Shielding gas circulating filtration device for 3D printing metal powder bed forming cavity and optimization method of shielding gas circulating filtration device

A metal powder, 3D printing technology, applied in the improvement of process efficiency, additive manufacturing, additive processing, etc., can solve the problems of repeated pollution of filtered protective gas, long forming cycle of parts, blockage of air inlets, etc. The effect of avoiding powder sucking, reducing design and processing costs, and maintaining stability
CN106513674AActive Publication Date: 2017-03-22NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2017-03-22

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Abstract

The invention discloses a shielding gas circulating filtration device for a 3D printing metal powder bed forming cavity and an optimization method of the shielding gas circulating filtration device. According to the optimization method, the vertical movement distance z of processed smoke is adjusted and is not larger than the height h of an air suction flow guiding channel, and accordingly the purposes that the processed smoke is completely captured by the air suction flow guiding channel, and the pressure from an air inlet flow dividing port to an air suction flow guiding port in the forming cavity is gradually reduced are achieved; and a machined metal part has the beneficial effects of being good in surface quality, high in density, good in mechanical performance and the like.
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Description

technical field

[0001] The invention belongs to the technical field of 3D metal powder printing, and in particular relates to the improvement of a protective gas circulation filtering system for a metal powder bed forming cavity. Background technique

[0002] 3D printing technology based on metal powder bed technology can efficiently and cost-effectively produce complex metal functional integral parts with high precision because it is not limited by the complex shape of the part to the greatest extent. Due to the strong oxidizing properties of metals, the prepared parts are all completed in a sealed forming cavity filled with inert gas. However, when the high-energy laser interacts violently with the metal powder for a short time, the molten droplet has strong instability and is prone to droplet splashing and metal vaporization, especially when processing metals with extremely high physical and chemical activities, such as magnesium, aluminum and titanium. The generated smo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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