JPH038516A - Method for controlling wiping roll pressure - Google Patents

Abstract

PURPOSE:To uniformly wipe the whole surface by measuring the film thickness of rolling oil through the infrared method on the downstream side of a wiping roll at every area corresponding to a unit backup roll and controlling the compressive force of the roll based on this result. CONSTITUTION:A compressive means 8 is provided at every unit backup roll 4 composing a line 3 of backup rolls so that it can be controlled remotely. A sensor 17 is provided on the downstream side of a wiping roll 2 and at every area corresponding to each position of a unit backup roll 4 to measure the film thickness of the rolling oil or the infrared transmissivity. The compressive force of the unit backup roll 4 is adjusted based on the result and the pressure of the wiping rolls 2 is controlled so that the thickness of the rolling oil is uniformized in the width direction. The adjustment of the compressive force of the unit backup roll is carried out in combination with the adjustment of the compressive force of all lines 3 of backup rolls by the compressive means 7 for the whole body.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a wiping roll that is pressed by a backup roll row in which a plurality of unit backup rolls each having an adjustable pressing force are arranged along the axial direction of the wiping roll. When wiping the rolling oil from the metal strip surface after rolling with a wiping roll, it is important to ensure that the film thickness of the rolling oil is uniform in the width direction of the metal strip and that the entire surface is evenly wiped. The present invention relates to a method of controlling wiping roll pressure that can always be carried out reliably and easily regardless of the shape, two-sided state, etc.

[Conventional technology]

Rolling oil or coolant liquid that generally adheres to rolled metal strips (in this invention, these are represented by rolling oil)
To wipe evenly and efficiently,
In order to prevent the occurrence of surface flaws, bent edges, and deterioration of the shape of the metal strip in subsequent processes, 2 deterioration of quality, and occurrence of operational troubles, 2 contamination of the work environment, and the recovery and use of expensive rolling oil. It's important. However, it is very difficult to wipe the rolled metal strip evenly and evenly, and various methods and devices have been proposed and implemented for some time, but all of them have advantages and disadvantages. Recently, a roll wiper has been developed which is equipped with two rows of backup rolls, each of which is a pair of wiping rolls arranged above and below a passageway, and behind which short rolls are arranged continuously along the axial direction of the wiping rolls. Disclosed (Japanese Unexamined Patent Publication No. 1983)
-309317). This product uses short backup rolls (hereinafter referred to as unit backup rolls) that are similar to a regular backup roll divided into multiple pieces, and the unit backup rolls are short in length. Because it is short, the roll diameter can be made small, and each unit backup roll is equipped with an elastic member as a pressing means to press it toward the wiping roll, so that the pressing force at the center of the backup roll row is strong and the pressing force is strong at both ends. The idea was to wipe the rolling oil evenly across the width of the metal strip by adjusting the pressure slightly. However, since the pressing force generated by such an elastic member is proportional to the amount of displacement applied to the elastic member, for example, when using a spring as the elastic member, it is necessary to prepare springs with different spring constants in stages. Therefore, it is necessary to prepare a spring with a spring constant that generates a different appropriate pressing force at each predetermined position in the width direction of the wiping roll, and it is necessary to prepare a spring with 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 position in the width direction is not appropriate, it will be difficult to properly adjust the pressing force at that position, and even if it can be adjusted, it will be difficult to adjust the pressing force at each position without stopping the operation. It is extremely difficult to readjust the pressing force of the unit backup roll, and even if the pressing force can be adjusted to exactly match the wiping conditions (type of metal, thickness, shape of one surface, etc.) However, when wiping is performed under other wiping conditions in this state, there is a drawback that the rolling oil cannot be removed evenly. Therefore, accidents caused by poor wiping and quality deterioration caused by defects in the shape of the coil during coiling, especially when thin materials are not inserted with a mount, continued to occur.

[Problem to be solved by the invention]

The present invention eliminates the drawbacks of the prior art, and even if the type of metal, plate thickness, shape and two-sided state, etc. change, the film thickness of rolling oil after wiping during rolling changes partially in the width direction. Even if
Metal by immediately following the change and adjusting the pressing force of each unit backup roll to control the wiping roll pressure? An object of the present invention is to make the film thickness of rolling oil on the tF surface uniform in the width direction and to wipe the entire surface evenly and evenly including the longitudinal direction.

[Means to solve the problem]

The present inventors thought that in order to solve the above problem, it is first necessary to measure the film thickness of rolling oil on the metal band surface during running immediately after wiping. However, immediately after rolling, rolling oil rises up in the form of smoke due to heat generated by the deformation resistance during rolling, and there is no way to measure the film thickness of rolling oil on the gold fiL band surface immediately after wiping. Previously, when attempting to measure the film thickness of rolling oil, the gravimetric method had to be used, in which the line was stopped once, a sample was cut out, the weight of the film thickness oil adhering to it was measured, and the weight was converted to film thickness. Ta.

As a result of various studies, we decided to use the infrared transmission film thickness measurement method (hereinafter sometimes abbreviated as the infrared method), which is used to measure ink film thickness in printing, to roll a metal strip while it is running. It has become possible to continuously measure oil film thickness. Furthermore, the pressing means for each unit backup roll is of a remote control type that can be operated even while the rolled metal strip is running, and a film of rolling oil is applied using infrared rays on the downstream side of the wiping roll in each area corresponding to each position of the unit backup roll. It has been found that the above problem can be solved by measuring the thickness using infrared transmittance and controlling the wiping roll pressure by adjusting the pressing force of the unit backup roll as described above based on the measured data. Thus, the present invention was completed.

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

FIG. 1 is a side explanatory view of one example of a roll wiper in which the method of the present invention is implemented, FIG. 2 is a front explanatory view of another example of the roll wiper, and FIG. 3 is a roll wiper in which the method of the present invention is implemented. 4 is a principle diagram of an infrared transmission method for determining film thickness al'1, FIG. 5 is an infrared absorption spectrum diagram of an example of rolling oil, and FIG. 6 is an infrared absorption spectrum diagram of an example of rolling oil. A comparison diagram of the film thickness measurement values of rolling oil by the transmission film thickness measurement method and the gravimetric 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. The figure is a diagram showing an example of the relationship between the wiping roll pressure and the film thickness of rolling oil.

First, roll wiping will be briefly explained.

During cold rolling of ordinary steel, stainless steel, and other various metal strips, rolling oil is supplied to both the front and back sides of the rolled metal strip to lubricate, cool, and remove foreign matter to make the rolled metal strip surface beautiful. In order to prevent the rolling oil from interfering with the winding process immediately after rolling and subsequent processes or causing quality deterioration, and to recover and reuse the expensive rolling oil, most of it is removed from the metal strip surface. It is removed by wiping.

The main parts of the roll wiper used for this wiping are constructed as follows, as shown in FIGS. 1 and 2. A pair of wiping rolls 2 are disposed above and below the passageway of the metal strip 1 (same position as the metal strip 1 shown in the figure) and have both ends pivotally supported by bearings 2a, and a pair of wiping rolls 2 are disposed behind each of the wiping rolls 2. A plurality of unit backup rolls 4 are arranged linearly in the main body frame 6 for each row of at least one row, and the entire backup roll row 3 is pressed toward the wiping roll 2. In order to do this, the main body frame 6 is provided with general pressing means 7, such as a hydraulic cylinder, provided at both ends thereof. Incidentally, a scraper 6a for removing rolling oil adhering to the surface of the wiping roll 2 is attached as shown in FIG. 1 in the same manner as in the prior art. To carry out the method of the present invention, the number of backup roll rows 3 does not necessarily have to be two, and may be one. In addition, each unit back-up roll 4 has one long roll shaft in common as its backup roll shaft 4a, and also a second roll shaft.
As shown in the figure, it is preferable to use unit backup rolls 4 whose respective backup roll shafts 4a are cut out to make them completely independent of each other. Regardless of whether the backup roll shafts 4a are common or independent, each unit backup roll 4 in each row of the backup roll rows 3 is supported by a backup roll shaft 4a mounted on a separate backup frame 5. When there are two backup roll rows 3, the same number of unit backup rolls 4 are arranged in each row, and therefore, when the metal strip 1 is viewed along the running direction, the unit backup rolls 4 are arranged in units as shown in FIG. The backup rolls 4 are overlapping, and each unit backup roll 4 of this overlapping pair is one backup roll frame 5.
is installed on.

One of the features of the method of the present invention is that the individual pressing means 8 of each unit backup roll 4 can be remotely controlled, and the unit backup can be performed even while the metal strip 1 is running based on the measured values by the infrared method described below. The point is to adjust the pressing force of the unit backup roll 4 to correspond to each position of the roll 4. In order to perform such adjustment easily and accurately, the individual pressing means 8 is preferably, for example, a hydraulic cylinder, which is installed on the main body frame 6 as shown in FIGS. 1 and 2, and its point of action is 8a (the tip of the cylinder iron in the case of a hydraulic cylinder) is attached to the center of the back of the backup roll frame 5.

Another feature of the method of the present invention is that infrared rays are projected onto the surface of the running metal strip 1 after wiping.
Measurement of the transmittance in the reflection path and further measurement of the film thickness of the rolling oil are carried out on the recording corresponding to each position of the unit backup roll 4 on the downstream side of the wiping roll 2. An infrared method that makes it possible to measure the film thickness of rolling oil on the surface of the metal strip 1 while it is running will be described.

As shown in FIG. 4, the infrared rays emitted from the infrared emitter 9 are collected by a lens 10, and only a specific wavelength that is well absorbed by rolling oil is transmitted by an interference filter 11. 12, it is projected onto the surface of the metal band 1 and reflected. The reflected light is received by a photoelectric element 13, an amplifier 14[AD converter],5. It is processed by the CPU (Central Processing Unit) 16 and the like and displayed on the permeated heavy aluminum as the film thickness of rolling oil. When carrying out the method of the present invention, if the measurement conditions by the infrared method are constant, the transmittance, that is, the intensity of the incident light (■). Strength of transmitted light against
Since the logarithm in (I o / I) of the ratio (I o / I) is proportional to the film thickness of rolling oil and the concentration of rolling oil, it is not necessarily necessary to display the film thickness, and only the transmittance is sufficient. .

The above specific wavelength is known by investigating the relationship between the infrared absorption spectrum (-) and transmittance (%) of the rolling oil used, and one example of this is shown in Figure 5.
Make the voice a specific wavelength. In order to facilitate the on-site implementation of such measurements, it is convenient to use a sensor 17 that includes everything from the infrared emitter 9 to the photoelectric element 13 in a compact manner.

Figure 6 shows that the measurement data obtained by this infrared method is compared with the measurement data by the conventional heavy f method.

It can be seen that there is sufficient accuracy.

In the method of the present invention, when the metal strip 1 runs in the direction of the arrow X as shown in FIG.
is installed at a position downstream of the wiping roll 2 and corresponding to each position of the unit backup roll 4, and the film thickness of the rolling oil, that is, the infrared transmittance is measured. In this way, the metal strip 1 running at 40 m/min after rolling
Figure 7, which plots the results obtained by measuring the film thickness of rolling oil at each measurement point in the half width of one side in the wiping state, shows that the film thickness of rolling oil is thinner in the center and edges in the width direction. It showed an uneven distribution, with some of the quotas being thicker.

From this wiping state, for example, when the pressing force of the unit backup roll 4 located at the center of the width of the metal strip 1 is reduced by adjusting the individual pressing means 8, the film thickness of the rolling oil in that area becomes It increased as shown in Figure 8. This shows that the thickness of the rolling oil film can be increased or decreased by adjusting the pressing force of each unit backup roll 4.

That is, in the method of the present invention, on the one hand, an individual pressing means 8 that can be remotely operated is installed for each unit backup roll 4 constituting the backup roll row 3, and on the other hand, the unit backup roll is pressed downstream of the wiping roll 2 after wiping. By measuring the film thickness, that is, the permeability, of the rolling oil in the area corresponding to each position of 4, and adjusting the pressing force of the unit backup roll 4 based on the results, the film thickness of the rolling oil can be made uniform in the width direction. The wiping roll pressure is controlled so that the The adjustment of the pressing force of each of the unit backup rolls 4 listed above is performed in combination with the adjustment of the pressing force of the entire backup roll row 3 by the pressing means 7 for the whole.

Cold rolling can be carried out by running the metal strip in only one direction, or by installing winders 19 on both sides of the rolling mill main body 18 as shown in FIG. Use it as a deflector, attach the metal strip coil 20, and attach the metal strip 1 as a deflector.
It is often carried out by a reverse method in which the material is made to run through the rolls 21 and rolled, then wound up on the other winder 19, and when finished, is made to run in the opposite direction and repeat the rolling. in this case,
As shown in FIG. 3, roll wipers 22 are installed on both sides of the rolling mill main body 18, and therefore, devices for measuring the film thickness, that is, the transmittance, of rolling oil using an infrared method are also installed on both sides accordingly. In the example, sensor 17
It is sufficient to measure the film thickness, that is, the permeability, of the rolling oil by providing them at the positions on both sides shown in FIG. 3 and using them alternately depending on the reverse direction.

In the method of the present invention, it is possible to easily manually adjust the pressing force of the unit backup roll 4 in accordance with changes while monitoring the measurement results of the film thickness, that is, the transmittance, of this rolling oil by the above-mentioned infrared method. By connecting and automating these using existing computer-based technology, it is possible to minimize the film thickness of rolling oil remaining on the metal strip surface and to wipe the entire surface evenly and evenly. This is preferable in terms of reliability and responsiveness.

〔Effect of the invention〕

As described in detail above, the wiping roll pressure control method according to the present invention makes it possible to remotely control the pressing means for adjusting the pressing force of the unit backup roll on the register corresponding to each position of the unit backup roll, and On the downstream side of the rolls, the film thickness of the rolling oil on the running metal band surface is measured using an infrared method for each of the above-mentioned rolls, and the pressing force of the unit backup roll is adjusted for each recording based on the measurement results. The following effects can be obtained.

1.Even if the conditions such as metal type, plate thickness, shape, etc. change, the film thickness of rolling oil on the metal strip surface can be wiped evenly and evenly to a predetermined thickness, reliably and easily. can.

2. Fluctuations in the film thickness of rolling oil during rolling or operation can be corrected immediately and continuously while rolling and operation continue.

Therefore, 3. It is possible to prevent various quality problems and operational troubles caused by poor wiping, 1. contamination of the working environment, and shortening of the life of the mount that is wrapped around the metal strip coil.

4. Since the film thickness of rolling oil can be made uniform, it is particularly effective in rolling extremely thin materials. It is possible to prevent the occurrence of a defective winding shape in which the shape of the winding coil becomes bamboo saw, which is likely to occur when a mount is not inserted during winding of this ultra-thin material.

[Brief explanation of drawings]

FIG. 1 is a side explanatory view of one example of a roll wiper in which the method of the present invention is implemented, FIG. 2 is a front explanatory view of another example of the roll wiper, and FIG. 3 is a roll wiper in which the method of the present invention is implemented. 4 is a principle diagram of an infrared transmission type film thickness measurement method, Figure 5 is an infrared absorption spectrum diagram of an example of rolling oil, and Figure 6 is an infrared transmission type membrane diagram. A comparison diagram of the film thickness measurements of rolling oil by the thickness measurement method and the gravimetric method. Figure 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. Figure 8 is a diagram showing the thickness distribution of rolling oil in the width direction of the metal strip after wiping. It is a figure which shows an example of the relationship between roll pressure and 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...Body frame 6a...Scraper 7...Overall pressing means 8...Individual pressing means 8a...Point of action 9...Infrared light emission Body 10... Lens ii... Interference filter 12... Light source tube 13... Photoelectric element 14... Amplifier 15... AD converter 16... CPU 17. ... Sensor 18 ... Rolling machine main body 19 ... Winding machine 20 ... Metal band coil 21 ... Deflector roll 22 ... Roll wiper X ... Metal band Traveling direction Patent applicant: Nissin Steel Corporation Mitsubishi Heavy Industries, Ltd. Figure 5 Figure λ (Absorption spectrum of rolling oil λ (μm) Figure Film thickness of rolling oil measured by infrared method (μm)) figure

Claims (1)

[Claims] 1. A pair of wiping rolls (
2) and a backup roll row (3) in which a plurality of short unit backup rolls (4) are linearly arranged in each row of at least one row arranged behind each wiping roll (2). ) and pressing means for pressing the backup roll row (3) toward the wiping roll (2). When wiping is performed by adjusting the pressing force of each unit backup roll (4) so that it is even, an individual pressing means (8) is provided for each unit backup roll (4) as a pressing means so that it can be remotely controlled. , Running metal strip after wiping (1)
Based on the results obtained by measuring the transmittance of the infrared rays in the projection/reflection path on the surface of the unit backup roll (4) in each region corresponding to each position on the downstream side of the wiping roll (2), A method for controlling wiping roll pressure, comprising adjusting the pressing force of a unit backup roll (4) for each region. 2. The method for controlling wiping roll pressure according to claim 1, wherein two rows of backup roll rows (3) each having the same number of unit backup rolls (4) arranged side by side are used. 3. The method for controlling wiping roll pressure according to claim 1, wherein one row of backup rolls is used as the backup roll row (3). 4. The wiping according to any one of claims 1 to 3, wherein the backup roll shaft (4a) is separated between each unit backup roll (4) and used as the backup roll row (3) so that the backup roll shafts (4a) are mutually independent. How to control roll pressure. 5 As a backup roll row (3), all unit backup rolls (4) are connected to the backup roll axis (4a
4. The wiping roll pressure control method according to claim 1, wherein a common long roll axis is used as the wiping roll pressure.