Process for quickly manufacturing electric power fittings based on 3D printing technology

The invention discloses a process for quickly manufacturing electric power fittings based on a 3D printing technology. Drawings of plastic fitting samples and printing procedures are built to form a 3D printing terminal database of plastic metal samples; plastic sample models are obtained through 3D printing; the plastic sample models are placed in a tightly vibrated sand box, are added with dry quartz sand, and are fixed by the dry quartz sand, and meanwhile, a vibration table is vibrated by preset time in the three-dimensional direction, so that the dry quartz sand is fully filled in all parts of the plastic sample models; and the sand box is moved out to a casting station, the surface of the sand box is sealed by a plastic film, the dry quartz sand is bonded by dint of the difference between the atmospheric pressure and the pressure in a casting mold inner shell, and molten metal is cast to generate the replacement process of liquid metal and the plastic sample models to finally form metal castings. The pr