Abstract
Distribution of metal flow in multiple ingate systems for cast iron was studied. The results obtained are summarized as follows.
1) When all the gates have the same dimensions, more metal passes through the gates at longer distances from the sprue bottom. This tendency becomes remarkable, when the gating ratio is large. In a divergent system, the quantity of metal flowing through ingate at the neighborhood of the sprue bottom is small, which is due to the fact that the runner is not filled with molten metal and the flow is agitated.
2) Flowrates through ingates are almost proportional to the back pressure of the ingate. This means that the flow behavior is controlled by Bernoulli's law. The metal distribution ratio calculated by use of the coefficient of tube friction: 0.03, and the loss coefficient of bending: 0.7, coincides with that experimentally obtained in a shell mold gating system.
