JP2001071026A - Coiling method for strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a slit flaw of a strip surface, deterioration of a coiled shaped, etc., due to a pinch roll by narrowing a roll gap down to a thickness wider than a strip thickness with a cylinder mechanism and bringing a roll into contact with the strip with a gear mechanism. SOLUTION: Preferably, a peripheral speed of a pinch roll is set to (v)-β smaller than a running seed (v) of a strip, backward tension is imparted to the strip, gap adjustment is conducted by a gear mechanism until the electric current value of a pinch roll drive motor is regulated in a range of i±Δi for a set value (i). In the case of pinching by No.0 pinch roll 4 and pinching in off-setting change of No.1 pinch roll 6. A roll gap is narrowed down to t+α wider than a thickness (t) of the strip 1 by descending an upper roll 15 with a roll elevation mechanism 11, successively, the upper roll 15 is brought into contact with the strip 1 by the gear mechanism. The upper roll 15 of No.0/No.6 pinch rolls 4, 6 slowly brought into contact with the running strip 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot rolling line for steel strips and various other processing lines, which prevents the occurrence of slip flaws and the like on the surface of a strip when winding a strip on the rear surface of the line. The present invention relates to a winding method for forming a coil having a shape.

[0002]

2. Description of the Related Art In various processing lines such as a steel strip hot rolling line, after a strip-shaped material to be processed is processed, it is wound into a coil by a winding facility at a rear surface of the line. Since the wound coil is sent to the next step to be subjected to another processing or shipped as a product, it is necessary to form a coil having a good wound shape without slip flaws on the strip surface. .

[0003] In the winding, the leading end of the strip is guided to a winder, the mandrel of the winder is bitten, the mandrel is rotated, and the strip is pinched by a pinch roll provided on the entrance side of the winder. (This is called pinching). The rotation speed of the pinch roll is adjusted, and a backward tension is applied to the coil being wound, thereby improving the winding shape of the coil. In a normal line, two winders are installed because strips are sent one after another,
On the other hand, while taking out the wound coil,
On the other hand, the next strip winding operation is performed.

In such a strip winding apparatus, the pinch roll has a role of applying a rear tension to the strip, and the pinch rolls of the two front winders provided with the pinch roll have a function of reducing the length of the incoming strip. It has the role of changing the direction of movement of the tip. When the roll is introduced into the front-side winder, the roll is offset and the traveling direction is bent, and when the roll is fed to the front-side winder, there is no offset. When changing from the offset state to the state without the offset and vice versa, the roll gap is opened and one roll is moved in parallel with the strip, and then the gap is closed and pinched.

A conventional winding method is disclosed in Japanese Patent Application Laid-Open No. 60-18 / 1985.
In Japanese Patent No. 4420, the roll gap between a pair of upper and lower pinch rolls provided on the winding machine entrance side is set to a predetermined material sandwiching interval at the time of starting winding, and the material top portion (head) is wound. After the coil is wound several times, the upper pinch roll is moved to a position where it does not come into contact with the material, and after the material bottom (tail) passes through the rolling mill, the upper pinch roll is returned to the material clamping interval. It is disclosed that by doing so, the contact time of the pinch roll is shortened, and the effects of extending the life of the pinch roll, stabilizing the coil winding appearance, deteriorating the shape of the rolled material surface, and reducing the number of press flaws are disclosed.

[0006]

In a conventional strip winding apparatus, when pinching a strip with a pinch roll, the roll is usually moved by a cylinder to contact the strip and tighten it. At this time, in order to apply rearward tension to the strip being wound, the roll is rotated at a peripheral speed smaller than the rotational peripheral speed of the strip wound on the winder. When the pinch roll is suddenly brought into contact with the strip by the cylinder, a sudden change in the winding tension occurs due to a mismatch between the running speed of the strip and the rotation speed of the pinch roll, and a mismatch between the roll gap and the thickness of the strip. Operation failure such as deterioration or winding of the winding shape due to breakage or loop formation, or deterioration of coil quality may occur.

[0007] If the pinch roll is excessively tightened by the cylinder, the operation may be impaired due to the meandering of the strip and the quality of the coil may be deteriorated. Further, due to disturbances such as abrasion of the pinch rolls and fluctuations in the thickness of the strip, there may be cases where an appropriate backward tension cannot be applied to the strip, and there is a risk that the winding shape of the coil deteriorates due to insufficient tension, and the plate breaks due to excessive tension. The technique disclosed in the above publication does not solve these problems.

The problem to be solved by the present invention is
To prevent the occurrence of slip flaws on the strip surface due to pinch rolls and the deterioration of the coil winding shape when the strip is wound by the wind-up equipment on the rear side of the steel strip at the hot strip rolling line and other various processing lines. It is.

[0009]

According to a first aspect of the present invention, there is provided a strip winding apparatus, wherein a strip passing through a roll gap of a pinch roll is narrowed by reducing the roll gap. In pinching, the roll gap is first narrowed by moving the roll by a cylinder mechanism to t + α wider than the strip thickness t, and then the roll is moved by a gear mechanism to contact the strip. How to take.

In a second aspect of the present invention, in the strip winding apparatus, when the strip passing through the roll gap of the pinch roll is pinched by narrowing the roll gap, the rotational peripheral speed of the pinch roll is changed to the running speed of the strip. After applying a back tension to the strip with v-β smaller than v, the current value of the pinch roll drive motor is changed to the set value i.
The gap is adjusted by moving the roll by a gear mechanism until the gap is set within the range of i ± Δi centered at the center of the strip.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The winding method of the present invention is carried out, for example, in a winding facility as shown in FIG. The strip 1 is sent from a rolling mill or the like (not shown), passes through the roll gap of the No. 0 pinch roll 4, is transported on the transport table 5, and the No. 1 pinch roll 6 is in an offset state as shown by a solid line. In this case, the leading end of the strip 1 is turned obliquely downward, introduced into the winder 2, wound around the mandrel 3 and wound. The tip of strip 1 is No.0 pinch roll 4
After passing through the roll gap, the roll gap is narrowed, and the strip 1 is pinched by the No. 0 pinch roll 4.

Before the winding by the winding machine 2 is completed, No. 1
The pinch roll 6 is set in a state without offset as shown by a broken line, and after the winding is completed, the leading end of the next strip 1 is introduced into a winding machine (not shown) through a No. 2 pinch roll 7 as shown by a broken line. Then, the coil of the winder 2 is removed, and the No. 1 pinch roll 6 is offset as shown by the solid line to prepare for winding of the next strip.

When the No. 1 pinch roll 6 is changed from the offset state to the state without the offset, or when the pinch roll 6 is changed from the state without the offset to the offset state, the upper roll 1
5 is raised and moved laterally away from the strip 1 and then lowered to contact and pinch the strip. After the winding is completed, the coil is removed by the time the next strip is sent, and only one winding machine may be used in a line where the preparation for winding is completed.
The pinch roll 6 can be operated in the offset state.

In the example of FIG. 1, during winding, the strip 1 is pinched by the No. 0 pinch roll 4, and the upper roll 15 and the lower roll 16 of the No. 0 pinch roll 4 are set at a lower speed than the running speed of the strip 1. By applying rotational driving at a peripheral speed of, a rear tension is applied to the coil. Note that the rotational tension of the No. 1 pinch roll 6 or the No. 2 pinch roll 7 may be adjusted to apply rear tension. Pinching is performed by lowering the upper roll 15 after the leading end of the strip 1 passes through the roll gap and is wound on a winder.

According to the first invention method of the present invention, in pinching by the No. 0 pinch roll 4 and pinching when the offset of the No. 1 pinch roll 6 is changed, first, the roll gap is made wider than the strip thickness t. The roll is moved and narrowed by the cylinder mechanism until t + α, and then the roll is moved by the gear mechanism to contact the strip.
In the example of FIG. 1, the upper roll 15 of the No. 0 pinch roll 4 is lowered by the roll lifting mechanism 11 to perform pinching.

The roll lifting mechanism 11 will be described with reference to an example shown in FIG. The upper roll 15 is moved up and down by a cylinder mechanism and a gear mechanism. In the example of FIG. 2, the bearing block 17 of the upper roll 15 is mounted on the upper roll support frame 1 as shown in FIG.
8, the upper roll support frame 18 is moved up and down by cylinders 21 and gear mechanisms provided at both ends.
The lateral movement of the upper roll 15 can be performed by moving the support frame 18 in a direction perpendicular to the paper surface by a mechanism (not shown).

The cylinder 21 is supported by a fixed portion (not shown), the cylinder rod slides through the fixed frame 19, and the tip of the cylinder rod is
8. When the cylinder rod is moved up and down by air pressure or the like, the upper roll support frame 18 moves up and down, and the upper roll 15 moves up and down accordingly.

The gear mechanism is composed of a worm wheel 22 and a worm 23. The axis of the worm wheel 22 is screwed to the fixed frame 19 on the lower side and is in contact with the movable frame 20 on the upper side. When the worm wheel 22 is rotated, the movable frame 20 moves up and down, and the upper roll support frame 1 connected by a support rod 24 that slides through the fixed frame 19.
8 moves up and down, and as the upper roll 15 moves up and down.
As shown in (a), the worm wheel 22 is rotated by the worm 23 from the drive motor 27 via bevel gears 25 and 26. Then, the rotation speed of the worm 23 is measured by the tachometers 28 and 29, and the rotation of the drive motor 27 is controlled by the current control device 30 in combination with the measurement value of the thickness gauge 14, thereby raising and lowering the upper roll 15. Can be fine-tuned.

In the first method, when the upper roll 15 is stopped at the position of the roll gap t + α when the cylinder 21 descends, the upper roll
The rotational position of the worm wheel 22 is adjusted in advance so that the roll gap when 5 is lowered becomes the strip thickness t + α. Thereafter, the upper roll 15 is raised by the cylinder 21. At the time of pinching, first, the upper roll 15 is lowered by the cylinder 21, the upper roll 15 is stopped at the position where the roll gap is t + α, the gear mechanism is operated, and the worm wheel 22 is driven by the drive motor 27.
Is rotated, and the upper roll 15 is lowered to contact the strip 1. α is preferably several mm.

According to the first invention method, No. 0 as shown in the example of FIG.
Since the upper roll 15 of the pinch roll 4 or the No. 1 pinch roll 6 gently comes into contact with the running strip 1, abrupt fluctuation of the winding tension, breakage of the strip, deterioration or folding of the winding shape due to loop formation, Operational troubles such as meandering of the strip 1 due to excessive tightening of the pinch roll, and the risk of quality deterioration such as occurrence of slip flaws on the strip surface are eliminated. In the first invention method, when a backward tension is applied to the strip 1 as in the above-mentioned No. 0 pinch roll 4,
The upper roll 15 and the lower roll 16 are rotated by the roll drive motor 8 shown in FIG. 1 and pinched, and then adjusted to v-β smaller than the traveling speed v of the strip 1.

According to the second invention, the pinch roll 4 has a smaller rotating peripheral speed than the strip running speed v in pinching with the No. 0 pinch roll 4 and pinching when the No. 1 pinch roll 6 is changed in offset. After applying a back tension to the strip with v-β, the roll mechanism is moved by the gear mechanism to adjust the gap until the current value of the pinch roll drive motor stabilizes in the range of i ± Δi centering on the set value i. Do. In the example of FIG. 1, No. 0 pinch roll 4
The upper roll 15 and the lower roll 16 are each driven to rotate by a drive motor 8, and the rotation speed thereof is detected by a rotation speed detector 9.

After the upper roll 15 is brought into contact with the strip 1 and pinched with the lower roll 16 as described above, when adjusting to a speed v-β smaller than the running speed v of the strip 1, each roll 15 and The motor is used on the generator side with the rotation speed of the gear mechanism 16 reduced, and the gear mechanism 1 is driven until the generated current value falls within a range of a predetermined current value i ± Δi.
5, the gap is adjusted. At this time, the current value is i ±
If it is higher than Δi, the worm wheel 22 is moved to the upper roll 1
5 in the ascending direction, and in the descending direction if lower than i ± Δi,
Adjust each.

According to the second invention, an appropriate tension is always applied to the strip 1 even when there is disturbance such as wear of the pinch roll or fluctuation of the thickness of the strip. Therefore, the risk of deterioration of the winding shape of the coil due to insufficient tension and breakage of the plate due to excessive tension are eliminated.

[0024]

According to the method of the present invention, in the hot rolling line for steel strips and other various processing lines, when the strip is wound on the rear surface of the line, there is no occurrence of slip flaws and the like on the strip surface and the winding shape is good. Can be obtained stably and reliably, contributing to an improvement in production efficiency and an increase in manufacturing yield.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a winding device for carrying out the method of the present invention.

FIG. 2 is an explanatory view showing an example of a roll elevating mechanism for carrying out the method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Strip 2 ... Winding machine 3 ... Mandrel 4 ... No. 0 pinch roll 5 ... Transport table 6 ... No. 1 pinch roll 7 ... No. 2 pinch roll 8 ... Roll drive motor 9 ... Rotation speed detector 10 ... Roll Drive control device 11 Roll elevating mechanism 12 Gap control device 13 Tracking device 14 Thickness gauge 15 Upper roll 16 Lower roll 17 Bearing block 18 Upper roll support frame 19 Fixed frame 20 Adjustment frame 21 ... Cylinder 22 ... Worm wheel 23 ... Worm 24 ... Support rod 25,26 ... Bevel gear 27 ... Gear drive motor 28,29 ... Tachometer 30 ... Current control device

Claims (2)

[Claims] 1. In a strip winding apparatus, when a strip passing through a roll gap of a pinch roll is pinched by narrowing the roll gap, the roll gap is first reduced to a cylinder t + α wider than the strip thickness t. A method for winding a strip, comprising: moving a roll by a mechanism to narrow the roll; and then moving the roll by a gear mechanism to contact the strip. 2. In a strip winding apparatus, when a strip passing through a roll gap of a pinch roll is pinched by narrowing the roll gap, the rotation peripheral speed of the pinch roll is smaller than the traveling speed v of the strip. After applying a back tension to the strip with v-β, the gap is adjusted by moving the roll by the gear mechanism until the current value of the pinch roll drive motor is settled in the range of i ± Δi centering on the set value i. A method for winding a strip, comprising the steps of: