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辅助材料神溪铸钟采用干模法,所用辅助材料一般取山坡上风沙沉积而成的黄土。土分生土和熟土2种,熟土即旧模打碎后再次利用的土。熟土经过高温烘烤,黏性较差,但透气性好;生土即从山坡上取回来的新土。内模一般用2/3以上的熟土,外模用1/3的熟土。模的透气性主要通过泥中的水分调节,水分多,干燥之后的模型透气性就好,反之就不好。钟越大,对透气性的要求越高,内模所需的水分就更大。如果模的透气性较差,浇注铁水时,容易导致铁水连续冒泡。
Auxiliary materials Shenxi casting bell mold method, the auxiliary materials generally take the hillside sediment deposition from the loess. Soil and native soil 2 kinds of mature soil, cooked soil that is broken after the old mold soil reuse. Cooked soil baked at high temperature, poor viscosity, but good air permeability; raw soil that is taken from the hillside to the new soil. Internal mold generally used more than 2/3 of cooked soil, the outer mold with 1/3 of cooked soil. The permeability of the mold is mainly adjusted by the moisture in the mud, the water is more and the breathability of the model after drying is better, on the contrary it is not good. The larger the bell, the higher the requirement for breathability, the greater the moisture required for the inner mold. If the modulus of poor ventilation, pouring hot metal, easily lead to continuous bubbling hot metal.