Mirroring

For single and large castings weighing several tons of slabs of carved model foam heated nichrome wire on templates or engraving-milling CNC machines. Then the polystyrene model of a fast drying paint is covered with a powder-refractory, glued together with foam runner, placed in a container, where it poured dry sand, and molten metal is poured through this gate. When you fill polystyrene evaporates ("lost foam") and the model is replaced with metal. When the metal solidifies in the form of castings in the fixed sand, which is assured by filling sand model (forming), took the form of Mirroring this casting. Produced by pouring metal fumes from the container suction pump – a vacuum support at about 0.5 atm, while vacuum seals it and keeps in stationary sand in the process of replacing models with metal. Then the gases through the chimney vacuum system serves for recycling and disposal system in the thermo-catalytic afterburning. There they are oxidized by about 98%, and in form of water vapor and carbon dioxide into the atmosphere outside the room shop. Traditional forms with a binder metal after pouring smoke into the room, no matter how ventilated work area shops, and the removal of gases from dry sand pump 10-12 times lowers indicators of air pollution department of the working area in comparison with traditional casting in sand molds in accordance with the measurements of concentrations of impurities in the air department. Modeling silica sand after removal of cooled casting from the mold because of its high turnover usually transported in a closed piping system pneumatic, excluding spray it in the shop.