Abstract: Based on the assumption of orthogonal cutting, cutter geometry, and the strict model of the cutting load, a model of milling force is developed with the effects of eccentricity of cutter. Through a Fourier transform, the expression of milling force in frequency domain is obtained. By comparing the harmonic component of simulation results with the harmonic component of measurement results, the multi-function of residual harmonics are obtained by using matrix calculation in frequency domain. Then, a method based on multi-objective optimization in frequency domain is improved for the cutting force coefficients and eccentricity of tool identification. Experimental studies are also carried out to verify the accuracy of the cutting force coefficients and eccentricity of tool obtained by the proposed method. Results indicate the error of predicted results obtained by the proposed method is in the range of 2% to 6%. The efficiency and accuracy of the proposed method are also verified by comparing with the results presented in reference, especially for the milling processes with large cutter eccentricity ratio.

Key words: Eccentricity of tool, Milling force, Milling force coefficients, Multi-objective optimization, Orthogonal cutting