JPS644845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing strip meandering in a rolling line, and more specifically, a method for preventing strip meandering while width rolling is performed by vertical rolls of a vertical rolling mill, and implementation of the method. This invention relates to a vertical rolling mill that is used directly in the industry.

Conventionally, in a hot rolling line, a horizontal rolling mill and a vertical rolling mill are arranged along a strip conveying line, and the conveyed strip is sequentially rolled to a constant thickness.
Although the strip is rolled to a constant width, due to various circumstances, there has been a problem in that meandering occurs as the strip is conveyed.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a method for effectively preventing strip meandering that occurs in a rolling line, and a vertical rolling mill that can be used directly to carry out the method.

The meandering prevention method of the present invention detects the meandering amount of a strip while rolling the strip in the width direction with the vertical rolls in a rolling line equipped with a vertical rolling mill that rolls the strip in the width direction with a pair of vertical rolls. and by moving at least one of the vertical rolls in the longitudinal direction of the strip according to the detected meandering amount,
It is characterized in that the mutual positions of both vertical rolls are shifted by a predetermined amount in the longitudinal direction of the strip.

Further, the vertical rolling mill of the present invention is a vertical rolling mill that rolls a strip in the width direction using a pair of vertical rolls, and in which both of the pair of vertical rolls are moved in the width direction of the strip to achieve a desired rolling reduction. a first moving mechanism for obtaining force; a meandering amount detector for detecting the meandering amount of the strip; and a meandering amount detector for detecting at least one of the two vertical rolls based on the meandering amount detected by the meandering amount detector. It is characterized by comprising a second moving mechanism for moving one of the vertical rolls in the longitudinal direction of the strip to shift the relative positions of both vertical rolls in the longitudinal direction of the strip.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an example of an apparatus for carrying out the invention.
In the figure, numeral 1 indicates a strip, which is conveyed on the rolling line in the direction of arrow A. This strip 1 is
The material is rolled in the thickness direction and the width direction by the horizontal rolls 2 of a horizontal rolling mill and the vertical rolls 3 of a subsequent vertical rolling mill arranged along the rolling line.

In this case, a pair of left and right vertical rolls 3 of a vertical rolling mill
As shown in detail in FIGS. 2 and 3, each of the strips 1 is horizontally moved in the longitudinal direction of the strip 1 by an offset cylinder (second moving mechanism) 4. That is, the vertical roll 3 is supported by the inner housing 5, and the inner housing 5 is supported by the outer housing 6 via a plurality of offset cylinders 4a...4f... disposed on both sides thereof, and each of these cylinders 4a...4f...
... are operated in conjunction with each other, so that the vertical roll 3 can move in the directions of arrows RO and C shown in FIG. 3 and can be stopped at any desired position.

Further, the vertical roll 3 is moved in the width direction of the strip 1 by a rolling screw (first moving mechanism) 7 to obtain a desired rolling force. The reduction screw 7 is connected to the inner housing 5 via a spherical seat 8, and even when the vertical roll 3 is moved in the longitudinal direction of the strip 1 by the offset cylinders 4a...4f... , the rolling force can be applied to the vertical rolls 3 without any trouble.

This configuration is common to the left and right vertical rolls 3. The movement of the left and right vertical rolls 3 thus configured to be freely movable is controlled by a control circuit described below.

That is, this control circuit receives the strip meandering amount detector 9 provided at the front stage (upstream side) of the horizontal roll 2 of the horizontal rolling mill and the detection signal _P1 from the detector 9, and simultaneously The offset amount setting signal _P2 is inputted to a calculation device 10 which calculates the offset amount, and the offset amount signal _P3 from this calculation time 10 is inputted to the left and right offset cylinders 4, 4a, . . . , 4f. It has a control signal 11 that issues operation commands P ₄ and P ₅ , and operates the cylinder according to the amount of meandering of the strip to change the mutual position of both vertical rolls 3 in the longitudinal direction of the strip in order to eliminate the meandering. It is designed to perform a quantitative offset (shift).

Therefore, the method of the present invention is automatically implemented by the apparatus having the above configuration as follows.

When a meandering phenomenon occurs during the conveyance of the strip 1, the amount of meandering is detected by the meandering amount detector 9, and based on the detection result, the movement of the vertical rolls 3 is automatically controlled and the two vertical rolls 3 are The position is offset by a predetermined amount, thereby correcting the meandering phenomenon in the latter stage (downstream side) of the vertical roll 3.

That is, in FIG. 1, the strip 1 is now in the normal state shown by the two-dot chain line, and the upstream side (rear end side) of the strip 1, with the vertical rolls 3, 3 as the fulcrum, as shown by the solid line, when viewed from the front side in the conveyance direction. If the downstream side (tip side) meandered to the right side and to the left side, the meandering amount on the upstream side is detected by the meandering amount detectors 9, and based on the detected meandering amount, the The vertical roll 3 on the left side (the upper side in FIG. 1) is moved forward by a moving amount L from the position shown by the two-dot chain line to the position shown by the solid line, and thereby both vertical rolls 3, 3 are moved forward by an offset amount L. offset with . Then, the rolling force in the width direction by both vertical rolls 3, 3 is applied to the strip 1.
Then, the bending moment M=P・L expressed as the product of the rolling force P and the offset amount L acts clockwise in Fig. 1, and this bending moment M
As a result, the strip 1 is returned to its normal position and the meandering phenomenon is corrected.

Furthermore, when the strip 1 meanders in the opposite direction to the above, the vertical roll 3 on the right side (lower side in Fig. 1) when viewed from the front in the traveling direction moves forward, thereby causing the strip to meander in the opposite direction. As a result, a counterclockwise bending moment acts on the strip 1 and the meandering is corrected.

The above operations are automatically performed by feedback control, and meandering is prevented by setting the optimum offset amount every moment based on the meandering amount and meandering direction. In addition, in this case, the vertical rolls 3, 3 perform the work of preventing meandering, and of course perform the original rolling in the width direction, but the rolling force P changes even when the vertical rolls 3, 3 are offset. Therefore, the width of the strip 1 can always be kept constant.

In the above embodiment, both vertical rolls 3 are configured to be movable, but only one of them may be configured to be movable. In any case, the mutual positions of both vertical rolls 3 can be offset. Just configure it.

As explained above, the meandering prevention method of the present invention moves at least one of a pair of vertical rolls in the longitudinal direction of the strip, thereby adjusting the relative positions of both vertical rolls in accordance with the meandering amount of the strip. Since the strip is shifted in the width direction, it is possible to prevent the strip from meandering while width rolling is performed and the rolling force in the width direction is kept constant.

Further, the vertical rolling mill of the present invention includes a first moving mechanism for moving both of the pair of vertical rolls in the width direction of the strip, a meandering amount detector for detecting the meandering amount of the strip, and a meandering amount detector for detecting the meandering amount of the strip. A second step for moving at least one of the two vertical rolls in the longitudinal direction of the strip based on the meandering amount detected by the meandering amount detector to shift the mutual positions of the two vertical rolls in the longitudinal direction of the strip. Since the structure is equipped with a moving mechanism, a sufficient rolling force in the width direction of the strip can always be obtained by the first moving mechanism, and the rolling force by the first moving mechanism can be kept constant. The vertical roll can be freely moved in the longitudinal direction of the strip by the second moving mechanism, thereby preventing meandering, and is therefore suitable for use in the above-mentioned direction. .

[Brief explanation of drawings]

FIG. 1 is a plan view for explaining an embodiment of the present invention, FIG. 2 is a plan view for explaining a vertical roll moving mechanism, and FIG. 3 is a longitudinal sectional view thereof. 1...Strip, 3...Vertical roll, 4,4a
~4f... Offset cylinder (second moving mechanism), 7... Lowering screw (first moving mechanism),
9... Meandering amount detector, 10... Arithmetic device, 11...
…Control device.

Claims (1)

[Claims] 1. In a rolling line equipped with a vertical rolling mill that rolls a strip in the width direction using a pair of vertical rolls, the meandering amount of the strip is detected while the strip is rolled in the width direction by the vertical rolls. , the mutual position of both vertical rolls is shifted by a predetermined amount in the longitudinal direction of the strip by moving at least one of the vertical rolls in the longitudinal direction of the strip according to the detected meandering amount. How to prevent strip meandering. 2. In a vertical rolling mill that rolls a strip in the width direction using a pair of vertical rolls, a first moving mechanism for moving both of the pair of vertical rolls in the width direction of the strip to obtain a desired rolling force. a meandering amount detector for detecting the meandering amount of the strip; and moving at least one of the two vertical rolls in the longitudinal direction of the strip based on the meandering amount detected by the meandering amount detector. and a second moving mechanism for shifting the mutual positions of both vertical rolls in the longitudinal direction of the strip.