| 摘要 |
<p>A method of manufacturing a low melting-point metal core is provided, which consists of fitting a loose piece 6 having a built-in heater 5 in a mold 4, casting molten metal by pushing it up from a furnace into the cavity of the mold 4 to fill it, keeping the mold in a filled state for a given time, and stopping the casting step at a time at which the molten metal at the central part of the cavity is still unsolidified, so as to have the unsolidified molten metal fall freely into the furnace.</p> |
