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主梁、横梁、前梁中部这三个大型零件均为30CrMnSiNiA材料,热处理强度σ_b=170公斤/毫米~2(相当于洛氏硬度Rc47～50.5),热处理后机械加工比较困难,因此,三大件除孔和耳片以外,其余部份都已在热处理前加工到最后尺寸。就是说热处理变形不允许超过规定范围。可是,长期以来,这三个大件热处理变形比较严重,影响了产品质量。 一九七五年三月厂革委会向我车间下达
The three large parts of the main beam, the crossbeam and the middle of the front beam are 30CrMnSiNiA materials, the heat treatment strength is σ_b = 170 kg / mm 2 (equivalent to Rockwell hardness Rc 47-50.5), and the mechanical processing after the heat treatment is relatively difficult. Therefore, In addition to the hole and the ear pieces, the rest have been processed to the final heat treatment before the size. In other words, heat treatment deformation is not allowed to exceed the specified range. However, a long time, these three large heat treatment deformation is more serious, affecting product quality. In March 1975, the Revolutionary Committee issued to my workshop