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    Wyświetlanie 1-5 z 5
    Tytuł:
    Pressing Speed, Specific Pressure and Mechanical Properties of Aluminium Cast
    Autorzy:
    Gaspar, S.
    Pasko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382880.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    plunger pressing speed
    specific pressure
    mechanical properties
    odlewanie ciśnieniowe
    nacisk
    właściwości mechaniczne
    Opis:
    Recent research in the process of aluminum alloy die castings production, which is nowadays deeply implemented into the rapidly growing automobile, shipping and aircraft industries, is aimed at increasing the useful qualitative properties of the die casting in order to obtain its high mechanical properties at acceptable economic cost. Problem of technological factors of high pressure die casting has been a subject of worldwide research (EU, US, Japan, etc.). The final performance properties of die castings are subjected to a large number of technological factors. The main technological factors of high pressure die casting are as follows: plunger pressing speed, specific (increase) pressure, mold temperature as well as alloy temperature. The contribution discusses the impact of the plunger pressing speed and specific (increase) pressure on the mechanical properties of the casting aluminum alloy.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Human Factor on Product Quality in Manufacturing Activities
    Autorzy:
    Gruszka, S.
    Gašpar, Š.
    Powiązania:
    https://bibliotekanauki.pl/articles/2065024.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    quality
    product quality
    human resources
    production process
    finished product
    Opis:
    Human factor, often referred to in the literature as human resources, is an important type of resources in an enterprise in ensuring the highest possible quality of products and meeting the needs of customers. The paper presents the question of influence of human factor on the quality of manufacture of the finished product in individual stages of the production process. This problem was presented based on literature analysis and on observations in a production business. Due to the ever-increasing significance of human influence on product quality, this issue is not only very timely, but is constantly being developed.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 851--856
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Interaction between Position of Gate and Selected Properties of Low-Weight Casts on the Silumin Basis
    Autorzy:
    Majernik, J.
    Gaspar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381315.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high pressure die casting
    product development
    mechanical properties
    odlewanie wysokociśnieniowe
    rozwój produktów
    właściwości mechaniczne
    Opis:
    Final quality of casts produced in a die casting process represents a correlation of setting of technological parameters of die casting cycle, properties of alloy, construction of a die and structure of gating and of bleeding systems. Suitable structure of a gating system with an appertaining bleeding system of the die can significantly influence mechanical and structural properties of a cast. The submitted paper focuses on influence of position of outfall of an gate into the cast on its selected quality properties. Layout of the test casts in the die was designed to provide filling of a shaping cavity by the melt with diverse character of flowing. Setting of input technological parameters during experiment remained on a constant level. The only variable was the position of the gate. Homogeneity represented by porosity f and ultimate strength Rm were selected to be the assessed representative quality properties of the cast. The tests of the influence upon monitored parameters were realized in two stages. The test gating system was primarily subjected to numerical tests with the utilization of a simulation program NovaFlow&Solid. Consequently, the results were verified by the experimental tests carried out with the physical casts produced during operation. It was proved that diverse placement of the gate in relation to the cast influences the mode of the melt flowing through the shaping cavity which is reflected in the porosity of the casts. The experimental test proved correlation of porosity f of the cast with its ultimate strength Rm. At the end of the paper, the interaction dependencies between the gate position, the mode of filling the die cavity, porosity f and ultimate strength Rm.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 106-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Reducing the mast vibration of single-mast stacker cranes by gain-scheduled control
    Autorzy:
    Hajdu, S.
    Gáspár, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/331336.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    robust control
    LPV systems
    gain scheduling
    stacker cranes
    sterowanie odporne
    szeregowanie zadań
    układnica
    Opis:
    In the frame structure of stacker cranes harmful mast vibrations may appear due to the inertial forces of acceleration or the braking movement phase. This effect may reduce the stability and positioning accuracy of these machines. Unfortunately, their dynamic properties also vary with the lifted load magnitude and position. The purpose of the paper is to present a controller design method which can handle the effect of a varying lifted load magnitude and position in a dynamic model and at the same time reveals good reference signal tracking and mast vibration reducing properties. A controller design case study is presented step by step from dynamic modeling through to the validation of the resulting controller. In the paper the dynamic modeling possibilities of single-mast stacker cranes are summarized. The handling of varying dynamical behavior is realized via the polytopic LPV modeling approach. Based on this modeling technique, a gain-scheduled controller design method is proposed, which is suitable for achieving the goals set. Finally, controller validation is presented by means of time domain simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 791-802
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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