| Summary: | 碩士 === 國立高雄第一科技大學 === 電機工程研究所碩士班 === 103 === Plastic injection molding machines have gradually developed from the hydraulic type to the all-electric type. Their operations mainly include mold opening/closing, injection/pressure holding, and feed-in backpressure phase. This study mainly focuses on the performance improvement in the feed-in backpressure phase of an all-electric injection molding machine. For in-depth investigation of the features of this phase, this study established a dynamic model of the complete feed-in backpressure process. Meanwhile, the suitability of this model has been verified through comparisons with the actual operation of a real all-electric injection molding machine. Based on this dynamic model, feed-forward control law with feeding rotation speed and backpressure given was established, and the compensator for the backpressure feedback control was designed by frequency response technology as well. Meanwhile, for smoothening the operation the command of feeding rotation speed and backpressure were updated as s-curve. The results were verified through simulation and experimentation.
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