Rail heat treatment system and heat treatment process

Abstract

The invention discloses a fixture for steel rail forging, and belongs to the field of mechanical equipment. The fixture is provided with transverse and longitudinal motion platforms and a liftable device for realizing three-dimensional motion of a steel rail in all directions, and meanwhile, is provided with a rotating disc for realizing large-angle rotation of the steel rail. The invention further discloses a steel rail forging device adopting the fixture; and the device comprises a medium-frequency heating furnace, forging equipment and an infrared distance measurer, realizes full-automatic forging of the steel rail, and improves the machining efficiency. Meanwhile, the invention further discloses a steel rail heat treatment system adopting the forging device; and the system comprises a conveying platform, air cooling equipment, a normalizing furnace and a pushing table, and can further reduce machining procedures, reduce the energy consumption and improve the machining efficiency. In addition, the invention discloses a steel rail heat treatment process according to the system; and the process comprises a forging process and a quenching process, and can realize thorough hardening of a rail head and uniform quality in machining of the steel rail.

Description

technical field [0001] The invention relates to the field of rail processing equipment, in particular to a rail heat treatment system and a heat treatment process. Background technique [0002] At present, the AT point rails for railway turnouts are processed by forging and quenching at the heel of standard rails. There is a long slide rail, and the rail is hoisted by the crane to the slide rail, and then sent to the intermediate frequency heating furnace, and the heel of the rail is heated in the intermediate frequency heating furnace. After heating, the intermediate frequency heating furnace and the slide rail end Stretch the rail onto the slide rail, and extend the heated end of the rail on the slide rail into the forging die of the forging equipment for forging. At this time, during forging, the non-heated part of the rail is only placed on the slide rail. When the rail heel is forged, the rail will produce severe co-vibration, which makes the noise too loud during forg...

AI Technical Summary

Problems solved by technology

[0004] (1) The degree of automation of the equipment is extremely low, and it needs to be transferred continuously. The entire processing procedure occupies a large area, the processing equipment is relatively scattered, and multiple stacking points need to be set up in the intermediate processing procedure, which is not convenient for workshop management. Secondly, the labor cost is high and labor High strength and extremely low production efficiency;

[0005] (2) When forging the heel of the rail, it needs to be repeatedly forged 2-3 times to form a good shape, and the noise during forging is too large, and each time the rail is forged, the rail needs to be manually rotated by 180° after the rail is heated before forging , and repeated heating during forging will also increase energy consumption;

[0006] (3) The steel rail needs to be normalized before quenching, and after normalizing, it needs to be cooled naturally, and the natural cooling of the steel rail from 950-1000 °C takes a long time to further reduce production efficiency;

[0007] (4) After the rail is cooled, it is necessary to transfer the rail to the quenching machine. When the rail head is quenched, because the water spray is used to quickly cool the rail head, the depth of the quenching layer of the rail head is relatively shallow, usually Within 5-10mm, and during spray cooling, it cools the rail head unevenly, the metallographic structure of the rail head is uneven, and bad structures such as martensite are prone to appear; secondly, the spray cooling is to atomize the water by blowing, and the water The atomization effect of the water is directly related to the quenching quality, and the atomization effect of water is affected by many factors at this time, including wind pressure, water pressure, easy blockage of nozzle holes or water column due to poor atomization of individual nozzle holes, and machine tool heating. Influenced by factors such as power, frequency, machine tool travel speed, season and weather, the stability of the equipment is poor, so not only the quality of the same root product cannot be guaranteed, but the uniformity of products between different batches is also extremely difficult to guarantee, that is, the quenching effect of the product The discreteness is large, which is not convenient for product quality management;

[0008] (5) The rail head processed by traditional technology has a shallow quenching layer, and the metallographic composition of the rail head is uneven, its wear resistance is poor, and the service life of the rail is short

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