| 摘要 |
A shot sleeve assembly for a die casting machine having an outer cooling sleeve adapted to be mounted on one of the machine platens. An inner shot sleeve is positioned within the outer sleeve and communicates with the cavity of the die assembly mounted on the platen. The outer diameter of the inner shot sleeve is slightly smaller than the inner diameter of the outer cooling sleeve when the sleeves are at substantially the same temperature. The outer sleeve has a plurality of cooling passages extending axially thereof through which circulates a cooling fluid so that the outer sleeve remains at a substantially lower temperature than the shot sleeve when the die casting machine is in operation. The molten material which is supplied to the shot sleeve for subsequent supply to the die cavity causes the shot sleeve to heat up to a relatively high temperature and expand. Since the outer sleeve is cooled and maintained at a substantially lower temperature, the inner sleeve expands to create engagement thereof with the outer sleeve. However, when the machine is nonoperational and is at substantially room temperature, the inner shot sleeve can be slidably removed from the back or rear side of the platen without requiring removal of the outer sleeve.
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