Development of an Online Quality Control System for Injection Molding Process

Abstract

We developed and implemented a control system for injection molding The purpose of this control system is to maintain the consistency of product weight by stabilizing the pressure curve The characteristics of the pressure curve in this paper are restricted to the viscosity index the peak pressure and the timing of the peak pressure First we performed ordinary experiments and found that the V-P switchover position and the injection speed were correlated with product weight and the pressure curve characteristics We added smartness to our control system through a neural network In order to adjust the process parameters such as injection speed and V-P switchover position for the next cycle we accumulated measurements of the viscosity index the peak pressure the timing of the peak pressure and the melt temperature from earlier cycles The variation of part weight decreased from 0 25% to 0 14% under the system control The potential uses of our control system include (1) the maintenance of stable product weight and (2) the reduction of transient behavior and abnormal operation due to material properties change

Date of Award	2019
Original language	English
Supervisor	Sheng-Jye Hwang (Supervisor)