COMPUTER SIMULATION OF THE MOLD HEATING AND COOLING CONTROL LOOP, USING CONVENTIONAL CONTROL STRATEGIES

摘要

The mold heating and cooling project was started in 1969 in an effort to develop direct metal temperature control for injection and compression molds used to make plastic parts. In 1971, a direct digital control (DDC) computer system was installed to control two- and four-zone fluid temperature loops which control the mold temperature response. Investigation of various ways of accomplishing direct metal temperature control was reported in May 1970. The control system operation and theory were dis¬cussed in reports issued in June 1971 and in September 1972, and experimental model results were presented in a report issued in August 1974.