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The tool bears the impact load and the alternating force load caused by the sudden change of hardness in the milling process of automobile panel splicing die, which aggravates the milling vibration and reduces the accuracy of die surface. According to the machining characteristics of automobile panel splicing die, the dynamic equation considering the impact of through-seam is established. The state item, the time-delay item and the periodic coefficient item in the state space form of dynamic equation were discretized by multi-order Lagrangian interpolation, and a fourth-order complete discretization method is proposed. Based on the proposed fourth-order complete discretization method, the multi-period milling stability lobe was obtained, and the milling stability lobe band in the splicing region was obtained by combining the maximum and minimum envelope method. The correctness of the dynamic model was verified by the time-frequency domain method such as Fourier transform and milling vibration and milling force data collected from the machining process. The research results can provide theoretical support for the selection and optimization of milling process parameters of splicing die.

Stability analysis of milling process for multi-hardness splicing die