Method for taking countermeasures against faulty molding in an injection molding machine

摘要

A method for taking countermeasures against faulty molding in which, with the aid of an expert system, restoration to a nondefective molding condition when faulty molding takes place during the mass production of molded products. When threshold values of a plurality of molding parameters, and information indicative of countermeasure processes, respectively corresponding to combinations of evaluations on these parameters and determined on the basis of the knowledge and experiences of skilled persons, are manually entered through a data input device (119) , they are stored in tables of a memory (110) beforehand under the control of a processor (114). Upon start of the mass production, the injection time, metering time and cushion amount which are measured or calculated during a molding cycle, and the resin pressures corresponding to the manually set screw positions at the time of passing the gate and filling are set in the tables as reference values of the parameters. Upon occurrence of faulty molding, the processor makes an evaluation on each parameter by comparing the deviation between each parameter value in the molding cycle accompanied with the faulty molding and its reference value with threshold values, and changes desired ones of parameter values forming the molding condition, in accordance with a countermeasure process that has been read from the tables in dependence on results of the evaluations.