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    Wyświetlanie 1-6 z 6
    Tytuł:
    Thermal Stresses in the Accessories of Heat Treatment Furnaces vs Cooling Kinetics
    Autorzy:
    Bajwoluk, A.
    Gutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382585.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    application of information technology
    information technology
    grates
    thermal stresses
    heat treatment equipment
    przemysł odlewniczy
    zastosowanie technologii informatycznej
    technologia informatyczna
    ruszty
    naprężenia termiczne
    sprzęt do obróbki cieplnej
    Opis:
    Depending on the course of the processes of heat treatment and thermo-chemical treatment, the technological equipment of heat treatment furnaces is exposed to different operating conditions, as the said processes differ among themselves in the temperature of annealing and atmosphere prevailing in the furnace chamber, in the duration of a single work cycle and in the type and temperature of the coolant. These differences affect the magnitude of stresses occurring in each cycle of the operation of furnace accessories, and thus play an important role in fatigue processes leading to the destruction of these accessories. The kinetics of temperature changes during each cooling process plays an important role in the formation of thermal stresses on the cross-section of the cooled parts. It depends on many factors, including the initial cooling temperature, the type and temperature of the cooling medium, or the dimensions and shape of the object. This article presents a numerical analysis of the effect of the initial temperature on the distribution of stresses on the cross-section of the grate ribs, generated in the first few seconds of the cooling process carried out in two cooling media, i.e. hardening oil and water. The analysis was carried out by the finite element method, based on the results of experimental testes of temperature changes in the rib during its cooling.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 88-93
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cooling Agent on Stress and Deformation of Charge-loaded Cast Pallets
    Autorzy:
    Bajwoluk, A.
    Gutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382504.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    cast grate
    thermal stresses
    heat treatment equipment
    technologia informacyjna
    przemysł odlewniczy
    paleta odlewnicza
    naprężenia cieplne
    obróbka cieplna
    Opis:
    The results of research on the effect of the type of cooling agent used during heat treatment and thermal-chemical treatment on the formation of temperature gradient and stress-deformation distribution in cast pallets, which are part of furnace accessories used in this treatment, are disclosed. During operation, pallets are exposed to the effect of the same conditions as the charge they are carrying. Cyclic thermal loads are the main cause of excessive deformations or cracks, which after some time of the cast pallet operation result in its withdrawal due to damage. One of the major causes of this damage are stresses formed under the effect of temperature gradient in the unevenly cooled pallet construction. Studies focused on the analysis of heat flow in a charge-loaded pallet, cooled by various cooling agents characterized by different heat transfer coefficients and temperature. Based on the obtained temperature distribution, the stress distribution and the resulting deformation were examined. The results enabled drawing relevant conclusions about the effect of cooling conditions on stresses formed in the direction of the largest temperature gradient.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 13-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design Options to Decrease the Thermal Stresses in Cast Accessories for Heat and Chemical Treatment Furnaces
    Autorzy:
    Bajwoluk, A.
    Gutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380577.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    cast grate
    thermal stress
    heat treatment equipment
    technologia informatyczna
    przemysł odlewniczy
    paleta odlewnicza
    naprężenie termiczne
    obróbka cieplna
    Opis:
    By the very nature of their work, castings used in furnaces for heat treatment and thermo-chemical treatment are exposed to the effect of many unfavorable factors causing their deformation and cracking, significantly shortening the lifetime. The main source of damage are the micro-and macro-thermal stresses appearing in each cycle. As the cost of furnace instrumentation forms a significant part of the total furnace cost, in designing this type of tooling it is important to develop solutions that delay the damage formation process and thus extend the casting operation time. In this article, two structural modifications introduced to pallets castings to reduce thermal stresses arising at various stages of the cooling process are proposed. The essence of the first modification consists in making technological recesses in the wall connections, while the aim of the second one is to reduce the stiffness of the pallet by placing expanders in the external walls. Using the results of simulation analyses carried out by the finite element method, the impact of both proposed solutions on the level of thermal stresses was evaluated.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heuristic Model of the Mechanical Properties of a Hypoeutectic EN AC-42100 (EN AC-AlSi7Mg0.3) Silumin Alloy Subjected to Heat Treatment
    Autorzy:
    Górny, Z.
    Kluska-Nawarecka, S.
    Czekaj, E.
    Wilk-Kołodziejczyk, D.
    Saja, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/383182.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    application of information technology
    foundry industry
    silumin alloy
    mechanical properties
    heat treatment
    fuzzy logic
    artificial intelligence
    technologie informatyczne
    zastosowanie technologii informatycznych
    przemysł odlewniczy
    silumin
    właściwości mechaniczne
    obróbka cieplna
    sztuczna inteligencja
    Opis:
    The object of the experimental studies was to determine the mechanical properties of a hypoeutectic EN AC - 42100 (EN ACAlSi7Mg0,3) silumin alloy, where the said properties are changing as a result of subjecting the samples of different types to solution treatment. An important aspect of the studies was the use type of device for the heat treatment. As a basic parameter representing the mechanical properties, the tensile strength of the metal (Rm) was adopted.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 35-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Method to Make Classification of the Heat Treatment Processes Performed on Bronze Using Incomplete Knowledge
    Autorzy:
    Kluska-Nawarecka, S.
    Górny, Z.
    Regulski, K.
    Wilk-Kołodziejczyk, D.
    Jančíková, Z.
    David, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/947501.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    heat treatment
    classification algorithms
    rough sets
    data mining
    technologia informacyjna
    przemysł odlewniczy
    obróbka cieplna
    algorytmy klasyfikacyjne
    zbiory przybliżone
    Opis:
    The article describes the problem of selection of heat treatment parameters to obtain the required mechanical properties in heat- treated bronzes. A methodology for the construction of a classification model based on rough set theory is presented. A model of this type allows the construction of inference rules also in the case when our knowledge of the existing phenomena is incomplete, and this is situation commonly encountered when new materials enter the market. In the case of new test materials, such as the grade of bronze described in this article, we still lack full knowledge and the choice of heat treatment parameters is based on a fragmentary knowledge resulting from experimental studies. The measurement results can be useful in building of a model, this model, however, cannot be deterministic, but can only approximate the stochastic nature of phenomena. The use of rough set theory allows for efficient inference also in areas that are not yet fully explored.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 69-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of melting process of thin metal films subjected to the short laser pulse
    Autorzy:
    Majchrzak, E.
    Dziatkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380460.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    techniki numeryczne
    wymiana ciepła
    proces topienia
    metoda różnic skończonych
    information technology
    foundry industry
    numerical techniques
    micro scale heat transfer
    melting process
    finite difference method
    Opis:
    Thin metal film subjected to a short-pulse laser heating is considered. The parabolic two-temperature model describing the temporal and spatial evolution of the lattice and electrons temperatures is discussed and the melting process of thin layer is taken into account. At the stage of numerical computations the finite difference method is used. In the final part of the paper the examples of computations are shown.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 105-108
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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