Stability domain prediction method for milling large weak-rigidity thin-wall special-shaped component

The invention relates to the field of advanced manufacturing, in particular to a stability domain prediction method for milling of a large weak-rigidity thin-wall special-shaped component. A cutter tooth period is divided into a free vibration section and a forced vibration section, and then the forced vibration section is equally divided into a plurality of discrete intervals by using a Lagrange and Hermite numerical integration method so as to obtain a transfer matrix of a milling system; and finally, a characteristic value of a transfer matrix of the milling system is judged by a Floquet theory to obtain a stability lobe graph of the dynamic milling system of the large weak-rigidity thin-wall special-shaped component. Meanwhile, in the process of obtaining the stability lobe graph, a fine integration method is introduced to calculate the index matrix instead of directly calculating the index matrix, matrix inversion in the index matrix calculation process is reduced, and the defect that a traditional numer