JPH10194540A - Steering device and steering method for strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively correct the meanders of a strip with the only use of a turn roller and with no auxiliary rollers. SOLUTION: A turn roller 3 for turning a strip has a turning axis or line M perpendicular to its center axis 0 at the middle point (m) thereof. The turn roller 3 is turned such that the turning axis M pivots on one point (n) thereon in a plane P including the center axis O and the turning axis M. The plane P is inclined on the center axis O of the turn roller 3 prior to turning. The turn roller 3 is inclined by an angle a proportionate to its turning angle θ to instantaneously move a strip widthwise on the principle of movement resulting from the turn and subsequently on the principle of winding resulting from the inclination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip steering apparatus used for correcting strip meandering in a vertical continuous heat treatment furnace and a strip steering method using the same.

[0002]

2. Description of the Related Art In a vertical continuous heat treatment furnace, as shown in FIG. 8, a strip 1 enters a vertical furnace body 5 via a constraining roll 2 on the entry side. After ascending inside the furnace body 5 and reversing the running direction with the turn roll 3 provided on the furnace top, the inside of the furnace body 3 is continuously descended to reach the constraining roll 4 on the delivery side. A bridle roll is provided on the exit side of the constraining roll 4.

In the heat treatment of a strip by such a vertical continuous heat treatment furnace, since the strip travels in a long furnace without being restrained, the influence of the shape of the furnace roll, the thermal crown, the influence of the shape of the strip, Meandering tends to occur due to fluctuations in tension and the like, and when large meandering occurs, problems such as uneven winding around the exit side bridle roll arise. For this reason, this type of heat treatment furnace requires a steering device for positively moving the strip in the sheet width direction.

As a steering device provided in a vertical continuous heat treatment furnace, as shown in FIG. 9, there is known a revolving type in which a turn roll 3 in the furnace is turned right and left around a vertical axis Q in accordance with a meandering amount. ing. Japanese Patent Application Laid-Open No. 1-172526 discloses a method in which an auxiliary roll for correcting the meandering is provided on the entry side of the turn roll, and the auxiliary roll is pressed in a direction perpendicular to the plate passing surface while being inclined with respect to the plate passing surface. An idle-type auxiliary roll is pressed against the strip surface at the outlet side of the heat treatment furnace, and the strip is steered by operating the auxiliary roll.
129.

[0005]

However, the steering apparatus for a vertical continuous heat treatment furnace has the following problems.

[0006] In the turning type steering device, the strip 1 is turned in a horizontal plane about a vertical axis Q located away from the center axis O of the turn roll 3 so that the strip 1 enters and exits the turn roll 3. A displacement δ occurs in the plate width direction, and the plate moves in the plate width direction without change. This is a proportional operation, and has an effect of moving the strip 1 simultaneously with the turning of the turn roll 3. However, the movement of the strip 1 cannot be maintained. Therefore, in order to obtain a large amount of movement, it is necessary to increase the turning angle of the turn roll 3, and when the inside of the furnace is narrow as in a vertical continuous heat treatment furnace,
The strip 1 may come into contact with the furnace wall depending on the required movement amount.

[0007] In the case of the auxiliary roll type described in Japanese Patent Application Laid-Open No. 1-172526, addition of auxiliary equipment by providing an auxiliary roll on the entrance side of the turn roll, and securing of a space for pushing the auxiliary roll, It becomes a big problem in a narrow furnace such as a vertical continuous heat treatment furnace. Further, when the vertical continuous heat treatment furnace is a bright annealing furnace, the following problems occur.

[0008] In the case of a vertical continuous bright annealing furnace, the length of the strip suspended by the turn roll is as long as about 37 m and the annealing temperature is as high as about 750 ° C to 1100 ° C. Alone tends to cause elongation. For this reason, the tension in the furnace is made as small as possible due to the requirement for strip flatness, and is usually adjusted to about 0.2 kgf / mm ² . However, Japanese Unexamined Patent Publication No.
In the case of the auxiliary roll type described in Japanese Patent Application Laid-Open Publication No. H11-157, a tension of 0.3 to ² kgf / mm ² is desirable from the viewpoint of preventing the strip from meandering. This is a tension that is too high for the bright annealing furnace, and there is a risk of deteriorating the strip flatness.

On the other hand, in the case of the auxiliary roll type described in Japanese Patent Publication No. 4-65129, steering is performed on the exit side of the heat treatment furnace, so that it is less effective in correcting the meandering of the strip in the furnace. In order to effectively correct the meandering of the strip in the furnace in the vertical continuous heat treatment furnace, it is necessary to perform steering with a turn roll in the furnace.

SUMMARY OF THE INVENTION An object of the present invention is to provide a strip steering apparatus which can use a turn roll only without using an auxiliary roll and can obtain a remarkable meandering correction effect with a small roll operation amount.

It is another object of the present invention to provide a method of steering a strip in which an effective meandering correction is performed only by a turn roll and there is no possibility that permanent deformation such as an ear wave is generated at a strip edge.

[0012]

As shown in FIG. 1, a steering device according to the present invention comprises a turn roll 3 for turning a strip, and a line extending in a direction perpendicular to a center point m of a center axis O of the turn roll 3. M is a turning operation axis, and the turn roll 3 is turned so that the turning operation axis M rotates around a point n on the turning operation axis M in a plane P including the center axis O and the turning operation axis M. The tilting mechanism tilts the turning mechanism so that the plane P including the center axis O of the turn roll 3 and the turning operation axis M tilts about the center axis O of the turn roll 3 before turning or a line along the same. And a mechanism.

In FIG. 1, a broken line shows a state before the turn roll 3 is operated. The two-dot chain line indicates a state in which the turn roll 3 has turned at an angle θ about one point n on the turning operation axis M. The solid line represents a plane P including the center axis O and the turning operation axis M of the turn roll 3 after the turn roll 3 turns.
Shows a state in which the turn roll 3 is tilted at an angle α about the center axis O of the turn roll 3 before turning. N is the turning center axis of the turn roll 3, which is perpendicular to the plane P before tilting, and the turning center point n of the turn roll 3 is the intersection of the turning center axis N and the plane P.

The turning center point n of the turn roll 3 is preferably the intersection of the turning operation axis M and the entrance roll peripheral surface.
A plane P including the central axis O and the turning operation axis M of the turn roll 3
Is preferably the center axis O of the turn roll 3.

In the steering method according to the present invention, the turning center point n of the steering device, particularly the turn roll 3, is the intersection of the turning operation axis M with the entrance roll peripheral surface, and the center axis O of the turn roll 3 and the turning point. When the strip is steered in the plate width direction by using a steering device in which the tilt center of the plane P including the operation axis M is the center axis O of the turn roll 3, the turning angle θ of the turn roll is set so that Expression 1 is satisfied. And the tilt angle α of the surface P.

[0016]

(Equation 1) Here, L ₀ : distance between the turn roll and the outgoing side constraining roll when the steering operation is not performed (mm) σ _y : stress of the strip allowed for the steering operation (kgf / mm ² ) E: longitudinal elasticity of the strip Coefficient (kgf / mm ² ) W: Strip width (mm) θ: Turn roll turning angle (°) α: Turning surface tilt angle (°)

Hereinafter, the reason why an effective strip movement is performed by the steering device of the present invention and the reason that permanent deformation such as ear waves is prevented by the steering method of the present invention will be described.

As a method of steering a strip by a turn roll, there is the above-mentioned turning type (FIG. 9). A tilting type shown in FIG. 10 is also known. In the turning type steering apparatus shown in FIG. 9, the turn roll 3 turns in a horizontal plane about a vertical pivot (turning center axis N), so that the strip 1 enters and exits from the position where the strip 1 enters and exits the turn roll 3. Direction displacement δ occurs and moves in the plate width direction as it is. This is a proportional operation called the principle of carrying, and has the effect of moving the strip 1 simultaneously with the turning of the turn roll 3. However, since the movement of the strip 1 cannot be sustained, it is necessary to increase the turning angle θ of the turn roll 3 in order to obtain a large amount of movement, and when the inside of the furnace is narrow like a vertical continuous heat treatment furnace, The strip 1 may come into contact with the furnace wall depending on the required movement amount.

On the other hand, in the tilt type steering device shown in FIG. 10, the center axis O of the turn roll 3 tilts in a vertical plane including the center axis O. In this method, the strip 1 enters the turn roll 3 while being inclined with respect to the perpendicular to the roll center axis O, so that the strip 1 moves in the sheet width direction as the turn roll 3 rotates. This is the same as helically winding a thread around a cylinder, and is called the principle of thread winding. The movement of the strip 1 in the width direction of the strip is conceptually an integral operation, and continues until the strip 1 enters the turn roll 3 vertically. Therefore, although a relatively large moving amount can be obtained, initial responsiveness is poor.

On the other hand, in the steering device of the present invention, as shown in FIG. 1, the turn roll 3 is turned at an angle θ about a turning center axis N perpendicular to the plane P.
The plane P tilts at an angle α about the center axis O of the turn roll 3 before turning. It should be noted here that the direction of tilting of the turn roll 3 is different from that of the conventional tilting method. That is, conventionally, as shown in FIG. 10, the turn roll 3 is tilted right and left, but in the present invention, the plane P including the rotation axis O and the turning motion axis M of the turn roll 3 is used.
Tilts back and forth.

For this reason, in the present invention, when the turn roll 3 does not turn, even if the plane P is tilted, the turn roll 3
Does not tilt, but merely pivots about its central axis O. Only when the surface P is tilted back and forth while the turn roll 3 is turned, the turn roll 1 is tilted, and a tilt angle α proportional to the turning angle θ can be obtained. As a result, excellent responsiveness is secured by the principle of transport by turning, and the principle of thread winding by tilting appears in addition to the response movement, and it corresponds to the tilt angle α even after instantaneous movement by the principle of transport. As the movement continues, a larger movement amount can be obtained than in the conventional tilting.

Incidentally, when the surface P is tilted left and right while the turn roll 3 is turned, the strip that has moved instantaneously in the turning direction moves in the tilting direction of the surface P. It is difficult to control its movement because it is sensitive to angles.
Further, when the tilting mechanism is turned while the turn roll 3 is tilted left and right, the strip moves instantaneously in the turning direction while moving in the tilting direction, and the instantaneous movement adversely affects the strip. There is. Further, it is considered that such a strip movement pattern has no significant meaning in actual operation. Therefore, in the present invention, the plane P is tilted back and forth.

The center of tilt of the plane P does not necessarily need to be the center axis O of the turn roll 3 before turning, but the center axis O
However, if this deviates from the central axis O of the turn roll 3, the path line of the strip 1 moves with the tilt of the surface P, and depending on the amount of movement, contact with the furnace wall occurs. The center axis O of the turn roll 3 is optimal.

The turning center point n of the turn roll 3 is preferably an intersection point between the turning operation axis M and the roll peripheral surface, particularly an intersection point on the strip entry side. When the turning center point n is on the center axis O of the turn roll 3, that is, at the midpoint m, the strip 3 is twisted evenly on the entrance side and the exit side of the turn roll 3, and the movement of the strip 1 by carrying is performed. The movement is not obtained because the entry side and the exit side are offset. From this point, the turning center point n needs to be located on the turning motion axis M excluding the middle point m. However, if the turning center point n is far away from the middle point m, the strip 3 is largely swung right and left, and the pass line And the internal stress of the strip 3 increases, causing deformation such as ear waves. On the other hand, when the turning center point n is located at the intersection of the turning motion axis M and the entrance surface of the roll, the strip 3 is twisted about the turning center axis N on the entry side of the turn roll 3. There is no change in position and deformation is suppressed to a small value.

In the case of the outgoing intersection, a phenomenon occurs in which the incoming strip is moved in the plate width direction.

Next, the reason why permanent deformation such as ear waves is prevented by the steering method of the present invention will be described with reference to FIG.

FIG. 2 is a plan view (a) and a side view (b) schematically showing a change in the posture of the strip when the turn roll turns and tilts in the steering apparatus of the present invention. The turning center point n of the turn roll 3 is an intersection point where the turning motion axis M intersects with the entrance roll peripheral surface.
Is the central axis O.

With the steering operation (turning + tilting) of the turn roll 3, the edge position of the strip 1 changes from dr to cr. Assuming that the width of the strip 1 is W, the diameter of the turn roll 3 is D, the turning angle is θ, and the tilting angle is α, the horizontal projection displacement distance (Δ1) of the strip edge in the roll center axis direction is represented by Expression 2. The horizontal projection displacement distance (Δ2) in a direction perpendicular to the central axis is expressed by Expression 3.

Therefore, the horizontal projection displacement distance cd is expressed by Expression 4. Further, the vertical displacement distance (Δ3) is represented by Expression 5.

[0030] Then, the distance from the turn roll 3 before the posture change to the exit side constraining rolls 4 When (center distance) of L _0, strip edge length between the rolls by the steering operation is d-r (= L ₀₎ To cr (= L), and becomes Equation 6, so that the length change ΔL of the strip edge accompanying the steering operation becomes Equation 7. If this length change ΔL falls within the elastic deformation range of the strip, as in Expression 8, since edge deformation such as ear waves due to steering operation is prevented, Expression 1 is established.

[0031]

(Equation 2)

[0032]

(Equation 3)

[0033]

(Equation 4)

[0034]

(Equation 5)

[0035]

(Equation 6)

[0036]

７L = L−L ₀

[0037]

(Equation 8)

[0038]

Embodiments of the present invention will be described below. 3 is a side view of the steering device according to the embodiment of the present invention, FIG. 4 is a plan view of the steering device, and FIG. 5 is a side view showing a tilting operation in the steering device.

The turn roll 3 provided on the furnace top of the vertical continuous heat treatment furnace is horizontally mounted on the revolving frame 6, as shown in FIGS. The revolving frame 6 is mounted on a tilting frame 8 via a revolving roller 7, and a vertical revolving center in which the turn rolls 3 are in contact with the entry side peripheral surface by the revolving cylinders 9, 9 on both sides. Axis N
(See FIG. 1).

The tilting frame 8 is mounted on the fixed frame 10. The mounting surface 11 is the tilting frame 8
Is the central axis O of the turn roll 3 before turning (before the posture change).
It has an arcuate surface as viewed from the side so as to tilt about (see FIG. 1). Then, as shown in FIG. 5, the tilting frame 8 is driven on the fixed frame 10 by the tilting cylinder 12.

Next, a method of using the steering device will be described.

In the first usage method, the turning frame 6 is turned while the tilting frame 8 is tilted at a predetermined angle. Even if the tilting frame 8 is tilted, if the turning frame 6 is not turning, the attitude of the turn roll 3 does not change. In the state where the tilting frame 8 is tilted, the turning frame 6
Is turned, the turn roll 3 is brought into a state as shown in FIG. 1 and tilts at an angle corresponding to the turning angle. As a result, excellent responsiveness is secured by the principle of carrying by turning, and the principle of thread winding by tilting is expressed in addition to the response movement, and it corresponds to the tilting angle α even after instantaneous movement by the principle of carrying. And the movement continues,
A larger moving amount than the conventional tilting can be obtained in a short time. This method is effective when meandering continues, such as when the strip has a camber.

In the second method of use, the tilting frame 8 is made horizontal and the turning frame 6 is turned. Thereby, excellent responsiveness is secured by the principle of transport by turning.
However, the movement does not last. If the meandering continues thereafter, the tilting frame 8 is tilted so that the turn roll 3 is tilted. This method is effective when the meandering of the strip 1 suddenly becomes large. First, the strip 1 is instantaneously moved in the anti- meandering direction by carrying by turning, and the meandering correction operation can be continued gently. When the revolving frame 6 is revolved, the strip 1 moves instantaneously, but the movement is temporary and does not continue, so that a large moving amount cannot be obtained. In order to maintain the meandering correction operation and secure a large moving amount, the tilting frame 8 needs to be tilted.

When the second method is not required, it is not necessary to drive the tilting frame 8, so that the tilting frame 8 may be mounted at a predetermined angle.

The present invention was carried out in a vertical continuous bright annealing furnace whose specifications are shown in Table 1. 0.6mm thick, 1035m wide
FIG. 6 shows a meandering correction effect (amount of strip movement) when a 10 m / strip (stainless steel strip) is passed at 10 m / min.
Shown in The turning angle θ of the turning frame (turn roll) was ± 2.5 °.

[0046]

[Table 1]

The tilting angle α of the tilting frame (plane P) is 0 °
In this case, even if the turn roll is turned, the strip is only temporarily moved by about 50 mm by turning. However, if the turn roll is turned while the tilt angle α is set to 5 °, a correction amount of 50 mm can be obtained instantaneously. This is carried by turning. After that, the amount of correction further increases from 50 mm by the principle of winding by tilting, and reaches approximately 200 mm after several minutes. This is a correction amount that cannot be obtained by simply carrying by turning.

The tilt angle α is 0 ° and the turning angle is +2.
In the case of 5 °, the meandering correction amount decreases with the passage of time because the strip at this time has a camber. When the turning angle is + 2.5 ° and -2.5 °
The reason why the tendency is different in the case of is that another strip is passed.

FIG. 7 shows that the turning angle θ of the turn roll is ± 2.5.
°, the result when tilting the turn roll left and right at an angle corresponding to the tilt angle α of the tilting frame (plane P) of 5 °. Since only the principle of winding by tilting is exhibited, the response is poor, and the final meandering correction amount is also about 150 mm.

When the turning angle θ of the turn roll is ± 2.5 ° and the tilting angle α of the tilting frame (plane P) is 5 °, Equation 1 is obtained.
Is about 65 mm. On the other hand, the left side of Expression 1, that is, the limit elastic deformation of the strip in this case is 93 mm. Since Equation 1 was satisfied, no permanent distortion such as ear waves occurred.

[0051]

As is apparent from the above description, the steering apparatus of the present invention moves the strip in the plate width direction only by the turn roll without using the auxiliary roll by the combination of turning and tilting. Therefore, it is possible to solve the problem of space, the problem of increase in tension, and the like associated with the use of the auxiliary roll. In addition, excellent responsiveness and a large meandering correction amount can be obtained as compared with a conventional apparatus using only a turn roll. Therefore, effective meandering correction can be performed in a place where space is limited, such as a vertical continuous heat treatment furnace.

Further, the steering method of the present invention suppresses the extension of the strip edge caused by the operation of the turn roll within the elastic deformation range, thereby preventing permanent deformation such as ear waves in addition to the above effect. To play.

[Brief description of the drawings]

FIG. 1 is a perspective view of a turn roll which exaggerates a roll operation in a steering device of the present invention.

FIGS. 2A and 2B are two side views schematically showing a change in the attitude of a strip when a turn roll turns and tilts in the steering device of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is a side view of the steering device according to the embodiment of the present invention.

FIG. 4 is a plan view of the steering device.

FIG. 5 is a side view showing a tilting operation in the steering device.

FIG. 6 shows a conventional meandering correction effect (turning only) according to the present invention.
3 is a table shown in comparison with the case of FIG.

FIG. 7 is a table showing a meandering correction effect by a conventional steering device (a device that only tilts).

FIG. 8 is a schematic side view of a vertical continuous heat treatment furnace.

FIGS. 9A and 9B are two views of a turn roll in a conventional steering device (a device that only turns) in an exaggerated manner, wherein FIG. 9A is a side view and FIG. 9B is a plan view.

FIG. 10 shows a conventional steering device (a device that only tilts).
It is a perspective view of a turn roll which exaggerates and shows the roll operation in.

[Explanation of symbols]

 Reference Signs List 1 strip 3 turn roll 6 turning frame 8 tilting frame 9 turning cylinder 10 fixed frame 12 tilting cylinder

Claims (3)

[Claims] 1. A turning roll for turning a strip, and a line extending in a direction perpendicular to a center point of a center axis of the turning roll is defined as a turning motion axis, and the turning motion axis includes an axis including the center axis and the turning motion axis. A turning mechanism for turning the turn roll so as to rotate about one point on the turning operation axis, and a plane including the center axis of the turn roll and the turning operation axis being along or along the center axis of the turn roll before turning. And a tilting mechanism for tilting the turning mechanism so as to tilt about the line. 2. The turning roll center point is the intersection of the turning operation axis and the entrance roll peripheral surface, and the tilting center of the plane including the turn roll center axis and the turning operation axis is the turn roll center axis. The strip steering device according to claim 1, wherein: 3. When the strip is steered in the plate width direction using the strip steering apparatus according to claim 2, the turning angle θ of the turn roll and the tilt angle α of the turning surface are set so that the following expression is satisfied. A strip steering method, characterized in that: Here, L ₀ : distance between the turn roll and the outgoing side constraining roll when the steering operation is not performed (mm) σ _y : stress of the strip allowed for the steering operation (kgf / mm ² ) E: longitudinal elasticity of the strip Coefficient (kgf / mm ² ) W: Strip width (mm) θ: Turn roll turning angle (°) α: Tilt angle of the plane including the center axis of the turn roll and the turning operation axis (°)