近年来随着我国雷达工业的发展,对Z1203、Z1302铝铸件的要求越来越高、表现在:外廓尺寸大,致密度要求高,壁厚悬殊,在0.2MPa压力下工作不漏气,加工后表面达6,不准有砂眼、缩孔、夹渣、冷隔等缺陷。 以前生产这种类型的铝铸件,在工艺上都是采用底注式的浇注系统,目的是使金属液充型平稳。但铸件在清理过程中发现局部缩松,经机加工后经常出现大面积密集性孔洞,无法满足使用要求,造成大批报废。 In recent years, with the development of China’s radar industry, Z1203, Z1302 aluminum casting higher and higher requirements, manifested in: large size, high density, wall thickness disparity, working under 0.2MPa pressure does not leak, After processing the surface of 6, are not allowed to have trachoma, shrinkage, slag, cold insulation and other defects. Previous production of this type of aluminum castings, the process is based on the use of bottom-pouring system, the purpose is to fill the metal liquid smooth. However, found in the casting process of partial shrinkage, often after the machining of large areas of dense holes, can not meet the requirements, resulting in a large number of scrapping.