The main molding technology of carbon fiber for sports equipment

Carbon fiber composite material is an inorganic high-performance fiber with a carbon content of more than 90%. It is a new material with excellent mechanical properties. It can be integrally formed through reasonable design, which can save a lot of combined frames and assembly frames and reduce production costs. . There are many molding methods for sports equipment, mainly including winding molding, compression molding, RTM molding, pultrusion molding and other technologies.

Winding technology

On a special winding machine, the prepreg is evenly and regularly wound on a rotating mandrel, and finally the mandrel is cured and removed to obtain a product. The winding molding method is suitable for the manufacture of simple rotating bodies, such as cylinders, spheres and certain positive curvature rotating bodies or cylindrical products, and can also be used for the manufacture of non-rotating body parts.

Its distinctive feature is that the fibers can be arranged according to a certain rule according to the force of the product, so as to give full play to the strength of the fiber and obtain lightweight and high-strength products; in terms of technology, it can realize continuous and mechanized production, and the production cycle is short, and the production High efficiency and low labor intensity; the disadvantage is that the core mold needs to be removed after the product is cured, which is not suitable for the manufacture of products with concave curved surfaces. Golf clubs and fishing rods can be made in this way.

Compression molding technology

The compression molding process is a method in which a composite article is cured by heat and pressure in a closed mold cavity. The molded mold is composed of two parts: a negative and a positive mold, and the reinforcing materials are generally chopped fiber mat, continuous fiber mat and fabric. The compression molding method has high production efficiency, accurate product size and smooth surface, and is especially suitable for manufacturing large quantities of products with high precision and repeatability requirements.

Products with complex structures can be formed at one time without the need for auxiliary processing (such as turning, milling, planing, grinding, drilling, etc.) that damage the performance of the product, and the appearance and size of the product are repeatable. The disadvantages are: the mold design and manufacture are complex, the initial investment is high, and it is easily limited by equipment.

RTM molding technology

RTM (Resin Transfer Molding, RTM for short) is a commonly used molding technology for composite materials. The technology is to lay fibers or preforms into a closed mold cavity, inject resin liquid into the mold cavity with pressure, infiltrate the fibers or preforms, and then solidify and release the molded products.

The advantages of RTM technology are: the ability to manufacture complex composite components with high quality, high precision, low porosity, and high fiber content, and smooth double surfaces can be obtained without gelcoat resins; short product design-to-production time and high production efficiency ; RTM molds and products can be designed with CAD, easy to make molds, and a wide range of material choices;

The components and pipe fittings formed by RTM are easy to achieve local reinforcement or manufacture of locally thickened components, and the composite material with core material can be formed at one time; during the RTM forming process, there is less volatilization, which is conducive to protecting workers and the production environment. RTM technology is currently generally used for mass production of body parts for bicycles and rowing boats.

Pultrusion technology

Pultrusion refers to a method in which fiber bundles or ribbon-like fabrics are dipped, extruded, heated and cured, and cut to length under external force to make linear products with specific cross-sectional shapes and lengths. It passes the impregnated continuous fibers through a forming mold with a certain cross-sectional shape, solidifies and forms in the mold cavity, or gels in the mold cavity, and is heated and solidified in the mold product.

The pultrusion molding process is simple and has high efficiency; when the product is prepared by the pultrusion method, the reinforcing fibers are arranged in parallel along the axial direction, which can effectively utilize its strength; the fiber mat reinforcement material can be used to prepare isotropic products; the use of woven belts can improve the product’s strength. Lateral strength. Pultruded products have the characteristics of high strength, light weight, easy decoration and good surface quality. These properties are ideal for many types of sports equipment and related applications, such as fishing rods, bows, poles, ski poles, and more.

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