Metal crack repair method

Abstract

The present invention relates to the field of laser processing, particularly to a metal crack repair method. According to the present invention, mainly based on metal device surface cracks, a microcapsule adhesive is used to fill the crack, and then a laser shocking peening method is used to repair the metal surface crack, wherein a repair agent microcapsule and a curing agent microcapsule are completely mixed according to a volume ratio of 15:2 to prepare the microcapsule adhesive; when the laser shocking peening is performed on the metal crack filled with the microcapsule adhesive and the surrounding area, the capsule wall of the microcapsule adhesive is broken under the effect of the laser shocking wave pressure and the repair agent and the curing agent outflow so as to adhere the crack and achieve the ideal adhesion effect; with the laser shocking effect, the crack and the surrounding area are strengthened, the surface layer structure is compact, and the mechanical property is significantly improved so as to effectively prevent the crack diffusion and the generation of the new crack; and the dual effect is provided.

Description

technical field [0001] The method of the invention relates to the field of laser processing, in particular to a method for repairing metal cracks through the composite action of laser shock strengthening and microcapsule adhesive, which is suitable for repairing shallow scratches on the surface of machine tool guide rails, aviation key parts, and other metal parts. Injury and other micro-damage cracks. Background technique [0002] Laser shock peening (also called laser peening) is a new type of material surface strengthening technology, which uses the shock wave mechanical effect induced by strong laser to process materials, and has the characteristics of high pressure, high energy, ultrafast and ultrahigh strain rate, etc. The residual compressive stress layer can effectively eliminate the stress concentration inside the material and inhibit the initiation and expansion of cracks, and can significantly improve the fatigue life, corrosion resistance and wear resistance of m...

AI Technical Summary

Problems solved by technology

[0003] Most of the industrial parts are made of metal materials. Metal alloy parts are prone to cracks due to wear, impact, fatigue and other effects during work, resulting in scrapped materials. Repair technology is used to repair parts with crack defects and prolong their life. The service life can obtain considerable economic benefits; the current crack repair methods include manual arc welding, submerged arc welding, vibration surfacing, chrome plating, metal spraying, metal bonding, etc., among which manual arc welding, submerged arc welding, vibration surfacing Welding is suitable for repairing deep and wide metal damage. The welding effect is not ideal for narrow and shallow metal surface cracks. The welding part is often higher than the surface of the metal substrate, and it will cause thermal damage to the area around the weld; chrome plating and Metal spraying will cause the surface thickness of the base material to increase, which exceeds the work design requirements, and the ability of chrome plating and spray coating to withstand contact stress is not high; Part of the curing reaction has occurred before the cracks are filled after mixing evenly, thereby reducing the repair effect; in actual industrial production engineering, most of the cracks are narrow, shallow, and irregular micro-damage cracks, and repairing at this time can avoid cracks in time Deepening, the easiest to restore mechanical properties, to meet the needs of continuous work and production, and the cheapest economic cost; microcapsule metal adhesive is a granular substance, which can fully fill every corner of the crack and gap, and repair the micro-damage of metal parts It is convenient and quick to operate, which has very important practical significance. However, the number of microcapsules ruptured by the capsule wall of the microcapsule adhesive under the general pressure method is limited, and the amount of adhesive flowing out is small, so the repair effect is general and cannot be avoided. Crack propagation and creation of new cracks in the surrounding area

Images