Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1993-11-16
1996-01-09
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
2643281, 425145, B29C 4576
Patent
active
054826624
ABSTRACT:
When an injection speed (final control amount) of a screw as an object subjected to control which is controlled by an actuator, for example, an injection cylinder is controlled so as to be a set value of a previously set molding condition. An intermediate control amount for operating the injection cylinder, for example, a valve differential pressure of a servo valve is detected. An instruction value for operating and controlling the injection cylinder is determined by calculation processing by a computer functional unit on the basis of the detected valve differential pressure and the above-mentioned set value Vs. The determined instruction value is used to operate and control the injection cylinder. In addition, the injection speed is detected, and when a detected value of the detected injection speed reaches a previously set target value, feedback control is made on the basis of the detected value and the set value. Thereby the control similar to feedforward control is made in the transition period, while the feedback control is used together in the steady period, or switching to the feedback control only is performed.
REFERENCES:
patent: 4290986 (1981-09-01), Koschmann
patent: 4780256 (1988-10-01), Sasaki et al.
patent: 4849678 (1989-07-01), Kamiguchi et al.
patent: 5023028 (1991-06-01), Kamiguchi et al.
patent: 5093052 (1992-03-01), Wurl et al.
patent: 5258918 (1993-11-01), Giancola
Arai Tsuyoshi
Nakamura Nobuyuki
Heitbrink Jill L.
Nissei Plastic Industrial Co. Ltd.
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