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随着现代航空与宇航技术的发展,大型薄壁铝、镁合金砂型铸件的应用日益增多。这类铸件的特点是尺寸大,壁厚小,结构复杂。在浇注过程中,往往在型腔未完全充满之前,金属液就失去了流动性,因而造成冷隔与欠铸。为此,解决成型质量问题就成为铸造大型薄壁铸件的一项重要课题。通常是采用提高合金浇注温度的办法,来满足薄壁铸件的成型需要。但是在某些情况下,这种办法并不能彻底解决薄壁铸件的
With the development of modern aviation and aerospace technology, the application of large-scale thin-wall aluminum and magnesium alloy sand castings is increasing day by day. This type of casting is characterized by large size, small wall thickness, complex structure. In the casting process, often in the cavity is not fully filled, the liquid loss of liquidity, resulting in cold and undercasting. For this reason, to solve the problem of forming quality has become an important issue casting large thin-walled castings. Usually used to raise the temperature of the alloy pouring method to meet the molding needs of thin-walled castings. But in some cases, this approach does not completely solve the problem of thin-walled castings