The process flow of lost foam casting is divided into two parts: white area and black area.
(1) the process of lost foam casting white area: the white area is mainly a program for making foam models. Foam molding process should first consider the wall thickness and material of lost foam castings, and choose the foaming agent (original foaming beads) suitable for it. After finding the appropriate foaming beads, put the original beads into the intermittent hair dryer for foaming. When foaming, consider the process requirements, such as density, strength and other indicators. After drying in the curing bed of the pre hair machine, it is transported to the curing bin for curing. Then enter the molding workshop, inject the matured beads into the preform mold, expand and melt the beads after steam heating and humidification, and finally fill the mold cavity to form the shape of lost foam casting. Then, after cooling through the water cooling process, the foamed white mold has a certain strength. Then enter the drying room for drying, and the white mold is made.
（2) lost foam casting black area process flow: loast foam casting will place the special interlayer sand box on the vibrating equipment table, and then lay dry quartz sand with a thickness of about 100mm at the bottom of the box (the particle size of quartz sand is about 20-40 mesh), and then vibrate the quartz sand in the box through the vibrating equipment, and scrape the top of the box at the same time. Then, the Yellow model made in the white area is pre placed on the sand surface at the bottom of the sand box, and the position of the Yellow model in the sand box is arranged according to the pre design. Then, the sprue reserved model used in casting is connected with the pouring riser, and then the sand box is filled with dry sand. Then the sand box is vibrated again according to the process requirements. After the sand in the sand box is vibrated, the dry quartz sand at the box mouth is scraped flat again. After scraping, cover the box mouth with plastic film, then place the gate cup at the gate, and fix the plastic film at the edge of the box with quartz sand. Then connect the hose of the vacuum system to the pipeline at the bottom of the box, start the equipment of the vacuum system for vacuum pumping, and fasten the dry sand in the box after reaching the specified time and process requirements, so that the mold process in the black mold area is completed. Wait for the metal solution to enter the Yellow mold cavity of the mold box through the gate cup, and then wait for the white mold gasification to disappear. The high-temperature metal solution quickly replaces the position of the white mold cavity and overflows out of the gate, and then the pouring procedure is completed. After the cooling process of the casting box is completed, the vacuum cooling process of the casting box shall be removed, and the casting shall disappear after the mold is turned over.