Rolling material support ball is set, to minimize fish tail with sheet bar and to reduce frictional resistance.
滚动托料球，减少板料划伤，并可减少摩擦阻力。
The model of laminar flow in tubes in rolling motion is established. The dimensionless correlation of velocity is derived, and the correlation of frictional resistance coefficient is also obtained.
建立了摇摆条件下圆管内的层流流动模型，推导出无量纲化的速度表达式，得到摩擦阻力系数关系式。
The model of laminar flow in tubes in rolling motion is established. The dimensionless correlation of velocity is derived, and the correlation of frictional resistance coefficient is also obtained.
建立了摇摆条件下圆管内的层流流动模型，推导出无量纲化的速度表达式，得到摩擦阻力系数关系式。
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