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一、前言 铸造石膏型可分为熔模石膏与拔模石膏型。熔模石膏型利用石膏混合浆料代替涂挂材料,一次浇灌蜡型获得铸型;拔模石膏型是用石膏混合浆料代替型砂等造型材料,将其浇灌在砂箱内模样上,经凝固硬化得到铸型,其生产工艺简单,有较大灵活性,主要用于模具生产。在拔模石膏型中按其使用状态可分为发泡石膏型和非发泡石膏型,发泡石膏型具有一定的强度,较好的透气性,在大气压力下可得到表面光洁,尺寸精确的良好铝合金铸件。
I. Introduction Casting gypsum casting mold can be divided into cast and cast plaster type. Casting gypsum type gypsum mixed slurry instead of coating material, a wax-casting mold; cast gypsum type is the gypsum mixed slurry instead of molding sand and other modeling materials, which are poured into the sand box on the model, the solidification Hardened get the mold, the production process is simple, greater flexibility, mainly for mold production. In the cast gypsum type can be divided according to their use state foam gypsum-based and non-foam gypsum type, foam gypsum-type has a certain strength, good breathability, at atmospheric pressure can be smooth surface, the size is accurate Good aluminum alloy castings.