Blowing device of metal 3D printer

Abstract

The invention belongs to the technical field of 3D printing, and relates to a blowing device of a metal 3D printer. The blowing device comprises a shell, and an air inlet and an air outlet are formedin the shell; an airflow channel is formed in the shell; the airflow channel comprises N layers of flow channels which are sequentially superimposed from top to bottom, wherein N is greater than or equal to two; the air inlet communicates with the air outlet through the airflow channel; a baffle with the height of h is arranged between the lower edge of the air outlet and the lower edge of the shell; a bottom-layer flow channel outlet is formed in the baffle, and the flow channel at the bottommost layer in the airflow channel communicates with the bottom-layer flow channel outlet; the distancebetween the lower edge of the bottom-layer flow channel outlet and the lower edge of the shell is h1, wherein h1 is less than h. According to the blowing device of the metal 3D printer, vortexes at ashielding gas outlet can be effectively reduced, the laminarity of shielding gas on the surface of a powder bed can be obviously improved, and the quality of the forming surface in the printing process is ensured.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a blowing device, in particular to a metal 3D printer blowing device. Background technique [0002] Metal 3D printing is a metal rapid prototyping technology. It is a technology that uses powdered metal to construct three-dimensional objects through laser selective sintering. It is a manufacturing method that adds and selectively solidifies metal material powder layer by layer in the molding room. In its molding chamber, there is a shielding gas inlet on one side and a shielding gas outlet on the other. Oxidation of the surface is avoided by the applied shielding gas forming a laminar shielding gas flow above the forming area. [0003] see figure 1 as well as figure 2 , is a structural schematic diagram of a blowing device used in a 3D printer in the prior art and a schematic cross-sectional flow channel diagram of the blowing device. The blowing device includes a housing,...

AI Technical Summary

Problems solved by technology

This structure will have the following problems: 1) After the gas enters the airflow channel through the air inlet, since there is a baffle with a height h between the air outlet of the airflow channel and the bottom of the housing, the gas will flow into the molding chamber from the air outlet of the airflow channel. homogeneity and swirl (see image 3 ), the generation of eddy current or whether it is strong or not will weaken the laminar flow of the protective gas on the surface of the powder bed and affect the quality of the molding surface during the printing process

2) Due to the angle between the air inlet and the direction of the incoming flow, the flow resistance of the incoming flow through the air inlet is increased, and when it passes through the airflow channel and is discharged from the air outlet of the airflow channel, the uniformity and laminar flow of the fluid are difficult to guarantee

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