Heat treatment method for double-station rail head
A heat treatment method and dual-station technology, applied in the field of heat treatment, can solve the problems of inability to meet the requirements of production speed and product quality, increase production costs, and low production efficiency, achieve real-time detection and control of quenching temperature, and reduce unit power consumption. , the effect of high production efficiency
Active Publication Date: 2016-08-17
中铁宝桥(宝鸡)路桥建设有限公司
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Problems solved by technology
[0002] With the needs of railway development, the long and short rails of speed-increasing turnouts require induction heat treatment on the surface of all rail heads. The existing medium-frequency induction hardening machine tools cannot heat treat rails longer than 18 meters, which is inefficient and cannot meet the requirements for production speed and product quality.
At the same time, the power consumption is large during use, which increases the production cost
At present, there is no report on the medium-frequency induction hardening technology for two rails at the same time at home and abroad. Most manufacturers use the single-station rail head quenching technology, which has low production efficiency, high power consumption, and poor quality.
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[0010] Double-station rail head heat treatment process: two rails are fixed on the trolley surface, and there is a row of oil top devices at a distance of 3m to lift and drop the rails for pre-deformation. The variable speed trolley drags the two rails through fixed sensors and sprays Box, KGPS thyristor intermediate frequency power supply provides 250KW power, 1000Hz frequency power, double heating inductors and their walking lifting devices respectively inductively heat the two moving rail heads, and the surface of the rail head is under the action of the alternating magnetic field of the sensor. The induction current with the same frequency and opposite direction of the inductor current turns the electric energy into a large amount of heat energy, so that the surface layer of the rail head is rapidly heated to the austenitizing quenching temperature of 920∽980°C, and the stainless steel spray box cools the red-hot rail head with a changing spray amount Quenching makes the su...
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Abstract
The invention relates to a medium-frequency surface induction hardening method for a rail head of a long and thin rail member of a railway track switch and belongs to the technical field of heat treatment technology. Two steel rails are fixed on a bed surface, which can move at variable speed, and the two steel rails can move up-and-down for being subjected to a bending pre-deformation process. An U71Mn steel rail head is heated to 920-980 DEG C in a 1000Hz medium frequency induction heating manner and then is subjected to a spray cooling process with a stainless steel spray box. A surface residual temperature on the steel rail head is controlled in a range from 420 to 580 DEG C by adjusting the spraying volume. A hardened layer is formed on the surface of the steel rail head after the steel rail head being cooled to room temperature, wherein the hardened layer is in the shape of a cap, is more than 8mm in depth and has a metallurgical structure of sorbite. With the hardened layer, the service life of the steel rail is prolonged by 100%. The method can be used for a quenching process of two long steel rails at the same time, is high in production efficiency, is small in deformation and residual stress on the hardened layer and is high in quenching quality.
Description
technical field [0001] The invention relates to a medium-frequency surface induction quenching method for a slender rail head of a railway turnout, and belongs to the technical field of heat treatment. Background technique [0002] With the needs of railway development, the long and short rails of speed-increasing turnouts require induction heat treatment on the surface of all rail heads. The existing medium-frequency induction hardening machine tools cannot heat treat rails longer than 18 meters, which is inefficient and cannot meet the requirements for production speed and product quality. At the same time, the energy consumption of the power supply is large during use, which increases the production cost. At present, there is no report on the medium-frequency induction hardening technology for two rails at the same time at home and abroad. Most manufacturers use the single-station rail head quenching technology, which has low production efficiency, high power consumption,...
Claims
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IPC IPC(8): C21D9/04C21D1/667
Inventor 汪广志张西谋赵鹏飞张刚
Owner 中铁宝桥(宝鸡)路桥建设有限公司