Wyniki wyszukiwania - Biblioteka Nauki

1

A formalised description of foundry production program

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Wrona R. , Stawowy A. , Macioł A.

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2007

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tom Vol. 7, iss. 3

179-182

EN

Rational designing of foundry enterprises is based on a program allowing for both the quantitative and qualitative aspects of production. Studies carried out in this respect are mainly oriented at the task of establishing a classification system of castings and formalising their description. This article refers to the absolute classification and technological classification of castings existing so far; some principles of the formation of a model of the data on production program have been presented as well. The program was written by the technique of relational databases with description of the documents and diagrams of relations existing between the data.

2

Wybrane właściwości kompozytu zawiesinowego AISi11/cząstki 1H18N9T

86%

Gawdzińska K. , Grabian J. , Dolata-Grosz A.

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2006

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tom R. 6, nr 22

192-199

PL

W niniejszej pracy przedstawiono badania strukturalne oraz wyniki badań wybranych właściwości materiału kompozytowego zawiesinowego (ex situ) wytworzonego metodą mechanicznego mieszania. Osnowę kompozytu stanowił stop aluminium AISi11, zbrojenie występowało w postaci cząstek stalowych (stal kwasoodporna 1H18N9T). Przeprowadzono próby eksploatacji w symulowanych warunkach podwyższonej temperatury. Odlewy wygrzewano w temperaturze 550°C przez 6 godzin. Stwierdzono pojawienie się wady typu: obecność kruchych faz na granicy osnowa-zbrojenie. Kompozyty wygrzewane i nie wygrzewane poddano badaniu odporności na ścieranie i ściskanie w celu porównania ich właściwości.

EN

The paper presents structural research and findings of tests on usable properties of suspension composite produced by mechanical mixing. The matrix of the composite is made of AISi11 aluminium alloy and reinforcement of steel particles (1H18N9T acid resistant steel). The composite is subjected to simulation of use in high temperature. Casts undergo thermal treatment at 550°C for 6 hours. A defect has been discovered, namely presence of brittle phases at the boundary between matrix and reinforcement. Composites treated and not treated are tested regarding resistance to abrasion and pressure to compare their properties.

3

Wpływ zawartości pierwiastków resztkowych na jakość odlewów ze stali konstrukcyjnej

72%

Pogorzałek J. , Garbarz B. , Marcisz J. , Różanski P.

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2009

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tom T. 61, nr 2

55-58

PL

Celem pracy było zbadanie wpływu pierwiastków resztkowych (Cu, Sn, Sb, As, Pb, Bi, Zn) na powstawanie wad odlewów ze stali konstrukcyjnej. Odlewy w postaci płytki z żebrami i walca ze stałi węglowej o zróżnicowanej zawartości pierwiastków resztkowych odlano w warunkach laboratoryjnych do form piaskowych. Próbki zarówno z odlewów laboratoryjnych jak i później z przemysłowych badano za pomocą mikroskopu świetlnego i elektronowego skaningowego. W odlewach laboratoryjnych o podwyższonej zawartości Pb i Bi stwierdzono występowanie fazy Pb-Bi w postaci skupisk cząstek, które były miejscem zarodkowania pęknięć podczas łamania próbek w temperaturze otoczenia. Natomiast w odlewach przemysłowych, w których wystąpiła podwyższona zawartość Pb stwierdzono obecność cząstki fazy na osnowie Pb na płaszczyźnie propagacji pęknięcia, co skutkowało obniżeniem właściwości wytrzymałościowych.

EN

The purpose of the work was to examine the impact of residua! elements (Cu, Sn, Sb, As, Pb, Bi, Zn) on defects of constructional steel castings. The castings in the form of carbon steel ribbed plates and roll with diverse contents of residual elements were cast into sand moulds under the laboratory conditions. The samples of laboratory casts and, then, industrial casts were examined using the light microscope and electron scanning microscope. In the laboratory casts with increased content of Pb and Bi the occurrence of the Pb-Bi phase in the form of particle clusters that were the place where cracks nucleated from during sample breaking at ambient temperature was found, while in the industrial casts with increased Pb content the presence of the particle of Pb-base phase on the cracking propagation plane, which resulted in reduction in mechanical properties, was found.

4

A novel approach to the design and optimisation of aluminium cast component heat treatment processes using advanced UMSA physical simulations

72%

Dobrzański L. A. , Kasprzak M. , Kasprzak W. , Sokolowski J. H.

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2007

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tom Vol. 24, nr 2

139-142

EN

Purpose: The goal of this publication is to present a new laboratory methodology for simulation of industrial melting, solidification and heat treatment using the patented Universal Metallurgical Simulator and Analyzer (UMSA) Technology Platform. Two examples to demonstrate UMSA's capabilities are presented for optimized heat treatment processes at the request of the North American automotive industry. Design/methodology/approach: The unique UMSA Platform was used to rapidly physically simulate very complex industrial heat treatment processes using stationary macro test samples and computer controlled heating and cooling source. Findings: The UMSA simulations proved to be very accurate in order to simulate the non-linear temperature/time profile of the solidification process combined with the continuous heat treatment operation. Moreover, the complex industrial heat treatment process was successfully replicated for an 800g test sample and the targeted structural and mechanical properties were met. Research limitations/implications: Selected examples of the heat treatment have been presented for aluminum based alloys only. The current research addresses Mg and Ti based alloys and thermal processing under vacuum and inert/active environments. Practical implications: The presented methodology is capable of dissecting all processes and linking the cast component's optimized performance with individual production steps. The technical capabilities of the UMSA Platform have been recognized and have already been applied by industrial partners. Originality/value: The simulation method that is presented here will greatly improve the ability of laboratory investigators to simulate and assess the effects of the heat treatment variables.