JP2001150022A - Winding method for steel strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for winding steel strip that prevents marks in the strop and wear in a mandrel and wrapping rollers as far as possible and speed up tightening of the winding. SOLUTION: At the first turn of the winding, wrapping rollers, the first - the third wrapping rollers 6a-6c, which are placed around an expandable and contractible mandrel 5 at an equal interval, hole and wind a strip 2. The rollers 6a to 6c successively press the strip 2 at a constant pressure as soon as the edge of the strip is rolled-in and the rollers in the upper reaches successively loosen the pressures as the roller in the lowest reach begins to press the strip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding method for winding a steel strip such as a strip which has been rolled into a coil.

[0002]

2. Description of the Related Art Conventionally, as a coiling device (coiler) for winding a steel strip such as a strip which has been rolled by a rolling mill of a rolling facility and running on a hot run table in a coil shape, as shown in FIGS. There is.

[0003] Fig. 6 shows a strip 102 which is deflected by a pinch roll 100 and guided by a throat guide 101, first of all, a mandrel 103 in a reduced diameter state.
Are wound around three wrapper rolls (unit rolls) 104a to 104c and a circular arc guide (not shown). Then, while winding 7 to 10 times, the mandrel 103
The wrapper rolls 104a-
104c is opened (large retreat), and winding is continued thereafter.

On the other hand, in FIG. 7, a strip 102 diverted by a pinch roll 100 and guided by a throat guide 101 first has a predetermined standby gap with a mandrel 103 in a reduced diameter state. The wrapper rolls 104a-104c lead only and are wound once. And the wrapper roll 104 from the second winding
a to 104c are simultaneously pressed (advanced) and the strip 102 is wound between the mandrel 103 and the wrapper rolls 104a to 104c, then wound about three times, and then the mandrel 103 starts to expand in diameter to support the coil while the wrapper roll 104a. .About.104c is released (largely retracted) from about the sixth winding, and thereafter winding is continued.

[0005]

However, in the former case, the wrapper rolls 104a to 104c are connected to the strip 1
02, that is, the wrapper rolls 104a-
Since the strip 102 can be wound without sandwiching the strip 102 between the mandrel 104c and the mandrel 103, there is an advantage that plate flaws such as a top end mark, a mandrel segment mark, and a flaw are not easily formed. The diameter when tightening is unstable, and the mandrel 103
Even if the diameter is increased to the maximum, there is a problem in that the coil does not slip and is not tightened, and a coil with a defective winding shape is generated. In addition, since the number of windings until the winding is tightened is large, there is a drawback that the chances of occurrence of flaws are increased.

On the other hand, in the latter case, the wrapper roll 10
4a-104c against strip 102, i.e., wrapper rolls 104a-104c and mandrel 10
3, the coil 102 is wound with the strip 102 interposed therebetween, so that the amount of loosening of the coil can be predicted in advance, and there is no problem that the diameter when the mandrel 103 expands and tightens on the coil becomes unstable as in the former case. The above-mentioned various flaws are likely to be formed by the pressing of the roll, and the mandrel 103 and the wrapper rolls 104a to 104c are liable to be worn by friction with the strip 102. Further, similarly to the former, the number of windings until the winding is tightened is large, in other words, the pressing time of the wrapper rolls 104a to 104c is long, so that the generation of the various plate flaws is further promoted, and the vibration and noise are disadvantageously large. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a steel strip capable of speeding up tightening while preventing the occurrence of plate flaws and wear of the mandrel and wrapper roll as much as possible. To provide a winding method.

[0008]

In order to achieve the above object, a method for winding a steel strip according to the present invention is provided. The method for winding a steel strip is supported by a plurality of wrapper rolls equally arranged around a mandrel which can be expanded and contracted. In the winding method in which the initial winding is performed, the plurality of wrapper rolls are sequentially pressed as soon as the tip of the steel strip enters, at the time of the first winding, while the upstream side is pressed when the downstream wrapper roll is pressed. The pressing of the side wrapper roll is sequentially stopped.

Further, in a winding method in which an initial winding of a steel strip is carried out by being supported by a plurality of wrapper rolls equally arranged around a mandrel which can be expanded and contracted, a first winding is performed. In addition, only the most downstream wrapper roll is pressed as soon as the tip of the steel strip enters, while the other wrapper rolls are not pressed.

[0010] In addition, in a winding method in which an initial winding of a steel strip is performed by being supported by a plurality of wrapper rolls evenly arranged around a mandrel that can be expanded and contracted, a first winding is performed. Meanwhile, in the most downstream side and several downstream wrapper rolls continuous with this, while the steel strip tip is sequentially pressed as soon as it enters, the pressing of the upstream wrapper roll is sequentially stopped at the time of pressing the downstream wrapper roll. It is characterized in that the upstream wrapper roll does not press.

The wrapper roll is opened when the mandrel expands to a perfect circle.

The standby diameter of the mandrel is such that the steel strip can be loosened when it is expanded to a perfect circle.

Further, the lead rate of the mandrel is characterized in that the slack of the first layer can be obtained by rotating the mandrel at an angle from the most downstream wrapper roll to the most upstream wrapper roll.

Further, the lead rate of the plurality of wrapper rolls is characterized in that the steel strip under the wrapper rolls is pressed and idling from the time when the steel strips have two layers.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for winding a steel strip according to the present invention will be described in detail with reference to the drawings with reference to embodiments.

[Embodiment] FIG. 1 is a side view schematically showing the construction of a winding device according to an embodiment of the present invention, FIG. 2 is a side view around a mandrel showing a standby state in the winding procedure, and FIG. FIG. 7A shows a state of the first winding in the winding procedure, in which FIG. 7A is a side view around the mandrel when the leading end of the strip passes through the first wrapper roll, and FIG. Side view around the mandrel when passing through the wrapper roll,
FIG. 4C is a side view around the mandrel when the leading end of the strip passes through the third wrapper roll. FIG. 4 shows a state of the second winding in the same winding procedure, and FIG. FIG. 4B is a side view around the mandrel when the leading end of the strip passes through the first wrapper roll, and FIG. 4B is a side view around the mandrel when the leading end of the strip passes through the second wrapper roll;
FIG. 5 is a side view around the mandrel when the leading end of the strip passes through the third wrapper roll, and FIG. 5 is a side view around the mandrel showing an N-turn state in the winding procedure.

As shown in FIG. 1, a strip 2 as a steel strip which has been rolled by a finishing mill (not shown) of a hot rolling facility and has traveled on a hot run table 1 has a predetermined offset angle θ between upper and lower rolls. And is guided by the throat guide 4 and wound around the mandrel 5 in a coil shape.

The mandrel 5 has four segments 5a.
-5d, and the outer diameter thereof can be expanded and reduced by an expansion and contraction mechanism (not shown). Also, around the mandrel 5, first to third wrapper rolls (unit rolls) 6a to 6
c are arranged at equal intervals together with the arc-shaped mandrel guides 7a to 7b.

The first to third wrapper rolls 6a to 6c
The above-mentioned pressing operation, opening operation and quick open control operation can be individually performed by an actuator (hydraulic cylinder) not shown.

The pinch roll 3 and the mandrel 5
The first to third wrapper rolls 6a to 6c are individually rotatable by a motor (not shown) at a predetermined lead rate based on the strip speed on the exit side of the finishing mill. In FIG. 1, reference numeral 8 denotes a side guide.

With such a configuration, the expanding / contracting operation of the mandrel 5 and the advancing / retracting operation of the first to third wrapper rolls 6a to 6c are performed at predetermined timings according to the winding procedure shown in FIGS. .

First, FIG. 2 shows a standby state. According to this, the gap G1 between the _first to third wrapper rolls 6a to 6c.
~G ₃ is noise, for wear reduction, mandrel 5 (segment 5a to 5d) and the first to third trumpet roll 6a~6
The thickness is set to −plate thickness (0 <α <plate thickness) so that c does not directly contact. On the other hand, the mandrel guides 7a to 7b
The gap Δr of
The mandrel 5 is approached with as little pressure as possible.

The lead rate of the mandrel 5 is 20
%, And the lead rates of the first to third wrapper rolls 6a to 6c are also set in order to prevent abrasion after pinching.
To the lead rate.

Further, the standby diameter (initial diameter) of the mandrel 5
Is set to a standby diameter (for example, about 760 mm) such that the remaining slack of the first layer described later can be removed when the circle is enlarged to a perfect circle (for example, about 762 mm).

Next, FIG. 3 shows a state of the first winding. According to this, the tip of the strip 2 is the first wrapper roll 6a.
Immediately after detecting that the first wrapper roll 6a has passed (see FIG. 3A), the first wrapper roll 6a is pressed at a constant pressure.

Thus, the slack of the strip 2 between the pinch roll 3 and the first wrapper roll 6a is reduced (absorbed). Note that the load at this time draws in the slack, and after absorbing the slack, the strip 2, the mandrel 5, and the first wrapper roll 6a do not slip and cause necking on the upstream side, and vibration, noise, and abrasion are allowable values. (For example, 2 to 5 tf / m).

Thereafter, immediately after detecting that the leading end of the strip 2 has passed through the second wrapper roll 6b (see FIG. 3B), the second wrapper roll 6b is maintained at a constant pressure (same as the first wrapper roll 6a). When pressed in) a gap G ₁ of the first trumpet roll 6a simultaneously a pressing force with spread in the thickness of about zero. Further, the first wrapper roll 6a is idled to apply a brake for mechanical resistance.

As a result, the first wrapper roll 6a and the second
The slack of the strip 2 between the wrapper rolls 6b is reduced, and the first wrapper roll 6a can apply a rearward tension corresponding to the frictional force of the strip centrifugal force to the strip 2.

Thereafter, immediately after detecting that the leading end of the strip 2 has passed through the third wrapper roll 6c (see FIG. 3C), the third wrapper roll 6c is maintained at a constant pressure (same as the first wrapper roll 6a). pressing the gap G ₂ of the second wrapper roll 6b simultaneously) to the pressing force with spread in the thickness of about zero. Also, the second wrapper roll 6b is idled to apply a brake for mechanical resistance.

As a result, the second wrapper roll 6b applies a backward tension corresponding to the frictional force of the strip centrifugal force to the strip 2, so that the slack of the strip 2 between the second wrapper roll 6b and the third wrapper roll 6c is reduced.

Next, FIG. 4 shows a state of the second winding. According to this, the tip of the strip 2 is the first wrapper roll 6a.
Immediately before passing through, the first wrapper roll 6a jumps to the plate thickness + α by the quick open control, and after being passed (see FIG. 3A), is pressed at a constant pressure. Also,
The lead ratio setting of the first wrapper roll 6a is idling.

As a result, the top end mark at the beginning of the second layer is eliminated, and μsm (the coefficient of friction between the mandrel and the strip)> μss (the coefficient of friction between the strip and the strip). Is in a state where the stick and the interlayer are almost slip,
The third wrapper roll 6c and the first wrapper roll 6a little by little
The looseness created between them is absorbed. Ideally, the slack is absorbed in this section (mandrel 1/3 rotation) due to the lead rate (20%) of the mandrel 5 described above. In addition, the idling of the first wrapper roll 6a prevents the outer layer from getting into the outer layer and prevents the outer layer from becoming loose.

Then, immediately before the leading end of the strip 2 passes through the second wrapper roll 6b, the second wrapper roll 6
b jumps to the plate thickness + α by the quick open control, and after being passed (see FIG. 13B), is pressed at a constant pressure. Further, the lead ratio setting of the second wrapper roll 6b is idling. In addition, the mandrel 5 lead rate is 2
It can be reduced from 0% to 10%.

Thus, as in the case of the first wrapper roll 6a, the top end mark at the beginning of the second layer is eliminated, and the remaining slack is absorbed little by little. In addition, the idling of the second wrapper roll 6b prevents the outer layer from sneaking in, preventing the outer layer from being loosened, and the lead rate of the mandrel 5 prevents necking when the subsequent tightening occurs. Be avoided.

Thereafter, immediately before the leading end of the strip 2 passes through the third wrapper roll 6c, the third wrapper roll 6
“c” jumps to the thickness + α by the quick open control, and after being passed (see FIG. 9C), is pressed at a constant pressure. Also, the setting of the lead rate of the third wrapper roll 6c is idling.

Thus, as in the case of the first wrapper roll 6a, the top end mark at the beginning of the second layer disappears, and the remaining slack is gradually absorbed. In addition, the idling of the third wrapper roll 6c prevents the outer layer from sinking in and prevents the outer layer from loosening.

In this embodiment, as shown in FIG. 5, the mandrel 5 starts to be enlarged from around 1.9 turns. The enlargement speed is a speed at which the diameter is enlarged by 2 mm (760 mm → 762 mm) during the movement of 1/3 turn (the end of the strip is the third wrapper roll 6c → the first wrapper roll 6a).

As a result, the aforementioned slack is removed, the winding is tightened, the winding tension is raised, the mandrel current is increased, and the LOAD is reduced.
An ON determination is made, and the first to third wrapper rolls 6a to 6c can be opened. At this time, the first to third wrapper rolls 6a to 6c are sequentially opened before the leading end of the strip 2 passes through the wrapper roll in order to ensure safety (prevent unwinding) when the wrapper roll is opened with a small number of windings.

As described above, in this embodiment, since the pressing time of the first to third wrapper rolls 6a to 6c is short and the load is low, vibration, noise, and wear (segment, wrapper roll) are greatly reduced. Be improved.

Further, the amount of slack in the first layer (which is determined by Δr) can be reduced to 1/3 (the amount of slack between the third wrapper roll 6c and the first wrapper roll 6a) as compared with the conventional case,
Since the winding tension is generated early and the tension is increased, the tightening of the inner layer is improved, and the inner layer telescope is reduced.

The occurrence timing of the winding tension is predicted within a predetermined time, and necking can be prevented by restricting the lead (10%) of the mandrel 5 before that.

The present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the first winding, if the lead rate of the mandrel 5 is sufficiently high, the first
The constant pressure pressing of the wrapper roll 6a or the first wrapper roll 6a and the second wrapper roll 6b may be omitted.

[0043]

As described in detail above, the method for winding a steel strip according to the first aspect of the present invention comprises supporting a plurality of wrapper rolls evenly arranged around a mandrel which can be expanded and contracted. In the winding method in which the initial winding of the steel strip is performed, the plurality of wrapper rolls are sequentially pressed as soon as the tip of the steel strip enters, during the first winding, while the downstream wrapper roll is Since the pressing of the upstream wrapper roll is stopped sequentially during pressing, the pressing time of the wrapper roll is short, and vibration, noise, wear (segment,
Wrapper roll) is greatly improved. Further, the amount of slack in the first layer can be reduced to 1/3 of the conventional one, and the winding tension is generated early and the tension is increased, so that the tightness of the inner layer is improved and the inner layer telescope is reduced. In addition, the generation timing of the winding tension is predicted within a predetermined time, and necking can be prevented by restricting the lead of the mandrel before that.

According to a second aspect of the present invention, there is provided a method of winding a steel strip, wherein the steel strip is initially wound by being supported by a plurality of wrapper rolls equally distributed around a mandrel which can be expanded and contracted. In the winding method, when the first winding,
Since only the most downstream wrapper roll presses as soon as the tip of the steel strip enters, the other wrapper rolls do not press, so that the same operation and effect as in claim 1 can be obtained.

According to a third aspect of the present invention, there is provided a method of winding a steel strip, wherein the steel strip is supported by a plurality of wrapper rolls equally distributed around a scalable mandrel to perform an initial winding of the steel strip. In the winding method, when the first winding,
In the most downstream side and several downstream wrapper rolls continuous with this, while the steel strip tip is sequentially pressed as soon as it enters, when the downstream wrapper roll is pressed, the pressing of the upstream wrapper roll is sequentially stopped, and the other upstream wrapper rolls are pressed. Since the wrapper roll does not perform pressing, the same operation and effect as those of the first aspect can be obtained.

The steel strip winding method according to claim 4 of the present invention is characterized in that the wrapper roll is opened when the mandrel expands to a perfect circle, so that the long section at the stage when the number of windings is increased. Over the segment mark.

In the method for winding a steel strip according to a fifth aspect of the present invention, the standby diameter of the mandrel is a diameter such that the steel strip can be loosened when expanded to a perfect circle. It is the timing to release the wrapper roll when it is a perfect circle.

According to a sixth aspect of the present invention, in the method for winding a steel strip, the lead rate of the mandrel is such that slack of the first layer can be obtained by rotating the mandrel at an angle from the most downstream wrapper roll to the most upstream wrapper roll. Characteristic value.
The margin of the expansion stroke of the mandrel can be reduced.

According to a seventh aspect of the present invention, in the method of winding a steel strip, the lead rates of the plurality of wrapper rolls are set such that the plurality of steel strips under the wrapper rolls are pressed and idle while being pressed. The feature of this feature is that it is possible to prevent the second layer from being excessively penetrated and increasing slack.

[Brief description of the drawings]

FIG. 1 is a schematic configuration side view of a winding device showing an embodiment of the present invention.

FIG. 2 is a side view around a mandrel showing a standby state in the winding procedure.

3A and 3B show a first winding state in the winding procedure, wherein FIG. 3A is a side view around the mandrel when the leading end of the strip passes through a first wrapper roll, and FIG. FIG. 3C is a side view around the mandrel when the leading end passes through the second wrapper roll, and FIG. 3C is a side view around the mandrel when the strip leading end passes through the third wrapper roll.

FIG. 4 shows a state of the second winding in the same winding procedure. FIG. 4 (a) is a side view around the mandrel when the leading end of the strip passes through a first wrapper roll, and FIG. FIG. 3C is a side view around the mandrel when the leading end passes through the second wrapper roll, and FIG. 3C is a side view around the mandrel when the leading end of the strip passes through the third wrapper roll.

FIG. 5 is a side view around a mandrel showing a state of an N-th winding in the winding procedure.

FIG. 6 is a schematic configuration side view of a conventional winding device.

FIG. 7 is a schematic configuration side view of a different winding device of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot run table 2 Strip 3 Pinch roll 4 Throat guide 5 Mandrel 5a-5d Segment 6a-6c First to third wrapper rolls 7a-7c Mandrel guide 8 Side guide

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoji Teramoto 4-62 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term in Mitsubishi Heavy Industries, Ltd. Hiroshima Works 4E026 BA04 BA14 BC01 BC10

Claims (7)

[Claims] 1. A winding method in which an initial winding of a steel strip is performed by being supported by a plurality of wrapper rolls equally arranged around a scalable mandrel, the plurality of wrapper rolls are A method of winding a steel strip, comprising: pressing the steel strip sequentially as soon as the tip of the steel strip enters, while stopping the pressing of the upstream wrapper roll when pressing the downstream wrapper roll. 2. A winding method in which an initial winding of a steel strip is performed by being supported by a plurality of wrapper rolls equally arranged around a mandrel which can be expanded and contracted, a first winding is performed. A method of winding a steel strip, wherein only the most downstream wrapper roll is pressed as soon as the tip of the steel strip enters, while other wrapper rolls are not pressed. 3. A winding method in which an initial winding of a steel strip is carried out by being supported by a plurality of wrapper rolls equally distributed around a scalable mandrel. Meanwhile, in the most downstream side and several downstream wrapper rolls continuous with this, while the steel strip tip is sequentially pressed as soon as it enters, the pressing of the upstream wrapper roll is sequentially stopped at the time of pressing the downstream wrapper roll. A method of winding a steel strip, wherein the upstream wrapper roll is not pressed. 4. The wrapper roll is opened when the mandrel expands to a perfect circle.
4. The method for winding a steel strip according to 2 or 3. 5. The winding of a steel strip according to claim 1, wherein the standby diameter of the mandrel is such that the steel strip can be loosened when expanded to a perfect circle. Method. 6. The mandrel according to claim 1, wherein the lead rate of the mandrel is such that slack in the first layer can be removed by rotation at an angle from the most downstream wrapper roll to the most upstream wrapper roll. , 3, 4 or 5. 7. The lead ratio of the plurality of wrapper rolls is set to be idling while being pressed from the time when the steel strips under the wrapper rolls have two layers. 7. The method for winding a steel strip according to 4, 5, or 6.