A metal 3D printer airtight chamber atmosphere deoxygenation and circulation purification method and equipment

Abstract

The invention discloses a metal 3D printer airtight chamber atmosphere deoxygenation and circulation purification method and equipment. The two ends of the molding chamber are respectively provided with an air inlet and an outlet, and the inlet and outlet are connected through a gas circulation pipeline; the gas circulation pipeline is provided with There are a first pneumatic butterfly valve, a dust purifier, a second pneumatic butterfly valve, and a dewatering dryer; a branch pipeline is provided on the gas circulation pipeline between the second pneumatic butterfly valve and the dewatering dryer, and the end of the branch pipeline is It is connected with a vacuum pump, molecular sieves and vacuum pipeline solenoid valves are installed on the branch pipeline; the molding chamber is connected with an inert gas source. The present invention can reduce the oxygen content in the molding chamber to the required range before processing, start the gas cycle purification during the processing, and maintain the purity of the gas in the molding chamber; introduce pressure detection and oxygen content detection, so that the oxygen content and oxygen content can be obtained during the processing. The pressure is always within a reasonable range. It improves the molding efficiency and quality of the 3D printer, and ensures the safety and reliability of the processing process.

Description

technical field [0001] The present invention relates to selective laser melting processing molding equipment, in particular to a metal 3D printer airtight chamber atmosphere deoxygenation and circulation purification method and equipment. 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...

AI Technical Summary

Problems solved by technology

With the accumulation of black smoke, part of the black smoke will fall off during the next processing, part of it will fall on the powder to pollute the powder, and part of it will fall on the molding surface and affect the processing quality

The black smoke adhering to the side of the observation window will seriously affect the monitoring of the processing process

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