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Hot strip finishing work roll use
Release time:
2018-12-06 11:40
1. The cooling water shall be continuous and sufficient to cool the roll. During normal rolling, the surface temperature of the work roll shall be strictly controlled. If the roll temperature is too high, the roll shall be replaced immediately to prevent premature thermal fatigue cracks of the roll. The minimum cooling water volume of the roll shall be maintained at 400 -600m 3 /h;
1. The cooling water shall be continuous and sufficient to cool the roll. During normal rolling, the surface temperature of the work roll shall be strictly controlled. If the roll temperature is too high, the roll shall be replaced immediately to prevent premature thermal fatigue cracks of the roll. The minimum cooling water volume of the roll shall be maintained at 400 -600m 3 /h;
2. The defects (mainly turtle cracks) on the surface of the roll must be removed before each roll is put on the machine. Even if there is no turtle crack, the fatigue layer on the roll surface should be removed. The normal grinding of hot-rolled strip finishing work roll regular is generally 0.15~0.30mm/time. The normal grinding of the working roll regular for medium plate finishing is generally 0.25~0.50mm/time (some manufacturers often change rolls for a long period in order to reduce the number of roll changes, thus the roll wear is large and the one-time grinding is also large, about 1.0-3.0mm, which is not conducive to the rational use of rolls).
3. The roll is prone to cracks in use, which is the greatest harm to the normal use of the roll. Since the roll crack is formed slowly in the early stage of rolling, it will not cause too serious harm to the roll. But when the crack is formed to a certain extent, and then continue to use, the moire will quickly expand to the depth and length direction. The first is to increase the amount of grinding and reduce the amount of rolling material of the roll; the second is that if it is serious, it will cause the occurrence of roll peeling, and even a large loss of meat. Therefore, the rational use of rolls, it is recommended that each roll on the machine service rolling amount of 1800~2400 tons is appropriate. It is recommended to calibrate the hot rolling work roll according to the rolling kilometer, and change the roll once every rolling 40~60 kilometers; for the medium plate roll, it is recommended to change the roll at most 2-3 working shifts. Excessive rolling will lead to excessive roll wear and micro-crack deepening, increase the amount of secondary grinding, roll consumption increased. The quality of the sheet (roughness, flatness, dimensional accuracy, thickness deviation) will also be severely reduced.
4. When the cooling water system fails or a rolling accident occurs during the rolling process, the damage to the roll is inevitable. In order to avoid the formation of deep turtle crack damage, when a rolling accident occurs, the rolling mill should be opened as soon as possible to reduce water flow. The roll shall be inspected under the machine and the crack shall be thoroughly ground out. Otherwise, rolling on the machine again, the residual crack will expand rapidly, resulting in large spalling.
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