Materials Transactions Online

Materials Transactions, Vol.58 No.04 (2017) pp.635-640
© 2017 Japan Foundry Engineering Society

Effect of Coat Permeability on Mold Filling in Expendable Pattern Casting Process of Thin Wall Aluminum Alloy Casting

Sadatoshi Koroyasu1

1Department of Mechanical and Precision Systems, School of Science and Engineering, Teikyo University, Utsunomiya 320-8551 Japan

The effect of coat permeability on mold filling for thin wall aluminum alloy castings in the expendable pattern casting (EPC) process was investigated experimentally. Thin wall aluminum alloy plates were cast by the EPC process, using eight kinds of coats with different permeabilities. The fluidity length and melt velocity were measured. The use of thin expendable polystyrene (EPS) pattern led to shorter fluidity length of melt. When the coat permeability was less than approximately 2, the fluidity length of the melt and melt velocity increased with increasing coat permeability. When the coat permeability was greater than approximately 2, even when the coat permeability increased, the fluidity length of the melt and melt velocity did not increase so much. The application of high expansion ratio of EPS pattern or high pouring temperature, led to long fluidity length of the melt. The distances of melt flow stop were predicted based on the heat transfer from the molten metal to the mold through the coat using measurement melt velocity values. The predicted values more or less agreed with experimental values for fluidity length.

This Paper was Originally Published in Japanese in J. JFS 88 (2016) 192-197.

[doi:10.2320/matertrans.F-M2017803]

(Received 2016/10/26; Accepted 2017/01/06; Published 2017/03/25)

Keywords: expendable pattern casting process, aluminum alloy, thin wall casting, fluidity length, coat permeability

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