Study on Workpiece vs Mandrel Velocity and Friction Factor Relationship of Fully-floating Mandrel Mill（Part I）

An overall measurement of all the relevant parameters of each roll stand of the fully-floating mandrel pipe mill located at Baoshan I & S Co.,Ltd.,including rolling force and mandrel velocity,etc.,resulting in the workpiece speed characteristics.Furthermore,the workpiece vs mandrel velocity relationship is studied,and the friction condition between the workpiece and the mandrel is analyzed.It is identified that the friction factor of the two at each individual roll stand is 0.033 ~ 0.074,and the factor goes up along the rolling direction.The conclusion provides basis for identifying the metal deformation law and the mandrel friction effect mechanism during the mandrel mill rolling process.