| 摘要 |
A method of controlling plasticization in an injection molding machine, wherein a plasticization state of resin in an injection cylinder at the time of metering is controlled by detecting a turning force of a screw. A reference screw turning force C or F required for a desirable metering operation is decided. The upper limit D and the lower limit E in an allowable range of a screw turning force, in which a normal metering should be expected, are set for each position of the screw on the basis of the reference screw turning force C or F and are stored in an allowable value storage file. During the execution of the metering operation, a turning force V working on the screw is successively detected, and, if the turning force V is not between the upper limit D and the lower limit E in an allowable range corresponding to the current position of the screw, it is assumed that abnormal plasticization has occurred, and an abnormal state alarm is issued. Thus, insufficient heating of the injection cylinder, the mixture of foreign matters in a molding material, short supply of resin and the like can be accurately detected. <IMAGE> |
