PERFORMANCE EVALUATION OF A MICRO-MILLING SETUP – VALUTAZIONE DELLE PRESTAZIONI DI UNA MACCHINA PER MICROFRESATURA

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This report belongs to the research project ‘Reliable micro-milling of dies and moulds’ of Delft University of Technology, NL, which regards the development of a reliable process of micro-milling for the industrial production of dies and moulds for injection moulding. The thesis-work has been made abroad in The Netherlands. Purpose of the work was to develop a performance evaluation method suitable for the micro-milling machine present at the university. The first step of the work was to draft, over the literature survey, the error budget for the micro-milling machine. Then it has been developed the analysis of three performances: the static stiffness of the machine components, the dynamic accuracy and the geometric accuracy. For each of them an experimental setup has been designed and some tests have been carried out. As regards the static stiffness analysis, an investigation of the stiffness of each component of the machine has been done, modelling them in a compliance chain. In the analysis of the dynamic accuracy some tests on the behaviour of the machine under high acceleration magnitude have been done: it has been observed the following error

4 INTRODUCTION OF THE INSTRUMENTS