JPS6117304A - Method for controlling width of rolling stock - Google Patents

Abstract

PURPOSE:To increase considerably an edging rate and to adjust the width of a rolling stock in a large range by passing the rolling stock through the pass having the groove width of edging rolls to execute edge rolling while holding the rolling stock with said pass meeting the thickness of the rolling stock then rolling the stock with horizontal rolls. CONSTITUTION:The rolling stock 12 is first rougly rolled by a roughing mill 10 and thereafter the fluctuation in the sheet width occuring the so-called skid marks generated by such rolling is eliminated in the following manner: Both edges of the rolling stock after said rough rolling are passed through any among the passes 8a, 8b, 8c and 8d of the edging rolls 1 according to the thickness thereof, by which the fluctuation in the sheet width is corrected. Both edges of the rolling stock in the case are not expanded and deformed more than the groove width of said pass. The width increase generated by the horizontal rolls of the subsequent finish rolling mill 11 is therefore made considerably smaller than the increase by the conventional edging rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for controlling the width of a rolled material in hot rolling, and more specifically, to control the width of a rolled material by performing edging rolling between rough rolling and finishing rolling. This invention relates to a method for controlling board width.

BACKGROUND OF THE INVENTION Control of the width of a rolled material in conventional hot rolling has been carried out by controlling the tension applied to the rolled material between stands or by performing edge rolling. However, plate width control by inter-stand tension control has its own limitations because it is controlled by varying the tension value within a range that does not break the rolled material, and furthermore, fine control over a length less than the inter-stand distance is impossible. This is not practical in hot rolling where the distance between stands is large.

In other words, a natural problem in hot rolling is the temperature drop in the part of the rolled material that comes into contact with the skid/trail in the heating furnace, and fluctuations in the strip width at the so-called skid mark area, but as mentioned above, By controlling the tension between the stands, it is impossible to sub-produce fine board width control that can eliminate variations in board width caused by skid marks.

A method that has been proposed in recent years to solve this problem is to perform edge rolling in the width direction before finish rolling, thereby controlling the width of the sheet.

A schematic explanation of this board width control method is shown in Fig. 2(a).
When a rolled material having a plate width of 11 as shown in FIG. When this rolled material with a dogbone-like cross section is finish-rolled using horizontal rolls, the swollen edges of the rolled material are deformed to expand in the width direction, so that the cross-section of the rolled material becomes 12 mm as shown in Figure 2 (C). Wider β
It becomes the board width of 3. Therefore, the amount of edging (1-12) required to obtain the plate width 13 of the rolled material product was experimentally determined.
The plate width was controlled by determining the amount of edging in consideration of the steel type and heating temperature of the rolled material.

According to this strip width control method, it is possible to change the amount of etching by changing the spacing between the etching rolls for each location corresponding to skid marks, so fine strip width control can be carried out in the length direction of the rolled material. There were some drawbacks.

(2) As shown in FIG. 2(b), both edges of the rolled material form a swollen dogbone-like cross section, and this expands again in the width direction, making the width control method complicated.

■ Since flat-rolled edging rolls are used, both edges of the rolled material are not held by the edging rolls, and as the amount of edging is increased, buckling of the rolled material is likely to occur, so the limit value of the amount of edging is Relatively small.

Problems to be Solved by the Invention It is an object of the present invention to solve the above-mentioned problems of the board width control method using etching.

That is, an object of the present invention is to provide an edging rolling method that prevents both edges of a rolled material from becoming dogbone-like and has a relatively large limit value for the amount of edging that does not cause buckling, thereby achieving high precision and It is an object of the present invention to provide a method for controlling a board width that is simple and allows a large amount of board width adjustment.

Means for Solving the Problems According to the present invention, an edging roll having a plurality of hole types with different groove widths is used, and the hole type of the edging roll is selected according to the thickness of the rolled material, While holding both ends of the rolled material through the hole, the material is passed between the edging rolls.
Then a horizontal roll.

Provided is a method for controlling the width of a rolled material, which is characterized by performing rolling.

The etching roll of the present invention may be installed between a rough rolling mill for hot rolling and a continuous rolling mill group following the rough rolling mill.

Alternatively, the edge roll of the present invention may be installed continuously in a plate rolling mill, and edge rolling may be performed in the middle of plate rolling to control the plate width.

Effect of the Invention In the method of the present invention, edge rolling is carried out while holding both edges of the rolled material in the grooves using an edge roll having a hole shape corresponding to the thickness of the rolled material. Both edges do not expand and deform beyond the hole shape, and do not form a so-called dogbone-shaped cross section. Therefore, the amount of medium corrugation caused by subsequent rolling by horizontal rolls is small;
Board width control becomes more precise and simple.

Furthermore, in the edge rolling of the sheet width control method of the present invention, since both edges of the rolled material are always held within the groove of the edge roll, the rotation of the supporting end during the buckling phenomenon is prevented. will be prevented. Therefore, the limit value at which the rolled material buckles due to the edging load becomes much higher, allowing for a large amount of edging.Therefore, the plate width can be adjusted over a wide range.

Hereinafter, the present invention will be explained by examples with reference to the accompanying drawings, but it goes without saying that these examples are merely illustrative of the present invention and do not limit the technical scope of the present invention in any way. .

Embodiment Referring to FIG. 1, a pair of edging rolls used in the method of controlling strip width according to the present invention are generally indicated by the reference numeral 1, and these edging rolls 1 are used to control the width of a rolled material. are placed on both sides of the pass line.

The lower end of each edging roll 1 is rotatably attached to a support member 2. Further, the upper end of each edging roll 1 is supported by a bearing 3 and is provided with a bevel gear 4. As shown, the bevel gear 4 is connected to a gear box 5.
The edging roll 1 is housed within the edging roll 1 and engages therein with a bevel gear 7 of the drive shaft 6, whereby each edging roll 1 is rotationally driven. As in the conventional case, the support member 2 is movable in the direction perpendicular to the pass line of the rolled material, that is, in the left and right directions, so that the distance between the pair of edging rolls 1 can be adjusted. . Needless to say, such spacing adjustment is performed in response to variations in plate width caused by skid marks on the rolled material after rough rolling. Since the above-described configuration also applies to conventional edging rolls, it will not be described in further detail.

Each edging roll 1 has a plurality of hole types 3 with different groove widths.
a, 3'b, 3c and 8d, these hole types 8a1
The groove widths of 8b18C and 8d are, for example, 25 mm, 35 mm, 40 mm, and 60 mm, respectively, so that various thicknesses of the rolled material can be accommodated. In short, the thickness of the rolled material after rough rolling is usually about 25 mm to 40 mm, and one of these groove types is selected depending on the thickness of the rolled material, and the selected groove type is used for the rough rolling. The rolled material is passed through the plate, and both ends of the rolled material are edged. In order to select such a hole type, each edging roll I can be moved in the vertical direction. In this embodiment, as shown in the figure, the support member 2 is provided with a hydraulic cylinder 9, by which each edging roll 1 is moved in the vertical direction to select one of the grooves 3a, 3b, 8c and 8d. is selected.

FIG. 3 schematically shows an example in which the edging roll 1 according to the invention is used for continuous hot rolling.

In FIG. 3, a rough rolling mill 10 and a plurality of finishing rolling mills 11 are arranged along a pass line 12 of the rolled material, and a pair of edging rolls 1 are arranged in groups of a rough rolling mill and a finishing rolling mill as shown in the figure. established between.

To explain the main action in the case of continuous hot rolling illustrated in FIG. 3, the rolled material is first roughly rolled in a rough rolling mill 10. As is well known, variations in the width of a rolled material after rough rolling occur due to so-called skid marks. In order to eliminate such plate width fluctuations, the rolled material after rough rolling is then adjusted to the groove shape 8 of the edging roll 1 according to its thickness.
The plate is passed through any one of a, 8b, 8'c, and 8d, thereby correcting the variation in the width of the rolled material after rough rolling.

In the edging rolling according to the present invention, edging rolling is performed while holding both edges of the rolled material in the groove shape of the edging roll 1, so both edges of the rolled material are held in the groove shape. It will not expand or deform beyond the groove width. Therefore, the amount of width expansion caused by subsequent rolling with horizontal rolls is made much smaller than in the case of conventional edging rolling. A comparison of specific examples of subsequent plate width fluctuations of rolled materials in the case of conventional edging rolling and the case of edging rolling according to the present invention is as follows. That is, in the edging rolling according to the present invention, both edges of the rolled material are always rigidly held within the hole of the edging roll l, so that the rolled material is not seated by the edging load. The limit value that causes bending becomes significantly higher, and a larger amount of edging becomes possible.

Comparing this with the case of conventional edging rolling in a specific example, the results are as follows.

In the present invention, as shown in FIG. 4, a presser roll 13 can be provided facing the table roller 12 adjacent to the edging roll 1. Because buckling can be prevented,
This means that the amount of edging can be further increased.

Next, to describe one example of the specific dimensions of the edging roll according to the present invention, the edging roll diameter is 700 mm.
mm, and five hole molds 3a, 3b, 8C and 8d having the groove widths as described above are provided therein. These hole types can be used according to the usual method.

The hole type 8a (25 mm) is used, for example, for threading stainless steel materials, and the rough rolling thickness range is 25 m.
m or less.

The hole type 8b (35 mm) is used, for example, for threading thin ordinary steel materials, and the rough rolling thickness range is 25 m.
m to 35 mm.

The hole type 8c (40mm) is used, for example, for common steel-shell material, and the plate thickness range by rough rolling at this time is 3.
The length is 5 mm to 40 mm.

The hole type 8d (60 mm) is used, for example, for threading very thick materials, and the rough rolling thickness range is 40 mm to 60 mm.

In addition, in edging rolling with such edging rolls, the maximum load is 30 tons, and the reduction amount is 1
It is 0mm.

Further, an example of the dimensions of the rolled material, the temperature of the steel material, and the threading speed when continuous hot rolling is performed using such an edging roll is as follows.

Effects of the Invention As is clear from the above explanation, according to the grain control method of the present invention, it is possible to reduce the amount of width expansion when rolling material on an edging roll is rolled with a horizontal roll. Control becomes more precise and easier than in the conventional case.

Further, according to the wave crest control method of the present invention, the amount of edging can be greatly increased, so wave crest adjustment can be performed over a wide range. In other words, it is possible to manufacture steel plates with various wave heights from slabs of a certain standard, and it is possible to rationalize the production plan of the entire steelworks.

[Brief explanation of the drawing]

FIG. 1 is an elevational view showing an edging roll used in the wave crest control method of the present invention, FIG. 2 is an explanatory view showing the edging roll process of a rolled material by a conventional edging roll, and FIG. The figure is an explanatory diagram showing a hot rolling process using an edging roll according to the present invention, and FIG. 4 is an explanatory diagram showing a hot rolling process using a presser roll together with an edging roll according to the present invention. [Explanation of main reference numbers] 1 Edging roll 2 Support members 8a to 8d Hole type 9 Hydraulic cylinder 10 Roughing mill 11 Finishing mill 13 Presser rono station

Claims (1)

[Claims] (1) An edging roll having a plurality of groove types with different groove widths is provided between a rough rolling mill and a finishing rolling mill, and the groove type of the edging roll is selected according to the thickness of the rolled material, A method for controlling the width of a rolled material, comprising passing the material through the groove while holding both ends of the material, performing edging rolling, and then rolling with horizontal rolls.