型号研制任务的发展对铸件结构重量提出了更为苛刻的要求,为此,在进一步提高合金性能,改善铸件质量的同时,必须大力采用薄壁结构铝、镁合金铸件并为其付诸实现创造必要的工艺条件。由于这类铸件具有尺寸大、壁厚小、结构复杂等特点,因而给铸造成型带来很大困难,故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。从改变充型过程中金属液与铸型之间的热交换条件角度出发,在铸型表面熏涂乙炔 The development of model development tasks put more severe requirements on the weight of the castings. To further improve the properties of the alloys and improve the quality of the castings, the casting of thin-wall aluminum and magnesium alloys must be vigorously adopted and implemented Necessary process conditions. Due to its large size, small wall thickness and complicated structure, the castings of this type have great difficulties. Therefore, solving the problem of forming quality has become an important issue for casting large thin-walled castings. In view of changing the condition of heat exchange between the molten metal and the mold during filling, acetylene is sprayed on the surface of the mold