Study and Determination of the Variables More Influents in the Surface Roughness of Slim Pieces Machined on a Lathe under Self Excitation Chatter Vibration

ABSTRACT The machining of slim pieces is affected by the chatter phenomenon. In this paper a study of the factors that influence the surface roughness of slim pieces fabricated on a lathe under self-excitation chatter vibration is presented. The purpose of the study is to determine which are the variables more influents in the process. For this study a novel analytical model for predicting the chatter phenomenon is used. The model functions according to the operating conditions of the turning process and the properties of the material to be machined. The one degree of freedom model has been achieved by incorporating into the model the relative motion between the cutting tool and the workpiece and by considering the problem of the forces involved as well as the tool geometry. The aim of the study is to determine which of the operating variables, or combination of variables, influences surface roughness through the chatter effect. Feed rate, depth of cut and cutting speed were found to have the greatest influence.