JPS61229409A - Edger rolling mill - Google Patents

Abstract

PURPOSE:To improve the width accuracy and yield of a rolling material by disposing supporting means which permit width adjustment according to the width of the rolling material between vertical rolls. CONSTITUTION:A central roller 3 is provided in the middle between the vertical rolls 1 of an edger rolling mill and side rollers 5 which can be vertically moved by cylinders 4 are disposed on both sides thereof. The vertical rolls 1 are disposed by inclining the rolls at a proper angle to the side opposite from the advancing direction of the rolling material S. The material S receives rolling force and is rolled down in the transverse direction when the material is bitten between the rolls 1; at the same time, the moment to curve the material S so as to project in the transverse direction acts on the material by the component of force of the frictional force between the material S and the rolls 1. The side rollers 5 are raised in this stage via the cylinders 4 to support and restrain the material S. The deformation of the material S is prevented by the above-mentioned method, by which the width accuracy and yield are improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an edger rolling mill that rolls 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. It is related to.

(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 a rolling blade is provided to the rolled material, one side of the rolled material that is in contact with the vertical rolls often lifts up. There is. As a result, it is not possible to perform sufficient width reduction, resulting in a decrease in width dimension accuracy.Furthermore, due to lifting, a step is formed on the side end surface of the rolled material, resulting in a decrease in right-angle dust, which in turn reduces yield. will be invited. In particular, if this one-sided lifting phenomenon occurs during the medium reduction pass, and the lifting direction is different for each pass and appears alternately on the working side and the driving side, the width dimensional accuracy of the rolled material will further decrease and the side end shape will deteriorate. This will encourage These phenomena also appear in the thick plate rolling process or edger rolling in the blooming process.

Furthermore, even if the one-sided lifting does not occur during this edger rolling, if the width reduction amount, which is the rolling amount in the width direction, is too large, the rolled material conveyed on the table roller 2 as shown in FIG. S receives the width reduction blade F by a pair of vertical rolls 1 and is curved upward like S',
In extreme cases, buckling occurs, so the amount of width reduction has been limited. For example, when hot rolling is performed using a continuously cast slab, the width reduction amount during rough rolling is at most 50
The width reduction was limited to about 60 mm, and it was desired to increase the width reduction in order to improve the operating rate of continuous casting equipment.

For this reason, various edger rolling methods have been proposed. As a first method, a tapered roll whose diameter expands upward is used as a vertical roll, or a cylindrical vertical roll is arranged so as to be inclined in the width direction.
No. 16259), there is a method in which a pressing force is generated against the rolled material during rolling to prevent buckling or one-sided lifting. In addition, as a second method, there is a method in which a pressure roll is attached to press the center part of the rolled material. Furthermore, as a third method, rolling using caliber rolls as vertical rolls has been proposed (Japanese Patent Publication No. 7322/1983).

(Problems to be Solved by the Invention) However, in the first method, it is not possible to completely prevent one-sided lifting, and the tapered vertical roll or the inclination in the width direction of the vertical roll causes the rolled material to The perpendicularity of the side end faces will be reduced. In addition, the second
Although the method described above can be expected to be effective in preventing buckling and one-sided lifting, it complicates the rolling equipment and makes maintenance difficult. If the rolled material warps upward, the rolled material will collide with the presser rolls, which will not only cause damage to the equipment but also impede smooth operation.

Furthermore, the third method is originally aimed at significantly reducing the rolled material to reduce the occurrence of biting defects and slipping, and when the thickness of the sheet becomes thinner than the caliber dimension, the phenomenon of one side lifting is prevented. It has drawbacks that cannot be prevented.

In this way, it must be said that the various conventional edge rolling methods are extremely insufficient in solving the buckling phenomenon and one-sided lifting phenomenon, and it is difficult to find a concrete solution. This is the current situation.

The present invention has been made in view of such problems, and an object of the present invention is to provide a nib jar rolling mill that can suppress the buckling phenomenon and the one-sided lifting phenomenon and can perform a large rolling reduction.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a nib jar rolling mill in which a width reduction stand having a pair of vertical rolls rolls a rolled material traveling on a table roller to a required width. , a support means is provided between the vertical rolls, the width of which is adjustable in the width direction of the rolled material, and which supports the rolled material.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 8.

In FIGS. 1 and 2, 2 is a vertical roll, and 2 is a table roller that conveys the rolled material S. A central roller 3 is disposed between the vertical rolls 1, and side rollers 5 that can be raised and lowered by cylinders 4 are arranged on both sides of the central roller 3.
It supports the rolled material S during width reduction.

FIGS. 3 and 4 schematically show the principle of the edger rolling method in which width reduction of the rolled material S is performed using this edger rolling machine. In advance, a pair of vertical rolls l having smooth surfaces are placed in a vertical plane parallel to the traveling direction of the rolled material S (from left to right in FIG. ) at an appropriate angle θ0 with respect to the vertical line. When the rolled material S is bitten by the vertical roll 1 in this inclined state, the rolled material S is rolled down in the width direction by receiving the rolling blade F of the vertical roll 1.

At this time, an upward component [1'' 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 rolled material S is affected by the force fR and A moment acts on the rolled material S to convexly curve it downward in the width direction due to the resultant force with the rolling blade F. The rolled material S tries to curve and deform convexly downward, but since it is supported by the central roller 3, the curved deformation does not occur. is restrained to a certain extent and does not develop further. As a result, the rolled material S can be reduced in width by a large amount without buckling.

However, as shown in FIG. 5, when the width of the rolled material S is considerably wider than the center roller 3, buckling occurs in the part that is not in contact with the center roller 3, and the center part rises, and the rolled material S Transforms into a W shape. Then, when it is further rolled down, the rolled material S is curved upwardly over its entire width.

Therefore, in such a case, the side roller 5 is moved to the cylinder 4.
The support range of the rolled material S is expanded by avoiding the rising of the rolled material S.
deformation is restrained over almost the entire width. As a result, even if the number of rolling blades is increased, the rolled material S is not deformed into a W shape, so that buckling does not occur and wide rolling is possible.

Next, other embodiments of the present invention will be described.

FIG. 7 shows a second embodiment of the support means disposed between the vertical rolls 1, in which four table rollers 6 shorter than the table roller 2 are used. Two sets of table rollers 6 that are not adjacent to each other are synchronously moved horizontally in opposite directions by cylinders 7.

Therefore, by horizontally moving the table roller 6 to adjust the width according to the width of the rolled material S, the W-shaped deformation of the rolled material S can be prevented, as in the embodiment described above.

FIG. 8 shows a third embodiment of the support means arranged between the vertical rolls 1. In this embodiment, the support means is formed by a central table 8 located in the center between the vertical rolls 1 and side tables 9 located on both sides of the central table 8, and the side tables 9 are arranged in the width direction of the rolled material S by a cylinder lO. It is supposed to move.

Therefore, as in the first and second embodiments, by moving the side table 9 and adjusting the width according to the width of the rolled material S, W-shaped deformation is prevented and a large reduction is possible. .

In this third embodiment, as shown by the double-dashed line in FIG.
The center table 8 and the side tables 9 may be table rollers.

In addition, the present invention not only prevents W-shaped deformation and enables a large reduction, but also when the rolled material is a nose-down material (rolled material whose tip is turned downward), This can prevent you from getting caught. In other words, conventionally, in order to ensure movement of the vertical rolls in the rolling direction, table rollers were not placed between the vertical rolls, and the tip of the rolled material that had left the entry table roller was cantilevered. There have been cases where the sheet warps and gets caught on the exit table roller 14 and is not conveyed, but according to the edger rolling mill equipped with the support means according to the present invention, such an interlayer does not occur.

Further, by forming the shape of the plane in which the support means of the edger rolling mill according to the present invention comes into contact with the rolled material so that it becomes lower toward the center from both sides (vertical roll side) of the support means, a stronger reduction can be achieved. It becomes possible to do so.

For example, in the third embodiment shown in FIG. 9, when the upper surface of the side table 9 is inclined downward toward the center table 8, the rolled material is supported by these and curved downward. Therefore, during width reduction, the rolled material maintains its downwardly curved state and is restrained from deformation by receiving reaction forces from the center table 8 and side tables 9. As a result, even if the number of rolling blades is increased, the rolled material will not become flat, buckling will not occur, and a large rolling reduction will be possible.

Alternatively, in the second embodiment shown in FIG. 7, by inclining the table rollers 6 in opposite directions alternately, the shape of the plane in contact with the rolled material can be made lower toward the center, and the effect is Same as above.

Furthermore, in the first embodiment shown in FIG. 1, the side rollers 5 are tapered linearly or curved toward the center roller 3, or the center roller 3 is formed to be tapered at the center. The same effect as described above can be achieved.

In the above embodiments, as a method for causing downward curving deformation in the rolled material, a pair of vertical rolls is tilted in a vertical plane parallel to the traveling direction of the rolled material so that its upper part faces in the opposite direction to the traveling direction. Although we adopted the method of biting the rolled material in a state where

One method is to process the rolled material in advance so that the width of both lower side edges is smaller than the upper side edge, and then roll it, which causes the rolled material to be deformed to curve downward. It is something that makes you

The other method is to cause the rolled material to undergo downward curving deformation by biting the rolled material in a state where the downward curving deformation is formed before width reduction.

First, an example of the former method will be described.

Before the width adjustment rolling, the tip of the rolled material S is formed into a chamfer shape using a forming device such as a press device so that the width of the lower side edge portions is smaller than the upper side edge portion (10th step). figure).

When the rolled material S having such a chamfered portion C is subjected to width adjustment rolling with a pair of left and right vertical rolls l, as shown in FIG. At this stage, the material flow state changes, and the formation of the dog bone (■) at the upper part becomes larger than the dog bone (■) at the bottom. Load f
Since the relationship between I and r is f, that is, the load on the side where the chamfer portion C is provided is smaller, the difference acts on the rolled material S as a deterrent force. As a result of this restraining force acting as a force that presses the rolled material S against the conveyance roller table, lifting of one side of the rolled material S is suppressed.

On the other hand, when the rolled material S is width-reduced, the upper side of the tip portion is rolled down, so that it curves convexly downward in the width direction of the rolled material S. The curved rolled material S is supported by the central roller 3, and the progress of the curved deformation is suppressed by the reaction force of the central roller 3. According to this method, it is possible to avoid the phenomenon that the rolled material S curves convexly downward in the width direction during width reduction and develops into buckling (first
f figure).

Next, an example of the latter method will be described.

As shown in FIGS. 12 and 13, before rolling, both ends of the tip of the rolled material S are placed in a hydraulic cylinder 11, a piston 12, a press die 13. A press molding device including a support table 14 is used to process the cross-sectional shape in the width direction so that it curves convexly downward.

The rolled material S curved and deformed in this way is rolled into a pair of vertical rolls 1.
When the rolling load F is applied in the width direction between the fourteenth
As shown in the figure, the displacement between the point of application of the rolling load F on the end face of the rolled material S and the center of the rolled material S on the central roller 3 supporting the rolled material S, that is, the irregular amount δ, is will occur. Therefore, when a rolling load F in the width direction is applied to the rolled material S, the rolled material S receives a bending moment due to the presence of the irregular amount δ, causing further downward curving deformation. At this time, since the central portion of the lower surface of the rolled material S is supported by the central roller 3, the expansion of the deformation is regulated and a restrained state is established, so that the deformation does not increase any further. Therefore, the rolled material S is rolled down in the width direction without excessive deformation or even buckling, and it becomes possible to apply a large width reduction.

Furthermore, other embodiments of the latter method will be described.

In FIG. 15, the vertical roll 15 has a flange 16 continuous and integrally formed with an inclined part 17 on the lower side thereof, and the lower end of the inclined part 17 is at the same level as the pass line of the rolled material S or not. It is located further down.

When rolling down the rolled material S in the width direction using the pair of vertical rolls I5, the lower edges of both side ends of the rolled material S first collide with the inclined portion 17, and the vertical component of the collision force at this time is In other words, as a result of a force that tends to bend the lower edges of both sides of the rolled material S upward, both ends of the rolled material S are lifted up to the small diameter end of the inclined portion 17, and are convex downward as shown as S' in the figure. A gentle curved deformation will occur.

Alternatively, if the ratio of the width to the thickness of the rolled material is small, the entire rolled material will be lifted from the table roller 2, and the rolled material will be free to deflect due to its own weight.

Next, when the rolled material that has been curved and deformed downward is rolled down in width, the deformation tends to further increase, but the rolled material S' is already supported at its center by the central roller 3 or will soon be supported. As a result, the expansion of the deformation is regulated and a restrained 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 description, according to the present invention, a support means whose width can be adjusted in the width direction of the rolled material is provided between a pair of vertical rolls, and the width is adjusted according to the width of the rolled material. By supporting the rolled material during width reduction, the buckling limit width reduction amount is significantly increased.

The amount of width reduction, which was conventionally about half of the plate thickness, has been significantly increased, and it has become possible to perform stable edge rolling and improve the width accuracy of rolled materials.
This has the effect of improving product yield.

[Brief explanation of drawings]

FIG. 1 is a plan view of an edger rolling mill according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a side view showing a rolling state by a method of rolling with vertical rolls inclined. FIG. 4 is a front view of FIG. 3, FIG. 5 is a front view showing a state in which the rolled material undergoes W-shaped deformation during rolling, and FIG. 6 is a support for the edger rolling mill according to the present invention. A front view showing the operating state of the stand;
FIG. 7 is a plan view showing the second embodiment of the edger rolling mill according to the present invention, FIG. 8 is a plan view showing the third embodiment, and FIG. 9 is the [-[ A line sectional view, FIG. 1O, and FIG. 11 are front views showing the rolling state by a method in which both ends are chamfered in advance and rolled, and FIG. 12 is a forming device for the tip of the rolled material and its forming process. FIG. 13 is a front view of FIG. 2, FIG. 14 is a front view of the rolled state obtained by bending and rolling in advance, and FIG. 15 is a plan view of the flanged vertical roll. FIG. 16 is a front view showing the rolling state by the conventional edger rolling method. L... Vertical roll, 2... Table roller, S...
Rolled material, 3... Central roller, 4... Cylinder, 5...
...Side roller, 6...Table roller, 7...
Cylinder,...Central table, 9...Side table, 10...Cylinder. Figure 4 5th country 6rg 7B! l Figure 10 Figure 12 Figure 13 Cause

Claims (1)

[Claims] (1) In an edger rolling mill that rolls a rolled material traveling on a table roller to a required width using a width reduction stand having a pair of vertical rolls, the width can be adjusted in the width direction of the rolled material between the vertical rolls, and An edger rolling mill characterized in that it is provided with a support means for supporting a rolled material.