JP2004351511A - Method and apparatus for dewatering in cold rolling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for dewatering in cold rolling using reversing rolling equipment by which the consumption of air is reduced and a coolant brought out of wiper rolls is removed. <P>SOLUTION: In this method, air nozzles 11a (11b) for blowing off air toward a metallic strip S from a side of the the metallic strip S are installed on the operation side of the reversing rolling equipment 10 and the coolant 9 which is brought out of the wiper rolls 5a (5b) on the metallic strip S is removed with the air blown out of the air nozzles 11a (11b). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a draining method and apparatus in cold rolling using a reverse type rolling facility.
[0002]
[Prior art]
In cold rolling of metal strip, a reverse type rolling equipment is often used.
FIG. 4 shows a schematic configuration of a metal strip cold rolling line using the reverse rolling equipment. In the cold rolling using the reverse type rolling equipment 110 shown in FIG. 4, the metal strip S is discharged from the right reel 101a, rolled by the work roll 102a of the reverse type rolling mill 102, and wound by the left reel 101b. The metal strip S taken out and taken up by the left reel 101b is unwound from the left reel 101b, rolled again by the work roll 102a, and taken up by the right reel 101a. In reverse rolling, this reciprocating rolling is repeated. Hereinafter, the entry side when the metal strip S paid out from the right reel 101a is rolled by the work roll 102a (the right side with respect to the work roll 102a in FIG. 4) will be described as the entry side.
[0003]
Coolant nozzles 107a are installed above and below the strip on the entry side of the work roll 102a, and coolant nozzles 107b are respectively installed above and below the strip on the exit side of the work roll 102a. When rolling at 102a, coolant 108 is sprayed from each of coolant nozzles 107a and 107b toward work roll 102a. Thereby, lubrication between the work roll 102a and the metal strip S and cooling of the work roll 102a and the metal strip S are performed.
[0004]
By spraying the coolant 108 onto the work roll 102a, the sprayed coolant 108 often accumulates on the metal strip S. If the coolant 108 accumulates on the metal strip S, oil stain may occur during annealing. Therefore, after the metal strip S passes through the work roll 102a, it is necessary to remove the coolant 108 accumulated on the metal strip S. For this reason, the reverse type rolling equipment 110 is provided with a work roll 102a and a wiper roll 105b on the exit side of the coolant nozzle 107b, and the coolant 108 on the metal strip S which advances from the entry side to the exit side of the work roll 102a. Is removed by the wiper roll 105b on the exit side of the rolling mill. In the reverse type rolling equipment 110, a wiper roll 105a is provided on the entry side of the work roll 102a and the coolant nozzle 107a, and the coolant 108 on the metal strip S that advances from the exit side of the work roll 102a toward the entry side. Is removed by the wiper roll 105a on the entry side of the rolling mill. This removal of the coolant 108 is called “draining”.
[0005]
Regarding the drainage of the coolant, for example, as shown in FIG. 7 (see Patent Document 1), a coolant nozzle 202 is provided on the entrance side of the work roll 201, and an air nozzle is provided on the exit side of the work roll 201. Is a first air nozzle 203 that collides the injection air with a substantially central region in the width direction of the metal strip S passing therethrough, and a second air that collides the injection air downstream from a collision position of the injection air from the first air nozzle 203. A draining device for a cold rolling mill including the nozzle 204 has been proposed.
[0006]
Returning to FIG. 4 again, a wiper roll coolant nozzle 106a is installed above and below the strip on the entry side of the work roll 102a, and a wiper nozzle is installed above and below the strip on the exit side of the work roll 102a, respectively. A roll coolant nozzle 106b is provided. Then, when the coolant is drained by the wiper rolls 105a and 105b, the coolant 109 is blown from the respective coolant nozzles 106a and 106b for the wiper rolls to the wiper rolls 105a and 105b. Thereby, lubrication between the wiper rolls 105a and 105b and the metal strip S and cooling of the wiper rolls 105a and 105b are performed.
[0007]
A thickness gauge 104a is installed above the strip on the entry side of the reverse rolling equipment 110, and a thickness gauge 104b is also installed above the strip on the exit side of the reverse rolling equipment 110. The thickness gauge 104a measures the thickness of the metal strip S when the metal strip S advances from the entry side to the exit side, and control means (not shown) controls the rolling mill 102 based on the measured thickness value. Control is performed. Further, the thickness gauge 104b measures the thickness of the metal strip S when the metal strip S advances from the exit side to the entrance side, and a control unit (not shown) similarly performs rolling based on the measured thickness value. The control of the pressure of the machine 102 is performed. In FIG. 3, reference numerals 103a and 103b indicate deflector rolls.
[0008]
FIG. 5 shows an image of the coolant 109 taken out from the upper wiper roll 105a onto the metal strip S.
If the coolant 109 is blown from the wiper roll coolant nozzle 106a to the wiper roll 105a while the metal strip S is traveling from the entry side to the exit side, the coolant 109 is taken out of the wiper roll 105a onto the metal strip S. The metal strip S moves to the work roll 102a side together with the metal strip S. However, when the rolling speed of the metal strip S increases, the circumferential speed of the wiper roll 105a increases, and the rotation of the wiper roll 105a pulls the coolant 109 out of the reverse rolling equipment 110. At this time, the coolant 109 is taken out to the thickness gauge 104a installed on the entry side of the reverse type rolling equipment 110, and it becomes difficult to measure the thickness by the thickness gauge 104a.
[0009]
In order to solve such a problem, conventionally, as shown in FIG. 6, a plurality of air nozzles 112 extending in the width direction of the metal strip S are provided between the wiper roll 105a and the thickness gauge 104a. An air header 111 is provided, and air is blown from each air nozzle 112 toward the surface of the metal strip S. By blowing air from each air nozzle 112 toward the surface of the metal strip S, the coolant 109 taken out of the rolling equipment 110 can be removed.
[0010]
Although not shown, when the metal strip S is moving from the exit side to the entrance side, similarly, when the coolant 109 is blown from the coolant nozzle 106b for the wiper roll to the wiper roll 105b, the coolant 109 The metal strip S is taken out of the roll 105b and collected on the metal strip S, and moves together with the metal strip S toward the work roll 102a. However, when the rolling speed of the metal strip S increases, the peripheral speed of the wiper roll 105b increases, and the coolant 109 is pulled out by the rotation of the wiper roll 105b and taken out of the reverse type rolling equipment 110. At this time, there is a problem that the coolant 109 is taken out to the thickness gauge 104b installed on the exit side of the reverse rolling equipment 110, and it becomes difficult to measure the thickness by the thickness gauge 104b.
For this reason, between the wiper roll 105b and the thickness gauge 104b, an air header 111 having a plurality of air nozzles 112, which is similar to the air header shown in FIG. ing.
[0011]
[Patent Document 1]
JP-A-7-265916
[Problems to be solved by the invention]
However, in the conventional draining method shown in FIG. 6, it is necessary to install an air header 111 having a plurality of air nozzles 112, which extends in the width direction of the metal strip S, and thus consumes air. There was a problem that the amount became enormous.
In addition, even if the draining device shown in FIG. 7 is applied to draining of the coolant 109 taken out of the reverse type rolling equipment 110, a plurality of first air nozzles 203 and second air nozzles 204 in the width direction of the plate may be used. It is necessary to install an air nozzle, and there is a problem that the consumption of air is enormous.
Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a reverse-type rolling facility capable of reducing the amount of air consumption and removing coolant taken out from a wiper roll. It is an object of the present invention to provide a method and an apparatus for draining cold rolling.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a draining method in cold rolling according to claim 1 of the present invention is directed to a reverse type including a wiper roll for draining coolant on a metal strip on both sides in a line direction of a reverse type rolling mill. A draining method in cold rolling using a rolling facility, wherein the coolant taken out on the metal strip outside the reverse rolling facility, air is blown from the side of the metal strip toward the metal strip. It is characterized by removing.
According to a second aspect of the present invention, in the method of draining in cold rolling according to the first aspect of the present invention, the flow rate of the air is controlled according to a rolling speed of the metal strip.
[0014]
In addition, a draining device in cold rolling according to claim 3 of the present invention is a cold rolling device using a reverse rolling mill equipped with wiper rolls for draining coolant on a metal strip on both sides in a line direction of a reverse rolling mill. A draining device for cold rolling, characterized in that an air nozzle is provided at an outer position in the line direction of the reverse rolling equipment and blows air from a side of the metal strip toward the metal strip.
Further, in the cold rolling device according to claim 4 of the present invention, in the invention according to claim 3, the flow rate control means for controlling a flow rate of air blown from the air nozzle according to a rolling speed of the metal strip. It is characterized by having provided.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a cold rolling line using a reverse type rolling equipment to which the draining method according to the present invention is applied.
In the cold rolling using the reverse type rolling equipment 10 shown in FIG. 1, the metal strip S is discharged from the right reel 1a and rolled by the reverse type rolling mill 2 (hereinafter simply referred to as the rolling mill 2). The metal strip S wound up by the reel 1b of the left side and wound up by the left side reel 1b is unwound from the left side reel 1b, rolled again by the rolling mill 2, and wound up by the right side reel 1a. It has become. In reverse rolling, this reciprocating rolling is repeated. Hereinafter, the entry side when the metal strip S paid out from the right reel 1a is rolled by the rolling mill 2 (the right side with respect to the rolling mill 2 in FIG. 1) will be described as the entry side.
[0016]
The rolling mill 2 includes a work roll 2a for performing reciprocating rolling of the metal strip S, and a plurality of backup rolls (not shown). A coolant nozzle 7a is provided above and below the strip on the entry side of the rolling mill 2, and a coolant nozzle 7b is provided above and below the strip on the exit side of the rolling mill 2, respectively. Each of the coolant nozzles 7a and 7b sprays a coolant 8 toward the work roll 2a when the metal strip S is rolled by the work roll 2a, whereby lubrication and work between the work roll 2a and the metal strip S are performed. The roll 2a and the metal strip S are cooled.
[0017]
Further, wiper rolls 5a, 5b are provided on both sides in the line direction of the rolling mill 2 with the coolant nozzles 7a, 7b interposed therebetween, respectively. That is, the wiper roll 5b is provided on the exit side of the work roll 2a and the coolant nozzle 7b, and the wiper roll 5a is provided on the entry side of the work roll 2a and the coolant nozzle 7a. The wiper roll 5b removes the coolant 8 on the metal strip S traveling from the entry side to the exit side of the work roll 2a, while the wiper roll 5a moves from the exit side to the entry side of the work roll 2a. The coolant 8 on the advancing metal strip S is removed.
[0018]
Further, a coolant nozzle 6a for a wiper roll is installed above and below the strip between the work roll 2a and the wiper roll 5a in the reverse rolling mill 10, respectively, and a space between the work roll 2a and the wiper roll 5b is provided. Coolant nozzles 6b for wiper rolls are installed above and below the strip, respectively. The coolant nozzle 6a for the wiper roll sprays the coolant 9 on the wiper roll 5a when draining the coolant by the wiper roll 5a, thereby performing lubrication between the wiper roll 5a and the metal strip S and cooling the wiper roll 5a. On the other hand, the coolant nozzle 6b for the wiper roll sprays the coolant 9 to the wiper roll 5b when draining the coolant by the wiper roll 5b, thereby performing lubrication between the wiper roll 5b and the metal strip S and cooling the wiper roll 5b. .
[0019]
A thickness gauge 4a is installed above the strip on the entry side of the reverse rolling equipment 10, and a thickness gauge 4b is also installed above the strip on the exit side of the reverse rolling equipment 10. The thickness gauge 4a measures the thickness of the metal strip S when the metal strip S advances from the entry side to the exit side, and control means (not shown) reduces the rolling force of the rolling mill 2 based on the measured thickness. Control is performed. Further, the thickness gauge 4b measures the thickness of the metal strip S when the metal strip S advances from the exit side to the entrance side, and the control means (not shown) similarly performs rolling based on the measured thickness value. The control of the pressure reduction of the machine 2 is performed. In FIG. 1, reference numerals 3a and 3b are deflector rolls.
[0020]
Here, as already described with reference to FIG. 5, when the coolant 9 is sprayed from the coolant nozzle 6a for the wiper roll onto the wiper roll 5a when the metal strip S is traveling from the entry side to the exit side, the coolant is cooled. Numeral 9 is taken out from the wiper roll 5a onto the metal strip S and accumulated on the strip, and moves together with the metal strip S toward the work roll 2a. However, when the rolling speed of the metal strip S increases, the peripheral speed of the wiper roll 5a increases, and the coolant 9 is taken out of the reverse type rolling equipment 10 by being pulled by the rotation of the wiper roll 5a. At this time, the coolant 9 is taken out to the thickness gauge 4a installed on the entry side of the reverse type rolling equipment 10, and it becomes difficult to measure the thickness by the thickness gauge 4a. It has been empirically found that the amount of the coolant 9 taken out of the reverse rolling mill 10 varies depending on the rolling speed of the metal strip S, and the larger the rolling speed, the larger the amount of the coolant 9 taken out.
[0021]
Therefore, as shown in FIG. 2, an air nozzle 11a that blows air from the side of the metal strip S (the operation side in the example of FIG. 2) toward the metal strip S between the wiper roll 5a and the thickness gauge 4a. The coolant 9 taken out of the wiper roll 5a onto the metal strip S is removed by air blown from the air nozzle 11a. Thereby, the thickness measurement by the thickness gauge 4a can be performed smoothly. In the present embodiment, the air blown from the air nozzle 11a is blown in a direction orthogonal to the traveling direction of the metal strip S and along the surface of the metal strip S. Thereby, the coolant 9 taken out from the wiper roll 5a onto the metal strip S can be effectively removed without waste.
[0022]
As described above, the air nozzle 11a that blows air from the side of the metal strip S in a direction orthogonal to the traveling direction of the metal strip S is installed, and the air blown from the air nozzle 11a causes the wiper roll 5a to release the metal strip S from the wiper roll 5a. Since the coolant 9 taken out is removed, the coolant 9 can be removed with one air nozzle, and the amount of air consumption can be reduced.
[0023]
The flow rate of the air blown from the air nozzle 11a is controlled according to the rolling speed of the metal strip S. More specifically, as shown in FIG. 2, the host computer 12 in which a table storing suitable values of the air pressure and the air flow rate with respect to the rolling speed of the metal strip S is set in advance, and the air pressure control valve 14 A controller 13 that outputs a preferable air pressure value is connected, and a rolling speed command of the metal strip S is input to the controller 13 from the reverse rolling mill 10. An air pressure control valve 14 for controlling air pressure from a compressor (not shown) is connected to the controller 13, and the air nozzle 11 a is connected to the compressor via the air pressure control valve 14. In controlling the flow rate of the air blown out from the air nozzle 11a, when a rolling speed command for the metal strip S is input from the reverse type rolling equipment 10 to the controller 13, the controller 13 sends a command to the controller 13 for the rolling speed of the metal strip S. The preferred value of the air pressure is read, and the preferred value is output to the air pressure control valve 14. The air pressure control valve 14 controls the air pressure from the compressor based on the suitable air pressure value, thereby controlling the flow rate of the air blown out from the air nozzle 11a.
[0024]
Since the amount of the coolant 9 taken out of the reverse type rolling equipment 10 changes depending on the rolling speed of the metal strip S, the flow rate of the air blown out from the air nozzle 11a is thus changed according to the rolling speed of the metal strip S. By controlling, the coolant 9 can be removed at an optimum air flow rate. The host computer 12, the controller 13, and the air pressure control valve 14 constitute "flow control means" defined in claim 4.
[0025]
Note that even when the metal strip S is traveling from the exit side to the entrance side, the coolant 9 is taken out of the reverse type rolling facility 10 and the sheet thickness installed on the exit side of the reverse type rolling facility 10 is removed. The coolant 9 may be taken out up to a total of 4b. For this reason, an air nozzle 11b that blows air toward the metal strip S from the side of the metal strip S is also provided between the wiper roll 5b and the thickness gauge 4b, and the air blown from the air nozzle 11b is used. The coolant 9 taken out on the metal strip S from the wiper roll 5b is removed. Thereby, the thickness measurement by the thickness gauge 4b can be performed smoothly. In the present embodiment, the air blown from the air nozzle 11b is blown in a direction orthogonal to the traveling direction of the metal strip S and along the surface of the metal strip S. Thereby, the coolant 9 taken out from the wiper roll 5b onto the metal strip S can be effectively removed without waste.
[0026]
The flow rate of the air blown from the air nozzle 11b is controlled according to the rolling speed of the metal strip S by flow rate control means similar to the means shown in FIG.
The embodiment of the present invention has been described above, but the present invention is not limited to this, and various changes and improvements can be made.
For example, the air nozzles 11a and 11b are not limited to be installed between the wiper rolls 5a and 5b on the operation side of the reverse rolling mill 10 and the thickness gauges 4a and 4b. Any position where the coolant 9 taken out on the S can be removed may be a position on the drive side of the reverse rolling equipment 10.
Further, the air blown out from the air nozzles 11a and 11b is not limited to the case where the air is blown out in a direction orthogonal to the traveling direction of the metal strip S.
[0027]
【Example】
The air drainage per unit time (l / min) was compared between the conventional draining method shown in FIG. 6 and the draining method of the present invention shown in FIG.
As a result, as shown in FIG. 3, in the conventional draining method shown in FIG. 6, the air consumption per unit time is 1200 l / min, whereas in the draining method of the present invention shown in FIG. The air consumption per hour was 400 l / min, which could be reduced to about 30% as compared with the conventional draining method shown in FIG.
[0028]
【The invention's effect】
As described above, according to the draining method and apparatus in the cold rolling using the reverse type rolling equipment according to claims 1 and 3 of the present invention, air is blown from the side of the metal strip toward the metal strip. An air nozzle is installed, and the coolant blown out from the wiper roll onto the metal strip is removed by the air blown out from the air nozzle. Therefore, the coolant can be removed with one air nozzle, thereby reducing the amount of air consumption. be able to.
According to the draining method and apparatus in the cold rolling using the reverse type rolling equipment according to claims 2 and 4 of the present invention, the flow rate of the air blown from the air nozzle is controlled according to the rolling speed of the metal strip. Therefore, the coolant can be removed at an optimum air flow rate.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a cold rolling line using a reverse type rolling equipment to which a draining method according to the present invention is applied.
FIG. 2 is a schematic perspective view showing an installation state of an air nozzle.
3 is a graph comparing the air consumption per unit time by the conventional draining method shown in FIG. 6 with the air consumption per unit time by the draining method of the present invention shown in FIG. 2;
FIG. 4 is a schematic configuration diagram of a cold rolling line using a general reverse type rolling facility.
FIG. 5 is an image diagram of a coolant taken out of a wiper roll above an entry side onto a metal strip.
FIG. 6 is a schematic perspective view showing an installation state of a conventional air nozzle.
FIG. 7 is a side view showing an installation state of another conventional air nozzle.
[Explanation of symbols]
1a, 1b Reel 2 Reverse type rolling mill 2a Work roll 3a, 3b Deflector roll 4a, 4b Thickness gauge 5a, 5b Wiper roll 6a, 6b Coolant nozzle 7a, 7b for wiper roll Coolant nozzle 8 Coolant 9 Coolant 10 Reverse type rolling equipment 11a, 11b Air nozzle 12 Host computer 13 Controller 14 Air pressure control valve S Metal strip

Claims (4)

A draining method in cold rolling using a reverse rolling mill equipped with a wiper roll for draining coolant on a metal strip on both sides in the line direction of the reverse rolling mill,
A method for draining water in cold rolling, wherein air blown toward the metal strip from sides of the metal strip is removed to remove coolant taken out of the metal strip outside the reverse rolling equipment. 2. The method according to claim 1, wherein the flow rate of the air is controlled according to a rolling speed of the metal strip. A water draining device in cold rolling using a reverse type rolling equipment provided with wiper rolls for draining coolant on a metal strip on both sides in the line direction of the reverse type rolling mill, wherein a position outside the line direction of the reverse type rolling equipment in the line direction. An air nozzle for discharging air from a side of the metal strip toward the metal strip. 4. The draining device in cold rolling according to claim 3, further comprising flow rate control means for controlling a flow rate of air blown from the air nozzle according to a rolling speed of the metal strip.

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