CRRC Sifang expert: Rail transit may bring 50,000 tons of demand for carbon fiber composites every year

Relevant data shows that as of June 2020, 86 domestic railway trunk lines have been opened, with a length of 37,000 kilometers, and 3665 trains operating online.
The operating mileage and the number of trains accounted for 2/3 of the world.
? According to the plan of the National Railway Administration, by 2030, the railway mileage will reach 45,000 kilometers and 7,000 trains will be put into use.
In terms of urban rail, as of the end of 2019, 40 cities in China had opened a total of 208 urban rails, with a mileage of 6,736 kilometers and a total of 6,966 trains.
"It is estimated that a total of 7,800 kilometers will be built by 2025, and the number of trains will exceed 16,000 by then.
This will bring huge market demands for carbon fiber composite materials.
"? In Qingdao Metro Group Co.
, Ltd.
, Smart Rail Transit Industry Observation, China At the "2020 China Smart Rail Transit Industry Summit" co-sponsored by the Rail Transit Professional Committee of the Technology Market Association, the National Advanced Rail Transit Equipment Innovation Center, and the "China Smart Rail Transit Industry Summit" Gao Yulong shared the application of carbon fiber composite materials in rail transit.
? " Gao Yulong? Gao Yulong, director of the Composites Research and Development Department of CRRC Qingdao Sifang Locomotive and Rolling Stock Co.
, Ltd.
, said that there are currently 3,800 high-speed trains in China.
If the utilization rate of carbon fiber and other composite materials reaches 30%, it will generate a demand of 300,000 to 500,000 tons.
If it is extended to areas such as urban rail and freight transport, the demand will exceed 1 million tons.
"If the progress goes well, the use of carbon fiber composite materials in rail transit trains can expect a market scale of 30,000 to 50,000 tons per year.
"? Application experience is becoming more mature? It is understood that since the 1950s, carbon fiber composite materials have been The unique properties of light weight, high strength, fatigue resistance, strong designability, etc.
, were used in cutting-edge fields such as aviation and aerospace in the early days.
With the continuous improvement of the performance of carbon fiber composite materials and the reduction of costs, they have been used in automobiles, ships, wind power and other fields.
Widely used, rail transit vehicles draw on the application results in different fields, and have made a lot of attempts from secondary load-bearing parts to main load-bearing parts, and accumulated rich experience.
? The domestic application of carbon fiber composite materials in rail transit trains is relatively late, but it has developed rapidly.
A large number of research and development attempts have been made in different application fields such as locomotives, passenger cars, freight cars, high-speed trains, intercity and urban rail, and accumulated rich experience.
? He said that carbon fiber composite materials have gradually become a system solution.
For example, in terms of weight reduction, the overall molding of the train hood reduces weight by 20%; the integrated windshield ferry board is molded to reduce weight by 40%; the overall driver's cab is molded to reduce weight 35%; the console mold is formed to reduce the weight by 30%; the equipment compartment is reduced by 35%; the skirt board is integrally formed, and the weight is reduced by 30%.
? At present, the application of carbon fiber composite materials is gradually developing to the main structure.
He said that the main structure of the next-generation subway driver's cab, car body, frame and equipment compartment at a speed of 140 kilometers per hour is exploring the design process of large-scale carbon fiber composite materials.
, Prepare technical reserves for the migration of the main structure to carbon fiber composite materials, and the application assessment has been completed.
? "Carbon fiber composite materials are gradually developing into the field of high-speed trains.
" He said that carbon fiber composite materials are used in high-speed rail modular structures, which can be single-piece, modular and integrally disassembled to form a pull-out bottom plate and a folding skirt.
, Easy to assemble and maintain.
As a result, compared with the traditional aluminum alloy, the weight is reduced by 35%, and it can withstand vibration and shock, high temperature, high humidity, wind, sand, rain and snow erosion.
? At the scene, he introduced the development status of carbon fiber composite materials in the field of high-speed trains.
? Breakthroughs and challenges? Gao Yulong analyzed the current technological breakthroughs in the application of carbon fiber composite materials in rail transit trains.
? He said that after the R&D and process optimization of the fourth-generation equipment compartment, the application cost of carbon fiber composite materials has reached 1.
5 times, reaching 30% weight loss.
"Driven by mass production, the cost can be equivalent to that of aluminum alloy.
" In terms of material selection, we explored fabrics and prepregs suitable for rail vehicles that meet the technical requirements of low cost, medium strength, medium temperature, weather resistance, and impact resistance.
, Core material, adhesive system; resin system explored the flame retardant modification methods of different resins, surface fire retardant film and other flame retardant solutions, solved the fire prevention problem of the equipment compartment, and explored a fire resistance solution suitable for the structure of rail vehicles .
In terms of inspection and verification, it has passed the verification requirements of equipment cabin frame and module strength test, modal test, fire test, impact test, and non-destructive testing.
"In the future, we need to fully explore the characteristics of composite materials, further optimize the structure, explore efficient and automated production processes, and improve product production efficiency and yield.
" Finally, he analyzed the challenges faced by the application of carbon fiber composite materials.
? "Form a one-stop lightweight solution based on TQC control for carbon fiber composite material selection, structural design, simulation optimization, test verification, manufacturing inspection, maintenance, recycling, etc.
in the rail transit field, and achieve the goal of engineering migration, Still facing daunting challenges.
"