KR101225740B1 - Method for preventing camber of roll mill - Google Patents

Method for preventing camber of roll mill Download PDF

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KR101225740B1
KR101225740B1 KR20100136330A KR20100136330A KR101225740B1 KR 101225740 B1 KR101225740 B1 KR 101225740B1 KR 20100136330 A KR20100136330 A KR 20100136330A KR 20100136330 A KR20100136330 A KR 20100136330A KR 101225740 B1 KR101225740 B1 KR 101225740B1
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rolling
roll gap
rolling mill
deviation
roll
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KR20100136330A
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KR20120074479A (en
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정병완
신철식
박석의
정종일
최종현
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현대제철 주식회사
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Abstract

The present invention includes the steps of sensing the roll gap of the left and right of the rolling mill, calculating the roll gap deviation of the left and right of the rolling mill through the roll gap of the left and right of the rolling mill and controlling the rolling mill according to the roll gap deviation It features.

Figure R1020100136330

Description

Method for preventing rolling malfunction of rolling mill {Method for preventing camber of roll mill}

The present invention relates to a rolling mill, and more particularly to a rolling malfunction prevention method of a rolling mill to prevent rolling malfunction by monitoring the left and right deviation of the rolling mill.

In general, in a mill for rolling steel sheets, a plurality of passes are performed until the thickness of the slab reaches the rolling target thickness.

To this end, a roll gap to be rolled for each pass is set. When setting the roll gap, the roll gap is precisely controlled by using a screw down, which is an electric pressure reduction device, and then by using a hydraulic cylinder, which is a hydraulic pressure reduction device.

When the roll gap setting is completed, the rolling material is inserted into the rolling rolls to proceed with rolling.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

It is an object of the present invention to provide a rolling malfunction prevention method of a rolling mill to prevent equipment accidents by monitoring left and right roll gaps and left and right rolling loads of a rolling mill in real time.

Rolling malfunction prevention method of the rolling mill according to an aspect of the present invention comprises the steps of sensing the roll gap of the left and right of the rolling mill; Calculating roll gap deviations of the left and right sides of the rolling mill through the roll gaps of the left and right sides of the rolling mill; And controlling the rolling mill according to the roll gap deviation.

In the present invention, controlling the rolling mill is characterized in that the rolling mill is opened if the roll gap deviation is equal to or greater than a first roll gap reference value.

In the present invention, the controlling of the rolling mill may further include warning a deviation error of the rolling mill when the roll gap deviation is equal to or greater than a first roll gap reference value.

In the present invention, if the roll gap deviation is greater than or equal to the second roll gap reference value, further comprising the step of warning the deviation error of the rolling mill.

Detecting a rolling load on the left side and the right side of the rolling mill according to another aspect of the present invention; Calculating rolling load deviations of the left and right sides of the rolling mill based on the left and right rolling loads of the rolling mill; And controlling the rolling mill according to the rolling load deviation.

In the present invention, the step of controlling the rolling mill is characterized in that the rolling mill is opened if the rolling load deviation is greater than or equal to the first rolling load reference value.

In the present invention, the step of controlling the rolling mill further comprises a step of warning a rolling load error of the rolling mill when the rolling load deviation is greater than or equal to a first rolling load reference value.

In the present invention, if the rolling load deviation is more than the second rolling load reference value, characterized in that it further comprises the step of warning the rolling load error of the rolling mill.

The present invention monitors the left and right roll gap of the rolling mill and the left and right rolling load in real time to prevent equipment accidents that damage the peripheral equipment while the rolled material is twisted in the rolling mill or exits the rolling mill due to the rolling malfunction of the rolling mill.

1 is a block diagram of a rolling malfunction prevention device of a rolling mill according to an embodiment of the present invention.
Figure 2 is a flow chart of the rolling malfunction prevention method of the rolling mill according to an embodiment of the present invention.

Hereinafter, a rolling malfunction prevention method of a rolling mill according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

The rolling malfunction prevention method of the rolling mill of this invention detects the roll gap or rolling load of the left side and the right side of a rolling mill, and controls a rolling mill according to a roll gap or a rolling load deviation.

In this case, the rolling mill is opened or an error is warned according to the comparison result compared with the reference values respectively set in the roll gap or the rolling load.

1 is a block diagram of a rolling malfunction prevention device of a rolling mill according to an embodiment of the present invention.

Rolling malfunction prevention apparatus of the rolling mill according to an embodiment of the present invention includes a roll gap adjusting unit (300, 400) and position detectors (302a, 302b), the control unit 200, the rolling load detection unit 500 and the warning unit 600.

The rolling mill 100 supports the upper work roll 101a and the lower work roll 101b and the upper work roll 101a and the lower work roll 101b for rolling the rolled material in the upper and lower portions, respectively. The support roll 102a and the lower support roll 102b are provided.

Therefore, the upper working roll 101a and the lower working roll 101b are rolled while passing the rolling material supported by the upper supporting roll 102a and the lower supporting roll 102b, respectively.

The roll gap adjusting unit 300 and 400 includes an electric roll gap adjusting unit 300 and a hydraulic roll gap adjusting unit 400.

The electric roll gap adjusting unit 300 has a left pressing screw 301b and a right pressing screw 301a according to the positions of the left pressing screw 301a and the right pressing screw 301b inputted from the pressing screw position detectors 302a and 302b. Control the roll gap 20 between the upper work roll 101a and the lower work roll 101b.

The push-down screw position detectors 302a and 302b use the left push-down screw position detector 302b for detecting the position of the left push-down screw 301b and the right push-down screw position detector 302a for detecting the position of the right push-down screw 301b. Equipped.

The push down screws 301a and 301b include a left push down screw 301b for moving down the left side of the upper support roll 101a and a right push down screw 301a for moving down the right side.

That is, the electric roll gap adjusting unit 300 is the left pressing screw position detector 302b and the right pressing screw position detector 302a, when the positions of the left pressing screw 301b and the right pressing screw 301a are input, respectively, the left pressing screw The roll gap 20 between the upper work roll 101a and the lower work roll 101b is adjusted by moving 301b and the right pressing screw 301a.

In this case, the electric roll gap adjusting unit 300 controls the position of the left pressing screw 301b and the position of the right pressing screw 301a input from the left pressing screw position detector 302b and the right pressing screw position detector 302a. 600) in real time.

The hydraulic roll gap adjusting unit 400 moves the lower support roll 102b up and down. Through this, the roll gap 20 between the upper work roll 101a and the lower work roll 101b controlled by the electric roll gap adjusting part 300 is further finely adjusted to improve the accuracy of the roll gap 20. .

The hydraulic roll gap adjusting unit 400 controls the hydraulic cylinders 401a and 401b according to the positions of the hydraulic cylinders detected by the hydraulic cylinder position detectors 402a and 402b.

The hydraulic cylinders 401a and 401b include a left hydraulic cylinder 401b for moving the left side of the lower support roll 102b and a right hydraulic cylinder 401a for moving the right side of the lower support roll 102b.

The hydraulic cylinder position detectors 402a and 402b use the left hydraulic cylinder position detector 402b for detecting the position of the left hydraulic cylinder 401b and the right hydraulic cylinder position detector 402a for detecting the position of the right hydraulic cylinder 401a. Equipped.

The hydraulic roll gap adjusting unit 400 is a left hydraulic cylinder 401b according to the positions of the left hydraulic cylinder 401b and the right hydraulic cylinder 401b inputted from the left hydraulic cylinder position detector 402b and the right hydraulic cylinder position detector 402a. And the right hydraulic cylinder 401b to adjust the roll gap 20 between the upper work roll 101a and the lower work roll 101b.

On the other hand, the hydraulic roll gap adjustment unit 400 controls the position of the left hydraulic cylinder 401b and the position of the right hydraulic cylinder 401a input from the left hydraulic cylinder position detector 402b and the right hydraulic cylinder position detector 402a. In real time.

The rolling load detection unit 500 inputs the rolling load detected by the rolling load detectors 501a and 501b during rolling into the control unit 200.

The rolling load detectors 501b and 501a include a left rolling load detector 501b and a right rolling load detector 501a.

For reference, in the above-described embodiment, calculating the roll gap using the position of the left pressing screw 301b or the right pressing screw 301a or using the position of the left hydraulic cylinder 401b or the right hydraulic cylinder 401a. Although described by way of example, the technical scope of the present invention will encompass all ways in which a roll gap can be obtained.

For example, by detecting a position change of the upper work roll 101a and the lower support roll 101b by using an imaging camera (not shown) or the like, or estimating the roll gap by measuring the thickness of the rolled material after rolling. It may be included.

The left rolling load detector 501b is installed on the left side of the upper support roll 102a to detect the rolling load acting on the left side of the upper support roll 102a, and the right rolling load detector 501a is the upper support roll 102a. The rolling load acting on the right side of the upper support roll 102a is installed on the right side.

The warning unit 600 warns of a roll gap error or a rolling load error. The warning unit 600 outputs a warning sound, or outputs an image or flashes the lamp so that the driving manager or the driver can visually check.

The control unit 200 is a position of the left pressing screw position 301b and the right pressing screw 301a input from the electric roll gap adjusting unit 300, the left hydraulic cylinder 401b and the right hydraulic cylinder input from the hydraulic roll gap adjusting unit 400. The roll gap deviation is checked through the position of 401a.

Thereafter, the roll gap deviation is compared with the first roll gap reference value and the second roll gap reference value, and the lower support roll 102b is moved through the hydraulic roll gap adjusting unit 400 according to the comparison result, so that the upper work roll 102a and the lower work roll ( Opening 102b or controlling the warning unit 600 to warn the roll gap error.

In addition, by comparing the left rolling load and the right rolling load input from the rolling load detection unit 500 to check the rolling load deviation.

Thereafter, the roll gap deviation is compared with the first rolling load reference value and the second rolling load reference value to move the lower supporting roll 102b through the hydraulic roll gap adjusting unit 400 according to the comparison result, so that the upper work roll 102a and the lower work roll Opening 102b or controlling warning unit 600 to warn of roll gap errors.

Hereinafter, a rolling malfunction prevention method of a rolling mill according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

Figure 2 is a flow chart of the rolling malfunction prevention method of the rolling mill according to an embodiment of the present invention.

First, when the rolling is started, the control unit 200 transmits a roll gap indication value to the electric roll gap adjusting unit 300 and the hydraulic roll gap adjusting unit 400 (S10).

The electric roll gap adjusting unit 300 receives the positions of the left and right pressing screws 301b and 301a inputted from the left pressing screw position detector 302b and the right pressing screw position detector 302a according to the roll gap indication value, while the left pressing screw ( 301b and the right side down screw 301a are driven.

In addition, the hydraulic roll gap adjusting unit 400 receives the positions of the left and right hydraulic cylinders 401b and 401a inputted from the left hydraulic cylinder position detector 402b and the right hydraulic cylinder position detector 402a according to the roll gap indication value. The cylinder 401b and the right hydraulic cylinder 401a are driven.

Through this process, the roll gap between the upper work roll 101a and the lower work roll 101b is adjusted to the roll gap indication value (S20).

Thereafter, rolling is started while passing the rolled material.

In this process, the positions of the left and right pressure reducing screws 301b and 301a are received from the electric roll gap adjusting unit 300, and the positions of the left and right hydraulic cylinders 401b and 401a are received from the hydraulic roll gap adjusting unit 400. Calculate the deviation.

At this time, it is determined whether the roll gap deviation is greater than or equal to the first roll gap reference value (S30), and if the roll gap deviation is greater than or equal to the first roll gap reference value, the hydraulic roll gap adjustment unit 400 is controlled to move the lower support roll 102b downward to move the upper work roll. Open 102a and lower work roll 102b. In addition, the warning unit 600 is controlled to warn the roll gap error (S32).

On the other hand, if the roll gap deviation is not equal to or greater than the first roll gap reference value, it is determined whether the roll gap deviation is greater than or equal to the second roll gap reference value (S40), and if the roll gap deviation is greater than or equal to the second roll gap reference value, the warning unit 600 controls the roll gap error. Warning (S42).

Here, the second roll gap reference value is a maximum value within a range in which the positional change of the left and right pressure reducing screws 301b and 301a and the positional change of the left and right hydraulic cylinders 401b and 401a are normally allowed. It is a standard that can be judged to have occurred or is likely to be generated, and it is a standard to warn the equipment operator.

The first roll gap reference value is a value exceeding the second roll gap reference value and is a reference value that can be judged that the rolling material causes rolling malfunction and equipment accident due to severe camber during rolling, and the upper work roll 102a and the lower work roll ( 102b) is a value used as a reference for opening.

On the other hand, the controller 200 calculates the rolling load deviation when the left and right rolling loads input from the rolling load detection unit 500 are input.

At this time, it is determined whether the rolling load deviation is greater than or equal to the first rolling load reference value (S50), and if the rolling load deviation is greater than or equal to the first rolling load reference value, the hydraulic roll gap adjusting unit 400 is controlled to control the upper work roll 102a and the lower work roll. Opening the 102b, and warns the rolling load error through the warning unit 600 (S52).

On the other hand, if the rolling load deviation is not equal to or greater than the first rolling load reference value, it is determined whether the rolling load deviation is greater than or equal to the second rolling load reference value (S60). Warning (S62).

Here, the second rolling load reference value is the maximum value of the range in which the rolling loads acting on the left and right rolling screws 301b and 301a are generally allowed, and the rolled material is likely to cause camber during rolling or is partially generated. It is a standard that can be judged, and it is a standard to warn the equipment operator.

The first rolling load reference value is a value exceeding the second rolling load reference value and is a reference value that can be judged that the rolling material causes rolling malfunction and equipment accident due to severe camber during rolling, and the upper work roll 102a and the lower work It is a value used as a reference for opening the roll 102b.

Meanwhile, a method of calculating the first roll gap reference value, the second roll gap reference value, the first rolling load reference value, and the second rolling load reference value will be described.

However, the first roll gap reference value, the second roll gap reference value, the first rolling load reference value, and the second rolling load reference value are not limited to the following calculation method, and may be variously set according to the experience value of the equipment operator or the equipment manager.

The first roll gap reference value Eme_Mec_Dev for the positional deviation of the left and right pressing screws 301b and 301a is calculated using Equation 1 below.

Figure 112010086602018-pat00001

Here, Avg_Mec_Dev is an average value for the left and right push down screw position deviations in the past, Sig_Mec_Dev is a standard deviation for the left and right push down screw position deviations in the past, and S1 is a weight for the first standard deviation.

The weight S1 for the first standard deviation varies depending on the equipment and operating conditions of each plant, but approximately 3.0 or more is appropriate.

Meanwhile, the first roll gap reference value Eme_Hyd_Dev for the positional deviations of the left and right hydraulic cylinders 401b and 401a is calculated by using Equation 2 below.

Figure 112010086602018-pat00002

Here, Avg_Hyd_Dev is an average value for the left and right hydraulic cylinder position deviations in the past, Sig_Hyd_Dev is a standard deviation for the left and right hydraulic cylinder position deviations in the past, and S1 is a weight for the first standard deviation.

The weight S1 for the first standard deviation varies depending on the equipment and operating conditions of each plant, but approximately 3.0 or more is appropriate.

On the other hand, the first rolling load reference value (Eme_For_Dev) for the left and right rolling load deviation is calculated using the following equation (3).

Figure 112010086602018-pat00003

Here, Avg_For_Dev is an average value of the past left and right rolling load deviations, Sig_For_Dev is a standard deviation of the past left and right rolling load deviations, and S1 is a weight for the first standard deviation.

The weight S1 for the first standard deviation varies depending on the equipment and operating conditions of each plant, but approximately 3.0 or more is appropriate.

Next, the second roll gap reference value Nor_Mec_Dev for the positional deviation of the left and right pressing screws 301b and 301a is calculated using Equation 4 below.

Figure 112010086602018-pat00004

Here, Avg_Mec_Dev is the mean of the past left and right pressing screw deviation, Sig_Mec_Dev is the standard deviation of the past left and right pressing screw deviation, S2 is the weight for the second standard deviation, S2 is the second standard deviation. Is the weight for.

The weight (S2) for the second standard deviation depends on the equipment and operating conditions of each plant, but approximately 2.5 to 3.0 is appropriate.

The second roll gap reference value Nor_Hyd_Dev for the positional deviations of the left and right hydraulic cylinders 401b and 401a is calculated using Equation 5 below.

Figure 112010086602018-pat00005

Here, Avg_Hyd_Dev is an average value of the left and right hydraulic cylinder position deviations in the past, Sig_Hyd_Dev is a standard deviation of the left and right hydraulic cylinder position deviations in the past, S2 is a weight for the second standard deviation.

The weight (S2) for the second standard deviation depends on the equipment and operating conditions of each plant, but approximately 2.5 to 3.0 is appropriate.

The first rolling load reference value Nor_For_Dev for the left and right rolling load deviations is calculated using Equation 6 below.

Figure 112010086602018-pat00006

Here, Avg_For_Dev is an average value for the left and right rolling load deviations in the past, Sig_For_Dev is a standard deviation for the left and right rolling load deviations in the past, and S2 is a weight for the second standard deviation.

The weight (S2) for the second standard deviation depends on the equipment and operating conditions of each plant, but approximately 2.5 to 3.0 is appropriate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

20: roll gap 101a: upper work roll
101b: lower work roll 102a: upper support roll
102b: lower support roll 200: fisherman
300: electric roll gap adjusting unit 301b: left-hand pressing screw
301a: right side down screw 302b: left side down screw position detector
302a: right pressure screw position detector 400: hydraulic roll gap adjustment unit
401b: left hydraulic cylinder 401a: right hydraulic cylinder
402b: Left hydraulic cylinder position detector 402a: Right hydraulic cylinder position detector
500: rolling load detection unit 501b: left rolling load detector
501a: right rolling load detector 600: warning part

Claims (8)

Sensing roll gaps on the left and right sides of the rolling mill;
Calculating roll gap deviations of the left and right sides of the rolling mill through the roll gaps of the left and right sides of the rolling mill; And
Controlling the rolling mill according to the roll gap deviation,
The controlling of the rolling mill may include opening the rolling mill if the roll gap deviation is equal to or greater than a first roll gap reference value. delete The method of claim 1, wherein controlling the rolling mill
If the roll gap deviation is equal to or greater than the first roll gap reference value, warning the deviation error of the rolling mill, further comprising: preventing a rolling malfunction of the rolling mill. The method of claim 1, further comprising a step of warning a deviation error of the rolling mill if the roll gap deviation is equal to or greater than a second roll gap reference value. Sensing rolling loads on the left and right sides of the rolling mill;
Calculating rolling load deviations of the left and right sides of the rolling mill based on the left and right rolling loads of the rolling mill; And
Including the step of controlling the rolling mill in accordance with the rolling load deviation,
The step of controlling the rolling mill is to prevent the rolling malfunction of the rolling mill, wherein the rolling mill is opened when the rolling load deviation is equal to or greater than a first rolling load reference value. delete The method of claim 5, wherein controlling the rolling mill
If the rolling load deviation is greater than or equal to the first rolling load reference value, warning the rolling load error of the rolling mill, further comprising: preventing a rolling malfunction of the rolling mill. 6. The method of claim 5, further comprising a step of warning a rolling load error of the rolling mill if the rolling load deviation is greater than or equal to a second rolling load reference value.
KR20100136330A 2010-12-28 2010-12-28 Method for preventing camber of roll mill KR101225740B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010035942A (en) * 1999-10-05 2001-05-07 이구택 Apparatus and method for automatically determining initial position of roll gap in plate mill

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010035942A (en) * 1999-10-05 2001-05-07 이구택 Apparatus and method for automatically determining initial position of roll gap in plate mill

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