Malfunction-detection method during die clamping step in injection molding machines

A method of detecting a malfunction during a die clamping step in an injection molding machine, the method being applied when performing die clamping by moving a movable platen toward a stationary platen, comprising:

• taking a reference pattern showing a relation between a die clamping force and a position of the movable platen when die clamping is normally carried out;
• setting one or more monitoring sections with respect to said position on the basis of the reference pattern, and setting, in advance, an allowable limit value of the die clamping force in the respective monitoring section in a form of a linear function of said position;
• and
• monitoring the die clamping force in the respective monitoring section during the die clamping step and, when its value exceeds said allowable limit value, deciding that a malfunction occurs and counting the number of times that a malfunction is detected;
• and
• issuing an alarm when the count of malfunctions detected in any monitoring section reaches a predetermined number for the section.

A method of detecting a malfunction during a die clamping step in an injection molding machine, the method being applied when performing die clamping by moving a movable platen toward a stationary platen, comprising:

• taking a reference pattern showing a relation between a die clamping force and a position of the movable platen when die clamping is normally carried out;
• setting one or more monitoring sections with respect to said position on the basis of the reference pattern, and setting, in advance, an allowable limit value of the die clamping force in the respective monitoring section in a form of a linear function of said position;
• and
• monitoring the die clamping force in the respective monitoring section during the die clamping step and, when its value exceeds said allowable limit value, deciding that a malfunction occurs and counting the number of times that a malfunction is detected;
• and
• issuing an alarm when the count of malfunctions detected within a predetermined time reaches a predetermined number for the respective monitoring section.