Molten metal admission control in casting

Details Molten metal admission control in casting Molten metal admission control in casting

1998-11-25

2000-07-11

Batten, Jr., J. Reed

Metal founding

Control means responsive to or actuated by means sensing or...

Control of feed material enroute to shaping area

164437, 1644505, 222602, 266 78, B22D 1118

Patent

active

060858281

ABSTRACT:
An opening 206 is provided in a system for delivering molten metal to the mold cavity 18 of a molten metal casting apparatus. A valve closure device 192, 196 is mounted at 198 to be reciprocated in relation to the opening 206 to control the flow of molten metal therethrough, and the driven end 206 of a bellows motor 208 is connected with the valve closure device at 258 to reciprocate the device in relation to the opening. A pair of concentric relatively inside and outside thimble-shaped chambers 238 and 240, 264 is circumposed about the bellows motor so that the bight portions thereof are opposed to the driven end of the motor, and interconnected with one another by a restricted liquid flow passage 270 in the screw 268. When fluid input signals are generated in the relatively outside chamber 240, 264, for the actuation of the closure device through the bellows motor, each signal is transmitted to the end of the bellows motor through the restricted liquid flow passage 270 and the relatively inside chamber 238. But when suction occurs in the opening 206 of the molten metal delivery system, the restricted liquid flow passage 270 substantially resists the transmission of relatively low pressure feedback signals to the fluid input signals from the driven end 260 of the bellows motor because of the restriction in the passage.

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