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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of The New Shape Crushing Plate in Machine Crushing Processes
    Autorzy:
    Ciężkowski, Paweł
    Maciejewski, Jan
    Bąk, Sebastian
    Kwaśniewski, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/178455.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    double-toggle jaw crusher
    crushing process
    crushing plate
    technical performance
    Opis:
    The results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers – plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle γ = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed. The results of the basic process parameters are shown, that is, average degree of fineness n, technical performance Wt, crushing energy L and crushing force F, sieve analysis of crushing product. The obtained results are the basis for the assessment of the suitability of various types of plates, especially plates with a new profile, which have an altered shape in comparison with the plates used in crushers so far. The crushing tests were carried out with the same dimension of outlet slot er = 24 mm, close to the pitch size for plates with triangular profile. Tests were performed on the "Mucharz" sandstone. Samples from a series of blocks of different size and geometric shape were prepared. This work also presents feed mass influence on crushing process efficiency. The plates with variable pitch and width of teeth are beneficial because of lower crushing force and energy.
    Źródło:
    Studia Geotechnica et Mechanica; 2020, 42, 1; 83-96
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Wear Mechanisms of Graphites Used for Crystallisers for Continuous Casting
    Autorzy:
    Brudny, Anna
    Kulasa, Joanna
    Juszczyk, Barbara
    Myalski, Jerzy
    Roskosz, Stanisław
    Wycisk, R.
    Kwaśniewski, Paweł
    Strzępek, Paweł
    Poręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203941.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    wear resistance
    graphite
    crystallizers
    tribology
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    odporność na zużycie
    grafit
    krystalizatory
    tribologia
    Opis:
    This paper presents the results of research concerning the evaluation of tribological properties of graphite materials used, among others, for crystallisers for continuous casting of non-ferrous metals and their alloys. Graphite materials differing not only in their physical properties but also in the technology of their production were selected from a wide range of commercially available products. Wear resistance investigations of the tested graphite materials were carried out on a pin-on-disc tribometer under technically dry friction conditions on a sliding distance of 1000 m. A constant load but variable speed was used in the tests. The mean value of the coefficient of friction and the wear of the material were determined based on the tribological tests carried out. It was observed that as the speed increases, the average value of the coefficient of friction decreases, while the wear increases. A microstructural analysis of the wear track showed that the friction mechanism depends mainly on the graphite formation technology, which is related to the microstructure of the tested materials, and to a lesser extent to their physical and mechanical properties. Varying the speed values made it possible to trace changes in the wear mechanism, on the basis of which it is possible to predict the durability and reliability of graphite crystalliser operation.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 109--115
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pozwólcie żyć narodowi mojemu : Międzynarodowe Forum "Let My People Live!"
    Autorzy:
    Dumin, Ewa.
    Bartoszewski, Władysław.
    Kacaw, Mosze.
    Jan Paweł II (papież ; 1920-2005).
    Putin, Vladimir Vladimirovič (1952- ).
    Kwaśniewski, Aleksander.
    Powiązania:
    Kombatant 2005, nr 2, s. 10-14
    Data publikacji:
    2005
    Tematy:
    Auschwitz-Birkenau (niemiecki obóz koncentracyjny)
    Niemieckie nazistowskie obozy koncentracyjne
    Obchody
    Rocznice
    Ewakuacja
    Opis:
    Zawiera fragm. wystąpień: Władysława Bartoszewskiego, Mosze Kacawa, Jana Pawła II, Władimira Putina, Aleksandra Kwaśniewskiego.
    Fot.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Research on Changes in Microstructures and Mechanical Properties of Welding Caps as a Result of their Usage During Resistance Spot Welding Process
    Autorzy:
    Rdzawski, Zbigniew
    Kwaśniewski, Paweł
    Głuchowski, Wojciech
    Łagoda, Marek
    Maleta, Marcin
    Boczkal, Sonia
    Franczak, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/2203749.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CuCrZr alloy
    resistance spot welding
    mechanical properties
    microanalysis
    tip electrodes
    Opis:
    Mating electrodes made of copper alloys are commonly used for welding galvanized steel sheets used in the production of car bodies. These alloys are characterized by high mechanical properties, a high level of electrical and thermal conductivity as well as the stability of these properties under changing conditions of current, thermal and mechanical load. Much careful attention was paid to the essence of the ongoing structural changes as well as to the mechanical properties in the welding process (RSW - Resistant Spot Welding) of steel sheets, including high-strength ones. There is a lack of research on structural changes and the related mechanical properties occurring in welding electrodes made of copper alloys caused by the welding process. This study is devoted to these issues and contains a critical review of the research results enabling a better understanding of the relationships between the structure and properties of welding electrodes caused by the cyclic welding process. In order to illustrate the phenomena occurring during the welding process, both in the material to be welded and in the tip electrodes, hardness and structural tests were carried out on electrode samples before and after their exploitation. The data collected in the article supplements a certain lack of information in the literature regarding the microstructural aspects of the welding process of galvanized steel sheets for the production of car bodies. The conducted research may be the starting point for the search for more effective materials for the tip electrodes.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 295--306
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the influence of AlTi5B1 modifier on the structure and properties of AlCuMg alloys
    Autorzy:
    Ściężor, Wojciech
    Kowal, Radosław
    Franczak, Krystian
    Grzebinoga, Justyna
    Kwaśniewski, Paweł
    Kiesiewicz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1429801.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    aluminium
    AlCuMg
    modifier
    AlTiB
    casting
    modyfikator
    odlew
    Opis:
    New materials used in various industries require sufficiently high mechanical properties, fine-grained structure and ease of metal forming while minimizing production costs. For this reason, work is being carried out to develop new groups of alloys that make it possible to increase the strength of the obtained components while reducing their weight, and thus reducing production costs. This article focuses on two aluminium-based alloys with different content of alloying additives: copper and magnesium i.e., AlCu3Mg3 and AlCu4.5Mg6, which were produced by metallurgical synthesis. The as-cast alloys were characterized for their basic physical, mechanical and electrical properties and were subjected to structural analysis. In the next stage, the alloys were modified with 100, 500, 1000 and 2000 ppm of titanium and then their hardness, electrical conductivity and density were tested. Samples were also subjected to microstructural analysis. The obtained results allowed to examine the evolution of the AlCuMg alloy properties depending on the content of alloy additives and the amount of used modifier.
    Źródło:
    Acta Innovations; 2021, 38; 37-48
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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