A Temperature-Dependent Adaptive Controller.Part I:Controller Methodology and Open-Loop Testing

摘要

Currently,the controllers for achieving a desired injection velocity setpoint profile are independent of processing conditions in plastic injection molding.The dynamics of the reciprocating screw during injection mold filling is complex and temperature-dependent.This complexity is based on process parameters that are nonlinear,which can vary spatially in time.Open-loop tests were performed on two polymers at three melt temperatures and three mold-fill velocity regimes:low,medium,and high.These tests were based on close-loop injection mold-fill setpoints and a derived voltage velocity relationship for the injection velocity hydraulic valve.The results of the open-loop tests show that mold-filling injection velocity is polymer-and melt temperature-dependent.