Method for compensating rebounding error of automobile cover panel based on numerical simulation

The invention discloses a method for compensating a rebounding error of an automobile cover panel based on numerical simulation. The method comprises the following steps of: constructing an ideal model of a stamping part in a computer, acquiring a finite element model of an original stamping die on the basis of the ideal model of the stamping part by a numerical simulation technology, and performing small-equidistance offsetting on the finite element model of the original stamping die to acquire the finite element model of a new die; stamping and forming the two dies and simulating the rebounding by the numerical simulation technology, and exporting grid data for rebounding analysis; and performing discrete Fourier transform on the grid data of the stamping part, which does not rebound, of the two dies, and the grid data of the stamping part, which rebounds, of the two dies respectively, and calculating a die molded surface which is subjected to compensation and correction by using a frequency domain transfer function concept of a linear system to acquire a computer-aided design (CAD) molded surface of the ideal die corresponding to an ideal stamping part. By performing numerical simulation of rebounding compensation on the die molded surface, a correction die size which can eliminate a geometric error caused by the rebounding of a workpiece can be obtained to ensure that the stamping part with high shape accuracy is obtained.