Metal part remanufacturing method adopting stress control and 3D printing

Abstract

The invention discloses a metal part remanufacturing method adopting stress control and 3D printing. The metal part remanufacturing method comprises steps as follows: firstly, a body sample and a cladding sample of a metal part are prepared, and laser parameters required by the same residual compressive stress are acquired through laser shock; secondly, a to-be-repaired metal part is preprocessed, a repairing area and a repairing allowance of the part are determined with an image recognition method; the metal part is subjected to cladding repair layer by layer by the aid of a laser 3D printer, and the size of a repaired part reaches the originally designed size of the part; finally, residual tensile stress is eliminated through the laser shock, and then a residual compressive stress layer is formed on the working surface of the metal part with a laser shock processing method. According to the metal part remanufacturing method, the part repairing is performed by adopting laser 3D printing, the overall deformation of the part is not large, further, the repairing size precision is easy to control, and follow-up processing is not required; the repaired parts acquire equal overall strength, a value of residual compressive stress of a part surface strengthening layer after the laser shock processing keeps balance, and the service life of the remanufactured part is prolonged.

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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