinki rzek. Do podjęcia tematu skłoniło autorów przekonanie, że jednym z podstawowych warunków ochrony wód jest właściwe zarządzania środowiskiem, co z kolei niesie za sobą konieczność przygotowania wykwalifikowanych kadr. Autorzy prezentują najnowszą historię edukacji ekologicznej na uniwersytetach słowackich – głównie w katedrze mechaniki – od wprowadzenia pierwszych przedmiotów o profilu ekologicznym do założenia niezależnego wydziału. Opisują oni obecny stan edukacji w dziedzinie systemu zarządzania środowiskiem i audytu środowiskowego (EMAS). Kreślą oni także perspektywy przyszłego rozwoju. Ponadto określają profil absolwentów oraz plany edukacyjne dla poszczególnych rodzajów, form i działów studiów, jak też sprzęt laboratoryjny wspomagający proces pedagogiczny.
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2007, 11
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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