Large-curvature three-dimensional hook face multi-step forming method based on gradually-changed mold molded face

Abstract

The invention provides a large-curvature three-dimensional hook face multi-step forming method based on a gradually-changed mold molded face, and belongs to the field of metal plastic working. Large-curvature three-dimensional hook face parts are difficult to form, and various forming defects, in particular to the corrugation defect, are extremely prone to occurrence in the forming process; and in a traditional drawing forming method, even though large-curvature hook faces can be machined, complex blank pressing molds are needed, and the method is suitable for thin-plate forming and cannot be used for forming medium and thick plate hook face parts. The method is based on a mold with the adjustable dispersed type molded face, the mold molded surface is adjusted step by step to conduct multi-step forming, and the shapes of the hook face formed in all forming steps are gradually changed, so that the deformation amount of plates in all forming steps is smaller, and the corrugation defect is avoided; and after multi-step oppositely-pressed forming is carried out on the plates, the large-curvature three-dimensional hook face parts are obtained. The method is suitable for forming the medium and thick plate hook face parts and also suitable for forming the thin-plate hook face parts.

Description

technical field [0001] The invention belongs to the field of metal plastic processing, and relates to a sheet material forming method, in particular to a multi-step forming method of a large-curvature three-dimensional curved surface based on a gradually changing mold surface, which is suitable for the counter-press forming of large-curvature three-dimensional curved surface parts. Background technique [0002] In the manufacturing fields of aircraft, ships, high-speed trains, chemical containers, etc., as well as in modern architectural structures and urban sculptures, there is an increasing demand for three-dimensional curved surface parts with large curvature. It is difficult to form large-curvature three-dimensional curved surface parts, and various forming defects, especially wrinkling defects, are prone to occur during the forming process. Although the traditional drawing forming method can process large-curvature surfaces, it requires complex blank-holding dies, and t...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of large-curvature surface parts, especially medium-thick plate large-curvature surface parts, which are difficult to form and prone to wrinkle defects during the forming process, the present invention will provide a multi-step counter-press forming method using discrete molds, based on discrete Adjustability of the mold surface, gradually adjust the mold surface, so that the curvature of the formed surface gradually increases with the increase in the number of forming steps, to ensure that the deformation of the sheet metal in each forming step is small, thereby avoiding The generation of wrinkling defects, through the accumulation of small deformations in each forming step, finally obtains a three-dimensional curved surface part with large curvature

Images