Powder bed spreading device and powder bed additive manufacturing equipment

Abstract

The invention belongs to the technical field of 3D printing, and specifically relates to a powder bed spreading device and powder bed additive manufacturing equipment. The powder bed spreading device includes a powder spreading platform, which limits the powder spreading path; a powder return mechanism, which is arranged on the One side of the powder spreading platform; a powder feeding mechanism, which feeds powder from the other side of the powder spreading path, and contacts or leaves the powder returning mechanism in a horizontal movement; wherein, the powder returning mechanism and the powder returning mechanism The powder feeding mechanisms are all located on the powder spreading path. The powder bed additive manufacturing equipment includes the above powder bed powder spreading device. The invention provides a powder bed spreading device and a powder bed additive manufacturing equipment, which adopts a single-side powder feeding mode of bottom feeding, realizes the effect of double-side powder feeding, simplifies the equipment structure, and reduces costs.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a powder bed spreading device and powder bed additive manufacturing equipment. Background technique [0002] Using powder as raw material, the preparation technology of parts through selective deposition / sintering / melting process is a hotspot in the field of additive manufacturing at present. Typical powder bed additive manufacturing technologies include: Selective Laser Sintering (Selective Laser Sintering, SLS), Selective Laser Melting (Selective Laser Melting, SLM), Electron Beam Melting (Electron Beam Melting, EBM). The technological process of these technologies is similar: first, a layer of raw material powder is laid on the processing plane, and then the processing source divides the powder according to the cross-sectional shape of the part to form the cross-sectional profile of the part. For example, SLS / SLM technology uses lasers to sinter / melt powders f...

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Problems solved by technology

[0004] According to the powder feeding mode, the existing powder feeding device can be divided into upper powder feeding type and lower powder feeding type according to the position of the powder feeding mechanism. However, there is a problem that the remaining powder cannot be recycled after one-time powder delivery; although the two-way powder extrusion method of powder feeding on both sides can push the remaining powder to the front of the powder box on the opposite side, but this kind of extrusion The powder method powder will overflow to both sides of the powder spreading direction, the powder utilization rate is low and the initial powder demand is large; the powder feeding method of the single-side powder cylinder of the bottom powder feeding cannot realize the efficiency of double-side powder feeding, and the remaining powder It cannot be recycled and reused; the method of feeding powder on both sides can realize the effective recovery of powder after one-time spreading. Residual powder recovery during the powder feeding process, that is, after the powder pushed by one side of the powder tank completes the powder spreading in the forming area, the remaining powder can continue to be pushed to the opposite side of the powder tank. , continue to use the remaining returned powder, but there are problems such as complex device, increased volume of molding chamber and high cost

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