Processing method of alloy surface micro-cracks

Abstract

The invention relates to a processing method of alloy surface micro-cracks. The aimed micro-crack size range is that the depth is smaller than 0.8 mm, the width is smaller than 0.2 mm, and the length is smaller than 2 mm. A compressive stress layer is formed on the periphery of the alloy surface cracks by using liquid shot-peening repair method, so that micro-cracks with lower depth are eliminated directly, the size of cracks with deeper depth become small, closure effects are produced, spreading rate of the surface micro-cracks is effectively reduced, the surface rigidity and toughness are increased, and components serve continuously; and deformation of alloy after processing is small, and the surface fineness is high. The method is applied in the repair of alloy surface micro-cracks, the operation of the device is flexible, and the process is simple; and limits to workpiece size, operation site and space are small, the processing efficiency is high, energy is saved, and the method is clean and pollution-free.

Description

technical field [0001] The invention relates to mechanical maintenance and surface repairing technology of metal components, in particular to a method for repairing microcracks on the surface of alloy components or materials. Background technique [0002] The service life and service safety of metal structural parts are important issues that the industry has always paid attention to. Metal components are easily affected by the external environment (alternating load, impact, temperature difference, etc.) due to processing and manufacturing or use (alternating loads, impacts, temperature differences, etc.) And eventually lead to component failure and may lead to safety accidents. Therefore, repairing metal components with microcracks or controlling the crack size within the allowable range can prolong the service life of metal components, which has important economic value and social benefits. At present, the treatment method for cracks on the surface of metal materials usua...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent CN101403114 "A Method for Repairing Surface Cracks of Key Parts of Grate" adopts the method of combining laser melting and laser shock treatment to repair cracks. This method belongs to the high-tech field. The laser equipment used is relatively expensive and is suitable for key parts. A small amount of processing of parts is not economical enough for the repair of large areas and large components, and cannot meet the extensive and large-scale application of industrial production

Chinese invention patent CN201239828 "Steel Tube Inner Surface Crack Repair Device" adopts the method of cutting off the metal with cracks on the surface to eliminate the cracks. This method will inevitably affect the dimensional accuracy of the workpiece due to cutting off a layer of metal, and will cause damage to the metal surface. Tensile stress is generated on the surface, and the appearance of new cracks cannot be avoided, so this method of eliminating cracks by cutting is only applicable to individual fields that require low dimensional accuracy of the workpiece

In addition, the Chinese invention patent CN1857850 "A Method for Repairing Metal Cracks" uses a combination of stitching, inlaying, and hole expansion to repair cracks, but this method has some requirements for the flatness of the metal surface, and the repair process is relatively complicated.