Squeeze pin control method and apparatus for die casting machine

Details Squeeze pin control method and apparatus for die casting machine Squeeze pin control method and apparatus for die casting machine

1994-10-25

1996-09-17

Lin, Kuang Y.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164120, 164319, 1641542, B22D 1802, B22D 2711

Patent

active

055559247

ABSTRACT:
A stroke S of a squeeze pin under no load condition of a squeeze pin cylinder for driving the squeeze pin is detected. A value (S-.alpha.) obtained by subtracting a small value .alpha. from the detected stroke S of the squeeze pin is determined as a set stroke of the squeeze pin. After a predetermined waiting time has elapsed from when melted metal is charged into a cavity completely, the squeeze pin is advanced. Here, the actual stroke Sf of the squeeze pin is detected, and the detected stroke Sf is compared with set stroke (S-.alpha..+-..beta.), where .beta. is an allowable deflection. As the result of comparison, if Sf oversteps the set limits (S-.alpha..+-..beta.), at least one of parameters (the pressure and the flow rate of hydraulic fluid supplied to the squeeze pin cylinder and the waiting time) is corrected, so that the detected stroke value Sf approaches the set stroke (S-.alpha.) for the succeeding casting cycle.

REFERENCES:
patent: 4844146 (1989-07-01), Kikuchi
patent: 5161598 (1992-11-01), Iwamoto et al.

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