Abstract: This paper presented an ultrasonic microinjection molding machine with the ultrasonically driven technology for polymer plasticization and injection.Firstly, the structure and working principle of the ultrasonic microinjection molding machine were introduced.Then the structure of the ultrasonic plasticization and injection unit and the ultrasonic vibration module were designed. Finally, modal analysis and static analysis of the ultrasonic vibration module were conducted using ANSYS software, the resonance frequency and the corresponding longitudinal vibration model as well as the stress and strain distribution of ultrasonic vibration module were obtained. The ultrasonic vibration of ultrasonic micro injection modules could provide longitudinal vibration to meet the needs of the material performance requirements.

Key words: ultrasonic micro-injection molding machine, ultrasonic vibration module, modal analysis, static analysis