Device for entering and exiting of shielding gas on two sides of forming bin of metal 3D printing equipment

Abstract

The invention provides a device for entering and exiting of shielding gas on two sides of a forming bin of metal 3D printing equipment. Gas exiting and entering devices for working bins in metal selective forming equipment are generally simple pore channel devices or rectangular devices, have common problems that gas flow produced at a gas inlet in a laser sintering process for powder cannot blow away black smoke and metal vapor plasma produced under mutual action of laser and powder, and then larger power loss of laser and irregular shape of a weld pool are caused and result in severe influence on forming quality and forming precision of formed parts, or have the problem that powder sintering black smoke close to the gas inlet and is blown to be scattered on a powder layer close to a gas outlet and printing work is affected. The specific device is mainly designed to enable gas flow to form stable laminar flow and effectively blow away the black smoke and metal vapor plasma produced during laser sintering of the powder, the laser energy utilization rate can be increased by about 10%-15%, the quality and the precision of the formed parts can be improved effectively, and the density of the formed parts approaches 100%.

Description

technical field [0001] The invention relates to a device for protecting gas in and out of the forming chamber of metal 3D printing equipment, which mainly solves the problem of serious loss of laser caused by black smoke and metal plasma generated during laser sintering powder in the process of selective laser melting and forming, so that it can Improve the utilization rate of laser energy by about 10%-15%, and effectively improve the quality and precision of molded parts, making the density of molded parts close to 100%. Background technique [0002] Today's market environment is undergoing tremendous changes. On the one hand, consumers' needs are increasingly personalized and diversified; on the other hand, product manufacturers are all focusing on the fierce competition in the global market. Faced with such a rapidly changing and unpredictable buyer's market, manufacturers must not only quickly design products that meet people's consumption needs, but also produce them qu...

AI Technical Summary

Problems solved by technology

Problem 1: During the molding process, because the laser sintering powder layer will generate a large amount of black smoke and metal vapor plasma, resulting in a large attenuation of laser power, resulting in poor quality of molded parts, poor dimensional accuracy, etc.

Some even directly affect the quality of single-layer powder melting, making it difficult to continue the printing process

[0006] Question 2: Even if the protective gas is enough to blow away the black smoke and metal vapor plasma during the molding process without affecting the power of the laser, but because some equipment has a relatively large printing format, in order to avoid excessive stress on the entire surface during laser scanning, you will generally choose Diagonal scanning or checkerboard scanning, at this time, the black smoke and large particles near the air outlet will be blown and scattered on the surface of the workpiece near the air suction port, thus affecting the powder spreading and sintering quality of the next layer

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