JPH01172526A - Method for preventing snaking in continuous strip treatment line - Google Patents

Abstract

PURPOSE:To surely prevent snaking of passed strip while preventing the development of contraction or buckling by inclining an auxiliary roll arranged at inlet side of passing roll for the strip, pushing the strip and regulating the position of the auxiliary roll to the specific range. CONSTITUTION:In a strip continuous line in a vertical furnace, the auxiliary roll 2 as tiltable is arranged at the inlet side of hearth roll 1. This auxiliary roll 2 is inclined to strip 3 width direction at angle theta, and by this roll, the strip 3 is pushed to right angle direction to the passing strip line. In the method for preventing the snaking in the continuous treating line for the above strip 3, the auxiliary roll 2 is pushed so as to satisfy the following condition. 5<=Y<=X<=12.5, 0.65<=Y/DH<=2.0, 0.07<=X/DH<=0.28 (wherein, DH: diameter of the hearth roll 1, X distance between axial center of the auxiliary roll 2 and the passing strip line before pushing, Y: distance between axial center of the hearth roll 1 and the axial center of the auxiliary roll 2). By this method, by applying much tension to outside of the snaked strip 3, the strip is pushed back to correct the snaking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing meandering in a continuous strip processing line.

[Conventional technology and its problems]

In the continuous strip line of a vertical furnace, the strip meanderes due to the shape of the hearth roll in the furnace, the effect of thermal crown, the shape of the original plate, tension fluctuations, etc. Conventionally, countermeasures against such meandering have been taken, such as making the crown of the hearth roll in a shape that makes meandering less likely, and using a steering roll that can swing the hearth roll left and right according to the meandering. In the latter case, there is a disadvantage that constriction occurs depending on the amount of crown, etc., and in the latter case, there is a disadvantage that the equipment is complicated and the equipment cost is high.

For this reason, in Japanese Patent Application Laid-Open No. 60-3 [1626], an auxiliary roll that can be tilted is provided close to the strip surface to be threaded on the entry side of the hearth roll, and this auxiliary roll meanders. A device has been proposed in which the strip is pushed in at an angle to the strip, and the strip is pushed back to the line center. However, according to the inventors' studies, if the distance of the auxiliary roll to the pushing melon and hearth roll is not selected sufficiently, there may be problems such as not being able to sufficiently prevent meandering of the strip or causing squeezing. It turns out.

[Means to solve the problem]

In view of these problems, the inventors of the present invention have repeatedly investigated a method for stably threading the strip without causing meandering or constriction in the meandering correction method using the above-mentioned auxiliary roll. As a result, the position of the auxiliary roll (pushing amount and distance i from the hearth roll)
This has a strong correlation with preventing squeezing and correcting meandering, and by setting the auxiliary roll at the optimal position relative to the strip passing roll, etc., you can effectively correct meandering without causing squeezing in the strip. I found out what I can do.

That is, in the present invention, a tiltable auxiliary roll is provided on the entrance side of the threading roll, the auxiliary roll is tilted in the width direction of the strip, and the auxiliary roll is used to push the strip in a direction perpendicular to the threading line. The basic feature of the method for correcting meandering of a body is to push the band-shaped body using an auxiliary roll so that the following conditions are satisfied.

5≦(Y/X)≦12.5 0.65≦(Y/X)≦2. O H 0107≦ (Y/X)≦0.28 However, Dll: Threading roll diameter (m+*: I
X: Distance in the direction perpendicular to the threading line between the axis of the auxiliary roll contacting the strip side end on the side displaced toward the roll center due to meandering and the threading line before pushing by the auxiliary roll. . [mm] Y Distance in the direction of the threading line (threading line when the auxiliary roll is not pushed) between the axis of the double strip roll and the axis of the auxiliary roll (mm) The details of the present invention will be explained below as a continuous strip processing line. This will be explained by taking as an example the correction of meandering strips.

Figures 1 and 2 show the implementation status of the present invention.
2 is a hearth roll (threading roll), and 2 is an auxiliary roll disposed on the strip entry side of this hearth roll, and the auxiliary roll 2 is pivotally supported so as to be tiltable in the width direction of the strip.

3 and 4 show the meandering correction effect by the auxiliary roll 2. Now, while the line is running, a meandering occurs in the strip 3, and the center of the meandering is moving from the center of the roll to the DR side.
Suppose that there is a deviation. At this time, AS is detected, the auxiliary roll 2 is tilted in the strip width direction (angle of inclination θ), and pushed in by an appropriate amount according to AS. For this reason, the line tension on the DR side becomes higher than on the OP side, and as a result, the force F acts on the surface of the strip 3 pressed by the auxiliary roll 2 from the DR side to the OP side, correcting the meandering.

In the meandering correction using the auxiliary roll 2, in the present invention, D! , double plate roll diameter (mm)
: The distance in the direction perpendicular to the strip passing line between the axis of the auxiliary roll that contacts the strip side end on the side displaced toward the roll center due to meandering and the strip passing line before pushing by the auxiliary roll. [Dragon] Y Distance between the axis of the double plate roll and the axis of the auxiliary roll in the direction of the sheet threading line (the sheet threading line before pushing by the auxiliary roll).
In this case, the meandering of the strip 3 is corrected by setting the position of the auxiliary roll 2 as follows.

5 ≦ (Y/X) ≦ 12.5 0.65 ≦ (Y/X) ≦ 2.0 D) I 0007 ≦ (Y/X) ≦ 0.28 DI+ Figure 5 shows the inclination angle θ of the auxiliary roll 2. By variously changing Y/
The study investigated the influence of the value of X on preventing meandering, and according to the results, the larger θ is, the greater the meandering correction effect is. It can be seen that the meandering prevention effect is small in the range of 5 to 12.5, and that an excellent meandering prevention effect is obtained in the range of 5 to 12.5.

In addition, FIG. 6 shows the effect of Y/DH and
This study investigated the relationship with DH, and found that in order to properly prevent strip constriction and effectively correct meandering, the above Y
It can be seen that in addition to the regulation (c), it is necessary to place the auxiliary roll 2 in a position that satisfies the following formula.

0.65≦(Y/X)≦2.0 H 0,07≦(Y/X)≦0.28 However, from the same figure, preferably, It is desirable to satisfy the following conditions.

Next, in the present invention, from the viewpoint of preventing meandering, it is preferable that the strip tension is in the range of 0.3 to 2 kg/-. That is, the meandering of the strip increases as the tension decreases, and if the tension is less than 0.1 kg/-, the meandering cannot be sufficiently suppressed even with the use of an auxiliary roll. On the other hand, the tension is 2
If it exceeds -0 kg/mJ, not only is the occurrence of constriction observed, but the meandering prevention effect is also reduced. This is because the frictional force between the hearth roll 1 and the strip 3 becomes too large and exceeds the force with which the auxiliary roll 2 pushes the strip. FIG. 7 shows the effect of strip tension on the anti-meandering effect.

Note that if the diameter d of the auxiliary roll 2 is too small, there is a risk that the strip will bend.
Preferably, the diameter is 0 or more.

The method of the present invention described above can be applied to all types of continuous processing lines, including vertical furnaces for continuous annealing of strips, pickling lines, electroplating lines, and equipment before and after continuous cold rolling mills. It is also possible to target not only steel strips but also aluminum, electromagnetic steel sheets, etc.

〔Example〕

Example 1 In a continuous aluminum plate line (vertical continuous line) under the following conditions, an auxiliary roll was installed on the hearth roll entrance side in the middle of the line, and a meandering correction test was conducted.

・Line speed 10g+, p, Im, ・Strip size 350mm width x 70μm thickness ・Strip material and material characteristics Material 1N-30 Characteristics Yield point (at 24℃) 3.5kg/mj Tensile strength ('') 9.1kg/mA - Hearth roll Distance between hearth rolls: 3520 Shape: Cylindrical smooth roll size: 14 (lφ x 55o) Width: Auxiliary roll shape: Cylindrical smooth roll size: 45φ For the line, the pushing amount is OP under the conditions in Table 1.
The auxiliary roll was pushed in so that the side was greater than the DR side, and the tendency of line movement and tendency of squeezing to occur were examined. The results are also shown in Table 1.

* * * * [Effects of the Invention] According to the present invention described above, in the method of correcting meandering by tilting the auxiliary roll and pushing in the strip, the position of the auxiliary roll can be defined within a specific range. This makes it possible to reliably prevent meandering while preventing the occurrence of constriction and buckling.

[Brief explanation of the drawing]

1 and 2 show the state of implementation of the present invention, with FIG. 1 being a side view and FIG. 2 being a cross-sectional view taken along the line ■-■ in FIG. FIGS. 3 and 4 are explanatory diagrams showing the meandering correction effect by the auxiliary roll. FIG. 5 shows the influence of Y/X on meandering prevention at various auxiliary roll inclination angles. Figure 6 shows the effect of Y/D on the squeezing prevention and meandering prevention effects. This shows the relationship between and X/Du. FIG. 7 shows the influence of strip tension on the meandering prevention effect. Figure 4 Figure 5 Y/X

Claims (1)

[Claims] By providing a tiltable auxiliary roll on the entry side of the threading roll, tilting the auxiliary roll in the width direction of the strip, and using the auxiliary roll to push the strip in a direction perpendicular to the threading line. A method for preventing meandering in a continuous strip processing line, which method comprises pushing the strip using an auxiliary roll so as to satisfy the following conditions. 5≦(Y/X)≦12.5 0.65≦(Y/D_H)≦2.0 0.07≦(X/D_H)≦0.28 However, D_H: Threading roll diameter [mm] X: The distance in the direction perpendicular to the strip passing line between the axis of the auxiliary roll that contacts the strip side end on the side displaced toward the roll center due to meandering and the strip passing line before pushing by the auxiliary roll. [mm] Y: Distance between the axis of the threading roll and the axis of the auxiliary roll in the direction of the threading line (the threading line before pushing by the auxiliary roll) [mm]