1. Head pile steel:
1) The setting of rolling speed and roll diameter is incorrect. (Correctly set the rolling speed, roll diameter and tension).
2) Because the shelf size does not meet the requirements (too wide or too high), it is stuck in the guide. (The treatment measure is to observe the material type frequently, and the method of adjusting the roll gap is “secondary ellipse and first circle”).
3) The raw material is scratched or mixed, the steel temperature is too low and it is difficult to bite into it, and there are foreign objects in the guide. (The treatment measure is to check it carefully before passing the steel).
4) The guides and guards on the shelves are broken, steel is stuck, and the opening of the guides and guards is too large or too small, resulting in inverted steel. (Change guides in time or in advance).
5) Elbows caused by incorrect rolling lines on the shelves and deflection of guides. (The treatment measures are to watch the guide frequently, observe the material type frequently, and measure the size frequently).
2. Intermediate pile of steel:
1) Bad material shape causes inconsistent tension and breaks the rolled piece. (The treatment method is to adjust the material type and control the tension).
2) Broken material or split head.
3) The rolling mill loses speed. (The treatment measure is to find the cause of the electrical system).
4) Broken roll.
5) Skidding. (The treatment measure is to re-grind the rolling groove). Unsuitable plywood at the exit of rough rolling, control of material shape, height of guide beam