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一、引言钢在热轧时由于轧辊和轧件之间的摩擦而发生变形,如图1所示。热轧时在正常情况下(具有滑动摩擦时)入口侧带钢运动比轧辊慢;出口侧比轧辊快。接触区内存在一中性点 O,该点处带钢速度与轧辊速度相等。入口处与中性点之间作用的摩擦力其方向与轧辊间的带钢运动方向相同;而中性点与出口侧之间作用的摩擦力其方向与轧制方向相反。该摩擦力差为轧制提供所需之能,因此任何压下量都需要有一定的摩擦力;然而摩擦力过大会造成轧制力和力矩变高。
First, the introduction of steel in the hot rolling due to the friction between the roll and rolling deformation occurs, as shown in Figure 1. Hot rolling at the entry side under normal conditions (with sliding friction) the strip moves slower than the rolls; the exit side is faster than the rolls. There is a neutral point O in the contact zone where the strip speed equals the roll speed. The friction between the inlet and the neutral point acts in the same direction as the strip moving between the rolls. The friction acting between the neutral point and the outlet side is opposite to the rolling direction. This difference in friction provides the required energy for rolling, so any reduction requires a certain amount of friction; however, excessive friction can result in higher rolling forces and moments.