地坑造型是一种先进的造型方法,但是,由于地坑造型在烘干这道工序上还存在問題,所以沒有能普遍的推广。旧的烘干方法是在型腔上面燃燒木材和焦炭,这样不但浪費燃料,干燥的慢,同时砂型各部分干燥的不均匀。1955年我厂留苏实習的技术人員旧国后,介紹了苏联工厂中使用的一种活动烘干爐,解决了以上問题。 爐子的構造和使用:爐体是由4公厘厚的鋼板焊成,爐膛的內徑以500公厘左右比較合适。在鼓風口上方100～150公厘 Pit modeling is an advanced modeling method, however, due to pit modeling in the drying process there are still problems, so there is no universal promotion. The old drying method is to burn wood and coke on the cavity, so that not only the fuel is wasted but the drying is slow while the parts of the sand dry unevenly. After the old technical staff of our factory in 1955, who had been interning Soviet Union, introduced an active drying furnace used in the Soviet factory to solve the above problems. Construction and use of the furnace: The furnace is welded by 4 mm thick steel plate, the inner diameter of the furnace to 500 mm more appropriate. Above the tuyere 100 to 150 mm