Rubber forming convex flange multi-step forming mold and design method of forming surface

Abstract

The invention discloses a multi-step forming mould for a rubber-forming bent side and a forming surface design method of the mould. The multi-step forming mould for the rubber-forming bent side comprises a plurality of mould bodies, wherein the number of the mould bodies is corresponding to the number of forming steps of the bent side; each mould comprises a mould tyre, wherein a top side is formed on the top of each mould tyre; a bottom side is formed on the bottom of each mould tyre; each mould tyre is provided with a forming surface, wherein each forming surface is connected with the corresponding top side in a circular-arc transition manner; and the forming surface of each mould tyre is adaptive to each forming status of the bent side. The multi-step forming mould for the rubber-forming bent side disclosed by the invention is used for forming bent-side board sheet metal parts and can be used for controlling wrinkles. Moreover, the mould structure can be used for realizing precise forming without affecting the assemblingor reducing the strength and rigidity.

Description

technical field [0001] The invention belongs to the technical field of sheet metal rubber forming mold manufacturing, in particular to a mold suitable for controlling the wrinkling of convex and bent edges of aircraft aluminum alloy plates and a design method for the molding surface of the mold. Background technique [0002] Rubber forming is a common forming method for aircraft sheet metal parts. At present, known rubber molding die structure is made up of tire and cover plate. Put the sheet on the tire, press and position it with the cover plate, and then put it into the rubber molding press for molding operation. However, due to the complexity of aircraft sheet metal parts, there are many parts with convex flange structure, which are prone to wrinkling during forming (refer to the literature: Chen Lei et al., Rubber hydraulic convex flange forming test and analysis research, forging technology , 2007, 32(6): 58-60), resulting in the inability of the parts to adhere to t...

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Problems solved by technology

However, due to the complexity of aircraft sheet metal parts, there are many parts with convex flange structure, which are prone to wrinkling during forming (refer to the literature: Chen Lei et al., Rubber hydraulic convex flange forming test and analysis research, forging technology , 2007, 32(6): 58-60), resulting in the inability of the parts to adhere to the surface of other parts after molding, which caused great difficulties in the assembly process

[0003] At present, there are two methods to control wrinkling for such parts. One is to modify the design, reduce the height or length of the convex flange, and reduce the limit of wrinkling. However, this method will reduce the stiffness and strength of the part at the same time, requiring a series of It is more difficult to modify and reinforce

Another method is to use the side pressing block method to change the molding mode of the part. However, this method needs to artificially increase the height of the convex flange, wasting materials, and because the gap between the side pressing block and the molded tire is small, the rubber in rubber molding It is difficult to press in, the actual operation is difficult, and after forming, it needs to be sheared to cut off the multi-purpose materials. The labor intensity is high, and it will cause secondary deformation of the parts

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