JP2001071027A - Coiling method for continuous strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a slip flaw of a strip surface, etc., and to obtain a coil having a good coiled shape by descending an upper roll with a cylinder mechanism to narrow a roll gap to a thickness wider than a strip thickness and bringing the upper roll into contact with a strip with a gear mechanism. SOLUTION: After an upper roll 15 is ascended/traversed by a cylinder 21, the upper roll 15 is descended by the cylinder 21, a roll gap between the upper roll and a lower roll 16 is narrowed to (t)+αwider than a strip thickness (t), successively, the upper roll 15 is brought into contact with a strip by a gear mechanism. The α is desirably set to several millimeters. The upper roll 15 is slowly brought into contact with the strip in running to prevent quality deterioration. Preferably, a peripheral speed of a pinch roll is set to v-β smaller than a strip running speed, backward tension is imparted to the strip, the gap adjustment is conducted by the gear mechanism against a setting electric current value (i) of a pinch roll drive motor is regulated in a range of i±Δi.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip hot rolling line and various other processing lines, wherein a continuous strip is alternately wound by two winders while being cut at the rear face of the line to form a coil. In doing so, the present invention relates to a winding method for preventing occurrence of slip flaws or the like on a strip surface and forming a coil having a good winding shape.

[0002]

2. Description of the Related Art In various processing lines such as a steel strip hot rolling line, a strip-shaped material to be processed is processed and then wound up at a rear surface of the line to form a coil. Usually, two winding machines are provided to alternately wind the strips sent one after another. In the continuous hot rolling line, which has recently begun to be adopted, the materials to be rolled are butt-joined in front of the finish rolling mill and finish-rolled including the joint, so that the winding machine at the rear of the line is continuous. Strips are sent. For this purpose, the continuous strip is alternately wound by two winders while being cut. 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 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 performed by applying a backward tension. This backward tension makes the winding shape of the coil favorable. When pinching the strip with a pinch roll,
Usually, the upper roll of the pinch roll is lowered by a cylinder to contact the strip. To apply backward tension, the pinch roll is rotated at a peripheral speed less than the rotational peripheral speed of the strip wound on the winder.

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.

[0005]

In the conventional strip winding, when the upper roll of the pinch roll is lowered by a cylinder and brought into contact with the strip, there is an unmatch between the running speed of the strip and the rotation speed of the pinch roll,
A sudden change in the winding tension occurs due to the mismatch between the roll gap and the strip thickness, which may lead to operation failures such as strip breakage, deterioration of the winding shape or breakage due to loop formation, and quality deterioration of the strip surface such as slip marks. May occur.

Further, if the pinch roll is excessively tightened by the cylinder, it may cause an operation trouble due to the meandering of the strip or the like and a deterioration of the surface quality. 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.

Therefore, the problem to be solved by the present invention is as follows:
In a hot strip rolling line for steel strip and other various processing lines, the continuous strip is cut at the rear face of the line while cutting.
In winding up alternately with the winder of the machine to make a coil,
An object of the present invention is to provide a coil having a good winding shape and excellent surface properties, while preventing the strip from being broken or folded and the winding shape from being deteriorated, and preventing the occurrence of slip flaws and the like on the strip surface.

[0008]

According to the method of the present invention for solving the above-mentioned problems, a strip cutting shear, a No. 1 pinch roll and a No. 1 winder are provided in a strip running direction.
While cutting the continuous strip at the winding line where No. 2 pinch roll and No. 2 winder are installed in order,
When winding with a No. 1 winder, pass through a No. 1 pinch roll,
No.1 pinch roll and N when winding with No.2 winder
o In the method of alternately winding on both winders through the 2 pinch rolls, the No. 1 pinch roll is changed from the state without offset to the offset state before starting winding on the No. 1 winder, and Before starting winding with the No. 2 winder, the upper roll of the No. 1 pinch roll was lifted and then moved laterally after the upper roll of the No. 1 pinch roll was moved from the offset state to the non-offset state. A method of winding a continuous strip, comprising lowering a roll to narrow a roll gap to t + α wider than a strip thickness t, and then bringing the upper roll into contact with the strip by a gear mechanism.

Then, after the upper roll of the No. 1 pinch roll is brought into contact with the strip, first, the rotational peripheral speed of the pinch roll is set to v-β smaller than the running speed v of the strip to apply rearward tension to the strip. After that, the current value of the drive motor of the pinch roll becomes i ± Δ centered on the set value i.
It is preferable to adjust the gap by the gear mechanism until the value is set within the range of i.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the subject of the present invention is a strip cutting shear 5, a No. 1 pinch roll 7, and a No. 1 winding in the running direction of a strip 1. In the winding line in which the No. 2 pinch roll 8 and the No. 2 winder 3 are sequentially installed, the continuous strip 1 is cut by the shear 5 and the No. 1 winder 2 This is a method in which the No. 2 winder 3 alternately winds. In FIG. 1, 4 is a No. 0 pinch roll, 6 is a pinch roll on a shearing-out side, 9, 10, and
11 is a side guide.

When the strip 1 is wound by the No. 1 winder 2 as shown by the solid line, it passes through the No. 1 pinch roll 7, and when the strip 1 is wound by the No. 2 winder 3 as shown by the broken line. Pass 1 pinch roll 7 and No. 2 pinch roll 8 through. Before the No. 1 pinch roll 7 is wound by the No. 1 winder 2, the leading end of the strip 1 is placed in an offset state shown by a solid line and the No. 1 winder 2
To be introduced. Before being wound by the No. 2 winder 3, the leading end of the strip 1 is guided in the direction of the No. 2 pinch roll 8 with no offset indicated by a broken line.

According to the method of the present invention, the No. 1 pinch roll 7 is changed from the state without offset to the state of offset,
Or, when making the state without offset from the state of offset, raise the upper roll of No. 1 pinch roll 7,
Then, after laterally moving, the upper roll is first lowered by a cylinder mechanism to narrow the roll gap to t + α wider than the strip thickness t, and then the upper roll is brought into contact with the strip 1 by a gear mechanism. .

In the example shown in FIG. 1, the leading end and the joining portion of the continuous strip 1 are tracked, and the leading end crop and each joining portion are cut by the shear 5 according to a command from the tracking device 13. Each pinch roll operates from the tracking device 13 via the gap control device 12. At this time, the thickness of the strip 1 is
4 and the gap between each pinch roll is adjusted based on the measured value. The thickness measurement position may be on the front side of the No. 0 pinch roll 4.

At the start of the operation, when the leading end of the strip 1 enters the No. 0 pinch roll 4, the No. 0 pinch roll 4 which has been opened so far is closed, the tip crop is cut by the shear 5, and the shear output side pinch roll is cut. 6 is closed and sent to No. 1 pinch roll 7. At this time, if the No. 1 pinch roll 7 is set in an offset state in advance, the leading end is first introduced into the No. 1 winder 2 and wound. If the No. 1 pinch roll 7 has no offset and the No. 2 pinch roll 8 has an offset state, the leading end is first introduced into the No. 2 winder 3 and wound. The roll gap of the No. 1 pinch roll 7 and the No. 2 pinch roll 8 is set to an appropriate value by the gap control device 12 based on the measurement value of the thickness gauge 14. Also, when closing the No. 0 pinch roll 4 and the shear output side pinch roll 6, the roll gap is narrowed to t + α wider than the strip thickness t by the cylinder mechanism.
Then, the upper roll is preferably brought into contact with the strip 1 by a gear mechanism.

According to the example shown in FIG.
o.1 A mechanism for moving the upper roll 15 of the pinch roll 7 will be described. The vertical movement of the upper roll 15 is performed by a cylinder mechanism and a gear mechanism. In the example of FIG. 2, as shown in FIG.
The bearing block 17 of No. 5 is supported by an upper roll support frame 18, and the upper roll support frame 18 is vertically moved 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.

The gear mechanism is composed of a worm wheel 22 and a worm 23. The axis of the worm wheel 22 is screwed into the fixed frame 19 on the lower side and 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 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 worm 23 is measured by the tachometers 28 and 29.
By controlling the rotation speed of the drive motor 27 by the current control device 30 together with the measured value of the thickness gauge 14, the vertical movement of the upper roll 15 can be finely adjusted.

In the method of the present invention, when the No. 1 pinch roll 7 is changed from the state without the offset to the state of the offset, or from the state of the offset to the state without the offset, as shown in FIG. After the upper roll 15 is raised at 21 and then moved laterally, the upper roll 15 is first lowered by the cylinder 21 so that the lower roll 16
Is narrowed to t + α wider than the strip thickness t, and then the upper roll 15 is brought into contact with the strip 1 by a gear mechanism. α is preferably several mm. When the cylinder 21 descends, the roll gap t + α
In order to stop the upper roll 15 at the position, the rotational position of the worm wheel 22 is adjusted in advance so that the roll gap when the upper roll 15 is lowered by the cylinder 21 becomes the strip thickness t + α.

According to the method of the present invention, since the upper roll 15 of the No. 1 pinch roll 7 comes into gradual contact with the running strip 1, abrupt fluctuation of the winding tension, breakage of the strip, and deterioration of the winding shape due to loop formation. Operational trouble such as meandering of the strip 1 due to breakage, folding, and excessive tightening of the pinch roll, and the possibility of quality deterioration such as occurrence of slip flaws on the strip surface are eliminated.

FIG. 3 shows a strip 1 according to the method of the invention.
Is first wound by No.1 winder 2 and the joint is cut.
No. 2 winder 3, a shear 5, a No. 1 pinch roll 7, a No. 1 winder 2, a No. 2 pinch roll 8, and a No. 2 4 shows an operation flow of the winder 3. A solid line indicates a state where the strip 1 is present, and a broken line indicates a state where the strip 1 is not present. Asterisks indicate repetition, and return from the lower * to the upper * and repeat.

When the No. 1 pinch roll 7 and the No. 2 pinch roll 8 are set in an offset state in advance and cut at the tip with the shear 5, the strip 1 is transferred to the No. 1 winder 2 by the No. 1 pinch roll 7. After being introduced, winding is started, and the No. 1 pinch roll 7 is brought into a state without offset before cutting the joint. Then, the leading end after cutting the joint passes through the No. 1 pinch roll 7 and the No. 2 winder 3 with the No. 2 pinch roll 8.
And the winding is started, and the No. 1 winding machine 2 ends the winding. Then, the No. 1 pinch roll 7 is set in an offset state before cutting the joint. Then, the leading end after cutting the joint is introduced into the No. 1 winder 2 by the No. 1 pinch roll 7 to start winding, and the No. 2 winder 3 ends winding. Thereafter, before cutting the joint, the No. 1 pinch roll 7 is set to a state without offset, and the above operation is repeated.

Next, in the method of the present invention, after the upper roll 15 of the No. 1 pinch roll 7 is brought into contact with the strip 1, first, the rotational peripheral speed of the pinch roll 7 is set to v− smaller than the running speed v of the strip 1. After applying a rearward tension to the strip 1 with β, the gap adjustment is performed by the gear mechanism until the current value of the drive motor of the pinch roll 7 stabilizes in a range of i ± Δi around the set value i. preferable.

The upper roll 15 and the lower roll 16 are each driven to rotate by a roll driving motor, and the number of roll rotations is detected by a tachometer. After the upper roll 15 is brought into contact with the strip 1 and sandwiched between the lower roll 16 as described above, when adjusting to a v-β smaller than the traveling speed v of the strip 1, each of the rolls 15 and 16 Reduce the rotation speed and use the motor on the generator side,
The gap adjustment is performed by the gear mechanism including the worm wheel 22 and the worm 23 in FIG. 2 until the generated current value falls within the range of the predetermined current value i ± Δi. At this time, when the current value is higher than i ± Δi, the adjustment is performed in a direction to narrow the roll gap, and when the current value is lower than i ± Δi, the adjustment is performed in a direction to widen the roll gap.

According to this preferred method, an appropriate tension is always applied to the strip 1 even when there is a disturbance such as wear of the No. 1 pinch roll 7 or fluctuation in the thickness of the strip 1. 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.

[0025]

EXAMPLE In a steel strip hot rolling line, after rough rolling,
The trailing end of the preceding material and the leading end of the succeeding material were butt-joined by laser welding, and the continuous strip in which the weld was also rolled by finish rolling was cut and wound at the weld by the method of the present invention to form a coil. Winding was performed by the equipment shown in FIGS. 1 and 2 according to the flow shown in FIG. When changing the No. 1 pinch roll 7 to the state without offset and when changing to the state of offset, before the upper roll 1
The rotation position of the worm wheel 22 was adjusted so that the roll gap when the number 5 was lowered was the strip thickness t + 3 mm. Then, the upper roll 1 is
5 is moved away from the strip 1 and moved laterally. First, the upper roll 15 is lowered by the cylinder 21 to narrow the roll gap to the strip thickness +3 mm, and then the worm wheel 22 is rotated to rotate the upper roll 15. Was brought into contact with the strip 1.

After contact, the upper roll 15 and the lower roll 16
Is set to a speed lower than the running speed of the strip 1 and a rearward tension is applied to the strip 1, and then the current value of the pinch roll drive motor is set to i ±
The gap was adjusted by the worm wheel 22 until the value was set within the range of Δi. As a result, there is no operation trouble due to the tip of the strip being caught, etc., and a coil having a good winding shape can be obtained stably and reliably. No outbreaks were noted. Further, there is no problem even when strips having different thicknesses and widths are continuous.

[0027]

According to the method of the present invention, in a steel strip hot rolling line and other various processing lines, continuous strips are alternately wound into coils by two winding machines while being cut at the rear surface of the line. In this case, the risk of trouble caused by the tip of the strip is avoided, and no slip flaws are generated on the strip surface, and a coil having a good winding shape can be stably and reliably obtained. Even if strips having different thicknesses and widths are continuous, there is no problem, which contributes to improvement of production efficiency and improvement of production 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.

FIGS. 2A and 2B are explanatory views showing an example of a roll pressing mechanism for carrying out the method of the present invention.

FIG. 3 is a flowchart of the steps in the method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Strip 2 ... No.1 winder 3 ... No.2 winder 4 ... No.0 pinch roll 5 ... Shear 6 ... Shear output side pinch roll 7 ... No.1 pinch roll 8 ... No.2 pinch roll 9, 10, 11 ... side guide 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 ... Warm wheel 23 ... Warm 24 ... Support rod 25,26 ... Bevel gear 27 ... Drive motor 28,29 ... Tachometer 30 ... Current control device

Claims (2)

[Claims] 1. A strip cutting shear, a No. 1 pinch roll and a No. 1 winder in a strip running direction,
While cutting the continuous strip at the winding line where No. 2 pinch roll and No. 2 winder are installed in order,
When winding with a No. 1 winder, pass through a No. 1 pinch roll,
No.1 pinch roll and N when winding with No.2 winder
o In the method of alternately winding on both winders through the two pinch rolls, the No. 1 pinch roll is changed from the state without offset to the offset state before starting winding on the No. 1 winder, and N
o.2 In order to change from the offset state to the offset-less state before starting winding with the winder, raise the upper roll of the No. 1 pinch roll, then move it laterally, A method of winding a continuous strip, comprising lowering a roll to narrow a roll gap to t + α wider than a strip thickness t, and then contacting the upper roll with the strip by a gear mechanism. 2. After the upper roll of the No. 1 pinch roll is brought into contact with the strip, first, the rotational peripheral speed of the pinch roll is set to v-β smaller than the running speed v of the strip to apply a rearward tension to the strip. 2. The continuity according to claim 1, wherein the gear mechanism adjusts the gap until the current value of the drive motor of the pinch roll stabilizes in a range of i ± Δi around the set value i. How to wind the strip.