Die-casting machine

Abstract

The die-casting machine comprises a sleeve in which an oil flow path has been formed. an oil tank, an inlet line, an outlet line, a purge line, and a controller to discharge the oil from the sleeve by sending the inert gas from the purge line to the oil flow path prior to replacement of the sleeve.

What is claimed is: 
     
         1 . A die-casting machine comprising:
 a sleeve in which an oil flow path is provided;   an oil tank that stores oil;   an inlet line that leads the oil output from the oil tank to the oil flow path;   an outlet line that leads the oil output from the oil flow path to the oil tank;   a purge line that merges with the inlet line and leads an inert gas to the oil flow path by way of the inlet line; and   a controller that discharges the oil from the sleeve by sending the inert gas from the purge line to the oil flow path prior to replacement of the sleeve.   
     
     
         2 . The die-casting machine according to  claim 1 , further comprising:
 a gas source that stores or generates the inert gas; and   a gas line that leads the inert gas to molten metal, wherein the controller switches a communication destination of the gas source to the purge line or the gas line.   
     
     
         3 . The die-casting machine according to  claim 1 , wherein the controller stores a predetermined purge time in advance, and continues supply of the inert gas by way of the purge line for a purge time.