JPS6076203A - Edger rolling method of sheet material - Google Patents

Abstract

PURPOSE:To improve width accruracy and product yield by performing edger rolling by slanting vertical rolls to the direction, reverse to the advancing direction of a rolling material, in the vertical plane parallel to the advancing direction of the material. CONSTITUTION:A pair of vertical rolls 1 having smooth surfaces are previously slanted to the direction reverse to the advancing direction of a rolling material S by a proper angle theta deg., and the material S is bitten by the slanted rolls 1. The rolling material S bitten by the rolls 1 is subjected to rolling reduction in the width direction under the rolling load of rolls 1, to produce deformation curved downward. The deformation of material S is counter held by a table rolls 2 disposed between the rolls 1, and the edging is performed while balancing a bending moment, produced in the material S at the time of edging, by the roll 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rolling a plate material.

BACKGROUND ART Conventionally, plates of various widths are manufactured in plate mills, hot strip rolling, etc., and during manufacturing, width adjustment rolling, ie, edge rolling, is performed to obtain the desired product width. In recent years, the continuous casting ratio has become high due to the emphasis on economic efficiency. For example, when performing hot strip rolling using a continuously cast slab, if width adjustment reduction is performed during rough rolling, the first As shown in the figure, when the rolled material S is subjected to the rolling blade F by the pair of vertical rolls 1, the rolled material S undergoes upward curving deformation, only the edge of the rolled material is rolled down, and the deformation occurs in the rolled material S. If the roll is not carried out uniformly in the width direction, and if the above-mentioned upward curvature occurs excessively, the buckling phenomenon of the rolled material S called buckling will make width adjustment reduction impossible. The width adjustment reduction in is at most 50
The diameter of the continuous casting slab is approximately 6 Qmm, and as a result, continuous casting slabs with various mold sizes are prepared according to product dimensions, and the operating rate of the continuous casting equipment is reduced in order to manufacture the slabs. 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. This makes it possible to improve the operating rate of continuous casting equipment by reducing the preparation time for mold patterns associated with width dimension changes.

For this reason, various edger rolling methods have been proposed in the past. For example, as a typical edger rolling method, a tapered roll whose diameter expands upward is used as a vertical roll, or a cylindrical vertical roll is used. Japanese Patent Laid-Open No. 53/1983, in which the rolls are arranged so as to be inclined in the width direction. (Japanese Patent Publication No. 116259) There are methods to prevent buckling by generating a pressing force against the rolled material during rolling, but this may actually have a negative effect on buckling.

Further, the perpendicularity of the side end surfaces of the rolled material is reduced due to the taber 1 of the vertical roll or the inclination in the width direction of the vertical roll.

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 (% 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), At present, the buckling phenomenon cannot be suppressed, and no effective solution can be found in any of the methods.

The present invention has been made in view of the above-mentioned points, and is characterized by an edger rolling method for plate materials in which a rolled material is rolled to a required width using a width reduction stand having a pair of vertical rolls. The vertical roll of the rolled material is tilted in the opposite direction to the traveling direction of the rolled material in a vertical plane parallel to the traveling direction of the rolled material, and the rolled material is bitten, and width reduction is applied to cause the rolled material to curve downward. The deformation of the rolled material is supported by the reaction force on table rollers disposed between the rolls, and the bending moment generated in the rolled material during width reduction is balanced by the table rollers while width reduction is performed. It consists in doing the following.

The following will explain the embodiments shown in the drawings. FIGS. 2 to 4 schematically show the principle of the edger rolling method according to the present invention, in which a pair of vertical rolls 1 having a smooth surface are In advance, the rolled material S is tilted at an appropriate angle θ0 in the direction opposite to the advancing direction (indicated by the arrow in the figure) (the entry side of the rolled material), and the rolled material S is bitten by the vertical roll 1 in this inclined state. Let it happen. The rolled material S caught in the vertical roll 1 is rolled down in the width direction by the rolling load F of the vertical roll 1, but at this time, the vertical roll 1 is arranged at an angle with respect to the edge of the rolled material S. Due to the combination of the rotational direction of the vertical roll 1 and the motion vector in the release direction of the rolled material S, the rolled material S is
An upward deformation occurs at the edge, and a downward curved deformation occurs (due to the bending moment caused by the movement of the point of application of the rolling load F on the rolled material S, which has turned to the deformation of the edge). It turns out. This downward curved deformation of the rolled material S collides with the table rollers 2 disposed between the vertical rolls 1, and is supported by a reaction force, resulting in rolling by the rolling load F during width adjustment rolling. The bending moment for the material S must be balanced. In other words, by regulating the direction of deformation of the rolled material S during punching and balancing the deformation by the table rollers, the bending moment can be balanced.
The formation of the Tsukling is transferred to the suppressing means, thereby performing the width adjustment reduction.

Figure 5 now shows the results of an experiment using plasticine. As the rolled material S, a plasticine flat plate cooled to zero degree C with a thickness of 16 mm and a width of 150 mm was used as a T vertical roll to provide a smooth roll as well as a 5° inclination, which has been proposed as a conventional method for preventing buckling. The inclination angle θ of the vertical roll is θ°, 2
Tilt within the range of 5 degrees, and the amount of reduction at that time 5 mm l 10 mm m 15 mm
K change sase went.

In Figure 4, the horizontal axis shows the set reduction amount γ (m→), and the vertical axis shows the actual reduction amount γ' (mm).As is clear from this result, when the reduction amount is small (5 mm) There is no difference in the effect, but the set reduction amount is 16 mm.
In cases where the width exceeds 2°, buckling occurs in all cases other than those using smooth rolls with a 2° and 5° inclination and tapered rolls with a 5° inclination, and there is almost no width reduction. , furthermore, the set reduction amount is 1
It is understood that when the width is 5 mm, even if the tapered roll is inclined by 5 degrees, bank ring occurs and the width reduction is hardly achieved.On the other hand, when a smooth roll is used, it is difficult to achieve sufficient width reduction. In other words, it is recognized from this result that the effect is maximized when the reduction is large.

Further, FIG. 6 shows the influence of the inclination angle of the vertical roll according to the present invention on the width reduction amount in relation to the reduction amount that causes buckling at each inclination angle. As is clear from this result, it is understood that as the inclination angle increases, the critical reduction amount that causes bank ring increases.

In the above explanation, a vertical roll having a smooth surface is placed in advance in a direction opposite to the direction in which the rolled material advances (the direction in which the rolled material approaches).
Although the case of rolling with an inclination has been described above, a phenomenon in which the rolled material lifts up may occur during 5-width rolling. Regarding this lifting of the rolled material, since the vertical rolls are inclined in the direction in which the rolled material enters, it is thought that the edge portions can be prevented by the pushing force of the vertical rolls themselves at the biting position. Depending on the inclination angle of the rolls, for example, if the inclination angle is small, this effect may be expected, but it is also assumed that a floating phenomenon may occur, but in such a case, one of the vertical rolls, It has been confirmed that 11) prevention can be prevented by adjusting the inclination angle of the vertical roll on the side where the uplift occurs. For example, by gradually adjusting the inclination angle of the vertical roll on the side where the uplift occurs in the rolled material to 0° In other words, if lifting cannot be avoided even with this, the vertical roll is further tilted in the direction of movement of the rolled material. It is possible to prevent this. Furthermore, the present invention can naturally be applied to cases where the thickness of the rolled material is thinner than the caliber dimension when width adjustment rolling is performed using a vertical roll with a caliber.

Next, with reference to FIGS. 7 to 9, a schematic configuration of a rolling mill for carrying out the FJ rolling method of the present invention will be explained, but this is not intended to limit the present invention in any way.
This is merely a preferred example, and in the illustrated embodiment, the structure of one half of the vertical edger is shown for ease of understanding, but the same structure is adopted for the other half. Reference numeral 10 denotes a housing of a vertical edger, and a frame 11 is mounted on this housing 10 so as to be able to move forward and backward in the width direction of the rolled material, for example, by wheels 12 rolling on the housing 10. A lowering screw 14 of the lowering mechanism 13 consisting of a provided worm screw
is connected to. A vertical roll 15 rotatably supported by a chock 16 on the frame 11 is fitted and supported at its lower part by a stepped portion 18 of an upwardly opening receiving plate 17 rotatably mounted on the frame 11. . On the other hand, the upper part of the vertical roll 15 is supported by a piston 20 of a cylinder 19 installed on the inner surface of the frame 11 in the frame 11 facing the direction of movement of the rolled material. The roll 15 has a structure that allows it to tilt in the same direction or in the opposite direction to the traveling direction of the rolled material within a vertical plane parallel to the traveling direction of the rolled material. 21 is a table roller arranged on a pair of vertical rolls 15.

Incidentally, the vertical roll 15 is driven in the same manner as in the prior art, although illustration thereof is omitted.

In the above-mentioned vertical extrusion, the reduction mechanism 13 is operated to drive the reduction screw 14 to apply a required amount of reduction to the vertical roll 15, and the vertical roll 15 is moved to a vertical plane parallel to the traveling direction of the rolled material S. inside and in a direction opposite to the traveling direction of the rolled material. That is, if the rolled material S is now moving in the direction of the arrow in FIG. When the chock 16 is pressed, the vertical roll 15
is rotated by the action of the receiver 17 that supports its lower end, and is tilted by an angle θ to the left in the figure on the entry side of the rolled material, that is, in the opposite direction to the advancing direction of the rolled material S. . In this state, the width adjusting reduction is often performed.If the primary rolling is performed reversibly, the cylinder 19 on the left side is operated contrary to the above, and the vertical roll 15 is tilted to the right. I do.

During rolling, when one-sided lifting occurs in the rolled material S and an impediment to width adjustment rolling occurs, the left cylinder 19
is operated to adjust the inclination angle θ of the vertical roll 15 on the side where the lifting occurred, and for example, as described above, return the inclination angle θ of the vertical roll 15 to 0°, that is, an appropriate angle to the vertical state. Alternatively, floating of the rolled material S can be prevented by tilting the vertical roll 15 to the right (in the same direction as the traveling direction of the rolled material) to an appropriate angle.

As is clear from the above, according to the edger rolling method of the present invention, the width reduction is achieved by tilting the vertical rolls in a direction opposite to the traveling direction of the rolled material in a vertical plane parallel to the traveling direction of the rolled material. By doing so, the rolled material is deformed to curve downward, this deformation is supported by a reaction force by the table roller, and the bending moment generated in the rolled material due to width reduction is balanced by the table roller. It is possible to increase the amount of width reduction for the rolled material by preventing buckling, and it is also possible to eliminate restrictions on the width dimension of the material (rolled material). By preventing rings, width accuracy can be improved and product yield can be improved, making it a great contribution to industry.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the conventional edger rolling state, Figure 2
4 to 4 are schematic explanatory diagrams showing the edger rolling method of the present invention, FIG. 5 is a diagram showing experimental results to demonstrate the width reduction effect of the present invention, and FIG. 6 is a diagram showing the results of an experiment to demonstrate the width reduction effect of the present invention. Figure 7 showing experimental results showing the influence of inclination angle on rolling reduction amount.
The figure is a partially schematic front view of the vertical edger, FIG. 8 is a side view taken along the line v--v in FIG. 4, and FIG. In the figure, 10 is a housing, 11 is a frame, and 15
is a vertical roll, 16 is a chock, 19 is a cylinder, 20
is a piston. Patent applicant Yoshiyuki Kaji, patent attorney representing Kobe Steel, Ltd. Figure 1? Figure 4

Claims (1)

[Scope of Claims] (11) In a method for edge rolling of plate materials in which a width reduction stand having a pair of vertical rolls rolls a rolled material to a required width, the pair of vertical rolls are arranged vertically parallel to the traveling direction of the rolled material. The rolled material is bitten with the in-plane inclined in the direction opposite to the direction of travel, and by applying width reduction, the rolled material is deformed to curve downward, and this deformation of the rolled material is transferred to the roll Edger rolling of a plate material, characterized in that a table roller disposed between the two supports the reaction force, and the bending moment generated in the rolled material during width reduction is balanced by the table roller to perform width reduction. Method.