In the slittingprocess, if the steel coil is carried out in a relaxed state, the internal layers of the steel coil will slide. This will lead to various abrasions on the surface of the steel, as well as scratches caused by repeated friction.
In fact, during the operation of steel slitting equipment, even the normal coiling of the steel coil, in the case of the normal tension will also produce abrasions. According to the analysis of production experience, it mainly includes the following three situations:
First,abrasion caused by the unreasonable setting of decoiler.
It mainly includes the following situations: during the operation of the slitter machine, when the tension of the decoiler exceeds the tension of the base material coil, or when the brake of the decoiler is insufficient, or when the pressure of the decoiler check roller is insufficient, the steel coil will relax and cause abrasion.
In addition, coiling of loose steel coils will be re-tensioned when uncoiling, resulting in abrasion. Once the decoiler tension is too large, the steel plate is pulled loose when suddenly rolled tight, will also produce abrasions. Therefore, measures should be taken to reduce the braking force when the work is done.
Second,abrasion caused by improper coiling machine settings. Loose coils are easy to occur in the process of starting up after the slitting unit stops. Abrasion can be caused by the relaxation of the shear outer ring and the transverse dislocation of the steel coil when uncoiling. In addition, coil abrasion will occur when the steel coil is inserted into the core of the loose shear and rewound.
A third condition is the coiling caused by hand expander. When the loose coil is rolled under the condition of insufficient tension of the dividing machine, and the expansion and contraction device is tensioned by hand, the abrasion will be caused by dislocation. In addition, abrasion will occur when the sliding inner steel band lateral swing or overlap.
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