High-speed train brake disc and brake disc material thereof

Abstract

The invention discloses a high-speed train brake disc. A disc body center hole and radiating ribs are arranged on a disc body, the ratio R / D of the circular arc radius R of each radiating rib to the outer diameter D of the disc body ranges from 0.4 to 0.6, the inflow angle beta 1 of each radiating rib ranges from 0 degree to 15 degrees, the outflow angle beta 2 of each radiating rib ranges from 25 degrees to 35 degrees, and the ratio B2 / B1 of the height B2 of each radiating rib to the thickness B1 of the disc body ranges from 1.0 to 1.2. A brake disc material of the high-speed train brake disc comprises, by weight, 0.16% to 0.25% of C, 0.25% to 0.60% of Si, 0.80% to 1.30% of Mn, 0.70% to 1.20% of Cr, 0.01% to 0.03% of W, 0.80% to 1.30% of Ni, 0.40% to 0.70% of Mo, 0.05% to 0.20% of Cu, 0.18% to 0.25% of SiC, 0.20% to 0.30% of Al2O3, 0.03% to 0.15% of V, 0.0050% to 0.025% of N, 0.005% to 0.20% of Re, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, and the balance Fe. According to the high-speed train brake disc, forced guiding of a radiating air field can be achieved, the radiating speed is high, overall strength is high, and the high-speed train brake disc is widely applicable to braking systems of various high-speed trains.

Description

technical field [0001] The invention relates to a high-speed train braking device, in particular to a brake disc in the high-speed train braking device. The invention also relates to high-speed train brake disc materials. Background technique [0002] With the increase of train speed, the brake power and brake temperature rise of the train are also getting higher and higher. Because disc brakes have significant advantages over other friction braking forms in terms of braking power and reducing heat damage to wheel treads, they have been widely used. Disc brakes have become an essential basis for high-speed trains to finally stop braking method. [0003] Disc brakes use the friction between the brake disc and the brake pad to obtain the braking force. Once friction occurs, the temperature of the contact friction part between the brake disc and the brake pad will rise, and the faster the vehicle speed, the higher the temperature rise. After the brake disc is heated by fr...

AI Technical Summary

Problems solved by technology

As far as the structure of the brake disc is concerned, since the brake disc has a disc-shaped structure, the braking speed on different circumferences of the friction surface of the brake disc varies greatly, thus forming uneven thermal stress. The temperature is much lower than that of the outer side of the disc, and the brake disc made of homogeneous material has the same heat resistance and wear resistance of each part. This consistency just brings about the inconsistency of fatigue and wear. Accelerates the occurrence probability and expansion speed of thermal cracks, which is not conducive to the improvement of the service life of the brake disc

Therefore, as the train continues to increase in speed, when its speed reaches or even exceeds 300Km / h, the existing brake disc materials and structural design cannot well meet the braking requirements of high-speed trains.

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