我厂铸钢车间主要为各发电厂生产备件用毛坯。砂芯最大直径为250mm,最小直径为18mm,原来采用水玻璃石英砂,但铸件在砂芯部位往往产生粘砂,给机加工带来困难。后来,我们采用水玻璃镁砂制芯,解决了铸孔粘砂缺陷,改善了出砂性。该工艺已使用7年,收到了满意的效果。 I plant mainly for the steel plant spare parts production plant with rough. Sand core maximum diameter of 250mm, the minimum diameter of 18mm, the original water glass quartz sand, but the casting parts in the sand core tend to produce sticky sand, machining difficulties. Later, we used water glass magnesia to make the core, which solved the sticky sand defects in the cast holes and improved the sand production. The process has been used for seven years and received satisfactory results.