The slitting line utilizes the constant torque motor characteristics of DC motors and adopts automatic field weakening control, which improves work efficiency and saves costs. 1.4. 1.4. 2250mm 2250mm cross-cutting unit process flow This unit uses horizontal coil loading. After adjustment, the pressure roller is pressed down and the steel coil binding belt is removed; with the help of the slitting machine, deep bending roller and pressure roller, the steel coil head is opened, and the plate head is guided into the pinch roller of the preliminary calibration machine, and then into the longitudinal direction. Cut and level. Then the starting machine is retracted, the pressure roller is lifted up and the deep bending roller is pressed down at the same time. The steel plate enters the hydraulic centering device through the preliminary calibration machine and the looper bridge, enters the 11-roll fine calibration machine and the fixed-length shear to complete the tape threading process; the material is cut off The computer behind the head is cleared and the length measuring device is put into use. Then it can be automatically sheared under the control of the computer, and the finished materials are collected by the random splicing platform. When the shear quantity of the slitting line reaches the set value, the entire line will automatically stop. The finished materials are lifted out of the workshop and packed outside the line. The automatic control of the unit is completed by PLC. The setting parameters are input through the touch screen human-machine interface, and various parameters can be set according to the preset parameter range.