Method of controlling injection molding machine with hydraulic l

Details Method of controlling injection molding machine with hydraulic l Method of controlling injection molding machine with hydraulic l

1990-06-14

1992-03-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 405, 425145, 425149, 425150, B29C 4582

Patent

active

050930524

ABSTRACT:
An injection molding machine for manufacturing plastic moldings contains a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of the pumps are respectively connected to the hydraulic loads. At least one alternating-current servomotor is provided for driving the pumps. In a method of controlling hydraulic drives of the foregoing machine, the measured value of a subassembly is detected and compared with a desired value; any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the mentioned desired velocity value.

REFERENCES:
patent: 3422648 (1969-01-01), Lemelson
patent: 3698846 (1972-10-01), Leutner
patent: 3721512 (1973-03-01), Ma et al.
patent: 3893792 (1975-07-01), Laczko
patent: 4120922 (1978-10-01), Lemelson
patent: 4257755 (1981-03-01), Lemelson
patent: 4565511 (1986-01-01), Ramisch

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