JPS62173007A - Edger rolling method - Google Patents

Abstract

PURPOSE:To suppress the generation of buckling and to permit large cross reduction by pressing the central part on the top surface of a rolling material to level the upward deformation, biting the rolling material with vertical rolls and supporting the central part on the bottom surface of the rolling material with a table. CONSTITUTION:The central part on the top surface of the rolling material S is pressed downward by a press roll 5 by which said part is flattened or curved downward and leveled prior to cross reduction. The material S is subjected to the cross reduction while such state is maintained, then both side ends of the material S are lifted or curved to project downward by sloped parts 6 of the vertical rolls 1 and the large cross reduction is executed while the expansion of the deformation by a table 3 is controlled.

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. 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 V7-tire scale breaker (
VSB) Alternatively, when width adjustment rolling is performed using a pair of cylindrical vertical rolls as an edger, if the width reduction amount, which is the rolling amount in the width direction, is too large, the table roller The rolled material S conveyed above 2 is subjected to the width reduction blades F by the pair of vertical rolls 1 and is deformed into an upward curve 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 necessary to increase the amount of width reduction in order to improve the operating rate of continuous casting equipment. It was wanted.

For this reason, it has conventionally been proposed to attach a presser roll to press the central portion of the rolled material. For example, Japanese Patent Publication No. 47-36144, Japanese Patent Application Publication No. 55-1671.
9, JP-A-55-6023, JP-A-58-
This is shown in JP-A No. 61999 and the like. All of these have a structure in which the rolled material is held down 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, the pressing force is very large because the rolled material (indicated by S in FIG. 2) that is curved in the width direction is pressed down by width reduction. . Therefore,
The structure of the pressure roll is complicated and strong, and it is difficult to install the vertical roll in the stand.
Moreover, since the rolled material is held down by press rolls from above and below,
Moreover, the structure becomes more complicated.

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

The present invention has been made in view of such 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 is rolled to a required width using a width reduction stand having a pair of vertical rolls. While pressing the center part to correct the deformation of curving upward in the width direction, slightly lifting both ends of the rolled material to cause deformation, the rolled material is bitten by the vertical rolls,
The central part of the lower surface of the rolled material is supported by a table provided between vertical rolls, and rolling is performed while restricting the expansion of deformation due to width reduction.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a pair of vertical rolls that roll the rolled material S in the width direction while conveying it on table rollers 2.Below between the vertical rolls 1 is a table 3 that supports the center part of the lower surface of the rolled material S. Further, above it, a presser roll 5 for pressing the center part of the upper surface of the rolled material S with a shilling 4 is provided.
is provided. The vertical roll 1 has an inclined part 6 on its lower side.
7 langes 7 are formed, and are arranged so that the pass line of the rolled material S is located between the upper end and the lower end of the inclined portion 6.

When rolling the rolled material S in the width direction using this pair of vertical rolls 1, the lower edges of both side ends of the rolled material S receive rolling force from the inclined portions 6, and therefore are perpendicular to the inclined surface of this rolling force. As a result of the force generated in the direction, that is, the force that tends to bend the lower edges of both ends of the rolled material S obliquely upward, the both ends of the rolled material S are lifted up to the upper end of the inclined portion 6, and as a result, the both ends of the rolled material S are lifted up to the upper end of the inclined portion 6, and the lower edges of the rolled material S are As shown, a gentle curved deformation occurs in a downwardly convex manner.

Alternatively, in the case of a rolled material in which the ratio of the width dimension to the thickness of the rolled material is small, the entire rolled material is lifted from the table 3,
The rolled material will undergo free deflection due to its own weight.

Next, when the rolled material S', which has been curved and deformed downward, is reduced in width, the deformation tends to further increase, but the rolled material S' is either already supported at the center of its lower surface by the table 3, or Since it is eventually supported, the expansion of 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.

However, before the rolled material S enters the width reduction stand, there are cases where it is already greatly curved in the width direction into a "bi-convex" shape due to the influence of the heating furnace (FIG. 3). In such a case, even if the vertical roll 1 as described above is used, it may be sufficient to completely prevent the occurrence of buckling.

Therefore, as shown in FIG. 1, before the width reduction, the center part of the upper surface of the rolled material S is pressed downward by the presser roll 5 to make it flat or curved downward to correct it. Then, when width reduction is performed while maintaining this state, the rolled material S is lifted at both ends by the inclined portions 6 of the vertical rolls 1, curved further downward, and deformed by the table 3. While the expansion of the economy is being regulated, there is a significant reduction in pressure.

In this way, the rolled material S is curved upward in the width direction.
Even when the material enters the width reduction stand and is removed from the width reduction stand, significant rolling is possible without buckling.

In the above example, as a method for slightly lifting both ends of the rolled material, a method was used in which both ends of the rolled material were placed on the inclined portions formed on the vertical rolls.
As shown in the figure, by keeping the table 3 smooth and protruding slightly above the pass line by providing protrusions on both sides of the table 3, the ends of both sides are gradually moved toward the protrusions before the rolled material is bitten by the vertical rolls. It may also be made to ride on the vehicle. Alternatively, the table 3 may be closed with a drum-shaped table roller whose diameter is tapered from both ends toward the center.

(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, is significantly increased, and the rolled material is Even if the material is convexly curved, stable edge rolling is possible, and it is also possible to improve the width accuracy of the rolled material 1), which improves the yield of the product. In addition, the pressing force applied to the center of the upper surface of the rolled material, for example, by a presser roll, is sufficient to curve the rolled material downward in the width direction, and only one presser roll is required. The pressure roll has a simple structure and 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 drawings]

Fig. 1 is a front view showing the rolling state by an edger rolling mill applying the method according to the present invention, Fig. 2 is a front view showing the rolling state by the conventional edger rolling method, and Fig. 3 is a top view in the width direction. FIG. 2 is a perspective view showing a rolled material curved in a convex manner. 1... Vertical roll, 2... Table roller, S...
Rolled material, 3...Table, 4...Cylinder, 5...
・Press roll, 6... inclined part, 7... 7 lunge.

Claims (2)

[Claims] (1) In an edger rolling method in which a rolled material is rolled to a required width using a width reduction stand having a pair of vertical rolls,
Press the center of the upper surface of the rolled material to correct the deformation of curving upward in the width direction, while slightly lifting both ends of the rolled material to cause deformation, and then bite the rolled material into the vertical rolls. In addition, an edger rolling method characterized in that rolling is carried out while controlling the expansion of deformation due to width reduction by supporting the central part of the lower surface of the rolled material by a table provided between vertical rolls. (2) An enlarged diameter flange having an inclined part is formed at the lower part of the pair of vertical rolls, and both ends of the rolled material are bitten into this inclined part, so that both ends are slightly raised. An edger rolling method according to claim 1.