JPH10230319A - Device for stable threading of slit strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve threadability by providing pinch rolls capable of effecting one side reduction between a slitter and a tension reel, controlling the rolling force of pinch rolls on the drive side and the work side, and straightening the strip in the direction of keeping the strip apart from the center line. SOLUTION: Pinch rolls 7 nondriven and capable of adjusting one side reduction are provided on the outlet side of a slitter 2. At the time of threading, only the vicinity of a center part of a steel sheet 5 of the work side WS is subjected to reduction, and a tensile strength distribution δ (x) due to frictional force between the steel strip 5 and the pinch roll 7 is generated; thereby, giving a clockwise angular moment M on the strip 5, the strip is moved from the line-center to the work side WS. Further, the amount of correction of deviation between the line-center and the strip 5 is controlled through the optimum adjustment of rolling force on the strip 5 by the pinch roll 7 capable of adjusting one side reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-section cutting and threading of a steel sheet by a slitter device installed in a recoiling line for a cold-rolled steel sheet, a hot-rolled steel sheet, a plating steel sheet, and a skin pass line. The present invention relates to a device for stably passing a slit steel plate.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional steel sheet 5 unwound by a pay-off reel 1 is slit into two or more strips by a slitter device 2, and each steel sheet slit by a tension reel 3 is removed. Winding and slitting device 2
A device for steering a slit steel plate is not particularly provided between the tension reel 3 and the tension reel 3.

In general, the shape of the steel sheet on the entry side of the slitter device 2 and the threading properties of the steel sheet after slitting have the following tendencies. In other words, if the center of the steel sheet on the entry side is elongated compared to both ends, after the slit, the steel sheet tends to greatly spread in the direction away from the line center, and conversely, both ends of the steel sheet are centered. In the case of the shape elongated compared to the portion, the steel plates tend to lean toward the line center after the slit. Therefore, the slit steel sheet moves in the direction toward the line center due to its shape, the crown of the roll installed in the line, the line tension, etc., and makes a light contact, or conversely, the steel sheet moves to the line center. When the line passing speed of the line is increased, scratches may be formed due to contact between the steel plates, or the steel plate may be too far from the line center, and the coil on the tension reel may be too far away from the line center. Or the winding shape is getting worse.

In order to solve such a problem, conventionally, measures such as installing a separator 4 or the like between the slitter device 2 and the tension reel 3 and restricting a threading route between the slit steel plates to take a sheet are taken. ing.

[0005]

However, since the separators and the like themselves restrict the threading route of each steel sheet and do not have a steering function of the steel sheet,
Various problems occur when the steel sheet meanders. For example, if the shape of the steel plate on the entrance side of the slitter device is poor, the slit materials may come into light contact with each other or flow in a direction away from the line center, causing a problem that the winding shape is disturbed by the tension reel.
In addition, if meandering occurs while passing a thick steel plate, the separator may be damaged, and if meandering occurs with a thin steel plate, the end face of the steel plate may be damaged. There is. As a result, the steel sheet had to be passed at a low speed so as to minimize the meandering of the steel sheet, and the workability was not always good.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for winding a steel sheet cut into two or more strips around a tension reel in a slitting operation of a refining line and passing the sheet through a tension reel. A stable sheet passing apparatus for a slit steel sheet, comprising a pinch roll capable of adjusting a one-sided reduction therebetween. When the rolling force of the drive side pinch roll and the work side pinch roll can be controlled, the steel sheet can be corrected in a direction away from the line center.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the apparatus for stably passing a slit steel sheet according to the present invention, the steel sheet after slitting has a poor sheet passing property, and is close to a line center. In the case of deviation in the direction, it is possible to correct the deviation of the steel sheet by a pinch roll that can be adjusted one-side down and installed between the slitter device and the tension reel.

For example, as shown in FIG. 1, when a non-driven, single-pitch adjustable pinch roll 7 is installed, if only the vicinity of the center of the steel plate of the work side WS is lowered, the steel plate is placed between the roll and the roll. Tension distribution σ due to frictional force
(X) occurs, and a clockwise rotational moment M is generated by σ (x). The steel sheet moves in a direction away from the line center to the work side WS by the rotational moment M.

Further, as a result of investigating the amount of displacement correction δ of the steel sheet after slitting in the refining line and the rolling force P of the pinch roll which provides the optimum tension distribution for threading, it was found that the results are as shown in FIG. .

From these results, it has been clarified that the deviation correction amount δ between the line center and the steel sheet can be controlled by optimally adjusting the rolling force P on the steel sheet by the pinch roll capable of adjusting the one-sided reduction. As described above, it is possible to improve the threading property of the slit material by installing a pinch roll that can be adjusted one-side down on the exit side of the slitter device and adjusting the rolling force.

FIG. 3 shows an example of the structure of a pinch roll which can be adjusted in one direction. The upper pinch roll is divided into four or more parts so that one side of each of the slit members 8 and 9 can be pressed down, and a pinch roll to be pressed down is selected according to the passing state. The lifting and lowering of the pinch rolls 10 to 13 is performed by the hydraulic cylinder 14 or the like, and the tension is adjusted by controlling the rolling force on the slit members 8 and 9 to control the straightening amount of the steel sheet. For example, if the slit steel sheet tends to move toward the line center, the steel sheet is corrected in a direction away from the line center by pressing down the drive side upper pinch roll 11 and the work side upper pinch roll 12. The straightening amount can be controlled by adjusting the rolling force of the pinch roll. If the rolling force is increased, the amount of the steel sheet separated from the line center increases. Note that the number of pinch roll divisions may be determined according to the number of slits in the line.

[0012]

EXAMPLE As shown in FIG. 4, a pinch roll 15 capable of adjusting the pressure in one direction was installed on the exit side of a slitter device 2 of a refinement line. The installation position is on the entrance side of the split shear 16, and this area is a place where the slit material is most likely to make light contact with each other or to be too far from the center line.
It had to be passed at a low speed of about 0 to 100 mpm. When the pinch roll 15 was installed and slit, the steel plate 5 made light contact, but when the pinch roll 15 lowered the line center side of each slit material, the contact of the steel plate 5 disappeared, and the passing speed was increased to about 300 mpm. Became possible.

[0013]

According to the present invention, it is possible to prevent a steel plate slit by a slitting device from being lightly contacted at a center or from being too far away from a center, thereby enabling stable high-speed sheet passing.

[Brief description of the drawings]

FIG. 1 is a view showing a stable sheet passing apparatus for a slit steel sheet according to the present invention.

FIG. 2 is a diagram showing a relationship between a rolling force P and a deviation correction amount δ of a steel sheet.

FIG. 3 is a diagram illustrating an example of a pinch roll that can be adjusted in one direction.

FIG. 4 is a view showing a line equipped with a slit steel plate stable passing device according to the present invention.

FIG. 5 is a diagram showing a line provided with a conventional slit steel sheet passing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Payoff reel 2 Slitter 3 Tension reel 4 Separator 5 Steel plate 6 Pinch roll 7 Pinch roll 8 Slit material 9 Slit material 10 Drive side upper pinch roll 11 Drive side upper pinch roll 12 Work side upper pinch roll 13 Work side upper pinch roll 14 Hydraulic cylinder 15 Pinch roll 16 Split shear

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65H 23/188 B65H 23/188 Z

Claims (2)

[Claims] An apparatus for winding a steel sheet cut into two or more strips around a tension reel in a slitting operation of a refining line and passing the steel sheet through a tension reel, wherein a pinch capable of adjusting a single pressure down between the slitter apparatus and the tension reel. A stable threading device for slit steel plates, which is equipped with rolls. 2. The apparatus according to claim 1, wherein the rolling force of the pinch roll on the drive side and the pinch roll on the work side can be controlled and the steel sheet can be corrected in a direction away from the line center.