Accurate Prediction Method for Energy Consumption in Automatic Tool Changing Process of Computer Numerical Control Lathe

In order to achieve accurate prediction of energy consumption in the automatic tool change process of Computer Numerical Control (CNC) lathe and provide a basic model for energy saving optimization of CNC lathe, an accurate prediction method is proposed for energy consumption in the automatic tool changing process for computer numerical control lathe. The method firstly measures the duration of automatic tool changing under multiple sets of rotary cutters by fitting the measured value. The energy consumption of the basic module of the machine tool is obtained by calculating the measured value which is based on the basic module power of the machine tool and the duration of the automatic tool changing. And the steady state energy consumption of the tool changer is obtained by calculating the measured value. By obtaining the energy consumption caused by all the power peaks in the automatic tool changing process of CNC lathe, the transient state energy consumption of the tool changer is got. The whole energy consumption is consisted of the basic module of the machine tool, the steady state of the tool changer and the transient state of the tool changer. Finally, a case study of energy modelling and analysis for a CK6153i CNC lathe finds that the prediction accuracy is above 95%, which indicates that the research can accurately predict the energy consumption of the CNC lathe in the tool changing process.