Device and method for stabilizing air pressure in sealed molding chamber for 3D printing of metal

Abstract

The invention discloses a device and method for stabilizing air pressure in a sealed molding chamber for 3D printing of metal. The device mainly comprises an oxygen content detecting device for detecting the content of oxygen in the molding chamber, a vacuumizing device for the molding chamber and a pressure sensing device for detecting air pressure in the molding chamber; and the oxygen content detecting device, the vacuumizing device and the pressure sensing device are controlled by the control device, and a way of simultaneously introducing inert gases into the molding chamber and vacuumizing is adopted, so that the content of oxygen in the molding chamber is kept to be reduced, and the air pressure is kept stable. Therefore, the stability and quality of an equipment molding process can be greatly improved, and the safety and reliability of a processing course can be ensured. The device and technical means of the method are simple, convenient and easy; the molding chamber works at positive pressure, so that oxygen in the atmosphere can be kept difficult to enter the sealed molding chamber; in addition, dust cannot be easily raised in the 3D printing process of the metal.

Description

technical field [0001] The invention relates to the field of selective laser melting processing, in particular to a device and method for stabilizing air pressure in a metal 3D printing sealing molding chamber. 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, due to the changes in the internal temperature of the forming chamber and the pressure of the inert gas supply, the air pressure in the forming chamber is unstable, which easily causes the instability of the air flow, resulting in floating metal powder and gas in the forming process. The generated black smoke is disordered in the molding chamber and cannot be discharged normally outside the molding chamber. In addition, the interaction between the laser and the powder produces vaporized products, which may also lead to unstable air pressure in the...

AI Technical Summary

Problems solved by technology

It solves the problem that during the processing of existing 3D printers, due to the unstable air pressure in the molding chamber 4, the floating metal powder and the black smoke generated in the molding process are disordered in the molding chamber, resulting in poor quality of metal moldings and the laser lens and laser lens. Defects such as pollution caused by the inner wall of the molding chamber

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