Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
The vibration influence over CBN tool life in hardened boring operations using tool overhangs
Submission Author:
Wallyson Thomas Alves da Silva , SP
Co-Authors:
Anselmo Diniz, Daniel Suyama, Wallyson Thomas Alves da Silva
Presenter: Wallyson Thomas Alves da Silva
doi://10.26678/ABCM.COBEM2017.COB17-2501
Abstract
Turning operations, especially those performed in deep holes, are associated with significant problems related to chatter, which have considerable influence over some productivity factors, production costs, etc. In pre-roughing operations, the drill marks leave great irregularities on the part’s surface. Those cause chatter during the internal turning process, especially during finishing operations, which are used to obtain internal diameters of better accuracy. The vibration is even more accentuated in the machining of hard materials, that requires more intense cutting forces and reach higher cutting temperatures. In such cases, the use of CBN tools is necessary to improve the performance during the machining operation. This work aims to verify the influence of vibration over tool life. To that end, the tests consisted in collecting acceleration signals determined from the Fast Fourier Transform (FFT) and monitoring the tool wear process using optical microscopy, so that the lifespan of the tool could be verified. The tool overhang was varied until it reached a limit (the deepest hole it could machine). The results show that, when the tool overhang is within its stability range, the tool vibration amplitude is greater in the beginning of tool life than in its end, and the surface roughness of the machined part is not affected. Also, the flank wear of the tool is accentuated when the tool overhang outreaches its stability limit.
Keywords
Vibration, machining operation, tool wear
