The Analysis of the Causes of Abnormal Phenomenon in Longitudinal Shear Processing and Its Counterme

Classification of abnormal phenomena in slitting line processing:

Coiling: (1) soft coiling; (2) uneven coiling; (3) inner diameter arching.
Flatness: (1) snaking; (2) edge waves; (3) waist creases; (4) coiling and printing; (5) wrinkles.
Defects: (1) knife prints; (2) scratches; (3) indentations; (4) bruises; (5) scratches.
Section: (1) bad edge; (2) bad burr; (3) ceiling lattice.
Others: (1) not cut off; (2) pollution; (3) poor size.

Causes and countermeasures of abnormal coiling shape:
(1) Soft coil: When the coiled coil withdraws from the reel of the coiler, the elliptical soft coil phenomenon caused by the relaxation of the coil is also called duck egg.
(2) Uneven coiling: The telescope-like fault caused by misalignment of coiled steel coils is called irregular coiling, or telescope.

The causes and dislocation shapes are as follows:

A: Uneven coiling caused by insufficient tension. If the tension is weak at the beginning of coiling, the misalignment will easily occur at the end of coiling. Therefore, when the tension increases at the beginning, the larger the volume, the smaller the tension.
The operation method can effectively prevent the occurrence of dislocation.
B: The dislocation caused by unbalanced coiling tension. When the coil head is cut off, the straight angle is not good, the occlusion is not good, the width of the uncoiler is not set correctly after passing through the plate, and the length of both sides of the coil will be different when the steel plate is sent out and the rear guide of the longitudinal shear is moved greatly. The short side tends to produce tension changes. Therefore, when coiling the coil on the expanding and shrinking drum of the coiler, it is better to confirm that the direction of the whole width of the coil is accurate and stick closely to the expanding and shrinking drum before coiling can begin.
C: Misalignment caused by bad occlusion position of pliers in expanding and contracting drum of winder. When the position of the matching cutter, the middle separator and the occlusion position of the expanding and contracting drum clamp of the coiler are different, the change of the tension between the left and right of the coil will cause the coiling dislocation.
D: Coiling dislocation caused by the swing of the steel strip in the looper. The swaying of the steel strip in the looper will cause the angle of the tension device to change, and the coiling dislocation will occur. Pressing soft materials such as felt on the steel belt can prevent the swing of the steel belt.
E: Coiling dislocation caused by production line stall. When the production line stops and starts, when the tension between the tension device and the coiler decreases, the contact pressure between the steel strips will decrease, and the transverse dislocation will easily occur, resulting in the coiling dislocation. Flexible use of winder and separator can effectively prevent winding misalignment.
F: Coiling dislocation caused by bad width setting of separator. The general divider width setting is: finished product width + plate thickness. If it is too wide, the coiling dislocation will occur when the steel plate moves left and right. (3) When the inner diameter arch coiling occurs, even if no abnormal coiling occurs, when the steel coil withdraws from the coiler, the expansion and shrinkage drum will shrink, while the expansion part of the expansion and shrinkage drum and the adjacent parts will suddenly occur the phenomenon of inner diameter arch. Thin plates less than 0.6 mm are more likely to occur. The use of paper tubes and boots also occurs from time to time. In addition, the increase of coil temperature in coiling is also noteworthy. The reason of arching is that the coiling tension is too large.
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