Temat: die-casting - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Analiza rozwoju systemów dozowania stopów aluminium w zimnokomorowych maszynach ciśnieniowych
Analysis of the Development of Dosing Systems of Aluminium Alloys in the Cold Chamber Die Casting Machines
Autorzy:: Kowalczyk, W.
Dańko, R.
Tematy:: odlewnictwo ciśnieniowe
maszyna ciśnieniowa
stop aluminium
die casting
die casting machine
aluminum alloy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/381900.pdf Link otwiera się w nowym oknie
Opis:: W publikacji poddano analizie tradycyjne i automatyczne systemy dozowania stopów aluminium w zimnokomorowych maszynach ciśnieniowych dominujące w europejskim odlewnictwie. Omówiono ogólne cechy istniejących, automatycznych rozwiązań systemów dozowania oraz nowych rozwiązań, powiązanych z maszyną ciśnieniową. Przedstawiono także podejmowane przez producentów działania w zakresie dalszego rozwoju tych systemów.
The analysis of traditional and automated dispensing systems of aluminium alloys in cold-chamber die casting machines, prevalent in European foundries is presented in paper. The general characteristics of existing automated dispensing systems solutions, characterizing the functionality of new solutions in cooperation with the die casting machine, as well as the actions taken to further their development is presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Nowe kierunki i rozwiązania w konstrukcji zimnokomorowych maszyn ciśnieniowych nowej generacji
New Trends and Solutions in the Design of Cold-Chamber Die Casting Next-Generation Machines
Autorzy:: Kowalczyk, W.
Dańko, R.
Tematy:: odlewnictwo ciśnieniowe
maszyna ciśnieniowa
stop aluminium
pressure die casting
die casting machine
aluminium alloy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/381001.pdf Link otwiera się w nowym oknie
Opis:: W publikacji poddano analizie aktualny stan oraz kierunki rozwoju rozwiązań konstrukcyjnych maszyn ciśnieniowych z zimną komorą prasowania, decydujących jednocześnie o perspektywicznym rozwoju tych maszyn oraz technologii odlewania ciśnieniowego. Skupiono się na głównych zespołach funkcjonalnych obejmujących układy: napędu hydraulicznego, zwierania i ryglowania, oraz prasowania w maszynach znanych firm, obecnych na rynku europejskim.
The paper presents the current status and development trends of design solutions in cold chamber die casting machines. Authors focuses on the major functional elements of machines systems: a hydraulic drive, closing and locking systems and pressing system, in machines from known on the European market producers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Spreading of Cracks Due to Thermal Fatigue in Metal Molds
Autorzy:: Ružbarský, J.
Biały, W.
Tematy:: die casting
cracks
metal moulds; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/2064973.pdf Link otwiera się w nowym oknie
Opis:: The article deals with the formation and spread of cracks from thermal fatigue in metallic forms. For a detailed examination of the problem, it is necessary to describe the thermal side of the process and the mechanism of mechanical stressing of the material. For the heating of the material is valid where the thermal diffusivity of the material is exercised by the decision method. The stress of the material by heating from the die casting metal depends mainly on the physical properties of the material when the calculated stress does not exceed the yield point. Also, with the help of dislocations write the life to the origin of the cracks in the cycles eventually the share of this lifetime on the total lifetime in dependence on the mechanical and physical properties of the material. During operation tests the occurrence of the cracks on the mold surface was initiated by the inclusion or concentration of stress in the knurling effect of fine grooves after grinding. Other cracks occurred in the undersurface layer and their direction was statistically accidental.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Casting machines and properties of Al-Si castings alloys
Autorzy:: Ružbarský, Juraj
Krenický, Tibor
Maščeník, Jozef
Coranič, Tomáš
Tematy:: die casting
technological parameters
machines
die casting pressure
pressing speed
odlewanie ciśnieniowe
parametry technologiczne
maszyny; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/2175487.pdf Link otwiera się w nowym oknie
Opis:: The paper focuses on the research of holding pressure inside the mould cavity and pressing speed as technological parameters of die casting. The experiments conducted within the frame of the practical part examined the plunger and the pressure or the holding pressure in the mould cavity influencing the mechanical properties of a casting which were represented by ultimate tensile strength and percentage share of porosity of Al-Si castings. The results of experiments and analysis of the measured values proved the relation between pressure, or holding pressure, in the mould cavity and the ultimate tensile strength and porosity of castings. Plunger pressing speed is closely related to mould cavity filling mode which affected the final porosity of casting. It can be assumed that die casting is positively influenced by the increase of ultimate tensile strength and reduction of porosity during the increase of pressure or of holding pressure in the mould cavity. Higher values of holding pressure caused the elimination of pores which resulted in a decrease in the percentage share of pores in the casting and an increase in values of ultimate tensile strength.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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.
Tematy:: high-pressure die casting
casting nonconformities
structure
silumin
microhardness; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352331.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten
Autorzy:: Szymczak, T.
Gumienny, G.
Pacyniak, T.
Tematy:: multicomponent silumins
pressure die casting
DTA method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354656.pdf Link otwiera się w nowym oknie
Opis:: The basic aim of this study is to investigate the effect of vanadium and tungsten on the crystallization process, microstructure and mechanical properties of silumin grade EN-AC 46000. The research involved a derivative thermal analysis DTA of the crystallization process, the metallographic analysis as well as the mechanical properties. The metallographic analysis was carried out on pressure die castings and made in the DTA probe. Vanadium and tungsten were added simultaneously to silumin in amount of approximately 0.1; 0.2; 0.3 and 0.4%. The DTA studies have shown the similar shape of all crystallization curves. It has been shown the additives of vanadium and tungsten in pressure die cast silumin can significantly increase its tensile strength as an well as elongation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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
Tematy:: temperature drop
die casting
optimization
pouring
ladle tilt; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/2172385.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Computer modelling of the ablation casting process and prediction of the strength properties of AC-42000 castings
Autorzy:: Małysza, Marcin
Puzio, Sabina
Major-Gabryś, Katarzyna
Głowacki, Mirosław
Wilk-Kołodziejczyk, Dorota
Kamińska, Jadwiga
Tematy:: casting
simulations
ablation
gravity sand casting
gravity die casting
mechanical properties; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/29520071.pdf Link otwiera się w nowym oknie
Opis:: The demand for castings with superior properties has compelled the development and optimization of manufacturing technologies. By further developing already known techniques, we are able to contribute to the introduction of new research possibilities. The article presents the methodology of conducting simulation tests of the gravity casting process into sand moulds with the use of ablation. The ablation technique consists in spraying water through evenly spaced nozzles onto a mould into which the liquid casting alloy has been poured. The conducted research focuses on an alloy from the group of Al-Si alloys. In order to compare the effects of different techniques, additional tests were carried out for gravity casting into sand and metal die moulds. At the same time, virtual experiments were conducted to develop a simulation methodology for ablation casting technology, taking into account mould degradation. Additionally, the possibility of predicting the final mechanical properties of various manufacturing technologies was tested. Destructive tests were carried out to determine the mechanical properties in the cast samples, as well as microstructure tests and secondary dendrite spacing. The results of the mechanical tests are compared with the predicted simulation properties.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Focus on development of quality, high pressure die casting process
Autorzy:: Peter, I.
Rosso, M.
Tematy:: numerical simulations
die casting
development of casting technology
HPDC optimization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354404.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Physical Modelling of the Production of an Alloy Vapour Source for the Synthesis of Dielectric Material
Autorzy:: Nadolski, M.
Stradomski, G.
Zdunek, K.
Okrasa, S.
Tematy:: aluminum-silicon alloy
magnetron sputtering processes
gravity casting
die casting; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355587.pdf Link otwiera się w nowym oknie
Opis:: The paper reports the results of a physical modelling study of the production of a hypereutectic aluminium alloy to be used formaking an alloy vapour source for operation in the magnetron. Within the study, targets from a hypereutectic aluminium-silicon alloy were made in laboratory conditions. Thus obtained material was subjected to heat treatment, porosity analysis, and the assessment of the microstructure and fitness for being used in the magnetron. The process of melting the hypereutectic Al-Si alloy was carried out at the Department of Foundry of the Czestochowa University of Technology. The investigation into the production of the alloy vapour source for the synthesis of the dielectric material from the hypereutectic aluminium alloy has confirmed.
Dostawca treści:: Biblioteka Nauki

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