JP2004160530A - Camber correction method for hot rolled material - Google Patents

Abstract

Provided is a hot-rolled material camber correcting method capable of correcting a camber of a hot-rolled material by a relatively simple method and correcting a large camber that cannot be corrected only by conventional different peripheral speed rolling. I do.
In the width rolling of a hot-rolled material using an edger rolling mill, the width of the left and right vertical rolls in the edger rolling machine is reduced and the horizontal rolling is performed, and then the horizontal rolling is performed. A camber correction method for a hot-rolled material, wherein the camber is corrected. Preferably, different peripheral speed rolling is performed by changing the peripheral speed of the left and right vertical rolls in the edger rolling mill.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for correcting a camber of a hot-rolled material in width rolling of a hot-rolled material using an edger rolling mill.
[0002]
[Prior art]
The hot rolled material has heat unevenness in the sheet width direction and the longitudinal direction, and this is mainly caused by camber (lateral bending) that is bent in the sheet width direction by about several tens of mm with respect to the length of the rolled material of 10 m. ) Occurs.
In the width rolling of a hot-rolled material using an edger rolling mill, various proposals have been made regarding a method of correcting the camber of the hot-rolled material.
For example, Japanese Patent Application Laid-Open No. 59-13507 discloses a method in which the camber is corrected by changing the peripheral speed of the left and right vertical rolls of the edger and performing different peripheral speed rolling.
However, this method requires a high-precision roll speed control because the camber is corrected by changing the peripheral speed of the vertical roll, and when the camber amount is large, the camber can be sufficiently corrected only by the different peripheral speed rolling. In some cases it was not possible.
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 59-13507 (page 1)
[0004]
[Problems to be solved by the invention]
The present invention solves the problems of the prior art described above, and can correct the camber of a hot-rolled material by a relatively simple method, and corrects a large camber that cannot be corrected only by the conventional different peripheral speed rolling alone. An object of the present invention is to provide a hot-rolled material camber correction method that can perform the method.
[0005]
[Means to solve the problem]
As a result of intensive studies to solve the above-mentioned problems, the present invention has a relatively simple method by modifying the camber of a hot-rolled material by changing the amount of reduction of left and right vertical rolls in an edger rolling mill. The present invention provides a hot-rolled material camber correction method capable of correcting the camber of a hot-rolled material, and correcting a large camber that cannot be corrected only by conventional different peripheral speed rolling. The following contents are as described in the claims.
[0006]
(1) In width rolling of a hot-rolled material using an edger rolling mill, horizontal rolling is performed after changing the amount of reduction of the left and right vertical rolls in the edger rolling machine, and then performing horizontal rolling, whereby the hot-rolled material is rolled. A method for correcting camber of a hot-rolled material, the method comprising correcting camber.
(2) The method for correcting a camber of a hot-rolled material according to (1), wherein the peripheral speed of the left and right vertical rolls in the edger rolling mill is changed to perform different peripheral speed rolling.
[0007]
(3) a camber measuring step of measuring the camber of the hot-rolled material on the entry side of the edger mill;
A reduction amount determining step of determining the reduction amount of the left and right vertical rolls in the edger rolling mill based on the measured camber,
An edger rolling step of performing width reduction based on the determined reduction amount,
A horizontal rolling step of performing horizontal rolling of the hot rolled material subjected to the edger rolling.
(4) In the edger rolling step, the peripheral speeds of the left and right vertical rolls in the edger rolling mill are determined based on the measured camber to perform different peripheral speed rolling. A method for correcting camber of hot rolled material.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram showing a flow of a method for controlling a camber of a hot-rolled material according to the present invention.
In FIG. 1, first, the camber of the hot-rolled material on the entry side of the edger rolling mill is measured.
Although the method of measuring the camber is not limited, for example, a method of measuring the displacement (mm) of the center axis of the rolled material using a CCD camera is preferable.
[0009]
Next, the amount of reduction of the left and right vertical rolls in the edger mill is determined based on the measured camber.
The relationship between the direction of the camber (right or left), the amount of camber (mm), and the amount of reduction (mm) of the vertical roll is tabulated, and based on this table, the reduction amount (mm) of each of the left and right vertical rolls is determined. ).
The width reduction is performed by the vertical roll of the edger rolling mill based on the determined left and right different reduction amounts.
By setting the reduction amount of the left and right vertical rolls to different values, the uneven thickness of the rolled material due to the width reduction is different between the left and right sides, so that when the horizontal rolling is performed, a reaction force can be generated in the direction of correcting the camber.
[0010]
In the case where a camber is generated in a part of the rolled material in the longitudinal direction, such a partial correction of the camber is performed by changing the amount of reduction of the left and right vertical rolls only in the portion where the camber is generated. It can be performed.
When the camber amount is large, in addition to changing the left and right width reduction amounts, by determining the roll peripheral speed of the left and right vertical rolls in the edger rolling mill and rolling at different peripheral speeds, a large reduction that cannot be corrected only by the width reduction amount. Camber can also be modified.
Next, the hot-rolled material subjected to the edger rolling is horizontally rolled.
By this horizontal rolling, a camber can be corrected by generating a horizontal reaction force in the sheet width direction on the side where the reduction amount of the vertical roll is increased.
[0011]
2 and 3 are diagrams illustrating the principle of the method for correcting camber of a hot-rolled material according to the present invention.
FIG. 2 is a diagram showing a case where a straight rolled material is supplied to an edger rolling mill.
In FIG. 2, a straight rolled material 3 bites into left and right vertical rolls 1 and 2 of an edger rolling mill.
[0012]
In the example of FIG. 2, since the reduction amount (mm) of the left and right vertical rolls is d1> d2, the rolled material 3 receives a horizontal force in the right direction in FIG. The hot-rolled material is bent rightward as shown in FIG.
Further, in the example of FIG. 2, the rotational speed (rpm) of the left and right vertical rolls is V1> V2, and the hot-rolled material receives a rotational force in the right direction of FIG. The hot-rolled material rolled further turns rightward in FIG.
[0013]
FIG. 3 is a diagram illustrating a case where a bent rolled material is supplied to an edger rolling mill.
In FIG. 3, the rolled material 3 bent leftward in FIG. 2 bites into the left and right vertical rolls 1 and 2 of the edger rolling mill.
In the example of FIG. 3, since the reduction amount (mm) of the left and right vertical rolls is d1> d2, the hot-rolled material receives a horizontal force in the right direction of FIG. Since the hot-rolled material thus bent bends rightward in FIG. 2, the camber of the bent rolled material can be reduced.
[0014]
In the example of FIG. 3, the rotational speed (rpm) of the left and right vertical rolls is V1> V2, so that the hot-rolled material receives a rotational force in the rightward direction in FIG. The hot-rolled material rolled in the above manner is further bent rightward in FIG. 2 so that it can be corrected even when the camber is large.
FIG. 4 is a cross-sectional view taken along the line AA ′ of FIG. 3 when the hot-rolled material after the edger rolling is viewed from the downstream side of the rolled material.
[0015]
In FIG. 4, since the reduction amount (mm) of the left and right vertical rolls 1 and 2 is d1> d2, the end portions 5 and 6 are thicker than the central portion 4 of the rolled material. It is a shape called.
In FIG. 4, since the reduction amount d1 of the vertical roll 1 is large, the thickness of the end portion 5 on the vertical roll 1 side is larger than the thickness of the end portion 6 on the vertical roll 2 side.
For this reason, when the uneven thickness is leveled by the subsequent horizontal rolling, the rolled material tends to greatly extend to the side of the vertical roll 1, and due to the reaction force, the rolled material exerts a horizontal force bending rightward in FIG. 4. receive.
[0016]
5 to 7 are views showing an embodiment of a method for correcting camber of a hot-rolled material according to the present invention.
FIG. 5 shows an embodiment in which a horizontal rolling mill 7 is installed at a stage subsequent to the vertical rolls 1 and 2, and is most suitable for a hot strip mill or the like, and can be applied as a part of a rolling path of a mill for performing reverse rolling.
FIG. 6 shows an embodiment in which the vertical rolls 1 and 2 are installed at the subsequent stage of the horizontal rolling mill, and is suitable for a mill that performs reverse rolling.
However, in the case of this embodiment, since the biting failure is likely to occur, it is necessary to set the vertical roll opening larger than the required opening, and to close after the biting.
Further, FIG. 7 is an embodiment in which FIGS. 5 and 6 are combined, and is suitable for a mill that performs reverse rolling.
[0017]
【Example】
Implementation conditions and effects when the method for correcting a camber of a hot-rolled material according to the present invention is applied to an edger rolling mill installed on the entry side of a rough rolling mill of a hot strip mill will be described below.
[0018]
<Implementation conditions>
・ Length of hot-rolled material x thickness: 10m x 200-250mm
・ Camber amount on the side of the edger rolling mill: 20 to 60 mm
-Vertical roll reduction: 7 to 13 mm (one side)
-Peripheral speed difference of vertical roll: 5% or less-Edger roll diameter: 900 to 1400 mmφ
When the edger rolling is performed under the above conditions, the camber of 20 to 30 mm can be corrected by setting the right and left reduction amounts of the vertical roll to different values in the range of 7 to 13 mm.
Furthermore, when the different peripheral speed rolling is also performed, the camber of 60 mm can be corrected.
[0019]
【The invention's effect】
According to the present invention, a camber of a hot-rolled material is corrected by a relatively simple method by changing a reduction amount of right and left vertical rolls in an edger rolling mill to correct a camber of a hot-rolled material. Thus, it is possible to provide a hot-rolled material camber correction method capable of correcting a large camber that cannot be corrected only by conventional different peripheral speed rolling.
[Brief description of the drawings]
FIG. 1 is a diagram showing a flow of a method for correcting camber of a hot-rolled material according to the present invention.
FIG. 2 is a diagram showing a case where a straight rolled material is supplied to an edger rolling mill.
FIG. 3 is a diagram showing a case where a bent rolled material is supplied to an edger rolling mill.
FIG. 4 is a view of the hot-rolled material after the edger rolling as viewed from the downstream side of the rolled material, and is a cross-sectional view taken along line AA ′ of FIG. 3;
FIG. 5 is a diagram showing an embodiment of a method for correcting camber of a hot-rolled material according to the present invention.
FIG. 6 is a diagram showing an embodiment of a method for correcting camber of a hot-rolled material according to the present invention.
FIG. 7 is a diagram showing an embodiment of a method for correcting camber of a hot-rolled material according to the present invention.
[Explanation of symbols]
1: vertical roll (left), 2: vertical roll (right), 3: rolled material,
4: Rolled material center, 5: Rolled material end (left), 6: Rolled material end (right),
7: Horizontal rolling mill

Claims (4)

In the width rolling of the hot-rolled material using an edger rolling machine, by performing horizontal rolling after changing the reduction amount of the left and right vertical rolls in the edger rolling machine, and performing horizontal rolling, the camber of the hot-rolled material is corrected. A method for correcting camber of a hot-rolled material. 2. The method for correcting camber of a hot-rolled material according to claim 1, wherein the peripheral speed of the left and right vertical rolls in the edger rolling mill is changed to perform different peripheral speed rolling. A camber measuring step of measuring the camber of the hot-rolled material on the entry side of the edger rolling mill,
A reduction amount determining step of determining the reduction amount of the left and right vertical rolls in the edger rolling mill based on the measured camber,
An edger rolling step of performing width reduction based on the determined left and right different reduction amounts,
A horizontal rolling step of performing horizontal rolling of the hot rolled material subjected to the edger rolling. The hot-rolling according to claim 3, wherein, in the edger rolling step, the peripheral speeds of the left and right vertical rolls in the edger rolling mill are determined based on the measured camber to perform different peripheral speed rolling. How to correct wood camber.

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