长期以来,国内外熔模铸造采用氯化铵水溶液作为水玻璃型壳的硬化剂。这种方法虽然有很多优点,但在硬化过程中产生大量的氨气,对工人刺激性大,并使设备受到严重腐蚀。为了解决这个问题,我车间广大工人、技术人员在党支部的领导下,大搞科学试验,在学习上海兄弟厂先进经验的基础上,从去年11月扮开始用聚合氯化铝代替氯成铵作硬化剂。经过四个多 For a long time, investment casting at home and abroad using ammonium chloride aqueous solution as a water glass shell hardener. Although this method has many advantages, it produces large amounts of ammonia during the hardening process, irritates workers and severely corrodes the equipment. In order to solve this problem, under the leadership of the party branches, a large number of workers and technicians in our workshop vigorously conduct scientific experiments. On the basis of studying the advanced experience of Shanghai Brother Factory, starting from last November, they started to use PAC instead of chloroadenium For hardener. After more than four