自 1990年检修从波兰进口的 C61Y型敞车以来 ,检修单位由于对半球形上心盘裂纹、裂损 (见图 1)故障无检修依据 ,只得按报废处理。笔者对 1998年— 2 0 0 0年上半年计 2年半时间里半球形上心盘报废情况进行了调查 (见表 1) ,发现裂纹和裂损部位主要是法兰板 ,严重者 4个大角都掉 Since the overhaul of the C61Y Gondola imported from Poland in 1990, the maintenance unit has been scrapped due to the failure to repair cracks and cracks in the hemispherical top plate (see Figure 1). The author investigated the hemispherical heart-shaped disc scrap in two and a half years from 1998 to 2000 in the first half of the year (Table 1), and found that the cracked and cracked parts are mainly flange plates, and in severe cases, four Large horns are off