C-80和C-100型推土机,经多年使用,后桥箱体合件(俗称大车架)的半轴锥孔及与其同心的7728轴承孔均发生较严重磨损,使不少车架由此而报废。为修复这些车架,我们试用动力头镗削此二孔,现已成功,从而解决了这一大型工件较难以加工修复的问题。一、修复方案(见图1):经我们对五个废弃的后桥箱体的实际测量,发现φ86~(10.14)的 After the C-80 and C-100 bulldozers were used for many years, the axle cone bore of the rear axle box assembly (commonly known as the big frame) and the 7728 bearing hole concentric with it both suffered from severe wear, resulting in many frames. This is scrapped. In order to repair these frames, we tried to drill these two holes with a power head and it has now succeeded in solving the problem that this large-sized workpiece is difficult to repair and repair. First, the repair program (see Figure 1): After we actually measured the five abandoned rear axle boxes, we found that φ86~(10.14)