Incremental forming bending method for double-curved-surface metal plate

Abstract

The invention discloses an incremental forming bending method for a double-curved-surface metal plate. The method comprises the following steps: establishing a target three-dimensional digital model according to an expected shape; decomposing the matrix into a plurality of rectangular units; solving a strain minimum energy loading track of each unit according to a minimum energy principle under a constraint condition based on Gaussian curvature so as to obtain a target loading position of a pressure head and a design arrangement position of a support system; the pressing head is driven to load forming force at the position corresponding to the target loading position, and the supporting system is arranged at the position corresponding to the design arrangement position; after the forming force is loaded, the real-time shape of the formed workpiece is detected, point cloud data of the real-time shape is obtained, and an actual three-dimensional digital model is constructed; and comparing the difference value between the actual three-dimensional digital model and the target three-dimensional digital model, and if the difference value exceeds the tolerance range, repeatedly driving the pressure head to load the forming force. By adopting the method, the working efficiency and the forming precision of the incremental forming bending process of the double-curved-surface metal plate can be improved.

Description

technical field [0001] The invention relates to the technical field of forming metal sheets, in particular to a progressive forming and bending method for hyperboloid metal sheets. Background technique [0002] The forming of hyperboloid sheet metal has always been a technical difficulty in the shipbuilding industry, automobile industry, and aerospace industry, especially the processing of hyperboloid sheet metal using incremental forming technology. Incremental forming technology relies on the accumulation of successive deformations to generate overall deformation. For hyperboloids that are curved in both directions, the curved surface of the metal sheet is controlled separately in two different directions (for example, bending in the transverse direction and bending in the longitudinal direction). The cumulative bending is more difficult. [0003] Aiming at this problem, some literatures have proposed progressive forming and bending equipment and methods for curved metal ...

AI Technical Summary

Problems solved by technology

As for the more complex hyperboloid metal sheet, if this method is still used to form the desired hyperboloid shape, it needs to be formed and bent at a large number of forming positions on the metal sheet, so the forming efficiency is low

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