JP3086120B2 - Pinch roll for meandering correction of strip, meandering correcting device and meandering correcting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roll for correcting a meander generated when a strip or the like travels, a meandering correcting device and a meandering correcting method using the same.

[0002]

2. Description of the Related Art Strips (steel plates, aluminum, copper,
A band such as a plastic is hereinafter generally referred to as a "strip". In a running line that continuously processes (1), a strip that has been off-centered by meandering (traversing) is returned to the center of the running line, and there is a meandering correction device as a device that performs stable passing. This type of device is generally a displacement type or steering type meandering correction device.

FIGS. 10A and 10B are views showing a meandering correction device of a displacement type, wherein FIG. 10A is a side view and FIG. 10B is a front view. The displacement type meandering correction device is usually constituted by one or two rolls, and FIG. 1 is a diagram showing a meandering correction device constituted by one roll. When the meandering is detected in the running strip 3 on the exit side of the meandering correction device as shown in FIG. 4A, the correction method by this device is applied to the strip 3 as shown in FIG. The steering roll 15 is turned in a vertical plane using the turning means 16, and the strip 3 is transported in the direction opposite to the meandering direction by an amount determined by the turning angle (θ) and the turning radius (L). This eliminates meandering on the exit side of the meandering correction device.

FIGS. 11A and 11B show a steering type meandering correction device, wherein FIG. 11A is a top view and FIG. 11B is a side view. As shown in FIGS. 7A and 7B, the correction method is as follows, in a plane including the strip 3 on the entrance side of the steering roll.
By turning the steering roll 15 using the turning means 16, the strip 3 is transferred in the lateral direction. As a result, the strip 3 moves laterally on the roll because the angle of incidence γ of the strip 3 with respect to the steering roll 15 is not a right angle. This effect is used to correct the meandering of the strip 3.

[0005] Such a meandering correction device of the displacement type or the steering system has a sufficient function in terms of strip meandering correction capability. However, these meandering correction devices are installed in a continuous strip processing line. When installing, there is a problem that a large space is required.

In order to solve this problem, the present applicant has proposed a meandering correction device provided with a roll in which a sleeve rotates at a predetermined angle with respect to a straight roll shaft, as disclosed in Japanese Patent Application Laid-Open No. 3-151111. JP-A-3-198907 discloses a meandering correction roll in which a plurality of bearings are provided on a bent shaft core and a rubber sleeve is mounted on the outer periphery of the bearings, and a device using the same. Furthermore, Japanese Patent Application Laid-Open No. 62-2092
Japanese Patent Publication No. 18 discloses a roll in which a thick roller (sleeve) that can expand and contract in the length direction is attached to a curved roller shaft, and is used as a roll for correcting wrinkling or wrinkling in addition to correcting meandering.

[0007]

If a meandering strip is running, the strip will run in a wider range than the strip width, so that a line stop trouble due to a so-called out-of-ear line occurs, and a trim allowance occurs in a side trimmer line. The yield decreases due to the increase.

The meandering correction roll needs a function of changing the bending angle of the roll surface. In addition, a meandering correction roll having a rubber sleeve mounted on the outer periphery and a roll having a thick roller (sleeve) capable of expanding and contracting in the length direction on a curved roller shaft are provided with a plurality of bearings between the shaft core and the sleeve or roller. Must be charged. Both have the problem that the structure becomes complicated.

An object of the present invention is to provide a meandering correction pinch roll which has a simple structure and can be easily introduced into an existing strip processing line, a meandering correction device using the same, and a meandering correction method.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is a pinch roll for correcting a meandering of a strip, a meandering correcting device shown in the following, and a meandering correcting method shown in the following.

"A pinch roll for correcting the meandering of a strip in which a pair of upper and lower taper rollers are arranged with taper directions reversed and their axes intersect.

The above-mentioned pinch roll is installed on the strip running line, and the rotational speeds of the upper and lower tapered rollers are determined.
And / or a meandering correction device for a strip, comprising a mechanism for independently setting left and right rolling forces.

A meandering correction method for a strip, which detects the meandering of the strip and controls the rotation speed of the pinch roll and / or the right and left rolling force. 』

[0014]

The function of the pinch roll according to the present invention will be described below.

FIG. 1 is a diagram showing the concept of a meandering correction pinch roll according to the present invention, wherein (a) is a plan view seen from above, and (b).
Is a cross-sectional view as seen from the roll entry side. 1 is an upper taper roller having a different diameter in the axial direction, 2 is a lower taper roller, and 3 is a strip. The upper and lower tapered rollers are a metal roller or a metal shaft around which a polymer material such as urethane rubber, special rubber, or special nylon is attached by lining or the like. The pinch roll 6 of the present invention sandwiches the strip 3 between the upper and lower tapered rollers 1 and 2,
The upper and lower tapered rollers are point-symmetrically intersected in the horizontal plane (2
θ).

The pinch roll 6 sandwiches the strip 3,
Although it rotates at a predetermined rotation speed, the radius differs depending on the axial position of the tapered roller, so that the tangential speed on the outer circumference is different. That is, the tangential velocity of the pinch roll at an arbitrary axial position X (the absolute value of the tangential velocity vector Vp (X)) | Vp (X)
| Is the rotational angular velocity of the roller ω, and the radius of the roller at X is R
If (X) is used, equation (1) is obtained.

| Vp (X) | = R (X) · ω (1) The upper and lower tapered rollers are point-symmetrically crossed at an intersection angle (2
θ), the direction of the tangential velocity vector Vp (X) of the roller and the direction of the velocity vector Vs (X) of the strip are shifted by a half angle (θ) of the intersection angle. Generates a relative slip vector Vp (X) -Vs (X).

FIG. 2 is a view showing an example of the relative slip vector between the taper roller and the strip and the distribution of the frictional force in the axial direction when the pinch roll for meandering correction of the present invention is used. A diagram showing the relative slip vector between the upper taper roller and the strip, (b) a diagram showing the distribution of the frictional force acting on the upper and lower surfaces of the strip, and (c) showing the distribution of the relative slip vector between the lower taper roller and the strip. FIG. Here, the magnitude of the strip velocity vector is
A case where the strip is equal to the tangential velocity vector of the large diameter portion of the tapered roller with which the strip is in contact will be described.

The relative slip vector has an angle に 対 し て with respect to the traveling direction of the strip, and the tangential velocity vector of the pinch roll differs in the width direction of the strip (Vpu ₁ <Vpu).
₂ <Vpu ₃ ), the relative slip angle 変 化 changes in the width direction of the strip (Ψu ₁ <Ψu ₂ <Ψu ₃ , Ψb ₁ > Ψb ₂ > Ψ).
b ₃ )

According to the magnitude and direction of the relative slip vector Vp (X) -Vs (X), a frictional force in the width direction of the strip is applied between the strip and the pinch roll as shown in FIG. Occur. The magnitude of the frictional force in the width direction is Fu ₁ <Fu ₂ <Fu ₃ on the upper surface of the strip, and Fb ₁ > Fb ₂ > Fb _{3 on the} lower surface.
And the direction of action of the frictional force is opposite on the upper and lower surfaces of the strip.

The resultant force F (F ₁ = Fu ₁ + Fb ₁ , F ₂ = Fu ₂ + Fb _{2) of} the upper and lower frictional forces acting in the width direction of the strip,
F ₃ = Fu ₃ + Fb ₃ ) is directed to the center in the width direction (the center of the running line), and becomes larger (F ₁ = F ₃ > F ₂ = 0) toward the end of the strip. Due to the resultant force of the frictional force, the central portion of the strip always runs while maintaining the axial center of the pinch roll. When the strip is off-centered by meandering, the resultant frictional force is (F ₁ <F ₂ <F ₃ ) or (F ₁ > F ₂ > F ₃ ), and an extra frictional force in the direction opposite to the off-center direction is added. Therefore, the pinch roll of the present invention has a self-adjustment function of always performing meandering correction without any control.

FIG. 3 is a graph showing changes in the amount of meandering on the ingress side and the amount of meandering on the exit side of the strip that has passed through the pinch roll for correcting meandering of the present invention. It can be seen that it has decreased to / 3.

Next, a method for correcting the meandering by positively changing the resultant force of the frictional force in the width direction using the pinch roll for correcting the meandering of the present invention will be described.

I. FIG. 4 is a diagram showing vectors and frictional forces acting on the taper roller and the strip when the pinch roll for meandering correction according to the present invention is used. Is a width-direction component F (X) of the frictional force acting on the width direction position X of the upper and lower surfaces of the running strip as shown in FIG.
Is expressed as a first approximation by equation (2).

[0025]

(Equation 1)

As is apparent from the equation (2), since the width direction component F (X) of the frictional force acting on the strip is proportional to the vertical surface pressure (X) applied to the strip, P (X) is changed. This makes it possible to change the meandering correction force of the strip.

FIG. 5 shows the vertical surface pressure P acting on the strip.
It is a figure which shows the relationship of (X) and the resultant force of the frictional force which generate | occur | produces in a strip. When the strips are subjected to the same vertical surface pressure (the reference state indicated by the dotted line), the resultant force (Fu + Fb) of the frictional force in the width direction is 0 (the center of the running line) in the axial center of the pinch roll. Zero), which is large and symmetrical on the left and right. However, when the rolling force of the right pinch roll is increased and a large vertical surface pressure is applied to the right strip (state A shown by a solid line), the resultant force (Fu + Fb) of the frictional force in the width direction becomes smaller than that of the pinch roll. It becomes 0 (zero) at a substantially central portion in the axial direction (substantially at the center of the traveling line), and is large on the right side and small on the left side. The force for moving the strip is the difference between the integrated values of the resultant force (Fu + Fb) of the frictional forces in the left and right directions, and the strip moves from right to left. Further, when the rolling force of the left pinch roll is increased, the resultant force of the frictional force is larger on the left side and smaller on the right side as indicated by the chain line B, and the strip moves from left to right.

Therefore, when the strip meanders from the center of the running line to the right, if the rolling force of the right pinch roll is increased, the strip moves from left to right, so that the meandering can be positively corrected. .

Next, a method for controlling the rolling force of the pinch roll will be described.

FIG. 6 is a diagram showing an example of a method for controlling the rolling force of the pinch roll. As shown in FIG. 6, the amount of deviation (the amount of meandering) of the strip 3 from the running line is determined by the meandering detector 4. The detected amount is input to the rolling force control device, and a rolling force command for the left and right pinch rolls is issued from the rolling force control device in accordance with the amount of left and right deviation.Based on this command, the left and right hydraulic units 9, 10 are controlled. The pressure changes, and the positions of the left and right pinch roll hydraulic cylinders 11, 12 are adjusted. This enables highly accurate meandering correction. In this embodiment, the case where the hydraulic cylinder is used as the actuator for setting the right and left rolling force is shown, but of course, the electric rolling method may be used. Further, one of the left and right actuators may be fixed and the other may be controlled.

II. Method of Correcting Meandering by Controlling Rotation Speed of Pinch Roll: As is apparent from equation (2), the frictional force acting on the strip in the width direction is determined by the tangential velocity vector Vp ( X), the frictional force in the upper and lower width directions can be changed by changing the rotational speeds of the upper and lower tapered rollers of the pinch roll.

FIGS. 7A and 7B are diagrams showing an example of the velocity vector and the frictional force in the width direction when the rotational speeds of the upper and lower taper rollers of the pinch roll are different, and FIG. 7A shows the case where the upper taper roller is decelerated. (B) is a diagram showing the case where the lower taper roller is decelerated, and (c) is a diagram showing the distribution of the resultant force of the frictional force in the width direction.

When the rotational speeds of the upper and lower tapered rollers are equal, the velocity vector and the frictional force are as shown by dotted arrows in FIGS. Combined frictional force (Fu + Fb)
Is in the reference state shown by the dotted line in FIG. 3 (c), is symmetrical, and functions to keep the strip at the center of the pinch roll.

[0034] When decelerating the rotational speed of the case in the upper tapered roller is tangential velocity vector acting on the strip upper surface, as shown by the solid line arrows in FIG. (A) is a vector Vpu ₁ from the vector Vpu ₁ '( vector Vpu ₂ from the vector Vpu ₂ so reduced ', from the vector Vpu ₃ vector Vpu _3' to) the frictional force in the width direction _{Fu 1> Fu 1 ', Fu} 2> F
u ₂ ′ and Fu ₃ > Fu ₃ ′. Therefore, the resultant force of the frictional force in the width direction of the upper and lower surfaces of the strip is Fu ₁ ′ + Fb ₁ > Fu ₂ ′ + F
b ₂ > Fu ₃ ′ + Fb ₃ , and the symmetry is lost on the left and right.
As shown by the one-dot chain line (A) in (c), the resultant force of the frictional force in the width direction of the left half of the strip increases, and a force for moving the strip from left to right acts. Therefore, when the strip is shifted to the left from the center of the running line (meanders), the meandering can be positively corrected by reducing the rotation speed of the upper taper roller of the pinch roll.

When the rotational speed of the lower taper roller is reduced, the tangential velocity vector acting on the lower surface of the strip is changed from the vector Vpb ₁ to the vector Vpb ₁ ′ as shown by the solid arrow in FIG. (From the vector Vpb ₂ to the vector Vpb ₂ ′ and from the vector Vpb ₃ to the vector Vpb ₃ ′), so that the frictional force in the width direction is Fb ₁ > Fb ₁ ′, Fb ₂ > F
b ₂ ′, Fb ₃ > Fb ₃ ′. Therefore, the resultant force of the frictional force in the width direction of the upper and lower surfaces of the strip is Fu ₁ + Fb ₁ ′ <Fu ₂ +
Fb ₂ ′ <Fu ₃ + Fb ₃ ′.
As shown by the dotted line (B) in FIG. 9C, the resultant force of the frictional force in the width direction of the right half of the strip increases, and a force for moving the strip from right to left acts. Therefore, when the strip is shifted to the right from the center of the running line, meandering can be positively corrected by reducing the rotation speed of the lower taper roller of the pinch roll. Similar control is also possible when increasing the speed of one of the upper and lower pinch rolls.

Next, a method for controlling the rotation speed of the taper roller of the pinch roll will be described.

FIG. 8 is a diagram showing an example of a method for controlling the rotation speed of the taper roller above and below the pinch roll.
As shown in the figure, the amount of deviation (the amount of meandering) of the strip 3 from the running line is detected by the meandering detector 4, and the detected amount is input to the taper roller rotation speed control device. Drive commands for the upper and lower tapered rollers are issued accordingly. Based on this command, the rotation of the drive motors 13, 14 connected to the upper and lower pinch rolls is controlled, and the speed of the pinch rolls is adjusted. This enables highly accurate meandering correction. In this embodiment, the case where the rotation speeds of the upper and lower pinch rolls are independently controlled is described. However, a method may be adopted in which one of the upper and lower rotation speeds is fixed and only the other is controlled.

In the above description, the influence of the rotational speed is described with reference to the case where the tangential speed of the large diameter portion of the taper roller is substantially equal to the traveling speed of the strip. However, when the reference condition of the rotational speed of the taper roller is different (for example, (2) When the tangential speed of the small diameter portion is almost equal to the traveling speed of the strip), the change in frictional force at the time of speed change can be calculated by equation (2), and the speed change condition that achieves the same control effect can be obtained. .

In this embodiment, a tapered roller having a truncated cone shape is used, but the shape of the roller is not limited. That is, the idea of the present invention is to change the tangential velocity in the roller width direction by changing the roller radius in the width direction, and to apply the resultant force of the frictional force in the width direction to the center by crossing the rollers. It is in. Therefore, it is preferable to select a pinch roll having an arbitrary shape based on the concept of the present invention. For example,
A roller combining a flat and a taper or a roller having a quadratic curve may be used. The "taper roller" of the present invention includes:
These rollers are also included.

It is known that crossing rolls changes the roll gap and creates a secondary crown that cancels the roll deflection (see, for example, Plasticity and Processing Vol.
28 No.321 (1987) p.1067). Although it depends on the absolute value of the rolling pressure of the pinch roll, in consideration of the roll deflection due to the vertical load and the roll gap change effect due to the crossing angle, an appropriate initial crown is given to the tapered roller type pinch roll, and an appropriate width direction is applied. A pressure distribution may be obtained.

[0041]

EXAMPLES The present invention will be described in more detail with reference to Examples.

FIG. 9 is a view showing a side trimmer line used in the embodiment of the present invention.

Reference numeral 6 denotes a pinch roll comprising an upper taper roller 1 and a lower taper roller 2, 3 a strip, 4 a meandering detector, 5 a control device, 7 a side trimmer, 8 a tension reel, and D a meandering correction device. .

The meandering correcting device D includes upper and lower tapered rollers 1,
Pinch roll 6 with 2 crossed point-symmetrically at a crossing angle of 1.0 °
, The meandering detector 4 and the control device 5 so that the right and left rolling force of the pinch roll and the rotational speed of the upper and lower taper rollers can be changed.

The tapered roller has a large diameter portion of 220 mm and a small diameter portion of 18 mm.
It was 0 mm in length and 1600 mm in barrel length, and was manufactured by lining urethane rubber on the surface of the shaft core of carbon steel S45C.

In the test, the strip was passed through the side trimmer line shown in FIG. 9, and the amount of meandering during running and the amount of trimmer at both ends were measured. The meandering correction ability was evaluated based on the amount of meandering correction and the yield loss at the trimmer.

Embodiment 1 A meandering detector 4 'is further provided in front of the meandering correcting device in the apparatus shown in FIG. 9, and the pinch rolls are point-symmetrically crossed at a crossing angle of 1.0 ° to produce a rolling force of 1.0 kg.
f / mm, pinch roll rotation speed 200rpm, plate thickness 0.7mm,
A coil made of SPCC material having a width of 1200 mm was passed through the strip, and the strip was deliberately subjected to periodic meandering in front of the meandering correcting apparatus to confirm the correcting ability of the apparatus of the present invention.

As shown in FIG. 3, the meandering amount was ± 25 mm before the meandering correction device, but ± 6 mm after the meandering correction device.
mm was fixed.

[Embodiment 2] In the apparatus shown in FIG. 9, normal operation is performed, the pinch rolls are crossed pointwise symmetrically at a crossing angle of 1.0 °, the rotation speed of the pinch rolls is 200 rpm, and the basic rolling force is 1.0. Kgf / mm, and the rolling force was controlled in accordance with the output of the meandering detector 4 by the method shown in FIG. The meandering amount in this case is within ± 0.5 mm, and the yield loss in the side trimmer is
0.8%. In addition, the coil processing amount in the side trimmer was 1500 tons.

[Embodiment 3] In the apparatus shown in FIG. 9, the pinch rolls are crossed pointwise symmetrically at a crossing angle of 1.0 ° and the rolling force is reduced to 1.0.
Kgf / mm, the basic rotation speed of the pinch roll was 200 rpm, and the rotation speed of the pinch roll was controlled in accordance with the output of the meandering detector 4 by the method shown in FIG. The meandering amount in this case is within ± 0.6 mm, and the yield loss at the side trimmer is 1.
It was 0%. In addition, the coil throughput in the side trimmer was 2000 tons.

COMPARATIVE EXAMPLE As a comparative example, the pinch roll was released and passed through the apparatus shown in FIG. The meandering amount in this case is within ± 10.5 mm, and the yield loss in the side trimmer is
2.5%. Incidentally, the coil throughput in the side trimmer was 3000 tons.

From the results of these tests, it was found that the pinch roll having the tapered rollers crossed has a meandering correcting effect, and the meandering amount can be reduced from ± 25 mm to ± 6 mm, about 1/4. . Further, under normal operating conditions, if the control of the right and left rolling force and the control of the rotation speed of the upper and lower taper rollers are performed, the meandering amount will be ± 10.5mm to ± 0.5mm and ± 0.6m.
m. Since the occurrence of meandering was thus prevented, the trim loss was greatly reduced, and the yield was improved.

[0053]

The pinch roll of the present invention has a simple structure and can correct meandering, can be easily incorporated into the current line, and furthermore, can control the left and right rolling force and can control the rotational speed of the upper and lower taper rollers. By performing the control, highly accurate meandering correction is possible. As a result, the strip runs stably, so that there is no trouble in stopping the line due to slip of the ear wire, and the yield can be improved by reducing the trim margin.

[Brief description of the drawings]

FIG. 1 is a view showing a velocity vector and a frictional force acting on a strip surface when a strip is run by a pinch roll of the present invention.

FIG. 2 is a diagram showing a velocity vector and a friction force acting on upper and lower surfaces of a strip.

FIG. 3 is a diagram showing meandering amounts measured on the input side and the output side of a pinch roll according to the present invention.

FIG. 4 is a diagram illustrating a relationship between a relative slip vector and a frictional force.

FIG. 5 is a view showing the relationship between the vertical surface pressure acting on the left and right of the strip and the resultant force of the width direction frictional force.

FIG. 6 is a diagram illustrating a method of controlling the rolling force on the left and right of the pinch roll.

FIG. 7 is a diagram showing a change in a speed vector and a change in frictional force by changing the rotation speed of the pinch roll up and down.

FIG. 8 is a diagram showing a method of controlling the rotation speed of the pinch roll up and down.

FIG. 9 is a diagram showing a line in which the meandering correction device incorporating the pinch roll of the present invention is installed in front of a side trimmer.

FIG. 10 is a diagram showing a conventional meandering correction device of a displacement system.

FIG. 11 is a diagram showing a conventional steering-type meandering correction device.

[Explanation of symbols]

1. Upper taper roller 2. Lower taper roller
3. Strip 4, 4 '. Meandering detector 5. Control device
6. Pinch roll 7. Side trimmer 8. Tension reel
9. Left hydraulic unit 10. Right hydraulic unit 11. Left hydraulic cylinder 1
2． Right hydraulic cylinder 13. Upper drive motor 14. Lower drive motor 1
Five. Steering roll 16． Turning means D. Meandering correction device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Matsuda 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside the Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Hideaki Furumoto Kannon Shinmachi 4 in Nishi-ku, Hiroshima City, Hiroshima Prefecture No. 6-22, Mitsubishi Heavy Industries, Ltd. Hiroshima Laboratory (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 39 / 14,39 / 08 B21C 47/00 B65H 23 / 038,27 / 00

Claims (3)

(57) [Claims] 1. A pinch roll for correcting a meandering of a strip in which a pair of upper and lower taper rollers are arranged with their taper directions reversed and their axes intersect. 2. A pinch roll in which a pair of upper and lower taper rollers are arranged with their taper directions reversed and their axes intersecting is installed on a running line of the strip, and the rotational speed of the upper and lower taper rollers and / or the right and left rolling force are reduced. , A meandering correction device for a strip, comprising a mechanism for setting each independently. 3. A strip pinch roll in which a pair of upper and lower taper rollers are arranged in a taper direction opposite to each other and with their axes intersecting is provided on a strip running line, a meandering amount of the strip is detected, and a pinch roll is formed in accordance with the meandering amount. Rotation speed, and / or
Alternatively, a meandering correction method for a strip, characterized by controlling a right and left rolling force.