Control device for injection molding machine

Details Control device for injection molding machine Control device for injection molding machine

2007-12-25

2007-12-25

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

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

Mold motion or position control

Reexamination Certificate

active

10546196

ABSTRACT:
A control device includes: a memory29rfor storing, in a process from a mold tool10being open until being closed, the value X(t) of a current flowing in a motor3at multiple points in time synchronized to the closing command signal; a mean-and-variance calculating for each of the points in time means for calculating a mean value Mx(t) and a variance value Vx(t) that correspond to current values X(t) that have been read from the memory29r; a threshold calculating means for calculating a current threshold Xf(t) for each of the points in time using the mean value Mx(t) and the variance value Vx(t) from an arbitrary number of times up to (A−1) times, according to the following equation: Xf(t)=Mx(t)+N·{Vx(t)}1/2where N is a constant and not less than 3; anda foreign object determining unit29for comparing the current threshold Xf(t) and the current value X(t) at each of the points in time to determine whether there is an abnormality according to whether the current value X(t) exceeds the current threshold Xf(t) a predetermined number m of times.

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