Rail transit mainly includes railway passenger cars, freight trains, high-speed trains, subways, light rails, and maglev trains. What I want to focus on here is the high-speed train, which is what we often call high-speed rail. my country’s high-speed rail manufacturing and operation technology can be said to have reached the world level.
Lightweight rail trains, especially high-speed rail, double-deck passenger cars, and subway trains, are the central topics of rail transportation modernization, and the extensive use of aluminum alloy materials is a very effective way to improve the weight of vehicles. France has long used aluminum alloy materials for the window frames of railway passenger cars. In 1905, the United Kingdom also used aluminum alloy to manufacture the exterior wall panels and interior decoration materials of trams. From 1923-1932, the United States used a large number of aluminum alloys on railway vehicles to manufacture doors and windows, roofs, exterior wall panels, interior wall pipes, bogies, wheel cores, and decorative materials for electric cars and passenger cars. In the following decades, aluminum alloy was widely used in the manufacturing of rail vehicles in various countries around the world. From the initial use of aluminum alloy to make some vehicle components, it has developed to all-aluminum structure vehicles made of aluminum alloy for the basic structural parts of the vehicle.
Application of aluminum profile in rail transit
First, the density of rail transportation aluminum alloy is only equivalent to one-third of steel. Under the same conditions, compared with the copper-containing wear-resistant steel body structure, the weight of the stainless steel body can be reduced by about 15%, and the weight of the aluminum alloy body can be reduced by more than 35%. Due to the reduced weight, the aluminum alloy body can be increased by 10% of the transportation volume.
Secondly, although the fatigue resistance and impact resistance of rail transportation aluminum alloy is not as good as steel, with the development of technology, many high-performance aluminum alloys have been successfully developed and the overall aluminum alloy hollow siding is successfully developed, and then a more reasonable structure is adopted. The design method can completely solve the defect of the appeal of aluminum alloy.
Finally, rail transportation aluminum alloy has better fire resistance, arc resistance, and heat dissipation than steel. In addition, a thin oxide protective film can naturally form on the surface of aluminum alloy. The surface hardness of this film is very high and it is not easy to be damaged. It has better corrosion resistance than steel in the atmosphere.