| Summary: | 碩士 === 國立虎尾科技大學 === 創意工程與精密科技研究所 === 98 === This study applied ultrasonic welding technology to inserted work, and developed an ultrasonic-aided inserting machine. This machine uses the shock excitation of ultrasonic transducers to transfer this vibration energy to metal insert through the magnified displacement of sonic welding head. There is violent friction between the metal insert and the thermoplastic material, which would result in high temperature instantly. When the thermoplastic material reaches the thermal deformation temperature, local plastic is in a half-molten state, and applies pressure on the insert and into the thermoplastic material. The molten plastic flows into the texture section on the surface of metal insert and the bottom cut, so as to obtain the effect of ultrasonic inlay.
In addition, the key point of ultrasonic inserted work efficiency is the design of ultrasonic head, and the quality of the sonic welding head influences the processing effect. Therefore, this study used ANSYS finite element analysis software to analyze and design the inserted ultrasonic head. The theoretical welding head in the optimum size was designed and produced based on the tapered ultrasonic head provided by the manufacturer. The ANSYS was used for vibration modal analysis to obtain the natural frequency, and conduct analysis and comparison. Finally, the theoretical welding head was measured by using a frequency instrument. The results showed the measured frequency was 14.8 kHz and close to 15 kHz from ultrasonic generator, which conformed to the simulation analysis value. The efficiency of welding head could be improved.
This machine tested on used plastic materials PVC and ABS for inserted work. The tensile strength of the tested samples was obtained through tensile test, and the optimal process parameter and the relative contribution of processing factors were obtained by using the Taguchi Method
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