Research on the Flow Characteristics of Polymer Injection Molding Under Ultrasonic Vibration and Plastics' Mechanical Strength

In this paper, ultrasonic vibration is adopted and exerted on injection molding in order to improve plastics' forming ability, and the impact testing is used to analyze different injection parts' mechanical properties. On the one hand, experiments prove that ultrasonic vibration can increase polymer's melt flow rate, decrease melt viscosity, and improve injection flowing in mould cavity. On the other hand, the mechanical tests prove that the ultrasonic vibration can improve plastics' tensile strength, elastic modulus and other mechanical properties. As a result, a weldless ultrasound-assisted injection molding method is recommended.