Multi-laser high-precision 3D printer and printing method thereof

Abstract

The invention discloses a multi-laser high-precision 3D printer and a printing method thereof. The printer comprises a power distributing module, a sintering platform and a laser sintering module. Thelaser sintering module comprises a preheating scanning module, a sintering scanning module and a trimming scanning module, wherein the preheating scanning module comprises a preheating laser for emitting a preheating laser beam and a preheating conducting assembly for conducting the preheating laser beam to the sintering platform, the sintering scanning module comprises a sintering laser for emitting a sintering laser beam and a sintering conducting assembly for conducting the sintering laser beam to the sintering platform, the trimming scanning module comprises a fine trimming laser for emitting a fine trimming laser beam and conducting the fine trimming laser beam to the sintering platform, and the temperature of the preheating laser beam is lower than that of the sintering laser beam.By sintering and processing powder by laser beams in a combined manner, the quality and precision of a formed part are improved from multiple aspects.

Description

technical field [0001] The invention relates to 3D printing equipment, in particular to a multi-laser high-precision 3D printer and a printing method thereof. Background technique [0002] Laser sintering printers use lasers to heat and melt materials, and then accumulate them layer by layer until they form a complete component. However, because the traditional 3D printer laser source device still has many deficiencies, it restricts the development of 3D printers towards higher quality and progress, thereby affecting the quality of molded products. [0003] In the existing 3D printers, only one laser source is usually set as the energy input device. Since the metal powder is not preheated, when the laser spot irradiates the metal powder, a huge temperature gradient is generated inside and outside the spot, that is, the inside and outside The large temperature difference causes large residual stress inside the 3D printed parts, which may lead to cracking, warping and spheroi...

AI Technical Summary

Problems solved by technology

However, because the traditional 3D printer laser source device still has many deficiencies, it restricts the development of 3D printers in the direction of higher quality and progress, thus affecting the quality of molded products

[0003] In the existing 3D printers, only one laser source is often set as the energy input device. Since the metal powder is not preheated, when the laser spot irradiates the metal powder, a huge temperature gradient is generated inside and outside the spot, that is, inside and outside The large temperature difference causes large residual stress inside the 3D printed parts, which may lead to cracking, warping and spheroidization of the molded parts, resulting in low geometric accuracy and large surface roughness of the molded parts. Therefore, Often requires later machining and surface treatment

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