Method and equipment of sealed chamber atmosphere deoxygenization and circulating purification for metal 3D printer

Abstract

The invention discloses a method and equipment of sealed chamber atmosphere deoxygenization and circulating purification for a metal 3D printer. A gas inlet and a gas outlet are respectively formed in two ends of a forming chamber; the gas inlet and the gas outlet are mutually connected through a gas circulating pipeline; a first pneumatic butterfly valve, a dust purifier, a second pneumatic butterfly valve and a water removal drier are arranged on the gas circulating pipeline; a branch pipeline is arranged on the gas circulating pipeline between the second pneumatic butterfly valve and the water removal drier; the tail end of the branch pipeline is connected with a vacuum pump; a molecular sieve and a vacuum pipeline solenoid valve are arranged on the branch pipeline; the forming chamber is connected with an inert gas source. According to the method, firstly the oxygen content in the forming chamber is reduced to a required range before machining, and gas circulating purification is started during machining, so that gas purity degree in the forming chamber is kept; pressure detection and oxygen content detection are introduced, so that the oxygen content and pressure are within a reasonable range at all time during machining. The method and the equipment improve the forming efficiency and quality of the 3D printer, and guarantee the safety and the reliability of the machining 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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