GB Standard Steel Rail Main use of materials

Shaped buckle work piece of the main use of the material bending deformation performance, processing is relatively simple, the cost is often lower, but because of the bolt fastening and opening, prone to stress concentration in the part of the surface bending moment is the largest cross- The weakest. China's early development of the arched shrapnel fastener, in the use of bolt tightening easy to break, the vibration generated when the train is easy to make the shrapnel relaxation, and even some nuts from the bolt out. In addition to the subway line DT ?, DT ? fasteners using shrapnel as a buckle, the other track line is no longer on the other side of the track is not longer than the track, Using shrapnel fasteners. The buckle buckle is used to make use of the bending deformation properties of the material, but also the use of the material of the torsional deformation performance (especially the circular cross-section spring), so the elasticity is generally better, while basically no cross-section weakened, so the material utilization , In the conventional line, generally want to buckle buckle buckle pressure, good elasticity, this aspect of the buckle fasteners have obvious advantages. At present, most of China's railway and other rail transportation are using spring-loaded buckle parts. The form of spring buckle parts in China is as follows: there are bolts in the form of omega structure, such as type ? and type ? , Such as ? type spring, DTVI fastener with a bomb, Guangzhou Metro with PR-type bombs, etc .; there are Other structure of the form of the bomb, double toe spring, the middle of the projectile.

   Railway rails are components that support locomotives and locomotives, and the rails are fixed to the sleeper of the track bed by elastic fasteners. The elastic fastener's buckle is mainly a spring, which is bent and twisted by the spring, resulting in buckle pressure acting on the track, long-term effective guarantee of reliable connection between the rails, as far as possible to maintain the integrity of the track, Relative to the sleeper of the vertical and horizontal movement, to ensure that the track from the normal, so as to ensure the safety of rail vehicles driving. In addition, because the train wheel and rail contact is a rigid contact, it is inevitable to produce vibration, and the elastic structure of the special shell so that it also has to absorb the impact of vehicles passing through the shock energy to achieve the role of shock absorption. The spring is subjected to repeated stress under repeated stress, which is subjected to various effects such as bending, twisting, fatigue and corrosion. It also suffers from extremely high momentary impact loads when the vehicle passes, so the performance of the spring is very strict The

With the increase of the axle load of the railway locomotive and the improvement of the running speed of the train, as well as the development of the urban rail transit and the subway, the spring is also becoming a key link in the continuous development of the track structure. Countries are concerned. China is a vast country, climate, transport conditions, regional differences in the country, the need for a variety of different performance requirements of the projectile to meet the different requirements of different tracks. Such as in the conventional line, the need for buckle pressure, good elastic spring, to meet the needs of heavy-duty, high-speed lines; and viaduct track seamless circuit, in order to reduce the interaction between the rail and the bridge, The resistance is small, and to ensure that the elasticity of the elasticity, that is, to ensure that the ball is low enough to ensure that the train through the undercover cushion due to compression caused by the buckle pressure loss is small, fasteners do not loose.

Although it is a small public work device, but it is an important part of the track, because of its large demand, about 7000 per kilometer, its reliability is directly related to the safety of traffic.