真空吸引式試験によるADC12合金の流動長と流動停止時間の実験的検討

概要

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Suction tests are carried out under the various molten metal temperature, suction pressure and cavity thickness conditions; and the effects of these parameters upon the fluidity length and the time taken for flow stoppage are investigated. The time taken for flow stoppage is determined by the pressure change comparison method that is proposed in the present study. The results are as follows. In a high suction pressure condition, where the inertial force is relatively greater than surface tension, a projection is formed at the front of molten metal flow. The fluidity length from the bottom to the tip is increased monotonously with an increasing in the suction pressure; however, an increase in the length between the bottom and the root of the projection becomes gradual in the high suction pressure condition. The time taken for flow stoppage is decreased as the suction pressure increases. The fluidity length and the time taken for flow stoppage are expressed as non-dimensional correlation equations.
2010-01-25