Method and device for impurity gas circulating purifying in low positive-pressure sealing forming room

A gas circulation and impurity gas technology, which is applied in chemical instruments and methods, separation methods, measuring devices, etc., can solve the problem that the sealing performance of the gas circulation purification device is not good enough, the metal dust cleaning and collection process is not convenient enough, and the SLM processing process is affected. Human health and other issues, to achieve the effect of reducing rapid accumulation and blocking, long service life, and improving filtration efficiency
CN106975278AActive Publication Date: 2017-07-25SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2017-07-25

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Abstract

The invention discloses a method and a device for impurity gas circulating purifying in a low positive-pressure sealing forming room. The device comprises a forming room and a gas circulating purifying system thereof, wherein the gas circulating purifying system is controlled by a computer; both ends of an inner cavity of the forming cavity are respectively provided with a gas circulating outlet A and a gas circulating inlet B; the gas circulating purifying system comprises a gas uniform distribution device, a filter box, an activated carbon filter box, a circulating gas pump, differential pressure sensors and the like which form a circulating gas path; two pressure guide ports of each of the differential pressure sensors are respectively connected with an outlet pipeline of the filter box, an inlet pipeline of the circulating gas pump, and an inlet pipeline of the uniform gas distribution device. The device has the advantages that the purifying efficiency is higher, the multiple indexes such as oxygen content, air pressure and concentration of metal dust particle in the environment of the forming room,, can be quickly adjusted, and the purifying degree on metal dust particles in the environment of the forming room is high.
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Description

technical field

[0001] The invention relates to the field of selective laser melting (Selective Laser Melting, SLM) additive manufacturing, and in particular to a method and device for circulating and purifying impurity gas in a low positive pressure sealing molding chamber. Background technique

[0002] With the development of Selective Laser Melting (SLM) technology, SLM has been able to directly manufacture metal parts with metallurgical bonding, compact structure, high dimensional accuracy and good mechanical properties, which can be formed in small batches, personalized, with complex surfaces and Metal parts with internal structures have broad application prospects and become a research hotspot in the field of additive manufacturing today.

[0003] It is very important to control the gas environment in the sealing molding room during SLM processing, and the key indicators are oxygen content, air pressure, and metal dust particle concentration. Among them, the oxygen co...

Claims

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