Annular powder-spreading selective laser melting forming device

Abstract

The invention discloses an annular powder-spreading selective laser melting forming device. An annular structure that an annular forming bin is formed by the inner wall and the outer wall is adopted,an annular piston is arranged in an annular forming bin of an annular forming cylinder; the annular piston is connected to a piston rod of a piston electric cylinder which is fixed to the lower end ofthe annular forming cylinder; and the annular forming cylinder is provided with a powder feeder and a scraper which can annularly slide in the annular forming bin. The scraper is driven by a scraperdriving device to achieve powder spreading and forming in the annular forming bin; when the annular forming cylinder structure is matched with a powder-spreading structure, powder is simply spread inan annular printing face without powder spreading in the central area of the forming face; the powder consumption is greatly reduced; and powder pollution is reduced. In the annular powder spreading process, an optical circuit system can scan the area in which the powder has been spread; printing is conducted while powder spreading; the inefficient movement that a layer of powder is spread beforeprinting in a traditional powder spreading way is avoided; and the printing efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an annular powder-spreading laser selective-area melting forming device. Background technique [0002] Additive manufacturing, commonly known as 3D printing, combines computer-aided design and material processing and forming technologies. Based on digital model files, it uses software and numerical control systems to accumulate various materials layer by layer through extrusion, sintering, melting, light curing, spraying, etc., and finally manufactures physical objects. Compared with the traditional processing mode of cutting and assembling raw materials, additive manufacturing is a "bottom-up" material accumulation manufacturing method, which makes it possible to manufacture complex structural parts that cannot be realized due to the constraints of traditional manufacturing methods. 3D printing is an advanced manufacturing technology, which provides a...

AI Technical Summary

Problems solved by technology

[0004] However, for some ring parts, SLM technology has a large cavity in the center of the part.

The traditional powder spreading method needs to spread powder evenly throughout the forming cavity, which greatly increases the amount of powder used, reduces the efficiency of powder spreading, and increases the waste of powder and the cost of recycling.

At the same time, the traditional powder spreading method needs to spread a layer of powder and then print another layer. The speed of powder spreading seriously affects the printing efficiency, and it is impossible to print while spreading powder.

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