Method of die casting

Details Method of die casting Method of die casting

B - Operations, Transporting

22

D

22/172

B22D 17/32 (2006.01)

Patent

CA 1223428

METHOD OF DIE CASTING Abstract of the Disclosure The method of die casting using a plunger tip of a reciprocal plunger for forcibly rejecting the molten metal supplied to the inner space of a sleeve into the mold cavity through a spool bush connected therebetween includes measur- ing the temperature of at least a portion of at least one of the plunger tip, the sleeve and the spool bush, and commencing retracting of the plunger on the basis of the measured temperature after each shot of die casting. The measured temperatures of the plunger tip, the sleeve and/or the spool bush may be utilized for operation of calculating the clearance at the peripheral surface of the plunger tip and the retracting of the plunger is commenced at the time the calculated clearance is ascertained to reach a predetermined set value of clearance. The temperature dif- ference between the measured temperatures may be compared with a set temperature difference calculated so as to correspond to a predetermined set value of clearance at the peripheral surface of the plunger tip. The retracting of the plunger may be withheld until a set time is reached, which set time is set so as to insure sufficient time for removal of the fins or flashes around the plunger tip upon removal of the cast product from the mold cavity. Alterna- tively, the plunger is forcibly retracted even though the temperature of the plunger tip does not descend by a set temperature at the lapse of another set time to be thought sufficient to retract the plunger as controlled by the method of the present invention under the normal conditions and, at the same time, an alarm is actuated so as to expedite the repairing operation.

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