A control method for preventing the side guide plate from clamping steel when hot-rolling thin-gauge coiling

Abstract

The present invention relates to a control method for preventing the side guides from clamping steel during hot-rolled thin coiling, and belongs to the technical field of metallurgical manufacturing methods. The technical solution of the present invention is: side guide calibration, calibration of standard opening and standard side guide pressure; real-time monitoring of the side guide opening and pressure feedback values, and comparison with the strip width, and the use of position control mode and pressure control mode to adjust the side guide opening width. The beneficial effects of the present invention are: timely correction of the problem of side guide clamping steel during coiling when the width of the strip head is greater than the side guide opening setting or there is a serious sickle bend and centerline offset at the strip head, while reducing the side guide clamping accident caused by the side guide frame affecting the opening accuracy, reducing coiling steel piling accidents, and achieving efficient and stable production, and improving the production capacity of the rolling mill.

Description

Technical Field

[0001] The invention relates to a control method for preventing a side guide plate from clamping steel when hot-rolling thin-gauge coiling, and belongs to the technical field of metallurgical manufacturing methods. Background Art

[0002] The coiler side guide is arranged in front of each coiler. It is used to center the strip and guide the strip into the pinch rollers to ensure that the end surface of the steel coil is flat.

[0003] The initial opening of the hot-rolling coiling side guide is set as the strip PDI target width + the short stroke setting value + the offset value. The short stroke setting value varies depending on the strip's width and thickness, generally ranging from 110mm to 130mm. The offset value varies depending on the strip's width and thickness, ranging from 15mm to 30mm. The first short stroke timing of the side guide is determined by the hot metal detector before the coiler's pinch rolls, and the second short stroke timing is determined by the coiler's bite.

[0004] During routine hot rolling production, especially for thin strip, the head is prone to head width overrun, head deviation, and camber. When the strip head width exceeds the side guide opening setting, or when the strip head exhibits severe camber and centerline deviation, the side guides can clamp the strip during short strokes, causing coiling and steel piling. Furthermore, due to equipment wear, the presence of rims on both sides of the side guides affects the opening accuracy, which can also easily lead to steel piling. These steel piling accidents not only reduce the yield rate but also increase process and time costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a control method for preventing the side guide plates from clamping steel when hot-rolling thin-gauge coiling. By real-time monitoring of the side guide plate opening and pressure feedback value and comparing them with the strip width, the method can promptly correct the problem of side guide plate clamping steel when the strip head width is greater than the side guide plate opening setting or there is a serious sickle bend and center line offset at the strip head. At the same time, it reduces the side guide plate clamping accident caused by the frame amount of the side guide plate affecting the opening accuracy, reduces the coiling steel piling accident, achieves efficient and stable production, improves the rolling mill capacity, and effectively solves the above-mentioned problems existing in the background technology.

[0006] The technical solution of the present invention is: a control method for preventing the side guide plate from pinching steel during hot rolling thin-gauge coiling, comprising the following steps:

[0007] (1) Calibration of the side guides: measure the actual opening of the side guides before production, calibrate the standard opening and standard side guide pressure, and open the side guides to the standard opening;

[0008] (2) When the strip passes through the hot metal detector in front of the coiling pinch roller, the side guide plate performs a short stroke and closes;

[0009] (3) When the strip enters the coiler and is stretched, the side guide plate performs a secondary short stroke closing and switches to the pressure control mode. The side guide plate continues to close until the standard side guide plate pressure is reached;

[0010] (4) When the side guide opening is less than the strip width and reaches the set value, but still does not reach the standard side guide pressure, the side guide stops closing, the control mode is switched to position control mode, and the side guide opening is locked at the strip width minus the set value;

[0011] (5) In the position control mode, when the side guide plate detection pressure reaches the set condition, the side guide plate will immediately increase the opening width and switch back to the pressure control mode to close the side guide plate;

[0012] (6) When the tail of the strip passes through the pinch roller, the rear guide plate opens to the standard opening.

[0013] In the step (1), the standard opening degree is that the actual opening degree of the side guide plate is greater than the feedback value of the magnetic scale of the side guide plate by 0-5 mm.

[0014] In the step (4), the setting value is 2 mm.

[0015] In the step (5), the setting condition is that the side guide plate detection pressure is greater than the standard side guide plate pressure by 3KN and lasts for 0.3 seconds.

[0016] In the step (5), the side guide plate increases the opening width and opens by 20 mm.

[0017] In the step (1), the side guide plate calibration should be performed when the working roll is repaired or replaced.

[0018] In the step (2), the speed of the strip on the cooling roller is in the range of 2.2-19 m / s, the applicable thickness specification is 1.2-25.4 mm, and the coiling temperature is 100-700°C.

[0019] The beneficial effects of the present invention are: by real-time monitoring of the side guide plate opening and pressure feedback value, and comparing them with the strip width, the problem of side guide plate clamping during coiling caused by the strip head width being greater than the side guide plate opening setting or the strip head having serious sickle bending and center line offset can be corrected in a timely manner; at the same time, the side guide plate clamping accident caused by the side guide plate frame affecting the opening accuracy is reduced, the coiling steel piling accident is reduced, efficient and stable production is achieved, and the rolling mill capacity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the invention implementation cases will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] A control method for preventing the side guide plate from pinching steel during hot-rolled thin-gauge coiling, comprising the following steps:

[0023] (1) Calibration of the side guides: measure the actual opening of the side guides before production, calibrate the standard opening and standard side guide pressure, and open the side guides to the standard opening;

[0024] (2) When the strip passes through the hot metal detector in front of the coiling pinch roller, the side guide plate performs a short stroke and closes;

[0025] (3) When the strip enters the coiler and is stretched, the side guide plate performs a secondary short stroke closing and switches to the pressure control mode. The side guide plate continues to close until the standard side guide plate pressure is reached;

[0026] (4) When the side guide opening is less than the strip width and reaches the set value, but still does not reach the standard side guide pressure, the side guide stops closing, the control mode is switched to position control mode, and the side guide opening is locked at the strip width minus the set value;

[0027] (5) In the position control mode, when the side guide plate detection pressure reaches the set condition, the side guide plate will immediately increase the opening width and switch back to the pressure control mode to close the side guide plate;

[0028] (6) When the tail of the strip passes through the pinch roller, the rear guide plate opens to the standard opening.

[0029] In the step (1), the standard opening degree is that the actual opening degree of the side guide plate is greater than the feedback value of the magnetic scale of the side guide plate by 0-5 mm.

[0030] In the step (4), the setting value is 2 mm.

[0031] In the step (5), the setting condition is that the side guide plate detection pressure is greater than the standard side guide plate pressure by 3KN and lasts for 0.3 seconds.

[0032] In the step (5), the side guide plate increases the opening width and opens by 20 mm.

[0033] In the step (1), the side guide plate calibration should be performed when the working roll is repaired or replaced.

[0034] In the step (2), the speed of the strip on the cooling roller is in the range of 2.2-19 m / s, the applicable thickness specification is 1.2-25.4 mm, and the coiling temperature is 100-700°C.

[0035] In practical application, the present invention includes the following steps and contents:

[0036] Step 1: Before production, measure and calibrate the actual opening of the side guide plate, so that the actual opening of the side guide plate is X mm larger than the feedback value of the side guide plate magnetic scale, and the X value is 0~5mm;

[0037] Step 2: When the strip passes the hot metal detector in front of the coiling pinch roller, the side guide plate performs a short stroke and closes;

[0038] Step 3: When the strip enters the coiler and is stretched, the side guide plate performs a secondary short stroke closing and switches to pressure control. The side guide plate continues to close until the set side guide plate pressure is reached;

[0039] Step 4: When the side guide opening is less than the strip width K mm but the set pressure has not been reached, the side guide stops closing and the control mode is switched to position control. The side guide opening is locked at the strip width - K mm, with the K value being 2 mm.

[0040] Step 5: In the position control mode, when the side guide plate detection pressure is greater than the set pressure of 3KN and lasts for 0.3 seconds, the side guide plate will immediately open 20mm and the pressure control will be re-activated to close the side guide plate;

[0041] Step 6: When the tail of the strip passes through the pinch roller, the rear guide plate opens to the set position.

[0042] The present invention monitors the side guide plate opening and pressure feedback value in real time and compares it with the strip width, thereby solving the problem of side guide plate clamping during coiling when the strip head width is greater than the side guide plate opening setting or there is serious sickle bending and center line offset at the strip head, and at the same time reduces the side guide plate clamping accident caused by the influence of the opening accuracy on the frame of the side guide plate, thereby reducing the coiling steel piling accident and improving the rolling mill production capacity.

Claims

1. A control method for preventing the side guide plate from clamping steel when hot-rolling thin-gauge coiling, characterized in that The following steps are involved: (1) Calibration of the side guides: measure the actual opening of the side guides before production, calibrate the standard opening and standard side guide pressure, and open the side guides to the standard opening; (2) When the strip passes through the hot metal detector in front of the coiling pinch roller, the side guide plate performs a short stroke and closes; (3) When the strip enters the coiler and is stretched, the side guide plate performs a secondary short stroke closing and switches to the pressure control mode. The side guide plate continues to close until the standard side guide plate pressure is reached; (4) When the side guide opening is less than the strip width and reaches the set value, but still does not reach the standard side guide pressure, the side guide stops closing, the control mode is switched to position control mode, and the side guide opening is locked at the strip width minus the set value; (5) In the position control mode, when the side guide plate detection pressure reaches the set condition, the side guide plate will immediately increase the opening width and switch back to the pressure control mode to close the side guide plate; (6) When the tail of the strip passes through the pinch roller, the rear guide plate opens to the standard opening.

2. A control method for preventing the hot-rolled thin-gauge coiling side guide from pinching steel according to claim 1, characterized in that: In the step (1), the standard opening degree is that the actual opening degree of the side guide plate is greater than the feedback value of the magnetic scale of the side guide plate by 0-5 mm.

3. The control method for preventing the side guides from pinching steel during hot rolling thin-gauge coiling according to claim 1, characterized in that: In the step (4), the setting value is 2 mm.

4. The control method for preventing the hot-rolled thin-gauge coiling side guide from pinching steel according to claim 1, characterized in that: In the step (5), the setting condition is that the side guide plate detection pressure is greater than the standard side guide plate pressure by 3KN and lasts for 0.3 seconds.

5. The control method for preventing the hot-rolled thin-gauge coiling side guide from pinching steel according to claim 1, characterized in that: In the step (5), the side guide plate increases the opening width and opens by 20 mm.

6. The control method for preventing the hot-rolled thin-gauge coiling side guide from pinching steel according to claim 1, characterized in that: In the step (1), the side guide plate calibration should be performed when the working roll is repaired or replaced.

7. The control method for preventing the hot-rolled thin-gauge coiling side guide from pinching steel according to claim 1, characterized in that: In the step (2), the speed of the strip on the cooling roller is in the range of 2.2-19 m / s, the applicable thickness specification is 1.2-25.4 mm, and the coiling temperature is 100-700°C.

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