A study on the SystematicalUltrasonic-Assisted Molded Parts Releaseof Mold Forming

Autor: Yu-Chieh Shen, 沈煜傑
Rok vydání: 2009
Druh dokumentu: 學位論文 ; thesis
Popis: 97
According to the need of energy-saving concept for plastics injection molding, a systematically analytical methodology simulating the molded-part release by means of ultrasound-aided wave transmission instead of the traditional eject-pin mechanism is successfully implement in this study. The acceptable mode shape, the natural frequency of the ultrasonic device, and the operating frequency are correlated attributed to the preliminary modal analysis. Meanwhile, a novel wave-guided block for enhancing the response sensitivity of the ultrasonic transmission is also proposed in this study. The wave-guided block can be used as the modification of the incident-wave angle and/or the amendment of the concentration of ultrasound beam. For fast and easily releasing the molded part, uniform displacements in some critical points of the molding die are needed. Thereby, the molding die, the ultrasonic transmission device, and the incident ultrasound must be carefully and suitable design and analyzed. In which different incident positions of the ultrasonic horn correlated to the mold die mechanism, different incident angles of ultrasonic waves, and the geometry of wave-guide are studied and design. Accordingly, the acceptable or optimal harmonic (or harmonic) frequency of the mold-die device related to the acceptable or optimum mode shape, the distance of the relative position between the mass center of the mold die and the geometric-shape center of the ultrasound transmission horn, and the most acceptable or favorable incident angle of ultrasonic waves are found under the consideration with and without the wave-guided block. Consequently, as using the wave-guide block joined to the device of the mold die, the uniformity of displacement at critical points are relatively enhanced.
Databáze: Networked Digital Library of Theses & Dissertations
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