JP2542927B2 - Wiping roll pressure control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is based on a back-up roll row in which a plurality of unit back-up rolls with adjustable pressing forces are arranged along the axial direction of the wiping roll. When wiping the rolling oil on the metal strip surface after rolling with the wiping roll that is pressed, it is necessary to wipe the film thickness of the rolling oil evenly in the width direction of the metal strip and evenly the entire surface of the metal strip. The present invention relates to a wiping roll pressure control method that can be reliably and easily performed regardless of type, plate thickness, shape, surface state, etc.

[Conventional technology]

Generally, even and efficient wiping of rolling oil or coolant liquid (which is represented by rolling oil in the present invention) adhering to a rolled metal strip is the surface of the metal strip in the subsequent steps. It is important in order to prevent defects such as scratches, breakage of the ears and deterioration of shape, deterioration of quality, occurrence of operating troubles, and contamination of the working environment, and also from the recovery and use of expensive rolling oil. However, it is very difficult to evenly wipe the rolled metal strip evenly, and various methods and devices have been proposed and implemented for a long time, but both have advantages and disadvantages. Recently, a roll wiper having two rows of back-up rolls, in which a pair of short-length rolls are continuously arranged along the axial direction of the wiping rolls behind a pair of wiping rolls arranged above and below the strip passage. Was disclosed (Japanese Patent Laid-Open No.
63-309317). This product uses a short backup roll (hereinafter referred to as a unit backup roll) in a form that is obtained by dividing an ordinary backup roll into a plurality of pieces. Since the length is short, the roll diameter can be made small, and each unit back-up roll is equipped with an elastic member as a pressing means for pressing it toward the wiping roll, and it is pushed to the center of the back-up roll row. It is an attempt to wipe the rolling oil evenly in the width direction of the metal strip by adjusting the pressure strongly and weakly at both ends. However, since the pressing force generated by such an elastic member is proportional to the amount of displacement given to the elastic member, for example, when a spring is used as the elastic member, a spring having different spring constants in stages is used. Since it is necessary to prepare, it is inevitable to prepare a spring having a spring constant that generates a different appropriate pressing force at each predetermined position in the width direction of the wiping roll. Even if a spring is prepared, if the pressing force at a certain position in the width direction is not appropriate, it is difficult to properly adjust the pressing force at that position, and even if it can be adjusted, the operation will not stop. It is very difficult to re-adjust the pressing force of each unit back-up roll with, and moreover, the pressing force can be adjusted so as to exactly match a certain wiping condition (metal type, plate thickness, shape, surface condition, etc.). Drawback can not be a degreasing uniformly when wiping is carried out in the other wiping conditions also remain in that state as is possible has been made. Therefore, accidents due to poor wiping, and particularly quality deterioration due to defective coil shape during coiling when thin paper was not inserted, continued to occur.

[Problems to be Solved by the Invention]

The present invention solves the above-mentioned drawbacks of the prior art,
Even if the sheet thickness, shape, surface condition, etc. change, or even if the film thickness of the rolling oil after wiping changes partially during the rolling, the changes immediately follow each change and each unit back-up roll By adjusting the pressing force and controlling the wiping roll pressure, the film thickness of the rolling oil on the metal strip surface can be wiped evenly in the width direction and evenly over the entire surface including the longitudinal direction. This is an issue.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present inventors first thought that it was necessary to measure the film thickness of the rolling oil on the metal strip surface during running immediately after wiping. However, immediately after rolling, there is no method to measure the film thickness of the rolling oil immediately after wiping because it causes the rolling oil to smoke and rise due to heat generation due to deformation resistance during rolling.
Conventionally, when trying to measure the film pressure of rolling oil, it was inevitable to use a gravimetric method in which the line was stopped once and the sample was cut out and the weight of the film thickness oil adhering to it was measured and converted into film thickness. .

Therefore, as a result of various studies, rolling on a running metal strip surface using an infrared transmission type film thickness measuring method (hereinafter sometimes abbreviated as an infrared method) used for measuring the ink film thickness in printing. It became possible to continuously measure the oil film thickness. In addition, the pressing means for each unit back-up roll is a remote operation system that can be operated even while the rolling metal strip is running, and the rolling oil is applied by the infrared method on the downstream side of the wiping roll for each area corresponding to each position of the unit back-up roll. By measuring the film thickness of the infrared transmittance, by adjusting the pressing force of the unit back-up roll for each region based on the measurement data, by controlling the wiping roll pressure,
The present invention has been completed by clarifying that the above problems can be solved.

Hereinafter, a method of controlling the wiping roll pressure according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a roll wiper 1 on which the method of the present invention is carried out.
FIG. 2 is a side view of an example, FIG. 2 is a front view of another example of a roll wiper, and FIG. 3 is an overall view of an example of a rolling process including a roll wiper in which the method of the present invention is carried out. Is the principle diagram of the infrared transmission type film thickness measuring method, FIG. 5 is an infrared absorption spectrum diagram of an example of rolling oil, and FIG. 6 is the film thickness measurement value of rolling oil by the infrared transmission type film thickness measuring method and the weight method. FIG. 7 is a diagram showing an example of the film thickness distribution of rolling oil in the width direction of the metal strip after wiping, and FIG. 8 is an example of the relationship between the wiping roll pressure and the film thickness of rolling oil. FIG.

First, roll wiping will be briefly described. Rolling oil is supplied to both the front and back sides of plain steel, stainless steel, and various other metal strips in order to lubricate, cool, and remove foreign matter during cold rolling in order to make the surface of the rolled metal strip beautiful.
In order to prevent the rolling oil from interfering with the winding process immediately after rolling and subsequent processes and causing deterioration in quality, and for recovering and reusing expensive rolling oil, most of it is a metal strip surface. Wiping from and removing.

The main part of the roll wiper used for this wiping is configured as follows as shown in FIGS. 1 and 2. A pair of wiping rolls 2 arranged above and below the strip passage of the metal strip 1 (the same position as the metal strip 1 shown in the figure) and supported at both ends by bearings 2a, and behind each of the wiping rolls 2 respectively. In each of the at least one row, a plurality of unit back-up rolls 4 are linearly arranged in the body frame 6 and a back-up roll row 3 of this back-up roll row 3 is provided. It is provided with overall pressing means 7 provided at both ends of the main body frame 6 for pressing in the opposite direction, for example, hydraulic cylinders. A scraper 6a for removing rolling oil adhering to the surface of the wiping roll 2 is attached as shown in FIG. 1 as in the conventional case. To carry out the method of the present invention, the back-up roll rows 3 do not necessarily have to be two rows, but may be one row. Also, as each unit back-up roll 4, the back-up roll shaft 4a is 1
In addition to the case where the long roll axes of the book are common, it is preferable to use the unit back up rolls 4 as shown in FIG. 2 which are completely independent from each other by separating the back up roll shafts 4a. To be done. In each of the back up roll rows 3, the unit back up rolls 4 are mounted on different back up frames 5 regardless of whether the back up roll shafts 4a are common or independent. When the back-up roll row 3 is supported by the shaft 4a and the back-up roll row 3 is two rows, the same number of unit back-up rolls 4 are arranged side by side in each row, so that the metal strip 1 is viewed along the traveling direction. As shown in FIG. 2, the unit back-up rolls 4 are overlapped with each other, and each pair of the unit back-up rolls 4 which are overlapped with each other are mounted on one back-up roll frame 5.

One of the features of the method of the present invention is that the individual pressing means 8 of each unit back-up roll 4 can be remotely operated, and the unit can be used while the metal strip 1 is running based on the measured value by the infrared method described below. This is the point that the pressing force of the unit backup roll 4 is adjusted for each region corresponding to each position of the backup roll 4. In order to perform such adjustment easily and accurately, for example, a hydraulic cylinder is preferable as the pressing means 8 for individual use, which is installed on the main body frame 6 as shown in FIGS. Attach 8a (the tip of the cylinder rod in the case of a hydraulic cylinder) to the center of the back side of the back-up roll frame 5.

Another feature of the method of the present invention is that the infrared ray is projected onto the surface of the running metal strip 1 after wiping, the transmittance of at least the projection / reflection path thereof is measured, and further the film thickness of the rolling oil is measured by wiping. This is performed for each region corresponding to each position of the unit backup roll 4 on the downstream side of the roll 2. An infrared ray method that enables measurement of the film thickness of the rolling oil on the surface of the running metal strip 1 will be described.

As shown in FIG. 4, the infrared light emitted from the infrared light emitter 9 is condensed by the lens 10, and the interference filter 11 transmits only the specific wavelength which is well absorbed by the rolling oil. It is projected on the surface of the metal strip 1 by 12 and reflected. The reflected light is received by the photoelectric element 13, processed by the amplifier 14, the AD converter 15, the CPU (central processing unit) 16, etc., and displayed as the transmittance or the film thickness of the rolling oil. In the practice of the method of the present invention, if the measurement conditions by the infrared method are constant, the transmissivity, that is, the logarithm ln of the ratio of the intensity I of transmitted light to the intensity I ₀ of incident light (I ₀ / I)
Since (I ₀ / I) is proportional to the film thickness of the rolling oil and the concentration of the rolling oil, it is not always necessary to display the film thickness, and only the transmittance may be used.

The specific wavelength is known by making a survey on the relationship between the infrared absorption spectrum (μm) and the transmittance (%) of the rolling oil used, and in the case of FIG. 5 showing an example thereof, λiμm. Is a specific wavelength. In order to facilitate such on-site measurement, the infrared light emitting element 9 to the photoelectric element 13
It is convenient to use the sensor 17 which is a compact package.

It can be seen from FIG. 6 which compares the measurement data obtained by the infrared method with the measurement data by the conventional gravimetric method, and has sufficient accuracy.

In the method of the present invention, when the metal strip 1 travels in the direction of arrow X as shown in FIG.
Is installed on the downstream side of the wiping roll 2 and in each region corresponding to each position of the unit back-up roll 4, and the film thickness of the rolling oil, that is, the infrared transmittance is measured. Fig. 7 is a plot of the results obtained by measuring the film thickness of rolling oil having a half width on one side at each measuring point in a certain wiping state of the metal strip 1 running at 40 m / min after rolling in this way. Is
The film thickness of this rolling oil showed a non-uniform distribution in which the central portion and the end portions in the width direction were thin and the quarter portions were thick. From this wiping state, for example, when the pressing force of the unit back-up roll 4 located at the center of the width of the metal strip 1 is reduced by adjusting the pressing means 8 for individual use, the rolling oil film in that region is reduced. The thickness increased as shown in FIG. This indicates that the film thickness of the rolling oil can be increased or decreased by adjusting the pressing force of each unit backup roll 4.

That is, according to the method of the present invention, on the one hand, a remote controllable pressing means 8 is provided for each unit back-up roll 4 constituting the back-up roll row 3, and on the other hand, a unit is provided downstream of the wiping roll 2 after wiping. By measuring the film thickness, that is, the transmittance of the rolling oil in the region corresponding to each position of the back-up roll 4, and adjusting the pressing force of the unit back-up roll 4 on the basis of the result, the rolling oil in the width direction is adjusted. The wiping roll pressure is controlled so that the film thickness becomes uniform. The pressing force of the unit back-up roll 4 for each area is adjusted in combination with the adjustment of the pressing force of the whole back-up roll row 3 by the pressing means 7 for the whole.

In addition to the case where the metal strip 1 is run in only one direction, cold rolling is provided with winding machines 19 on both sides of the rolling machine body 18 as shown in FIG. 3, and one winding machine 19 is unwound. It is used as a machine and is equipped with a metal band coil 20 and a metal band 1 is deflector roll
In many cases, a reverse method is adopted in which after rolling and rolling through 21 and winding on the other winder 19, rolling is performed in the opposite direction and rolling is repeated when the winding is completed. In this case, as shown in FIG. 3, the roll wipers 22 are installed on both sides of the rolling mill body 18, and accordingly, the device for measuring the film thickness of the rolling oil, that is, the transmittance by the infrared method is also installed on both sides. For example, in the above example, the sensors 17 may be provided at the positions on both sides shown in FIG. 3 and used alternately depending on the reverse direction to measure the film thickness of the rolling oil, that is, the transmittance. Of.

According to the method of the present invention, it is easy to manually adjust the pressing force of the unit back-up roll 4 according to the change while monitoring the measurement result of the film thickness, that is, the transmittance of this rolling oil by the infrared method. However, by connecting them with existing technology using a computer and automating, the thickness of the rolling oil remaining on the metal strip surface can be made as thin as possible and the entire surface can be wiped evenly and evenly. It is preferable in terms of certainty and responsiveness.

〔The invention's effect〕

As described above in detail, in the method for controlling the wiping roll pressure according to the present invention, the pressing means for adjusting the pressing force of the unit back-up roll can be remotely operated for each region corresponding to each position of the unit back-up roll. At the same time, the film thickness of the rolling oil on the running metal strip surface is measured by the infrared method on each downstream side of the wiping roll, and the pressing force of the unit back-up roll is adjusted for each area based on the measurement result. By doing so, the following effects can be obtained.

1. Even if conditions such as metal type, plate thickness, shape, and surface condition change, the film thickness of the rolling oil on the metal strip surface can be wiped evenly and evenly to a predetermined thickness without fail. it can.

2. It is possible to immediately and continuously correct fluctuations in the film thickness of rolling oil during rolling or operation while continuing rolling and operation.

Therefore, it is possible to prevent various problems in quality due to poor wiping, occurrence of operational troubles, contamination of working environment, shortening of life of interleaving paper wound in the metal strip coil, and the like.

4. Since the film thickness of rolling oil can be made uniform, it is particularly effective for rolling extremely thin materials. It is possible to prevent the occurrence of defects in the winding shape in which the shape of the winding coil, which tends to occur when the interleaving paper is not inserted during the winding of the ultra-thin material, becomes a bamboo shoot shape.

[Brief description of drawings]

1 is a side view of one example of a roll wiper in which the method of the present invention is practiced, FIG. 2 is a front view of another example of a roll wiper, and FIG. 3 is a roll wiper in which the method of the present invention is carried out. Of the whole rolling process including the above, FIG. 4 is a principle diagram of an infrared transmission type film thickness measuring method, FIG. 5 is an infrared absorption spectrum diagram of an example of rolling oil, and FIG. 6 is an infrared transmission type film. FIG. 7 is a comparison diagram of film thickness measurement values of rolling oil by a thickness measuring method and a gravimetric method, FIG. 7 is a diagram showing an example of film thickness distribution of rolling oil in the width direction of a metal strip after wiping, and FIG. 8 is wiping. It is a figure which shows an example of the relationship between roll pressure and the film thickness of rolling oil. In the drawing 1 …… Metal band 2 …… Wiping roll 2a …… Bearing 3 …… Backup roll row 4 …… Unit backup roll 4a …… Backup roll shaft 5 …… Backup frame 6 …… Main body frame 6a… … Scraper 7 …… Whole pressing means 8 …… Individual pressing means 8a …… Operating point 9 …… Infrared emitter 10 …… Lens 11 …… Interference filter 12 …… Optical conduit 13 …… Photoelectric element 14… … Amplifier 15 …… AD converter 16 …… CPU 17 …… Sensor 18 …… Rolling machine main body 19 …… Winding machine 20 …… Metal strip coil 21 …… Deflector roll 22 …… Roll wiper X …… Metal strip Traveling direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Osamu Miyamoto, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Yasufumi Norimatsu 4-chome, Kannon-shinmachi, Nishi-ku, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) Reference JP-A-54-78348 (JP, A)

Claims (5)

(57) [Claims] 1. A pair of wiping rolls (2) arranged above and below a strip passage, and at least one row arranged behind each wiping roll (2) and having a plurality of lengths. A roll wiper comprising a short backup roll row (3) in which short unit backup rolls (4) are linearly arranged and a pressing means for pressing the backup roll row (3) toward the wiping roll (2). When the wiping is performed by adjusting the pressing force of each unit back up roll (4) so that the film thickness of the rolling oil of the rolled metal strip (1) traveling by Individual pressing means (8) for each unit back-up roll (4)
A remote control is provided, and the measurement of the transmittance in the infrared projection / reflection path on the surface of the running metal strip (1) after wiping is performed for each area corresponding to each position of the unit back-up roll (4). A method for controlling the wiping roll pressure, characterized in that the pressing force of the unit back-up roll (4) is adjusted for each of the above-mentioned regions based on the result obtained by going downstream from the wiping roll (2). 2. The wiping roll pressure according to claim 1, wherein the back-up roll rows (3) are two rows in which the same number of unit back-up rolls (4) are arranged side by side in each row. Control method. 3. The method for controlling the wiping roll pressure according to claim 1, wherein one row of back up roll rows (3) is used. 4. The back-up roll shaft (4a) is separated from each unit back-up roll (4) as the back-up roll row (3), and independent ones are used. The method for controlling the wiping roll pressure according to item 1. 5. A unit for back up rolls (3), wherein all unit back up rolls (4) use one long roll shaft as a back up roll shaft (4a) in common. The method for controlling the wiping roll pressure according to any one of 1 to 6 above.