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阐述了1150初轧机压下螺丝回松对其使用寿命的影响，给出了回松实测的基本原理及方案，并根据实测结果分析研究了回松的原因及规律。
The influence of the screw back on the service life of 1150 rolling mill was expounded in this paper. The basic principle and plan of the back - slack measurement were given. The reason and rule of back to slack were analyzed according to the measured results.