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2 Archives of Foundry Engineering

2 2008

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Modeling of mould cavity filling process with cast iron in Lost Foam method Part 3. Mathematical model – pressure inside the gas gap

100%

Pacyniak T. , Kaczorowski R.

tom Vol. 8, iss. 3s

79--83

In this work mathematical model describing changes of pressure inside the gas gap was shown during manufacturing gray cast iron castings with use of lost foam process. Authors analyzed the results of numerical simulation enclosing influence of foamed polystyrene pattern density, permeability and thickness of refractory coating on pressure changes in the gap. Studies have shown, that all these parameters have significant influence on pressure inside the gas gap.

Modeling of mould cavity filling process with cast iron in Lost Foam method Part 1. Mathematical model – rate of pattern gasification

100%

Pacyniak T. , Kaczorowski R.

tom Vol. 8, iss. 3s

69--74

In this work a mathematical model of mould cavity filling process with cast iron for lost foam method was shown, enclosing phenomena connected with gasification of foamed polystyrene pattern. For its description the thermal balance equation was used, which together with pouring rate equations (part 2) and pressure change equations (part 3) enabled determination of permeability, refractory coating thickness and foam pattern density influence on pouring rate, gas pressure in gas gap and its size. In this work authors showed results of numerical simulation concerning rate of pattern gasification and gas gap size, based on developed mathematical model. Presented studies indicated, that with decrease in coating permeability and increase in its thickness the gas gap size increased causing the decrease of foamed polystyrene pattern gasification rate.