Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1980-06-11
1981-05-26
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
425406, B30B 1516
Patent
active
042695805
ABSTRACT:
Predominately hydraulic controls with an optional electrical feedback loop for a compression molding press is provided for a press having the main force provided by four hydraulic cylinders one at each corner of the ram and a fifth cylinder at its center. A hydromechanical servo valve at each corner of the press each in conjunction with a position gauge rod controls the adjacent cylinder to keep the ram parallel with the bed and an averaging valve applies the average pressure of the corner cylinders to the central cylinder. A servo controlled position motor synchronously moves each of the hydromechanical valves with respect to the ram to affect position and velocity control of the ram. A force comparator samples the average cylinder pressure to establish a maximum pressure and to override the position control when that maximum pressure is approached. The electrical control senses the position of the servo controller to compare press position to a preset program and to control the servo accordingly.
REFERENCES:
patent: 3719445 (1973-03-01), Sindelar
patent: 3881852 (1975-05-01), Ahrweiler
patent: 3901635 (1975-08-01), Greenberger
patent: 3994648 (1976-11-01), Kornylak et al.
patent: 4076780 (1978-02-01), Ditto
patent: 4157066 (1979-06-01), Pretty
Flint, Jr. J. Howard
General Motors Corporation
Hill Warren D.
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