Mandrel-free autoclave integral molding method for U-shaped unit stiffened wallboards

Abstract

The invention belongs to the technical field of composite molding and relates to a mandrel-free autoclave integral molding method for U-shaped unit stiffened wallboards. According to the mandrel-free autoclave integral molding method for U-shaped unit stiffened wallboards, designed by the invention, a mandrel-free molding method is adopted to meet the requirements of part inner molding quality and vertical rib perpendicularity; and at the same time, the temperature field evenness of dies is improved, multi-die autoclave feeding is realized, and production cost is reduced. A molding device in a molding technology is on the outer side of a vacuum bag, so that the profile precision requirement is not high. U-shaped unit laying dies are only used as laying dies and are not fed into the autoclave with parts, so that the precision requirement is relatively lower. Besides, a pressurization heating process is not carried out, dies are not placed on the parts, fit clearances are not available, pressure is directly applied on the parts, and the inner quality of the parts is great. Compared with a traditional method, the method has the advantages that the molding technology is simple, the manufacture cycle is short, the heat conductivity is great, the temperature rise evenness of the parts is great, and the solidifying of a plurality of components in the large autoclave at a time can be ensured.

Description

technical field [0001] The invention belongs to the technical field of composite material forming, and relates to a method for integral forming of a U-shaped unit reinforced wall plate autoclave without a core mold. Background technique [0002] Advanced composite material is a new material that emerged in the 1960s, and it has shown strong vitality once it came out. At present, advanced composite materials have been widely used in aerospace structures, and have become the four major structural materials of aerospace together with aluminum alloys, titanium alloys, and alloy steels. The position and amount of advanced composite materials used in aircraft have become one of the important indicators to measure the advancement of aircraft structure. [0003] The traditional methods of forming reinforced wall panels are relatively mature, including A (cooperative molding of hard mold and hard mold) and B (cooperative molding of hard mold 10 and soft mold 11). The width is relat...

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Problems solved by technology

[0003] The traditional methods of forming reinforced wall panels are relatively mature, including A (cooperative molding of hard mold and hard mold) and B (cooperative molding of hard mold 10 and soft mold 11). The width is relatively wide. If the traditional method is used to prepare the U-shaped unit reinforced panel, it will bring many difficulties in manufacturing. If the hard mold and the hard mold are used to form (such as figure 1 shown), then

[0004] 1. The U-shaped unit has a relatively large width and fully covers the skin surface. If there is a perfect fit, there will be a fit gap, which will cause uneven pressure transmission and easily cause internal quality defects;

[0005] 2. Put too many molds in the vacuum bag, resulting in uneven heat transfer, poor uniformity of the temperature field, and the inability to realize multiple molds into the tank;

[0006] 3. There are precision problems in mold rev

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