CN117415168A - Strip breakage control method and system for chilled strip steel and chilled strip steel - Google Patents

Abstract

The invention discloses a strip breakage control method and system for chilled strip steel and the chilled strip steel, wherein the specification of the chilled strip steel is 0.1 x 1500mm, and the method comprises the following steps: aiming at the belt breakage accident of the debugging product during single-rack rolling, determining the rolling pass of the single rack; adjusting rolling parameters of each pass in the single frame; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape; and rolling a target product by utilizing the rolling parameters after the adjustment of each pass, and controlling a rolling mill to start at a low speed to perform a coiling process after the rolling of the last pass is finished.

Description

Strip breakage control method and system for chilled strip steel and chilled strip steel

Technical Field

The application relates to the technical field of single-rack production line steel rolling, in particular to a strip breakage control method and system for chilled strip steel and the chilled strip steel.

Background

The specification of the user demand of the iron-nickel alloy austenitic single-phase tissue strip steel is 0.1 x 1500mm, but the current alloy steel with the thin specification of 0.1 x 1500mm can be produced, and the limit thin specification of 0.1 x 1500mm belongs to the industry blank.

In order to produce 0.1 x 1500mm extreme thin gauge strip, an persistent 20-roll mill is currently used for test rolling, but the extreme thickness of rolling is 0.15mm, and the surface of the strip has wrinkle defects. Therefore, no case of successfully producing 0.1 x 1500mm extreme thin gauge strip exists at present.

Disclosure of Invention

The invention provides a strip breakage control method and system for chilled strip steel and the chilled strip steel, which are used for making up the production blank of 0.1 x 1500mm limit thin-specification strip steel.

In order to solve the technical problem, according to a first aspect of the present invention, a method for controlling strip breakage of a chilled strip is disclosed, wherein the chilled strip has a specification of 0.1×1500mm, and the method comprises:

aiming at the belt breakage accident of the debugging product during single-rack rolling, determining the rolling pass of the single rack;

adjusting rolling parameters of each pass in the single frame; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape;

and rolling a target product by utilizing the rolling parameters after the adjustment of each pass, and controlling a rolling mill to start at a low speed to perform a coiling process after the rolling of the last pass is finished.

Preferably, the belt breakage accident comprises: rolling belt breakage accident, deviation belt breakage accident and blank belt breakage accident.

Preferably, different belt breakage events use different rolling passes.

Preferably, the adjusting the rolling parameters of each pass in the single stand specifically includes:

reducing the reduction of the 1 st pass from 0.55mm to 0.4mm, and reducing the unwinding tension of the 1 st pass from 55Mpa to 35Mpa;

adjusting a rolling mill plate shape control strategy of the 2 nd pass, and adjusting the relative position of the channeling roller of the 2 nd pass from 40mm to 60mm, wherein the bending roller of the working roller is increased from 200kn to 400kn;

and in the 3 rd to 5 th passes or the 3 rd to 6 th passes, replacing the working roll of the single frame with a minimum working roll with a roll diameter of 140mm, and optimizing the roll shape of the minimum working roll.

Preferably, the rolling mill plate shape control strategy for adjusting the 2 nd pass is specifically as follows: and modifying the rolling mill plate shape control strategy of the 2 nd pass from a side wave control mode to a micro side wave mode.

Preferably, the roughness of the minimum work roll is 0.1 μm and the roll convexity is 0.01 μm.

Preferably, in the acceleration process of the rolling speed of each pass from 0-30mpm, starting is carried out by taking constant rolling force as a starting standard.

Preferably, aiming at the empty running belt breakage accident of the debugging product, the speed of the rolling mill low-speed start-up coiling process is controlled to be below 20 mpm.

In a second aspect of the present invention, a strip breakage control system for a chilled strip having a gauge of 0.1×1500mm is disclosed, comprising:

the pass control device is used for determining the rolling pass of the single stand aiming at the belt breakage accident of the debugging product during rolling of the single stand;

the parameter adjusting device is used for adjusting the rolling parameters of each pass in the single frame; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape;

and the working roll control device is used for rolling a target product by utilizing the rolling parameters after the adjustment of each pass, and controlling the low-speed start of the rolling mill to carry out a coiling process after the rolling of the last pass is finished.

Preferably, the belt breakage accident comprises: rolling belt breakage accident, deviation belt breakage accident and blank belt breakage accident.

Preferably, different belt breakage events use different rolling passes.

Preferably, the parameter adjusting device is specifically configured to:

reducing the reduction of the 1 st pass from 0.55mm to 0.4mm, and reducing the unwinding tension of the 1 st pass from 55Mpa to 35Mpa;

adjusting a rolling mill plate shape control strategy of the 2 nd pass, and adjusting the relative position of the channeling roller of the 2 nd pass from 40mm to 60mm, wherein the bending roller of the working roller is increased from 200kn to 400kn;

and in the 3 rd to 5 th passes or the 3 rd to 6 th passes, replacing the working roll of the single frame with a minimum working roll with a roll diameter of 140mm, and optimizing the roll shape of the minimum working roll.

Preferably, the parameter adjusting device is specifically further configured to: and modifying the rolling mill plate shape control strategy of the 2 nd pass from a side wave control mode to a micro side wave mode.

Preferably, the roughness of the minimum work roll is 0.1 μm and the roll convexity is 0.01 μm.

Preferably, in the acceleration process of the rolling speed of each pass from 0-30mpm, starting is carried out by taking constant rolling force as a starting standard.

Preferably, aiming at the empty running belt breakage accident of the debugging product, the speed of the rolling mill low-speed start-up coiling process is controlled to be below 20 mpm.

In a third aspect of the present invention, a chilled band steel is disclosed, the specification of the chilled band steel is 0.1 x 1500mm, and the chilled band steel is obtained by rolling by using the strip breakage control method of the chilled band steel described in the above technical scheme.

Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:

in the scheme, the strip breakage accident of a debugging product of 0.1 x 1500mm extreme thin-gauge strip steel during single-stand rolling is analyzed, rolling passes are determined, rolling parameters of each pass are optimized, and a rolling mill low-speed start car is controlled to carry out a coiling process after final pass rolling is finished, so that the strip breakage accident of a target product during rolling is prevented, and further the production blank of the 0.1 x 1500mm extreme thin-gauge strip steel is made up.

The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures.

In the drawings:

FIG. 1 shows a flow chart of a method for controlling strip breakage of a chilled strip steel in accordance with an embodiment of the invention;

FIG. 2 shows a schematic diagram of a strip breakage control system for chilled strip steel in accordance with an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The embodiment of the invention discloses a strip breakage control method for chilled strip steel, which is used for producing chilled strip steel with the specification of 0.1 x 1500mm and is used for solving strip breakage accidents in the rolling process in a targeted manner. Referring to fig. 1, the method comprises the steps of:

and 11, determining rolling passes of the single stand aiming at belt breakage accidents of the debugging products during single stand rolling.

In this example, the commissioning product was used only for rolling blanks of 0.1 x 1500mm chilled strip.

Generally, the main phenomenon of belt breakage accidents: the three stages of threading, high-speed rolling and tail flicking all occur, and various belt breakage accidents during rolling mainly comprise: rolling belt breakage accident, deviation belt breakage accident and blank belt breakage accident.

In the production process of the extremely-thin-specification product, the rolling strip breakage accident is a main reason for influencing the stable production of the extremely-thin-specification chilled strip steel, and the damage is the greatest. Because the blanks generally need multiple passes to be rolled into finished products, the number of starting times of a single stand is generally more than 5 according to the rolling characteristic of the single stand. In each pass rolling, particularly in the last 3 passes, the rolling force of each pass needs to be increased to thin the strip steel, but after the rolling force is increased, the deflection deformation of the roller is serious, so that the strip breakage accident occurs. The rolling breakage accident may occur in each process, and the occurrence causes are various. For example, when the vehicle is started and broken, the strip steel is pressed for a long time in the starting and stopping stage, so that the strip steel is severely thinned locally, and the vehicle is started and broken. Interlayer dislocation belt breakage is caused by unwinding tension fluctuation.

The off-tracking and belt breaking accident is a defect caused by the influence of tension in the rolling process. The empty run-off accident is a strip breakage accident caused by the fact that a production line cannot be welded and cannot be penetrated due to the fact that the actual thickness of the 0.1 x 1500mm chilled strip steel belongs to an extremely thin specification product and is lower than the design thickness of the current production line.

The blank-run belt breakage accident refers to the situation that a driving belt is separated from a rim or slips when steel enters a coiling device after being rolled by a rolling mill in a rolling-coiling process. In this case, the belt loses traction to the steel, resulting in failure of the steel to enter the coiling apparatus normally, thereby causing interruption of production.

In this embodiment, different rolling passes may be adaptively selected for different belt breakage events. For example, aiming at the rolling belt breakage accident of the debugging product, the rolling pass of the single frame is controlled to be 5. Aiming at the deviation and belt breakage accidents of the debugging products, the rolling pass of the single frame is controlled to be 6. For another example, 5 passes are typically used, increasing to 6 passes if a preset accident occurs. Such as a failure to start a car, a defect in plate shape quality, etc., the rolling pass can be increased.

And step 12, adjusting rolling parameters of each pass in the single frame.

In this embodiment, the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape.

In the process of adjusting the rolling parameters of each pass, since rolling problems encountered in each pass are different, control measures for preventing a rolling strip breakage accident are described for each pass in the following examples.

The reduction of the 1 st pass was reduced from 0.55mm to 0.4mm, and the unwinding tension of the 1 st pass was reduced from 55Mpa to 35Mpa. The reason is that: the main goal of the 1 st pass is to reduce the thickness of the strip steel to the greatest extent, but in the rolling process of the debugging product, the strip breakage accident of the debugging product frequently occurs in the starting process due to the overlarge rolling reduction of the 1 st pass (more than 0.55 mm), so that the rolling reduction of the 1 st pass is reduced from 0.55mm to 0.4mm, and the starting strip breakage in the 1 st pass is effectively controlled. In addition, since the material fed in the 1 st pass is an annealing material, if the uncoiling tension is set unreasonably, interlayer dislocation of the material is caused in the uncoiling process, and tension is caused to fluctuate instantaneously, so that tension fluctuation belt breakage accidents occur. Therefore, the uncoiling tension of the 1 st pass is reduced from 55Mpa to 35Mpa, so that the problem of dislocation and belt breakage between layers is effectively solved.

The key point of preventing the belt breakage in the 2 nd pass is to prevent the occurrence of accidents of roller tightening and belt breakage due to deflection. The edge wave mode of the 2 nd pass can cause the edge wave of the actual strip steel to exceed 40IU, and the product is debugged to have the roller folding and tightening accident under the mode. Therefore, in this embodiment, the rolling mill shape control strategy of the 2 nd pass is adjusted, and the rolling mill shape control strategy of the 2 nd pass is modified from the side wave control mode to the micro side wave mode, so as to solve the occurrence of the roll-tightening accident. In addition, the relative position of the channeling rolls of the 2 nd pass is adjusted from 40mm to 60mm, the bending rolls of the working rolls are increased from 200kn to 400kn, the rolling stability can be obviously improved, and the deviation and belt breakage accidents in the 2 nd pass do not occur.

In the 3 rd to 5 th passes or the 3 rd to 6 th passes, the strip shape is deteriorated due to a sharp increase in the rolling force, resulting in rolling strip breakage. In order to avoid the accident of broken belt caused by abnormal rising of rolling force, the rolling force is controlled by changing the working rolls and increasing convexity on the working rolls. Specifically, the diameter range of a single-frame work roll for rolling 0.1 x 1500mm chilled band steel is controlled to be 140-170 mm, so in the embodiment, the work roll of the single frame is replaced by a minimum work roll with the diameter of 140mm, rolling force is reduced by using the minimum work roll, the roll shape of the minimum work roll is optimized, the roughness of the minimum work roll is controlled to be 0.1 mu m, the roll convexity is controlled to be 0.01 mu m, the rolling force of each pass is effectively controlled by changing the roll shape, and the rolling force is reduced to be less than 1000t from 2100 t. And (3) along with the thinning of the strip steel, after the single-pass rolling of the single stand is finished, restarting the next pass of rolling.

It is noted that the last pass rolling parameters need to be referenced to the rolling result of the previous pass. For example, the 6 th pass rolling parameters are determined according to the 5 th pass rolling condition, and generally load 20% -40% of 5 passes is applied.

In addition, as 0.1 x 1500mm of chilled band steel belongs to extremely thin specification band steel, in the process of accelerating the rolling speed from 0 to 30mpm, in order to ensure the thickness and the shape of the band steel, parameters such as tension, bending roll, rolling force and the like of a single frame are required to be quickly adjusted in place, and the band breakage accident can occur due to parameter overshoot. In order to solve the problem, the thickness and the shape of the strip steel are ensured, and in the acceleration process of rolling speed of each pass from 0-30mpm, the constant rolling force is used as a starting standard for starting, so that the accidents of starting and strip breakage caused by abnormal fluctuation of parameters are avoided. On the basis, the tension threshold value can be set to prevent the tension from exceeding the tension to break the belt, and measures such as plate shape constant control can be implemented. For example, an actual value of tension reaching less than 20% of the set point triggers a rolling mill protection chain; for another example, the plate shape control is controlled to be automatically closed when the vehicle is started, and the optimal secondary data control is adopted to ensure the actual plate shape effect after the vehicle is started.

Aiming at the deviation and strip breakage accidents of the debugging products, in order to control the deviation of the strip steel, a mode of increasing tension and pass is generally adopted for control. The method is influenced by large rolling force, slight edge cracking defects exist at the edge of the strip steel, particularly the chilled strip steel with extremely thin specification, the risk of edge cracking exists under the action of large tension, the risk of rolling deviation exists under small tension, and the parameter setting of each pass is required to prevent the strip steel rolling deviation and consider the edge cracking. In consideration of the above situation, the present embodiment takes into consideration the prevention of strip deviation and strip breakage by increasing the single-stand rolling pass to 6 passes and reducing the reduction rate of each pass. Specifically, on the basis of controlling the maximum rolling reduction to be less than or equal to 40%, rolling reduction of each pass is ordered from large to small, and rolling reduction of the last pass is controlled to be 20% -40% of that of the previous pass. In addition, the unit tension of each pass is controlled within 200Mpa to ensure rolling stability.

And step 13, rolling a target product by utilizing the rolling parameters after each pass is adjusted, and controlling a rolling mill to start a rolling process at a low speed after the last pass is finished.

In the embodiment, aiming at the empty belt breakage accident of the debugging product, after the last pass rolling is finished, the roll gap of the working roll is opened to the maximum, the wringing roll is completely opened, the low-speed starting of the rolling mill is controlled, and the starting speed is adjusted to 20mpm from 30mpm, so that the starting stability is ensured, and the subsequent coiling process is facilitated.

The scheme of the invention can successfully produce the chilled band steel with the limit thin specification of 0.1 x 1500mm, fills the blank of industry and has important significance for rolling the chilled band steel with the limit thin specification. The yield benefit of the extremely thin gauge chilled strip is calculated as 200t per year, with a profit per ton of approximately 5000 yuan. The actual benefit of the extremely thin chilled strip steel=production line per ton steel profit=200×5000=100 ten thousand yuan, and can bring great profit to industry.

Based on the same inventive concept, the following embodiments disclose a strip breakage control system for a chilled strip with a gauge of 0.1 x 1500mm, referring to fig. 2, comprising:

a pass control device 21, configured to determine a rolling pass of the single stand for a strip breakage accident of a commissioning product during rolling of the single stand;

parameter adjusting means 22 for adjusting rolling parameters of each pass in the single stand; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape;

the working roll control device 23 is used for rolling the target product by using the rolling parameters after the adjustment of each pass, and controlling the low-speed start of the rolling mill to perform the coiling process after the rolling of the last pass is finished.

Preferably, the belt breakage accident comprises: rolling belt breakage accident, deviation belt breakage accident and blank belt breakage accident.

Preferably, different belt breakage events use different rolling passes.

Preferably, the parameter adjusting device 22 is specifically configured to:

reducing the reduction of the 1 st pass from 0.55mm to 0.4mm, and reducing the unwinding tension of the 1 st pass from 55Mpa to 35Mpa;

adjusting a rolling mill plate shape control strategy of the 2 nd pass, and adjusting the relative position of the channeling roller of the 2 nd pass from 40mm to 60mm, wherein the bending roller of the working roller is increased from 200kn to 400kn;

and in the 3 rd to 5 th passes or the 3 rd to 6 th passes, replacing the working roll of the single frame with a minimum working roll with a roll diameter of 140mm, and optimizing the roll shape of the minimum working roll.

Preferably, the parameter adjusting device 22 is specifically further configured to: and modifying the rolling mill plate shape control strategy of the 2 nd pass from a side wave control mode to a micro side wave mode.

Preferably, the roughness of the minimum work roll is 0.1 μm and the roll convexity is 0.01 μm.

Preferably, in the acceleration process of the rolling speed of each pass from 0-30mpm, starting is carried out by taking constant rolling force as a starting standard.

Preferably, aiming at the empty running belt breakage accident of the debugging product, the speed of the rolling mill low-speed start-up coiling process is controlled to be below 20 mpm.

Based on the same inventive concept, the following examples disclose a chilled band steel with a gauge of 0.1 x 1500mm, which is rolled by using the strip breakage control method of the chilled band steel described in the foregoing scheme.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (10)

1. A method for controlling strip breakage of a chilled strip steel, wherein the chilled strip steel has a gauge of 0.1 x 1500mm, the method comprising:

aiming at the belt breakage accident of the debugging product during single-rack rolling, determining the rolling pass of the single rack;

adjusting rolling parameters of each pass in the single frame; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape;

and rolling a target product by utilizing the rolling parameters after the adjustment of each pass, and controlling a rolling mill to start at a low speed to perform a coiling process after the rolling of the last pass is finished.

2. The method of claim 1, wherein the belt break event comprises: rolling belt breakage accident, deviation belt breakage accident and blank belt breakage accident.

3. The method of claim 2, wherein different belt breaks occur with different rolling passes.

4. A method according to claim 3, characterized in that said adjusting rolling parameters of each pass in said single stand comprises in particular:

reducing the reduction of the 1 st pass from 0.55mm to 0.4mm, and reducing the unwinding tension of the 1 st pass from 55Mpa to 35Mpa;

adjusting a rolling mill plate shape control strategy of the 2 nd pass, and adjusting the relative position of the channeling roller of the 2 nd pass from 40mm to 60mm, wherein the bending roller of the working roller is increased from 200kn to 400kn;

and in the 3 rd to 5 th passes or the 3 rd to 6 th passes, replacing the working roll of the single frame with a minimum working roll with a roll diameter of 140mm, and optimizing the roll shape of the minimum working roll.

5. The method according to claim 4, wherein the adjusting of the rolling mill strip shape control strategy of pass 2 is in particular: and modifying the rolling mill plate shape control strategy of the 2 nd pass from a side wave control mode to a micro side wave mode.

6. The method of claim 4, wherein the minimum work roll roughness is 0.1 μm and the roll crown is 0.01 μm.

7. The method according to claim 4, wherein the start-up is performed with constant rolling force as start-up standard during acceleration of rolling speed of each pass from 0 to 30 mpm.

8. The method of claim 1, wherein the speed of the rolling mill low speed start coiling process is controlled to be below 20mpm for empty run-out accidents of the debugging product.

9. A strip breakage control system for a chilled strip, wherein the chilled strip has a gauge of 0.1 x 1500mm, comprising:

the pass control device is used for determining the rolling pass of the single stand aiming at the belt breakage accident of the debugging product during rolling of the single stand;

the parameter adjusting device is used for adjusting the rolling parameters of each pass in the single frame; the rolling parameters include one or more of the following: reduction, uncoiling tension, channeling relative position and roller shape;

and the working roll control device is used for rolling a target product by utilizing the rolling parameters after the adjustment of each pass, and controlling the low-speed start of the rolling mill to carry out a coiling process after the rolling of the last pass is finished.

10. A chilled band steel, characterized in that the chilled band steel has a specification of 0.1 x 1500mm, and is rolled by the strip breakage control method of the chilled band steel according to any one of the preceding claims 1-8.