Turning workpiece chatter avoidance using piezoelectric passive and active damping

• Grant number: 11/17166-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2011
• End date: June 30, 2012
• Field of knowledge: Engineering - Mechanical Engineering - Manufacturing Processes
• Principal Investigator: Maira Martins da Silva
• Grantee: Robison Ricardo Alves
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Regenerative chatter is a major limitation to the productivity and quality of machining operations; therefore, strategies for its suppression should be considered and evaluated during the machine design process. The regeneration of chip thickness, which is related to phase between the modulations left on the surface during the successive cuts, is the most common reason behind the phenomenon of chatter instability. Structural damping has a proportional relationship with stability limit. In this way, in order to increase the stable depth-of-cut, damping can be increased in the system by active or passive means. In this work, the use of piezoelectric shunt damping for passively improving the stability limit and the use of velocity feedback for actively improving the stability limit in turning process is going to be numerically and experimentally investigated. This stability limit enhancement results in more productive machining processes and improved finishing.