Anti-fretting fatigue protection method for laser shock and coating lubrication composite modification

A technology of laser shock and composite modification, which is applied in coating, laser welding equipment, metal material coating process, etc., can solve the problems of performance interference or conflict of composite modification technology, prolong the germination life, reduce wear and friction Good effect of shear stress and contact surface lubrication state

Inactive Publication Date: 2020-11-20
DALIAN UNIV OF TECH +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] According to the above-mentioned technical problems that the compound modification technology in the fretting fatigue protection technology is prone to performance interference or conflict, an anti-fretting fatigue protection method of laser shock and coating lubrication compound modification is provided

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  • Anti-fretting fatigue protection method for laser shock and coating lubrication composite modification
  • Anti-fretting fatigue protection method for laser shock and coating lubrication composite modification

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Embodiment 1

[0028] Such as Figure 1-2 As shown, the present invention provides an anti-fretting fatigue protection method of laser shock and coating lubrication compound modification, which combines laser shock technology and coating lubrication technology, which is a new type of integrated surface protection technology, specifically :

[0029] First, laser shock strengthening technology is used to prepare micro-pit groups (micro-pit texture) in a regular array on the surface of the metal material. The diameter of a single pit is 1-10mm, and the depth of the pit is 1-20μm; then the coating preparation technology is used Apply lubricant to the surface of the dimple.

[0030] Further, the laser shock process is realized according to the laser shock path through a single-spot partial overlapping method, the shape of the light spot is circular or square, and the overlapping rate between the light spots is 10%-50%. Can be greater than 100%.

[0031] Further, ion peening, plasma spraying ph...

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Abstract

The invention provides an anti-fretting fatigue protection method for laser shock and coating lubrication composite modification. The method comprises the following steps of: preparing micro-pit groups distributed in a regular array on the surface of a metal material by adopting a laser shock strengthening technology, wherein the diameter of a single pit is 1-10mm, and the depth of the pit is 1-20microns; and coating the surfaces of the pits with a lubricant by adopting a coating preparation technology. The method fully utilizes the micro-pit modeling characteristics of laser shock and the introduction characteristics of residual compressive stress of the surface layer, and introduces three strengthening factors comprising the residual compressive stress, coating lubrication and surface micro-pit texturing into the surface layer of the material through a laser shock surface texturing and coating lubrication composite modification technology, and the factors synergistically improve thefretting fatigue performance of the material. The composite modification technology can improve the fretting wear resistance of the coating, reduce the surface friction force and slow down the residual stress relaxation speed in order to achieve the strengthening effect of prolonging the fretting fatigue life.

Description

technical field [0001] The invention relates to the technical field of surface protection, which is used to improve the fretting fatigue performance of materials, relates to a surface modification treatment method for metal structural parts, and in particular relates to a fretting fatigue protection method through composite modification of laser shock and coating lubrication. Background technique [0002] Commonly used riveted connections, bolted connections, tenon connections and other fastened parts in the machinery manufacturing industry are prone to fretting fatigue in vibration environments, and their contact surfaces undergo extremely small displacements (in the order of microns), resulting in friction and wear on the contact surfaces , leading to a significant reduction in fatigue strength or life, such as the Ti-1023 titanium alloy fatigue strength drops to 80% under fretting loads. The protection strategy of fretting fatigue is mainly to prolong the service life thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C23C4/134C23C4/02C23C4/04C23C4/08C23C24/04C25D5/34
CPCC21D10/005C23C4/134C23C4/02C23C4/04C23C4/08C23C24/04C25D5/34B23K26/356
Inventor 付雪松李志强曹子文罗懋钟周文龙陈国清祖宇飞
Owner DALIAN UNIV OF TECH
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