Injection pressure control apparatus for a die cast machine and

Details Injection pressure control apparatus for a die cast machine and Injection pressure control apparatus for a die cast machine and

1989-03-29

1990-09-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Molding pressure control means responsive to pressure at...

164151, 164154, 264 401, 425156, 425170, B29C 4582

Patent

active

049540637

ABSTRACT:
This invention relates to an injection pressure control apparatus for a die cast machine and an injection mold machine. In the injection pressure control apparatus, it detects whether the pressure increase state of the instance when the pressure of the injection cylinder is increased through a pressure increasing circuit is normal or not. When detecting the above state, the pressure change obtained at the instance when the pressure increasing circuit is operated is detected between two points, of which it is determined whether the time spent therebetween is within an allowable time or not and the result is indicated. Moreover, the pressure detected after the pressure increasing circuit was operated and a predetermined period of time has passed is determined whether it is within a predetermined allowable range or not and the result thereof is indicated. Further, in the injection pressure control apparatus for the injection mold machine, it is deteted whether the detected pressure value at the instance when the pressure of the injection cylinder is increased and a predetermined measurement command signal is given is within an allowable range or not and the result thereof is indicated.

REFERENCES:
patent: 3941534 (1976-03-01), Hunkar
patent: 4161380 (1979-07-01), Bishop
patent: 4207047 (1980-06-01), Kolb et al.
patent: 4208176 (1980-07-01), Salerno
patent: 4426341 (1984-01-01), Tsuzuker et al.
patent: 4708620 (1987-11-01), Brugger
patent: 4744743 (1988-05-01), Puschel et al.

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