Rail transit construction opens up space for the development of composite materials industry
The use of a large number of FRP products is followed by flame retardancy problems. Since most of the FRP products are made of unsaturated polyester resin, they have poor flame retardancy and high toxicity. In recent years, Japan, France, Germany, Italy and other countries have successfully developed hand-paste and mold-formable phenolic FRP products by modifying phenolic resin and selecting a new curing system, without adding flame retardant. It has high flame retardancy, low smoke generation and low smoke toxicity, and has achieved good application results. For example, Japan National Railways uses hand lay-up phenolic FRP to manufacture wallboard and air conditioning channels, and uses phenol molding to make phenolic products. FRP tea tables, window frames, etc.; Italy ETRY500 high-speed trains use phenolic fiberglass prefabricated sandwich panels to make telephone rooms, storage room ceilings, and doors; some passenger cars in France also use phenolic fiberglass to make tea tables and seats.
Toilets, toilets, toilets, sleepers, luggage racks, air conditioners, air ducts, etc. are all extremely corrosive parts, and are most suitable for making with FRP. The FRP composite overall bathroom, including the roof, wallboard and floor of the bathroom, can be made of FRP composite material, and the bonding connection is a whole. The integral bathroom can reliably protect the connected metal components from corrosion damage. The utility model is made of FRP composite material, which can improve the service life. The structure is made by coating the PVC foam around the elliptical shell made of FRP composite material and applying a layer of FRP composite material on it. Mezzanine structure.
Low cost highlights the advantages of FRP parts for rail transit. With the development of raw materials and advances in technology, the cost of composite materials is gradually decreasing.
Thanks to modular design techniques and integral forming technology, composite materials have greatly reduced the complexity of the structure and reduced the amount of work required for production and final assembly, reducing overall costs. At the same time, the composite material has the characteristics of fatigue resistance and corrosion resistance, which reduces the maintenance and repair cost of the product. As a result of weight reduction, increased operational capacity and reduced energy consumption, the total life cycle cost (LCC) of composites has also been reduced. The low-cost manufacturing technology has a wide range, and a process technology with high molding efficiency, high yield, and wide applicability of raw materials is generally called a low-cost technology. For high-speed rail vehicle products, low-cost manufacturing technology refers to a system in which various molding processes work together. This is mainly due to the manufacture of large and complex high-speed rail vehicle products, usually only using a variety of molding techniques to achieve the desired results (such as weight loss, high performance, etc.), such as Germany AEG and MBB in the development of the bogie Molding, winding, pultrusion, and bonding techniques. Therefore, only by organically integrating various processes and technologies, composite materials are likely to be updated and applied more in the field of high-speed rail transportation.
At present, the composite materials and models used in China's high-speed trains are: "Blue Arrow" EMU and "China Star" high-speed train. The front cover of the "Blue Arrow" locomotive is the front nose end formed by the RTM process, and the hand-shaping process integrally forms the shroud; the front end cover of the "China Star" power car is hand-formed. Some of the auxiliary parts of the above-mentioned high-speed trains also use composite materials, such as the driver's instrument panel, door and window frame, roof cover, battery box, etc., which are still limited to interior decoration parts, seats and hoods.
The application of composite materials on high-speed trains ranges from composite decorative parts to fully composite high-speed trains. Composite materials show great advantages and broad prospects for their application in high-speed rail transportation. In addition to the application of existing technologies and processes, for the development of high-speed rail vehicles, supporting vehicle doors, the overall bathroom and other car body equipment and decorative parts, we should in-depth study of composite materials manufacturing technology and products with independent intellectual property rights, improve composite materials in high-speed track The application level of the field will promote the development of China's high-speed rail transportation industry.
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