INJECTION MOLDING CONTROLLER WITH PROCESS VARIABLE LEARNING

摘要

A controller for an injection molding machine controls the injection ram by means of profiles (350) having segments with programmable setpoints. The injection molding machine is initially controlled during each segment in an open-loop manner (354). Closed-loop control (352) is then adopted. The difference between the process signal, e.g. ram velocity, and the setpoint at the end of each segment is used to change the current setpoint to improve the open-loop accuracy over time. The learning (353) rate of change of the open-loop setpoints decreases after the initial correction.