Abstract: The cutting force can be calculated by cutting forces model,and it is the basis of predicting cutting state and optimizing machining parameters.The traditional cutting force model is based on the workpiece coordinate system.However,the way the cutting force expressed in tool coordinate system is more intuitive and effective when the research is machining deformation and vibration of thin-walled part or tool wear in multi-axis machining.On the basis of the traditional mechanical cutting force prediction model,the cutting force model of the tool coordinate system was proposed to predict the cutting force in tool coordinate system,and the cutting force coefficients calibration method based on tool coordinate system was proposed.Finally,the method of cutting force prediction model and cutting force coefficients prediction method are verified by experiments.The results show that the cutting force model proposed can accurately predict the cutting force in actual machining.

Key words: multi-axis machining, tool coordinate system, cutting force model, cutting force coefficients