Impact of Cold Shear Region Equipment on Rod Length Rate
Cold shear region is an important unit of steelrolling process. It is the last process of continuous hot rolling. With the development of technology, the requirements of rolling thin strip into strip and flatness of thin strip are higher and higher, and the importance of cold shear process is gradually revealed. The impact of cold shear region equipment on rod length rate is mainly reflected in four aspects.
First, the influence of temperature. Duringmetallurgical transport, the temperature of rolling thin strip is an important factor influencing thephysical properties of rod and strip. In the cold shear process, the temperature of rolled thinstrip continues to decline. After the shear, the component atoms of the sheared thin strip have ahigher energy level and are relatively unstable. The shear heat generated in the shear process ishigher than the cooling rate of thin strip. When thin strip is sheared, its temperature is higher than itsnormal temperature. This will cause plastic deformation and make rod easy to suffer from elongationor reduction. Therefore, accurate measurement of temperature is the key to ensure the length ofthe bar.
The second is the influencing factors of shear force. The shear force during the thin strip shearprocess is the main factor that causes the elongation and reduction of rod. The power and lubricatingcondition of cold shear equipment should be strictly monitored. The cutting section of cold shearequipment should be adjusted properly to ensure that the shear force is limited within a suitablereange, so that the cutting section has good stacking shape, and the length of rod is guaranteed.
Thirdly, the effect of roll position. The roll position directly determines the shape size of the crosssection of the sheared thin strip, which further affects the performance of rod. The lower the rollposition, the larger the cross section of the thin strip, the more plastic deformation and the greater theelongation or shrinkage of the rod. Therefore, the roll position should be adjusted scientifically toensure its stability.
Finally, the impact of rolling mill speed. The speed of rolling mill is too fast, resulting in anincrease in plastic deformation and longitudinal elongation or shrinkage of the bar. Therefore, thespeed of the rolling mill should be adjusted according to the length of the rod in order to meet therequirements.
In conclusion, the influence of cold shear region equipment on rod length rate is mainly reflectedin temperature, shear force, roll position, and rolling mill speed. In order to ensure the rodlength rate, it is necessary to choose appropriate cold shear region equipment, pay attention to thecontrol of temperature, shear force, rolling mill speed and roll position and other factors.
