武钢热轧厂的 R636摆式飞剪,若按定尺长度通过同调指针盘刻度去设定同调盘的偏——距.会产生拉剪现象。因此,经系统地分析其剪切特性～同步特性,轨迹特性和剪切工艺特性后,认为产生拉剪的原因是同调指针盘的刻度值系采用近似公式算出的近似值。实践证明,若采用本文推导的精确公式算出的精确值,就不会产生拉剪现象。 R636 pendulum flying shear of Wuhan Iron and Steel Company hot rolling mill, if the length of the scale through the same dial scale to set the co-ordinate plate offset - will produce tension phenomenon. Therefore, after systematically analyzing the characteristics of shear, synchronization, trajectory and shearing, the reason for the generation of shearing is that the value of the dial of the co-ordinate dial is approximated by the approximate formula. Practice has proved that if we use the precise formula derived by the precise value calculated, it will not produce the phenomenon of pulling shear.