Wyniki wyszukiwania - Biblioteka Nauki

1

Inwestycja w naturalne materiały włókniste – to się opłaca!

100%

Siemińska I. , Szulc A.

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tom R. 78, nr 12

656--657

PL

Rosnąca potrzeba wytwarzania innowacyjnych materiałów na bazie włókien naturalnych stawia nowe wyzwania dla przemysłu i nauki. W szczególności zagadnienie to dotyczy rozwiązań, w których procesy wytwórcze wiążą się z niskim nakładem energetycznym, co ma swoje pozytywne konsekwencje ekonomiczne. Przede wszystkim przejawia się korzystnym oddziaływaniem na środowisko naturalne i klimat.

2

Recycling of plastics from stockpiles performed by means of low-pressure injection

100%

Gintowt J.

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2010

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tom Vol. 10, iss. 3 spec.

259--262

EN

A viability analysis of manufacturing goods out of plastics, from stockpiles and municipal residues, has been carried out. The analysis pertains goods in the form of inserts manufactured in light molds of big-sizes, by means of low-pressure injection. The cost analysis of the investment and manufacturing suggests that those goods are not price-competitive, as compared to other ones used in similar situations. Exploitation analysis proves that the goods, used outdoors are easily damaged on the surface by UV exposure, temperature differences of 24-hour cycle, as well as by water and plants. Re-recycling, and especially, the grinding of the product poses another challenge in the future. An analysis of the environmental impact of energy acquisition during the manufacturing of those goods was also carried out. The analysis also pertains the method of identifying the type of raw-material, in the process of segregation that stems from the necessity of a complex content training of staff running waste segregation posts.

3

Nowe żywice furfurylowe bardziej przyjazne dla środowiska

100%

Holtzer M. , Kmita A. , Roczniak A.

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2014

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tom Vol. 14, iss. 4 spec.

47--50

PL

Coraz ostrzejsze przepisy w zakresie ochrony środowiska wymuszają na producentach materiałów dla przemysłu odlewniczego opracowywanie nowych produktów, bardziej przyjaznych dla środowiska. Jednym z takich produktów są żywice furfurylowe, które obecnie mają największy udział w grupie mas no-bake. Wprowadzone w ostatnich latach w UE przepisy dotyczące ograniczenia zawartości wolnego alkoholu furfurylowego (< 25%) w żywicach oraz naciski w kierunku redukcji emisji SO2, formaldehydu, fenolu, benzenu i toluenu, jak również związków z grupy WWA, szczególnie na stanowiskach pracy spowodowały pojawienie się na rynku nowej generacji żywic furfurylowch oraz katalizatorów (o zmniejszonej zawartości siarki lub bezsiarkowych). W artykule dokonano analizy wpływu tych nowych produktów stosowanych w technologii mas z żywicami furfurylowymi na środowisko i warunki pracy.

EN

More and more strict regulations, concerning the environment protection, force the producers of materials for foundry industry to develop new products, more friendly for the environment. One of such products are furfuryl resins, which currently have the largest share within the group of no-bake moulding sands. Regulations introduced in the last years in the European Union concerning limitations of a free furfuryl alcohol content (< 25%) in resins as well as pressures to reduce SO2, formaldehyde, phenol, benzene, toluene and compounds from the PAHs group emissions, especially at work stands, caused an appearance of the new generation of furfuryl resins and catalysts (of a decreased sulphur content or even sulphur-free). The analysis of the influence of these new products, applied in the moulding sands with furfuryl resins technology, on the environment and work conditions was performed in the hereby paper.

4

Ceramic-Carbon Filters for Molten Metal Alloys Filtration

80%

Asłanowicz M. , Ościłowski A. , Lipowska B. , Witek J. , Robak Z. , Muzyka R. , Kowalski P. , Wańczyk K.

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tom iss. 1

98--102

EN

In 2014 we finished research works involved in the development of a technology for manufacturing innovative ceramic-carbon foam filters for molten metal alloys filtration, which were financed by the National Centre for Research and Development (NCBiR) from INNOTECH programme resources. A batch of the filters produced in this technology was tested in practice in domestic cast steel and cast iron foundries. The trials were successful and foundries declared their intention to purchase the newly-developed filters for the current production of casts. This provided an incentive for “Ferro-Term” Sp. z o.o. to start design works on the prototype line for a serial production of these filters. At the same time, in co-operation with a scientific consortium, including the co-authors of the technology, i.e. the Institute of Ceramics and Building Materials, Refractory Materials Division in Gliwice, Institute for the Chemical Processing of Coal in Zabrze and Foundry Research Institute in Cracow, the company made a successful attempt to raise some funds for the necessary adaptation of the developed technology from the semi-technical to industrial scale from Intelligent Development Operational Programme. In the article we have presented information on the effects of works performed within the framework of the project entitled “Modernization and adaptation of the existing technological line for purposes related to technology verification and start-up of the production of innovative ceramic-carbon filters for molten metal alloy filtration”.

5

Elasticity of Moulding Sands – a Method of Reducing Core Cracking

80%

Dobosz S. M. , Grabarczyk A. , Major-Gabryś K.

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tom Vol. 17, iss. 1

31--36

EN

This paper focuses on mechanical properties of self hardening moulding sands with furfuryl and alkyd binders. Elasticity as a new parameter of moulding sands is investigated. With the use of presented testing equipment it is possible to determine force kinetics and deformation of moulding sand in real time. The need for this kind of study comes from the modern casting industry. New foundries can be characterized with high intensity of production which is correlated with high level of mechanization and automatization of foundry processes. The increasingly common use of manipulators in production of moulds and cores can lead to generation of new types of flaws, caused by breakage in moulds and cores which could occur during mould assembly. Hence it is required that moulds and cores have high resistance to those kinds of factors, attributing it with the phenomenon of elasticity. The article describes the theoretical basis of this property, presents methods of measuring and continues earlier research.

6

New Use of Instruments for More Accurate Wax Pattern Blade Segment Production

80%

Herman A. , Kubelková I. , Vrátný O.

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tom iss. 2

101--106

EN

Precision casting is currently motivated by high demand especially for castings for the aerospace, automotive and gas turbine industries. High demands on precision of this parts pressure foundries to search for the new tools which can help them to improve the production. One of these tools is the numerical simulation of injection process, whereas such software especially for investment casting wax injection, process does not exist yet and for this case must be the existing software, for alloys or plastic, modified. This paper focuses on the use of numerical simulations to predict the behavior of injected models of gas turbine blades segments. The properties of wax mixtures, which were imported into the Cadmould simulation software as a material model, were found. The results of the simulations were verified using the results of 3D scanning measurements of wax models. As a supporting technology for verifying the results was used the Infrared Thermography.