Method and apparatus for controlling mold clamping force based o

Details Method and apparatus for controlling mold clamping force based o Method and apparatus for controlling mold clamping force based o

1998-06-22

2000-01-11

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

425149, 425150, 4254519, 425595, B29C 4582

Patent

active

060132116

ABSTRACT:
Mold clamping method and apparatus wherein a mold closing chamber of a mold clamping device is supplied with a pressurized fluid delivered from a hydraulic power source through a servo valve, to close a mold, and a mold clamping chamber independent of the mold closing chamber is also supplied with the pressurized fluid through the servo valve and a switch valve opened upon completion of the mold closing action, to thereby clamp the mold, and wherein a controller is provided to obtain a mold clamping force on the basis of a sum of a first force based on a fluid pressure in the mold closing chamber and a second force based on a fluid pressure in the clamping chamber, and feedback-control the servo valve such that the obtained mold clamping force coincides with a desired value.

REFERENCES:
patent: 4111629 (1978-09-01), Nussbaumer
patent: 4942004 (1990-07-01), Catanzaro
patent: 5129806 (1992-07-01), Hehl
patent: 5849225 (1998-12-01), Ebina

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