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Osiadanie materiałów izolacyjnych używanych do ocieplania metodą wdmuchiwania

Zaorski Robert

Izolacje

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2020

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R. 25, nr 9

34--36

PL

W artykule omówione jest zagadnienie osiadania izolacji wdmuchiwanych w przestrzeniach zamkniętych i otwartych. Podane są też przykłady prawidłowego doboru grubości warstwy w zależności od klasy osiadania danego materiału.

EN

The article discusses the issue of subsidence of blown-in insulation in closed and open spaces. There are also examples of proper selection of layer thickness depending on the class of settlement of a given material.

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Studies of the Influence of the Number and Distribution of Vents on the Production Process of Cores by the Blowing Method

Dańko R.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 1

105--111

EN

The results of studies of the cores production by blowing methods with utilising the modified experimental shooting machine SR-3D, are provided in the hereby paper. The core sands from the Cordis technology were applied in the presented investigations. The influence of the number and distribution of vents on the shaped core box filling, filmed by a digital camera, was determined. Investigations were performed for the shooting pressures of 0.4, 0.5 and 0.6 MPa and for three surfaces of the shooting hole, at various numbers and distribution ways of vents in the experimental core box. The selected results of the model investigations were compared with the results of simulations performed previously in the PROCAST programme. The intensity of the core sand outflow from the shooting chamber into the core box of the experimental shooting machine was measured. Technological effects were assessed on the basis of the core sand apparent density in individual parts of the core, in dependence on the character of the pressure increase in the shooting chamber and the pressure value obtained in the core box.

3

Validation of the Theoretical Model of Determining the Strength of Cores Made by the Blowing Method

Dańko R.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 3

27--30

EN

Core sands for blowing processes, belong to these sands in which small amount of the applied binding material has the ability of covering the sand matrix surface in a way which - at relatively small coating thickness - allows to achieve the high strength. Although the deciding factor constitute, in this aspect, strength properties of a binder, its viscosity and ability to moisten the matrix surface, the essential meaning for the strength properties of the prepared moulding sand and the mould has the packing method of differing in sizes sand grains with the coating of the binding material deposited on their surfaces. The knowledge of the influence of the compaction degree of grains forming the core on the total contact surface area can be the essential information concerning the core strength. Forecasting the strength properties of core sands, at known properties of the applied chemically hardened binder and the quartz matrix, requires certain modifications of the existing theoretical models. They should be made more realistic with regard to assumptions concerning grain sizes composition of quartz sands and the packing structure deciding on the active surface area of the contacts between grains of various sizes and - in consequence - on the final strength of cores.

4

Influence of the Matrix Grain Size on the Apparent Density and Bending Strength of Sand Cores

Dańko R.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 1

27--30

EN

The results of investigations of the influence of the matrix grain sizes on properties of cores made by the blowing method are presented in the hereby paper. Five kinds of matrices, differing in grain size compositions, determined by the laser diffraction method in the Analysette 22NanoTec device, were applied in investigations. Individual kinds of matrices were used for making core sands in the Cordis technology. From these sands the shaped elements, for determining the apparent density of compacted sands and their bending strength, were made by the blowing method. The shaped elements (cores) were made at shooting pressures being 3, 4 and 5 atn. The bending strength of samples were determined directly after their preparation and after the storing time of 1 hour.