Control method of injection molding machine

Details Control method of injection molding machine Control method of injection molding machine

1995-04-14

1996-09-10

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 69, 26432813, 425145, 425166, B29C 4577

Patent

active

055543260

ABSTRACT:
A control method of an injection molding machine includes the steps of advancing a screw 2, injecting and filling the resin in a barrel cylinder 3 into a mold 4 to fill the mold, and then applying a predetermined holding pressure to the resin in the mold 4. The control method further includes the steps of performing an injecting and filling by using an injection cylinder 5 having a double-rod piston 6 which can advance and retreat the screw 2, and then controlling the injection cylinder 5 by a controlling signal Dc including a predetermined alternating current signal in such a manner that the screw 2 is reciprocated in a longitudinal direction as a center with an advance finish and. stop position Xs and a position at which the screw is moved so as to retreat by a predetermined distance from the advanced finish and stop position Xs. Thereby, the mold failure such an overpack and a burr is eliminated.

REFERENCES:
patent: 4846651 (1989-07-01), Matsuda et al.
patent: 5202066 (1993-04-01), Furusawa et al.
patent: 5482662 (1996-01-01), Nakamura et al.
patent: 5494427 (1996-02-01), Arai

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