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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of parameters of high-pressure die casting on occurrence of casting nonconformities in sleeves of silumin alloy EN AB 47100
    Autorzy:
    Pałyga, Ł.
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352331.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-pressure die casting
    casting nonconformities
    structure
    silumin
    microhardness
    Opis:
    The paper presents a research on the effect of extreme - for the technology of the considered silumin EN AB 47100 - parameters of high-pressure die casting on occurrence of casting nonconformities. Considered was influence of the way of assembling the mould cooled-down to 140-160°C, non-standard for the selected casting, and pouring temperature in the range of 705 to 720°C (higher than the recommended) of non-refined alloy. The castings were prepared with use of a high-pressure casting machine made by Kirov with mould closing force of 2500 kN. Occurrence of nonconformities was evaluated on properly prepared specimens taken from the castings manufactured with various parameters of the injection piston and various multiplication pressures. The results were subjected to quantitative and qualitative analyses of casting nonconformities and distribution of major alloying elements. It was found that proper selection of working parameters of the casting machine, in spite of disadvantageous pouring conditions, makes it possible to reduce occurrence of some casting defects, like shrinkage cavities and porosity, to improve tightness of castings even when the alloy refining process is omitted.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 373-378
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting
    Autorzy:
    Braszczyńska-Malik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/383025.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloys Mg-Al-RE
    high-pressure die casting
    stopy magnezu Mg-Al-RE
    odlewanie wysokociśnieniowe
    Opis:
    Experimental Mg-Al-RE type magnesium alloys for high-pressure die-casting are presented. Alloys based on the commercial AM50 magnesium alloy with 1, 3 and 5 mass % of rare earth elements were fabricated in a foundry and cast in cold chamber die-casting machines. The obtained experimental casts have good quality surfaces and microstructure consisting of an α(Mg)-phase, Al11RE3, Al10RE2Mn7 intermetallic compound and small amount of α+γ eutectic and Al2RE phases.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 49-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Defects on Deformation Behavior of High-Pressure Die-Casting Magnesium Alloys
    Autorzy:
    Braszczyńska-Malik, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/27314146.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    magnesium alloy
    high-pressure die casting
    gas porosity
    shrinkage porosity
    microstructure
    deformations
    stop magnezu
    odlewanie wysokociśnieniowe
    porowatość gazowa
    porowatość skurczowa
    mikrostruktura
    deformacje
    Opis:
    The results of investigations of defects in AME-series magnesium alloys produced by the high-pressure die-casting method are presented. The analyzed magnesium alloys contain about 5 wt% aluminum and 1-5 wt% rare earth elements introduced in the form of mischmetal. The casts were fabricated using a regular type cold-chamber high-pressure die-casting machine with a 3.2 MN locking force. The same surfaces of the casts were analyzed before and after the three-point bending test in order to determine the influence of the gas and shrinkage porosity on the deformation behavior of the alloys. The obtained results revealed that the most dangerous for the cast elements is the shrinkage porosity, especially stretched in the direction perpendicular to the that of the tensile stress action. Additionally, the influence (Mg) solid solution and its interaction on the cracking process was described [alpha] of deformation twins arise in the dendrites of the primary.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 10--14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting
    Autorzy:
    Matejka, Marek
    Bolibruchowá, Dana
    Podprocká, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203939.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    high-pressure die casting
    porosity
    Brinell hardness
    microstructure
    stop Al-Si-Cu
    odlewanie wysokociśnieniowe
    porowatość
    twardość Brinella
    mikrostruktura
    Opis:
    High-pressure die casting results in a high quality surface and good mechanical properties of castings. Under the effect of pressure, integral and solid castings are achieved without a large number of foundry defects. The correct and proper setting of technological parameters plays a very important role in minimizing casting defects. The aim of the presented article is to determine the optimum maximum piston velocity for a casting in the high-pressure casting process with two height variants, depending on their internal quality. It is because the internal quality of particular castings is important in terms of proper functionality in operations where the biggest problem is the porosity of the casting. The main cause of porosity formation is the decreasing solubility of gases (most often hydrogen) during the melt solidification. Solubility represents the maximum amount of gas that can dissolve in a metal under equilibrium conditions of temperature and pressure. Macroporosity and microporosity were determined from the sections of the surfaces in the determined zones of the castings. Here, the results was that the macroporosity decreased with increasing piston velocity. Ideal microstructure was evaluated at a piston velocity of 3 m/s for both types of castings. On the other hand, the increase in tube size has shown that velocities of 3 m/s and higher, the tube is more prone to macroporosity formation. The highest hardness was achieved at the piston velocity of 2 m/s at both tube lengths.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 34--40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wtrąceń niemetalicznych w odlewach ze stopu AZ91 wykonanych z udziałem złomu obiegowego w procesie wysokociśnieniowego odlewania
    Analysis of non-metallic inclusions in AZ91 alloy casts with process foundry return in high-pressure die casting
    Autorzy:
    Konopka, Z.
    Chojnacki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/391510.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    odlewanie ciśnieniowe
    stop AZ91
    wtrącenia niemetaliczne
    mikrostruktura
    złom obiegowy
    high-pressure die casting
    alloy AZ91
    non-metallic inclusions
    microstructure
    process foundry return
    Opis:
    W artykule przedstawiono wyniki badań wpływu udziału złomu obiegowego we wsadzie stopu AZ91 na zmianę struktury odlewów wykonanych metodą wysokociśnieniowego odlewania, ze szczególnym uwzględnieniem tworzenia się wtrąceń niemetalicznych. Na podstawie obserwacji wtrąceń metodą mikroskopii skaningowej określono skład chemiczny tych wtrąceń w wytopach z różnym udziałem złomu obiegowego we wsadzie.
    The article presents research results of the process foundry return influence in the AZ91 alloy charge on the change in the structure of castings made by the high-pressure casting method, with special consideration of the formation of non-metallic inclusions. Based on the observations of inclusions by the scanning microscopy method, the chemical composition of the inclusions in melts with different process scrap contents in the charge was determined.
    Źródło:
    Prace Instytutu Odlewnictwa; 2016, 56, 4; 321-328
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of plunger motion profile of high pressure die casting on the casting porosity and solidification rate
    Autorzy:
    Żak, Katarzyna
    Dańko, Rafał
    Żak, Paweł L.
    Kowalczyk, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/27311424.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    high-pressure die casting
    computer simulation
    cooling rate
    numerical methods
    aluminium alloy
    odlewanie pod wysokim ciśnieniem
    symulacja komputerowa
    tempo schładzania
    metody numeryczne
    stop aluminium
    Opis:
    The high pressure die casting (HPDC) is a technique that allows us to produce parts for various sectors of industry. It has a great application in such sectors as automotive, energy, medicine, as the HPDC allows us to produce parts very fast and very cheaply. The HPDC casting quality depends on many parameters. The parameters among others, are cast alloy alloy metallurgy, filling system design, casting technology elements geometry and orientation, as well as, machine operation settings. In the article, different plunger motion schemes of the HPDC machine were taken into account. Analyses lead to learning about plunger motion influence on the casting porosity and solidification process run. Numerical experiments were run with the use of MAGMASoft® simulation software. Experiments were performed for industrial casting of water pump for automotive. Main parameter taken into account was maximal velocity of the plunger in the second phase. The analysis covered porosity distribution, feeding time through the gate, temperature field during whole process, solidification time. Cooling curves of the casting in chosen points were also analysed. Obtained results allow us to formulate conclusions that connect plunger motion scheme, gate solidification time and the casting wall thickness on the solidification rate and porosity of the casting.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e147339
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Microstructure and Porosity Formation in High-Pressure Die-Casting
    Autorzy:
    Matejka, Marek
    Bolibruchová, D.
    Podprocká, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126896.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    high-pressure die casting
    returnable material
    numerical simulation
    porosity
    microstructure
    stop Al-Si-Cu
    odlewanie wysokociśnieniowe
    odzysk materiału
    symulacja numeryczna
    porowatość
    mikrostruktura
    Opis:
    The technology of high-pressure die-casting (HPDC) of aluminum alloys is one of the most used and most economical technology for mass production of castings. High-pressure die-casting technology is characterized by the production of complex, thin-walled and dimensionally accurate castings. An important role is placed on the effective reduction of costs in the production process, wherein the combination with the technology of high-pressure die-casting is the possibility of recycling using returnable material. The experimental part of the paper focuses on the analysis of a gradual increase of the returnable material amount in combination with a commercial purity alloy for the production of high-pressure die-castings. The returnable material consisted of the so-called foundry waste (defective castings, venting and gating systems, etc.). The first step of the experimental castings evaluation consisted of numerical simulations, performed to determine the points of the casting, where porosity occurs. In the next step, the evaluation of areal porosity and microstructural analysis was performed on experimental castings with different amounts of returnable material in the batch. The evaluation of the area porosity showed only a small effect of the increased amount of the returnable material in the batch, where the worst results were obtained by the casting of the alloy with 90% but also with 55% of the returnable material in the batch. The microstructure analysis showed that the increase in returnable material in the batch was visibly manifested only by a change in the morphology of the eutectic Si.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 127--130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lost Cores for High-Pressure Die Casting
    Autorzy:
    Jelinek, P.
    Adámková, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379956.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    product development
    salt cores
    high-pressure die casting
    squeezing-injection
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    rozwój produktów
    odlewnictwo wysokociśnieniowe
    rdzeń
    Opis:
    Development of salt cores prepared by high-pressure squeezing and shooting with inorganic binders has shown a high potential of the given technology even for high-pressure casting of castings. Strength, surface quality of achieved castings, and solubility in water become a decisive criterion. The shape and quality of grain surface particularly of NaCl – cooking salts that can be well applied without anticaking additives has shown to be an important criterion. Thus the salt cores technology can cover increasingly growing demands for casting complexity especially for the automobile industry.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 101-104
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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