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图1所示的零件为我厂承担的某一大型工程项目中的一只大型立柱。材料为一级铸铁(HT20一40),硬度HB=170一242。其主要技术条件如图1(b)所示。
The part shown in Figure 1 is a large column in a large-scale project undertaken by our factory. Materials for a cast iron (HT20 a 40), hardness HB = 170 a 242. The main technical conditions shown in Figure 1 (b) below.