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Heat-treatment cooling process for train wheel

A heat treatment cooling and wheel technology, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as abnormal structure of the wheel tread near the surface layer, affecting wheel performance, etc. The effect of faster cooling

Active Publication Date: 2019-07-26
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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  • Heat-treatment cooling process for train wheel
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  • Heat-treatment cooling process for train wheel

Examples

Experimental program
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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 950-1000 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:

[0088] S1. Heating: heating the rolled and slow-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 ...

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 cooling process for a train wheel, and belongs to the technical field of heat-treatment cooling for train wheels. The heat-treatment cooling process for the train wheel comprises the steps that first, the whole wheel is heated to be completely austenitized; second, the wheel is transferred onto a quenching table and is made to rotate, a gas-mist two-phase flow with the pressure being increased step by step is sprayed onto a wheel tread; and third, the whole wheel is placed into a tempering furnace for heat preservation and is finally taken out to be air-cooled, wherein the gas-mist two-phase flow with the pressure being increased step by step is sprayed onto the wheel tread sequentially through three stages, the rotation speeds V1, V2 and V3 of thewheel, the water pressures P1, P2 and P3 and the quenching times T1, T2 and T3 in the three stages are controlled, and the numbers of started nozzles which are distributed at equal intervals in the circumferential direction of the wheels in the three stages are respectively M, 2M and 3M. By adoption of the heat-treatment cooling process for the train wheel, the capacity to cool the interior of a rim can be improved, the cooling speed is kept balanced and consistent from the wheel tread to the deep interior of the rim, the structure of the whole cross section of the rim is optimized, and accordingly, the radial hardness gradient of the rim is greatly reduced, and the mechanical property and usability of the wheel are greatly improved.

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 Applications(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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