KR101175794B1

KR101175794B1 - Rolling mill

Info

Publication number: KR101175794B1
Application number: KR1020100028790A
Authority: KR
Inventors: 박영국; 백인철; 이성철
Original assignee: 현대제철 주식회사
Priority date: 2010-03-30
Filing date: 2010-03-30
Publication date: 2012-08-21
Also published as: KR20110109183A

Abstract

The present invention relates to a rolling mill, comprising: a first rolling unit for rolling a raw material, a feed roller unit for transferring a material disposed on the rear side of the first rolling unit and sent out from the first rolling unit; It characterized in that it comprises a sensor for detecting the up and down deformation of the material front end portion conveyed by the roller unit, and the display unit for outputting the up and down deformation of the material front end portion detected by the sensor unit on the screen.
According to the present invention, when the up and down deformation of the material end portion occurs, it can be automatically corrected through the speed controller to improve productivity.

Description

Rolling Mill {ROLLING MILL}

The present invention relates to a rolling mill, and more particularly, to a rolling mill for detecting and correcting the up and down deformation of the material tip portion sent out from the rolling section.

In general, steel production consists of a steelmaking process for producing molten iron, a steelmaking process for removing impurities from molten iron, a regeneration process in which iron in a liquid state becomes a solid, and a rolling process in which iron is made of steel or wire.

The process of making pig iron, the first step in making steel from iron ore, is called steelmaking, and the process of making steel from pig iron is called steelmaking. The casting process is a process in which a molten iron is injected into a mold and then passed through a continuous casting machine, cooled, and solidified to continuously form an intermediate material such as slab or bloom. The rolling process is a process of passing an intermediate material such as a slab, a bloom, etc. produced in a continuous casting process through a plurality of rotating rollers and applying a continuous force to increase or decrease the thickness thereof. The rolling process is roughly classified into hot rolling and cold 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 mill capable of detecting and correcting the upward and downward deformation of the tip of the material sent out from the rolling section.

Rolling machine according to an aspect of the present invention comprises: a first rolling unit for rolling a material; A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit; A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit; And a display unit connected to the sensor unit and outputting a vertical deformation of the material tip detected by the sensor unit on the screen.

Preferably, the sensor unit is a laser displacement sensor for irradiating a laser toward the material, receiving a laser reflected from the material to measure the distance to the material.

Preferably, the apparatus may further include a fluid spray unit disposed below the transfer roller unit and disposed to surround the sensor unit and injecting a fluid upwardly of the sensor unit to block foreign matter attached to the material from falling onto the sensor unit. .

Preferably, the apparatus further includes a steam suction unit which is provided in the transfer roller unit and sucks steam generated from the material.

More preferably, the water vapor suction unit, the suction inlet is located in the transfer roller, the water vapor generated from the material; A suction duct communicating with the suction port and discharging the introduced water vapor to the outside; And a suction pump provided in the suction duct to provide suction power in the suction duct.

According to another aspect of the present invention, a rolling machine includes: a first rolling part for rolling a material; A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit; A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit; A second rolling part disposed at a rear side of the feed roller part to roll the material; And a speed control unit connected to the sensor unit to control driving of the second rolling unit according to the up and down deformation of the material tip detected by the sensor unit.

Preferably, the display unit further includes a display unit connected to the sensor unit and outputting a vertical deformation of the material tip detected by the sensor unit on the screen.

Preferably, the sensor unit is a laser displacement sensor for irradiating a laser toward the surface of the material, receiving a laser reflected from the surface of the material to measure the distance to the material.

Preferably, the second rolling unit includes a second upper work roll for pressing the material from the upper side, and a second lower work roll for pressing the material from the lower side, and the speed control unit detects the sensor unit. When the deformation of the material front end is upward, the speed of the second upper work roll is higher than the speed of the second lower work roll, and when the deformation of the material tip detected by the sensor is downward, the second upper part The speed of the work roll is lower than the speed of the second lower work roll.

Preferably, the second rolling unit includes a second upper work roll for pressing the material from the upper side, and a second lower work roll for pressing the material from the lower side, and the speed control unit detects the When the deformation of the material tip is upward, the speed of the second lower work roll is lower than the speed of the second upper work roll, and when the deformation of the material tip detected by the sensor is downward, the second lower work roll is lower. The velocity of is higher than the velocity of the second upper work roll.

According to the present invention, it is possible to accurately measure the presence or absence of the up and down deformation of the material front end portion conveyed by the feed roller, so that the operator can easily correct the up and down deformation of the material tip portion can solve the problem of poor quality of the material.

In addition, according to the present invention, when the up and down deformation of the material end portion occurs can be automatically corrected through the speed control unit can improve the productivity.

In addition, according to the present invention, since the sensor unit is disposed below the feed roller and is not affected by the water vapor generated by the contact of the coolant with the material, the accuracy of the up-down deformation measurement of the material tip can be improved.

1 is a side view schematically showing a rolling mill according to an embodiment of the present invention.
Figure 2 is a front view schematically showing a rolling mill according to an embodiment of the present invention.
3 is a plan view schematically showing a sensor unit and a fluid injection unit of the rolling mill according to an embodiment of the present invention.
4 is a side view schematically showing a sensor unit and a fluid injection unit of the rolling mill according to an embodiment of the present invention.
Figure 5 is a block diagram showing the control flow of the rolling mill according to an embodiment of the present invention.
6 is a view showing a state in which a rolling mill detects the upward deformation of the material front end portion according to an embodiment of the present invention.
7 is a view showing a state in which the rolling mill detects the downward deformation of the material end portion according to an embodiment of the present invention.
8 is a view showing a state in which the rolling mill corrects the upward deformation of the material end portion according to an embodiment of the present invention.
9 is a view showing a state in which a rolling mill corrects the downward deformation of the material tip portion according to an embodiment of the present invention.
10 is a view showing a state in which a rolling mill corrects the upward deformation of the material end portion according to another embodiment of the present invention.
11 is a view showing a state in which a rolling mill corrects the downward deformation of the material end portion according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a rolling mill according to the present invention. For convenience of description, the thicknesses of the lines and the size of the elements shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a side view schematically showing a rolling mill according to an embodiment of the present invention, Figure 2 is a front view schematically showing a rolling mill according to an embodiment of the present invention, Figure 3 is a rolling mill according to an embodiment of the present invention Is a plan view schematically showing a sensor portion and a fluid injection portion of a. 4 is a side view schematically showing a sensor unit and a fluid injection unit of the rolling mill according to an embodiment of the present invention, Figure 5 is a block diagram showing the control flow of the rolling mill according to an embodiment of the present invention. 6 is a view showing a state in which the rolling mill detects the upward deformation of the material end portion according to an embodiment of the present invention, Figure 7 is a state in which the rolling mill detects the downward deformation of the material tip portion according to an embodiment of the present invention The figure shown. 8 is a view showing a state in which the rolling mill corrects the upward deformation of the material end portion according to an embodiment of the present invention, Figure 9 is a state in which the rolling mill corrects the downward deformation of the material tip portion according to an embodiment of the present invention The figure shown. FIG. 10 is a view illustrating a state in which a rolling mill corrects upward deformation of a material tip portion, and FIG. 11 illustrates a state in which a rolling mill corrects downward deformation of a material tip portion, according to another embodiment of the present invention. The figure shown.

1 and 2, the rolling mill 1 according to an embodiment of the present invention, the first rolling unit 10, the feed roller unit 20, the sensor unit 30, the fluid spray unit 40, It includes a steam suction unit 50, the second rolling unit 60, the display unit 70, the speed control unit 80.

The first rolling part 10 and the second rolling part 60 roll the material S to a target thickness and width such that the material S is easily rolled and finished in the finishing rolling process.

The first rolling part 10 includes a first upper work roll 11 disposed on the upper side and a first lower work roll 12 disposed on the lower side. The raw material S is rolled by the first upper work roll 11 and the first lower work roll 12 while being transported between the first upper work roll 11 and the first lower work roll 12. The raw material S rolled and sent from the first rolling unit 10 is transferred to the post process by the feed roller unit 20.

The conveying roller part 20 is disposed at the rear side of the first rolling part 10. The conveying roller part 20 includes a plurality of conveying rollers 21 for conveying the raw material S in a later process, and a roller support 22 for rotatably supporting both ends of the conveying rollers 21.

A plurality of feed rollers 21 are installed at regular intervals from the outlet side of the first rolling part 10 to the inlet side of the second rolling part 60. The roller support 22 is formed so that the uppermost part is higher than the uppermost part of the conveying roller 21 so that the raw material S conveyed by the conveying roller 21 does not leave out. In addition, the roller support 22 extends in the transverse direction from the outlet side of the first rolling section 10 to the inlet side of the second rolling section 60 to serve as a rotation support of the feed roller 21.

The sensor unit 30 is disposed below the feed roller 21. The sensor unit 30 detects an upward deformation or a downward deformation of the front end portion of the material S, which is transferred to the post process by the feed roller 21. Since the sensor unit 30 is disposed below the feed roller 21, the coolant injected from the descaler unit (not shown) is not affected by water vapor generated by contact with the raw material S. The fact that the sensor unit 30 is not affected by water vapor means that the measurement accuracy of the sensor unit 30 is improved.

The material S sent from the first rolling part 10 may be a variety of materials such as a speed difference between the first upper and lower work rolls 11 and 12, a temperature difference between the upper and lower parts of the material S, and a slip of the material S. As a cause, the tip portion may be deformed upward or downward, and the sensor unit 30 detects the presence and the degree of such deformation.

The sensor unit 30 is disposed closer to the first rolling unit 10 than the second rolling unit 60. This is because the material S passes through the sensor unit 30 so as to control the driving of the second rolling unit 60 in accordance with the degree of deformation of the front end portion of the material S obtained through the sensor unit 30. This is to allow time to be introduced into the unit 60.

The sensor unit 30 may be formed of a laser displacement sensor. The laser displacement sensor irradiates a laser toward the surface of the material S from the lower side of the material S, receives a laser reflected from the surface of the material S, and measures a distance from the material S. The sensor unit 30 is disposed perpendicular to the feed roller 21 so that the irradiation direction of the laser is perpendicular to the lower surface of the material S.

6 and 7, the sensor unit 30 measures the distance between the reference height P _O and the material S, which is the height at which the sensor unit 30 is disposed. That is, the sensor unit 30 starts at the distal end of the work material S and reaches the separation point S _L spaced apart from the distal end of the work material S by a predetermined distance L. The sensor part 30 and the work material ( Measure the distance between S).

Sensor unit 30 includes a front end portion of the material (S) - comparing the averaged distances of the spaced points (S _L) interval specified, the section average value (H _L), and the interval average value (H _L) with a reference value (H _O) By identifying the presence or absence of the upward deformation or downward deformation of the material (S). Here, the reference value (H _O) refers to upward deformation or distance sensor 30 and the material (S) constituting the case downward deformation is not generated of the material (S).

The sensor unit 30 recognizes that the material S is upwardly deformed when the section average value H _L is greater than the reference value H _O (see FIG. 6), and the section average value H _L is the reference value H _O. If smaller, it is recognized that the material S is deformed downward (see FIG. 7).

1 and 2, a descaler unit is installed at the outlet side of the first rolling unit 10. The descaler unit removes the scale generated on the surface of the material S by spraying the cooling water toward the material S. At this time, as the cooling water injected from the descaler and the high temperature material S come into contact with each other, a large amount of water vapor is generated around the material S.

2 to 4, the fluid injection part 40 is located below the feed roller 21. The fluid injection unit 40 includes a plurality of discharge nozzles 41, and the discharge nozzles 41 are disposed to surround the sensor unit 30. In the present embodiment, the discharge nozzle 41 is formed of four and surrounds the sensor unit 30 from all directions. The discharge nozzle 41 communicates with a fluid supply source (not shown) disposed outside the rolling mill 1 and receives fluid therefrom.

The fluid injection unit 40 sprays the fluid at a high pressure above the sensor unit 30 to block foreign substances such as scales attached to the material S from falling down to the sensor unit 30. The discharge nozzle 41 may be formed to expand the shape of the discharge port into a funnel shape to more effectively block the falling of the foreign matter. As described above, since the foreign matter does not flow into the sensor unit 30 by the fluid spray unit 40, the up-down deformation of the front end portion of the material S through the sensor unit 30 can be accurately measured. In the present embodiment, the fluid injected from the fluid injection unit 40 is illustrated as air.

1 and 2, the steam suction unit 50 includes a suction port 51, a suction duct 52, and a suction pump 53. The steam suction unit 50 sucks steam generated by being provided to the transfer roller unit 20.

The suction port 51 is formed in a funnel shape to facilitate suction of the water vapor and is disposed at a height corresponding to the transfer path of the raw material S. Since the suction port 51 is installed in the roller support 22, the steam generated by the raw material S can suck the steam before it affects the operation of the sensor unit 30.

The suction port 51 communicates with the suction duct 52 forming a hollow cylindrical shape. The suction duct 52 discharges the water vapor sucked through the suction port 51 to the outside, and the suction pump 53 is provided therein. The suction pump 53 provides a suction force in the suction duct 52 so that water vapor is sucked through the suction port 51.

One end of the suction duct 52 and the suction duct 52 which is in contact with the suction port 51 is formed through the roller support 22. At this time, the suction port 51 may be formed to protrude toward the feed roller 21 rather than the rolling portion of the roller support (22). In addition, the suction port 51 may be formed to be concave in the interior of the roller support 22 so as not to be exposed to the inner surface of the roller support 22, and various modifications may be made depending on the site environment.

The second rolling part 60 is disposed at the rear side of the feed roller part 20 and rolls the material S to a target thickness and width. The second rolling part 60 includes a second upper work roll 61 disposed on the upper side and a second lower work roll 62 disposed on the lower side, and the raw material S includes the second upper work roll. It is rolled by the second upper work roll 61 and the second lower work roll 62 while being transferred between the 61 and the second lower work roll 62.

Referring to FIGS. 1 and 5, the display unit 70 is connected to the sensor unit 30 and the sensor unit 30 displays this information on the screen when an upward deformation or a downward deformation is detected by the sensor unit 30. Output In addition to the presence or absence of upward or downward deformation, the deformation information indicating the degree of upward or downward deformation may be output to the output information.

In this way, the operator can determine the presence and the degree of up and down deformation of the front end portion of the material (S) through the information output through the display unit 70, based on this control the driving of the second rolling unit 60 (S) The deformation of the tip portion can be corrected. On the other hand, the driving of the second rolling unit 60 may be made automatically by the speed control unit 80 to be described later in addition to the manual control by the operator.

The display unit 70 is installed on the roller support 22 to guide the operator of the deformation information of the front end of the material (S). In addition, where the operator's field of view can be secured, the display unit 70 may be installed in a configuration other than the roller support 22.

The speed controller 80 is connected to the sensor unit 30 to control the driving of the second rolling unit 60 based on the deformation information of the tip portion of the material S grasped by the sensor unit 30.

The second rolling part 60 is composed of a second upper work roll 61 and a second lower work roll 62, and each of the second upper work roll 61 and the second lower work roll 62 is made of The driving control is received by the speed control unit 80 provided in the two rolling unit 60.

When the upward deformation or the downward deformation of the front end of the material S is detected through the sensor unit 30, the speed control unit 80 based on the information transmitted from the sensor unit 30, the second upper work roll 61 or the second lower part. The speed of the work roll 62 is controlled to correct the deformation of the tip portion of the raw material S. FIG.

Hereinafter, a method of correcting the deformation of the tip portion of the material by using a rolling mill according to an embodiment of the present invention will be described.

The rolling mill 1 senses the position of the work piece S to measure the upward and downward deformation of the tip portion of the work piece S. In the present embodiment, when the raw material S is sent out from the first rolling part 10, an operation for detecting the up and down deformation of the front end of the raw material S is started (see FIG. 1).

When the raw material S is sent out from the first rolling part 10, the fluid injection part 40 and the steam suction part 50 are operated. Since the sensor unit 30 is disposed below the feed roller 21, not only is less affected by the water vapor generated by the raw material S, but also because the water vapor is sucked through the water vapor suction unit 50, the sensor unit 30 is provided. ) Is not affected by water vapor. In addition, foreign matters such as scales attached to the raw material S may be prevented from falling to the sensor unit 30 by the operation of the fluid injection unit 40. By removing such water vapor and foreign matter, the measurement accuracy of the sensor unit 30 is improved (see FIG. 2).

The sensor unit 30 is operated in accordance with the time point at which the material S passes through the vertical upward point of the sensor unit 30. The operation time of the sensor unit 30 may be calculated through the speed of the material S sent from the first rolling unit 10.

The sensor unit 30 measures the distance between the sensor unit 30 and the material S in the tip-spaced point S _L section of the material S. Through this, the sensor unit 30 may grasp the maximum value Hmax, the minimum value Hmin, and the section average value H _L , and compare the values with the reference value H _O to upwardly deform or lower the material S. Detect the presence and extent of deformation.

As shown in FIG. 6, the sensor unit 30 identifies that the material S is deformed upward when the section average value H _L is larger than the reference value H _O , and outputs this information through the display unit 70. do. In addition, as shown in FIG. 8, the speed controller 80 increases the speed of the second upper work roll 61 relative to the second lower work roll 62 based on the transmitted information. At this time, the speed difference between the second upper work roll 61 and the second lower work roll 62 is proportional to the maximum value Hmax in FIG. 6. On the other hand, as shown in Figure 10, when the speed of the second upper work roll 61 is running at a constant speed by reducing the speed of the second lower work roll 62 compared to the second upper work roll 61, The second upper work roll 61 is rotated faster than the second lower work roll 62. Of course, also at this time, the speed difference between the second upper work roll 61 and the second lower work roll 62 is proportional to the maximum value Hmax in FIG. 6. In this way, by adjusting the speed of the second upper work roll 61 and the second lower work roll 62 according to the degree of upward deformation of the front end of the material (S), the upward deformation of the front end of the material (S) can be easily corrected. have.

As shown in FIG. 7, the sensor unit 30 identifies that the material S is deformed downward when the section average value H _L is smaller than the reference value H _O , and outputs this information through the display unit 70. do. In addition, as shown in FIG. 9, the speed controller 80 reduces the speed of the second upper work roll 61 relative to the second lower work roll 62 based on the transmitted information. At this time, the speed difference between the second upper work roll 61 and the second lower work roll 62 is proportional to the minimum value Hmin in FIG. 7. On the other hand, as shown in Figure 11, when the speed of the second upper work roll 61 is running at a constant speed by increasing the speed of the second lower work roll 62 compared to the second upper work roll 61, the second lower The work roll 62 is rotated faster than the second upper work roll 61. Of course, also at this time, the speed difference between the second upper work roll 61 and the second lower work roll 62 is proportional to the minimum value Hmin in FIG. 7. As described above, the downward deformation of the front end of the work material S can be easily corrected by differentially adjusting the speeds of the second upper work roll 61 and the second lower work roll 62 according to the downward deformation of the front end of the work material S. have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. In addition, the rolling mill for detecting and correcting the up and down deformation of the front end portion of the raw material in the rough rolling process was described as an example. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: first rolling part 20: feed roller part
30 sensor part 40 fluid injection part
50: water vapor suction unit 60: second rolling unit
70 display unit 80 speed control unit

Claims

A first rolling part for rolling a material;
A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit;
A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit;
A display unit connected to the sensor unit and outputting a vertical deformation of the material tip detected by the sensor unit on a screen; And
Rolling mill, characterized in that provided in the conveying roller portion, comprising a steam suction portion for sucking the steam generated from the material.

The method of claim 1,
The sensor unit is a rolling mill, characterized in that the laser displacement sensor for irradiating the laser toward the material, receiving the laser reflected from the material to measure the distance to the material.

The method of claim 1,
Located at the lower side of the conveying roller portion, disposed to surround the sensor portion, characterized in that it further comprises a fluid injection unit for injecting a fluid above the sensor portion to block foreign matter attached to the material falling to the sensor portion Rolling mill.

delete

The method of claim 1,
The steam suction unit, the suction port is located in the conveying roller portion, the water vapor generated from the material flows;
A suction duct communicating with the suction port and discharging the introduced water vapor to the outside; And
And a suction pump provided in the suction duct to provide a suction force in the suction duct.

A first rolling part for rolling a material;
A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit;
A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit;
A second rolling part disposed at a rear side of the feed roller part to roll the material;
A speed control unit connected to the sensor unit and controlling the driving of the second rolling unit in accordance with the up and down deformation of the material tip detected by the sensor unit; And
Rolling mill, characterized in that provided in the conveying roller portion, comprising a steam suction portion for sucking the steam generated from the material.

The method of claim 6,
And a display unit connected to the sensor unit for outputting a vertical deformation of the material tip detected by the sensor unit on a screen.

The method of claim 6,
The sensor unit is a rolling mill, characterized in that the laser displacement sensor for irradiating the laser toward the surface of the material, receiving the laser reflected from the surface of the material to measure the distance to the material.

The method of claim 6,
Located at the lower side of the conveying roller portion, disposed to surround the sensor portion, characterized in that it further comprises a fluid injection unit for injecting a fluid above the sensor portion to block foreign matter attached to the material falling to the sensor portion Rolling mill.

delete

The method of claim 6,
The steam suction unit, the suction port is located in the conveying roller portion, the water vapor generated from the material flows;
A suction duct communicating with the suction port and discharging the introduced water vapor to the outside; And
And a suction pump provided in the suction duct to provide a suction force in the suction duct.

A first rolling part for rolling a material;
A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit;
A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit;
A second rolling part disposed at a rear side of the feed roller part to roll the material; And
And a speed control unit connected to the sensor unit to control driving of the second rolling unit according to the up and down deformation of the material tip detected by the sensor unit.
The second rolling unit includes a second upper work roll for pressing the material from the upper side, and a second lower work roll for pressing the material from the lower side,
The speed controller is configured to make the speed of the second upper work roll higher than the speed of the second lower work roll when the deformation of the material tip detected by the sensor is upward, and the material tip detected by the sensor. When the deformation is downward, the rolling mill, characterized in that to lower the speed of the second upper work roll than the speed of the second lower work roll.

A first rolling part for rolling a material;
A feed roller unit disposed at a rear side of the first rolling unit and configured to transfer the material sent out from the first rolling unit;
A sensor unit disposed below the feed roller unit and configured to detect a vertical deformation of the material tip portion transferred by the feed roller unit;
A second rolling part disposed at a rear side of the feed roller part to roll the material; And
And a speed control unit connected to the sensor unit to control driving of the second rolling unit according to the up and down deformation of the material tip detected by the sensor unit.
The second rolling unit includes a second upper work roll for pressing the material from the upper side, and a second lower work roll for pressing the material from the lower side,
The speed control part lowers the speed of the second lower work roll than the speed of the second upper work roll when the deformation of the material tip detected by the sensor is upward, and the material tip of the material detected by the sensor part. And when the deformation is downward, the speed of the second lower work roll is higher than the speed of the second upper work roll.