JPS6096303A - Edging method of sheet material - Google Patents

Abstract

PURPOSE:To increase the extent of rolling reduction in the width direction and to improve the accuracy of width dimensions of a product by forming calibers in vertical rolls and bend-deforming downward a rolling material by calibered side walls while sustaining the deformation by a table roll. CONSTITUTION:Calibers 11 are formed in the surface of a pair of vertical rolls 10, and each caliber 11 is formed into an opening having side walls 12 slanted downward. At the time of edging, each side-end part of a rolling material S is provided with a load which tends to bent said part upward by the walls 12 of the calibers 11, and the material S is deformed into a curve projecting gently downward as a whole. The produced curvature is reactionally sustained by a table roll 13. In this way, the curved deformation of material S is positively controlled, and the material S is subjected to rolling reduction in its width direction as a material S' in a restricted state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of edger rolling a plate.

Conventionally, plate materials of various widths are manufactured in plate mills, hot strip rolling, etc., but in order to obtain the desired product width, during manufacturing, various processes such as blooming rolling, rough rolling in plate and hot strip rolling, etc. Width adjustment rolling,
That is, F-jer rolling is performed. In recent years, from the viewpoint of focusing on economic efficiency, the continuous casting ratio has not been high, so it is recommended to omit the blooming process by using these continuous casting slabs. However, hot strip rolling is recommended. In this case, when width adjustment reduction is performed during rough rolling, the rolled material S undergoes upward curve deformation when it receives the rolling blades F from the pair of vertical rolls 1, as shown in FIG. This occurs because only the edges of the rolled material are rolled down, and the deformation is not uniform in the width direction of the rolled material S. Also, if the above-mentioned upward curvature occurs extremely, the rolled material S may buckle due to the so-called buckling phenomenon. This makes width adjustment reduction impossible, and conventionally, the width adjustment reduction in rough rolling of hot strip rolling has been about 50 to 60 mm at most. In order to manufacture slabs, we prepare molds with various width dimensions according to the product dimensions, taking into account the amount of width adjustment reduction mentioned above, and if the molds are changed frequently to manufacture slabs, the operating rate of continuous casting equipment will be reduced. It will be forced. Furthermore, a method for changing the width dimension during continuous casting has been proposed, but this results in a decrease in yield due to an increase in the amount of cut-off of irregular portions at the width change position. Therefore, if an edge rolling method that allows for a large width reduction becomes possible, the width adjustment reduction can be sufficiently achieved in the rough rolling row. It becomes possible to improve the operation rate of continuous casting equipment by reducing the preparation time of the mold pattern due to the change of width dimensions, and it also becomes possible to improve the yield.

For this reason, various types of F-jer rolling methods have been proposed in the past. For example, as a typical F-jer rolling method, a tapered roll whose diameter expands upward is used as a vertical roll, or a cylindrical vertical roll is used. JP-A No. 53-116
[Patent No. 259] There is a method that generates a presser foot against the rolled material during rolling to prevent buckling, but when the amount of rolling becomes large, the taper or inclination presses both side edges of the rolled material downward. Regarding υ buckling, which tends to encourage buckling, it will actually have a negative effect.

Moreover, the surface angle of the side end surface of the rolled material often decreases due to the taper of the vertical roll or the inclination of the vertical roll in the width direction.

In addition, a device with a presser roll that presses the center of the rolled material has been proposed, but although it can be assumed to be effective in preventing buckling, the rolling equipment is complicated and maintenance is difficult. If the rolled material is warped, the rolled material will collide with the presser roll, not only causing damage to the equipment but also interfering with smooth operations. Furthermore, it has been proposed to roll using caliber rolls as vertical rolls (Japanese Patent Publication No. 7322/1983).1 In this method, buckling is used to restrain the edges of the rolled material by the caliber. However, when performing a large width reduction or when performing width reduction on a rolled material with a large ratio of thickness to width (width dimension/thickness dimension), Since there is no presser roll as described above to restrain the rolled material, it is not possible to suppress the buckling phenomenon, and at present no effective solution has been found in any of the methods.

The present invention has been made in view of the above-mentioned points, and is characterized by a method of rolling a plate material to a required width dimension using a width reduction stand having a pair of vertical rolls. - Using a roll in which a caliber is formed on the roll, when the rolled material is width-rolled, the caliber side wall of the vertical roll applies a load to the side edge of the rolled material to deform the part upward, and The present invention consists in that the width reduction is carried out while the pressure is supported by the table roller.

Hereinafter, the edger rolling method according to the present invention will be explained based on the illustrated embodiment.A caliber 11 is cut into each of a pair of vertical rolls 1o that applies a width reduction to a rolled material S. As an example of the caliber 11 in the vertical roll 10 is shown in FIG. 3, the side wall 12 formed with the caliber 11 is formed as an opening inclined downward at an appropriate angle θ. When the rolled material S is rolled in the width direction using the pair of vertical rolls 1°, the side edges of the rolled material 8 are formed by the vertical rolls 1 because the caliber 11 is formed to be inclined downward. Due to the rolling force accompanying the rolling reduction of °, the side wall 12 of the caliber 11 applies a load that tends to bend the side edge portion of the rolled material S upward, and as a result, the rolled material S is Middle S
A gentle curved deformation occurs in the entire body as shown by ′, but this curve is caused by the reaction force caused by the table roller 13 disposed between the vertical rolls 10 as a vertical edger. By actively controlling the bending deformation in the rolled material S by supporting it)
The rolled material 8' is brought into a restrained state, and the rolled material is rolled down in the width direction.

As will be understood from now on, the shape of the caliber 11 in the pair of vertical rolls 10 is such that the shape of the caliber 11 in the pair of vertical rolls 10 is such that the rolled material S
The rolling material S relative to the vertical roll 10 has a large specific gravity due to the upward curve deformation with respect to the side edge of the
When considering the biting property of the caliber 11, for example, as shown in FIG. It is also effective to reduce θ, or to form a chamfer 14 on the upper side wall 12' as shown in (C).

FIG. 4 shows the experimental results of the relationship between the inclination angle θ of the caliber 10 and the critical reduction amount until buckling occurs in the rolled material in the edger rolling method according to the present invention.

As is clear from this, it is understood that the present invention has an extremely superior effect on width reduction compared to the case where smooth vertical rolls are used.

In the above description, an integrally molded roll was explained as a vertical roll, but the effect can be further enhanced by applying a variable caliber type edger roll whose caliber width can be changed.

As is clear from the above description, according to the present invention, a vertical roll having a caliber is used, the deformation of the rolled material is actively controlled as a downwardly convex curved deformation by the side wall of the caliber, and this deformation is controlled by the table roller. By supporting the reaction force, the rolled material is restrained and the width reduction can be made large, which improves the width dimension accuracy of the product. This makes it possible to consolidate the dimensions of slabs in the equipment, and the effects of this, such as improving the productivity of the equipment, are extremely large.

[Brief explanation of the drawing]

FIG. 1 is an explanatory drawing showing the state of conventional edger rolling, and FIG. 2 is a schematic illustration showing the edger rolling method of the present invention.
FIG. 3 is an explanatory diagram showing an example of the caliber shape in a vertical roll, and FIG. 4 is a quotient showing the experimental results showing the influence on the rolling reduction amount. In the figure, 10 is a vertical roll, 11 is a caliber 12 is a side wall. Patent applicant Kobe M@ Co., Ltd. Patent attorney Yoshiyuki Kaji 1 Figure JP-A-Sho GO-96303 (4)

Claims (1)

[Claims] In a method for rolling a plate material in which a rolled material is rolled to a required width dimension by a width reduction stand having a pair of vertical rolls, a roll having a caliber formed on the vertical roll is used, and when the width reduction of the rolled material is performed, the vertical roll is rolled. Edger rolling of a plate material characterized by applying a load to the side edge of the rolled material to deform it upward by the caliber side wall of the roll, and performing width reduction while supporting pressure on the rolled material by a table keeler. Method.