JPS60180614A - Rolling method - Google Patents

Abstract

PURPOSE:To roll the crown of the width-end part of a rolling material into an optimum shape by changing the length of a part at which the width-end part of rolling material comes into contact with the taper part of a work roll in accordance with the shape of the width end of material in a rolling mill wherein the work roll having a taper side-end is shifted. CONSTITUTION:The shape of the width-end part of a rolling material is detected by shape detectors 11, 11', and its signal is processed by a signal processing unit 12 to recognize the shape shown by the figure for instance. The recognition signal is transmitted to an arithmetic unit 13 to operate the shifting amounts of work rolls 1, 2, and the shifting amounts are outputted, as command signals to roll shifting devices 14, 15 to move the rolls 1, 2 by the prescribed quantities to the rightward or leftward directions as shown by the figure. In this way, a roll gap G at the width end of rolling material 10 is reduced to perform rolling by reducing the length (l) of a part at which the material 10 comes into contact with the taper parts of rolls 1, 2. Accordingly, the exellent cross-sectional profile of material 10 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling method that allows control of the crown at the width end of a rolled material.

[Conventional technique 11! i1 When rolling is carried out using a normal four-high rolling mill, there is a risk that edge drops may occur at the width ends of the rolled material, as shown in the cross-sectional profile of the rolled material in FIG. In order to prevent the occurrence of such edge drops, a rolling mill as shown in FIG. 2 has been proposed in recent years.

In Fig. 2, 1.2 is a pair of upper and lower work rolls that are rotatably supported by a working shaft box 3.4 and can be shifted in opposite directions, and 5 and 6 are stand-up shaft boxes. 1.8 is a backing roll rotatably supported for backing up the working wheel 1.2; 9 is a reduction screw; the end opposite to the upper and lower working wheels 1.2; There is a taper formed in a tapered shape toward the 0-ru end side.

In such a rolling mill, the work rolls 1 and 2 are shifted in opposite directions, and one width end of the rolling roll 410 is positioned on the tapered part of the work roll 1, The other width end of the rolled material 1o is positioned in a part, and rolling is performed while applying appropriate roll bending force to the work rolls 1.2 as necessary. Ideally, a flat plate with less edge drop can be obtained as shown in the cross-sectional profile of the rolled material in Figure 3 (a), but depending on the rolling conditions, the rolled material shown in Figure 3 (b) can be obtained. As shown in the cross-sectional profile, rolling history may remain and ears may appear at both ends of the rolled material.

[Objective of the Invention] The present invention optimizes the plate crown at the width end of the rolled material by preventing edge drops from occurring at both ends of the rolled material or ears from forming at both ends of the rolled material after rolling. This was done for that purpose.

[Structure of the Invention] In the present invention and the rolling method, a taper is provided at the end of the work roll that can be shifted in the axial direction, and depending on the rolling conditions, the width end of the rolled material can be adjusted to a length such that the width end can come into contact with a part of the taper of the work roll. The rolling process is performed by changing the Therefore, it is possible to make the crown at the width end of the rolled material into an optimal shape.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

The basic configuration of the rolling mill of the present invention is substantially the same as that shown in FIG. 2, and the work rolls 1 and 2 shown in FIG. 4 can be shifted in the roll axis direction by appropriate means. One end of the work roll 1 and the other end of the work roll 2 on the opposite side from the work roll 1 are provided with a tapered drive tapered toward the end of the roll.

During rolling, the work roll 1.2 is shifted in one direction of the roll axis, one width end of the rolled material 10 is positioned on the tapered part of the work roll 1, and the rolled material 10 is placed on the tapered part of the work roll 2. Rolling is performed with the other width end positioned.

For example, if the rolling conditions leave a rolling history as shown in the cross-sectional profile of the rolled material in Figure 3 (0) and there is a risk of ears forming on both ends of the rolled material, the work roll 1 shown in Figure 4
is moved to the left in the figure, and the work roll 2 is also moved to the right in the figure, so that the width end of the rolled material 10 is aligned with the work roll 1.
The length of the part that comes in contact with part of the taper of 2! By shortening , the rolling gap G at the width end of the rolled material 10 is narrowed, and rolling is performed. Therefore, the cross-sectional profile of the rolled material 10 becomes as shown in FIG. 3(A), and a plate with a good shape can be obtained.

In addition, if edge drops occur at both ends of the rolled material as shown in the cross-sectional profile of the rolled material in Figure 1 due to the rolling conditions,
In FIG. 4, the work roll 1 is moved to the right and the work roller 2 is moved to the left, and the width end of the rolled material 10 contacts the tapered part of the work rolls 1 and 2. difference! By increasing the length, the roll gap G at the width end of the rolled material 10 is widened and rolling is performed. Therefore, rolled material 1
The cross-sectional profile of 0 is as shown in FIG. 3 (a), and a plate with a good shape can be obtained.

FIG. 5 shows an example of a control system used in the present invention, in which 11 and 11' are shape detectors that detect the shape of the width end of a rolled material using X-rays, γ-rays, laser beams, etc.; 13 is a signal processing device that processes the signals detected by the shape detectors 11 and 11'; 13 is an arithmetic device that calculates the shift amount of work 0-1.2 based on the signal processed by the signal processing device; 1
4.15 is a roll shift device that shifts the work rolls 1 and 2 in response to a command from the performance device i13, and 16 is a monitor that allows the shape of the width end portion of the rolled material to be visually observed.

The shape of the width end of the rolled material is detected by shape detectors it, i, and i', and the signals are sent to the signal processing device 12 where predetermined signal processing is performed. The shape of the width end of the rolled material as shown in (0) is recognized, and the g* signal is sent to the calculation device 113 to calculate the shift amount of the work rolls 1 and 2, and the calculated shift amount is It is output as a command signal to the roll shift device 14.15, and based on the command signal, the roll shift devices i14, 15 are driven, and the work roll 1.2 is shifted by a predetermined amount.

It should be noted that the present invention is not limited to the above-described embodiments, and that, for example, a zero-repending device can be used in combination, and that various other changes can be made without departing from the gist of the present invention. Of course, etc.

Effect of one shot] According to the rolling method of the present invention, the length of the width end of the rolled material in contact with a part of the work roll taper can be adjusted depending on the rolling conditions, so the crown of the width end of the rolled material can be optimized. Therefore, it is possible to improve the dimensional accuracy and yield of the rolled material.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the cross-sectional profile of a rolled material when rolling is performed in a normal four-high rolling mill, Fig. 2 is an explanatory diagram of a conventional rolling mill in which a taper is provided on the outer periphery of the end of the work roll, and Fig. 3 figure(
A) and (B) are explanatory diagrams of the cross-sectional profile of a rolled material when rolling is performed using the rolling mill shown in Figure 2, FIG. 4 is an explanatory diagram of an embodiment of the rolling method of the present invention, and FIG. FIG. 2 is an explanatory diagram of an example of a control system used in the rolling method of the present invention. In the figure, 1.2 is a work roll, 5.6 is a backup roll, 10 is a rolled material, 11.11' is a shape detector, 12 is a signal processing device, 13 is a calculation device, and 14.15 is a roll shift device. . @Figure 1 12'' Figure 3 (A) (B) Figure 5 '13 12 16

Claims (1)

[Claims] 1) In a rolling mill in which a work roll having a tapered portion at the end can be shifted in the roll axis direction, the length of the rolled material is set such that the width end of the rolled material can come into contact with the tapered portion of the work roll. A rolling method characterized by detecting the shape of the width end portion and rolling the material while changing the length of the width end portion that can come into contact with the tapered portion according to the shape.