Additive manufacturing device composite powder compacting and spreading device and method

Abstract

The invention discloses an additive manufacturing device composite powder compacting and spreading device and method. The powder spreading device comprises a pressure powder spreading machine and a vibration system, wherein the pressure powder spreading machine is provided with a coating surface with a certain inclined angle and used for spreading a powder material, and the vibration system is used for vibrating and compacting the spread powder material. According to the powder spreading device, due to the fact that the pressure powder spreading machine is provided with the coating surface with the certain inclined angle, in the powder spreading process, after loose powder enters the included angle formed between the coating surface and a powder spreading plane, the heated loose powder is mutually extruded through the gradually-decreasing space, and then gaps between the powder become smaller; the vibration system vibrates and pressurizes the extruded powder, distribution arrangement of the gaps between the extruded powder is stabilized, namely, rebound of the spread powder is reduced, the powder material is elastically deformed and then the flat-spread powder is compacted, so that compactness of three-dimensional forming products is improved, and mechanical performance of the three-dimensional forming products is further improved.

Description

technical field [0001] The invention belongs to the field of rapid prototyping manufacturing, and in particular relates to a composite compacting powder spreading device and method for additive manufacturing equipment. Background technique [0002] Rapid Prototyping (RP) is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Since the late 1980s, So far, it has become a pillar technology in modern advanced manufacturing technology. Selective Laser Sintering (SLS) is one of the fastest-growing rapid prototyping technologies in recent years. It uses powder materials as raw materials and uses laser to scan the cross-section of a three-dimensional entity layer by layer to complete prototype manufacturing. The complexity of the shape is limited, no tooling and molds are required, and the application range is wide. The basic proces...

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Problems solved by technology

[0003] In the above-mentioned prior art, the powder spreading device generally adopts a powder spreading roller or a scraper, although the existing powder spreading device can also realize the function of feeding and spreading powder, but because the laid powder is loose, that is, the powder particles The gap between the powder and the particles is relatively large, so the three-dimensional molded product manufactured from the loose powder has poor compactness, which ultimately affects the mechanical properties of the three-dimensional molded product

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