Method for monitoring operation data of an injection-molding machine
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United States of America Patent
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Jul 5, 2005
Grant Date -
Nov 28, 2002
app pub date -
May 21, 2002
filing date -
May 25, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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.
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