Wyniki wyszukiwania - Biblioteka Nauki

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Przykład zastosowania systemów CAD/CAE do projektowania technologii odlewania

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Paśko J. , Popek B. , Skoczylas R.

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tom Vol. 49, z. 5

182-186

PL

W artykule przedstawiono przykład zastosowania projektowania współbieżnego (Concurrent Engineering) do szybkiego opracowania w WSK "PZL-Rzeszów" S.A. technologii odlewania niskociśnieniowego odlewu, który był wykonywany przez innego producenta w technologii grawitacyjnej. Wykonaną w zaawansowanym systemie projektowym UNIGRAPHICS trójwymiarową geometrię odlewu oraz oprzyrządowania odlewniczego przekazano do systemu MAGMASOFT, który symuluje proces odlewania między innymi z uwzglęnieniem specyfiki odlewania niskociśnieniowego. Wyniki symulacji były podstawą do kolejnych modyfikacji technologii.

EN

In the article an example of application of concurrent engineering at WSK PZL-Rzeszów S.A. is given. The system was applied to enable rapid development of a low-pressure casting technology to manufacture en element which has so far been made by another manufacturer by the gravity die casting technology. The three-dimensional geometry of the casting made in the advanced design system UNIGRAPHICS as well as the foundry tooling have been transferred into the MAGMASOFT system which, among others, simulates the casting process, considering the specific features of the low-pressure casting process. The results of simulation were a basis for further modifications of this technology.

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Komputerowa symulacja kokilowego odlewania korpusu sprężarki za pomocą systemu MAGMASOFT

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Błotnicki M. , Paśko J. , Skoczylas R.

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tom Vol. 49, z. 11

428-431

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Repeatable and reproducible methodology of the AZ91 alloy structure evaluation

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Adamiec J. , Roskosz S. , Cwajna J. , Paśko J.

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2007

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tom Vol. 7, iss. 2

95-100

EN

The objective of the research conducted was to develop a comprehensive procedure for a quantitative evaluation of magnesium casting alloy's (AZ91) microstructure. The procedure encompasses: a methodology of metallographic specimens preparation, microstructure detection methods, selection of image acquisition methods, image analysis methodology and adjustment of morphological and stereological parameters to the quantitative description of volume fraction of phases and structural components of the AZ91.

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The influence of age hardening on the microstructure of GA8 magnesium alloy

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Kiełbus A. , Adamiec J. , Cwajna J. , Paśko J.

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2007

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tom Vol. 28, nr 9

533-540

EN

Purpose: GA8 magnesium alloy is a general purpose gravity sand casting alloy containing aluminum, zinc and manganese. Typically, it is used in aerospace, automotive or commercial casting applications particularly where there is no high temperature requirement. Particularly for elements of the car interior, car body, chassis and driving gears. The aim of this paper is to present the results of investigations on the microstructure of the GA8 magnesium alloy after precipitation hardening. Design/methodology/approach: The study was conducted on GA8 magnesium alloys in as-cast condition and after heat treatment. The microstructure was characterized by optical microscopy (Olympus GX-70) and a scanning electron microscopy (Hitachi S3400) equipped with an electron dispersive detector EDS (VOYAGER of NORAN INSTRUMENTS). To measure the stereological parameters, an image analysis program "AnalysisPro" was used. Findings: A cast of the GA8 magnesium alloy shows the presence of continuous and discontinuous precipitates of ß (Mg17Al12) phase at the solid-solution grain boundaries, Moreover, the occurrence of Mg2Si and Mn5Al8 phases has been provided. After solution treatment at 415°C the area fraction of continuous and discontinuous β phase precipitates decreased. After ageing at 170°C GA8 alloy is characterized by discontinuous β phase along the solid solution grain boundaries. Area fraction of this phase increased compared to supersaturated state. Research limitations/implications: Future researches should involve investigations of the influence of precipitation hardening parameters on the mechanical properties of GA8 magnesium alloy. Practical implications: The established precipitation hardening parameters can be useful for preparing heat treatment technology of the GA8 magnesium alloy. Originality/value: The relationship between the as cast structure, precipitation hardening parameters and Mg17Al12 phase morphology in GA8 magnesium alloy was specified.

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Selection of the Manufacturing of Aluminum Casting Alloys with Hypoeutectic Aluminum Silicon Group

88%

Knych T. , Uliasz P. , Wiecheć J. , Paśko J. , Jarosz R.

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2014

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tom Vol. 14, iss. 1 spec.

103--108

EN

Aluminum alloys are one of the most popular casting materials. Their enormous popularity due to a wide set of desired material properties such as high strength properties, low thermal expansion coefficient, high thermal and electrical conductivity, very good casting properties, including castability. The most common group of cast aluminum alloys are silumins, where the main alloy addition is silicon. Al-Si alloys are mainly used in the transport industry and construction applications. Another area of applications using this group of materials is the electrical and power engineering industry, where the crucial meaning has the correlation of two types of properties: electrical and mechanical. This paper presents the influence of alloying elements on the electrical properties and mechanical properties of materials undergoing heat treatment. Heat treatment include solution heat treatment and next aging or overaging. Electrical properties represents the electrical conductivity tested by eddy current method. Mechanical properties are in turn represented by the results of measurements of Brinell hardness. Tests include three alloys belong to hypoeutectic silumins group with silicon content in the range of 4,5 to 7 wt%. Si.