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

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of thin plate stamping and forming, in particular to a method for compensating springback errors of automobile cover parts based on numerical simulation. Background technique [0002] Sheet metal stamping is the main forming method of automobile panels. Springback is one of the main defects in the sheet metal stamping forming process, which seriously affects the dimensional accuracy of formed parts, and is a key factor to be considered in stamping die design. [0003] The traditional stamping die design is based on the trial and error method to solve the springback problem. Due to the large differences between different covering parts, the design cycle is long and the cost is high. This method requires the operator to have high skills and rich experience, and the success is accompanied by a certain chance. In recent years, based on the requirements of safety, economy and environmental protection, a large nu...

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Problems solved by technology

In engineering practice, the amount of springback is difficult to obtain. The main problem is that the shape of stamping parts before springback cannot be measured. Even if the shape of the stamping die is used to approximate the replacement, there is also a point-to-point correspondence between the mold surface and the stamping part that cannot be measured. sure problem

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