| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing leaking of molten metal from a nozzle of an injection apparatus for metal forming with a plunger therein by operation of the plunger without installing a control system for a nozzle temperature or a valve mechanism. SOLUTION: This injection apparatus for metal forming is equipped with the plunger movable in cylinder body having the nozzle on its tip and a furnace for melting and holding metallic material provided above a feeding port drilled at the upside of the cylinder body. In the apparatus, the plunger is forcibly set back from its advance limit position to its retreat position located at the rear of the feeding port, while maintaining nozzle touch after completion of injection process. Then molten metal in the melting/holding furnace is flowed into the cylinder body and measured. After completion of measuring, the plunger is moved forward at low speed from its retreat position to waiting position located at the front of the feeding port to close the feeding port. Consequently molten metal between the cylinder body and the melting/holding furnace is blocked off to prevent molten metal leakage from the nozzle. COPYRIGHT: (C)2009,JPO&INPIT
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