Die casting machine

Abstract

The die casting machine includes a main circulation channel through which a coolant for cooling the die circulates, a main pump that sends the coolant to the main circulation channel, a sub-circulation channel through which the coolant circulates and flows, a sub-circulation channel that is shorter than the main circulation channel, and a sub pump that sends the coolant to the sub-circulation channel.

What is claimed is: 
     
         1 . A die casting machine comprising:
 a main circulation channel through which a coolant, for cooling a die, circulates;   a main pump that feeds the coolant to the main circulation channel;   a sub-circulation channel through which the coolant circulates, the sub-circulation channel being shorter than the main circulation channel; and   a sub-pump for feeding the coolant to the sub-circulation channel.   
     
     
         2 . The die casting machine according to  claim 1 , wherein:
 the main circulation channel includes an outbound channel for guiding the coolant toward the die, and a return channel for guiding the coolant exiting the die;   the sub-circulation channel branches from the return channel and merges with the outbound channel; and   the sub-pump is provided on the sub-circulation channel, and feeds the coolant from the return channel to the outbound channel via the sub-circulation channel.   
     
     
         3 . The die casting machine according to  claim 2 , further comprising a first check valve and a second check valve that are disposed in a vicinity of a merging point of the outbound channel and the sub-circulation channel, wherein:
 the first check valve is disposed on the outbound channel, at a position upstream of the merging point in a flow direction of the outbound channel; and   the second check valve is disposed on the sub-circulation channel, at a position upstream of the merging point in a flow direction of the return channel.   
     
     
         4 . The die casting machine according to  claim 1 , wherein output of the sub-pump is smaller than output of the main pump. 
     
     
         5 . The die casting machine according to  claim 1 , further comprising:
 a safety fence separating a non-work area and a work area;   a main flowmeter that is disposed in the work area and that measures a flow rate of the main circulation channel; and   a sub-flowmeter that is disposed in the non-work area and that measures a flow rate of the sub-circulation channel, wherein   part of the main circulation channel passes through the work area, and   the sub-circulation channel does not pass through the work area.   
     
     
         6 . The die casting machine according to  claim 1 , further comprising a controller, wherein following activation of the die casting machine, the controller causes the coolant to flow into the sub-circulation channel in an initial shot, and causes the coolant to flow into the main circulation channel in second and subsequent shots, or when temperature of the coolant flowing into the sub-circulation channel exceeds a reference value.