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AssigneeToshiba Machine Co., Ltd.
InventorsAkira Yoshinaga, Makoto Nishizawa, Fumiyuki Kato, Jun Koike, Hiroshi Katsuta
Estimating the term…
The present invention is directed to a method of monitoring operation data for quality control with a little possibility that a nondefective product is mistakenly determined as a defective product even if the operation data fluctuates in a large waviness curve. Every time an operation data piece for quality control is obtained, a moving average of the predetermined number of data pieces lately obtained is calculated. When the deviation of a data piece from the moving average exceeds the tolerance limit, an alarm is generated. By employing the method of the present invention for monitoring operation data such as charging time, injection time and the amount of cushion in an injection-molding machine, the accuracy of determination as to a defective or nondefective can be improved.
A method of monitoring operation data of an injection-molding machine for quality control, comprising:
An injection molding machine having a monitoring unit, which calculates a moving average of a predetermined number of latest data pieces every time an operation data piece for quality control is obtained, and which generates an alarm when a deviation of the operation data from the moving average exceeds a predetermined tolerance limit.
Dependencies are inferred from the claim text.