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Causes and measures of rolling in cold rolling

Causes and measures of rolling in cold rolling

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The reason and method of winding in cold rolling refers to the situation that the steel coil is in a state of drift that is not fixed relative to the position of the middle line of the rolling mill, and is a special form of deviation. Reasons for the rollover:

The reason and method of winding in cold rolling refers to the situation that the steel coil is in a state of drift that is not fixed relative to the position of the middle line of the rolling mill, and is a special form of deviation. Reasons for the rollover:


1. The difference between the steel strip and the steel tube is the same. The difference between the maximum value and the minimum value of the thickness measurement of the steel strip wide gauge is the difference between the steel tube and the steel tube. Generally, the difference between the same steel pipe is less than 0.05mm, and the foundation has no roll-up phenomenon; on the contrary, it is easy to take the roll.


2. If the oil scraper is not operated by the oil scraper and the wind pressure is insufficient, it will cause the rolling steel to have a certain residual rolling oil, which will reduce the friction coefficient between the steel strips. so that the two sides of the steel coil tend to move more and more. Rolling up.


3, the amount of reduction, a center, AS-U preset value of each pass of the reduction of the distribution of unreasonable will affect the steel pipe type, profile, easily caused by the roll; when rolling the first pass, if it is the right The preset values ​​of the center and AS-U are not suitable, resulting in the steel belt showing a single-side wave and a steel pipe type, which easily causes the roll.


4. Abnormality during rolling High-speed rolling presents a broken belt, and the tension at the moment disappears. The city causes the steel belt to roll.


5. Others The front and rear tensions are not matched, the roller system is not properly equipped, and the work rolls are tapered, which easily brings the roll.


Sweeping mode:


1, early control for mild roll, can be controlled by the curve of the steel pipe type curve; for moderate roll, you can move the steel roll in the whole in the take-up area; for serious roll, it should be real-time Inform the craftsman to confirm, then click on the policy thickness and then roll it into unloading.


2, the development of a reasonable reduction procedure Reasonable reduction procedures, reasonable distribution of rolling passes and a reasonable given a center and AS-U default value, can be useful to avoid the emergence of serious roll.


3, the scale operation The high difference between the steel pipe is the primary cause of the occurrence of the roll, through the process of optimizing the process and improving the scale operation to reduce the difference between the steel strip and the steel pipe.


4, the inspection work through the process of inspection, when the design of the scraper system of the rolling equipment is inherently inadequate, the equipment should be improved, and at the same time in each pass of rolling, the steel strip is rolled onto the process paper, through the process paper Absorb the loss profile rolling oil to increase the friction between the steel strips to prevent the roll.