Metal surface modification method through emulsion jet

A metal surface and emulsion technology, which is applied in the field of metal material surface processing, can solve the problems of large investment and limitations, achieve uniform jet bubbles, solve cleaning problems, and reduce the surface roughness value Ra

Inactive Publication Date: 2010-11-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since water may cause certain corrosion on the components, although the process technology is simple and does not cause large water consumption, its strengthening effect is affected by the corrosion of water; the further development of oil jet shot peening can avoid corrosion problem, but the oil jet shot peening involves the cleaning of the sample and a large investment. Although the oil circulation method can be used, the consumption of oil is inevitable
These problems limit the application of water (oil) jet peening technology to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Surface modification of ordinary carbon steel. Translucent emulsified oil is used, its pH value is 10, its kinematic viscosity is 50 at 40°C, and it is not more than 1 when corroding 45 steel for 24 hours. At room temperature, according to the ratio of 10% emulsified oil and 90% water, the emulsion is prepared, and the pH value of the emulsion is adjusted to 10 with anhydrous sodium carbonate, the average viscosity is 1.5cSt, and the lower critical Reynolds coefficient is less than 2320; Turn on the emulsion jet machine, control the jet pressure to 50MPa, the diffusion angle of the cavitation bubbles generated by the jet is 6°, the distance from the jet outlet of the nozzle to the surface to be processed is 30cm, and the hardness and fatigue life of the processed surface are significantly improved.

[0013] The emulsion jet machine is a hydraulic pump; the emulsified oil is a commercially available product.

Embodiment 2

[0014] Example 2: Surface modification of SiMn alloy steel. Translucent emulsified oil is used, its pH value is 8, its kinematic viscosity is 45 at 40°C, and it is not more than 1 when corroding 45 steel for 24 hours. At room temperature, the emulsified oil is 6%, and the ratio of water is 94%. Prepare the emulsion, use anhydrous sodium carbonate to adjust the pH value of the emulsion to 8, and the average viscosity is 1.1cSt. Turn on the emulsion jet machine and control the jet flow The pressure is 60MPa, the diffusion angle of the cavitation bubbles generated by the jet is 5°, and the distance from the jet outlet of the nozzle to the surface to be processed is 25cm, and the hardness and fatigue life of the processed surface are significantly improved. Others are the same as in Example 1.

Embodiment 3

[0015] Example 3: Surface modification of ordinary carbon steel. Translucent emulsified oil is used, its pH value is 7, its kinematic viscosity is 35 at 40°C, and it is not more than 1 when corroding 45 steel for 24 hours. At room temperature, the emulsified oil is 3%, water is 97% ratio, the emulsified liquid is prepared, the pH value of the emulsified liquid is adjusted to 7 with anhydrous sodium carbonate, and the average viscosity is 1.0cSt. Open the emulsified liquid jet machine, control The jet pressure is 20MPa, the diffusion angle of the cavitation bubbles generated by the jet is 25°, the distance from the jet outlet of the nozzle to the surface of the part to be processed is 15cm, the hardness of the processed surface is improved, and the rust layer is removed. Others are the same as in Example 1.

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PUM

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Abstract

The invention provides a metal surface modification method through emulsion jet, belonging to the processing technology of metal material surface. The metal surface modification method mainly comprises the following steps: preparing an emulsion which can produce effective cavitation bubbles and jet effect; immersing a component to be processed in the emulsion; adjusting a jet nozzle, a jet pressure and a distance between the jet nozzle and the processed metal; carrying out jet processing on the metal surface in the emulsion medium; taking the emulsion as a medium for producing cavitation jet; and forming the metal surface modification method through emulsion jet, thus improving fatigue strength of a test piece by 56% and 11% respectively. The metal surface modification method through emulsion jet of the invention has the advantages of generating the effective cavitation bubbles and improving processing efficiency of the metal surface, generating no corrosion for the metal surface, polluting no environment, having low cost, being not easy to damage the metal surface, having low investment cost and use cost, good use effects and being easy to be promoted and applied; in addition, residual emulsion does not corrode the metal surface.

Description

technical field [0001] The invention relates to a metal material surface processing technology, in particular to an emulsion jet metal surface modification method. Background technique [0002] Introducing residual compressive stress on the surface can significantly improve the fatigue strength of metal materials. There are many mechanical methods for surface modification, such as shot peening, laser peening, ultrasonic shot peening, deep rolling and rolling, etc., which can lead to residual compressive stress on the surface of the material. The formation of stress. In order to improve the unfavorable effect of solid particle jet on crack initiation, in the 1990s, people put forward the idea of ​​using liquid jet technology to process hardened metal surfaces, and continuously developed water jet and oil jet shot peening technology. In these techniques, high-speed liquid jets generated by high-pressure gas act on the metal surface, causing it to generate residual compressive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04C21D7/06
Inventor 孙智康学勤
Owner CHINA UNIV OF MINING & TECH
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