Powder spreading device for SLM type metal 3D printer

Abstract

The invention discloses a powder spreading device for an SLM type metal 3D printer. The device comprises a powder spreading mechanism and a powder spreading driving mechanism, wherein the powder spreading mechanism is arranged on a bottom plate of a forming chamber, and the powder spreading driving mechanism is used for driving the powder spreading mechanism to move so as to lay metal powder in aforming cylinder of the forming chamber, wherein the powder spreading mechanism comprises a cantilever, a scraping plate and a scraping piece; and the scraping plate and the scraping piece are arranged in parallel, the scraping plate is parallel to the length direction of the scraping piece, and the bottom of the scraping piece is steel sheet strips which are densely arranged; the powder spreadingmechanism further comprises a first adjusting mechanism and a second adjusting mechanism, wherein the first adjusting mechanism is used for adjusting the height of the scraping plate, and the secondadjusting mechanism is used for adjusting the height of the scraping piece. According to the powder spreading device, metal powder with poor quality can be laid, hard collision between the scraping plate and impurities in the metal powder can be prevented in the powder spreading process, and therefore the scraping plate is protected.

Description

technical field [0001] The invention relates to a printer, in particular to a powder spreading device for an SLM type metal 3D printer. Background technique [0002] 3D printing technology is a technology that accumulates materials layer by layer to manufacture solid parts. Compared with traditional material removal technology, it does not require tools and molds, and does not require multi-process processing. The production cycle is short and complex structures can be easily processed. parts. [0003] The current 3D printing technology can be roughly divided into SLS (Selective Laser Sintering), SLM (Selective Laser Melting), FDM (Fused Deposition Modeling), SLA (Stereolithography), and EBM (Electron Beam Jet Molding). [0004] SLM technology uses high-energy laser beams to irradiate metal powder to make it melt quickly and cool and solidify into shape. It can use single metal or mixed metal powder to directly manufacture metal parts with a density close to 100%. The proce...

AI Technical Summary

Problems solved by technology

[0007] However, during the working process of the powder feeding and spreading device of the above-mentioned SLM type 3D printer, because some parts have relatively low precision requirements, some metal powders of poor quality will be used during printing. These metal powders are not high in purity and contain large and hard During the powder laying process, the scraper is prone to hard impact with the impurities. First, it will cause pits and ravines in the powder layer, which will seriously affect the quality of the powder. Second, it will cause damage to the scraper.

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