Metal 3D printing is a 3D printing technology that uses metal powder to directly print metal parts, also known as metal powder sintering (SLM).
The current mainstream metal 3D printing technologies are: laser selective melting technology, laser cladding forming technology, electron beam selective melting technology, electron beam fuse deposition forming technology, inkjet bonding forming technology, additive and subtractive composite metal printing technology, plasma metal Printing, arc 3D printing technology, metal droplet jet forming technology.
During printing, the scraper spreads a layer of metal powder on the base plate of the forming cylinder, and the laser beam will selectively melt the powder according to the cross-sectional contour of each layer of the part to process the current layer. After the sintering of one layer is completed, the lifting system lowers the height of one section layer, and the powder spreading roller spreads another layer of metal powder on the formed section layer, and sinters the next layer.
The entire forming process is carried out in a processing chamber that is evacuated or filled with protective gas to avoid the metal reacting with other gases at high temperatures.
At present, the printing layer thickness of metal 3D printing is generally 0.04-0.10mm, with high precision; the density of sintered metal parts can reach 99% of the density of cast metal parts, and the strength is good; the printing cycle is 5-7 days, and the cycle is short.