Method of injection control for injection molding machine

Details Method of injection control for injection molding machine Method of injection control for injection molding machine

1996-04-01

1998-10-06

Heitbrink, Tim

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 405, 364476, 425145, 425149, B29C 4777

Patent

active

058172580

ABSTRACT:
Over the whole range of the injection process, standard injection speeds and pressures are set and sections for injection speed control and sections for pressure control are set according to the length of time t, screw position S, or injection pressure P, each after the start of injection, or following the combination of the length of time and the screw position or of the length of time and the injection pressure. The arrival at the point of changeover from one control section to another is followed by a control mode shift. If the shift is made for speed control, injection speed is controlled in a manner such that actual injection speed may agree with one standard injection pressure, while if pressure control is selected by the shift, there is provided feedback control which is put into practice so that actual injection pressure may coincide with one standard injection pressure. During the injection process, injection control is effected by speed control or pressure control, whichever is optimal for each of respective sections, whereby stabilized injection molding may be assured.

REFERENCES:
patent: 4735760 (1988-04-01), Kumazaki
patent: 5102587 (1992-04-01), Kumamura et al.
patent: 5154935 (1992-10-01), Kamiguchi et al.
patent: 5336073 (1994-08-01), Hiraoka
patent: 5342559 (1994-08-01), Kamiguchi et al.
Patent abstract, Japanese Patent Application 5-192969 dated Aug. 3, 1993.
Patent Abstract, Japanese Patent Application 5-245899 dated Sep. 24, 1993.

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