Electromagnetic auxiliary roll bending forming method and forming device thereof

Abstract

The electromagnetic auxiliary roll bending forming method comprises the following steps that an elastic roller is used for pressing a plate to be bent and deformed, and the plate with an inner arc face and an outer arc face is formed; the downward pressing position of the elastic roller is kept, and periodic electromagnetic pulse discharging is conducted on the plate on the outer cambered surface of the plate; during discharge amplification, the plate is reversely bent and deformed under electromagnetic loading, and meanwhile, the elastic surface of the compression elastic roller is deformed; during discharge attenuation, the elastic surface of the elastic roller recovers deformation and forces the plate to reset; and the plate is driven to continuously move in the roll bending direction, and meanwhile periodic electromagnetic pulse discharging is continuously conducted till the continuous roll bending arc length of the plate is larger than or equal to the forming target arc length. Local reverse bending and local bending are periodically and alternately carried out on the plate, the plastic forming performance of the plate can be improved, rebound of the plate after roll bending is restrained, and the surface quality and forming precision of the formed small-curvature thin-wall bent part are improved.

Description

technical field [0001] The invention relates to the technical field of bending and forming of thin-walled plates, in particular to an electromagnetic-assisted roll-bending forming method and a forming device thereof. Background technique [0002] Thin-walled curved parts are the preferred structure for the aerodynamic shape of aerospace equipment, and their forming quality directly affects the flight safety and service life of aviation and aerospace equipment. Stretch forming (drawing) and roll forming are the most important forming methods for thin-walled curved shells. Compared with the sheet drawing process, the rolling forming process reduces the scratches on the surface of the sheet by the die, and the surface quality of the formed parts is good, which is beneficial to improve the fatigue life of the curved shell, and is widely used in single-curvature curved shells. Forming of parts. [0003] In the process of rolling deformation of small curvature (large radius of c...

AI Technical Summary

Problems solved by technology

This scheme adopts the method of roll bending preforming first and then electromagnetic assisted forming, which can trim the position where the forming accuracy cannot reach after roll bending. However, it is essentially a supplement to the electromagnetic forming method alone. The purpose is to adopt The rolling group preforms the sheet material, which greatly reduces the distance between the formed sheet material and the forming die, and greatly reduces the discharge energy of subsequent equipment

Therefore, this solution does not solve the springback problem of small curvature (large radius of curvature)

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