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A cooling process for heat treatment of railway wheels

A heat treatment cooling and wheel technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of abnormal structure near the surface of the wheel tread and affect the performance of the wheel, so as to reduce the abnormal structure of the near surface of the wheel tread, reduce the speed of the wheel, Optimizing the effect of full-section tissue transformation

Active Publication Date: 2020-11-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quenching process described in this invention is likely to cause abnormal structures near the surface of the wheel tread, which affects the performance of the wheel

Method used

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  • A cooling process for heat treatment of railway wheels
  • A cooling process for heat treatment of railway wheels
  • A cooling process for heat treatment of railway wheels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The railway wheel in this embodiment is a mining truck wheel, with a nominal diameter of 950-1000 mm and a weight of about 500 kg. Its main chemical components and mass percentages (wt%) are as shown in Table 1. The process steps are as follows:

[0069] S1. Heating: heating the rolled and slow-cooled wheel as a whole until it is fully austenitized;

[0070] S2. Quenching and cooling: After the heating is completed, take the railway wheels out of the heating furnace, transfer them to the horizontal quenching platform, turn on the frequency conversion servo motor in the horizontal quenching platform to keep the railway wheels in a rotating state, and keep the inner side of the railway wheels facing up; then open The quenching electronic control unit in the horizontal quenching table controls the start-up of the valves of the water and gas ring pipelines, and uses three-stage pressure step-increasing aerosol two-phase flow to spray the wheel tread;

[0071] In the first ...

Embodiment 2

[0087] The railway wheel in this embodiment is a mining truck wheel with a nominal diameter of 950-1000mm and a weight of about 500kg. Its main chemical components and mass percentages (wt%) are as shown in Table 1. The process steps are as follows:

[0088] S1. Heating: heating the rolled and slowly cooled wheel as a whole until it is fully austenitized;

[0089] S2. Quenching and cooling: After the heating is completed, take the railway wheels out of the heating furnace, transfer them to the horizontal quenching platform, turn on the frequency conversion servo motor in the horizontal quenching platform to keep the railway wheels in a rotating state, and keep the inner side of the railway wheels facing up; then open The quenching electronic control unit in the horizontal quenching table controls the start-up of the valves of the water and gas ring pipelines, and uses three-stage pressure step-increasing aerosol two-phase flow to spray the wheel tread;

[0090] In the first s...

Embodiment 3

[0101] The railway wheel in this embodiment is a mining truck wheel, with a nominal diameter of 950-1000 mm and a weight of about 500 kg. Its main chemical components and mass percentages (wt%) are as shown in Table 1. The process steps are as follows:

[0102] S1. Heating: heating the rolled and slow-cooled wheel as a whole until it is fully austenitized;

[0103] S2. Quenching and cooling: After the heating is completed, take the railway wheels out of the heating furnace, transfer them to the horizontal quenching platform, turn on the frequency conversion servo motor in the horizontal quenching platform to keep the railway wheels in a rotating state, and keep the inner side of the railway wheels facing up; then open The quenching electronic control unit in the horizontal quenching table controls the start-up of the valves of the water and gas ring pipelines, and uses three-stage pressure step-increasing aerosol two-phase flow to spray the wheel tread;

[0104] In the first ...

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Abstract

The invention discloses a heat treatment and cooling process for railway wheels, which belongs to the technical field of heat treatment and cooling for railway wheels. The steps of the method include: first heating the whole wheel until it is completely austenitized; then transferring it to a quenching station, keeping the wheel in a rotating state, and spraying the tread of the wheel with a gas mist two-phase flow with increasing pressure; then putting the whole wheel into a tempering furnace for heat preservation , and finally take out the air cooling; the pressure step-increasing aerosol two-phase flow jet wheel tread includes three stages in turn, control the wheel speed v1>v2>v3 in the three stages, and the water pressure P1

Description

technical field [0001] The invention relates to the technical field of heat treatment and cooling of railway wheels, in particular to a heat treatment and cooling process of railway wheels. Background technique [0002] Continuous high-flow water spraying forced cooling on the tread surface is a common railway wheel heat treatment cooling technology at home and abroad. It is an important way to achieve strong hardening of the wheel rim and obtain fine pearlite structure, thereby obtaining excellent contact fatigue resistance and high wear resistance. However, the metal near the surface of the tread is in direct contact with the cooling water, and the heat is directly taken away by the cooling water, and the cooling rate is extremely fast, exceeding the lower critical cooling rate of steel (the maximum cooling rate for complete pearlite transformation), resulting in hard and brittle non-pearlite The formation of tissue (that is, abnormal tissue) will destroy the performance o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/34C21D1/18C22C38/18C22C38/04C22C38/02
CPCC21D1/18C21D9/34C22C38/02C22C38/04C22C38/18
Inventor 姚三成宫彦华陈刚钟斌江波万志健邹强庞晋龙
Owner MAANSHAN IRON & STEEL CO LTD
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