大中型的铸铁件,在砂型的表面,必须上一层含有石墨的耐高温塗料。为了防止铸钢件粘砂,则多采用高级石英砂;对于厚大的铸钢件还须在砂型表面上一层石英粉糖浆塗料。这种防止铸件粘砂的办法,虽然是长期以来所惯用的,但仍有很多铸件发生粘砂,特别是厚大的铸件,如轧钢机的牌坊、机架等。 Large and medium-sized cast iron parts, in the sand surface, must be a layer of graphite-containing high temperature coatings. In order to prevent steel casting sticky sand, the more use of advanced quartz sand; for large castings must also be a layer of quartz sand powder coating on the surface of the syrup. This method of preventing the sticking of castings, although it has been used for a long time, still has a lot of sticky sand casting occurs, especially the thick castings, such as rolling mill torii, racks and so on.