3D modeling apparatus, 3D modeling apparatus control method, and 3D modeling apparatus control program

摘要

Prevent excessive evaporation of the powder. A three-dimensional modeling apparatus, which is provided between an electron gun for generating an electron beam, one or more stage deflectors for deflecting the electron beam one-dimensionally or two-dimensionally, and the electron gun and the deflector. And at least one lens for focusing the electron beam, and control means for controlling the direction of deflection by the deflector and the speed of scanning, wherein the deflector scans and irradiates a predetermined area, and the electron A control means for controlling the cross-sectional diameter of the beam; the step of melting the powder is divided into two steps, and the two steps are defined as a first and a second melting step in the order of the steps; The powder is supplied with heat per unit area necessary for the temperature increase from the preheating temperature to the melting point of the powder at each point, and in the second melting step, the powder is melted into the powder. Melt under heat In the second melting step, the powder is applied in the second melting step by applying a heat per unit area that is greater than the heat required per unit area to increase the cross-sectional diameter of the beam. The electric power per unit area of the electron beam given to is made smaller than the electric power per unit area of the electron beam given to the powder in the first melting step.