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Tytuł:
Hot Tearing, Parameters, and Mould Types for Observation – Review
Autorzy:
Akhyar
Powiązania:
https://bibliotekanauki.pl/articles/2127511.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting defects
pouring temperature
mould temperature
mould types
wady odlewnicze
temperatura wylewu
temperatura formy
typ form
Opis:
Hot tearing is a casting defect responsible for external and internal cracks on casting products. This irregular undesired formation is often observed during solidification and freezing. The solidification of molten metal also causes thermal contraction and shrinkage, indicating the occurrence of hot tearing when the alloy is restrained by the mould design. The parameters affecting this process include the pouring and mould temperatures, the chemical composition of the alloy, and the mould shape. Also, the factors affecting hot tearing susceptibility include pouring and mould temperatures, the grain refiner, as well as pouring speed. There are many methods of measuring the level of susceptibility to hot tearing, one of which is the thermal contraction evaluation during metal solidification, observed in cast products through several mould types. This paper discusses the hot tearing overview, the effect of pouring temperature, mould temperature, grain refiner, pouring speed on hot tearing, the type of mould, and criterion for hot tear observation.
Źródło:
Archives of Foundry Engineering; 2022, 22, 2; 25--49
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of pouring temperature on the mechanical properties of Al5.9Cu1.9Mg alloy
Autorzy:
Akhyar, Akhyar
Iswanto, P.T.
Malau, V.
Powiązania:
https://bibliotekanauki.pl/articles/2201133.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
mechanical properties
Al-Cu-Mg alloy
casting metal
pouring temperature
właściwości mechaniczne
Stop Al-Cu-Mg
metal odlewniczy
temperatura odlewania
Opis:
Purpose: This experiment aims to determine the influence of pouring temperature on the hardness, impact energy, tensile strength, and changes in the microstructure of the Al-5.9Cu- 1.9Mg alloy. Design/methodology/approach: A total of three samples of aluminium alloy were heated to 688, 738, and 788°C, and poured into permanent moulds in form of plates at a constant temperature of 220°C. The cast products are machined according to testing standards for hardness, impact tests, and tensile strength. Findings: The results showed that the metal hardness and impact energy increased to 103 BHN and 7.48 J at 788°C, respectively, while the tensile strength rises as the temperatures decreases. Furthermore, the changes in the microstructure were affected, which indicated that all the properties of the aluminium alloy were influenced by the variations in temperature. Research limitations/implications: During the metal casting process, only three different pouring temperatures affected the properties of the metal alloy, therefore, there is a need for more variations. Practical implications: The proposed pouring temperature parameter is an important condition for industrial foundry applications to obtain the right product for use in a machining element. Originality/value: This research shows the influence of the difference in pouring temperatures on the properties of metal alloys due to casting, where they will be adapted for a particular use.
Źródło:
Archives of Materials Science and Engineering; 2022, 113, 2; 49--55
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Ladle Tilting Speed for Preventing Temperature Drops in the Die Casting Process
Autorzy:
Ando, Haru
Minamide, Daichi
Takagi, Yuto
Yano, Ken’ichi
Nakamura, Naoto
Sano, Masahiro
Aoki, Takahiro
Nemoto, Yasunori
Powiązania:
https://bibliotekanauki.pl/articles/2172385.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
temperature drop
die casting
optimization
pouring
ladle tilt
Opis:
In die casting, molten metal poured into a shot sleeve is pressed into a mold by a plunger at high speed. The temperature of the metal drops significantly while it is being poured from the ladle to the shot sleeve, resulting in casting defects such as misrun flow lines. Although it is important to control the temperature at all stages of the process, a method for minimizing temperature loss has not yet been clarified to date. In this study, the cause of the temperature drop in the shot sleeve was clarified, and a method of optimizing the ladle tilting speed was proposed to prevent temperature drop. First, experiments were conducted to measure the decrease in metal temperature in the sleeve during pouring. These experiments revealed that the metal cools significantly from the moment it touches the shot sleeve. Therefore, the time from the first contact between the shot sleeve and the metal to the start of pouring was set as the objective function. A genetic algorithm was then used to derive the optimal ladle tilting speed pattern to suppress the temperature drop. This analysis confirmed that the metal was poured without flowing out or running ahead and that the immediate liquid level vibration after pouring was suppressed, thus ensuring stable pouring.
Źródło:
Journal of Casting & Materials Engineering; 2022, 6, 4; 69--75
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Heat Engineering Parameters of Casting and Rolling Complexes Work
Autorzy:
Biryukov, A.
Ivanova, A.
Powiązania:
https://bibliotekanauki.pl/articles/381410.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
casting-rolling machine
ingot heating device
temperature field
heat flux
odlewanie ciągłe
urządzenie grzewcze
pole temperatury
strumień ciepła
Opis:
The paper consists the problem of developing a scientific toolkit allowing to predict the thermal state of the ingot during its formation in all elements of the casting and rolling complex, between the crystallizer of the continuous casting machine and exit from the furnace. As the toolkit for the decision making task the predictive mathematical model of the ingot temperature field is proposed. Displacement between the various elements of the CRC is accounted for by changing the boundary conditions. Mass-average enthalpy is proposed as a characteristic of ingot cross-section temperature state. The next methods of solving a number of important problems with the use of medium mass enthalpy are developed: determination of the necessary heat capacity of ingots after the continuous casting machine for direct rolling without heating; determination of the rational time of alignment of the temperature field of ingots having sufficient heat capacity for rolling after casting; determination of the total amount of heat (heat capacity) required to supply the metal for heating ingots that have insufficient amount of internal heat.
Źródło:
Archives of Foundry Engineering; 2019, 3; 11-14
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Superheat Temperature on the Slab Structure in the Continuous Steel Casting Process
Autorzy:
Drożdż, P.
Powiązania:
https://bibliotekanauki.pl/articles/354782.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
superheat temperature
continuous casting of steel
ProCAST
Opis:
The temperature of liquid steel for continuous casting determines the casting speed and cooling conditions. The failure to meet the required casting process parameters may result in obtaining slabs of inconsistent quality. Numerical methods allow forreal processes to be modelled. There are professional computer programs on the market, so the results of the simulations allow us to understand the processes that occur during casting and solidification of a slab. The study attempts to evaluate the impact of the superheat temperature on the slab structure based on the industrial operating parameters of the continuous casting machine.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1287-1293
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Wall Thickness and Mould Temperature on Structure and Properties of Thin Wall Ductile Iron Castings
Autorzy:
Górny, M.
Kawalec, M.
Witek, G.
Rejek, A.
Powiązania:
https://bibliotekanauki.pl/articles/382589.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
mechanical properties
ductile iron
austenitic ductile iron
high Ni alloying
mould temperature
thin wall casting
metalografia
właściwości mechaniczne
metal ciągliwy
żeliwo sferoidalne
Opis:
The excellent property combination of thin wall ductile iron castings (TWDI), including thin wall alloyed cast iron (e.g. austenitic TWDI) has opened new horizons for cast iron to replace steel castings and forgings in many engineering applications with considerable cost benefits. TWDI is considered as a potential material for the preparation of light castings with good mechanical and utility properties, the cost of which is relatively low. In this study, unalloyed and high Ni-alloyed (25% Ni) spheroidal graphite cast iron, with an austenitic metallic matrix were investigated. The research was conducted for thin-walled iron castings with 2, 3 and 5mm wall thickness, using different mould temperature (20°C, and 160°C) to achieve various cooling rates. The metallographic examinations i.e. characteristic of graphite nodules, metallic matrix, and primary grains of austenite dendrites (in high-nickel NTWDI) and mechanical properties were investigated. The study shows that homogeneity of the casting structure of thin-walled castings varies when changing the wall thickness and mould temperature. Finally, mechanical properties of thin-walled ductile iron castings with ferritic-pearlitic and austenitic metallic matrix have been shown.
Źródło:
Archives of Foundry Engineering; 2019, 2; 55-59
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on New Al-Ag-Mo Alloys Dedicated to Wire Applications in Overhead Power Lines
Autorzy:
Grzebinoga, Justyna
Mamala, Andrzej
Ściężor, Wojciech
Kowal, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2201984.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
aluminum
silver
molybdenum
continuous casting
drawing
wire
conductivity
thermal resistance
temperature coefficient of resistance
rheological properties
HTLS conductors
Opis:
The latest research work in the field of electric power systems focuses on the development of new wire materials which will allow the increase of the transmission capacity of power lines currently in use. The reason for this research was the often limited possibilities of continuous and failure-free transmission of electricity. In this paper, the authors present research on a new aluminium-based alloy dedicated for use as a conductive braid in the HTLS cable group. There are many technical solutions for this group of cables on the market, although they are solutions with a number of disadvantages, ranging from their high price, various operational shortcomings, complicated installation techniques, and ending with the risk of monopolistic practices, which is related to the inability to attract several competitive suppliers. The main aim of the research was to develop a new alloy based on aluminium with the addition of silver and molybdenum dedicated for use in special overhead power cables. Experimental research on new materials focused on obtaining the necessary knowledge to produce an overhead wire from these alloys with higher current carrying capacity in relation to the currently used conventional wire materials based on aluminium.
Źródło:
Journal of Casting & Materials Engineering; 2023, 7, 1; 9--14
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of phase-change boundary position in continuous casting
Autorzy:
Ivanova, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/380559.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
information technology
foundry industry
mathematical modeling
temperature distribution
Stefan condition
phase change boundary
continuous casting
krzepnięcie stopu
technologia informacyjna
przemysł odlewniczy
modelowanie matematyczne
rozkład temperatury
warunek Stefana
granica międzyfazowa
odlewanie ciągłe
Opis:
The problem of determination of the phase-change boundary position at the mathematical modeling of continuous ingot temperature field is considered. The description of the heat transfer process takes into account the dependence of the thermal physical characteristics on the temperature, so that the mathematical model is based on the nonlinear partial differential equations. The boundary position between liquid and solid phase is given by the temperatures equality condition and the Stefan condition for the two-dimensional case. The new method of calculation of the phase-change boundary position is proposed. This method based on the finite-differences with using explicit schemes and on the iteration method of solving of non-linear system equations. The proposed method of calculation is many times faster than the real time. So that it amenable to be used for model predictive control of continuous semifinished product solidification.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 57-62
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of increased temperature on dimensional and shape accuracy of castings produced from the EN AC-AlSi11 alloy by pressure die casting process
Autorzy:
Jarco, A.
Powiązania:
https://bibliotekanauki.pl/articles/353899.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high pressure die casting
Al-Si alloy
blistering
dimensional accuracy
shape accuracy
elevated temperature behavior
Opis:
The present work discusses results of increased temperature on shape-dimensional changes of a 110 type hose coupling, produced from EN AC-AlSi11 alloy with the use of pressure die casting technology. The castings were soaked for 3.5 h at temperatures 460°C, 475°C and 490°C. The verification of shape-dimensional accuracy of the elements after soaking treatment, in relation to raw casting, was carried out by comparing the 3D models received from 3D scanning. Soaking temperature of about 460°C-475°C results in no significant changes in the shapes and dimensions of the castings, or surface defects in the form of blisters, which can be seen at a temperature of 490°C.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 325-328
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of protruding rebar from casting element on temperature development and compressive strength of mass concrete
Wpływ wystającego z elementu betonowego zbrojenia na rozwój temperatury i wytrzymałość na ściskanie betonu w czasie jego dojrzewania
Autorzy:
Kaszyńska, M.
Skibicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/230546.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wytrzymałość na ściskanie
temperatura
dojrzewanie
beton samozagęszczalny
pręt zbrojeniowy wystający
konstrukcja masywna
compressive strength
temperature
casting
self-consolidating concrete
protruding rebar
massive structure
Opis:
The influence of rebar, protruding from concrete element during casting, on temperature and strength development was analyzed. Test models of size 50 cm x 50 cm x 50 cm were made with and without protruding rebar. The rebar protruding from the sample simulated the conditions of the hardening of elements such as bridge abutments or pylons, which require technological break. Samples were cast in insulated formworks, to create semi-adiabatic conditions for concrete curing, simulating real conditions of curing of mass structures. The research utilized selfconsolidating concrete with two different rapid hardening cements: CEM I 42.5R and CEM I 52.5R, and blastfurnace cement CEM III/A 42.5N. Continuous registration of temperatures in the samples was performed for the first 7 days. Based on the results acquired and compressive strength, the amount and kinetics of the heat given off in the concrete was determined and an evaluation of its strength in conditions simulating actual conditions was performed. The research showed that the difference in temperature between the reinforced and non-reinforced sample was approximately 14.0° C.
W artykule przeanalizowano wpływ wystającego z elementu betonowego zbrojenia na rozwój temperatury i wytrzymałości betonu na ściskanie podczas wznoszenia konstrukcji. Wystające zbrojenie może symulować warunki panujące podczas betonowania takich elementach jak przyczółki mostowe czy pylony. Celem badań było ustalenie zależności między ilością generowanego ciepło i wczesną wytrzymałością na ściskanie dla samozagęszczalnych betonów dojrzewających w konstrukcjach masywnych. Wyniki badań mogą być wykorzystane przy opracowaniu technologii betonowania w budownictwie mostowym. W ramach badań wykonano w zaizolowanych termicznie systemowych szalunkach próbki o wymiarach 50 cm x 50 cm x 50 cm z wystającym z konstrukcji zbrojeniem (symulujące element podczas przerwy roboczej) oraz element referencyjny bez zbrojenia. Zastosowane pręty zbrojeniowe miały średnicę 2 cm i długość 80 cm. Jeden koniec pręta znajdował się 20 cm od dna szalunku i wystawał 33 cm ponad jego górną izolację termiczną. W próbce znajdowało się 36 równomiernie rozłożonych prętów zbrojeniowych, co daje stopień zbrojenia równy 4.5%. Temperatura była mierzona podczas dojrzewania betonu za pomocą termopary typu T osadzonej w betonie. Termopary były przymocowane do zbrojenia. Natomiast w próbce niezbrojonej termopary były umieszczone w betonie za pomocą specjalnego zaizolowanego pręta. Temperatura była mierzona przez 7 dni w 5 minutowym interwale czasowym, za pomocą aparatury ConReg 706. Próbka zbrojona i niezbrojona podczas badania były wykonane w tym samym czasie. Termopary były umieszczone w szalunku i podłączone do aparatury pomiarowej przed rozpoczęciem badania. Temperatura wewnątrz próbki była mierzona w trzech punktach: w środku próbki (punkt 1), 5 cm od bocznej krawędzi (punkt 2) oraz 5 cm od górnej krawędzi (punkt 3).
Źródło:
Archives of Civil Engineering; 2020, 66, 2; 211-233
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of susceptibility to hot cracking of magnesium alloy joints in variable stiffness condition
Ocena skłonności do pękania gorącego spoin naprawczych odlewów ze stopów magnezu w warunkach zmiennej sztywności
Autorzy:
Kierzek, A.
Adamiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/351585.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spawalność stopu magnezu
temperatura kruchości
pękanie gorące
spoiny naprawcze
próba Houldcrofta
weldability of magnesium alloy
brittleness temperature range
hot cracking
repair casting
Houldcroft test
Opis:
Magnesium alloys, due to their low density and advantageous resistance properties, are being increasingly used in automotive and aircraft industries. It is connected with the desire for vehicles mass lowering and fuel consumption decreasing. One of the development directions of magnesium alloys is the increase of creep resistance, which allows for usage at higher temperatures. The following property is possible to acquire thanks to alloy additions such as: rare-earth elements and zirconium. Almost 90% of used magnesium alloys are casting alloys: precision castings are most frequently used in automotive industry and gravity ones in aircraft industry. After the process of casting, some defects can be visible in the material, e.g. misruns or microshrinkages, but they are repaired with the use of overlay welding and other welding techniques. The main criteria of magnesium alloys weldability assessment is their susceptibility to hot cracking, which constitute the greatest difficulty during welding, and their overlay welding capacity. This paper presents the evaluation of the influence of technological factors on magnesium alloys susceptibility to hot cracking. For that purpose, several tests of joint welding in variable stiffness conditions (Houldcroft test) and metallographic examination had been made. The examination was carried out on three magnesium alloys suitable to work at elevated temperatures: ZRE1, WE43 and MSRB and, for comparison, on the most frequently used for gravity castings - AZ91 alloy, in cast state and for two alternatives of heat treatment.
Stopy magnezu, dzięki swojej niskiej gęstości i korzystnym właściwościom wytrzymałościowym znajdują coraz większe zastosowanie w przemyśle motoryzacyjnym i lotniczym. Jest to związane z dążeniem do obniżenia masy pojazdów oraz ze zmniejszeniem zużycia paliwa. Jednym z kierunków rozwoju stopów magnezu jest zwiększenie odporności na pełzanie, co umożliwi stosowanie wyższych temperatur eksploatacji. Właściwość tę uzyskuje się poprzez dodatki stopowe takie jak: pierwiastki ziem rzadkich oraz cyrkon. Prawie 90% stosowanych stopów magnezu to stopy odlewnicze, po procesie odlewania w materiale mogą pojawić się niedolania i rzadzizny. Wady te naprawiane są z zastosowaniem technik napawania i spawania. W trakcie spawania stopów magnezu wykazują one skłonność do pękania na gorąco. Pęknięcia gorące powstają w zakresie kruchości wysokotemperaturowej. Dlatego też głównym kryterium oceny spawalności stopów magnezu jest ich skłonność do pękania na gorąco. W pracy przedstawiono ocenę wpływu czynników technologicznych na skłonność do pękania gorącego stopów magnezu. W tym celu przeprowadzono prý spawania w warunkach zmiennej sztywności złącza oraz wykonano badania metalograficzne. Próbę Houldcrofta wykonano na popularnym stopie AZ91 z dodatkiem cynku i aluminium oraz stopach o zwiększonej odporności na pełzanie: ZRE1, WE43 oraz MSRB, dla dwóch wariantów obróbki cieplnej oraz w stanie lanym.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 3; 759-767
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of heat accumulation coefficient for oil bonded moulding sands
Autorzy:
Łągiewka, M.
Konopka, Z.
Zyska, A.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/379643.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theoretical basis
casting processes
moulding material
oil binder
heat accumulation coefficient
moulding sand
temperature equalization coefficient
podstawy teoretyczne
proces odlewniczy
materiał formierski
spoiwo olejowe
współczynnik akumulacji ciepła
masa odlewnicza
Opis:
The possibility of controlling the solidification and cooling time of castings creates prospects of improving their structure and by the same their properties. Thermal properties of the mould constitute therefore an important factor which is necessary to consider while seeking for the mentioned improvement. The presented work illustrates the method of determining some basic thermal coefficients of moulding material, i.e. the coefficient of temperature equalisation a2, known also as the temperature diffusivity, and the heat accumulation coefficient b2, which characterises the ability of moulding material to draw away the heat from a casting. The method consists in experimental determining the temperature field within the mould during the processes of pouring, solidification and cooling of the casting. The performed measurements allow for convenient and exact calculations of the sought-after coefficients. Examinations were performed for the oil bonded moulding sand of trade name OBB SAND ‘E’. The experiment showed that the obtained value of b2 coefficient differs from the value calculated on the basis of theoretical considerations available in publications. Therefore it can be stated that theoretical calculations of the heat accumulation coefficient are thus far not sufficient and not quite reliable, so that these calculations should be verified experimentally.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 91-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of the Thermal Process in Ladle Metallurgy in Terms of the Impact on Energy Consumption and the Environmental Burden During Steel Production
Autorzy:
Lampa, Martin
Mokrošová, Lenka
Powiązania:
https://bibliotekanauki.pl/articles/2174906.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
casting ladle
ladle furnace
extra-furnace processing
lining
energy consumption
ecological burden
steel production
continuous casting
high-temperature heating
Opis:
The paper focuses on reducing the energy intensity of ladle metallurgy as part of steel production and the associated reduction of pollutant emissions. It can be achieved by optimising the thermal work of metallurgical aggregates in terms of the impact on energy consumption and the environmental burden of steel production. It is about minimising the heat loss of liquid steel in the casting ladle throughout the entire process, from the melting equipment, through the extra-furnace processing, to the continuous casting of the steel.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 246--259
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Temperature Field, Heat and Fluid Flow of Two-Phase Zone Continuous Casting Cu–Sn Alloy Wire
Autorzy:
Luo, J.
Liu, X.
Wang, X.
Powiązania:
https://bibliotekanauki.pl/articles/380230.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
two-phase zone continuous casting
alloy Cu-Sn
numerical simulation
temperature field
heat flow
fluid flow
odlewanie ciągłe
strefa odlewania dwufazowego
stop Cu-Sn
symulacja numeryczna
pole temperatury
przepływ ciepła
przepływ płynu
Opis:
Cu–4.7 wt. % Sn alloy wire with Ø10 mm was prepared by two-phase zone continuous casting technology, and the temperature field, heat and fluid flow were investigated by the numerical simulated method. As the melting temperature, mold temperature, continuous casting speed and cooling water temperature is 1200°C, 1040°C, 20 mm/min and 18°C, respectively, the alloy temperature in the mold is in the range of 720°C–1081°C, and the solid/liquid interface is in the mold. In the center of the mold, the heat flow direction is vertically downward. At the upper wall of the mold, the heat flow direction is obliquely downward and deflects toward the mold, and at the lower wall of the mold, the heat flow deflects toward the alloy. There is a complex circular flow in the mold. Liquid alloy flows downward along the wall of the mold and flows upward in the center.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 33-40
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
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