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1
Content available remote Solidification of superalloys in shell moulds and its numerical simulation
Roučka J., Kováč M., Odložil J., Hrbáček K.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
137-146
EN
The paper presents the results of the experiments on the solidification of superalloys in shell moulds. The analysis of heat transfer during the solidification of castings in ceramic moulds was carried out theoretically and confirmed by the results of earlier experiments conducted on model shells. Results of experimental temperature measurement were compared with numerical calculations (performed using the ProCast software) and corrections of the calculation parameters were proposed. A model of structure simulation was verified on a selected real casting. It can be assumed that simulating the structure will be a theoretically and computationally demanding problem.
2
Content available remote Research on possibility of microwave measurements application for determination of adhesive ingredient content in moulding sand
Nowak D., Granat K., Stachowicz M., Jaworski G.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 3
129--132
EN
This paper presents preliminary results of the research on possibility of determination of adhesive material content in classical moulding sands with application of microwave measurements. Presented results have been obtained by measurements with microwave slotted line. Information about bonding clay content has been derived from measurements of reflection coefficient and VSWR of tested substrate sample. The presented measurement method allows for fast and accurate measurements.
3
Content available remote Computer aided process of dimensional distortion determination of bounded plaster sandmix Part II
Pawlak M., Niedźwiedzki Z.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
105-108
EN
A computer program allowing calculation of dimensional changes of mould made of cristobalite-gypsum composition in process of its heat treatment and preparation for molten metal casting is presented in this paper. The composition of the mixture and casting temperature to obtain cast of predetermined dimensions can be calculated using presented software. The base for program elaboration were the results of dilatometric test of bounded plaster sandmix composed of half hydrate [alpha]-CaSO_4 x 0,5H_2O of various cristobalite ratio. Approximation was carried out in the range of temperatures 100 - 700°C.
4
Content available remote Bainite obtaining in cast iron with carbides castings
Pietrowski S., Gumienny G.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
109-114
EN
In these paper the possibility of upper and lower bainite obtaining in cast iron with carbides castings are presented. Conditions, when in cast iron with carbides castings during continuous free air cooling austenite transformation to upper bainite or its mixture with lower bainte proceeds, have been given. A mechanism of this transformation has been given, Si, Ni, Mn and Mo distribution in the eutectic cell has been tested and hardness of tested castings has been determined.
5
Content available remote Microwaves energy in curing process of water glass molding sands
Granat K., Nowak D., Pigiel M., Stachowicz M., Wikiera R.
Archives of Foundry Engineering
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2007
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Vol. 7, iss. 1
183-188
EN
This work presents the results of investigation of microwave heating on hardening process of water glass molding sands. Essential influence of this heating process on basic properties such as: compression, bending and tensile strength as well as permeability and abrasion resistance has been found. It has been proved, that all investigated sorts of sodium water glass with a module between 2.0 and 3.3 can be used as a binder of molding sands in microwave curing process. It has been found during analysis of research results of sands with 2.5 % water glass addition that they are practically the same as in case of identical molding sands dried for 120 minutes at the temperature of 110°C, used for comparative purposes. Application of microwave curing of molding sands with water glass, however, guarantees reduction of hardening time (from 120 to 4 minutes) as well as significant reduction of energy consumption. Attempts of two stage hardening of the investigated water glass molding sands have also been carried out, that is after an initial hardening during a classical CO_2 process (identical sands have also been tested for comparison after CO_2 blowing process) and additional microwave heating. It has been found that application of this kind of treatment for curing sands with 2.5 % sodium water glass content and module from 2.0 up to 3.3 results in the improvement of properties in comparison to classical CO_2 process.
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