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A batch quenching method for railway wheels

A wheel and railway technology, applied in quenching devices, furnaces, heat treatment equipment, etc., can solve problems such as poor wheel performance, and achieve the effects of reducing hardness gradient, good application prospects, and safe and convenient operation.

Active Publication Date: 2022-04-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the problem of poor wheel performance caused by conventional quenching methods in the prior art, and to provide a batch quenching method for railway wheels, which is a general batch quenching method with high hardness uniformity in the wear area of ​​the rim, It can effectively avoid the formation of abnormal structure caused by conventional quenching methods near the surface of the tread, and reduce the depth of abnormal structure as much as possible, thereby effectively improving the service performance of the wheel throughout its life cycle and prolonging the service life of the wheel

Method used

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  • A batch quenching method for railway wheels
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  • A batch quenching method for railway wheels

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Experimental program
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Effect test

Embodiment 1

[0036] A kind of batch quenching method that is used for railway wheel of present embodiment, carries out according to the following steps:

[0037]S1. Heating the wheel as a whole until it is completely austenitized; specifically, the wheel in this embodiment is made of conventional ER6 material, and its specification is AG864. Heating temperature 840-860°C, heat preservation 2.5-3.5h, heat the rough wheel as a whole until it is completely austenitized, then place the wheel on the quenching table by the manipulator, turn on the motor of the quenching table, so that the wheel is in a horizontal rotation state, and the motor speed The speed is 90r / min, and the speed of the speed is proportional to the size of the wheel diameter, so that the cooling speed of the rim surface during batch quenching is as uniform as possible, and avoids the phenomenon that the local cooling speed is too fast or too slow.

[0038] S2. Alternate water cooling-air cooling on the wheel, so that the ent...

Embodiment 2

[0047] A kind of batch quenching method that is used for railway wheel of the present embodiment is basically the same as embodiment 1, difference is:

[0048] S1: The wheel in this embodiment is made of conventional ER7 material, and its specification is AT850. The rough wheel is heated as a whole until it is completely austenitized, then the wheel is placed on the quenching table by the manipulator, and the motor of the quenching table is turned on so that the wheel is in a horizontal rotation state, and the motor speed is 40r / min.

[0049] S2: In this embodiment, the cooling water pressure is controlled to be stable at 0.3±0.02MPa, and the first stage of cooling is performed first. The first water cooling time is 12s, and the air cooling time is 8s; the second water cooling time is 8s, and the air cooling time is 5s; the third The first water cooling time is 4s, and the air cooling time is 4s; after that, the water cooling time is 6s, and the air cooling time is 4s, alterna...

Embodiment 3

[0055] A kind of batch quenching method that is used for railway wheel of the present embodiment is basically the same as embodiment 1, difference is:

[0056] S1: The wheel in this embodiment is made of conventional ER8 material, and its specification is HG860E. The rough wheel is heated as a whole until it is completely austenitized, then the wheel is placed on the quenching table by the manipulator, and the motor of the quenching table is turned on so that the wheel is in a horizontal rotation state, and the motor speed is 120r / min.

[0057] S2: In this embodiment, the cooling water pressure is controlled to be stable at 0.2±0.02MPa, and the first stage of cooling is performed first. The first water cooling time is 30s, and the air cooling time is 8s; the second water cooling time is 15s, and the air cooling time is 5s; the third The first water cooling time is 6s, and the air cooling time is 3s; after that, the water cooling time is 5s, and the air cooling time is 3s, alte...

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Abstract

The invention discloses a batch quenching method for railway wheels, which belongs to the field of heat treatment of railway wheels. The present invention is carried out according to the following steps: S1, heating the wheel as a whole until it is completely austenitized; S2, alternately performing water cooling-air cooling on the wheel, so that the entire rim area forms a uniform fine pearlite + ferrite structure; wherein cooling The process includes the first stage and the second stage, the water volume V1 in the first stage<the water volume V2 in the second stage, the alternating number of circulating water / air cooling in the first stage is N1, and the alternating number of circulating water / air cooling in the second stage is N2, N1>N2. The invention overcomes the problem of poor wheel performance caused by conventional quenching methods in the prior art, can effectively avoid the formation of abnormal structures caused by conventional quenching methods near the surface of the tread, and reduce the depth of abnormal structures as much as possible, thereby effectively improving the entire life cycle of the wheels Internal service performance, prolong the service life of the wheel.

Description

technical field [0001] The invention relates to the technical field of heat treatment of railway wheels, in particular to a batch quenching method for railway wheels. Background technique [0002] Quenching is a key process in the heat treatment process of the wheel, which determines the structure and performance of the wheel after quenching. The so-called wheel quenching is to heat the rolled wheel as a whole to above the critical point Ac3, keep it warm for a certain period of time to make the wheel completely austenitized, and then spray water on the tread to cool it. After quenching, the rim structure is fine pearlite + a small amount of ferrite, so that The wear area of ​​the rim has a certain degree of hardness (that is, wear resistance), and the spoke plate is not cooled by spraying water during this process, so it still maintains a normalized state and has a certain degree of plasticity, which can alleviate the impact of the vehicle during operation , vibration, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/34C21D11/00C21D1/667C21D1/18
CPCC21D9/34C21D11/005C21D1/667C21D1/18C21D2211/009C21D2211/005
Inventor 万志健刘学华赵海江波邹强姚三成高伟赵秋艳毛亚男
Owner MAANSHAN IRON & STEEL CO LTD