Models of machine tool efficiency and specific consumed energy

Experiments were carried out for statistic modelling of machine tool efficiency and of specific consumed energy in machining. The machine tool efficiency, specific consumed energy and consumed energy have been determined as functions of different machining parameters. For establishing the relationship between the above parameters, the experimental data were statistically modelled using the Response Surface Methodology. The experimental data were obtained by measuring the working parameters of machine tool and the power consumed by the electric motor, for every experience of the experimental program. These data were used in estimation of the coefficients of the models and in their statistic analysis. As an example, the models of efficiency for a vertical-milling machine and of specific consumed energy for milling of an aluminium alloy on this vertical-milling machine are described, ones illustrated.