我厂铸造车间生产的解放型蒸汽机车汽室前盖有两种型号,如表1所示。两种不同型号的汽室前盖从外观和结构上看基本相似,轮廓尺寸都在470×280(毫米)的范围内。铸件壁厚最薄为10毫米,最厚为43毫米,材质为HT20—40。几年来,因工艺方 There are two types of steam room front cover for the liberation steam locomotive produced by our foundry workshop, as shown in Table 1. Two different types of vapor front cover from the appearance and structure are basically similar, the outline size is 470 × 280 (mm) in the range. Casting thinnest wall thickness of 10 mm, the thickness of 43 mm, made of HT20-40. In recent years, due to process side