JP3165331B2 - Positioning device for heating device of different width connection billet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for a heating device for a connecting steel slab having a different width, and more particularly to a rear end of a preceding steel slab and a front end of a succeeding steel slab having a width different from that of the preceding steel slab. The present invention relates to a positioning device for heating the vicinity of a connection point of a different width connection steel slab that is continuously hot-rolled by being connected by using a heating device.

[0002]

2. Description of the Related Art Conventionally, in a hot rolling line, before a slab after rough rolling is finish-rolled, the temperature-lowering portions at both ends in the sheet width direction of the slab are improved for the purpose of quality improvement. For example, heating using a heating device such as an induction heating method to uniform the temperature in the width direction of the plate is widely performed.

At this time, as shown in FIG.
The end portion 1a by using a heating device 2, 2 a, although heat the 1a, there is no change about the same plate width W ₀ of the steel strip 1 from the tip to the rear end, several even mm As shown in FIG. 3 (b), the amount of entry L ₀ of the center portions 2a of the heating portions of the heating devices 2 and 2 into the steel slab 1 in the width direction of the steel slab is as shown in FIG. Heat at a fixed position to the end,
A so-called fixed-position heating method is generally used.

[0004]

In recent years, FIG.
As shown in FIG.₁End of the preceding slab 11 and the sheet width W
_TwoConnect the tip of the succeeding billet 12 at the connection point 13
Examples of rolling are increasing. Such a billet (hereinafter referred to as
1A uses heating devices 2 and 2
When heating the sheet width direction ends 1a, 1a
Position L of hot spot center point 2a, 2a from end of steel piece₀The contact
In accordance with the progress of the heating device 2 at connection point 13,
The temperature rise at the end portions 1a, 1a in the width direction follows the preceding steel piece 11
Entry amount of heating devices 2 and 2 so that billet 12 is optimal
L₀So-called variable position adjustment
It is necessary to use a thermal method.

[0005] This is because the amount of entry L ₀ for obtaining the optimum temperature rise is usually constant without depending on the sheet width. If the heating positions of the heating devices 2 and 2 are not changed, one of them will not be able to obtain an optimum temperature rise, so that it is avoided. However, in the conventional hot rolling line, a fixed position heating method for so-called batch materials, in which each piece is individually rolled, is mainly used, and a variable position heating method suitable for different width connection steel pieces. Has not been proposed, and there has been no technology for optimally heating and heating the ends of the leading and succeeding billets 11 and 12 in the sheet width direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a positioning device for a heating device for different width connection steel slabs which has solved the above-mentioned problems of the prior art.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for connecting a trailing end of a preceding billet and a leading end of a succeeding billet having a plate width different from that of the preceding billet to perform continuous rolling. In the positioning device of the heating device for heating the end of the billet in the width direction of the billet, conveying speed detecting means for detecting the conveying speed of the different width connecting billet,
A connection point detecting means for detecting a connection point of the different width connection steel slab, a heating apparatus moving means for moving the heating apparatus in a plate width direction, and a moving speed of the heating apparatus moved by the heating apparatus moving means, Heating device positioning control for controlling the heating device moving means by determining a heating position in the sheet width direction of the heating device from the conveying speed of the different width connecting billet and the difference in plate width between the preceding billet and the succeeding billet. A positioning device for a heating device for a different width connection steel slab.

It is desirable that the moving position of the heating device by the heating device positioning control means is set to a point which is の of the plate width difference at the time of passing the connection point.

[0009]

According to the present invention, the amount of entry of the heating device is determined by using the speed signal of the different width connecting steel slab, the detection signal of the connection point of the different width connecting steel slab, and the moving speed signal of the heating device moving means. The heating position from the end in the plate width direction can be optimally determined for both the leading and succeeding billets in the different width connection billet, and thereby the end in the plate width direction can be determined. It is possible to suppress the generation of a low-temperature portion that occurs in the above.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention, and the same members as those of the conventional example are denoted by the same reference numerals. In the drawing, reference numeral 3 denotes a heating device moving device such as a hydraulic cylinder which enables the heating device 2 to move in the width direction of the different width connection steel slab 1A, and 4 denotes a different width connection steel slab 1A.
A transport speed detector such as a pulse transmitter for detecting the transport speed of the steel plate, a connection point detector such as a plate width gauge for detecting a connection point 13 of the different width connection steel slab 1A, and a heating device 2 for example. , 2 for determining the heating position in the plate width direction.

Therefore, in the heating device positioning control device 6, the leading billet 11 and the trailing billet 12 of the different width connecting billet 1A.
Of the sheet widths W ₁ and W _2, and the transfer speed and the like of the different width connection steel slab 1A from the transfer speed detector 4,
The following processing is performed. Now, as shown in FIG. 2, the different width connection steel slab 1A is assumed to be conveyed in the direction of arrow F, and the amount of the heating devices 2 and 2 entering the preceding steel slab 11 (the heating position HL from the end). the distance) to ₁ and L _1, the succeeding steel piece
Assuming that the entering amount at 12 (the distance from the end to the heating position HL ₂ ) is L ₂ , the moving stroke L _S of the heating device moving device 3 in which the heating device 2 must be moved at the connection point 13 is as follows.
It can be obtained by equation (1).

[0012] _{L S = {(W 2/} 2) -L 2} - {(W 1/2) -L 1} ............... (1) of the heating device 2 by the heating device moving device 3 in this case Assuming that the maximum moving speed is v _S , the time t ₁ required to cross the moving distance L _S is obtained by the following equation (2). The maximum moving speed v _S of the heating device 2 is determined by the specifications and capabilities of the heating device moving device 3, but the moving speed may be measured using, for example, a pulse transmitter.

T ₁ = L _S / v _S (2) At the timing when the connection point 13 passes through the heating device 2, the connection point 13 moves, for example, by a stroke exactly の of the movement distance L _S. Therefore, the time t ₂ required for the traversing of the heating device 2 in that case is obtained by the equation (3). _{t 2 = t 1/2 =} L S / (2v S) ............... (3) where the moving distance of the moving stroke of the heating device 2 at the time of the connection point 13 passes through the heating device 2 L _S As a supplementary reason, when there is no large difference in the sheet width between the preceding billet 11 and the succeeding billet 12 (for example, less than 100 mm), the different width connecting billet 1A before the coiler after finish rolling is applied. It is based on the idea that it is appropriate to make the crop length of the leading billet 11 and the trailing billet 12 the same length. If the difference is, for example, 100 mm or more, it is desirable from the viewpoint of the product yield that the positioning is performed so that the sum of the areas of the non-heated portions of the two is minimized.

Next, assuming that the maximum conveying speed of the different width connection steel slab 1A is v _M , the heating device 2 is turned off when the connection point 13 reaches a point x ₁ on the upstream side from the position A of the heating device 2. rampant started, so that it may do it to stop moving at point B in time t ₁ after the lapse. Distance x ₁ at that time is determined by the following equation (4). x ₁ = v _M · t ₂ (4) The distance x ₁ is a distance between the connection point detector 5 and the heating device 2 is L _3, and the connection point detector 5 of the connection point 13 is L _3. progress quantity L _x from may be translated into the _{L x = L 3 -x 1 ...............} (5) since the timing.

Further, after the movement start, there is a case where the mobile speed of the different width connecting steel strip 1A is changed, the movement amount L ₄ after movement start from the point when A to point C at the connection point 13 The heating position of the heating device 2 may be determined by the following equation (6). L ₄ = (v _S / v _M ) · (L ₃ −L _x ) (6) Therefore, the width W ₁ of the preceding steel slab 11 as the different width connecting steel slab 1A: 1200 mm; In the actual operation in which the plate width W ₂ of the piece 12 was connected to 1300 mm, the maximum conveying speed v
_M : When transported at 100 mpm, the maximum moving speed v _S ; 200 m
Using the heating device 2 of m / sec, the connection point detection of the amount of entry L ₁ from the end of the preceding slab 11; 100 mm and the amount of entry L ₂ from the end of the following slab 12; Under the condition that the distance L ₃ between the vessel 5 and the heating device 2;
A edge heating was performed.

As a result, the lengths of the unheated portions at the rear end and the front end of both the leading slab 11 and the trailing slab 12 can be set to approximately the same value of about 210 mm and about 210 mm, respectively. It was possible to suppress the temperature difference between the end portion in the plate width direction and the central portion within about 30 ° C. and about 30 ° C., respectively. Although the above embodiment has been described by way of example where the width of the succeeding billet 12 is wider than the width of the preceding billet 11,
The present invention is not limited to this, and it goes without saying that the present invention can be similarly applied even when the width of the succeeding billet 12 is smaller than the width of the preceding billet 11.

[0017]

As described above, according to the present invention,
Since the heating position from the end in the sheet width direction can be optimally determined for both the leading and succeeding billets in the different width connection billet, the low-temperature part generated at the end in the sheet width direction It is possible to suppress the occurrence and contribute to improvement of product quality and yield.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the present invention.

3A is a front view and FIG. 3B is a plan view showing a conventional example.

FIG. 4 is an explanatory view of a different width connection steel slab.

[Explanation of symbols]

1A Different width connection steel slab 2 Heating device 3 Heating device moving device (Heating device moving means) 4 Transport speed detector (Transport speed detecting device) 5 Connection point detector (Connection point detecting device) 6 Heating device positioning control device (Heating Device positioning control means) 11 Leading billet 12 Trailing billet 13 Connection point

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 1/26 B21B 15/00 B21B 45/00

Claims (2)

(57) [Claims] 1. An end portion in the width direction of a different width connection steel slab which is continuously rolled by connecting a rear end of a preceding slab and a front end of a succeeding slab having a different width from the preceding slab. In a positioning device of a heating device for heating the heating device, a conveying speed detecting means for detecting a conveying speed of the different width connection steel slab, a connection point detecting means for detecting a connection point of the different width connection steel slab, and the heating device A heating device moving means moving in the sheet width direction; a moving speed of the heating device moved by the heating device moving means; a conveying speed of the different width connecting steel slab; a sheet width difference between the preceding steel slab and the succeeding steel slab. And a heating device positioning control means for controlling the heating device moving means by determining a heating position of the heating device in the width direction of the heating device. 2. The different width connection steel according to claim 1, wherein the movement position of the heating device by the heating device positioning control means is set to a point which is の of the plate width difference at the time of passing the connection point. Positioning device for piece heating device.