JP2000301237A - Method and device for uncoiling steel strip coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make wrinkle patterns called buckling, mat wrinkles or crape wrinkles fine and inconspicuous when generated due to a yield phenomenon of steel material in uncoiling the steel strip in a continuous pickling line of a hot rolled strip. SOLUTION: A small diameter pressure roller 8 having a diameter of <=120 mm is brought, through a back up roll 9, in contact with the outer peripheral face 2, 3 of a steel strip coil 1 mounted to a pay off reel 6, and the pressure roll 8, while bending/uncoiling the steel strip 1, is turned taking the opposite side to the uncoiling direction as a support point and following the coil outer peripheral face of the steel strip coil 1 reducing its diameter in uncoiling. By this method, wrinkle patterns are made fine and inconspicuous, and the surface quality after painting can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous pickling line for a hot-rolled steel strip and the like, in which a steel strip coil is passed while being unwound and subjected to continuous processing such as pickling. The present invention relates to a method and an apparatus for reducing a wrinkle pattern generated on a steel strip.

[0002]

2. Description of the Related Art In a steel sheet manufacturing process, in order to pass a steel strip through a continuous processing line to perform various processes, a steel strip coil is first rewound in the line. This rewinding is usually performed by pulling out the steel strip 4 with a pinch roll 20 from the steel strip coil 1 mounted on the payoff reel 6, as shown in FIG. In some cases, the sheet is rewound through the deflector roll 7.

[0003] In a continuous pickling line of a hot-rolled steel strip, when the steel strip coil 1 is unwound, the surface of the steel strip 4 has a “bending”.
It is known that a “wrinkle pattern” called “wrinkle pattern” occurs. This wrinkle pattern is caused by the yielding phenomenon of the steel strip when the steel strip wound around the coil and deformed in a straight line at the time of unwinding, and is generated by yield point elongation.

When an annealed steel material is subjected to a process such as a tensile process, a normal ferrite-based material has a yield point elongation. In the cold rolled steel strip, when the product sheet is processed, in order to prevent the occurrence of wrinkle patterns due to this yield phenomenon, after annealing and pickling, skin pass rolling is performed, and the thin sheet product is made in a state where the yield point elongation does not appear. Manufactured. Therefore, in the case of a cold-rolled steel strip, even if a wrinkle pattern occurs during unwinding of the pickling line,
There is no problem because it disappears by skin pass rolling. However, in the case of a hot-rolled steel strip, since skin pass rolling is not performed, a wrinkle pattern generated at the time of rewinding the pickling line remains on the product plate. For this reason, when producing various products using the hot-rolled steel strip, the surface quality is impaired.

Therefore, in a rewinding apparatus for a continuous pickling line of a hot-rolled steel strip, a pressure roll 8 is provided as shown in FIG.
The steel strip coil 4 is pressed against the outer peripheral surface 2 of the steel strip coil 1 by a hydraulic cylinder or the like to bend the steel strip 4. At this time, since the diameter of the steel strip coil 1 is reduced as shown by the broken line as the coil is unwound, the pressure roll 8 for pressing the outer peripheral surface 2 of the coil is positioned at the position indicated by the broken line so as to press the outer peripheral surface 3 of the reduced diameter. Move to

As a well-known example of such a wrinkle pattern countermeasure using the pressure roll 8, the steel strip 4 is lifted obliquely and upward by a roll between the pinch roll 20 and the pressure roll 8, so that the pressure roll 8 and the pressure roll 8 are lifted. To increase the winding angle around both lifting rolls and to apply a large bending in the opposite direction to the steel strip 4, it is necessary to increase the actual flatness of the steel strip 4.
No. 127608 and Japanese Utility Model Laid-Open No. 1-159915. This lifting roll is called a bending roll in the former, and is called a deflector roll in the latter.

[0007]

SUMMARY OF THE INVENTION The present inventors have found that in a continuous pickling line for hot-rolled steel strip, even if the steel strip is unwound by a rewinding device using a pressure roll, the surface of the steel strip after pickling is not removed. At the same time, it was observed that a wrinkle pattern called "tatami wrinkle" or "crepe wrinkle" occurred and became more apparent with a thin steel strip. Then, even if the winding angle around the pressure roll is increased to increase the degree of processing, and further, the bending is performed in the opposite direction as described in the above-mentioned publication, the generation of the wrinkle pattern is not reduced.

[0008] In recent years, with the improvement of hot rolled steel strip manufacturing technology, thin hot rolled steel strips have begun to be used in fields where cold rolled steel strips have conventionally been used, and their quality requirements have become stricter. The wrinkle pattern referred to as "tatami wrinkle" or "crepe wrinkle" is particularly conspicuous when a product manufactured using a hot-rolled steel strip is painted, and thus a countermeasure has been eagerly sought.

Therefore, the problem to be solved by the present invention is as follows:
In a continuous pickling line for hot-rolled steel strip, etc., when the steel strip coil is unwound, the steel strip "strains", "folds" or "crepe" which occurs due to the yield phenomenon of the steel material. The present invention provides a method and an apparatus for making wrinkle patterns called fine and inconspicuous.

[0010]

According to the present invention, there is provided a method for solving the above-mentioned problems, in which a steel strip coil mounted on a pay-off reel has a diameter of 1 mm on a coil outer peripheral surface via a backup roll.
The pressure roll is contacted with a small-diameter pressure roll of 20 mm or less, and while the steel strip is bent and rewound by the pressure roll, the contact action causes the pressure roll to rotate about the fulcrum on the side opposite to the unwinding direction, and A method for rewinding a steel strip coil, characterized in that the steel strip coil is made to follow the outer peripheral surface of the steel strip coil whose diameter is reduced.

The present invention for solving the above-mentioned problems is also directed to an apparatus for bringing a small-diameter pressure roll into contact with the outer peripheral surface of a steel strip coil mounted on a pay-off reel, and bending and rewinding the steel strip with the pressure roll. A backup roll is provided on the pressure roll, and the pressure roll and the backup roll are rotated about a fulcrum on a side opposite to the unwinding direction, and are added to a coil outer peripheral surface of the steel strip coil whose diameter is reduced as the unwinding is performed. A rotation mechanism for moving the pressure roller and the backup roll, and a roll contact mechanism for bringing the backup roll into contact with the outer peripheral surface of the coil, wherein the rotation mechanism is operated by the operation of the roll contact mechanism. This is a steel strip coil rewinding device.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the example of FIG. 1, the method of the present invention involves rewinding a steel strip 4 from a steel strip coil 1 mounted on a payoff reel 6 in the direction of an arrow.
Then, a small-diameter pressure roll 8 having a diameter of 120 mm or less is brought into contact with the steel strip 4 via a backup roll 9 to bend the steel strip 4. Then, with the contact action of the pressure roll 8, the pressure roll 8 is rotated around the point A opposite to the unwinding direction of the steel strip 4 as a fulcrum, and the coil outer circumferential surface 3 of the steel strip coil 1 whose diameter decreases as the steel strip 4 is unwound. To follow. In this example, the contact of the pressure roll 8 with the pressure cylinder 1
7, but various other means such as electric power can be used. These contact pressures are preferably set to a linear pressure of 25 kgf / mm or less.

The unwound steel strip 4 is provided with a deflector roll 7
, And is continuously fed by a pinch roll (not shown). Further, the sheet can be directly sent out by a pinch roll without providing the deflector roll 7. Although the steel strip 4 is bent by the deflector roll 7 in the opposite direction to the pressure roll 8, in the method of the present invention, the bending by the pressure roll 8 makes the wrinkle pattern inconspicuous as described later. Does not change.

The steel strip 4 is bent by the action of the tension of the pinch roll and the payoff reel and the contact force of the pressure roll 8. At this time, since the pressure roll 8 has a small diameter of 120 mm or less, the bending radius is small. For this reason, "hip break", "folding" or "crepe" generated due to the yield phenomenon of the steel strip 4.
The wrinkle pattern, called, becomes less noticeable.

This effect is obtained when the steel strip 4 having a thickness of 1.2 mm or more is used.
Is obtained stably. When the diameter of the pressure roll 8 exceeds 120 mm, the steel strip 4 having a thickness of 1.2 to 1.6 mm is used.
In some cases, wrinkle patterns are conspicuous. Incidentally, the minimum thickness of a hot-rolled steel strip manufactured by a normal hot rolling line is 1.
2 mm. Therefore, in the present invention, the diameter of the pressure roll 8 is set to 120 mm or less. Further, since the width of the hot-rolled steel strip to be processed is about 1830 mm at the maximum and the roll length of the pressure roll 8 is as large as 2300 mm, the roll diameter is reduced to 120 mm or less. A backup roll 9 was provided to prevent bending.

The pressure roll 8 and the backup roll 9 are held by a bearing block 10.
Is reduced by the pressure cylinder 17,
Rotate around the point A as a fulcrum. The fulcrum A may be fixed, or may be movable downward as the diameter of the steel strip coil 1 is reduced. Further, the method of the present invention
It can also be performed by the apparatus of the present invention as shown in FIG.

Next, in the apparatus of the present invention, as shown in FIG. 1, a small-diameter pressure roll 8 is brought into contact with the coil outer peripheral surface 2 of the steel strip coil 1 mounted on the pay-off reel 6, and the steel strip is moved by the pressure roll 8. 4 is a device that bends and rewinds in the direction of the arrow. A backup roll 9 is provided on the pressure roll 8, and the pressure roll 8 and the backup roll 9 are rotated about the point A opposite to the rewind direction as a fulcrum. A rotating mechanism for following the coil outer peripheral surface 3 of the steel strip coil 1 whose diameter decreases as the coil is unwound, and a pressure roll 8
In addition, a roll contact mechanism for bringing the backup roll 9 into contact with the outer peripheral surface of the coil is provided, and the rotation mechanism is operated by the operation of the roll contact mechanism.

FIG. 3 shows another example of the apparatus of the present invention. In this example, as the steel strip coil 1 is reduced in diameter by rewinding, the coil outer peripheral surface 2 is moved to the coil outer peripheral surface 3 and the steel strip 4 is moved to the steel strip 5, and the pressure roll 8 and the backup roll 9 are held. This indicates that the bearing block 10 has rotated from the position indicated by the solid line to the position indicated by the broken line.

The pressure roll 8 is lowered by lowering the bearing block 10 with a pressure cylinder 17 and a balance cylinder 18. The lower ends of both cylinders 17 and 18 are rotatably attached to bearing block 10. The cylinder portion of the pressure cylinder 17 is rotatably attached to the distal end of the arm 14 fixed to the moving beam 15, and the cylinder portion of the balancing cylinder 18 is rotatably attached to the fixed beam 16. . The moving beam 15 can be reduced by a beam cylinder 19 held by a fixed beam 16.

The bearing block 10 has an upper point a and a lower point b rotatably mounted on one end of a link rod 11 and one end of a link rod 12, respectively. The other end of the link rod 11 is rotatably attached to an upper point c of the tip of the arm 13 fixed to the moving beam 15, and the other end of the link rod 12 is attached to a lower point d of the tip of the arm 13. It is rotatably mounted to form a link mechanism.

In order to rewind the band plate coil 1 in the apparatus of the present invention shown in FIG. 3, the band plate coil 1 is mounted on the payoff reel 6, the leading end of the band plate 4 is pulled out, and is passed through a deflector roll 7 to a pinch roll (not shown). After biting, pressure cylinder 1
The pressure roller 8 is brought into contact with the coil outer peripheral surface 2 by lowering the bearing block 10 with the balance cylinder 18 and the balance cylinder 18.
Decrease 5 Then, the pressure roll 8 is brought into contact with the coil outer peripheral surface 2 in a well-balanced manner via the backup roll 9 by the link mechanism abcd, and the steel roll 4 is bent with a small radius of curvature, and the pressure roll 8 itself does not bend.

As the coil is unwound, the diameter of the steel coil 1 is reduced.
As the coil outer peripheral surface 2 shifts to 3, the bearing block 10 is pressed down by the pressure cylinder 17 and the balance cylinder 18 as shown by the broken lines, and the pressure roll 8 follows the coil outer peripheral surface 3. Further, since the moving beam 15 is pressed down by the beam cylinder 19, the link changes to a'b'cd as shown by a broken line, and similarly, the pressure roll 8 is brought into contact with the coil outer peripheral surface 3 in a well-balanced manner. 5 is bent with a small radius of curvature, and the pressure roll 8 itself does not bend.

The method and apparatus of the present invention are applied to unwinding of a hot-rolled steel strip having the above-described yield point elongation.
The present invention can be applied to a cold-rolled steel strip in which a wrinkle pattern caused by the yield phenomenon becomes a problem, and also to a strip of various metal materials. The target line can be applied to various surface treatment lines, refinement lines such as cutting, in addition to the pickling line.

[0024]

EXAMPLE In a continuous pickling line, a hot-rolled steel strip having a width of 1630 mm was rewound using the apparatus of the present invention as shown in FIG. 3, and after pickling, the occurrence of wrinkle patterns was observed. As a comparative example, rewinding was performed using a pressure roll having no backup roll. Table 1 shows the thickness of the hot-rolled steel strip, the roll diameter of the pressure roll, and the occurrence of wrinkle patterns.
According to the present invention, the wrinkle pattern can be stably made fine and inconspicuous.

In Table 1, the degree of occurrence of wrinkle patterns was as follows: ：: good after pickling and after coating. ：: good after pickling, only slightly observed after coating. ×: poor after pickling and after coating. It is.

[0026]

[Table 1]

[0027]

According to the present invention, in a continuous pickling line of a hot-rolled steel strip or the like, when a steel strip coil is unwound, the steel strip is caused to "bend", "fold" by a yield phenomenon of a steel material or the like. The wrinkle pattern called “crepe” can be stably and finely made inconspicuous by the present invention, and there is no problem in surface quality after coating. Therefore, a major problem in applying a thin hot-rolled steel strip to a field where a cold-rolled steel strip is conventionally used is solved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the method and apparatus of the present invention.

FIG. 2 is an explanatory diagram showing an example of a rewinding device to which the present invention is applied.

FIG. 3 is an explanatory view showing another example of the method and the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel strip coil 2, 3 ... Coil outer peripheral surface 4, 5 ... Steel strip 6 ... Payoff reel 7 ... Deflector roll 8 ... Pressure roll 9 ... Backup roll 10 ... Bearing block 11, 12 ... Link rod 13, 14 ... Arm 15 ... Movable beam 16 ... Fixed beam 17 ... Cylinder for pressure 18 ... Cylinder for balance 19 ... Cylinder for beam 20 ... Pinch roll

Claims (2)

[Claims] 1. A diameter of a steel strip coil having a diameter of 1 mm is fixed to a coil outer peripheral surface of a steel strip coil mounted on a payoff reel via a backup roll.
The pressure roll is contacted with a small-diameter pressure roll of 20 mm or less, and while the steel strip is bent and rewound by the pressure roll, the contact action causes the pressure roll to rotate about the fulcrum on the side opposite to the unwinding direction, and A method for rewinding a steel strip coil, wherein the steel strip coil is caused to follow the outer peripheral surface of the steel strip coil whose diameter is reduced. 2. A device in which a small-diameter pressure roll is brought into contact with the outer peripheral surface of a steel strip coil mounted on a pay-off reel, and the steel strip is bent and rewound by the pressure roll, wherein a backup roll is provided on the pressure roll.
A rotating mechanism for rotating the pressure roll and the backup roll on a side opposite to the unwinding direction as a fulcrum, and following a coil outer peripheral surface of the steel strip coil whose diameter is reduced as the unwinding is performed; And a roll contact mechanism for bringing the backup roll into contact with the outer peripheral surface of the coil, wherein the rotation mechanism is operated by the operation of the roll contact mechanism.