Injection molding machine with regenerative feed system

Details Injection molding machine with regenerative feed system Injection molding machine with regenerative feed system

B - Operations, Transporting

29

C

18/701

B29C 45/82 (2006.01)

Patent

CA 1118975

INJECTION MOLDING MACHINE WITH REGENERATIVE FEED SYSTEM ABSTRACT OF THE DISCLOSURE An injection molding machine having a ram for injecting a settable material into an associated mold includes a hydraulic actuator formed by a piston and cylinder assembly which displaces the ram during the injection operation. The piston is an unbal- anced are piston which permits the ram to be displaced in both a regenerative and a nonregenerative feed mode. Fluid controls for operating the piston and cylinder assembly include a regeneration valve in fluid communication through the cylinder with opposite sides of the unbalanced piston to permit regenerative feed of the piston and ram in one valve position or to permit nonregenerative feed in an another valve position. Displacing the ram in the regen- erative or nonregenerative modes of operation allows the mold to be filled at different rates or pressures.

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