Compact hydraulic drive for die closing unit of injection moldin

Details Compact hydraulic drive for die closing unit of injection moldin Compact hydraulic drive for die closing unit of injection moldin

1981-11-24

1983-04-19

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

4254512, B29F 106

Patent

active

043804276

ABSTRACT:
A hydraulic actuator assembly for a push-type die closing unit of an injection molding machine capable of producing rapid die opening and closing movements with a small volume of pressurized fluid and an elevated die closing pressure in the closed die position, the assembly comprising a central power cylinder with a selectively bypassable power piston and two parallel, diametrally oppositely arranged single-acting travel cylinders. The low-pressure space on the forward side of the power piston is open to the pressure spaces of the two travel cylinders, and the total effective area of these pressure spaces is larger, by a relatively small amount, than the area of the high-pressure space to the rear of the power piston, said small amount determining the fluid volume necessary for the opening travel. A stationary plunger cooperates with a central bore in the rear portion of the power piston rod to produce a small pressure space for the closing travel. An elevated die closing pressure is obtained by pressurizing the high-pressure space of the power piston and the plunger pressure space, with the power piston bypass closed.

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