JPS6234601A - Edger rolling method - Google Patents

Abstract

PURPOSE:To subject to a thick plate, etc. to large cross rolling reduction without bucking a rolling material in the state of cross-rolling the thick plate, etc. with vertical rolls by including the axies of the vertical rolls in the direction opposite from the direction where the rolling material advances and pressing the rolling materialw ith a press roll from above. CONSTITUTION:While the rolling material S is conveyed on a table roller 2, the rolling force is exerted to the a material in the transverse direction with a pair of the vertical rolls 1, 1 and the material is thus cross-rolled in the stage of rolling the thick plate, etc.in the transverse direction thereof. The vertical rolls are inclined by an angle theta in the direction opposite from the direction (arrow) where the material S advances in this case; at the same time, the upper part of the material S is pressed with the press roller 3 by a cylinder 4. The material S is rolled down in the transverse direction by the rolling force F of the vertical rolls 1. The upward curving of the material S by the cross rolling force is suppressed by the press roller 3 and the tendency to downward curving by the resultant force of the cross rolling force F and the component of force fR by the friction between the vertical rolls and rolling material is supported by the table roller 2. The material is thus cross-rolled without bucking.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an edger rolling method for rolling a rolled material from the width direction in a thick plate rolling process, a rough rolling process of hot strip rolling, or a blooming process. This is about B.

(Prior art) For example, in the rough rolling step in hot strip rolling, the rolled material is rolled to a thickness that can be rolled in a subsequent continuous finishing mill, and then width adjustment rolling is performed to obtain a predetermined product width. will be held. In this width adjustment rolling, that is, edger rolling, a vertical scale breaker (
VSB) Alternatively, when width adjustment rolling is performed using a pair of cylindrical vertical rolls as edgers, if the width reduction amount, which is the rolling amount in the width direction, is too large, as shown in FIG. The rolled material S conveyed above is subjected to the width reduction blade F by the pair of vertical rolls 1, and is curved upward as shown by S', and in extreme cases, a buckling phenomenon occurs.
The amount of width reduction was limited.

For example, in the case of hot rolling using a continuous casting slab, the amount of width reduction during rough rolling is limited to about 50 to 60 mm at most, and it is desirable to increase the amount of width reduction in order to improve the operating rate of continuous casting equipment. It was rare.

For this reason, it has been proposed to attach a presser roll that presses the center of the rolled material.

For example, Japanese Patent Publication No. 47-36144, Japanese Patent Publication No. 55-16
No. 719, JP-A-55-6023, JP-A-58-61
This is shown in Publication No. 999 and the like. All of these have a structure in which the rolled material is pressed by rolls from above and below in order to suppress buckling due to vertical curvature during width reduction.

(Problems to be Solved by the Invention) However, in the conventional method, since the rolled material (indicated by S in FIG. 8) that is curved in the width direction is held down by width reduction, the holding force becomes very large. . Therefore, the structure of the presser roll becomes complicated and strong, making it difficult to install the vertical roll in the stand, and furthermore, since the rolled material is pressed by the presser roll from above and below, the structure becomes even more complicated.

As described above, it must be said that the conventional edger rolling method is extremely insufficient for avoiding the buckling phenomenon, and at present no concrete solution has been found.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an edger rolling method that suppresses the occurrence of the buckling phenomenon and allows a large reduction.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an edger rolling method in which a rolled material that advances on a table roller is rolled to a required width by a width reduction stand having a pair of vertical rolls. In this step, the center part of the upper surface of the rolled material is pressed from above to cause the rolled material to curve downward in the width direction, and the vertical roll is moved in a vertical plane parallel to the traveling direction of the rolled material. Then, width reduction is performed with the upper part of the rolled material tilted in the opposite direction to the direction of movement, and the central part of the rolled material is supported by table rollers to prevent expansion of deformation due to width reduction while rolling is carried out. It is something to do.

(Example) Next, in FIGS. 3 and 4, which explain an example of the present invention according to the drawings, a pair of vertical rolls l having smooth surfaces are moved in advance in the traveling direction of the rolled material S (see FIG. 3). , it is tilted at an appropriate angle θ0 with respect to the vertical line so that its upper part faces in the direction opposite to the advancing direction (toward the entrance side of the rolled material) in a vertical plane parallel to the left to right direction. When the rolled material S is bitten by the vertical roll l in this inclined state, as shown in FIG.
The rolled material S is rolled down in the width direction by the rolling blade F of the vertical roll 1. At this time, an upward component R of the frictional force r generated between the vertical roll l and the rolled material S acts on the end of the rolled material S. Therefore, the force fR and the rolling blade F are applied to the rolled material S.
The resultant force acts on the rolled material S to convexly curve it downward in the width direction. The rolled material S tries to curve and deform in a downward convex manner, but since it is supported by the table roller 2, the curved deformation is restrained to a certain extent and does not progress any further. As a result, the rolled material S can be reduced in width to a large extent without buckling.

Before the rolled material S enters the width reduction stand, it may already be greatly curved upward in the width direction due to the influence of the heating furnace (FIG. 5). In such a case, even if the vertical roll 1 is tilted, it may not be possible to completely prevent buckling from occurring.

Therefore, as shown in FIGS. 1 and 2, a presser roll 3 is provided above the rolled material S so as to be movable in the vertical direction by a cylinder 4, and a table roller 2 facing the presser roll 3 is placed at both ends of the presser roll 3. It is formed so that the diameter becomes narrower toward the center.

Then, by pressing the center part of the upper surface of the rolled material S downward with the presser roll 3, width reduction is performed while the rolled material S is maintained in a downwardly curved state.

As a result, even if the rolled material S curved upward in the width direction enters the width reduction stand, buckling will not occur.
1. It is possible to roll a large amount of material without the occurrence of 1.

The present inventors conducted a model experiment of the present invention using hot steel under the following conditions, and measured the presser roll pressure with a pressure gauge.

Vertical roll diameter 100mmφ Vertical roll surface Knurling rolled material size
Board thickness: 9mm, board width: 200mm.

Plate length 500mm Reduction amount 15mm Vertical roll inclination angle Oo, 5° inclination on the entry side Rolled material Continuous casting killed adjustment rolling temperature 880℃ Rolling speed 20 m/Iain Table barrel length 150mm Presser roll diameter 50IIIOI barrel 50
mm As a result, as shown in Figure 6, the inclination angle of the vertical roll O
In the case of a conventional vertical vertical roll, the rolled material S curved upward convexly in the width direction and buckled, but a pressure of nearly 1 ton from the presser roll was required to suppress it. On the other hand, when the method according to the present invention was applied and the vertical roll was tilted 5 degrees toward the entrance side, the pressure on the presser roll was reduced to 0.1 ton or less, which was significantly reduced.

FIG. 7 shows another embodiment of the present invention, which is substantially the same as the embodiment described above except for the use of a vertical roll 5 with an enlarged diameter at the bottom, and corresponding parts are given the same numbers. The explanation will be omitted. That is, the vertical roll 5 has a flange 6 continuous and integrally formed with an inclined part 7 on the lower side thereof, and the lower end of the inclined part 7 is at the same level as the pass line of the rolled material S or below it. It is now located in

When the rolled material S is bitten by the pair of vertical rolls 5, the lower edges of both side ends of the rolled material S first collide with the inclined portion 7, and the vertical component of the collision force at this time causes both sides of the rolled material S to be bitten. The end is lifted up to the small diameter end of the inclined portion 7. Then, with both ends of the rolled material S raised, presser roll 3
When the central part of the rolled material S is pressed downward, the rolled material S
As shown by S° in the figure, a gentle curved deformation convexly occurs downward.

Next, when the rolled material that has been curved and deformed downward is rolled down in width, the deformation tends to further increase, but since the central part of the rolled material S° is already supported by the table rollers 2, the deformation is reduced. Expansion is regulated and a restraint state is established, so that the deflection does not increase any further.

Therefore, rolling down in the width direction is performed while buckling is prevented.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, the amount of width reduction, which was conventionally about half of the plate thickness, has been significantly increased, and stable edger rolling has become possible. At the same time, it becomes possible to improve the width accuracy of the rolled material, and the yield of the product improves.

In addition, as for pressing the center part of the upper surface of the rolled material, for example, using a presser roll, it is sufficient to bend the rolled material downward in the width direction, and the presser roll only needs to be applied in the upper direction. The roll has a simple structure, is small, and has the advantage that it can be easily installed not only on the entrance side of the width reduction stand but also between the width reduction stands.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the state of rolling by an edger rolling mill applying the method according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 shows the state of rolling by an inclined edger rolling mill. 4 is a front view of FIG. 3, FIG. 5 is a diagram showing a rolled material curved upward in the width direction, and FIG. 6 is an experiment to confirm the effect of the method according to the present invention. 7 is a front view showing another embodiment of the method according to the present invention, and FIG. 8 is a front view showing the rolling state by the conventional edger rolling method. 1... Vertical roll, 2... Table roller, S...
Rolled material, 3... Presser roll, 4... Cylinder. Special Fraud Applicant Kobe Steel Co., Ltd. Representative Patent Attorney Mr. Aoba and 2 others Figure 1, Figure 2, Number 3! I j 114 Figure 511 Figure 6 Hard roll height htL θ(0) Figure 7rM Figure 8

Claims (1)

[Claims] (1) In an edger rolling method in which a rolled material traveling on a table roller is rolled to a required width by a width reduction stand having a pair of vertical rolls, the center part of the upper surface of the rolled material is pressed from above to give the rolled material a width The pair of vertical rolls is tilted in a vertical plane parallel to the direction of movement of the rolled material so that its upper part faces in the opposite direction to the direction of movement of the rolled material. An edger rolling method characterized in that rolling is carried out while the central part of the rolled material is supported by table rollers and expansion of deformation due to width reduction is controlled.