Method for preventing leaking of molten metal in injection molding of metal material
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United States of America Patent
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Dec 8, 2009
Grant Date -
Apr 9, 2009
app pub date -
Oct 2, 2008
filing date -
Oct 3, 2007
priority date (Note) -
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Abstract
A method of preventing leaking of molten metal from a nozzle in an injection apparatus comprising, metering the molten metal by travel of a plunger head backward from a most forward position to a most backward position at the rear of a supply opening while maintaining nozzle contact after completion of an injection step and supplying molten metal from a furnace into a cylinder body through the supply opening, after completion of the metering, closing the supply opening by travel of the plunger head forward at a low speed from the backward position to a stand-by position ahead of the supply opening for cutting off the communication between the molten metal in the cylinder body and the molten metal in the furnace.
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