Vanishing mold casting (also known as solid casting) is the casting size and shape of similar paraffin or foam model bonding combination into a model cluster, brush refractory coating and baked hundred dry, buried in dry quartz sand vibration modeling, pouring under negative pressure, so that the mold degree type vaporization, liquid metal occupies the model position, solidification and cooling to form a new casting method. Simply put is the foam mold sample burning disappeared, so called disappearing mold casting, now is generally used EPS foam as a mold sample asked.
V method casting is to open a large number of permeable holes aluminum mold sample on a hollow plate, when the vacuum action, so that the plastic film cling to the mold sample; will be a large stretch rate, plastic deformation rate of plastic film answer with a heater to heat softening, heating temperature is generally 80 ~ 120 ℃; in 200 ~ 400 mmHg of vacuum suction, so that the film cling to the surface of the model; spray paint and drying, the special After spraying paint and drying, put the special sand box on the model covered with film; add dry sand with good filling efficiency and 100-200 mesh size into the sand box, and then carry out micro-vibration to make the sand compact to a high density. Open the sprue cup, scrape the surface of sand layer and cover with plastic film to close the sand box. The sand box is vacuumed and the film covered on the surface of the sand box is used to harden the mold under the action of atmospheric pressure. When the mold is started, the vacuum of the negative pressure box is released to release the adsorption force of the thin film on the template, and then the top box is started to complete a mold, and the box is closed and poured, and the sand is removed from the box.
