JPH06218402A - Tandem rolling mill line - Google Patents

Abstract

PURPOSE:To improve controllability of a sheet shape without necessitating to slow down rolling speed at the time of correcting defect of sheet shape by providing sleeve type divided back-up rolls on the rolling mill in the final stage of a rolling mill line of plural stages. CONSTITUTION:A tandem mill line 20 is composed by arranging 1st-5th stage rolling mills 21-25 which are provided with upper and lower work rolls 51 and back-up rolls 61 in a line. A rolled stock 50 is stepwise rolled through these rolling mills 21-25 successively. Then, the sleeve type divided back-up rolls 10 are provided in the rolling mill 25 at least in the final stage of the rolling mill line 20 of the plural stages. The rolled stock 50 is rolled while executing sheet shape control like a curve of the second order with the rolling mills 21-24, rolled to an aimed thickness and also combined sheet shape control is executed to the rolled stock 50 using M-shaped crown pattern in the screw-down position V. In this way, the unsuitable sheet shape of the rolled stock is properly controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a row of tandem rolling mills having a plurality of rolling mills arranged in a row.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing a concept of an example of a conventional tandem rolling mill train. As shown in FIG. 5, the tandem rolling mill train 40 includes a work roll 51 and a reinforcing roll 61.
A first stage rolling mill 41, a second stage rolling mill 42, and
It comprises a third stage rolling mill 43, a fourth stage rolling mill 44, and a fifth stage rolling mill 45.

Each of the rolling mills 41 to 45 of the tandem rolling mill train 40 rolls the rolled material 50 in stages to a target thickness.

[0004]

The above-mentioned conventional tandem rolling mill train has the following problems to be solved.

That is, in the conventional tandem rolling mill train, a quadratic curved plate shape defect of the rolled material can be controlled to some extent by the combination of roll bending and roll crown of the work rolls of each rolling machine. However, there was a problem that it could not be applied to the composite plate shape control such as quarter extension.

Further, there is a tandem rolling mill train in which a multi-stage cluster rolling mill excellent in controllability of the composite plate shape is arranged at the final stage, but its structure is complicated and there are problems such as limitation of rolling speed. was there.

In order to solve the above problems, it is an object of the present invention to provide a tandem rolling mill train including a sleeve roll mill having at least the last stage of a rolling mill train of a plurality of stages with a sleeve type split reinforcing roll.

[0008]

As a means for solving the above problems, the present invention provides a tandem rolling mill train in which a plurality of rolling mills are arranged in a row and rolling materials are rolled in stages through the rolling mills in sequence. It is an object of the present invention to provide a tandem rolling mill train characterized in that at least the rolling mill at the final stage of the rolling mill train of a plurality of stages comprises a sleeve roll rolling mill equipped with a sleeve type split reinforcing roll.

[0009]

Since the present invention is constructed as described above, it has the following actions.

That is, since at least the final rolling mill of the rolling mill train of a plurality of rolling mills is a sleeve roll rolling mill equipped with the sleeve type split reinforcing rolls, the rolled material is transferred from the first rolling mill of the tandem rolling mill train. The rolling mills in the stages near the last rolling mill are sequentially passed to roll to the desired thickness.

Then, at the time of rolling by the final rolling mill or the sleeve rolling mill at the final rolling stage and its vicinity, the composite plate shape control of the rolled material is performed so that the plate shape can be improved without lowering the rolling speed. You can

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic side view of a tandem rolling mill train of this embodiment, and FIG. 2 is a front view showing a sleeve roll rolling mill, that is, a fifth rolling mill 25, which is the final rolling mill of FIG. 3 is an explanatory view showing an eccentric state of each reinforcing roll of FIG. 2, and FIG. 4 shows a change of the crown pattern of each of the sleeve type split reinforcing rolls 10 of the fifth rolling mill 25 of FIG. 2 at each rolling position. It is a diagram showing.

In FIG. 1, the tandem rolling mill train 20 is
First-high rolling mill 21, second-high rolling mill 22, and third-high rolling mill 2 equipped with upper and lower work rolls 51 and reinforcing rolls 61
A third and fourth stage rolling mill 24 and a sleeve roll rolling mill equipped with a sleeve type split reinforcing roll 10 on the upper part, that is, a fifth roll rolling mill.
The rolling mill 25 is used.

In FIG. 2, the roll shaft 1 is provided with a center eccentric shaft portion 1a, a pair of left and right quarter eccentric shaft portions 1b and side eccentric shaft portions 1c having different diameters from the eccentric direction, and these eccentric shaft portions 1a. ~ 1c is rolling bearing 2a
˜2c are fitted respectively, and the outer races of the rolling bearings 2a to 2c form a center reinforced roll 3a, a pair of left and right quarter reinforced rolls 3b, and a side reinforced roll 3c that rotate freely. A cylindrical sleeve 4 is loosely fitted to each of the reinforcing rolls 3a to 3c divided in the axial direction. As shown in FIG. 3, the axial centers Oa, Ob, Oc of the reinforcing rolls 3a to 3c are eccentric from the axial center O of the roll shaft 1, and the crown shown in FIG. Form a pattern.

The above-mentioned members constitute the sleeve type split reinforcing roll 10.

The fifth-stage rolling mill 25 includes the sleeve-type split reinforcing roll 10 described above, a bearing box 5 that supports both ends of the roll shaft 1 with housings 60, and a worm wheel mounted on the drive side of the roll shaft 1. 6 and the worm 7, the work roll 51 and its bearing box 52, the one-piece reinforcing roll 61 supporting the work roll below, and its bearing box 6
It has 2 main components.

Next, the operation of this apparatus will be described.

The rolled material 50 is sequentially rolled by the first-stage rolling mill 21 to the fourth-stage rolling mill 24 of the tandem rolling mill train 20 while controlling the quadratic plate shape, and the final stage, the fifth rolling stage. When the rolled material 50 is rolled to a target thickness by the rolling mill 25 and there is a plate shape defect such as quarter elongation in the rolled material 50, the M-shaped crown pattern at the rolling position V shown in FIG. Performs plate shape control. At that time, there is no need to reduce the rolling speed.

The present invention is not limited to the above-mentioned embodiment, and a sleeve roll rolling machine is also provided in the fourth rolling mill 24, and the fourth rolling mill 24 and the fifth rolling mill 25 Two
The shape of the composite plate of the rolled material 50 may be controlled by the sleeve roll rolling machine of the table.

As described above, according to the above-described embodiment, the sleeve roll rolling machine using the sleeve type split reinforcing rolls 10 is used for the fifth rolling mill 25, which is the final stage of the tandem rolling mill train 20, so that the quarter rolling mill is used. There is an advantage that the composite plate shape control can be appropriately performed and corrected even for the plate shape defect such as elongation.

When controlling the shape of the composite plate,
There is an advantage that it is not necessary to reduce the rolling speed.

[0023]

Since the present invention is constructed as described above, it has the following effects.

That is, in the present invention, since the sleeve roll rolling mill is arranged at least at the final stage of the tandem rolling mill train, it is possible to appropriately control the inappropriate plate shape of the rolled material. Further, since the controllability of the composite plate shape in high speed rolling is excellent and the range thereof is wide, it is not necessary to reduce the rolling speed when correcting the plate shape defect, and the plate shape controllability is improved.

[Brief description of drawings]

FIG. 1 is a schematic side view of an array of tandem rolling mills according to an embodiment of the present invention,

2 is a cutaway front view of a sleeve roll rolling mill which is the final rolling mill of FIG. 1;

FIG. 3 is an explanatory view showing an eccentric state of each reinforcing roll of FIG.

FIG. 4 is a diagram showing a change in crown pattern at each rolling position of the sleeve-type split reinforcing roll shown in FIG. 2;

FIG. 5 is a schematic side view of a row of conventional tandem rolling mills.

[Explanation of symbols]

 1 Roll Shaft 3a Center Reinforcing Roll 3b Quarter Reinforcing Roll 3c Side Reinforcing Roll 4 Sleeve 10 Sleeve Split Reinforcing Roll 20 Tandem Roller Mill 21 First Stage Roller 22 Second Stage Roller 23 Third Stage Roller 24 Fourth Stage Rolling mill 25 5th stage rolling mill 50 Rolled material

Claims (1)

[Claims] 1. A tandem rolling mill train in which a plurality of rolling mills are provided in a row and rolling material is rolled step by step through the rolling mills, and at least the final rolling stage of the rolling mill train is provided. A tandem rolling mill train characterized in that the rolling mill comprises a sleeve rolling mill equipped with a sleeve type split reinforcing roll.