China Supplier Offers Price Concessions For AllGB Standard Rail Models

Improving GB Standard Steel Rail head section design is also one of the ways to improve stiffness and wear resistance.

In the rail head section of the early rail, the tread surface is relatively gentle, and the arcs with smaller radius are used on both sides. Until the 1950s and 1960s, it was found that regardless of the shape of the originally designed rail head, after the wear of the train wheels, the shape of the tread on the top of the rail was almost all circular, and the radius of the arc on both sides was relatively large. The experimental simulation found that the peeling of the rail head is related to the excessive wheel-rail contact stress at the inner fillet of the rail head. In order to reduce the damage of rail stripping, all countries have modified the arc design of the rail head to minimize the plastic deformation.

First, countries have followed such a principle in the design of the GB Standard Steel Rail head tread: the arc of the rail top tread conforms to the size of the wheel tread as much as possible, that is, the size of the tread arc, such as the 59.9kg/m rail in the United States, the rail head arc is adopted R254-R31.75-R9.52; the 65kg/m rail of the former Soviet Union, the rail head arc adopts R300-R80-R15; the UIC 60kg/m rail, the rail head arc adopts R300-R80-R13. It can be seen from the above that the main feature of the section design of the modern rail head is the use of complex curves and three radii. On the side of the rail head, a straight line with a narrow top and a wide bottom is adopted, and the slope of the straight line is generally 1:20~1:40. A straight line with a large slope is often used at the lower jaw of the rail head, and the slope is generally 1:3 to 1:4.

Second, in the transition zone between the GB Standard Steel Railhead and the rail waist, in order to reduce the cracks caused by stress concentration and increase the frictional resistance between the fishplate and the rail, a complex curve is also used in the transition area between the rail head and the rail waist, and a large radius design is adopted in the waist. For example, UIC's 60kg/m rail uses R7-R35-R120 in the transition zone between the rail head and the waist. Japan's 60kg/m rail uses R19-R19-R500 in the transition zone between the rail head and the waist.

Third, in the transition zone between the rail waist and the rail bottom, in order to achieve a smooth transition of the section, a complex curve design is also adopted, and the gradual transition is smoothly connected with the slope of the rail bottom. Such as UIC60kg/m rail, is to use R120-R35-R7. Japan's 60kg/m rail uses R500-R19. China's 60kg/m rail uses R400-R20.

Fourth, the bottom of the rail bottom is all flat, so that the section has good stability. The end faces of the rail bottom are all at right angles, and then rounded with a small radius, usually R4~R2. The inner side of the rail bottom is usually designed with two sets of oblique lines, some of which adopt double slope, and some adopt single slope. For example, UIC60kg/m rail adopts 1:275+1:14 double slope. Japan's 60kg/m rail adopts 1:4 single slope. China's 60kg/m rail adopts 1:3+1:9 double slope.