Abstract: A clamping apparatus is operable in a closure position detection mode for detecting closure of a mold on the basis of a change in a physical quantity because of closure of the mold, detecting a position of a crosshead of a toggle mechanism at the time of detection of the closure, and obtaining a closure position of a movable platen at the time of the closure from the detected position of the crosshead. The apparatus is previously operated in the closure position detection mode to store, as a reference value, the closure position at which a target mold clamping force is obtained. In the production operation, the apparatus is operated in the closure position detection mode to obtain an actual closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.

Abstract: A clamping apparatus is operable in a closure position detection mode for detecting closure of a mold on the basis of a change in a physical quantity because of closure of the mold, detecting a position of a crosshead of a toggle mechanism at the time of detection of the closure, and obtaining a closure position of a movable platen at the time of the closure from the detected position of the crosshead. The apparatus is previously operated in the closure position detection mode to store, as a reference value, the closure position at which a target mold clamping force is obtained. In the production operation, the apparatus is operated in the closure position detection mode to obtain an actual closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.

Abstract: In a foreign-object detection method for an injection molding machine, a trial mold closing operation is first performed. During the trial mold closing operation, a physical value related to mold closing operation is periodically detected in a monitor region, and a maximum deviation between the detected physical value and a preset theoretical value is obtained. The thus-obtained maximum deviation is added to a preset reference value to thereby determine a threshold value to be used for foreign object detection. During an actual mold closing operation, the physical value related to mold closing operation is periodically detected in the monitor region, and a deviation between the detected physical value and the determined theoretical value is calculated. A foreign object is judged to have been caught, when the deviation is in excess of the threshold value.

Abstract: In a foreign-object detection method for an injection molding machine, a trial mold closing operation is first performed. During the trial mold closing operation, a physical value related to mold closing operation is periodically detected in a monitor region, and a maximum deviation between the detected physical value and a preset theoretical value is obtained. The thus-obtained maximum deviation is added to a preset reference value to thereby determine a threshold value to be used for foreign object detection. During an actual mold closing operation, the physical value related to mold closing operation is periodically detected in the monitor region, and a deviation between the detected physical value and the determined theoretical value is calculated. A foreign object is judged to have been caught, when the deviation is in excess of the threshold value.