Metal founding – Control means responsive to or actuated by means sensing or... – Responsive to thermal condition
Patent
1977-10-31
1979-07-31
Baldwin, Robert D.
Metal founding
Control means responsive to or actuated by means sensing or...
Responsive to thermal condition
164 60, 164126, 164338M, 164348, B22D 2704, B22D 1500
Patent
active
041627008
ABSTRACT:
This disclosure covers a process and mechanisms for controlling the temperature and heat balance of molds. More particularly, this invention relates to molds with built-in devices for heating and cooling various regions within molds. These devices are so constructed that each device is capable of heating and cooling independent of the other devices. The intensity of heating and cooling of these devices can be varied by regulating the flow of the heating/cooling medium in impulses for variable intervals of time. Prior to filling of the mold, the mold is heated to the desired working temperature by injecting a heated medium into the various heating/cooling devices. During or immediately after filling the mold, the flow of the heated medium to the device furthest from the casting riser (feeder) is discontinued and is replaced by a flow of cooling medium. When the material within the mold in the immediate vicinity of this device is solidified, the flow of cooling medium to this device is decreased or stopped. The remaining heating/cooling devices are then sequentially activated in the same manner as the first with activation occurring in a direction toward the casting riser. Thus, solidification is controlled in a directional manner so that it progresses from the region in the mold furthest from the casting riser toward the riser.
REFERENCES:
patent: 3417809 (1968-12-01), Sink
patent: 3633656 (1972-01-01), Saunders
Baldwin Robert D.
Wells Gilbert L.
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