JPH0515906A - Rolling mill - Google Patents

Abstract

PURPOSE:To make local shape correction of rolled stock possible by arranging press rolls on the outlet and inlet sides of rolled stock of an intermediate roll and generating deformation in the vertical direction by pressing the intermediate roll from both sides. CONSTITUTION:A material 13 to be rolled is rolled with working rolls 1, 2 and the rolling reaction force of the working roll 1 is supported with a back-up roll 5 through the back intermediate roll 3. The intermediate roll 3 is deformed like the broken line by being pushed with the press rolls 7, 8. By this effect, the working roll 1 becomes the position of the broken line and the material 13 to be rolled is made into the thickness shown by the broken line. The positions in the breadthwise direction of the material 13 to be rolled which is thinly extended are the parts where are pushed with the press rolls 7a, 8a or the press rolls 7b, 8b and local shape control is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill, and more particularly to a rolling mill suitable for shape control and crown control.

[0002]

2. Description of the Related Art Many rolling mills have been proposed for the purpose of shape control and crown control. In particular, an apparatus that attempts to perform shape control by flexing a roll in the horizontal direction utilizes the influence of the flexure in the horizontal direction of the roll on the vertical direction as described in Japanese Patent Laid-Open No. 49-115968.

[0003]

The above-mentioned prior art attempts to flex the roll in the horizontal direction and perform shape control corresponding to this flexure. However, since the flexure is drawn with a smooth curve, the local flexure is locally generated. It was impossible to correct the defective shape.

The vertical roll bending method also has the same problem as described above.

In JP-A-55-30390, roll horizontal support rollers are arranged on both sides of the roll in order to suppress horizontal deflection of the roll, so that the shape of the material to be rolled is controlled by the support rollers. Not a thing.

An object of the present invention is to solve the local shape defect of the rolled material.

[0007]

The above object can be achieved by producing a local convex portion on the crown in the roll body rolling direction.

[0008]

When a compressive load is applied to two opposite faces of a cube, the cube normally shrinks in the compression direction and expands in the direction perpendicular to the compression direction. The present invention utilizes this principle. In the roll axial direction, the deformation is ignored, and the roll is sliced into circular sections. When the roll body is pressed in a certain range in the roll axial direction from both sides of the roll in the horizontal direction, the roll tries to spread in a direction perpendicular to the pressed direction. This means that the roll has a locally convex crown in the vertical direction.
The shape can be controlled by arranging the crown rolls in the vertical direction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The work rolls 1 and 2 arranged above and below the material 13 to be rolled are supported by the reinforcing rolls 5 and 6 via the intermediate rolls 3 and 4 behind them, respectively. Pressing rollers 7, 8, 9, 10 are provided on both sides of the intermediate roll in the rolling direction. As shown in FIG. 3, if the pressing rollers 7 and 8 that are movable in the axial direction are pushed in the direction of the arrow at arbitrary positions, the portion of the intermediate roll 3 pushed by the holding rollers is deformed as shown by the broken line.
Due to this influence, the work roll 1 and the reinforcing roll 5 also have the position or shape of the broken line, and the material 13 to be rolled has the thickness shown by the broken line, so that the range in which the intermediate roll is pressed by the pressing roller is thinly extended. FIG. 2 is a view of FIG. 3 viewed from above.
The position in the width direction where the material 13 to be rolled is thinly extended corresponds to the portion pressed by the pressing rollers 7a and 8a or the pressing rollers 7b and 8b. Therefore, local shape control is possible.

The work rolls 1, 2 and the intermediate roll 3,
By applying a bending force to No. 4 and shifting the axial direction, it is possible to obtain a rolling mill excellent in shape control having both functions of rough shape control and local shape control.

FIG. 4 is a view in which the pressing rollers 7, 8, 9, 10 are inclined. Since the vertical component of the pressing force in the arrow direction is added to the rolling load axial direction distribution by inclining the pressing roller, the positions pressed by the pressing rollers 7, 8, 9, 10 are
It will be reduced more. In this case, FIGS.
It also includes the contents explained in.

FIG. 5 is a view in which the hollow intermediate rolls 11 and 12 are used. This is an example in which the effect of pressing by the pressing rollers 7, 8, 9, 10 is further increased by making the roll hollow.

FIG. 6 shows an example in which this system is adopted in a small diameter work roll rolling machine. The horizontal force received by the small-diameter work rolls 14 and 15 is supported by the split support rollers 18 and 19 via the support rollers 16 and 17.

7 to 10 show the case where the present invention is applied to the work rolls and the reinforcing rolls of the four-high and six-high rolling mills. Also in this case, the same effect as when the intermediate roll is pressed can be exhibited. Further, as shown in FIG. 5, by making each of the rolls to be pushed hollow, it is possible to further increase the effect of the pressing by the pressing rollers 7, 8, 9, 10. FIG. 11 is a diagram in which a VC roll is used as an intermediate roll of a six-high rolling mill and the present invention is applied to this VC roll. Also in this case, the effects described above are obtained.

Although not described in the above figures, a rolling mill in which one side is a cluster type and one side is combined with one side of a multi-stage mill such as four stages in this method, and an intermediate roll is provided only for one side. It can also be applied to a five-high rolling mill having a.

When a local mark is transferred to the material to be rolled by pressing a pair of pressing rollers, it can be dealt with by reciprocating the pressing rollers in the small amount axial direction.

[0017]

According to the present invention, a local convex portion can be generated in the crown in the rolling direction of the roll body portion, so that there is an effect of local shape correction.

[Brief description of drawings]

FIG. 1 is a front view showing a roll arrangement according to an embodiment of the present invention.

FIG. 2 is a plan view of an intermediate roll unit shown in FIG.

FIG. 3 is a detailed view of FIG.

FIG. 4 is a front view in which a pressing roller is inclined.

FIG. 5 is a front view in which a hollow roll is used as a pressing roll.

FIG. 6 is a front view of the present invention applied to a rolling mill having a small diameter work roll.

FIG. 7 is a front view of the present invention applied to a work roll of a four-high rolling mill.

FIG. 8 is a front view of the present invention applied to a reinforcing roll of a four-high rolling mill.

FIG. 9 is a front view of the present invention applied to a work roll of a six-high rolling mill.

FIG. 10 is a front view of the present invention applied to a reinforcing roll of a six-high rolling mill.

FIG. 11 is a front view in which a VC roll is used as an intermediate roll of a six-high rolling mill and the present invention is applied to this VC roll.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper work roll, 2 ... Lower work roll, 3 ... Upper middle roll, 4 ... Lower middle roll, 5 ... Upper reinforcement roll, 6 ... Lower reinforcement roll, 7-10 ... Press roll.

Claims (6)

[Claims] 1. A rolling mill having a work roll for rolling a material to be rolled, and a rolling mill having a plurality of reinforcing rolls behind at least one of the work rolls and a plurality of rolling mills at least one of the work rolls and the reinforcing rolls. In a rolling mill provided with two intermediate rolls, at least one of the rolls is provided with a pair of rollers on both sides of the roll body in the roll axial direction at any position in the axial direction of the rolled material, and the rollers are arranged on both sides of the roll. It is characterized in that when pressed from above, deformation is generated at the pressed position in a direction perpendicular to the pressing direction, not the roll axial direction, and the roll axial thickness distribution of the material to be rolled is controlled or the shape is controlled. Rolling mill. 2. A rolling mill according to claim 1, wherein a pair of rollers arranged so as to be movable in the roll axial direction is capable of pressing an arbitrary axial position of the roll body portion from both sides. 3. A rolling mill according to claim 1, wherein a pair of rollers arranged in a pair can be reciprocated in the roll axial direction at an arbitrary speed and cycle. 4. A rolling mill according to claim 1, wherein a pair of rollers arranged in a pair is inclined in the direction of the material to be rolled. 5. The rolling machine according to claim 1, wherein the roll whose body portion is pressed by a pair of rollers arranged in a hollow form is a hollow roll. 6. The rolling mill according to claim 1, wherein the roll whose body is pressed by a pair of rollers arranged in a pair is a VC roll.