Development of the a tool post to be used in ultraprecision machining

Author(s)

Carlos Umberto Burato

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
• Defense date: 2006-03-08

Examining board members

Jaime Gilberto Duduch; Glauco Augusto de Paula Caurin; Carlos Alberto Fortulan; Marcelo de Assumpção Pereira da Silva; Paulo Alberto Silveira Wrege

• Advisor: Jaime Gilberto Duduch

Abstract

This work deals with the development of a tool post (PFT) for the micropositioning of a tool during ultraprecision machining in the nanometric range. Micropositioning employing piezoelectric actuators is defined. Precision engineering designs aspects applied to the development of the PFT are discussed. Control techniques such as PID and phase-lag compensator are addressed. A computer simulation for the verification of the vibrating modes of the PFT, with the simultaneous identification of the natural frequencies is carried out. An ideal model - all components will be manufactured and assembled - is presented. A control strategy based on the processing of signals acquired during the micropositioning of the tool to identify the positioning condition and to obtain information to be used by a PID controller is proposed. Experimental tests are performed with displacement of the tool, up to 25 &#956m, with frequency, up to 10 Hz. (AU)