METHOD FOR DISCRIMINATING THE QUALITY OF RESIN WORKPIECE IN A COMPRESSION-MOLDING PROCESS

摘要

A method of deciding the quality of a SMC workpiece (34) in compression-molding the SMC workpiece (34) on a compression-molding press which compression-molds the SMC workpiece (34) in a cavity (13) formed between a pair of molds (11, 12) by moving at least one of the pair of molds by hydraulic cylinder actuators (4, 7) includes detecting the hydraulic pressure PO of the working fluid supplied to the hydraulic cylinder actuators (4, 7) upon the arrival of the moving mold (11) at a predetermined position; comparing the detected hydraulic pressure PO with a predetermined optimum hydraulic pressure PN to determine the deviation DELTA PO=PN-PO; deciding the quality of the SMC workpiece (34) on the basis of the deviation DELTA PO, and interrupting the compression-molding /peration to avoid producing defective moldings when it is decided that the quality of the SMC workpiece is nonconforming or executing an automatic control operation to add a predetermined pressure correction DELTA P corresponding to the deviation DELTA PO to the detected hydraulic pressure PO.