Metal surface compound strengthening processing process and application thereof in locomotive wheel processing and turning

A technology of metal surface and processing technology, applied in locomotive wheels, high-power locomotive wheel processing and turning repair, can solve the problems affecting wheel-rail interaction, brake braking and steering adverse effects, etc., to improve wear resistance performance, prolong wheel fatigue life, and improve wear resistance

Active Publication Date: 2017-06-13
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But between the wheels and rails, excessive lubrication can affect the interaction between the wheels and rails, adversely affecting traction, braking and steering

Method used

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  • Metal surface compound strengthening processing process and application thereof in locomotive wheel processing and turning
  • Metal surface compound strengthening processing process and application thereof in locomotive wheel processing and turning
  • Metal surface compound strengthening processing process and application thereof in locomotive wheel processing and turning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0062] Examples 1-8 A metal surface composite strengthening process

[0063] Embodiments 1-8 are basically completed according to the following steps, but the specific conditions and process parameters of steps I and II are shown in Table 1.

[0064] I. Solid Lubricant Coating

[0065] Carry out turning processing of J11 type wheel steel, and the roughness is controlled at Ra3.2; the block solid lubricant is coated on the surface of the metal sample after turning by air pressure, and the coating pressure is controlled at 300-400N. The thickness of the layer is 30-50 μm;

[0066] II. Ultrasonic rolling

[0067] Use hot air at a temperature of 480-600°C as the heat source, and set the heat source at the front end of the indenter for ultrasonic rolling, 3-8mm away from the rolling point; heat or not heat the metal sample according to the conditions shown in Table 1; In the case of existence, a smooth spherical indenter is used for ultrasonic rolling, with an ultrasonic frequ...

Embodiment 9～16

[0079] Examples 9-16 A metal surface composite strengthening process

[0080] Embodiments 9-16 are basically completed according to the following steps, but some specific conditions and process parameters of steps I and II are shown in Table 2.

[0081] I. Solid Lubricant Coating

[0082] Carry out turning processing on J11 wheel steel, the roughness is shown in Table 2; block molybdenum disulfide is coated on the surface of the metal sample after turning by air pressure, the coating pressure is controlled at 300-400N, and the thickness of the coating layer is shown in Table 2. Table 2;

[0083] II. Ultrasonic rolling combined with real-time heating

[0084]Use hot air with a temperature of 580-600°C as the heat source, and the heat source is set at the front end of the indenter of the ultrasonic rolling, 3-8mm away from the rolling point; heat the metal sample so that the surface temperature of the heated workpiece is 460-480°C; In the presence of oil, a smooth spherical...

Embodiment 17

[0110] Example 17 Surface Strengthening Technology of New Locomotive Wheel

[0111] The newly manufactured HXD1 type locomotive wheel, with a diameter of 1.250 meters, undergoes surface strengthening treatment through the following steps:

[0112] 1) Turning the locomotive wheel, the roughness is controlled at Ra3.2~Ra6.3;

[0113] 2) Coating massive molybdenum disulfide on the surface of the wheel after turning by air pressure, and the thickness of the coating layer is 40 μm;

[0114] 3) In the presence of a small amount of lubricating oil, use hot air to heat the wheels. The temperature of the heat source is 500-520°C. The heat source is set at the front end of the ultrasonic rolling head, and the distance from the rolling point is 3-8mm, so that the surface temperature of the heated wheel is 400-520°C. Between 480°C, a smooth spherical indenter is used for ultrasonic rolling, the pressure of the rolling indenter is controlled by air pressure at 1300-1500N, and the ultras...

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Abstract

The invention provides a metal surface compound strengthening processing process. The metal surface compound strengthening processing process comprises the following operation steps of: I, coating a blocky solid lubricating agent to a surface of a turned metal workpiece; II, in the presence of trace lubricating oil, heating the surface of the metal workpiece coated with the solid lubricating agent, increasing the temperature of the surface of the heated workpiece to 300-480 DEG C, and performing ultrasonic rolling; precisely controlling dose of the lubricating oil to 10-15 ml / min; and repeating the ultrasonic rolling operation until hardness of the surface of the metal workpice reaches requirements. The invention further provides application of the composite strengthening processing process to locomotive wheel processing and turning. Surface hardness and initial wear resistance of the processed locomotive wheel are greatly improved, a surface plastic deformation layer is 250-300 [mu]m, depth of an effective hardening layer is 1.5-3 mm, and an equivalent residual stress value of a surface layer can be 270-350 MPa.

Description

technical field [0001] The invention belongs to the field of mechanical processing and metal surface treatment, and in particular relates to a composite processing technique for enlarging metal surface strengthening layers by comprehensively utilizing various means, and its application in locomotive wheels, especially the processing and turning repair of high-power locomotive wheels . Background technique [0002] As we all know, wheel-rail railway transportation is based on the adhesive traction force and adhesive braking force generated by the wheel-rail interaction to realize the train operation. Due to the friction between the wheels and rails, during the operation of the train, not only the rolling of the wheels will cause wear on the treads and rims of the wheels, but the sliding of the wheels on the rails will also cause damage to the treads; and the rails will also be damaged due to friction. Regardless of the wheels or rails, when the wear reaches the limit, it mus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/06
CPCC21D7/06
Inventor 杨兴宽刘颖鑫武小鹏王冬冬申灏
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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