In the process of sheet metal processing, the slitting line sometimes has uneven sheet coiling. So do you know what are the reasons for the uneven coiling of plates?

The so-called uneven coiling refers to a telescope-like failure caused by the coiling misalignment of the coil after coiling, which is called uneven coiling.

There are several reasons for this:

Uneven coiling caused by insufficient tension: If the tension is weak at the beginning of the coiling, it is prone to misalignment at the end of the coiling. Therefore, the tension is increased at the beginning, and the larger the roll, the smaller the tension. The operation method can effectively prevent the occurrence of misalignment.

Dislocation caused by unbalanced coiling tension: poor straight angle when the coil head is cut, bad straight angle when occluding, incorrect width setting of the uncoiler after the plate is passed, and the steel plate is sent out after the slitting machine is cut and the steel plate is sent out for comparison. The length of the two sides of the steel coil will be different during the big movement. The short side is easy to produce tension changes. Therefore, when winding the steel coil on the expansion and contraction drum of the winder, it is best to confirm that the entire width direction of the steel coil is accurate, and it is tightly attached to the expansion and contraction drum, and then the coiling can be started.

Dislocation caused by poor bite position of the jaws in the expansion and contraction drum of the winder: When the position of the knife, the middle divider, and the bite positions in the jaws of the expansion and contraction drum of the winder are inconsistent, the change of the left and right tension of the steel coil will cause the coiling misalignment.

Coiling dislocation caused by the left and right swing of the steel belt in the looper: The left and right swing of the steel belt in the looper will cause the angle of entering the tension device to change, which will cause the winding dislocation. Use felt and other soft materials to press on the steel belt to prevent the steel belt from swinging.

Coiling misalignment caused by production line stoppage: When the production line is stopped and started, when the tension between the tension device and the winder is reduced, the contact pressure between the steel strips will be reduced, and lateral misalignment is likely to occur, which will cause coiling misalignment. Flexible use of winders and dividers can effectively prevent winding misalignment. 

Rolling misalignment caused by poor divider width setting: The general divider width setting is the width of the finished product plus the thickness of the board. If it is too wide, the steel plate will move left and right, and the coiling will be misaligned.

During coiling, even if there is no abnormal coiling, when the steel coil is withdrawn from the winder, the expansion and contraction drum shrinks, and the expansion part of the expansion and contraction drum and nearby parts will suddenly experience arching of the inner diameter. The inner diameter of the thin plate below 0.6mm is more prone to arching, and it also occurs from time to time when paper tubes and boots are used. In addition, the temperature rise of the coil during coiling is also worth noting. The cause of arching is excessive winding tension.

Wuxi Bangzhou Machinery Manufacturing Co., Ltd. is a company specialized in steel coil straightening machine, slitting line, cut to length line and flat bar straightening and chamfering machine. Our company is a professional slitting machine manufacturer. If you are interested in slitting machines, don’t hesitate to contact with us.