球墨鑄鉄軸瓦端磨,是当前鉄路运輪中的一个重大問題。1966年,全路列检和站修的換瓦总数为五十八万三千多快,由于球鉄軸瓦端磨所造成的热軸和燃軸事故也很多,1967年燃軸事故1,917件,其中切軸14起,造成重大事故6件;据有些局反映,1968年第一季度燃軸,比1967年同期又有增加,并 Nodular cast 鉄 bearing end mill, is a major problem in the current 鉄 road runner. In 1966, the total number of changeovers for the whole road inspection and station repair was more than 583,000. There were also many hot shaft and burning shaft accidents caused by ball mill end bearing grinding, 1,917 burning shaft accidents in 1967, Of which 14 were cut from the shaft, resulting in 6 major accidents. According to some reports, the first round of combustion in 1968 had a further increase over the same period in 1967 and