Powder Spreading Device of Electron Beam Rapid Prototyping Machine

Abstract

The invention discloses a powder spreading device of an electron beam rapid prototyping machine. The powder spreading platform is located in the middle of a working room; the powder spreading device is movably placed on the upper surface of the powder spreading platform; It is fixed on the lower surface of the powder spreading platform; the lower part of the forming cylinder is provided with a forming surface lifting rod, and the forming surface lifting rod extends to the outside of the working room through a dynamic sealing structure; the difference is that it further includes a DC power supply; the DC power supply The positive output pole of the DC power supply is connected to the forming cylinder, the negative output pole of the DC power supply is connected to the wall of the working room and grounded; the forming cylinder and its lifting rod on the forming surface are electrically insulated from the wall of the working room. By pre-applying a positive potential to the forming cylinder of the electron beam rapid prototyping equipment, the accumulation of excess electrons on the surface of the metal powder particles scanned and formed by the electron beam can be neutralized; thus, the direct electrical connection between the forming cylinder and the working chamber wall can be overcome in the conventional forming process And grounding, resulting in collapse phenomenon.

Description

technical field [0001] The invention relates to the technical field of electron beam processing equipment, in particular to a powder spreading device of an electron beam rapid prototyping machine. Background technique [0002] Electron beam rapid prototyping technology is a newly developed technology, which uses the principle of metal powder melting under the bombardment of electron beams, and completes the processing of parts by layered scanning, which has high energy utilization rate and available Wide range of material sources and high forming speed advantages. During processing, the powder loading box sends the metal powder to the powder spreading platform, and the powder spreader spreads the powder on the powder spreading platform evenly to the forming surface of the forming cylinder. The electron beam emitted by the electron gun under the control of the computer is focused on the forming surface of the formed part, and selectively sintered according to the cross-secti...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing electron beam rapid prototyping machine powder spreading device has the problem that the metal powder particles collapse and affects the forming of the workpiece, and a powder spreading device for the electron beam rapid prototyping machine is provided

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