Dynamic analysis and parametric control of ultrasonic vibration assistant machining system

• Main Author: Wong, Jun Jie.
• Other Authors: Lin Rongming
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Mechanical engineering::Machine shop and drawings
• Online Access: http://hdl.handle.net/10356/45089
• Institution: Nanyang Technological University

Recently, ultrasonic vibration assisted machining has been looked into to improve conventional machining. However, only a few researches have been done on vibration assisted milling. Therefore, this project is done to investigate the effect of one dimensional ultrasonic vibration assisted milling on the surface quality. Vibration motion is added to the workpiece during the milling process to achieve intermittent cutting. In theory, intermittent cutting can reduce the tool cutting forces, improve the surface finish, and extend the tool life. To verify this, a one dimensional ultrasonic vibration assisted milling system is designed. A modal analysis is first performed on the milling system to obtain its modal characteristics. Milling tests are then conducted with and without vibration assistance in the feed and cross feed direction. Machining conditions such as spindle speed, feed rate, depth of cut, width of cut and tooling configuration are varied in the milling tests. Although no positive results in terms of better surface quality have been obtained, there are some trends observed. In general, low feed rates and low spindle speeds are found to generate better surface quality. Also, ultrasonic vibration assisted milling in the feed direction produced better surface results than the cross feed direction. Some explanations are offered to support these results too.