Preparation method for carbon fiber composite material product with complex inner cavity

Abstract

The invention discloses a preparation method for a carbon fiber composite material product with a complex inner cavity. A core mold adopted by the method can be softened if being heated to a certain temperature, so that the mold is released conveniently, and the softening temperature is far lower than the glass-transition temperature of the carbon fiber composite material. The core mold is of a hollow structure. The shape of a carbon fiber product in a curing forming stage is kept unchanged by way of inner pressurizing mode and the like. The taken out softened core mold is conveniently reshaped, that is, the same mold core can be cyclically used, so that the cost is lowered. According to the core mold, the shape of which can be reshaped, a production flow of the carbon fiber composite material product can be simplified extremely, the production cost and the production working hours of the carbon fiber composite material product are reduced to a great extent, and products, the shapes ofinner cavities of which are complex, are produced and manufactured in batches.

Description

technical field [0001] The invention relates to the field of manufacturing carbon fiber composite materials, in particular to a method for preparing a carbon fiber composite product with a complex inner cavity. Background technique [0002] Carbon fiber composite materials will be more and more widely used in the future. With the extensive use of carbon fiber, the shape and size of composite products are becoming more and more complex. However, the production of composite materials belongs to additive manufacturing, and the mechanical processing of carbon fiber composite materials is much more difficult than traditional metal products. At present, the manufacture of carbon fiber composite products relies heavily on tooling and moulds, regardless of the manufacturing method. [0003] However, when manufacturing hollow products with inner cavities, especially when the outer dimensions of the inner cavities are extremely complex, traditional tooling molds will encounter the p...

AI Technical Summary

Problems solved by technology

It is a one-time mould. As many molds as there are products to be produced, the cost and man-hours are not low. After the carbon fiber product is molded and solidified, due to the limitation of its glass transition temperature, it cannot be heated to a very high temperature to make the core mold The other type is water-soluble mandrel, that is, the mandrel material is dehydrated and solidified, and melts when exposed to water. The material of this type of mandrel is mainly gypsum. Like the hot-melt mandrel, this type of mandrel is also disposable. The mold needs to be remade every time it is produced, and the interior needs complex frame support. The structure of the whole mold is relatively complicated, and it needs to rely on the internal frame to ensure the size of the external plaster mold. The assembly of the frame is difficult, and it is extremely difficult to apply to long-term The manufacture of products with a relatively large diameter; another method is to use a combined mold, and the core mold itself is assembled from multiple metal molds. When demolding, the mold is removed one by one. The mold is extremely complicated and expensive, and the accuracy of the mold itself is difficult to guarantee.