Selective Electron Beam Melting (SEBM) is an additive manufacturing technology that uses high-energy electron beams as energy source to manufacture solid components in a high vacuum environment by melting metal powders layer by layer. The principle is that the electron beam quickly scans and melts the pre-laid spherical metal powders on the bottom plate according to the planned path. After completing a layer of scanning and melting, the workbench descends to a certain height and a new powder layer is laid. The electron beam scans and melts again according to the planned path, and this pro cess is repeated layer by layer, so that completing the manufacturing of metal parts from 2D to 3D.