Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
An analysis of surface roughness in turning/boring under different chatter conditions
Submission Author:
Giuliana Sardi Venter , PR
Co-Authors:
Giuliana Sardi Venter, Maíra Martins da Silva
Presenter: Giuliana Sardi Venter
doi://10.26678/ABCM.COBEM2017.COB17-0203
Abstract
Chatter is a self-excited vibration that leads to large tool vibrations, reduced tool life and overall diminished process productivity. The large vibrations associated with chatter increase the surface roughness of the finished machined piece, which can lead to out of tolerance pieces that need to be reworked. The use of slender tools for internal turning/boring aggravates this issue. Different chatter conditions can happen by a change in the machining parameters, such as varying the applied depth of cut and spindle speed, leading to stable and unstable cuts. This paper showcases an extensive analysis of the surface finishing of pieces machined under several unstable and stable conditions via an experimental analysis. A tree of experiments was developed in order to isolate each experimental variable. Pieces were machined under all designed conditions in a CNC lathe and both data gathered trough a profilometer, as well as visual data were then analyzed. Analytical statistical tools were used to measure the impact each different parameter has in the machined piece surface roughness. The surface roughness not only changes with the use of stable or unstable cutting conditions, but a large variation of roughness can also occur with the variation in the stable cutting conditions. Another important output of this experiment is the analysis of the profile of the machined pieces. The profile changes drastically under chatter and no chatter cutting conditions.
Keywords
turning/boring, Chatter, Roughness, variability study
