The whole process device consists of powder cylinder and forming cylinder. When the powder cylinder piston (powder feeding piston) rises, the powder roll evenly lays the powder on the forming cylinder piston (working piston). According to the slice model of the prototype, the computer controls the two-dimensional scanning trajectory of the laser beam and selectively sinters the solid powder material to form a part layer. After one layer of powder is finished, the working piston drops one layer thickness and the powder spreading system is coated with new powder. Control laser beam scanning and sintering new layer. So cycle back and forth, layer upon layer, until the three-dimensional parts are formed. Finally, the sintered powder is recycled into the powder cylinder and the moulding parts are taken out. For metal powder laser sintering, before sintering, the whole table is heated to a certain temperature, which can reduce the thermal deformation in forming and facilitate the combination of layers and layers.
In the technology of 3D_printer, metal powder SLS technology is a hotspot in recent years. It is difficult to produce high strength parts by traditional cutting methods, and it is of great significance for the wider application of rapid prototyping technology. Looking forward to the future, the research direction of SLS-shaped technology in the field of metal materials should be sintering of unit system metal parts, sintering of multi-element alloy parts, laser sintering of advanced metal materials such as metal nano-materials, amorphous metal alloys, etc., especially suitable for the forming of micro-components of cemented carbide materials. In addition, parts with functional gradient and structural gradient are sintered according to their specific functions and economic requirements.