Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MONITORING MICRO END MILLING STABILITY VIA ACOUSTIC EMISSION
Submission Author:
Kandice Suane Barros Ribeiro , Turku
Co-Authors:
Kandice Suane Barros Ribeiro, Giuliana Sardi Venter, Reginaldo Coelho, Alessandro Rodrigues
Presenter: Kandice Suane Barros Ribeiro
doi://10.26678/ABCM.COBEM2019.COB2019-0351
Abstract
As micro-milling tools have reduced dimensions, a non-optimized selection of cutting parameters tends to maximize tool wear and breakage throughout cutting operations. Even relatively small errors in placement or changes in the process damping could cause a previously stable cut to become unstable. As the cutting parameters are most likely optimized and, therefore, on the threshold of instability, it is paramount to monitor the machining stability. The monitoring of machining processes provides informative inputs that can be used to control and better select the cutting parameters, improving productivity. This research provides a means to monitor micro end milling stability using acoustic emission (AE) signals in operations of steel COS AR60. Cutting tests were performed by carbide micro end mill tools with (Ti, Al, Cr)N coating, two flutes and 1 mm diameter in a CNC machining centre Romi D800 High Performance adapted with a high spindle speed head, performing sloth cutting. AE signals were acquired at the rate of 1.25 MHz in LabVIEW and processed in both LabVIEW and MATLAB. Images from the micro-channel surface obtained from a 3D laser microscopy were also analyzed. As a result, AE signals have shown an expressive rise when performing unstable cutting and it was possible to determine the chatter frequency. A dynamic analysis was carried out to evaluate the system’s natural frequencies. The method of acoustic emission monitoring has been proved capable of recognizing cutting instability in micro end milling operations.
Keywords
Micro end milling, cutting stability, Machining monitoring, acoustic emission
