Die cast vacuum valve

Metal founding – Means to apply vacuum directly to work or to hold or...

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Details

164305, B22D 1714, B22D 1720

Patent

active

055380697

ABSTRACT:
A valve for a vacuum die casting machine has a cover die block and an ejector die block. A slotted member and an abutting slotless member abutting the slotted member are movable between an open, fluid-passing position and a closed, fluid-blocking position. A controller directs movement of the valve between the open and closed positions. The valve is moved to its open position as the air within the cavity and associated lines is being evacuated and is moved to its closed position as the shot is injected into the die cavity. The slotted and slotless members may either be rotatable drums or elongated bars. The slotted drum includes a slotted end and an actuation end. Similarly, the slotted elongated bar includes a slotted end and an actuation end. Alignment of the slot of either the rotatable slotted drum or the movable slotted bar with the vacuum passage allows the passage of fluid.

REFERENCES:
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patent: 3590114 (1971-06-01), Uhlig
patent: 4027726 (1977-06-01), Hodler
patent: 4099904 (1978-07-01), Dawson
patent: 4463793 (1984-08-01), Thurner
patent: 4577670 (1986-03-01), Moore
patent: 4680003 (1987-07-01), Schulte et al.
patent: 4938274 (1990-07-01), Iwamoto et al.
patent: 4995445 (1991-02-01), Shigyo
patent: 5101882 (1992-04-01), Freeman

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