Numerical simulation method of flexible rolling and forming process of curved-surface part

Abstract

The invention discloses a numerical simulation method of a flexible rolling and forming process of a curved-surface part. The numerical simulation method comprises the following steps: acquiring material attribute parameters of a roller and a sheet material; determining geometric parameters of the roller, the sheet material and a control unit; establishing a geometric model of the roller, the sheet material and the control unit by utilizing a three-dimensional drawing software; acquiring technological parameters of flexible rolling and forming of the curved-surface part; establishing a finite-element analysis model; carrying out simulation analysis of the rolling and forming of the curved-surface part; identifying the accuracy of the finite-element analysis model. According to the method disclosed by the invention, the roller is set to be an elastic body, and elastic deformation of the roller and elastic-plastic deformation of the sheet material are coupled; the control unit is additionally arranged and is used for controlling a roller type of the roller; movement coupling constraint is arranged on the end face of the roller so that the roller rotates around the bent axis of the roller. The numerical simulation method disclosed by the invention reflects a real structure of a forming device and the rolling and forming process of the curved-surface part can be accurately simulated; the numerical simulation method has relatively high precision and efficiency, and evidences can be provided for designing and optimizing a flexible rolling and forming technology of the curved-surface part.

Description

technical field [0001] The invention relates to the field of computer-aided engineering, in particular to a numerical simulation method for the flexible rolling forming process of curved surface parts based on bending rolls. Background technique [0002] Three-dimensional curved surface parts are widely used in industries such as aerospace, high-speed trains, ships, and civil buildings. With the rapid development of the economy, the market demand for curved surface parts is increasing. Flexible roll forming of curved surface parts is a flexible processing method for the production of curved surface parts. This method combines multi-point forming technology with traditional rolling technology to achieve high efficiency and continuity in the forming process of curved surface parts. Compared with the traditional mold stamping forming curved surface parts, this method uses two flexible and bendable rolls as the forming tool, which has a simple and reliable structure; the roll ga...

AI Technical Summary

Problems solved by technology

Although this simulation method can approximate the rolling forming process of curved surface parts, the modeling method of replacing continuous curved rolls with discrete straight rolls changes the original continuous contact state between the rolls and the sheet metal, and the surface quality of the formed parts obtained is poor.

Although increasing the degree of discretization of the rolls will improve the surface quality of the formed parts to a certain extent, the actual simulation effect is still not ideal, especially when the rolls have a large degree of bending, the gap between adjacent straight rolls will affect the three-dimensional curved surface. Forming, which can cause shape defects in severe cases

Moreover, increasing the discretization degree of the roll will increase the difficulty of modeling, increase the amount of calculation, significantly prolong the simulation analysis time, and reduce the analysis efficiency

In addition, this method ignores the effect of the control unit in the forming device on the roll in the actual rolling process, and does not consider the influence of the elastic deformation of the roll on the sheet metal forming, and its simulation accuracy is poor

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