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我厂铸钢车间年产铸件4000 t,单件最大浇注重量为30 t,铸件最大壁厚达400mm。其中,一部分厚大铸件远销美国,其表面质量要求较高,为此,我们采用刚玉质造型材料来提高这些铸件的表面质量。刚玉质造型材料包括:棕刚玉型砂、铝矾土一棕刚玉粉复合涂料、刚玉质商品涂料。长期的生产实践证明,刚玉质造型材料具有优良的防粘砂性能,是一种用量少、效果好并能提高铸件表面质量的优质特种造型材料。现将我厂使用刚玉质造型材料的情况介绍如下。一.刚玉质原材料我们使用的刚玉质原材料主要有棕刚玉砂、棕刚玉粉和铝矾土粉。1.棕刚玉砂和棕刚玉粉棕刚玉砂(粉)的主要化学成分为Al_2O_3。它是以铝矾土为主要原料,在电弧炉内经高温(2000℃以上)熔炼后冷却得到的棕刚玉块,再通过破碎、
Casting plant annual output of 4000 tons of castings, casting a single maximum weight of 30 t, the maximum thickness of the casting up to 400mm. Among them, a large part of castings exported to the United States, its surface quality requirements are high, therefore, we use corundum modeling materials to improve the surface quality of these castings. Corundum modeling materials include: corundum sand, bauxite a corundum composite coating, corundum commodity coatings. Long-term production practice has proved that corundum modeling materials with excellent performance of anti-sticking sand, is a less dosage, good effect and can improve the quality of the casting surface casting special high quality materials. Now I plant corundum modeling materials introduced below. Corundum raw materials We use mainly corundum raw materials corundum, corundum and bauxite powder. 1. Brown corundum and corundum Brown corundum (powder) the main chemical composition of Al 2 O 3. It is bauxite as the main raw material, in the electric arc furnace after high temperature (above 2000 ℃) smelting after cooling corundum block, and then broken,