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

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.

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...

AI Technical Summary

Problems solved by technology

The "negative pressure" phenomenon will make the smoke and dust move towards the air inlet diverter port, causing the smoke and dust to accumulate at the air inlet and pollute the filtered protective gas for many times. In severe cases, it will cause the air inlet to be blocked or other mechanical interference phenomena.

[0005] Especially when using this technology to process large and complex metal components, the one-time forming cycle of the parts is very long, and the processing needs to be completed in one go, which will be a great challenge to the shielding gas circulation and filtration system

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