我厂750初轧机的上轧辊万向接轴叉头于1989年10月和1990年1月相继断裂,造成全线停产共11小时,断裂部位和形式如图1所示。 1.断裂原因分析 开始有的同志认为是材质和热装时轴与孔的配合过盈量大的原因造成。但经材质取样化验和对轴与孔的尺寸检测结果,均符合原设计 The initial rolling universal joint shaft of the upper mill of 750 mill in our factory broke off successively in October 1989 and January 1990, resulting in a total of 11 hours’ shutdown of the whole line. The fracture site and the form are shown in Fig.1. 1. Analysis of the fracture Some comrades began to think that the material and the hot-loaded shaft and the hole with the interference caused by a large amount of causes. However, the material sampling test and the shaft and hole size test results are in line with the original design