In order to understand the energy consumption of injection molding machines driven by different types of electro-hydraulic power units, the energy efficiencies of the asynchronous motor, the servo motor and the hydraulic pump under different working conditions are firstly analyzed.
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Injection Molding – Injection molding is a mass-production technique for creating plastic parts using an injection molding machine, thermoplastic pellets, and a mold. The process and melt
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Finally, the energy consumptions of the injection molding machine during a working cycle driven by these five power units are tested and analyzed respectively. The results indicate that the power unit using a fixed displacement pump driven by an asynchronous motor has the largest energy consumption.
Significant energy-saving effect could be achieved by adopting the speed variable power unit. Injection molding machines consume a large amount of energy in the production process, during which the power units are the most significant factor.
China’s IMM industry has become the world’s largest producer and consumer. However, over 90% of the energy costs in injection molding are accounted for by electricity [3,4], so energy consumption remains high. It is estimated that these injection-molding plants in the United States consume around 30 billion kWh of electricity annually [5,6].
After verifying whether the required degree of locking is achieved, the frame is moved forward to bring the nozzle in contact with the mold (i.e., frame forward). Then, the injection cylinder is filled with pressure oil, and the screw rapidly injects the melt into the mold cavity under the high-pressure drive (i.e., the injection).
The thermal control of an injection molding system is a key issue in the development of high-efficiency injection molds. In 2015, Byeong-Ho Jeong, Nam-Hoon Kim, and Kang-Yeon Lee proposed a DSP-based PID control system for thermal control, which achieved high precision, better performance, and good stability at a low cost . 4.2.
Other stages such as mold locking, mold opening, pressure holding and cooling consume low power. The test results reveal that the power remains largely unchanged during the injection stage, which is 17 kW. However, during the plasticization stage, the power is reduced from 13 kW to 5 kW.
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