Controller for injection molding machine

Details Controller for injection molding machine Controller for injection molding machine

2008-03-18

2008-03-18

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

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

Feed control of material en route to shaping area

C425S149000, C425S150000

Reexamination Certificate

active

11385895

ABSTRACT:
A controller of an injection molding machine which compensates a delay in an injection velocity changeover and a delay at the time of changeover to the pressure-holding process, and is capable of more accurate and stable injection velocity control and changing control from the injection velocity control to pressure control. In the injection process, a motion command is outputted in every sampling period τ according to the command injection velocity. When a screw position overshoots the set velocity changeover positions Psw(2) and Psw(1), a motion command based on a velocity command of the next interval is outputted from the next period. However, there is time lag between the point when the set changeover position is reached and the point when the motion command is changed after detection thereof. There generates a motion deficiency in a motion amount shown by mark A and overshoot shown by B. Motion commands of the next period or the next and subsequent several periods are compensated with errors in the motion amount caused by the time lag used as compensation amounts A′ and B′. The generated error motion amount is immediately compensated, which enables accurate velocity changing control. By performing the compensation in the same manner when the injection velocity control is switched to the holding pressure control, it is possible to suppress the peak pressure and the dispersion.

REFERENCES:
patent: 3930774 (1976-01-01), Brand et al.
patent: 4135873 (1979-01-01), Sone et al.
patent: 4841208 (1989-06-01), Itoh
patent: 5736080 (1998-04-01), Suganuma
patent: 8-323824 (1996-12-01), None
patent: 2002-28960 (2002-01-01), None
patent: 2005-35039 (2005-02-01), None

Affiliated with

Also associated with

Rating

Controller for injection molding machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Controller for injection molding machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controller for injection molding machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3931939