Abstract
The investigation was carried out as to the metal flow in top, bottom, and step gates. Fine wire of high electric resistance is inserted in a mould space where the metal is filled, and the change of wire resistance caused by the flow of metal is recorded by Braun tube oscillograph. The experiment was carried out with pure aluminium cast at 750° into a green sand mould. The results are as follows: [1.] The shape of a gate attached to the pouring basin affects the metal flow remarkably. [2.] In top gate casting, flowing metal increases if the gate is longer, but there is a limit at which the flow is made constant. [3.] When a part of the gate is opened to the air within a certain length, the flowing metal decreases in volume. [4.] In bottom gate casting, the metal enters into the mould principally by a statical pressure head of metal in the gate.The flowing volume varies according to the size of bottom runner and is largest when the section of runner is 80% of that of the gate. [5.] In step gate casting, the entering time into the higher runner varies according to the size of the lower runner.
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