Well known. Modern railway technology aims to make trains run twice as fast as cars and half as fast as planes. The increasing speed of modern railway puts forward higher and higher requirements on the wheel/rail system.
In order to reduce energy consumption, it is necessary to reduce the weight of railway wheels as much as possible, and at the same time increase the resistance of the wheels
The ability of stresses to act. These stresses are caused by increasing thermal loads and radial and lateral loads.
The above requirements can be met by the following: -- using high-performance modern materials, such as vacuum degassing steel; Select a specific lightweight structure wheel profile; Special forming techniques were adopted to increase fracture toughness and reduce residual stress while maintaining the high wave fatigue characteristics of wheels.
The most common wheel shapes are European and American standard wheel shapes. The European wheel is usually followed
U1c812-2-0 standard made of material R7, the wheel plate is double corrugated; The American standard wheel is made of carbon cast steel according to ARR requirements. The casting key contains carbon and varies from 0.57 to 0.80% depending on the type.
Different research institutes and other departments, such as the international railway union (UIC), have compared the cast and Russian wheels
Research and real face. It is found that the general wheel has better fracture toughness. Because of its high safety factor, it can be used in high speed passenger cars. In addition, it is proved that the heat treatment of wheel tread can avoid the generation and development of heat crack (especially the latter), and the wheel shape structure affects the stress distribution and gauge stability
