Mold cavity gas removal system with valve position sensor

Details Mold cavity gas removal system with valve position sensor Mold cavity gas removal system with valve position sensor

1988-10-19

1989-06-06

Lin, Kuang Y.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164305, 164410, 425420, 425812, B22D 1714

Patent

active

048362727

ABSTRACT:
A gas removal system for a mold cavity of a die casting or other molding machine includes a valve movable to an open position to interconnect the mold cavity to a gas venting or evacuating device or to a closed position. A portion of the valve is movable relative to a fluid pressure supply inlet port to establish a first pressure condition represented by back pressure in the supply line when the valve is in one of the open or closed positions and a second pressure condition represented by substantial absence of back pressure in the supply line when the valve is in the other of those positions. The presence or absence of back pressure in the supply line is sensed to determine valve position. A control unit compares the second valve position and a scheduled valve position and indicates when the valve is improperly positioned to prevent injection of a melt into the mold cavity.

REFERENCES:
patent: 4463793 (1984-08-01), Thurner
patent: 4538666 (1985-09-01), Takeshima et al.

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