INFLUENCE OF ULTRASONIC VIBRATION ON MICROFORMING

Abstract

The influence of ultrasonic vibration on microextrusion of aluminum billets was investigated using a microforming tooling with the capacity to induce vibration at a frequency of 20 kHz. It was found that microforming load can be reduced by 23%, with substantial improvement in the surface quality of the formed part. The percentage load reduction and surface improvement were found to be dependent on the type of extrusion process and the lubricant compositions. The processes investigated in this study were forward extrusion (FE), forwardbackward extrusion (FBCE), and double cup extrusion( DCE).