B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/172, 22/69
B22D 17/10 (2006.01)
Patent
CA 1153532
ABSTRACT OF THE DISCLOSURE The method for cooling a plunger tip in a die casting machine of the cold chamber type comprises forcibly cooling the inner hollow space in the plunger tip by applying a flow of cool- ing fluid into and out of the inner hollow space during the time from about the commencement of the injection of the molten metal into the cavity of the moulds of the die casting machine by the forward stroke of the plunger to the commencement of the return stroke of the plunger, and applying, after terminating the supply of the cooling fluid to the inner hollow space of the plunger tip, a flow of pressurized gas into and out of the inner hollow space of the plunger tip during the time at least necessary for expelling the remaining cooling fluid from the inner hollow space of the plunger tip so as to prevent excessive cooling and permit the plunger tip to be subjected to uniform natural cooling by the pressurized gas. The device for carrying out the above described cooling of the plunger tip comprises a cooling fluid source and a pressurized gas source, and control means for alternately supplying cooling fluid for a predetermined time period and pressurized gas from the source of the pressurized gas for a predetermined time period into the inner hollow space of the plunger tip in timed relationship to the actuation of the stroke of the plunger tip for effecting the die casting cycle of operation.
347971
Miki Isao
Nagi Tsutomu
George H. Riches And Associates
Nippon Light Metal Co. Ltd.
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