Cavity pressure dynamics and self-tuning control for filling and packing phases of thermoplastics injection molding

Autor:	Musa R. Kamal, Furong Gao, W. I. Patterson
Rok vydání:	1996
Předmět:	Engineering drawing Materials science Polymers and Plastics Cost effectiveness Dynamics (mechanics) Self-tuning General Chemistry Molding (process) medicine.disease_cause Nonlinear system Control system Phase (matter) Mold Materials Chemistry medicine Composite material
Zdroj:	Polymer Engineering & Science. 36:1272-1285
ISSN:	1548-2634 0032-3888
DOI:	10.1002/pen.10521
Popis:	Because of its versatility, cost effectiveness, and ability to produce intricate shapes to tight specifications, the injection molding process is widely used in plastics processing. Mold cavity pressure plays an important role in determining the quality of the molded articles. The dynamic behavior and control of cavity pressure were studied for the filling and packing phases. The dynamics of cavity pressure during filling were investigated and found to be both nonlinear and time-varying in relation to the hydraulic servo-valve opening, which is the manipulated variable. A self-tuning control system was designed and tested for a wide range of conditions. The transition from filling to packing was best detected by the change in the derivative of cavity pressure. The dynamics of cavity pressure during packing were studied and modeled similarly as for filling. The self-tuning technique was successfully extended and implemented in the packing phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7f3c76da3cb8185ce73f610b226d103 https://doi.org/10.1002/pen.10521 Zobrazit plný text záznamu Plný text