Method for forging and pressing heel of AT steel rail

Abstract

The invention discloses a method for forging and pressing the heel of an AT steel rail, which comprises the following steps of: 1, heating the AT steel rail to the temperature of between 1,160 and 1,250 DEG C in an electric induction heating furnace; 2, forging and pressing the AT steel rail heated by the step 1 by using a three-station forming die on a press; 3, trimming the AT steel rail in a one-station trimming die cavity on the press to remove flash formed at the head and the bottom of the steel rail in the third step of the step 2; and 4, longitudinally withdrawing the AT steel rail from the one-station trimming die cavity to make the AT steel rail at an upright position that a railhead is upward and a rail base is downward and conveying the AT steel rail to a discharging table. The method can improve the heating quality, forming quality and production efficiency of the heel of the AT steel rail.

Description

Technical field [0001] The invention belongs to a steel rail forging and forming technology, and specifically relates to a forging method for the heel end of an AT steel rail. Background technique [0002] Speed-increasing and high-speed railway turnouts in my country use low-profile asymmetrical special section rails with bendable joints at the heel ends. In order to connect the turnouts with the standard section rails on the track, the heel ends of the AT rails must be forged into standard section rails. . Therefore, AT rail heel forging is one of the key technologies to realize the development of speed-up and high-speed railway turnouts in my country. [0003] The heel end of AT rail is a component that is provided in the turnout and connected to the line. At present, the heel end of AT rail in major domestic switch factories is produced by heating forging. The heating for AT rail heel end forming adopts two or three heating multiple forming technology, and the production effici...

AI Technical Summary

Problems solved by technology

[0003] The AT rail heel is the component provided in the turnout and connected to the line. At present, the AT rail heel of the main turnout factories in China is produced by heating forging, and the AT rail heel is formed by two or three heating times. and the heating adopts traditional primary energy coke or natural gas for heating. Key heating parameters such as heating speed, heating speed, and heating temperature cannot be accurately controlled. There are many uncontrollable factors for product heating quality, resulting in large safety hazards in line operation.

[0004] At present, the heels of AT rails in major turnout factories in China are forged with combined and movable block dies. Due to the inherent multi-parting surfaces of the combined dies, the centerlines of the three parts of the rail head, rail waist, and rail bottom after forging do not coincide, that is, they do not coincide. The symmetry is commonly known as the large eccentricity. It is difficult to connect the heel of the AT rail to the rail on the line whether it is bolted or welded on the line. Even if it is connected in an abnormal way, the straightness of the joint will not meet the high-speed and stable train. Operational requirements, the comfort of train operation is greatly reduced

[0005] Therefore, in order to achieve railway modernization and leap-forward development, and to meet the requirements of increasing speed and volume, running stability and comfort, the traditional AT rail heel heating and forming process can no longer meet the existing requirements. Therefore, a research A new type of AT rail heel end forming process and method has become inevitable

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