JPH08276215A - Device for straightening shape of steel strip and method thereof - Google Patents

Abstract

PURPOSE: To prevent the slip of bridle rolls provided in front of and behind a tension leveler and to prevent the generation of rubbed mark at the time of adjusting tension of a steel strip such as a hot rolled steel sheet, cold rolled steel sheet, galvanized steel sheet, tinned steel sheet and electric steel sheet by removing oil content remaining on the steel strip by suction. CONSTITUTION: This device is a tension leveler device which is provided with a suction wringer roll 10 for continuously removing rolling oil or rust preventive oil on the steel strip, inlet-side bridle rolls 20 and outlet-side bridle rolls 40 for applying tension to the oil-removed steel strip and a tension leveler 30 which is arranged between the inlet-side bridle rolls and the outlet-side bridle rolls and with which the shape of the steel strip is straightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for straightening the shape of a steel strip in continuous annealing equipment, electrogalvanizing equipment, hot dip galvanizing equipment and the like.

[0002]

2. Description of the Related Art As shown in FIG. 3, a shape correcting device for a steel strip has bridle rolls 20 and 40 arranged on the inlet side and the outlet side for adjusting the tension of the steel strip. In this device, when the shape of the steel strip is corrected in a high tension state, if oil such as rolling oil or rust preventive oil stays in the steel strip, bridle slip occurs and Unable to maintain the balance of tension on the output side. For this reason, a scratch-like defect occurs in the steel strip, which becomes a quality defect and is not preferable in terms of yield. In particular, in the shape correcting device having the tension leveler 30 between the entrance-side bridging rolls 20 and the exit-side bridle rolls 40, there is a problem that the shape correction is insufficient due to insufficient tension.

Japanese Patent Publication No. 4-49032 discloses a water-absorbing roll for removing water accumulated in a metal steel strip and treated water. However, this publication does not show any application to the shape correcting device and the problems of the conventional shape correcting device. Further, in JP-A-51-49140, an oil leveling roll is arranged for the purpose of improving the detection accuracy of the surface flaw detection device. However, even if the oil leveling roll is arranged in the shape correcting device having the bridle roll, the amount of oil on the steel strip does not change, so that it is impossible to prevent the occurrence of slip.

[0004]

As described above, when the shape straightening device having the bridle roll is used to correct the shape of the steel strip containing the rolling oil and the rust preventive oil, the shape is corrected in a high tension state. Then, bridle slip occurs, and there are problems that scratches are generated and the correction effect is insufficient. Further, it is necessary to remove the oil on the steel strip in order to prevent bridle slip, which necessitates the provision of a separate steel strip cleaning facility, resulting in a high cost.

The present invention has been made in view of the above circumstances. When the tension of a steel strip such as a hot-rolled steel sheet, a cold-rolled steel sheet, a galvanized steel sheet, a tin-plated steel sheet, and an electromagnetic steel sheet is adjusted, the present invention is applied to the steel strip. The purpose is to remove the accumulated oil by suction to prevent the bridle rolls before and after the tension leveler from slipping and to prevent the occurrence of scratches.

[0006]

The shape straightening device of the present invention is a suction ringer roll for continuously sucking and removing oil on a running steel strip, and a predetermined tension is applied to the steel strip from which the oil has been removed. It is provided with an entrance-side bridle roll and an exit-side bridle roll, and a tension leveler arranged between the entrance-side bridle roll and the exit-side bridle roll to correct the shape of the steel strip.

The shape correcting method of the present invention comprises a step of continuously sucking and removing the oil component on the steel strip running on a suction ringer roll, and a steel strip from which the oil component has been removed by an inlet side bridle roll and an outlet side bridle roll. The method includes a step of applying a predetermined tension and a step of correcting the shape of the steel strip tensioned by the tension leveler.

[0008]

According to the present invention, since the oil on the steel strip is removed by the suction ringer roll to correct the shape, the bridle roll can be prevented from slipping and the occurrence of scratches can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a steel strip shape correcting device according to the present invention. In this device, a suction ringer roll 10, an entrance side bridle roll 20, a tension leveler 30, and an exit side bridle roll 40 are sequentially arranged along the traveling direction of the steel strip. In this device, the tension leveler 30 corrects the shape of the steel strip while adjusting the tension of the continuously running steel strip by the bridle rolls 20 and 40 on the inlet side and the outlet side. These configurations are similar to those of the conventional shape correcting device shown in FIG. In the present invention, the suction ringer roll 1 is further provided in front of the entrance side bridle roll 20.
0 is arranged and the roll 10 sucks and removes oil components such as rolling oil and rust preventive oil that stay on the steel strip. As shown in FIG. 2A, the suction ringer roll 10 has an outer peripheral portion 12 made of an ultrafine fibrous nonwoven fabric, and the inside 14 of the roll is held in a vacuum state. The rolling oil and rust preventive oil staying on the steel strip are suction ringer rolls 1.
When it comes into contact with the surface of 0, the oil component is sucked into the nonwoven fabric due to the capillary phenomenon, and the oil component in the nonwoven fabric is further sucked into the inside 14 of the roll which is kept in a vacuum state. The oil sucked inside the roll is sucked by the suction pump 16 and removed to the outside (pit 18) through the flexible tube as shown in FIG. 2B.

According to this apparatus, the oil content accumulated on the surface of the steel strip is sucked by the suction ringer roll 10, so that the oil content is removed from the surface of the steel strip, and the tension leveler, the bridle roll 20 on the inlet side and the outlet side. , 40 is used in a high tension state, bridle slip does not occur and the shape of the steel strip can be corrected.

The steel strip which is the object of oil removal in the present invention is not particularly limited as long as it is a steel strip produced by hot rolling and / or cold rolling. It can be applied to rolled steel sheets, cold rolled steel sheets, electrogalvanized steel sheets, hot-dip galvanized steel sheets, tin-plated steel sheets, magnetic steel sheets and the like. Also,
The difference in the shape of steel strip (thickness, width, length of steel strip) and surface finishing method (mirror finish, dull finish) does not significantly reduce the oil removal capability. Therefore, even if the tension leveler 30 corrects the shape of the steel strip while maintaining the high tension state with the bridle roll 20.40, it is possible to stably perform the shape correction without causing priddle slip. . With regard to the suction ringer roll 10, if it is possible to remove the oil component on the surface of the steel strip by the capillary effect of the roll outer peripheral portion and / or the suction effect by keeping the roll central portion in a vacuum or reduced pressure state,
In particular, its material and shape are not limited. Further, in the present invention, the oil removed from the surface of the steel strip is not only a rust preventive oil applied to prevent the steel strip surface from rusting, but also an oil applied for other purposes, and more than one kind of oil. It may be a composite of oils.

Next, examples of the present invention will be described.

Table 1 shows the appearance of the steel strip surface after using the tension leveler. When the suction ringer roll is not used (comparative example), bridle slip occurs due to the effect of the rust preventive oil applied to the steel strip, and after using the tension leveler, scratches partially or entirely on the surface. did.
On the other hand, when the rust preventive oil on the steel strip was removed by using a suction ringer roll before using the tension leveler (Example), no scratches due to bridle slip were observed in any steel sheet size. , Was able to maintain a good surface appearance.

Table 2 shows the effect of straightening straightening by the tension leveler. When the suction ringer roll is not used (Comparative Example), the oil content on the steel strip is passed through the leveler with the oil adhered, so that the effect of straightening elongation is small. On the other hand, when the rust preventive oil on the steel strip was removed using the suction ringer roll before using the tension leveler (Example), the steel strip after straightening became flat, and a sufficient straightening effect was obtained. .

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

[Effects of the Invention] Hot rolled steel sheet, cold rolled steel sheet, galvanized steel sheet,
When adjusting the tension of steel strips such as tin-plated steel sheets and electromagnetic steel sheets, the oil accumulated on the steel strips is removed by suction to prevent slipping of the bridle rolls before and after the tension leveler, and to prevent scratches. It exerts a remarkable effect that can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic view of a steel strip shape correcting device showing an embodiment of the present invention.

2A and 2B show a suction ringer roll arranged in the shape correction device of FIG. 1, FIG. 2A is an explanatory view showing a cross section of the roll, and FIG. 2B is an explanatory view showing a suction process of oil.

FIG. 3 is a schematic view of a conventional shape correcting device for a steel strip.

[Explanation of Codes] 10 ... Suction Ringer Roll, 20 ... Incoming Bridle Roll, 30 ... Tension Leveler, 40 ... Outgoing Bridle Roll.

Claims (2)

[Claims] 1. A suction ringer roll for continuously sucking and removing oil on a running steel strip, an inlet side bridle roll and an outlet side bridle roll for applying a predetermined tension to the steel strip from which the oil has been removed, A shape correcting device for a steel strip, which is arranged between a side bridle roll and an exit side bridle roll and includes a tension leveler for correcting the shape of the steel strip. 2. A step of continuously sucking and removing oil content on a steel strip running on a suction ringer roll, and a step of applying a predetermined tension to the steel strip from which the oil content is removed by an entrance side bridle roll and an exit side bridle roll. And a method of straightening the shape of a steel strip tensioned by a tension leveler.