TY - JOUR
T1 - Optimal control of the part mass for the injection molding process
AU - Maderthaner, Jakob
AU - Kugi, Andreas
AU - Kemmetmüller, Wolfgang
PY - 2023/9
Y1 - 2023/9
N2 - Injection molding is one of the most important processes to manufacture plastic goods. During the long production times, process variations might lead to a varying product quality. Therefore, in the state of the art, the machine variables of injection molding machines (e. g. the barrel temperature and the screw speed) are controlled to suppress these variations. However, the influence of changes of the raw material on the part quality cannot be systematically suppressed with state-of-the-art controllers. In this work, a novel control concept is proposed where the part mass is controlled instead of the usual machine variables. The control strategy is based on an estimation of the plastics mass in the mold. In order to account for the system nonlinearities, a model predictive control strategy is developed for both the filling and the holding-pressure phase. The feasibility and the benefits of this proposed part-mass control strategy is evaluated by a series of measurements on an electric injection molding machine.
AB - Injection molding is one of the most important processes to manufacture plastic goods. During the long production times, process variations might lead to a varying product quality. Therefore, in the state of the art, the machine variables of injection molding machines (e. g. the barrel temperature and the screw speed) are controlled to suppress these variations. However, the influence of changes of the raw material on the part quality cannot be systematically suppressed with state-of-the-art controllers. In this work, a novel control concept is proposed where the part mass is controlled instead of the usual machine variables. The control strategy is based on an estimation of the plastics mass in the mold. In order to account for the system nonlinearities, a model predictive control strategy is developed for both the filling and the holding-pressure phase. The feasibility and the benefits of this proposed part-mass control strategy is evaluated by a series of measurements on an electric injection molding machine.
KW - Injection molding
KW - Part quality
KW - Part weight
KW - Part-mass estimation
KW - Model predictive control
KW - Quadratic program
KW - Measurements
UR - https://www.mendeley.com/catalogue/840d59c3-7d24-3d41-bdd2-edfc734f608d/
U2 - 10.1016/j.jprocont.2023.103027
DO - 10.1016/j.jprocont.2023.103027
M3 - Article
SN - 0959-1524
VL - 129
JO - Journal of Process Control
JF - Journal of Process Control
M1 - 103027
ER -