Transition section surface hardness treatment method of turnout tongue rail end of steel rail

Abstract

The invention provides a method for treating the surface hardness of the transition section of the heel end of a turnout point rail, which is applied in the technical field of rail production and processing. The processing steps of the hardness treatment method for the surface (2) of the transition section of the heel end (1) of the rail are as follows: 1 ) Heating the rail heel raw material of the processed rail heel (1) to a temperature range of 1050°C-1250°C; 2) Air-cooling and quenching the heated rail heel-end raw material, the wind pressure of the air-cooling quenching is Between 0.20Mpa and 0.35Mpa, after air-cooling and quenching treatment to between 400°C and 450°C, natural cooling is carried out; 3) After the raw material of the rail heel end is naturally cooled, the rail heel end (1) is processed to form the rail heel end (1). The treatment method described above has a simple process and can effectively improve the hardness of the surface of the transition section at the heel end of the switch point rail. During use, there will be no wear and tear pits on the rail when the wheels pass, and there is no need to frequently replace the switch point rail, reducing production costs and rail maintenance costs.

Description

technical field [0001] The invention belongs to the technical field of steel rail production and processing, and more specifically relates to a method for treating the surface hardness of the transition section of the heel end of a switch tip rail of a steel rail. Background technique [0002] Heavy-haul railway transportation has been widely valued by railways all over the world because of its large transportation capacity, high efficiency and low transportation cost, especially in some countries with vast territory and rich resources, the development is particularly rapid. With the increase of the axle load of heavy-duty trains, the damage to the rail track structure will inevitably be accelerated. Under the operating conditions of heavy-duty railways with large axle load, high density and large transport volume, the wear of the steel track switch point rail is much greater than that of the ordinary line switch rail. In the forging process of the heel end of the steel tra...

AI Technical Summary

Problems solved by technology

In the forging process of the heel end of the steel rail switch point rail, there has been no good way to solve the problem that the hardness of the heel transition section of the steel track switch point rail is too low, resulting in the hardness of the transition section at the heel end being lower than that of other positions

In this way, when the rail is actually used, the wheel will soon wear out a saddle-shaped pit in the transition section of the tip rail of the steel rail switch, thereby affecting the driving safety of the vehicle and the overall service life of the steel rail switch

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