Method of controlling cylinder speed in injection molding appara

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...

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164457, B29C 4577, B22D 4600

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active

046108319

ABSTRACT:
A method of controlling the speed of a piston in an injection molding or die casting machine utilizing a flow rate change characteristic inherent in a hydraulic pressure circuit including a cylinder and a flow rate adjusting valve. The characteristic effects the operation delay due to the compressibility and inertia of the oil and other factors, in changing the speed or the flow rate of a operation oil from a lower value to a higher value. The characteristic is formulated in time or piston stroke expressed by a function of the speed or the flow rate between the lower and higher values under an actuation pattern of the valve in which the valve opening is forced to change at a constant velocity. A flow rate adjusting signal to actuate the valve is emitted with an advanced timing calibrated in the time or the piston strokes, which timing is computed by a computer based on the characteristic function at a predetermined valve actuation pattern with predetermined lower and higher speeds and a predetermined stroke at the higher speed being given as inputs to compensate for the operation delay.

REFERENCES:
patent: 4240996 (1980-12-01), Hunkar
patent: 4248040 (1981-02-01), Kast
patent: 4330026 (1982-05-01), Fink
patent: 4349324 (1982-09-01), Neff et al.
patent: 4411609 (1983-10-01), Yoshii et al.
patent: 4493362 (1985-01-01), Moore et al.

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