Selective laser melting forming powder falling device

Abstract

The invention discloses a selective laser melting forming powder falling device. The device comprises a powder cylinder, a powder falling chamber, a quantitative powder falling shaft, a rhombic sliding block and a servo motor, wherein a cylindrical cavity is formed in the powder falling chamber; a powder inlet and a powder outlet are respectively formed in the upper surface and the lower surface of the powder falling chamber; the powder cylinder is arranged on the upper surface of the powder falling chamber and communicates with the powder inlet; the quantitative powder falling shaft is arranged in the cylindrical cavity of the powder falling chamber; two symmetrical outer circular arcs and circular arc grooves are arranged at the periphery of the middle part of the quantitative powder falling shaft and located at the powder inlet of the powder falling chamber; the rhombic sliding block is placed at the powder inlet of the powder falling chamber by virtue of self gravity; the lower part of the rhombic sliding block extends into the arc grooves; a gap is reserved between the outer circular arcs of the middle part of the quantitative powder falling shaft and the cylindrical cavity ofthe powder falling chamber; and the servo motor is used for driving the quantitative powder falling shaft to rotate. The device effectively avoids the powder leakage and the powder falling shaft blocking existing in powder falling in the process of laser selective melting forming; and quantitative powder falling is achieved, so that the powder utilization efficiency is increased.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to an area-selective laser melting forming powder dropping device. Background technique [0002] Additive manufacturing technology is a customized manufacturing based on the advantages of digitalization, distribution and simple process. Carry out three-dimensional CAD modeling of the parts by computer, and then layer and slice the model according to a certain thickness, complete the conversion of the three-dimensional information of the parts into a series of two-dimensional contour information, import the model layered files into the printer, and control the energy through the computer control system The source (laser or electron beam, etc.) acts on the powder or wire to realize the layer-by-layer accumulation of the parts. [0003] Selective Laser Melting (SLM), also known as Laser Powder Bed Fusion (LPBF), is a widely used method in metal additive manufacturing....

AI Technical Summary

Problems solved by technology

This leads to more stringent requirements on the material and particle size of the powder, especially for the falling powder of the refractory metal powder tungsten alloy, which will often cause jamming, resulting in the failure of the forming process.

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