Braking disc for railway vehicles

Abstract

The invention discloses a braking disc for railway vehicles, which is made of vermicular graphite cast iron. The chemical composition by weight is: 3.45%-3.77% of carbon, 1.86%-2.25% of silicon, 0.5%-0.8% of manganese, less than or equal to 0.02% of sulfur and less than or equal to 0.05% of phosphorus, and the balance is iron, wherein vermicular rate of the vermicular graphite cast iron is larger than or equal to 60%. The braking disc is formed by a left disc body, a right disc body, a first radial connection rib and a second radial connection rib, the diameter of the left disc body is identical to that of the right disc body, the left surface of the left disc body and the right surface of the right disc body are braking work surfaces, and roughness of the two braking work surfaces is respectively 1.6mm-3.2mm. The braking disc for railway vehicles prevents cracks from generating through material replacement and structure adjustment and further avoids safety accidents. The braking distance of the braking disc is moderate, and the braking disc is simple in structure, easy to manufacture, has good economic and technological value and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of rail vehicle braking, and in particular relates to a brake disc for rail vehicles. Background technique [0002] As we all know, the brake disc is one of the important parts of the rail vehicle braking system. The existing brake discs are generally solid thin discs and made of gray iron or ductile iron. For the brake disc made of gray iron, due to the poor toughness and low elongation of gray iron, it is easy to cause cracks in the brake disc, which will cause the brake system to malfunction and even cause safety accidents. [0003] For the brake disc made of ductile iron, due to the poor heat dissipation effect of ductile iron, it is easy to generate thermal stress inside, and because the existing brake disc is a solid structure, its ventilation and heat dissipation capabilities are poor, so it is also It is easy to cause cracks in the existing brake disc and cause safety accidents. [0004] In addition, the fri...

AI Technical Summary

Problems solved by technology

For the brake disc made of gray iron, due to the poor toughness and low elongation of gray iron, it is easy to cause cracks in the brake disc, which will cause the brake system to malfunction and even cause safety accidents

[0003] For the brake disc made of ductile iron, due to the poor heat dissipation effect of ductile iron, it is easy to generate thermal stress inside, and because the existing brake disc is a solid structure, its ventilation and heat dissipation capabilities are poor, so it is also It is easy to cause cracks in the existing brake disc and cause safety accidents

[0004] In addition, the friction coefficient of ductile iron is relatively small, which leads to the long braking distance of the brake disc.

[0005] To sum up, the defect of the prior art is: the brake disc is prone to cracks, which will cause the brake system to break down, and even cause safety accidents

In addition, due to the relatively small friction coefficient of the existing brake disc, its braking distance is too long

Images