JPH0871606A - Positioning device of heating equipment of connected slab of different width - Google Patents

Abstract

PURPOSE: To suppress the generation of a low temperature part at an end part by determining the advancement of heating equipment using the speed signal of a connected slab of different width, the detected signal of the connection points, and the moving speed signal of heating equipment moving means to optimize the heating position. CONSTITUTION: Slab widths W1 , W2 of a preceding slab and a succeeding slab of the connected slab of different width are received by a heating equipment positioning control device 6, and the carrying speed, etc., of the connected slab 1A of different width is inputted from a carrying speed detector 4. The heating position from the end part of the preceding and succeeding slabs in the width direction can be optimized by obtaining the time required for the traverse movement of a heating equipment, and the quality and the yield of the product can be improved.

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 connecting steel strips of different widths, and relates to a rear end portion of a preceding steel strip and a leading end portion of a trailing steel strip having a plate width different from that of the preceding steel strip. The present invention relates to a positioning device for heating, using a heating device, the vicinity of a connection point of connecting steel strips of different width which are continuously connected to each other and are hot rolled.

[0002]

2. Description of the Related Art Conventionally, in a hot rolling line, in order to improve the quality, the temperature-reduced portions at both ends in the plate width direction of a steel slab are finished until the steel slab after rough rolling is finish-rolled. For example, heating using a heating device such as an induction heating method to make the temperature uniform in the plate width direction is widely performed.

At this time, as shown in FIG.
The end portions 1a, 1a are heated by using the heating devices 2, 2, but the plate width W ₀ of the steel piece 1 is almost the same from the leading end to the trailing end, and even if there is about several mm. Then, as shown in FIG. 3 (b), the amount L ₀ of penetration of the heating unit center points 2a and 2a of the heating devices 2 and 2 into the steel piece 1 is as shown in FIG. Heat at a certain position to the edge,
A so-called fixed position heating method is generally used.

[0004]

By the way, in recent years, FIG.
As shown in₁Of the leading steel strip 11 and the strip width W
₂Connect the tip of the following billet 12 at the connection point 13
The number of rolling cases is increasing. Such billets (below
Lower, different width connecting steel piece) 1A uses heating devices 2 and 2
When heating the plate width direction end portions 1a, 1a,
Position L of the center point 2a of the heat part, 2a from the end of the steel piece₀Contact
According to the progress of the continuation point 13 to the heating devices 2 and 2,
The temperature rise of the widthwise ends 1a, 1a is followed by the preceding steel strip 11
The amount of penetration of the heating devices 2 and 2 so that the billet 12 is optimal.
L₀So-called variable position addition
It is necessary to use the thermal method.

This is because the approach amount L ₀ for obtaining the optimum temperature rise is usually constant irrespective of the strip width, and therefore, in the case of the preceding billet 11 and the case of the trailing billet 12. This is for avoiding an optimal temperature rise in either one unless the heating positions of the heating devices 2 and 2 are changed. However, in the conventional hot rolling line, the so-called batch-position heating method for so-called batch material in which each steel piece is individually rolled is the mainstream, and the variable-position heating method suitable for different-width connecting steel pieces. Therefore, there was no technique for optimally heating and heating the ends of the preceding steel piece 11 and the following steel piece 12 in the plate width direction.

It is an object of the present invention to provide a positioning device for a heating device for steel strips of different width which solves the problems of the prior art.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a variable width connection in which a trailing end portion of a preceding steel slab and a leading end portion of a trailing steel slab having a plate width different from that of the preceding steel slab are continuously rolled. In the positioning device of the heating device for heating the plate width direction end of the steel strip, a transport speed detection means for detecting the transport speed of the different width connection steel strip,
A connection point detection means for detecting a connection point of the different width connection steel pieces, a heating device moving means for moving the heating device in the plate width direction, and a moving speed of the heating device moved by the heating device moving means, Heating device positioning control for controlling the heating device moving means by determining the heating position in the plate width direction of the heating device from the conveyance speed of the different width connecting steel pieces and the plate width difference between the preceding steel piece and the following steel piece And a positioning device for a heating device for connecting steel strips of different widths.

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

[0009]

[Operation] According to the present invention, the penetration amount of the heating device is determined by using the speed signal of the different width connecting steel strip, the detection signal of the connection point of the different width connecting steel strip, and the moving speed signal of the heating device moving means. Since it is decided, the heating position from the end in the strip width direction can be optimally determined for both the leading steel strip and the trailing steel strip in the different width connection steel strip, and by this, the end portion in the strip width direction can be determined. It is possible to suppress the generation of a low temperature part that occurs in the above.

[0010]

Embodiments of the present invention will be described in detail below 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 designated by the same reference numerals. In the figure, 3 is a heating device moving device, such as a hydraulic cylinder, which allows the heating device 2 to move in the plate width direction of the different width connecting steel strip 1A, and 4 is a different width connecting steel strip 1A.
A conveying speed detector, such as a pulse transmitter, for detecting the conveying speed of the wire, 5 is a connecting point detector, such as a plate width gauge, for detecting the connecting point 13 of the different width connecting steel strip 1A, and 6 is the heating device 2. , 2 is a heating device positioning control device that determines the heating position in the plate width direction.

Therefore, in the heating device positioning control device 6, the preceding billet 11 and the trailing billet 12 of the different width connecting billet 1A are provided.
Plate widths W ₁ and W ₂ of the sheet are inputted, and the conveying speed of the different width connecting steel strip 1A is inputted from the conveying speed detector 4,
The following processing is performed. Now, as shown in FIG. 2, it is assumed that the different width connecting steel strip 1A is conveyed in the direction of the arrow F, and the preceding steel strip 11 enters the heating devices 2 and 2 (the heating position HL from the end portion). the distance) to ₁ and L _1, the succeeding steel piece
If the approach amount at 12 (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 which must move the heating device 2 at the connection point 13 is as follows.
It is calculated by the 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 When the maximum moving speed is v _S , the time t ₁ required to traverse the moving distance L _S can be 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) Then, at the timing when the connection point 13 passes through the heating device 2, for example, it moves by a stroke of exactly 1/2 of the moving 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 Supplementing the reason why it is set to 1/2 of the above, when there is no significant difference in the strip width between the preceding billet 11 and the following billet 12 (for example, less than 100 mm), the different width connecting billet 1A before the coiler after finish rolling is used. It is based on the idea that it is appropriate to make the preceding strip 11 and trailing billet 12 have the same crop width. When the difference between the two is 100 mm or more, for example, it is preferable from the standpoint of product yield to position so that the sum of the areas of both non-heated parts is minimized.

Next, assuming that the maximum conveying speed of the different width connecting steel strip 1A is v _M , the heating device 2 is turned on when the connection point 13 reaches the point of the upstream side distance x ₁ from the position A of the heating device 2. It is sufficient to start the traverse and stop the movement at the point B after the lapse of time t ₁ . The distance x _{1 at} that time is calculated by the following equation (4). x ₁ = v _M · t ₂ (4) Note that this distance x ₁ is the connection point detector 5 at the connection point 13 when the distance between the connection point detector 5 and the heating device 2 is L _3. It can be said that the progress amount L _x from L is the timing at which L _x = L ₃ −x ₁ (5).

Further, since the moving speed of the different width connecting steel strip 1A may change after the start of the movement, in that case, the moving amount L ₄ after the start of the movement from the point A to the point C at the connection point 13 is calculated. The heating position of the heating device 2 may be determined by the formula (6) below. L ₄ = (v _S / v _M ) ・ (L ₃ −L _x ) ... (6) Then, as the different width connecting steel piece 1 A, the plate width W ₁ of the preceding steel piece 11 is 1200 mm, and the trailing steel is In the actual operation with the plate width W ₂ of the strip 12 of 1300 mm connected, the maximum conveying speed v
_M : Maximum transport speed v _S ; 200m when transported at 100mpm
Using the heating device 2 of m / sec, the amount of entry L ₁ from the end of the preceding steel piece 11; 100 mm, the amount of entry L ₂ from the end of the trailing steel piece 12; 100 mm, the connection point was detected. Under the condition that the distance L ₃ between the container 5 and the heating device 2 is 4000 mm, the steel strip 1 with different width is connected.
Edge heating of A was performed.

As a result, in both the preceding steel piece 11 and the following steel piece 12, the lengths of the non-heated portions at the rear end and the front end can be set to about 210 mm and about 210 mm, respectively, which are substantially the same value. It was possible to suppress the temperature difference between the end portions in the plate width direction and the central portion within about 30 ° C and within about 30 ° C, respectively. In the above example, the case where the strip width of the trailing steel strip 12 is wider than the strip width of the preceding steel strip 11 has been described as an example.
Needless to say, the present invention is not limited to this, and can be applied in the same manner even when the strip width of the trailing steel strip 12 is narrower than the strip width of the preceding steel strip 11.

[0017]

As described above, according to the present invention,
Since it has been made possible to optimally determine the heating position from the edge in the width direction of both the leading and trailing steel strips in the different width connection steel strip, It is possible to suppress the generation and contribute to the improvement of product quality and yield.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of an exemplary 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 diagram of different-width connecting steel pieces.

[Explanation of symbols]

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

Claims (2)

[Claims] 1. An end portion in the plate width direction of a different-width connecting steel piece that is continuously rolled by connecting a rear end portion of the preceding steel piece and a leading end portion of a following steel piece having a plate width different from that of the preceding steel piece. In a positioning device of a heating device for heating, a conveying speed detecting means for detecting a conveying speed of the different width connecting steel strip, a connection point detecting means for detecting a connecting point of the different width connecting steel strip, and the heating device. A heating device moving unit that moves in the plate width direction, a moving speed of the heating device that is moved by the heating device moving unit, a conveyance speed of a steel strip of different width, and a plate width difference between a preceding steel strip and a following steel strip. And a heating device positioning control means for determining the heating position of the heating device in the plate width direction and controlling the heating device moving means. 2. The different width connecting steel according to claim 1, wherein the moving position of the heating device by the heating device positioning control means is set to a half of the plate width difference when the connecting point passes. Positioning device for piece heating device.