Magnetic field excitation laser additive device

Abstract

The invention discloses a magnetic field excitation laser additive device. The device comprises a bottom plate, a laser head and a powder feeding head, wherein the laser head and the powder feeding head are connected with a computer control system, and a powder spraying end point of the powder feeding head and a laser beam focus point of the laser head move on the bottom plate along a machining path set by the computer control system; the bottom plate is installed on a workbench through a floating mechanism and arranged in a uniform magnetic field, and magnetic lines of force of the uniform magnetic field vertically penetrate through the bottom plate; and the bottom plate is a conductive thin plate, the front end and the rear end or the left end and the right end of the conductive thin plate are connected with the two pole ends of alternating current correspondingly, and the uniform magnetic field excites the current-carrying bottom plate to vibrate up and down. According to the device, in the laser additive forming process, the magnetic field excites the current-carrying bottom plate to vibrate and stir the internal structure of a formed material, so that to a certain extent, grains are refined, the structure uniformity is improved, stress concentration is reduced and the mechanical property of material forming is improved.

Description

technical field [0001] The invention relates to laser additive manufacturing technology, in particular to a magnetic field excitation laser additive device. Background technique [0002] 3D printing, also known as additive manufacturing, additive manufacturing or additive manufacturing, is a continuous process of adding raw materials under computer control. [0003] Laser additive manufacturing technology is an organic combination of the additive manufacturing principle of 3D printing and laser cladding technology. Metal powder is used as the raw material for molding, and high-energy laser beams are used as the heat source. The processing path is selected according to the layered slice information of the CAD model of the molded part. The laser beam melts the synchronously added metal powder layer by layer, and the metal raw material is rapidly solidified and deposited layer by layer to directly obtain a three-dimensional physical model, that is, to realize the direct manufac...

AI Technical Summary

Problems solved by technology

[0005] However, the current laser additive manufacturing technology still has defects that need to be overcome

Due to the use of high-energy laser beams as heat sources in the laser additive manufacturing process, the energy density is high, and the formed parts during the processing are prone to defects such as cracks, pores, tissue disorder, and large residual stress in the parts. These defects seriously affect the laser. The performance and lifespan of the molded parts obtained by additives also hinder the popularization and application of laser additive manufacturing technology

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