Fast curing method for sandwich structure composite material

Abstract

The invention discloses a fast curing method for a sandwich structure composite material. A heating layer made of metal is attached to the back side of a die, a rubber layer and a heating layer are added in a vacuum bag, a layer of ventilation and heat preservation material is arranged between the vacuum bag and the heating layer, then air in the vacuum bag is pumped away, and a heating element of the heating layer and the rubber layer in the vacuum bag are adhered into a whole. The vacuum bag and the heating element below the die are coated with heat preservation layers, multiple induction heating coil modules arranged evenly are arranged on the outer sides of the two heat preservation layers separately, the diameter sizes of the induction heating coil modules are 100-250mm, and the induction heating coil modules are arranged at the positions distant from the heating layers by 10mm-20mm. Power needed for temperature rise is greatly reduced compared with traditional methods adopting autoclaves, baking ovens and pressing machines, energy consumption is greatly reduced, the temperature rise rate can be effectively promoted, and the process cycle is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of composite material processing, in particular to a method for rapid solidification of sandwich structure composite materials. Background technique [0002] Sandwich structure composite materials are widely used because of their light weight and high rigidity. It is characterized by two layers of skin on both sides and a sandwich material in the middle. The skin material can be metal sheet or non-metal sheet, and the sandwich material can be honeycomb or foam material. The skin and sandwich material are bonded together by adhesive, so that the sandwich structure composite material has light weight, high specific strength and high rigidity. And other advantages, it has become an important structural form in the composite material structure, and has been widely used in various industries. [0003] The process of bonding the skin of the sandwich structure composite material and the sandwich material into a wh...

AI Technical Summary

Problems solved by technology

[0005] It is based on the above reasons that the temperature increase rate of large-scale sandwich structure composite materials is limited by equipment, as well as by product molds and other factors. The molding cycle is long and the production efficiency is relatively low.

Moreover, the construction scale and size of the above-mentioned equipment are limited. It is difficult to construct super-sized autoclaves, ovens, and presses. The construction and use costs are high and the control is difficult. Usually, enterprises cannot afford the construction and use of these super-large equipment.

For this reason, the size of large-scale sandwich structure composite materials is limited by the scale of large-scale equipment owned by enterprises. Usually, large products have to be divided into several pieces and then assembled together, which actually reduces the structural efficiency of large-scale sandwich structure composite materials. Added weight, increased structural weakness, increased manufacturing costs

[0006] For large-scale sandwich structure composites, it is also tried to use self-heating molds. However, the sandwich materials of sandwich structure composites: honeycomb and foam are usually poor conductors of heat, and the skin on the mold surface is quickly heated, but the heat is transferred to non-thermal The process of skinning the mold face is very slow, and sometimes it is difficult to bring it to the temperature required by the curing process

In the existing technical method, it is difficult to realize the heating of the non-mold surface without the equipment such as oven and autoclave

At the same time, the solidification process of sandwich structure composite materials requires that the temperature of both skins must be within a certain range of uniformity, such as within 5°C. Too poor temperature uniformity will cause excessive deformation of the product after cooling, or the deformation cannot be controlled, resulting in Product scrap

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