| 摘要 |
A method of casting a hollow bar which includes a mold having a mandrel therein and means for distributing molten material to the mold inlet in an area between the mold and the mandrel. Initially a starting plug closes the mold outlet to prevent leakage of the molten material and provides means to join the plug and solidified melt. After the molten material freezes in the annulus around the mandrel, the starting plug is lowered at a controlled rate to draw the solidified hollow bar from the mold outlet as additional molten material is fed through the inlet. An air inlet into the hollow of the cast bar prevents the formation of a vacuum within the hollow. Further, means are provided for cooling the mold to quickly freeze the molten material as it is fed into the mold. The starting plug includes structure for locking itself to the cast bar.
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