Malfunction-detection method during die clamping step in injection molding machines
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United States of America Patent
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Feb 28, 2006
Grant Date -
Aug 18, 2005
app pub date -
Apr 12, 2005
filing date -
Oct 23, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to a method of detecting a malfunction during a die clamping step in an injection molding machine. A reference pattern is taken which shows a relation between a die clamping force and a position of a movable platen when die clamping is normally carried out. One or more monitoring sections are set in advance with respect to that position on the basis of the reference pattern and an allowable limit value of a die clamping force in the respective monitoring sections is also set in advance in a form of a linear function of the position. The die clamping force is monitored in the respective monitoring section during a respective die clamping step and, when its value exceeds the allowable limit value, it is decided that a malfunction occurs and an alarm is issued.
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