Based on the instantaneous milling thickness of unequal pitch end milling cutter milling force solution and simulation research

The unequal pitch end milling cutter can change the feed per tooth and the cut-in and cut-out period of each cutter tooth by changing the distribution of the pitch of the end milling cutter so that the energy in the milling frequency domain is dispersed to achieve the purpose of reducing the milling vibration. Because the amplitude of vibration in the milling process is closely related to the milling force, this paper establishes the instantaneous static milling thickness model based on the real trajectory of the milling edge according to the milling process of the end milling cutter with unequal pitch and establishes the instantaneous dynamic milling thickness model based on the regeneration effect, on which the instantaneous milling force model is established. At the same time, the relationship model of milling force coefficient is established according to the average milling force method. From the relationship model of milling force coefficient, the linear relationship between average milling force and average feed per tooth is obtained. Then, the finite element simulation method is used to simulate the actual milling process of milling typical material Al7075-T6 with unequal pitch end mill, and the milling force coefficient is fitted by the simulation results. Finally, the accuracy of the milling force model and the finite element model has been validated through experiments, and the feasibility of calibrating the milling force coefficients through finite element simulation method has been demonstrated. The milling force model of unequal pitch end mill and the method of calibrating the milling force coefficient by finite element simulation proposed in this paper will provide a theoretical basis for the study of unequal pitch end mill in vibration reduction.