Powder quantitative supply device for selective laser melting 3D printing

Abstract

The invention discloses a powder quantitative supply device for selective laser melting 3D printing. The powder quantitative supply device comprises a powder supply mechanism, a powder discharging mechanism which is fixed on the lower part of the powder supply mechanism and a control system; the powder discharging mechanism comprises a powder discharging box body, a powder discharging shaft and apowder discharging motor; the powder discharging box body comprises a first box body, wherein a powder inlet communicating with the powder supply mechanism is formed in the top part of the first box body, and a powder outlet is formed in the bottom part of the first box body; the powder discharging shaft comprises a powder discharging shaft main body and a powder discharging shaft end part, and the powder discharging shaft main body is provided with a single axial powder picking groove; the powder discharging shaft main body is rotatably arranged in the first box body, and divides the first box body into a top space and a bottom space which are isolated from each other; the powder discharging motor is arranged at one end of the powder discharging box body, and an output shaft of the powderdischarging motor is in driving connection with the powder discharging shaft end part; and the control system is electrically connected with the powder discharging motor. Compared with a spline shaftin the prior art, the powder discharging shaft with the single groove has the advantages of being simple in appearance and low in manufacturing requirement.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a powder quantitative supply device for laser selective melting 3D printing. Background technique [0002] With the development of science and technology, there are various methods for 3D printing of metal parts, among which laser selective melting is a commonly used 3D printing method. Laser selective melting technology needs to completely melt the metal powder in the selected area during the forming process. Therefore, it is necessary to spread the metal powder on the printing substrate on the forming lift table before the laser beam of the high-power density laser starts scanning, and then the laser beam will According to the outline information of the current layer, the powder on the substrate is selectively melted to process the outline of the current layer, and then the forming lifting table is lowered by a layer thickness, and then the metal powder is spread on the processed cur...

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Problems solved by technology

[0003] The powder supply device in the prior art usually realizes the powder supply through a spline shaft rotating in the powder discharge box, and a plurality of key grooves are distributed on the circumferential surface of the spline shaft, but the shape of the spline shaft is complex and difficult to manufacture. The requirements and manufacturing costs are relatively high; secondly, it is difficult to accurately control the powder supply volume of this multi-groove spline shaft, and it is also impossible to precisely adjust the powder supply volume; thirdly, if the spline shaft and the inner wall of the powder discharge box If the fit is too tight, the spline shaft is easily stuck and cannot rotate smoothly. If the fit gap between the spline shaft and the funnel is too large, the powder is prone to leakage, which makes the design of the fit gap between the spline shaft and the powder discharge box particularly difficult. , which increases the difficulty of design and manufacture; in addition, the powder supplied by the traditional quantitative powder supply device must maintain particularly good fluidity, otherwise the powder is easy to agglomerate and cannot be released under the action of gravity, which limits the types of 3D printing powder for metal parts choose

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