JP5786313B2 - Foreign matter removing device, temper rolling equipment provided with foreign matter removing device, and temper rolling method using foreign matter removing device - Google Patents

Description

  The present invention relates to a foreign matter removing device having an adhesive roll for removing foreign matter on the surface of a metal strip, a temper rolling facility having a foreign matter removing device, and a temper rolling method using the foreign matter removing device. Here, the metal strip is a steel strip as a typical example, and means a non-ferrous alloy strip such as an aluminum alloy or a copper alloy. Hereinafter, a steel strip that is a typical example will be described. Of course not.

  The steel strip is obtained by subjecting a steel material such as a slab to hot rolling and cold rolling. After cold rolling, annealing is performed, and temper rolling is performed on the steel strip as necessary. Such temper rolling is intended to slightly reduce the steel strip and finely adjust the surface properties and / or shape of the steel strip.

  By the way, when temper rolling a steel strip after cold rolling in the previous stage, it is customary to pass a cleaning line for cleaning the surface of the steel strip after cold rolling, but after passing through the cleaning line When the steel strip passes through a pinch roll or a conveyor, foreign matter such as wear powder (metal powder or rubber powder) or dust attached to them adheres to the surface of the steel strip. Next, if the steel strip with metal powder or dust attached to the surface is subjected to temper rolling as it is, the surface of the steel strip will be damaged. Since this scratch has a great influence on an extremely thin steel strip, it becomes a problem particularly when the thin steel strip is temper-rolled.

  As a countermeasure, Patent Document 1 uses a temper rolling facility equipped with a foreign matter removing device to bring a steel roll before the temper rolling into contact with an adhesive roll (adhesive roll), and the steel strip surface. An invention is disclosed in which the metal powder, dust and the like are removed in advance to prevent the steel strip surface from being damaged during temper rolling.

Japanese Patent Laid-Open No. 05-50125

  However, the pressure-sensitive adhesive roll described in Patent Document 1 is difficult to use for a long time while maintaining the adhesive force, and it has been a problem that the life is reached early. That is, since an adhesive roll deteriorates early, there exists a possibility that roll replacement frequency may become high. When the roll replacement frequency increases, not only the productivity of the steel strip decreases, but also the replacement requires costs. Therefore, there is a demand for an adhesive roll with improved durability that can withstand long-term use.

  Accordingly, an object of the present invention is to provide a foreign matter removing apparatus including an adhesive roll having improved durability while maintaining adhesiveness. Another object of the present invention is to provide a foreign matter removing method using such a foreign matter removing apparatus.

In order to achieve the above object, the first invention is a foreign matter removing apparatus including an adhesive roll for removing foreign matter on the surface of a metal strip, wherein the JIS-A hardness X of the peripheral surface of the adhesive roll is 5 ≦ X. ≦ 45 °, moment of inertia Y is 882 N · m ² or less, and X ≧ 0.5 (log ₁₀ (Y / 9.8) +2.5) ² +3.9 (Hereinafter, “JIS-A hardness” is abbreviated as “hardness”).
In the present invention, the moment of inertia Y is GD ² (kgf) represented by 1/2 × W × D ² where the weight of the adhesive roll is W (kgf) and the diameter of the adhesive roll is D (m). · the m ^2), is intended to mean those terms in SI units (N · m ^2).

  Further, the adhesive roll is a pair sandwiching the pass line of the metal strip, and it is preferable that the axis of one adhesive roll and the axis of the other adhesive roll are shifted in the direction of the pass line. .

  A second invention is a temper rolling facility including a temper rolling mill for a metal strip, and the above-described foreign matter removing device on the metal strip entrance side of the temper rolling mill.

  The third invention is a tempering characterized in that, prior to temper rolling, temper rolling of a metal strip, using the foreign matter removing device described above, pressing the adhesive roll against the metal strip to remove foreign matter. It is a rolling method.

  According to the present invention, it is possible to provide a foreign matter removing apparatus including an adhesive roll having improved durability while maintaining adhesiveness. Moreover, according to this invention, it becomes possible to provide the temper rolling equipment provided with this foreign material removal apparatus. Furthermore, according to this invention, it becomes possible to provide the temper rolling method using the foreign material removal apparatus which can extend the use period of an adhesive roll.

It is the figure which showed the cleaning line which pickles a steel strip. It is the figure which showed the temper rolling installation provided with the foreign material removal apparatus according to this invention. It is the figure which showed the correlation of durability and adhesiveness of an adhesive roll, hardness, and moment of inertia.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a cleaning line for cleaning a steel strip used for temper rolling. FIG. 2 is a diagram showing a temper rolling facility including a foreign matter removing apparatus according to the present invention. FIG. 3 is a diagram showing the correlation between the durability and adhesiveness of the adhesive roll, and the hardness and moment of inertia. In the illustrated example, the foreign matter removing apparatus according to the present invention is used by being attached to a temper rolling facility, but its use is not limited to this, and metal powder on the surface of the steel strip in other processes Of course, it can be used to remove dust and the like.

  Now, when temper rolling a steel strip that has been annealed after cold rolling, the steel strip to be subjected to temper rolling is subjected to temper rolling after passing through a cleaning line. A cleaning line 1 for cleaning a steel strip used for temper rolling will be described with reference to FIG. The cleaning line 1 in the illustrated example includes a cleaning facility 5 having an alkaline solution tank 2, a brush tank 3, and a rinse tank 4. When passing the steel strip 6 through the cleaning line 1, first, the steel strip 6 unwound from the coil 7 is attached to the surface of the steel strip by passing through the cleaning equipment 5 and cleaning with an alkaline solution. Wash dirt. Next, the washed steel strip 6 is guided in the feeding direction of the steel strip 6 by the pinch roll 8 and the conveyor 9, and the steel strip 6 is wound around the coiler 10. Here, when the steel strip 6 passes through the pinch roll 8 and the conveyor 9, foreign matters such as metal powder and dust attached thereto adhere to the surface of the steel strip. If the steel strip 6 to which metal powder, dust, or the like adheres to the surface is subjected to temper rolling as it is, the surface of the steel strip 1 is damaged as described above. In particular, adhesion at the leading end of the steel strip 6 where contact with the pinch roll 8 is inevitable is remarkable.

In order to remove foreign matters such as metal powder and dust, a temper rolling facility 12 including a foreign matter removing device 11 shown in FIG. 2 is used. That is, the foreign matter removing apparatus 11 is provided upstream of the two rolling stands 13 and 13 constituting the temper rolling mill, and directly contacts the steel strip 6 and has a pair of adhesive surfaces. The adhesive rolls 14 and 14 are provided. The adhesive roll 14 has a peripheral surface with a hardness X in a range of 5 ≦ X ≦ 45 °, an inertia moment Y of 980 N · m ² or less, and X ≧ 0.5 (log ₁₀ (log ₁₀ ( It is important to satisfy Y / 9.8) +2.5) ² +3.9. Furthermore, it is preferable that the axis center of one adhesive roll 14 and the axis center of the other adhesive roll 14 are shifted in the direction of the pass line, and both are offset. The rolling stand 13 includes a pair of work rolls 15 and 15 that are in direct contact with the steel strip 6 and a pair of backup rolls 16 and 16 that support the work rolls 15 and 15.
In addition, the adhesive roll 14 can use the adhesive rubber roll which lined the rubber layer which has adhesiveness on the surface, for example.
When temper-rolling a steel strip using the temper rolling equipment 12, first, a coil 7 around which the cold-rolled steel strip 6 is wound is set on a coiler 9, and the temper rolling is performed from the coil 7. The steel strip 6 is unwound on the facility 12. Next, the steel strip 6 unwound from the coil 7 is sandwiched between a pair of adhesive rolls 14 and 14 and passed between both rolls to remove metal powder, dust, and the like attached to the steel strip surface. At this time, since the pair of adhesive rolls 14 and 14 are offset, the pressure applied to each adhesive roll 14 is reduced, and the period until the adhesive roll 14 is deteriorated is increased. Therefore, the service life of the adhesive roll 14 is extended. Furthermore, since the area which the steel strip 6 contacts with respect to the adhesive roll 14 becomes large, it becomes possible to remove effectively the metal powder, dust, etc. which adhered to the steel strip surface. Then, for example, the surface of the steel strip is tempered by passing the steel strip 6 from which metal powder, dust, and the like have been removed while being reduced between the work rolls 15 and 15 with a predetermined pressure.

Here, about the adhesive roll of the use mentioned above, when the inventors earnestly investigated about the conditions which improve the durability, it discovered newly that durability depended on the moment of inertia and hardness of this roll. That is, when the adhesive roll 14 that is an adhesive rubber roll is pressed against the surface of the steel strip 6 for 50000 km and rotated, the basic performance of the adhesive roll 14 is to remove metal powder or dust on the surface of the steel strip. The range of moments of inertia and hardness that satisfy the improvement in durability while maintaining sufficient tack was investigated. As a result, as shown in FIG. 3, the conditions for improving the durability while maintaining the adhesiveness of the adhesive roll are as follows: the hardness X is in the range of 5 ≦ X ≦ 45 °, and the moment of inertia Y is It was found that 980 N · m ² or less (100 kgf · m ² or less) and satisfying X ≧ 0.5 (log ₁₀ (Y / 9.8) +2.5) ² +3.9. When the hardness of the adhesive roll 14 is less than 5 °, the adhesiveness is improved, but the durability is not sufficiently ensured. On the other hand, when the hardness of the adhesive roll 14 exceeds 45 °, the durability is improved, but the adhesiveness is not sufficiently ensured. Moreover, even if the hardness of the adhesive roll 14 is in the range of 5 ≦ X ≦ 45 °, if the moment of inertia Y exceeds 980 N · m ² , the roll is damaged significantly during rotation, and wear and peeling Therefore, the durability of the adhesive roll 14 is not sufficiently ensured. Further, regarding the hardness and moment of inertia, when the hardness is low from the viewpoint of roll damage, the minimum allowable moment of inertia is small, and when the hardness is high, the allowable moment of inertia is large. From such a viewpoint, as a result of examining the relationship between the moment of inertia and the hardness, it is important to satisfy X ≧ 0.5 (log ₁₀ (Y / 9.8) +2.5) ² +3.9. I found it. The moment of inertia that is the production limit of the adhesive roll 14 is about 9.8 × 10 ⁻⁴ N · m ² .

In addition, from the viewpoint of more suitably improving the durability while maintaining the adhesiveness of the adhesive roll 14, the moment of inertia Y of the adhesive roll 14 is in the range of 9.8 <Y ≦ 98 N · m ² . The hardness X is preferably in the range of 10 ≦ X ≦ 45 °. Alternatively, the moment of inertia Y of the adhesive roll 14 is preferably in the range of 98 <Y ≦ 980 N · m ² , and the hardness X is preferably in the range of 14 ≦ X ≦ 45 °. Alternatively, the moment of inertia Y of the adhesive roll 14 is preferably in the range of 0.98 <Y ≦ 9.8 N · m ² , and the hardness X is preferably in the range of 7 ≦ X ≦ 45 °.

  In addition, the inventor investigated the distribution of the accumulation amount of metal powder, dust, etc. on the surface of the steel strip. It was found that the accumulation amount of dust and dust was the largest. From this, it was found that the metal powder and dust on the surface of the steel strip can be efficiently removed by pressing the adhesive roll 14 against the leading end of the steel strip 6 to remove the metal powder and dust. Thus, since the period until the adhesive roll 14 deteriorates becomes longer by limiting the pressing range of the adhesive roll 14 to the tail end of the steel strip 6, the service life of the adhesive roll 14 is further increased. It can be extended. For this reason, it is preferable to carry out the removal of foreign matters by the adhesive roll 14 only at the leading end of the steel strip 6.

  The above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. .

Next, the steel strip was temper-rolled by the following two methods. The first method is a method of temper rolling the steel strip after removing the foreign matter on the surface of the steel strip using the foreign matter removing device having the adhesive roll according to the present invention. The adhesive roll is an adhesive rubber roll having a roll diameter of 200 mm, a roll axial length of 1200 mm, a hardness of 20 °, and an inertia moment of 9.8 N · m ² . The second method is a method in which a steel strip is directly temper-rolled without using a foreign matter removing device.

  Steel strip that has been temper-rolled through the above two methods is evaluated by counting the number of surface defects visually and by a defect detector using a CCD camera, calculating the occurrence rate of non-conformity, and comparing the two. did.

  As a result, the quality non-conformity occurrence rate of the temper rolled steel strip was 3.0% when temper rolled without using the foreign matter removing device, whereas the foreign matter removing device according to the present invention was used. When temper rolled after use, it was 0.6%.

  In addition, a plurality of adhesive rolls having various hardnesses and moments of inertia shown in Table 1 were prepared, and their durability and adhesiveness were evaluated.

  The adhesiveness of the adhesive roll is determined by whether the adhesiveness is sufficient to remove metal powder or dust from the surface of the steel strip after the various adhesive rolls are pressed against the steel strip of 50000 km and rotated. It was evaluated as “◯” when sufficient tackiness was maintained, and “x” when tackiness was insufficient. In addition, the durability of the adhesive roll is evaluated by whether or not the adhesive roll is damaged after the various adhesive rolls are pressed against a steel strip of 50000 km and rotated. ○, when damage was observed, it was marked as x. The evaluation results are shown in Table 1.

  As is apparent from the results in Table 1, it can be seen that when the hardness and / or moment of inertia of the adhesive roll falls outside the scope of the present invention, the adhesiveness and durability of the adhesive roll are not ensured.

  Furthermore, the foreign matter on the steel strip surface was removed by the following two methods using the foreign matter removing device described above. The first method is a method of removing foreign matter over the entire length of the steel strip using a foreign matter removing device having an adhesive roll according to the present invention. The second method uses a foreign matter removing device in the same manner, but is a method for removing foreign matter only at the leading end of the steel strip. The steel strip has a width of about 1 m and a total length of about 10,000 m, and the leading end of the steel strip has a tip of 80 m and a rear end of 40 m. The pressing speed of the adhesive rubber roller is 200 m / min.

  When the above two methods are adopted and the foreign matter on the steel strip surface is continuously removed at the same speed, when the first method is adopted, there is a period until the adhesive roll deteriorates and cannot be used. Whereas it was 1 month, when the second method was adopted, the period until the adhesive roll deteriorated and could not be used was 3 years.

  As is apparent from the above description, the present invention makes it possible to provide a foreign matter removing apparatus having an adhesive roll with improved durability while maintaining the adhesiveness. In addition, it has become possible to provide a temper rolling facility including such a foreign matter removing device. Furthermore, it has become possible to provide a temper rolling method using a foreign matter removing apparatus that can extend the period of use of the adhesive roll.

DESCRIPTION OF SYMBOLS 1 Cleaning line 2 Alkaline liquid tank 3 Brush tank 4 Rinse tank 5 Cleaning equipment 6 Steel strip 7 Coil 8 Pinch roll 9 Conveyor 10 Coiler 11 Foreign material removal apparatus 12 Temper rolling equipment 13 Rolling stand 14 Adhesive roll 15 Work roll 16 Backup roll

Claims (4)

A foreign matter removing apparatus comprising an adhesive roll for removing foreign matter on the surface of a metal strip,
A foreign matter removing apparatus characterized in that JIS-A hardness X and moment of inertia Y of the peripheral surface of the adhesive roll satisfy the following formulas (1) to (3).
5 ° ≦ X ≦ 45 ° (Equation 1)
Y ≦ 882N · m ² (Formula 2)
X ≧ 0.5 (log ₁₀ (Y / 9.8) +2.5) ² +3.9 (Expression 3)   The adhesive roll is a pair sandwiching the pass line of the metal band, and the axis of one adhesive roll and the axis of the other adhesive roll are shifted in the direction of the pass line. The foreign matter removing apparatus described.   A temper rolling facility comprising a temper rolling mill for a metal strip, and the foreign matter removing device according to claim 1 or 2 on the metal strip entrance side of the temper rolling mill. When temper rolling a metal strip, prior to temper rolling, the foreign matter removing device according to claim 1 or 2 is used to press the adhesive roll against the metal strip to remove foreign matter. Temper rolling method.

Images