Method for designing forming dies for low-double-curvature sheet metal parts

Abstract

The invention relates to a method for designing forming dies for low-double-curvature sheet metal parts. The method includes steps of 1), initially designing four-piece integrated forming die profiles; 2), preliminarily simulating deep drawing forming technologies; 3), judging the rationality of die design technologies; 4), simulating deep drawing forming and spring-back technologies in detail; 5), computing and outputting spring-back compensation on the die profiles; 6), performing solid modeling on the dies in three-dimensional design software. The method has the advantages that all the four-piece double-curvature parts can be formed at one step by the aid of a deep drawing forming process, accordingly, the forming efficiency can be improved, the parts are low in spring-back rate, and the quality of the parts can be guaranteed.

Description

technical field [0001] The invention relates to a method for designing a forming die of a small hyperbolic sheet metal part, belonging to the field of plastic forming of sheet metal. Background technique [0002] The single piece of sheet metal has a very small hyperbolic curvature, and there are four parts with similar shapes in a circle on a single aircraft, which belong to the same hyperbolic curved surface with slightly larger curvature in terms of assembly relationship. The current process of the parts is the method of combining rubber bag hydroforming with manual knocking and correction. The rubber bag hydroforming refers to the use of hydraulic rubber bags as a common punch (or die), and the metal plate The material is processed and formed according to the rigid punch (or die). During the forming process, the rubber bag is not only the pressure transmission medium, but also plays the role of the half mold, which belongs to flexible forming. However, the part has the f...

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Problems solved by technology

[0003] 1. The positioning of the blank is difficult, the sheet is easy to move when the rubber bag is pressed down, the geometric shape is difficult to guarantee, and the scrap rate is high;

[0004] 2. Because the double curvature is too small, the material undergoes elastic deformation and just enters the plastic deformation stage to produce minimal deformation, the pressure of the rubber bag is unloaded, and then the sheet material has a serious rebound, and the rebound of each part is uneven and irregular;

[0005] 3. After forming, each part needs to be manually corrected from shape to mold, the workload of manual operation is huge, the surface quality of parts is poor, and the production efficiency is low

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