A stress-controlled 3D printing remanufacturing method for metal parts

Abstract

The invention discloses a stress-controlled 3D printing remanufacturing method of a metal part. Firstly, a metal part body sample and a cladding sample are prepared, and laser parameters required for the same residual compressive stress are obtained by laser shock; processing, and use the image recognition method to determine the repair area and repair margin of the part; then use the laser 3D printer to repair the metal parts layer by layer, so that the size of the repair part reaches the original design size of the part; finally use laser shock to eliminate the residual tensile stress, and then use The laser shock strengthening method forms a residual compressive stress layer on the working surface of metal parts. The invention uses laser 3D printing to repair the parts, the overall deformation of the parts is not large, and the dimensional accuracy of the repair is easy to control, and no subsequent processing is required; the overall strength of the repaired parts is the same, and the residual compressive stress of the strengthening layer on the surface of the parts after using laser shock strengthening Values ​​are balanced to extend the service life of parts after remanufacturing.

Description

technical field [0001] The invention relates to the technical field, in particular to a stress control 3D printing repair method. Background technique [0002] Metal mechanical parts are prone to failure in the form of fatigue cracks, wear, pitting, fracture and spalling after long-term use, resulting in reduced performance or scrap of mechanical parts. In order to reduce losses, reduce waste of metal resources, and save operating costs of enterprises, repair and remanufacture of failed parts is often performed. General remanufacturing methods include surfacing, cladding, arc deposition, etc. [0003] For example, the Chinese invention patent with the application number of 201110326721.8 discloses a hardened gear and a hardened gear repair process, including the pre-treatment stage, pretreatment of the hardened gear, so that the hardened gear meets the repairing requirements; the repairing stage, Form a cladding layer on the surface of the hardened gear; in the processing ...

AI Technical Summary

Problems solved by technology

[0004] The filling material used in conventional repair and remanufacturing is generally different from the main material composition of the part. During the use of the repaired part, fatigue defects are prone to occur at the interface between the two materials

In addition, due to the influence of heat in the remanufacturing process, there is often a residual tensile stress layer on the surface of the remanufactured part, which reduces the fatigue strength and wear resistance of the part and shortens the fatigue life of the part.

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