Electro-hydraulic ram control apparatus

Details Electro-hydraulic ram control apparatus Electro-hydraulic ram control apparatus

1980-05-27

1982-04-20

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

425145, 425149, B29F 106

Patent

active

043258964

ABSTRACT:
A control system for the ram of a hydraulic injection molding press, the injection speed or velocity of which is to be precisely controlled according to a predetermined velocity command signal. A programmable relief valve is used to effect accurate control over the flow of hydraulic fluid under pressure to the ram cylinder and is responsive to signals representing diverse conditions of operation of the press. In one application of the concept, velocity and subsequent holding pressure control of a ram are obtained.

REFERENCES:
patent: 3726334 (1973-04-01), Sallberg
patent: 3870445 (1975-03-01), Hold

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