Injection molding same cycle control

Details Injection molding same cycle control Injection molding same cycle control

1975-05-12

1977-11-29

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425149, B29F 106

Patent

active

040603628

ABSTRACT:
The disclosure is directed to a combined same cycle and subsequent cycle control of an injection molding machine. Mold cavity pressure readings are accumulated and averaged during an initial cycle portion to generate a sensed average value which is compared to a setpoint reference to test for an error. The error signal so generated is used to immediately vary the hydraulic pressure driving the injection ram during the same cycle of machine operation to cause the sensed pressure profile to be corrected to a reference pressure profile. A further correction to the hydraulic pressure is enabled as cavity pressure readings are continued to a later event, averaged, and the resulting sensed value compared to a setpoint reference to enable a further correction to be implemented during the same cycle although its effect on the process is principally effective in the next subsequent cycle.

REFERENCES:
patent: 3767339 (1973-10-01), Hunkar
patent: 3773451 (1973-11-01), Bielfeldt et al.
patent: 3799719 (1974-03-01), Bonikowski et al.
patent: 3825386 (1974-07-01), Bello et al.
patent: 3840312 (1974-10-01), Paulson et al.
patent: 3859400 (1975-01-01), Ma
patent: 3860801 (1975-01-01), Hunkar
patent: 3893792 (1975-07-01), Laczko
patent: 3920367 (1975-11-01), Ma et al.
patent: 3932083 (1976-01-01), Boettner
patent: 3941534 (1976-03-01), Hunkar

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