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一、概述我公司生产的大型精密光学仪器的铸铁件,具有以下特点:薄壁件很多、结构复杂、壁厚相差悬殊,最薄者4毫米,最厚者达60～70毫米,甚至在同一铸件中,壁厚相差有达10倍以上者,特别是各种具有导轨面的底座、工作台类铸件要求强度高、稳定性好,导轨面之硬度更需严格控制,有的要求加工后在HB200～220的范围内、加工光洁度在▽10以上,致密度的要求是用放大镜观察,无缩松缺陷,批量小、品种繁多。这些要求给铸造生产带来了很多困
I. Overview The cast iron parts of the large-scale precision optical instruments produced by our company have the following characteristics: many thin-walled parts, complicated structures and great differences in wall thickness, the thinnest is 4mm and the thickest is 60-70mm, even at the same Castings, the wall thickness difference of up to 10 times more, especially with a variety of rail surface base, table castings require high strength, good stability, the hardness of the guide rail surface should be more strictly controlled, and some require processing after HB200 ~ 220 in the range, processing finish in ▽ 10 or more, the density of the request is to use magnifying glass observation, no shrinkage defects, small batch, variety. These requirements have brought a lot of difficulties to the casting production