Arrangement for controlling an injection process of a die castin

Details Arrangement for controlling an injection process of a die castin Arrangement for controlling an injection process of a die castin

1985-08-08

1987-04-28

Godici, Nicholas P.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164113, 164155, 164312, 164315, B22D 1732

Patent

active

046606203

ABSTRACT:
An arrangement for controlling an injection process for a die casting machine comprising an injection cylinder connecting to a plunger tip, a hydraulic circuit arrangement which supplies pressurized hydraulic oil to the cylinder at a plurality of rates of flow, and a control unit applying to the hydraulic circuit arrangement a plurality of signals when the plunger tip comes to a plurality of positions so as to change the middle speed of the plunger tip during one injection process, the hydraulic circuit arrangement providing with a plurality of combinations among a valve of the type of a pilot operated check valve which mounts a flow rate setting unit with a mechanical stopper and two position directional valve operated by the signals, and a method for operating the die casting machine comprising the steps of pouring melted metal into the injection cylinder, moving the plunger tip at a low speed to a position at which the level of the melted metal in the cylinder reches up to a portion near an entrance to a cavity formed by the dies, then further moving the plunger tip at a middle speed, and moving the plunger tip at a high speed faster than the middle speed so as to mold the melted metal into whole of the cavity.

REFERENCES:
patent: 3964537 (1976-06-01), Koch et al.
patent: 4066189 (1978-01-01), Toyoaki et al.
patent: 4252176 (1981-02-01), Page

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