Laser 3D printing equipment

Abstract

The invention relates to laser 3D printing equipment. The laser 3D printing equipment comprises a rack part, a forming part, a gas protection part, a laser scanning part, a powder laying part and a preheating part, wherein the forming part, the gas protection part, the laser scanning part and the powder laying part are fixed to the rack part, and the preheating part can pre-heat forming powder. The forming part is a relatively-sealed internal cavity defined by a plurality of parts fixed to the rack part; the gas protection part is arranged outside the rack part and circularly communicates withthe forming part; the laser scanning part is movably fixed along the outer side of the forming part; the preheating part is fixed to the other oppositely-arranged side of the forming part and fixed in the rack part in the mode of being capable of stretching out and drawing back; and the powder laying partially extends into the forming part internal cavity to be fixed. The problems that laser energy is wasted due to the fact that lasers are likely to diffuse or reflect in the forming process, and the yield of products is low due to the fact that the accumulating shape of the forming powder islikely to be changed because of uneven heating are effectively solved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a laser 3D printing device that uses a laser to melt / melt and accumulate powder layer by layer based on a scanning galvanometer. Background technique [0002] As a kind of additive manufacturing technology, laser 3D printing has high printing accuracy and printing speed. It has a wide range of materials and is suitable for the processing and molding of various metal or non-metal materials. Laser 3D printing is a technology that uses a three-dimensional solid model generated by CAD to directly produce parts. Its main principle is to use infrared lasers as energy sources. Most of the modeling materials used are powder materials. During processing, the powder is first preheated to a temperature slightly lower than The temperature of its melting point, and then the powder is paved under the action of the scraping stick; the laser beam is selectively sintered accordin...

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Problems solved by technology

[0011] In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a laser 3D printing equipment, which breaks through the limitation of the size of the internal station of the laser melting molding in the prior art, and solves the problems in the prior art. Laser focusing can only be locally heated, so that the pre-distributed molding powder is prone to change in the shape of the accumulation under the condition of uneven heating, which affects the shape of the final molded part, resulting in a problem of lower product yield. And it solves the problem that the traditional injection of protective gas tends to cause small-radius molding particles to adhere to the lens, which easily makes the laser diffuse or reflect, and weakens the energy of the laser.

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