JP2933518B2 - Winding method of metal strip by up coiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a metal strip using an up coiler, and more particularly to a method for winding a metal strip using an up coiler capable of reducing loosening of a coil.

[0002]

BACKGROUND OF THE INVENTION up coiler in equipment for forming a metal strip 1 after rolling to coils, there <br/> with numerous installed in the rolling mill. The up coiler forms a coil without using a reel, so that the coil can be easily taken out, and the equipment is simple and inexpensive.

[0003] As shown in FIG. 4, A Tsu Pukoira consists pinch rolls 5, bending rolls 6 and the cradle rolls 7. The upcoiler is arranged on the exit side of a rolling mill not shown. The long metal strip 1 rolled into a predetermined shape by a rolling machine is bent at a predetermined curvature by a bending roll 6 after passing through a pinch roll 5. The bent metal strip 1 is held by a cradle roll 7 and wound into a coil,
It becomes coil 2.

Conventionally, the speed of the metal strip 1 supplied by the pinch rolls 5 or equal to the circumferential speed of the coil 2 to be rotated by the cradle rolls 7, is operated by several percent slower state. In order to smoothly wind the metal strip 1, the peripheral speed of the cradle roll υ _cr is made several percent faster than the peripheral speed of the pinch roll υ _p , and the peripheral speed of the coil 2 is made several percent faster than the speed of the metal strip 1. Often operated.

[0005] winding the state of the metal strip 1, as shown in FIG. 5, ₀ a radius of curvature imparted to the metal strip 1 during bending rolls 6 pass [rho, when the coil outer radius is [rho _1, the [rho ₀ the center of curvature C ₀ and the coil center C _1, are displaced. <br/> curvature radius [rho ₂ for wind around the metal strip 1 to the coil 2 is inevitably larger than the coil outer radius [rho _1. This radius of curvature ρ ₂ is roughly estimated by the following equation (2) , where h is the height from the pinch roll pass line position 3 to the cradle roll axis .

[0006]

(Equation 2)

However, the curvature radius [rho ₂ of the metal strip for wound around the metal strip on the coil, because not greater than the coil outer radius [rho _1, the bending mode - bent back by moments occur, the metal strip There was a problem that a large winding looseness occurred in the plate.
In particular, it has been difficult to wind a soft material or a thick material into a tight coil.

For this reason, there has been proposed a method of winding a soft material or a thick material into a tight coil. For example, a) Japanese Patent Publication No. 55-19689 discloses a method in which a press roll is provided above a coil, and the coil is pressed with an appropriate pressure to minimize the bending return of the metal strip after passing through the bending roll. . Also,
B) In Japanese Patent Application Laid-Open No. 7-185655, the peripheral speed of the cradle roll is reduced as the metal strip is wound up.
This is a method of suppressing the return of the sheet from bending after passing through the bending roll. These methods suppress the formation of a gap between the plates due to the release of the bending moment and tightly wind the metal strip.

[0009]

However, in these methods, a gap is formed between the plates (FIG. 6: (a)).
Can be wound and the metal strip can be wound around a tight coil, but when the coil is lifted, there is a problem that the metal strip becomes loosely wound (FIG. 6B). In particular, a metal strip that has been chamfered to remove surface scale has a small surface roughness and a small frictional force, so that the coil has a tendency to become loose after winding. When the winding looseness becomes large, there is also a problem that the plates rub against each other and the surface is scratched. It was difficult to completely remove the scratches by rolling in a subsequent step, and a plate having good surface quality could not be obtained. Furthermore, the surface roughness is
It was difficult to wind a material having a small frictional force into a tight coil.

Accordingly, an object of the present invention is to provide a method for winding a metal strip made of a soft material or a thick material by using an up coiler, which can suppress the loosening of the metal strip after the coil is formed. It is what it was. In particular, it is an object of the present invention to provide a method for winding a metal strip having been subjected to facing. An object of the present invention is to prevent the occurrence of scratches and prevent the surface quality of the metal strip from deteriorating by suppressing winding loosening after forming the coil. In particular, the present invention is applied to a material in which the surface roughness is reduced by facing and the loosening easily occurs.

[0011]

In order to achieve the above-mentioned object, according to the present invention, a pinch roll 5 for feeding a metal strip 1 and a metal sheet 1 having a predetermined curvature are provided. A bending roll having a bending roll 6 which is fed upward while bending, and a cradle roll 7 which is located above the bending roll 6 and supports the coil 2 formed by the metal strip 1 bent by the bending roll 6. Using a coiler, the cradle roll peripheral speed υ _cr is made slower than the pinch roll peripheral speed ラ ー_p within a range in which no compression force acts on the metal strip 1. By suppressing the tensile force generated by the difference of the pinch roll circumferential speed upsilon _p cradle roll peripheral speed upsilon _cr, it suppresses the loosening after coiling of the metal strip 1, the coil tight metal strip Can be formed.

[0012] The invention according to claim 2 is the invention according to claim 1.
In addition to the configuration described in above, at the start of coil formation, the ratio of the cradle roll peripheral speed υ _cr to the pinch roll peripheral speed υ _p is determined by the thickness t of the metal strip 1 to be wound, the coil radius r, and the pinch roll pass line. setting the relationship which is determined by the height h of the cradle roll axis relative to the position 3
Is obtained is characterized by a constant.

In the invention according to claim 3 , the relational expression is a ratio of a cradle roll peripheral speed υ _{cr to} a pinch roll peripheral speed υ _p, a plate thickness t of the metal strip 1 to be wound,
The relationship between the coil radius r and the height h of the cradle roll axis center with respect to the pinch roll pass line position 3 is as follows.
This is a relational expression as shown in Expression (1) , wherein C is in the range of 0 to 0.02.

[0014]

(Equation 1)

[0015] invention according to claim 4, characterized in that in the (1), set to the outer coil radius of winding end a r, to fix the cradle roll peripheral speed ratio obtained pinch roll peripheral speed It is what it was. in this case,
In the first half of the winding of the coil, even if the tensile force on the metal strip is excessive, it is restrained by the metal strip on the outer periphery of the coil, so that the release of the elastic energy of the tension of the metal strip is suppressed. .

[0016] In the invention according to claim 5, the formula (1)
With the increase in coil outer radius due to winding
The radius of the coil of the above relational expression is
Replace with the outer radius of the il.
Set the cradle roll peripheral speed ratio to the peripheral speed
It is characterized by the following.

The invention according to claim 6 is characterized in that the outer radius of the coil at the end of winding is at least twice the height of the cradle roll axis with respect to the pinch roll pass line position.

Next, the present invention will be described in detail. The inventors have conducted intensive studies to derive the above solution.
The cause of the winding failure that the coil is loosened when the coil is lifted will be described. As shown in FIG. 7, there are two causes of coil loosening: (a) loosening by releasing the bending moment of the metal strip and (b) loosening by releasing the tight tightening of the metal strip. The loosening of the winding due to the release of the bending moment in (a) is such that the bending moment generated when the coil is wound is released by lifting the coil, a gap is generated in the coil, and the winding is loosened. On the other hand, the loosening caused by the release of the tight tightening in (b) is that the tensile force generated at the time of winding the coil is loosened when the restraint is removed by lifting the coil and the elastic energy is released. is there.

The suppression of winding loosening by releasing the bending moment shown in FIG. Due to the weight of the coil itself, the metal strip is sandwiched between the cradle roll and the coil, and the metal strip in the coil is in a state where release of the bending moment is suppressed. When the coil is lifted, the restrained state of the coil changes, the bending moment is released, and the coil is loosened.

[0020] As described in the prior art, the radius of curvature of the metal strip 1 shown in FIG. 5 is wound around the coil 2 [rho ₂
Is estimated by the equation (2) ρ ₂ = ρ ₁ + h / 2. Here, ρ ₁ is the outer radius of the coil, and h is the cradle roll axis center height from the pinch roll pass line position 3. As the winding of the coil progresses, the outer radius ρ _{1 of} the coil increases, and h / 2 in the equation (2) relatively decreases, and the outer radius ρ ₁ of the coil and the curvature required for winding around the coil 2 The difference from the radius ρ ₂ becomes smaller. As a result, it can be seen that the bending moment of the metal strip generated at the time of winding on the coil is reduced.

Further, the observation of the wound coil up coiler, Misao Gode - Analysis of data, if the outer peripheral portion clearance without parts metal strip is wound into a coil sufficient bending It has been found that it is possible to restrain an increase in the diameter of the inner peripheral portion due to release of the moment. That is, by making the wound portion of the metal strip thicker at the outer periphery of the coil without any gap, it is possible to suppress winding loosening due to release of the bending moment.

However, the portion around which the metal strip is wound around the outer periphery of the coil is made thicker, and the radius of curvature ρ ₂ required to wind the metal strip 1 around the coil ₂ and the outer radius ρ ₁ of the coil are substantially equal to each other. Even if the winding is terminated in a state where the bending moment is small, the coil is loosened.

The cause is loosening of the winding due to the release of tight tightening shown in FIG. 7B. The tensile force of the metal strip generated at the time of winding is restricted by the coil, and elastic energy is stored in the coil in the form of a spiral spring. By lifting the coil, the restraint of the coil is released, and the winding is loosened. It is considered that this tensile force is generated due to an imbalance between the peripheral speed of the pinch roll and the peripheral speed of the cradle roll during winding.

The inventors have analyzed in detail the tensile force of the metal strip generated at the time of winding, and studied a method for suppressing the generation of the tensile force. FIG. 1 shows the locus of the metal strip 1 at the time of winding. Assuming that there is no slippage between the metal strip and the roll, the length [Delta] L _p of the metal strip 1 passing through the pinch rolls 5 during the time Δτ pinch roll circumferential speed upsilon _p is below (3
a) It is shown by the equation. Meanwhile, the cradle roll peripheral speed
The length ΔL _cr of the metal strip 1 sent by the cradle roll 7 at υ _cr is expressed by the following equation (3b).

[0025]

(Equation 3)

As shown in FIG. 1, the metal strip 1 is bent by a bending roll 6 and wound around the coil at the uppermost part b of the coil. The arc length ab drawn by the metal strip 1 from the bending start portion a of the metal strip 1 by the bending roll 6 to the uppermost part b of the coil, and the lowermost part of the coil from the uppermost part b of the coil to c. The sum L of the arc lengths bc drawn at the outermost periphery of the coil is expressed by the following equation (4).
You. Here, r is the coil outer radius, and h is the pinch roll path.
At the height of the cradle roll axis center with respect to the slide position 3
is there.

[0027]

(Equation 4)

[0028] A coil of metal strip 1 of the plate thickness t taken one lap winding
Al is the coil outer radius becomes r + t. Assuming that the uppermost part of the coil after one round of winding is b 'and the lowermost part of the coil is c', the metal band is formed from the bending start part a of the metal strip 1 by the bending roll 7 to the uppermost part b 'of the coil. The sum L 'of the arc length ab' drawn by the plate 1 and the arc length b'c 'drawn at the outermost periphery of the coil is expressed by the following equation (5).

[0029]

(Equation 5)

[0030] For each coil 1 lap winding, the length of the trajectory will be increased by the difference ΔL between the two. ΔL is represented by the following
It is represented by equation (6a). When the outer radius of the coil is r, the time τ required for winding one round is represented by the following equation (6b).
Is represented by

[0031]

(Equation 6)

The length of the metal strip 1 passing through the pinch roll 5 during the time τ is equal to the length of the metal strip 1 sent by the cradle roll 7 and the arc length (ab + b) when winding one round.
If the sum of the increments ΔL of c) is equal, the feed amount of the metal strip 1 by the pinch roll 5 and the cradle roll 7 is balanced,
No stress occurs in the metal strip 1. That is, the metal strip 1
The generation of a tensile force or a compressive force can be prevented.

[0033] Thus, the _{υ p τ = υ cr τ +} ΔL,
From the equations (6a) and (6b), the following equation (7) is obtained. K
The ratio of ladle roll peripheral speed υ _cr to pinch roll peripheral speed υ _p
When controlled to satisfy the following equation (7),
Of metal strip 1 by roller 5 and cradle roll 7
Are balanced, and no stress is generated in the metal strip 1. The ratio between the cradle roll peripheral speed υ _cr and the pinch roll peripheral speed υ _p is
When the ratio is larger than the ratio determined by the equation (7), a tensile force is generated in the metal strip, and when it is smaller, a compressive force is generated.

[0034]

(Equation 7)

The result of the above equation (7 ) means that the tensile force generated in the metal strip 1 is reduced by making the cradle roll peripheral speed υ _cr lower than the pinch roll peripheral speed υ _p . As described above, the formation of the coil of the metal strip 1 by the conventional up coiler is performed at the cradle roll peripheral speed υ.
pinch roll circumferential speed upsilon _p and operations that equal or few percent faster is performed _cr. On the other hand, the present invention is characterized by slower than pinch roll circumferential speed upsilon _p cradle roll peripheral speed upsilon _cr. Cradle roll peripheral speed υ _cr
The Controlling the pinch roll circumferential speed upsilon _p, it can be reduced loosening of the coils due to the release of tension in the elastic energy of the metal strip.

However, during winding, the metal strip 1
When an excessive compressive force is generated, the metal strip 1 cannot be smoothly fed into the coil 2 and the metal strip 1 cannot be wound up. For this reason, in the present invention, it is necessary to make the peripheral speed of the cradle roll slower than the peripheral speed of the pinch roll within a range where an excessive compressive force does not act on the metal strip.

For this reason, whether excessive compression force acts on the metal strip
In order to avoid this, a correction term C is added to the equation (7).
Was. The result is shown in the following equation (1). The correction term C is a constant related to the material of the metal strip, and C is in the range of 0 to 0.02. When C exceeds 0.02, the loosening of the coil due to the release of the tensile elastic energy of the metal strip increases.

[0038]

(Equation 1)

[0039] The range of the correction term C is determined as follows.
Was called. Pinch roll peripheral speedυ _p Cradle against
Peripheral speedυ _cr Deceleration rate α = − (υ _cr −υ _p ) / Υ _p Is
From the expression (7), the following expression (8) is obtained.

[0040]

(Equation 8)

The winding slack normally dimensions become scalping coils problems thickness t is 15～19Mm, diameter of coil outer side is about maximum 1600 mm. The height h of the cradle roll axis center with respect to the pinch roll pass line position is 300 m
m, the pinch roll peripheral speed υ _p at the outermost circumference
The optimum deceleration rate α of the cradle roll peripheral speed υ _cr
From equation (8 ) , 0.0171 ( 1.71% ) to 0.0
217 ( 2.17% ) . For this reason, the maximum value of the correction term C is substantially equivalent to the median value of the optimal deceleration rate α.
It was set to 0.02. When the plate thickness t is 15 mm, the maximum value of the correction term C is set to 0.017 or less, and C is set to 0 to 0.
In the range of 017, it is preferable to wind up the metal strip with an up coiler.

Further, the above-mentioned relational expression (1) is calculated by using a computer.
Is stored in the storage means, and the increase in the outer radius of the coil accompanying the winding is input to the computer by the input means. These input de - Konpyuta from data - to calculate the ratio of the cradle roll peripheral speed with respect to the pinch roll circumferential speed by the calculation means, the control means pinch roll peripheral speed and the cradle roll peripheral speed, it may be controlled.

[0043] Using the above relational expression (1), the pinch roll circumference
To specifically control the speed and the cradle roll peripheral speed,
Pinch roll peripheral speed expressed by the above equation (8)） _p Against
Cradle roll peripheral speedυ _cr It is convenient to use the deceleration rate α
is there. By rewriting equation (1) using the deceleration rate α,
The following equation (9) is obtained. The deceleration rate α in the following equation (9) is
Calculated by the coil outer radius r when winding
Rollol peripheral speed ル _cr And pinch roll peripheral speedυ _p And the following equation
It is preferable to reset the settings as needed to satisfy (9).

[0044]

(Equation 9)

Further, by providing the wound portion of the metal strip on the outer peripheral portion of the coil without any gap, the loosening of the winding due to the release of the bending moment is suppressed. For this reason, it is necessary to wind the coil tightly by preferably generating a tensile force on the metal strip so as to prevent a compression force from being generated on the metal strip when winding the coil. Moreover, it is in the second half stage of the winding of the coil to reduce the difference between the curvature radius [rho ₂ to wrap around the outer coil radius [rho ₁ and the coil 2, to reduce the bending moment of the metal strip produced during winding the coil Is preferred. For this reason, it is preferable that the coil outer radius at the end of winding be at least twice the height of the cradle roll axis with respect to the pinch roll pass line position.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described. Metal strip of pure copper (board thickness: 15 mm), 7/3 brass (board thickness: 15 mm and 19 mm) (board width: 650 mm, length: 70)
using m), by up coiler, diameter of the inner side 600
mm, the winding of the coil with a diameter of 1500mm outer side went. At this time, the height of the cradle roll axis with respect to the pinch roll pass line position is 300 mm. FIG. 8 shows pure copper at the start, midway, and end of winding and 7
The result of calculating the relationship between the curvature and the bending moment of a metal strip of / 3 brass is shown. The material constants used in the calculation are as shown in Table 1 .

[0047]

[Table 1]

As a representative example, a metal strip of 7/3 brass (plate thickness: 19 mm) will be described. At the start of winding, the metal strip is bent to a radius of curvature ρ ₀ (S) by a bending roll. The brass strip is wound around the coil
Are bent back to the curvature radius ρ ₂ (S), it is larger than the coil outer radius ρ ₁ (S). Next, the metal strip is wound around a coil to have a radius of curvature ρ ₁ (S) ′. The gap d (S) between the plates of the metal strip coil at the start of winding is expressed by the following equation (10), where t is the plate thickness.

[0049]

(Equation 10)

Similarly, the gaps d (M) and d (E) between the plates of the metal strip coil during and after winding.
Is given by the following equations (11a) and (11b) . Comparing the gap between the coil plate and the coil from the start to the end of coil winding, it is clear from FIG. 8 that the closer the coil winding is to the end, the smaller the gap between the plate and the plate. is there. That is, if the outer radius of the coil at the end of winding is at least twice the height of the cradle roll axis with respect to the pinch roll pass line position, the metal strip can be wound around the coil without gaps.

[0051]

[Equation 11]

The curvature ρ ₀ of the bending process of the metal strip by the bending roll is increased in accordance with an increase in the outer radius of the coil accompanying the winding. Further, from FIG. 8, when a metal strip is wound around a coil having the same outer radius, the difference ρ ₁ ′ −ρ ₁ between the radius of curvature of the metal strip and the outer radius of the coil is expressed by pure copper which is softer than hard 7/3 brass. Is bigger. Thin material (t =
15) shows that the difference ρ ₁ ′ −ρ ₁ between the radius of curvature of the metal strip and the outer radius of the coil is larger for the thick material (t = 19) than for 15).

Next, based on the equation ( 7 ), the coil outer radius r
FIG. 2 shows the relationship between the deceleration rate α (α = − (ロ ー ル_cr −υ _p ) / υ _p ) of the cradle roll peripheral speed υ _cr and the pinch roll peripheral speed υ _p . From the figure, for example, the inner side
Diameter 600 mm, to perform the coiling of diameter 1500mm outer side, the winding including the deceleration rate α of cradle roll the plate thickness of 15mm is set to 0.04 (4.0%), winding As the coil outer radius increases, the deceleration rate α is reduced as needed, and at the end of winding, the deceleration rate α is increased.
Is set to 0.018 ( 1.8% ) , no stress is generated on the metal strip, and loosening of the coil can be suppressed. On the other hand, when the sheet thickness is 19 mm, the deceleration rate α is 0.051 ( 5.1% ) at the beginning of winding and 0.0 % at the end of winding.
By setting the value to 23 ( 2.3% ) , no stress is generated on the metal strip, and the loosening of the coil can be suppressed.

[0054] Also, 0.015 correction term C in Equation (1)
The deceleration rate α of the cradle roll peripheral speed υ _cr to the pinch roll peripheral speed υ _p is substantially 0.015
It is preferred that (1.5%) reduced. For example, when the plate thickness is as thin as 15 mm , the substantial deceleration rate of the cradle roll is set to 0.025 ( 2.5% ) at the beginning of winding,
With increasing coil outer radius due to winding, the real
The actual deceleration rate at any time ,
Set the appropriate deceleration rate to 0.03 ( 0.3% ) . This place
In this case, the coil can be tightly wound by an appropriate tensile force on the metal strip, and the loosening of the coil can be suppressed.

[0055] If the plate thickness of 19mm and the thick, outer coil and a half
Set the diameter r to the coil outer radius at the end of winding from the beginning.
It is good to use the deceleration rate of the ladle roll. That is, if the correction term C is 0, the deceleration rate of the cradle roll is 0.02.
3 (2.3%), or correction term if C is 0.015
Sets the deceleration rate to 0.08 (0.8%). When the metal strip is wound around the coil, it can be safely wound over the entire length of the metal strip, and the coil can be prevented from loosening.

From the results of the above experiments, it can be seen from Japanese Patent Publication No. 55-196.
Even in the case of using the method disclosed in Japanese Patent Application Laid-Open Publication No. 80-80, the winding loosening cannot be suppressed in principle by releasing the elastic energy. Also, as disclosed in Japanese Patent Application Laid-Open No. 7-185655, it is apparent that reducing the circumferential speed of the cradle roll in accordance with an increase in the coil diameter cannot effectively suppress the generation of tension from the inner circumference to the outer circumference of the coil. .

[0057]

EXAMPLES In order to confirm the effects of the present invention, tests were conducted using actual equipment. Table 2 shows the test conditions.

[0058]

[Table 2]

In this test, the test was performed by setting the deceleration rate α of the cradle roll from the beginning to the end of winding of the coil. Pure copper metal strips were wound around coils at different deceleration rates α. After that, the total in the radial direction of the gap formed between the plates and the amount of loosening caused by the lifting of the coil were measured.

FIG. 3 shows the relationship between the cradle roll deceleration rate, the clearance and the amount of loosening as a result of the measured test. Compared to the conventional cradle roll deceleration rate α of 0,
The deceleration rate α is 0.005 to 0.02 ( 0.5 % to 2.0
% ) , The gap is equal to or less than the conventional method. The cradle roll deceleration rate α in the range of the present invention indicates that it is possible to wind the coil tightly.

[0061] On the other hand, loosening of the coil can be reduced by slowing from pinch roll circumferential speed upsilon _p cradle roll peripheral speed upsilon _cr. Cradle roll deceleration rate α is 0.0
Between 0.5 and 0.02 ( 0.5 % to 2.0% ), the amount of loosening can be reduced from 1/3 to 1/2 as compared with the conventional method. Due to the deceleration of the cradle roll, the tensile force acting on the metal strip at the time of winding can be suppressed, and the amount of loosening of the coil caused by lifting is reduced . Na us, can not be eliminated loosening completely is because part due to an increase in the coil diameter caused by the release of the bending moment remains.

Under the conditions of this test, when the plate thickness is 15 mm
Averaging the case of 19 mm and 19 mm, the deceleration rate α of the cradle roll required to prevent the generation of stress on the metal strip is 0.045 ( 4.5) at the beginning of winding from the equation ( 7 ).
% ) , Gradually decreases with winding, and becomes 0.021 ( 2.1% ) at the end of winding.

In this test, in which the metal strip is wound around the coil from the beginning to the end at the cradle roll deceleration rate α set by the outer radius of the coil at the end of winding, the operating condition in the present invention is the correction term of the equation (1). Since C is in the range of 0 to 0.02, the deceleration rate α is substantially 0.21 ( 0.1
%) To 0.021 ( 2.1% ) . In this range, it has been found that the amount of loosening of the coil can be significantly reduced without changing the gap between the plates of the coil as compared with the conventional method. In a test in which the deceleration rate α was fixed at a deceleration rate α of 3% of the cradle roll exceeding 2.1%, the metal strip could not be fed into the coil during winding of the coil. This is during coil winding,
This is due to the compression force acting on the metal strip.

[0064]

According to the first to third aspects of the present invention, the tension generated due to the imbalance between the pinch roll peripheral speed and the cradle roll peripheral speed is suppressed. As a result, winding loosening after coil formation can be suppressed, scratches can be prevented from occurring, and a decrease in the surface quality of the metal strip can be avoided. In particular, the present invention can be applied to a material in which the surface roughness is reduced by facing and the winding is easily loosened.

According to a fourth aspect of the present invention, in addition to the effects of the first to third aspects, the ratio of the cradle roll peripheral speed to the pinch roll peripheral speed is fixed to a value set by the outer radius of the coil at the end of winding. This eliminates the need to change operating conditions during coil winding. Also, in the first half of the winding of the coil, even if the tensile force on the metal strip 1 becomes excessive, the coil is restrained by the metal strip 1 on the outer periphery of the coil.
Release of tensile elastic energy of the metal strip is suppressed, and the coil can be wound tightly.

According to a sixth aspect of the present invention, in addition to the effects of the first to fifth aspects, the outer radius of the coil at the end of winding is more than twice the height of the cradle roll axis with respect to the pinch roll pass line position. By doing so, the wound portion of the metal strip can be provided on the outer peripheral portion of the coil without any gap, and loosening of the winding due to release of the bending moment can be suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an upcoiler according to the present invention.

FIG. 2 is a diagram showing a relationship between a coil outer diameter and a cradle roll deceleration rate.

FIG. 3 is a diagram illustrating a relationship between a cradle roll deceleration rate and a clearance and a winding loosening amount.

FIG. 4 is an explanatory view showing coil winding of a conventional upcoiler.

FIG. 5 is an explanatory view showing a state when a coil is wound in a conventional upcoiler.

FIG. 6 is an explanatory view showing a winding defect in a conventional upcoiler.

FIG. 7 is an explanatory diagram showing factors of loose winding in a conventional upcoiler.

FIG. 8 is an explanatory diagram showing the relationship between the curvature of the metal strip and the bending moment.

[Explanation of symbols]

Reference Signs List 1 plate 2 coil 3 pinch roll pass line position 4 height position of cradle roll axis center 5 pinch roll 6 bending roll 7 gradle roll a bending start of metal strip by bending roll b top part of coil b ' bottom c 'thickness of the metal strip to be taken bottom upsilon _p pinch roll circumferential speed upsilon _cr cradle roll peripheral speed t turn coil after one round winding r of the top c coils of the coil after one round winding Radius inside coil or coil outside radius for winding h Height of cradle roll axis with respect to pinch roll pass line position ρ ₀ Curvature radius given to metal band plate by bending roll ρ ₁ Coil outside radius ρ ₂ Metal band plate to coil Radius of curvature required to wrap

Continued on the front page (72) Inventor Yoichi Takahashi 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel, Ltd. Kobe Research Institute (72) Inventor Shusuke Yanagi 1 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture 5-5-5 Kobe Steel, Ltd. Kobe Research Institute (58) Investigated field (Int.Cl. ⁶ , DB name) B21C 47/02 B21C 47/08 B65H 18/20 B65H 23/195 B65H 43 / 00

Claims (6)

(57) [Claims] A pinch roll for feeding a metal strip, a bending roll for feeding the metal strip while bending the metal strip to a predetermined curvature, and a pinch roll positioned above the bending roll;
Using an up coiler having a cradle roll that supports a coil formed by the metal strip bent by the bending roll, pinch the cradle roll peripheral speed within a range where a compression force does not act on the metal strip. A method for winding a metal strip by an up coiler, wherein the winding speed is lower than a peripheral speed. 2. At the start of coil formation, the ratio of the cradle roll peripheral speed to the pinch roll peripheral speed is determined by the thickness of the metal strip to be wound, the coil radius, and the height of the cradle roll axis relative to the pinch roll pass line position. 2. The method for winding a metal strip by an upcoiler according to claim 1, wherein the setting is performed by a determined relational expression. 3. The relational expression is _{defined as} a ratio of a cradle roll peripheral speed υ _{cr to} a pinch roll peripheral speed υ _p, a thickness t of a metal strip to be wound, a coil radius r, and a cradle roll relative to a pinch roll pass line position. The relational expression according to claim 2, wherein the relation with the height h of the axis center is as shown in the following expression (1) , and C is in the range of 0 to 0.02. Winding method of metal strip with up coiler. (Equation 1) 4. In the above formula (1), r is set to the outer radius of the coil at the end of winding, and the ratio of the cradle roll peripheral speed to the obtained pinch roll peripheral speed is fixed. Winding method of metal strip with up coiler. (5) In the above equation (1),
As the outer radius of the coil increases, the coil of the relational expression
Set the radius to the outer radius of the coil when winding In exchange,
From the relational expression, the cradle rod to the pinch roll peripheral speed
Wherein the peripheral speed ratio is set at any time.
Is winding of a metal strip by the up coiler described in 3.
Method. 6. The method of claim 1 to 5 the coil outer radius of the end of winding is equal to or more than twice of the cradle roll axis of height to the pinch roll pass line position Neu
A method for winding a metal strip with an up coiler according to any one of the above.