Metal additive manufacturing device and method based on high-speed shot peening

Abstract

The invention discloses a metal additive manufacturing device and method based on high-speed shot peening. The metal additive manufacturing device includes peening shot, a shot peening adjustment mechanism, a recycling material box, a forming box, a material storage box, a metal powder preheater, an X-Y scanning mirror, a controller and a continuous laser. According to the metal additive manufacturing device, SLS or DMLS and a shot peening technology are comprehensively used, by precisely controlling continuous laser parameters (including continuous laser spot shape, continuous laser scanningspeed and the like), nozzle diameter, nozzle distance, coverage rate, shot peening speed, quality flow rate, shot peening time and action areas, the surfaces of parts are impacted within a certain period of time, so that the surface structure is refined, residual compressive stress is introduced, and a surface structure is optimized, so that the surface strength and hardness, fatigue-resistance performance, stress-resistance corrosion cracking and high-temperature-oxidation resistance of a metal material can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and in particular relates to a metal additive manufacturing device and method based on high-speed shot peening. Background technique [0002] Additive manufacturing technology, also known as 3D printing technology, is a rapid prototyping technology emerging in the 1990s, which uses the accumulation principle to manufacture metal materials. Additive manufacturing technology has nearly ten different technologies according to different materials. Selective Laser Sintering (SLS) and Direct Metal Laser Sintering (DMLS) are commonly used in China. Among them, the SLS technology uses powder to form under laser irradiation, and the control system controls the stacking and forming. The steps are: first, use the powder spreading roller to spread the material powder, and then use the metal powder preheater to preheat the material powder to close to the melting point. Then use a selecti...

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Problems solved by technology

The existing metal 3D printing technology generally uses powders ranging from tens of microns to hundreds of microns, which are discontinuous and unstable due to the long-term periodic and severe heating and cooling of high-energy beams, as well as the transformation of process parameters, external environment, and scanning path. Factors lead to deformation, cracking, holes, inclusions, cracks and other problems in the formed parts. In addition, due to the rapid cold and hot processing of the metal powder, the formed parts cannot meet the use standards in terms of dimensional accuracy and internal organization. , which will greatly increase the printing cost

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