Electric pulse aftertreatment method and device for improving performance of metal component

Abstract

The invention relates to an electric pulse aftertreatment method and device for improving the performance of a metal component. The method comprises the steps that electric pulse crack arresting treatment is carried out on an initial component, then electric pulse quenching treatment is carried out, and finally two times of electric pulse tempering are carried out. The device comprises a telescopic multi-head electrode support, multiple electrode clamp blocks distributed at the vertexes and the center in a square shape, a lead screw and nut transmission mechanism and a dual spray head quenching device. By means of the electric pulse device, the problems that traditional electric pulse aftertreatment equipment has limitations to large-size components, and quenching of the surfaces of the components is not even are solved. By means of the electric pulse aftertreatment process, a low-defect, even and ultrafine isometric crystal structure is obtained, the residual stress is reduced under the situation that crystals are not grown up, and the comprehensive performance of the laser additive manufacturing metal component is improved. According to the electric pulse aftertreatment method and device, traditional heat treatment equipment such as a resistance furnace is not needed, aftertreatment procedures and energy consumption are reduced, the aftertreatment process is more environment-friendly and is simple and easy to do, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metal post-heat treatment, in particular to an electric pulse post-treatment method and device for improving the performance of metal components. Background technique [0002] Laser additive manufacturing technology is able to produce parts of almost infinitely complex geometries using the fewest processing steps. No specific molds and pre-production costs are required. Due to the use of fully molten standard metal powders, the parts will reach approximately 100% density, thus ensuring Mechanical properties equal or beat traditionally manufactured parts (forged, cast). [0003] However, the metal additive manufacturing process undergoes material melting and solidification in a very short period of time, resulting in a large temperature gradient between the molten pool and the substrate, which will generate high thermal stress and residual stress, making the forming zero Parts are prone to cracks and redu...

AI Technical Summary

Problems solved by technology

The traditional post-treatment process uses heat treatment methods, mainly including: quenching, normalizing, annealing, tempering and rolling thermal deformation, etc. Appropriate combination of heat treatment processes can improve the structure and performance of materials, and it is easy to obtain artificially controllable structure and grain size, and can reduce the residual stress to a large extent, but it needs to go through heat treatment processes such as quenching and tempering and multiple tempering. Long, the grain size level of metal components manufactured by additive manufacturing is high, the traditional heat treatment cannot achieve the purpose of obviously refining grains and crack arrest, and the grains are easy to grow

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