Health assessment and life prediction of cutting tools based on support vector regression

The integrity of machining tools is important to maintain a high level of surface quality. The wear of the tool can lead to poor surface quality of the workpiece and even to damage of the machine. Furthermore, in some applications such as aeronautics and precision engineering, it is preferable to change the tool earlier rather than to loose the workpiece because of its high price compared to the tool’s one. Thus, to maintain a high quality of the manufactured pieces, it is necessary to assess and predict the level of wear of the cutting tool. This can be done by using condition monitoring and prognostics. The aim is then to estimate and predict the amount of wear and calculate the remaining useful life of the cutting tool. This paper presents a method for tool condition assessment and life prediction. The method is based on nonlinear feature reduction and support vector regression. The number of original features extracted from the monitoring signals is first reduced. These features are then used to learn nonlinear regression models to estimate and predict the level of wear. The method is applied on experimental data taken from a set of cuttings and simulation results are given. These results show that the proposed method is suitable for assessing the wear evolution of the cutting tools and predicting their remaining useful life. This information can then be used by the operators to take appropriate maintenance actions. T. Benkedjouh EMP, Laboratoire Mécaniques des Structures (LMS), Bordj El Bahri, Algiers, Algeria K. Medjaher, N. Zerhouni FEMTO-ST, Université de Franche-Comté/CNRS/ENSMM/UTBM Automatic Control and Micro-Mechatronic Systems Department 24, rue Alain Savary, 25000 Besançon, France Tel.: +33 3-81-402796 Fax: +33 3-81-402809 E-mail: [email protected] S. Rechak ENP, Laboratoire Génie Mécanique, El-Harrach, Algiers, Algeria 2 T. Benkedjouh et al.