Mold closing unit of an injection molding machine

Details Mold closing unit of an injection molding machine Mold closing unit of an injection molding machine

1984-08-01

1986-08-12

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

264 405, 4254512, 425590, 425DIG223, B29C 4568

Patent

active

046053670

ABSTRACT:
A mold closing unit of an injection molding machine has a hydraulic traveling cylinder and a hydraulic mold closure retention cylinder for the movable mold clamping plate. One-half of a divided injection mold is clamped on the plate and defines with a fixed mold die a mold cavity having a larger volume at the commencement of the mold charge than at the termination of the mold charge. A threaded spindle is engaged with the movable mold clamping plate through a spindle nut, and the spindle is freely rotatable in the stationary mold clamping plate and is connected with a stepping motor. A 4/2-way valve is arranged in the hydraulic supply line leading to the traveling cylinder, and its valve body is axially shiftable on the spindle. The stepping motor is controlled depending on a specified pressure and/or speed pattern as a function of the distance between the mold halves or the mold clamping plates.

REFERENCES:
patent: 3564659 (1971-02-01), Koch et al.
patent: 3677685 (1972-07-01), Aoki
patent: 3797364 (1974-03-01), Schulze
patent: 3825235 (1974-07-01), Schwertfeger et al.
patent: 3857658 (1974-12-01), Muzsnay
patent: 3940930 (1976-03-01), Rosander
patent: 3941534 (1976-03-01), Hunkar
patent: 4009983 (1977-03-01), Jacobs
patent: 4253358 (1981-03-01), Schulze
patent: 4540359 (1985-09-01), Yamazaki
Hartmann and Laemmle KG, entitled "Electro-Hydraulic Linear Amplifiers LVS, 10th Edition 1977.

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