Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1994-11-02
1996-09-03
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
264 406, 425144, B29C 4578
Patent
active
055518575
ABSTRACT:
A cylinder temperature controller for an injection molding machine in which an injection molding operation is performed while keeping the injection cylinder at a stable preset temperature regardless of disturbances such as the change of mold temperature or ambient temperature and the temperature rise caused by the shear compression of resin. A temperature regulator for carrying out PID feedback control of the injection cylinder temperature is provided with a PID adjusting means unit for automatic tuning. The actual temperature T of each portion of the injection cylinder is detected by a thermocouple. When the actual temperature T deviates from a predetermined temperature range defined by an upper limit [A+B] and lower limit [A-B] which are set on the basis of the preset target temperature A, an automatic tuning command is outputted to the temperature regulator. Upon receipt of this command, the PID adjusting unit sets the PID parameters again at a value suitable to the disturbance. By keeping the PID parameters to be suitable to the disturbance, the actual temperature T of each portion of the cylinder agrees with the preset target temperature A regardless of the change of the disturbance.
REFERENCES:
patent: 3870445 (1975-03-01), Hold et al.
patent: 5272644 (1993-12-01), Katsumata et al.
Fujioka Osamu
Miyauchi Tokuhisa
Neko Noriaki
Fanuc Ltd.
Heitbrink Tim
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