Gas cycle purification device for sealed shaping room

Abstract

The invention discloses a gas cycle purification device for a sealed shaping room. The gas cycle purification device comprises a shaping room, and also comprises a sealed box body, wherein a pre-filtering layer, a main filtering layer and a fan are arranged in the sealed box body from top to bottom; an air inlet is formed in the top of the sealed box body; an air outlet is formed in one side of the bottom of the sealed box body; the air inlet is connected with one end of the shaping room through a pipeline; and the air outlet is connected with the other end of the shaping room through a pipeline. According to the gas cycle purification device for the sealed shaping room, the sealing structure of the conventional product is improved, the smoke dust generated by processed metals in laser melting equipment shaping room in a selected area is subjected to gas purification, and the purified gas returns to the shaping room to protect the metal processing. The gas cycle purification device has the advantages of simple and feasible technical means, low cost, convenience in use and maintenance and the like.

Description

technical field [0001] The invention relates to an area-selective laser melting processing molding equipment, in particular to a gas circulation purification device for a sealed molding chamber. Background technique [0002] During the forming process of selective laser melting, it needs to be protected by high-purity nitrogen, argon and other inert gases. During the processing of metal powder after laser focusing, a large amount of smoke in the forming room greatly weakens the protective effect of nitrogen. At the same time, a large amount of smoke adheres to the metal powder, which will directly affect the absorption of laser energy on the surface of each layer of metal powder. And ultimately affect the quality of metal forming parts. Therefore, it is necessary to circulate and purify the gas in the molding chamber. [0003] SLM molding needs to completely melt the metal material, and the metal material will be oxidized when in contact with oxygen, or even burn (such as ...

AI Technical Summary

Problems solved by technology

[0005] First of all, a very serious consequence of the smoke is the pollution of the transparent lens, especially when scanning at low speed, the laser energy input is large, and the amount of smoke generated is also large, and the smoke quickly makes the transparent lens stick to a layer of black smoke powder. As a result, the power attenuation is serious when the laser passes through the lens, and the lens becomes hot and hot until it bursts

When the smoke pollutes the light-transmitting lens seriously, the power of the laser incident on the surface of the powder bed is insufficient, and the powder melting is insufficient. The molding process must be repeatedly shut down to manually remove the smoke on the light-transmitting lens. The molding efficiency and the quality of the molded parts have a great influence

In addition, after the smoke is generated, a small part is blown out of the powder bed by the protective gas, and most of it still falls to the surface of the unused powder bed and mixes with the powder, which aggravates the pollution of the powder

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