JP2738246B2 - Rolling method of rolling mill with tandem arrangement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method capable of further improving the rolling efficiency in a tandem rolling plant having a plurality of rolling mills arranged in series.

[0002]

2. Description of the Related Art Generally, in rolling a shaped steel or a thick plate, a rolled material is reciprocally rolled a plurality of times by a single rolling mill to form a predetermined size. That is, the rolling mill and the front and rear table rollers used for rolling section steel, thick plate, etc. have a structure capable of normal and reverse operation, and in such equipment, the normal rotation and reverse rotation are sequentially performed for each rolling pass. And reciprocating rolling is usually performed for more than ten passes.

In recent years, in order to improve the dimensional accuracy of the rolled material and increase the size type, another tandem rolling mill is arranged on the line in addition to the existing rolling mill, and the above rolling is performed. Rolling is often performed. That is, FIG. 2 (a) is an explanatory view showing a tandem arrangement rolling equipment. To explain with reference to FIG. By reverse rotation, the rolled material 4 is reciprocated between the two rolling mills 1 and 2 for rolling.

In such a tandem arrangement rolling equipment, when the leading end of the rolled material 4 bites into the rolling mills 1 and 2, it is necessary to reduce the rolling speed to a certain speed or less, that is, a so-called biting speed. . This is the rolled material 4 during rolling.
The tip of the rolled material 4 is in the shape of a trough with upward and downward warping. And
The rolled material becomes a loop between the rolling mills 1 and 2, and the rolled material 4
This may result in defective products or damage to the rolling equipment.

[0005] Therefore, the rolling speed pattern at the tip of the rolled material of the tandem rolling equipment shown in FIG. 2 (a) indicates that the rolled material 4 is bitten into the rolling mill 1 as shown in FIG. From immediately before to the next rolling mill 2 biting, the rolling speed is controlled to the biting speed, and the rolling speed is accelerated to the maximum rolling speed immediately after the biting of the rolling mill 2 is completed. As shown in c), the rolling speed is controlled to the biting speed from immediately before the rolled material 4 is bitten into the rolling mill 2 to the biting of the next rolling mill 1, and immediately after the biting of the rolling mill 2 is completed. , And accelerates to the maximum rolling speed, which is also disclosed, for example, in JP-A-52-84153.

[0006]

As described above, in the conventional tandem rolling equipment, the leading end of the rolled material 4 is reduced by the rolling mills 1 and 2.
The rolling speed was controlled to a low biting speed during the interval between the rolling mills. However, in equipment where the distance between the rolling mills 1 and 2 is 10 m or more, extra rolling is required until proper rolling is performed due to the low rolling speed. The problem that it takes time takes place.

As a result, the entire rolling time in the tandem rolling equipment increases, and not only does the overall production decrease, but also the temperature of the hot-rolled material decreases due to the extra time, and the rolled material is reduced. There is a possibility that the rolling itself becomes impossible and the rolling itself becomes impossible. In particular, when rolling is performed for ten or more passes, the above-mentioned time increase occurs for each pass, so that the rolling efficiency is greatly affected.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a rolling method capable of shortening the rolling time of tandem rolling and improving the rolling efficiency.

[0009]

SUMMARY OF THE INVENTION Therefore, the present invention provides
Reciprocating rolled material between multiple rolling mills
In the rolling method of rolling, the tip of the rolled material bites into the rolling mill.
From when it is inserted into the next rolling mill,
The end of the rolled material bites into the rolling mill located at the end of the one-way process.
And after that incorporated seen, it is an essential feature and this <br/> rolling and accelerated to full speed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following examples.

FIG. 1 (a) is a tandem arrangement rolling line diagram showing an example of an apparatus configuration for specifically implementing the method of the present invention.
1, 2 is a rolling mill, 3 is a table roller, 4 is a rolled material, 8
Is a motor, and the rolling cells 1 and 2 have a load cell 5
A photoelectric sensor 6 is disposed immediately behind the rolling mill 1 and immediately before the rolling mill 2, respectively.
A control device for controlling the motors 8a to 8e of the rolling mills 1 and 2 and the table roller 3 based on a signal from the sensor 6 is provided.

In such an apparatus configuration, the rolled material 4 is
The process of reciprocating back and forth multiple times including between rolling mills 1 and 2
You. Outbound is rolling mill 1 and rolling mill 2 in order, return is rolling mill
2. Rolling is performed in the order of the rolling mill 1. Figure 1 shows the pressure in one process
FIG. 3B shows a forward pattern as viewed from the position of the leading end of the rolled material, and FIG. 3C shows a pattern of the return path as viewed from the position of the leading end of the rolled material.

First, on the outward path, immediately before the leading end of the rolled material 4 is bitten into the rolling mill 1, the control device 7 controls the rotation speed of the motors 8a and 8b so that the rolling speed becomes the biting speed.

When the leading end of the rolled material 4 is bitten into the rolling mill 1, the load cell 5a detects the bite as a load value and sends a signal to the control device 7. The control device 7 controls the motors 8a, 8b, 8c to increase the number of revolutions by inputting the signal, and accelerates the rolling speed to the maximum speed at a stretch.

When the leading end of the rolled material 4 approaches just before the rolling mill 2, the signal is detected by the sensor 5b and the signal is sent to the control device 7. By inputting the signal, the control device 7 controls the motor 8
Control is performed so that the rotation speeds of a, 8b, and 8c are reduced, and the rolling speed is reduced until the rolling speed reaches the biting speed before the leading end of the rolled material 4 bites into the rolling mill 2.

When the leading end of the rolled material 4 is bitten into the rolling mill 2, the load cell 5b detects the bite as a load value, and a signal is sent to the control unit 7, and the control unit 7 receives the signal and inputs the signal. 7 is the same as when biting the rolling mill 1
The rotation speed of the motors 8a to 8e is controlled to be increased, and the rolling speed is accelerated to the maximum speed at a stretch. Hereinafter, the speed is maintained until the motors 8a to 8e are reversed.

Next, on the return path, immediately before the other end of the rolled material 4 is bitten into the rolling mill 2, the control device 7 controls the motor 8e.
Is controlled so that the rolling speed becomes the biting speed.

When the other end of the rolled material 4 is bitten into the rolling mill 2, the load cell 5b detects the bite as a load value, and a signal is sent to the control device 7. The control device 7 controls the motors 8c, 8d, and 8e to increase the number of revolutions by inputting the signal, and accelerates the rolling speed to the maximum speed at a stretch.

When the other end of the rolled material 4 approaches just before the rolling mill 1, the signal is detected by a sensor 5 a and sent to the control device 7. The control device 7
Controls the number of rotations of the motors 8b, 8c, 8d, 8e to be low, and reduces the rolling speed to the biting speed before the other end of the rolled material 4 bites into the rolling mill 1. .

When the other end of the rolled material 4 is bitten into the rolling mill 1, the bite is detected by the load cell 5a as a load value, and a signal is sent to the control device 7, and the signal is sent to the control device 7 to input the signal. The control device 7 controls the motors 8a to 8a as described above.
The control is performed to increase the rotation speed of 8e, and the rolling speed is accelerated to the maximum speed at a stretch. Hereinafter, the speed is maintained until the motors 8a to 8e are reversed.

As described above, in the rolling method of this embodiment,
When the tip of the rolled material 4 passes between the rolling mills 1 and 2 ,
The rolling mill located at the end of the road process (2 on the outbound route, 2 on the return route)
Since the rolling speed is accelerated to the maximum speed at a stretch after the tip of the rolled material 4 is bitten in 1), the rolling is performed at the maximum speed, and the time required for the process of accelerating to the maximum speed and the rolling time are compared with the conventional one. It can be shortened by performing multiple steps.
As a result, the entire rolling time can be shortened, the rolling efficiency can be improved, and the risk of hot rolling hindrance due to a decrease in temperature can be completely eliminated.

Next, a test was conducted to improve the rolling efficiency of the above-described embodiment, which will be described.

Under the following conditions, the H-section steel was tandem-rolled. For comparison, FIG.
(b) The conventional method shown in (c) was also used. Distance between rolling mills: 16 m Size after rolling: 400 × 150 to 900 × 300 Number of passes: 10 Maximum rolling speed: 400 × 150 ・ ・ ・ 7.60 m / s 900 × 300 ・ ・ ・ 8.25 m / s Reduction amount : Max 2mm pass line: Roller sky FL + 900mm

As a result, in the conventional method, the total rolling time is about 90
In this embodiment, the rolling time is about 77 seconds, the rolling time is reduced by 13 seconds, and the rolling efficiency is 14 seconds.
% Improved. Also, regarding the temperature drop of the rolled material (assuming that the average temperature drops by 1.5 ° C./sec), the reduction of 19.5 ° C. can be prevented by shortening 13 seconds. Further, the yield was improved by about 9%.

As described above, according to the rolling method of the tandem-arranged rolling mill according to the present invention, the rolling when the leading end of the rolled material passes between one rolling mill and the next rolling mill is performed. Since the rolling speed is increased at a stretch to the maximum speed, the rolling time at the time of passing can be reduced as compared with the conventional one, and the overall rolling time can be reduced, and the rolling efficiency is improved. At the same time, there is no danger of the hot rolling being hindered by the temperature drop.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an example of a configuration for implementing the method of the present invention, in which (a) is a tandem arrangement rolling line diagram, (b) is a forward rolling speed pattern diagram, and (c) is a returning rolling speed pattern. FIG.

2A is a conventional tandem arrangement rolling line diagram, FIG. 2B is a forward rolling speed pattern diagram, and FIG. 2C is a returning rolling speed pattern diagram.

[Explanation of symbols]

 1, 2 rolling mill 3 table roller 4 rolled material 5 load cell 6 photoelectric sensor 7 control device 8 motor

Claims (2)

(57) [Claims] A pressure between a plurality of rolling mills arranged in tandem.
In the rolling method of rolling the rolled material back and forth, the rolling mill
After the end of the rolled material is bitten, it bites into the next rolling mill
To the rolling mill at the end of the one-way process
After the tip of the rolled material has been bitten,
Tandem arrayed pressure characterized by rapid rolling
Rolling method of rolling mill. 2. A rolling method for a rolling mill in a tandem arrangement according to claim 1, wherein a sensor for detecting a position of a leading end of the rolled material is arranged on a rolling line, and the control device controls the rolling device based on a signal from the sensor. 2. The method of claim 1, wherein the speed is automatically controlled.