Brush coating and dressing precision casting process: the purpose of the paint brush in sand mold cavity surface and dressing is to prevent surface adhering sand casting.Coating before use, must mix, because the paint is a kind of suspension, easy to produce precipitation;If need to the cavity surface coating for many times, the first layer coating concentration should be slightly larger, brush with Man knife light type surface, after the last use a thin layer of paint coating, in addition to outside the cavity surface should be to brush paint, the parting surface, cavity junction, poured riser system, such as the core and core, also should brush the appropriate coating layer.
f steel, such as in pig iron carburization, feeding carefully, or the accounting, will bring into harmful elements.4, lost wax casting molten steel overheating and severe heat treatment operation wrong, coarse grains.