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    Wyświetlanie 1-13 z 13
    Tytuł:
    An Evaluation of the Effect of Ultrasonic Degassing on Components Produced by High Pressure Die Casting
    Autorzy:
    Silva da, Manel
    Bajusz, Attila
    Pabel, Thomas
    Petkov, Tose
    Plantà, Xavier
    Powiązania:
    https://bibliotekanauki.pl/articles/1445070.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    aluminium alloy
    casting
    HPDC
    degassing
    ultrasonic treatment
    hydrogen
    Opis:
    Ultrasonic treatment is known to be efficient for aluminium melt degassing with the additional benefits of being both economical and environment friendly. This paper describes the effect of ultrasonic degassing on the preparation of an AlSi9Cu3(Fe) alloy for High Pressure Die Casting (HPDC). The degassing efficiency was assessed in terms of the indirect evaluation of the melt, by means of the reduced pressure test and the porosity evaluation of the cast parts. Additionally, the corresponding hydrogen content was estimated with an experimental equation reported in the literature. Ultrasonic degassing shows greater efficiency in terms of hydrogen removal from the melt than conventional N2 + Ar lance bubbling. Components produced by HPDC without degassing, with ultrasonic degassing and with lance degassing, were analysed by computed tomography and by metallography. The results show that the components produced by HPDC after ultrasonic degassing have a similar porosity level to components degassed with conventional lance bubbling, both showing an important improvement over components produced without degassing treatment. Hardness values were similar for all different treatment conditions and well over the minimum value established for the alloy by the corresponding standard.
    Źródło:
    Journal of Casting & Materials Engineering; 2020, 4, 4; 58-64
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Focus on development of quality, high pressure die casting process
    Autorzy:
    Peter, I.
    Rosso, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354404.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    numerical simulations
    die casting
    development of casting technology
    HPDC optimization
    Opis:
    In contemporary high-pressure die casting foundries, the mastery of each sequence in the production cycle is more and more important. In the paper, an example of virtual analysis of gearbox casting from Al alloy will be presented. It includes a large variety of parameters, as follows: choosing of appropriate foundry technology, calculation of computer simulation of casting process which takes into account the filling process of cold chamber and filling of cavity, model description of three phases in high-pressure die casting, flow of molten metal, solidification, formation of stress and deformations. Additionally, the optimization of cooling and heating systems will be compared with calculated volume defects, dimensions of castings and their deformations with experimentally obtained values.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 125-128
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection of the Technological Ceramic Layer Thickness in an HPDC Machine Plunger in the Aspect of its Strength
    Autorzy:
    Jankowski, Jacek
    Kołakowski, Dariusz
    Pisarek, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/102039.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    plungers
    HPDC machine
    thermal stresses
    axially symmetrical thermal stress state
    tłoki
    maszyna HPDC
    naprężenia termiczne
    stan naprężenia termicznego symetryczny osiowo
    Opis:
    A way of selecting the ceramic coating thickness concerning the axially symmetrical thermal stresses in a casting machine plunger with a horizontal shot sleeve was discussed. Application of a technological ceramic outer layer in the plunger enhances its tribological properties. The condition that stresses in tension in the outer ceramic layer are lower than the tensile strength was proposed as a selection criterion.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 4; 11-20
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM/TEM Investigation of Degradation of Bi-Layer (Cr,Al)N/Cr2N3 Duplex Coatings Exposed to AlSi Alloy High Pressure Die Casting Cycles
    Autorzy:
    Wilczek, A.
    Morgiel, Jerzy
    Sypień, Anna
    Pomorska, Małgorzata
    Rogal, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2174589.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex coatings
    CrN/Cr2N/(CrN/CrAIN)/CrAlN
    SEM
    TEM
    HPDC
    Opis:
    High pressure die casting (HDPC) allows to produce aluminum parts for car industry of complicated shapes in long series. Dies used in this process must be robust enough to withstand long term injection cycling with liquid aluminum alloys, as otherwise their defects are imprinted on the product making them unacceptable. It is expected that nitriding followed by coating deposition (duplex treatment) should protect them in best way and increase intervals between the cleaning/repairing operations. The present experiment covered investigations of the microstructure of the as nitride and deposited with CrAlN coating as well as its shape after foundry tests. The observations were performed with the scanning and transmission electron microscopy (SEM/TEM) method. They showed that the bottom part of this bi-layer is formed by roughly equi-axed Cr2N crystallites, while the upper one with the fine columnar (CrAl)N crystallites. This bi-layers were matched with a set of 7x nano-layers of CrN/(CrAl)N, while at the coating bottom a CrN buffer layer was placed. The foundry run for up to 19 500 cycles denuded most of coated area exposed to fast liquid flow (40 m/s) but left most of bottom part of the coating in the areas exposed to slower flow (7 m/s). The acquired data indicated that the main weakness of this coating was in its porosity present both at the columnar grain boundaries (upper layer) as well as at the bottom of droplets imbedded in it (both layers). They nucleate cracks propagating perpendicularly and the latter at an angle or even parallel to the substrate. The most crack resistant part of the coating turned-out the bottom layer built of roughly equiaxed fine Cr2N crystallites. Even application of this relatively simple duplex protection in the form of CrAlN coating deposited on the nitride substrate helped to extend the die run in the foundry by more than three times.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1341--1348
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The decreasing of die cracking for HDPC technology by changing parameters of heat treatment
    Autorzy:
    Herman, A.
    Zikmund, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380274.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metalografia
    obróbka cieplna
    właściwości mechaniczne
    odlewanie ciśnieniowe
    metallography
    heat treatment
    mechanical properties
    die material
    HPDC technology
    Opis:
    In earlier works were described trends in the production of tools for die casting (hot work). Almost the entire set of issues dealt with may seem insignificant when incompletely assembled acceptance of the material and the associated risks of processing a material with an inappropriate structure, leading to a very early defect of the die. Therefore, further work will focus particularly on identifying the causes of thermal cracks and preventing a suitable choice of acceptance criteria conditions and heat treatment.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 49-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Return Material Implementation into the Production of Silumin Casts on Technological and Economic Indicators of Production Process
    Autorzy:
    Gaspar, S.
    Majernik, J.
    Trytek, A.
    Podaril, M.
    Benova, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126917.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    product development
    quality management
    mechanical properties
    castings defects
    rozwój produktu
    zarządzanie jakością
    właściwości mechaniczne
    wady odlewów
    Opis:
    The production of high pressure die casts also brings difficulties regarding the processing of the waste material. It is mainly formed by runners, overflows and other foundry supplements used and, in the case of machines using the cold chamber, also the remainder from this chamber. As this material is often returned to the production process, we refer to it as return material. In the production process, it is therefore essential to deal with the proportion issue of return material against primary material that can be added to the melt to maintain the required cast properties. The submitted article monitors the quality properties of the alloy, selected mechanical properties of casts and porosity depending on the proportion of the return material in the melt. At the same time, the material savings are evaluated with regards to the amount of waste and the economic burden of the foundries. To monitor the above-mentioned factors, series of casts were produced from the seven melting process variants with a variable ratio of return to the primary material. The proportion ratio of return material in the primary alloy was adjusted from 100% of the primary alloy to 100% of the return material in the melting process. It has been proven that with the increasing proportion of the return material, the chemical composition of the melt changes, the mechanical properties of the alloy decrease and the porosity of the casts increases. Based on the results of the tests and analyzes, the optimal ratio of return and primary material in the melting process has been determined. Considering the prescribed quality of the alloy and mechanical properties, concerning the economic indicator of the savings, the ratio is set at 70:30 [%] in favor of the primary material.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 69--76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Thermal Stresses in an HPDC Machine Plunger During the Dosing and Filling Process
    Autorzy:
    Jankowski, Jacek
    Kołakowski, Dariusz
    Pisarek, Bogusław Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/101924.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    plunger
    HPDC machine
    mechanical and thermal stresses
    flat thermal stationary state
    equivalent stresses
    different tensile and compression strength
    tłok
    maszyna HPDC
    naprężenia mechaniczne i termiczne
    płaski termiczny stan stacjonarny
    równoważne naprężenia
    różna wytrzymałość na rozciąganie i ściskanie
    Opis:
    Distributions of mechanical and thermal stresses in a plunger of the high pressure die casting machine with a horizontal shot sleeve have been considered for a flat thermal stationary problem. An axial pressure of the plunger pressing in the technological process has been accounted for as well. Principal and equivalent stresses have been determined within two different hypotheses on the strength of materials, including one theory covering various allowable stresses in tension and compression. Four plunger material variants have been analysed.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 2; 1-12
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Magnesium Die Castings Produced Utilizing Process Scrap
    Autorzy:
    Fajkiel, A.
    Dudek, P.
    Reguła, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380871.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloys
    mechanical properties
    recycling
    high pressure die casting (HPDC)
    stopy magnezu
    właściwości mechaniczne
    recykling
    odlewnictwo wysokociśnieniowe
    Opis:
    Magnesium alloys are one of the lightest of all the structural materials. Because of their excellent physical and mechanical properties the alloys have been used more and more often in various branches of industry. They are cast mainly (over 90%) on cold and hot chamber die casting machines. One of the byproducts of casting processes is process scrap which amounts to about 40 to 60% of the total weight of a casting. The process scrap incorporates all the elements of gating systems and fault castings. Proper management of the process scrap is one of the necessities in term of economic and environmental aspects. Most foundries use the process scrap, which involves adding it to a melting furnace, in a haphazard way, without any control of its content in the melt. It can lead to many disadvantageous effects, e.g. the formation of a hard buildup at the bottom of the crucible, which in time makes casting impossible due to the loss of the alloy rheological properties. The research was undertaken to determine the effect of an addition of the process scrap on the mechanical properties of AZ91 and AM50 alloys. It has been ascertained that the addition of a specific amount of process scrap to the melt increases the mechanical properties of the elements cast from AZ91 and AM50 alloys. The increase in the mechanical properties is caused mainly by compounds which can work as nuclei of crystallization and are introduced into the scrap from lubricants and anti-adhesive agents. Furthermore carbon, which was detected in the process scrap by means of SEM examination, is a potent grain modifier in Mg alloys [1-3]. The optimal addition of the process scrap to the melt was determined based on the statistical analysis of the results of studies of the effect of different process scrap additions on the mean grain size and mechanical properties of the cast parts.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 31-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Runner Geometry on the Gas Entrapment in Volume of Pressure Die Cast
    Autorzy:
    Majernik, J.
    Podařil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382678.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    high pressure die casting
    runner dimensions
    air entrapment
    product development
    melt flow
    odlew wysokociśnieniowy
    rynna
    uwięzione powietrze
    przepływ stopu
    Opis:
    The high pressure die casting technology allows the production of complex casts with good mechanical properties, with high production repeatability within narrow tolerance limits. However, the casts are somewhat porous, which may reduce their mechanical properties. There are several recommendations for reducing the porosity of casts, which are aimed at setting the technological parameters of the casting cycle. One of the primary and important ways to reduce the porosity and air entrapment in the melt is a suitable gating system design. Submitted contribution is devoted to assessing the influence of the runner branching geometry on the air entrapment within the cast volume during the filling phase of the casting cycle. Four variants of the gating system for a particular cast are compared with different design of main runner branching. The initial design is based on a real gating system where the secondary runner is connected to the main runner at an angle of 90 °. The modified designs are provided with a continuous transition of the main runner into the secondary ones, with the change in the branching runner radius r1 = 15 mm, r2 = 25 mm and r3 = 35 mm. The air entrapment in the melt is assessed within the cast volume behind the cores, which have been evaluated as a critical points with respect to further mechanical treatment. When designing the structural modification of geometry it was assumed that by branch changing using the radius value r3 = 35 mm, the melt flows fluently, and thus the value of the entrapped air in the volume of the cast will be the lowest. This assumption was disproved. The lowest values of entrapped air in the melt were found in the casts with runner transition designed with radius r1 = 15 mm. The conclusion of the contribution explains the causes of this phenomenon and from a designing point of view it presents proposal for measures to reduce the entrapment of the air in casts.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 33-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Overflow Connecting Channel Cross-Section Design on Selected Parameters of High Pressure Die Casting
    Autorzy:
    Majernik, J.
    Podařil, M.
    Gojdan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837718.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HPDC
    odlewanie wysokociśnieniowe
    system przelewowy
    system bramkowania
    przepływ stopu
    die casting
    high pressure die casting
    overflow system
    gating system
    melt flowing
    Opis:
    High pressure die casting technology (HPDC) is a method enabling the production of shape-complex casts with good mechanical properties, with high repeatability of production within narrow tolerance limits. However, the casts show, to some extent, basic porosity, which may reduce their mechanical and qualitative properties. One of the main areas to focus on in order to reduce the porosity of casts is the correct design and structure of the gating and overflow system. Submitted article is devoted to the assessment of the connecting channel cross-section design for connecting the overflows to the cast on selected parameters of the casting process. Five different cross-section designs of connecting channels are considered, enabling the removal of gases and vapors from the volume during the molding. The connecting channels are designed with a constant width g = 10mm and variable height h1 =1.50 mm, h2 = 1.25 mm, h3 = 1.00 mm, h4 = 0.75 mm and h5 = 0.6 mm. The primary monitored parameter is the gas entrapment in selected points of the cast. The following is an evaluation of the pressure conditions change in the mold cavity at the end of the filling mode and local overheating of the mold material just below the surface of the mold face. With regard to the monitored parameters, based on the performed analyzes, the most suitable design solution of the connecting channel is assessed and recommendations for the design and structure of the overflows and their connection to the cast are derived.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 75-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symulacja spiętrzania stopu w komorze zimnokomorowej maszyny ciśnieniowej
    Simulation of the Alloy Up-rise in the Shot Chamber of Cold Chamber HPDC machine
    Autorzy:
    Wiktor, T.
    Burbelko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380113.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    komputerowe wspomaganie
    produkcja odlewnicza
    program ProCAST
    maszyna ciśnieniowa
    jakość odlewu
    okluzja powietrza
    computer support
    foundry production
    ProCAST program
    HPDC machine
    cast quality
    air occlusion
    Opis:
    Technologia odlewania do form metalowych z wykorzystaniem wysokiego ciśnienia jest jednym ze sposobów wytwarzania odlewów precyzyjnych. Forma metalowa zapewnia precyzję odwzorowania wymiarów gotowego wyrobu, lecz z powodu szczelności materiału, z którego jest wykonana, utrudnia odprowadzanie powietrza z wnęki. Dodatkowo powstawaniu okluzji powietrza sprzyja wysoka prędkość strugi i związany z tym skomplikowany charakter ruchu ciekłego metalu wewnątrz formy. W największym stopniu problem okluzji powietrza występuje w maszynach zimnokomorowych z poziomą komorą wtrysku. W maszynach tego typu dodatkowym źródłem gazów w odlewie może być niewłaściwy przebieg pierwszej fazy pracy maszyny ciśnieniowej. W pracy za pomocą symulacji komputerowych z wykorzystaniem oprogramowania ProCAST (ESI Group®) przeanalizowano zmiany kształtu swobodnej powierzchni stopu EN-AC 44300 AlSi12(Fe) podczas jego spiętrzania w komorze prasowania. Przeanalizowano wpływ prędkości ruchu tłoku, długości komory i stopnia jej wypełnienia na poprawny przebieg tego procesu.
    High Pressure Die Casting gives the possibility to produce the cast products with a high precision. Unfortunately, physical properties of the metal molds prevent the air evacuation from the mold cavity. High velocity of the stream and of the free surface movement as well as complicated character of the liquid metal movement prevent the air evacuation and promote the occlusions in the casting. Risk of the air occlusion is the highest in the case of the cold-chamber machines with a horizontal press-chambers. In the HP die casters of this type the addition source of the gas in the casting is the improper evolution of the alloy free surface during the first stage of the cycle (alloy up-rise). In this paper the evolution of the free surface of the EN-AC 44300 AlSi12(Fe) alloy was analyzed by ProCAST software (ESI Group®) in the HP chamber during the first stage of the working cycle. The influence of the piston velocity, shot chamber length and initial level of the alloy in the shot chamber on the behavior of the alloy free surface at this stage was analyzed.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 151-154
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The rationalization of automatic units for HPDC technology
    Autorzy:
    Herman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382755.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    automatyka w odlewnictwie
    robotyka w odlewnictwie
    zarządzanie jakością
    odlewanie wysokociśnieniowe
    cykl pracy
    automation in foundry
    robotics in foundry
    quality management
    high pressure die casting (HPDC)
    work cycle
    rationalization of automatic unit
    Opis:
    The paper deals with problem of optimal used automatic workplace for HPDC technology - mainly from aspects of operations sequence, efficiency of work cycle and planning of using and servicing of HPDC casting machine. Presented are possible ways to analyse automatic units for HPDC. The experimental part was focused on the rationalization of the current work cycle time for die casting of aluminium alloy. The working place was described in detail in the project. The measurements were carried out in detail with the help of charts and graphs mapped cycle of casting workplace. Other parameters and settings have been identified. The proposals for improvements were made after the first measurements and these improvements were subsequently verified. The main actions were mainly software modifications of casting center. It is for the reason that today's sophisticated workplaces have the option of a relatively wide range of modifications without any physical harm to machines themselves. It is possible to change settings or unlock some unsatisfactory parameters.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a New Tool Material for High Pressure Die Casting
    Autorzy:
    Herman, A.
    Zikmund, P.
    Tatíček, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/382710.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    metallography
    die material
    HPDC technology
    wear resistant alloy
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    metalografia
    odlewanie ciśnieniowe
    stop odporny na ścieranie
    Opis:
    The paper describes existing requirements for tool materials. In the light of experience with these supplied materials, we have demonstrated their considerable influence on the life of molds for die casting technology. From this research came the evaluation methodology of these tool materials which has been used for directing the development of a new material. Based on the new regulation of the chemical composition a sample was casted and forged after that. Then was determined the process of heat treatment and from a block of this material a mold insert was produced. This insert is now being tested in production.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 23-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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