5, pultrusion molding process:
The raw materials such as carbon fiber tow, ribbon or cloth, which are impregnated with resin liquid in advance, are formed and solidified through the effect of traction force, and continuous production of carbon fiber profiles with different sizes and lengths is continuously produced. The pultrusion forming process of composite material is a special process in the forming process. Its remarkable characteristic is that it can fully realize the automation of production process, high production efficiency, and possess the capacity of mass production. The fiber mass fraction of pultrusion molding products can reach 75%. The resin soaked liquid is carried out under tension. The strength of the reinforced body is fully played, the strength of the product is high, the transverse and longitudinal strength of the finished product can be adjusted arbitrarily, which can meet the different mechanical requirements of the carbon fiber composite products. This molding process is suitable for the production of various sections of section shapes, such as I-shaped, angular, grooved, heteromorphic section tubes, and the cross section profiles made up of the above section.
6. Liquid forming process:
The liquid forming process is a product forming process that syntheses the liquid monomer into polymer, and then the process of the polymer curing reaction composite is changed into the process that is done directly in the mold at the same time. This process not only reduces the energy loss in the process, but also reduces the production cycle and reduces the production cost (it takes about 2 minutes or so to complete a piece of products). However, the popularization of this technology must be based on the precision of pipeline transportation and material measurement, as well as the automatic control of temperature and pressure. This process belongs to the cross discipline of high polymer materials and modern high science and technology. It is subject to the development of science and technology, and the current field of use is not very wide.
7. Vacuum hot pressing tank process:
This process is a process of placing the composite blank of single prepreg in a preset direction in a hot pressing tank to complete the solidification under certain preset temperature and pressure. The autoclave is a special pressure vessel that can withstand and adjust the temperature and pressure range. The blanks are laid on the surface of the mold of the mold release agent, and then the blanks are completely covered with the mould cloth, the rubber felt and the breathable felt, and sealed in the vacuum bag, and then put into the hot press tank. The key to ensure the quality of the composite is to draw a vacuum before adding the hot pressing tank to the curing process, and then the setting and execution of the curing rules of the hot press tank under high temperature, pressure and solidification are the key to ensure the quality of the composite. This molding process is suitable for manufacturing fairing, aircraft hatch, airborne radome, bracket, wing, tail and other products.
8. Vacuum introduction process:
The vacuum introduction process is called VIP. The carbon fiber composite cloth is laid on the surface of the mold. Then the vacuum bag is wrapped around the vacuum bag and the air in the vacuum bag is extracted. A negative pressure is formed in the vacuum bag and the inside of the mold. The unsaturated resin is pressed into the carbon fiber layer through the pre laid pipeline by the pressure produced in the vacuum pumping process. In the process, the resin is flowing evenly between the carbon fiber cloth, and the whole product layer is filled evenly. After the high temperature products are solidified, the vacuum bag is removed and the required products are obtained after the die separation. The process has patent records since it appeared, but it has been popular in recent years. In the vacuum environment, the resin infiltrates carbon fiber cloth, the bubbles produced in the vacuum bag are less, the strength of the products is higher, the quality is lighter, the quality stability is better, and the use of the resin is reduced. Only a smooth mold can get two smooth products, and the thickness of the product is better controlled. It is generally used in ship’s rudder, radar shield, wind turbine blade, cabin mask, lightweight modification parts, windshield, carriage and engine cover in automobile industry.
9. High temperature molding process:
High temperature oven
The carbon fiber prepreg is laid flat between the upper and lower moulds, the mold is tightly sealed and the mold is placed on the hydraulic molding platform. The resin and prepreg are solidified after a certain time of high temperature and high pressure on the hot press, and the carbon fiber products are removed from the hot press. This molding process has the advantages of high strength, high precision, light quality, small impact on the environment and good for batch. It is suitable for batch and standardized production of parts.
The molding process has been used for many years in foreign countries. The application time in China is short, but the application type is very strong. It has an irreplaceable role in the industrial component. In the process of production, the filling amount of resin can be effectively controlled, and the fiber wettability is good, the content of carbon fiber is high, so it has high strength and high strength. If the environment is good, it can reach the scale production of 5-8 million pieces per year. In the process of processing some structural parts, the high speed rail of our country has used this molding process. After the product is formed, it effectively solves the problem of the difficulty in connecting the carbon fiber to the metal, and effectively ensures the mechanical strength and mechanical requirements of the parts. According to the feedback from the high iron manufacturers, this kind of light is high strength, aging resistance and long service life. Carbon fiber structures have achieved their desired results, and it is inferred from their application that the carbon fiber products using this molding process can also be applied to more products, such as interior decorations, armrest, body accessories, spare parts and so on.
10, 3iTech induction heating process:
This is a new induction heating process which integrates the inductor in the mold. The carbon fiber material can be processed at the temperature of 20 -400 C, and the heat conduction principle is used to heat the mold surface through the temperature sensor. This is by high and new