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Wyszukujesz frazę "thermal treatment" wg kryterium: Temat


Wyświetlanie 1-3 z 3
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:
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
    Wyświetlanie 1-3 z 3

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