Abstract
The purpose of this paper is to present an on-line moldability control system for the mulling process of molding sand. A microcomputer-aided equipment for water supply has been developed to improve the reliability of an actuator part of the system. Dynamic analysis has been done on the mulling process of molding sand with bentonite(clay) ratio 6 to 10%. An auto-tuning PID control algorithm is presented to provide a consistent control quality of sand whose conditions tend to vary widely from batch to batch. The system proved feasible through laboratory experiments with respect to both control precision and mulling time saving.
