JPH02112811A - Shape control device for rolled sheet material - Google Patents

Abstract

PURPOSE:To control the shape of the rolled sheet material with good responsiveness over a wide range by controlling the injection rate of the high-temp. coolant on an inlet side according to rolling conditions and controlling the injection rate of the low-temp. coolant on an outlet side according to the detected shape of the rolled sheet material. CONSTITUTION:The high-temp. coolant C is injected to the roll gaps between work rolls 50 and the rolled sheet material S and the surfaces of the material S on the inlet side by nozzles 1, 2 for high temp. which are installed in may pieces in the axial direction of the rolls of the cold rolling device which rolls the material S by the work rolls 50, by which the above-mentioned material is cooled. The injection rate of the high-temp. coolant C is controlled according to the rolling conditions by a controller 23 for high temp. On the other hand, the many nozzle 3 for low temp. are disposed in the axial direction of the work rolls 50 and the low-temp. coolant Cc which is kept lower than the temp. of the above-mentioned high-temp. coolant C is injected to the surface of the work rolls 50 to cool the rolls. The injection rate of the low-temp. coolant Cc is controlled by a controller 34 for low temp. in accordance with the values detected by many pieces of shape detectors 59 disposed in the transverse direction of the material S, by which the thermal crown is corrected and the shape of the material S is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a shape control device for a rolled plate material (hereinafter referred to as a strip) in, for example, cold rolling, and more specifically, to a shape control device for controlling the shape of a rolled plate material (hereinafter referred to as a strip) in cold rolling.

Changes in the roll surface shape that occur on the work roll due to frictional heat between the roll and the material (hereinafter referred to as thermal crown)
) relates to thermal crown control that controls the influence of the rolling process on the rolled shape of the strip.

[Prior Art] In general, to control the shape of strips obtained by cold rolling, roll camber is achieved by changing the bending load of work rolls.
In addition to roll bending control, etc., which controls the
(Refer to Japanese Patent No. 169,611), an example of this type of thermal crown control device is shown in FIG.

In FIG. 4, S is a strip, and 50 is a strip S.
51 is a support roll, 52 is a take-up reel, and 53 is a coolant nozzle. A large number of the coolant nozzles 53 are arranged in the axial direction of the work roll 50, and the coolant C, which is water mixed with lubricating oil, is sprayed onto the work roll 50.
0, etc. The coolant nozzles 53 arranged in the axial direction communicate with a pump 57 via the same number of branch pipes 54 and flow control valves 55, and -1 supply pipes 56. This pump 57 sucks the coolant C in the tank 58 and supplies the coolant C to the coolant nozzle 53.
supply.

Shape detectors 59 are provided in large numbers in the width direction of the strip S, detect the shape of each part in the width direction of the strip S, and output the shape signal a to the shape signal processing bag M60. This processing device 60 compares a preset target shape with the shape signal a, and outputs the difference signal A to the flow rate control device 61. The flow rate control device 61 controls the flow rate of the coolant C to be injected from each coolant nozzle 53 based on the difference signal S, thereby adjusting the temperature of each part in the axial direction of the work roll 50, thereby controlling the temperature of the rolling processing heat. The change in roll diameter is controlled by

Thereby, a predetermined thermal crown is obtained and the shape of the strip S is controlled.

Coolant C injected from the coolant nozzle 53
is collected in the tank 58 via the water collection tank 64 and recycled for use. Here, the water content of the coolant C evaporates due to the heat of the rolling process, while the lubricating oil adheres to the strip S, etc., and is consumed. Therefore, a predetermined amount of water and lubricating oil are supplied to the tank 58 from the water supply pipe 62 and the oil supply pipe 63.
supplied within.

[Problems to be Solved by the Invention] As described above, thermal crown control cools the high-temperature work roll 50 with coolant C to control the shape of the strip S. By doing so, the amount of thermal crown correction and the responsiveness of control are improved. On the other hand, the coolant C not only cools the work roll 50 but also lubricates the space between the work roll 50 and the strip S to ensure rolling lubricity, so its temperature is generally 50°C to 60°C. is kept at a high temperature. Therefore, the temperature difference between the work roll 59 and the couch y) C is limited and small, so that the response of the control is slow and the amount of correction of the thermal crown is small.

As a countermeasure against this, in the above-mentioned prior art, instead of the 4M water pipe 62, a water nozzle is provided to inject and replenish the work roll 50 with water commensurate with the amount of loss due to evaporation, scattering, etc. cooling, improving control responsiveness,
The aim is to increase the amount of correction for thermal crowns. However, the amount of water lost is too small to carry out thermal crown control, and the controlled water amount is controlled by the liquid level in the tank 58, so sufficient effects cannot be obtained, and in addition, the controlled water amount fluctuates. It is necessary to add lubricating oil to coolant C according to the situation, but the response of the concentration control is extremely slow, so it cannot respond to changes in the control water amount, and as a result, the concentration of coolant C cannot be maintained at a constant value. A stable rolling condition cannot be obtained.

In addition, a shape control device is known that merges and injects two systems of low-temperature coolant and high-temperature coolant (for example, see Japanese Patent Laid-Open No. 62-84811). This shape control device controls the injection amount of the total coolant. Along with changing
By changing the mixing ratio of both coolants and changing the temperature of the mixed coolant, we aim to improve control responsiveness and increase the amount of thermal crown correction. However, since it is necessary to ensure rolling lubricity with a mixed coolant,
The temperature of the mixed coolant cannot be lowered that much, and therefore, a sufficient effect cannot be obtained.

This invention has been made in view of the above-mentioned conventional problems, and has better control responsiveness than the conventional one.

It is an object of the present invention to provide a shape control device for a rolled plate material that allows a large amount of thermal crown correction.

[Means for Solving the Problem] In order to achieve the above object, the invention of claim (1) of this application includes a work roll for rolling a rolled plate material, and a work roll arranged in a large number in the axial direction of the work roll. A high-temperature nozzle that injects high-temperature coolant onto the roll gap between the roll and the rolled plate material and the surface of the strip away from the work roll on the entry side, and a jet Q (ffl) of the high-temperature coolant injected from this high-temperature nozzle. A large number of high-temperature control valves are arranged in the axial direction of the work roll, and a high-temperature control device that controls the injection amount of high-temperature coolant by controlling the flow rate of high-temperature coolant in the high-temperature control valve according to rolling conditions. a low-temperature nozzle that injects a low-temperature coolant lower than the high-temperature coolant onto the surface of the work roll; a large number of low-temperature control valves that adjust the injection of the low-temperature coolant injected from each low-temperature nozzle; and the rolled plate material. A number of shape detectors are installed in the width direction of the rolled plate material to detect the shape of each part in the width direction of the rolled plate material and output a shape signal. A low-temperature control device is provided that controls the amount of low-temperature coolant injected from each of the low-temperature nozzles by giving an opening command or a valve opening/closing command.

Further, the invention of claim (2) provides a high-temperature nozzle in which a large number of high-temperature nozzles are arranged in the axial direction of the work roll to inject the high-temperature coolant into the roll gap between the work roll and the rolled plate material. It has a nozzle.

In addition to the invention of claim (1) or (2), the invention of claim (3) detects the actual rolling speed of the rolled plate material and sends the actual speed signal to the high temperature control device u. The high-temperature control device includes a speed detector for outputting an output, and includes a correction means for changing the injection amount of high-temperature coolant in accordance with the actual rolling speed.

[Effect] According to the invention of each claim of this application, first.

Since high-temperature coolant is injected into the roll gap to ensure rolling lubricity, the low-temperature coolant injected onto the surface of the work roll can only be used to cool the roll for thermal crown control, so its temperature can be lowered. Can be done. Furthermore, unlike the water that also serves as a supplement in the prior art described above, the low-temperature coolant does not change the concentration of the high-temperature coolant, so it is possible to increase the injection i1 of the low-temperature coolant. On the other hand, the injection of high temperature coolant
Since the amount of coolant is controlled according to the rolling conditions, the amount of high-temperature coolant injected into the roll gap can be reduced as much as possible, so the temperature of the work roll can be maintained relatively high.

In this way, the temperature of the low-temperature coolant can be lowered, and
Since the temperature of the work roll is kept high, it is possible to increase the temperature difference between the work roll and the low-temperature roller that cools the work roll and controls the thermal crown.
Moreover, since a large amount of low-temperature coolant can be injected, the work roll can be cooled quickly and significantly.

By the way, the work roll is also cooled to some extent by the high-temperature coolant injected into the roll gap, so if high-temperature coolant is injected onto the strip surface away from the work roll in addition to the roll gap, the high-temperature coolant injected into the roll gap will be Since the amount can be reduced, the temperature of the layer work roll can be maintained high.

In addition, if the injection amount of high-temperature coolant is changed in accordance with the actual rolling speed, the injection amount of high-temperature coolant can be kept to the necessary level and excessive supply can be prevented. Can be retained.

[Example] An example of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a first high temperature nozzle, 2 is a second high temperature nozzle, and 3 is a low temperature nozzle. The first high-temperature nozzle I injects high-temperature coolant C at about 50° C. to 60° C. only into the roll gap G between the work roll 50 and the strip S. The second high temperature nozzle 2 injects the high temperature coolant C only onto the surface of the strip S away from the work roll 50. On the other hand, the low-temperature nozzle 3 injects the low-temperature coolant CC, which is lower in temperature than the high-temperature coolant C, onto the surface of the work roll 50. Above 3
A large number of different types of nozzles 1, 2.3 are arranged in the axial direction of the work roll 50, as shown in FIG.

The first and second high temperature nozzles 1.2 each include a large number of branch pipes 10 and 20, and this branch pipe 10.2.
One distribution pipe 11 and 2 to which 0 is connected respectively
1 through the first and second high temperature control valves 12.22
is connected to.

The first and second high-temperature control valves 1222 are for adjusting the injection amount of high-temperature coolant) C injected from the first and second high-temperature nozzles 1.2, respectively. This is a flow control valve that changes the flow rate. Both high temperature control valves 12, 22 are in communication with the pump 57 via the main pipe to which the distribution pipe 11.21 is connected, as shown in FIG.

A low-temperature pipe 31 branches off from the main pipe 4.

A cooler 33 is inserted in the middle of the low-temperature pipe 31, and the cooler 33 cools the high-temperature coolant C to a predetermined temperature (for example, 35° C.) to become the low-temperature coolant CC. As shown in FIG. 2, the low temperature pipe 31 is divided into the same number of branch pipes 30 as the low temperature nozzles 3. Each branch pipe 30 is provided with a low-temperature control valve 32, and the low-temperature nozzle 3 is connected to the tip of the branch pipe 30.
is connected.

The low-temperature control valve 32 adjusts the amount of low-temperature coolant Cc injected from each low-temperature nozzle 3. In the case of this embodiment, the low temperature control valve 32 is ON/OFF.
OFF valve, ON-OFF from low temperature control device 34
In response to the (valve opening/closing) command p, the flow rate of the low temperature coolant Cc per unit time is controlled.

The low temperature control device 34 includes the function processing device 35 in FIG.
．． Comparator 36. A target shape memory device 37 and a supply pattern controller 38 are provided. The function processing device 35 manually processes the shape signal a output from the shape detector 59, performs function processing on it, and outputs the actual shape function ε(χ) to the comparator 36 in FIG. 36 is the target shape function εO in FIG. 3 inputted from the target shape memory device 37.
(χ) is compared with the actual shape function ε(χ), and a local deviation signal Δε(e) corresponding to each low-temperature nozzle 3 is output to the supply pattern controller 38. This supply pattern controller 38
is the above 0N-OF corresponding to the above local deviation Δx(χ)
The F command is output to the low-temperature control valve 32, thereby controlling the flow rate of the low-temperature coolant flowing through each low-temperature control valve 32, and controlling the injection amount from each low-temperature nozzle 3.

Note that, in this embodiment, the shape detector 59 is constructed of a pressure sensor.

Reference numeral 23 indicated by a dashed line indicates a high temperature control device, which includes first and second arithmetic units 24 and 25, a correction means 26, and a supply amount controller 27. The first arithmetic unit 24 includes, for example, a process computer, and the rolling conditions include:
The input side plate thickness, input side plate width, outlet side plate thickness, outlet side plate width, deformation resistance, standard rolling speed, etc. of the strip S are input from the outside, and the basic supply amount of high temperature coolant C corresponding to these rolling conditions is calculated. The basic quantity signal C is outputted to the correction means 26. Further, the first calculation device 24 outputs a reference speed signal sl indicating the reference rolling speed to the second calculation device 25.

Reference numeral 28 on the right side is a speed detector, which is linked to, for example, the take-up reel 52, and detects the actual rolling speed (actual rolling speed) of the strip S by detecting the number of rotations of the take-up reel 52. The actual speed signal S2 is sent to the second arithmetic unit 25.
Output to. This second calculation device 25 inputs the reference speed signal sl and the actual speed signal S2, calculates the ratio of the actual rolling speed to the standard rolling speed, and outputs a correction signal d to the correction means 26.

The correction means 26 inputs the basic quantity signal C and the correction signal d, corrects the basic supply quantity to an amount proportional to the actual rolling speed, calculates a corrected supply quantity, and outputs a supply quantity signal of the high temperature coolant C. e is output to the supply amount controller 27. This supply amount controller 27 calculates the valve opening degrees of the two high temperature control valves 12° 22 from the supply amount signal e and outputs valve opening signals fl and f2 to both high temperature control valves 12° 22. . This results in
Rolling lubricity is ensured by controlling the flow rate of high temperature coolant in both high temperature control valves 12.22 and controlling the injection amount from both high temperature nozzles 1.2.

Note that 5 is an inlet side draining device, and 6 is an outlet side draining device, each of which is comprised of, for example, three draining rolls 5a and 6a. The rest of the structure is the same as that of the conventional example shown in FIG. 4, and the same or corresponding parts are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

Next, the operation of the configuration described in -[1] will be explained.

First, rolling conditions such as the entrance side thickness of the strip S and the reference rolling speed are manually set in the first calculation device 24. 1st above
The calculation device 24 calculates the basic supply amount of the high temperature coolant C corresponding to the manually set rolling conditions, and outputs the basic amount signal C to the correction means 26. On the other hand, the ratio of the actual rolling speed to the standard rolling speed is inputted from the second calculation device 25 to the correction means 26, and the basic supply amount is calculated by the correction means 26 in accordance with this ratio. The maximum injection amount of high temperature coolant is determined.

On the other hand, the low temperature control device 34 controls the target shape function εO(S)
and the real shape function Lc/(χ), and calculate the local deviation Δε(
[chi]] and controls the low temperature control valve 32 shown in FIG. 3, which has a cooling zone for the work roll 50 corresponding to each local area. Through this control, a required amount of low-temperature coolant FCC is injected to each local part of the work roll 50, and as is well known (see, for example, Japanese Patent Laid-Open No. 169611/1983), the portion where a thermal crown is generated is cooled and the thermal Crown control is performed.

In the above configuration, the high temperature coolant C shown in FIG. 1 is injected onto the roll gap G and the surface of the strip S to ensure rolling lubricity. Therefore, work roll 5
Since the low temperature coolant CC injected onto the surface of the roll can be used only for cooling the roll for thermal crown control, its temperature can be set low.

Moreover, unlike conventional systems, the carrier for thermal crown control is not replenishment water but low-temperature coolant CC, so the concentration of high-temperature coolant) C does not change.
Since the rolling state does not change, the injection amount of the low temperature coolant Cc can be increased.

Furthermore, since the injection amount of the low-temperature coolant CC is set to be large, if the temperature of the entire coolant system decreases, a heater may be installed in the tank 58 to balance the amount of heat.

On the other hand, since the high-temperature control device 24 controls the injection amount of the high-temperature coolant C according to the rolling conditions, the high-temperature coolant C
Since the amount of injection of high temperature coolant C is increased or decreased, the amount of injection of high temperature coolant C can be reduced within a range that can maintain rolling lubricity. Therefore, the work roll 5 due to high temperature coolant C
0 temperature drop is reduced, and the temperature of the work roll 50 can be maintained high.

In addition, high temperature coolant C is injected into the roll gap G.
However, in this embodiment, in addition to the roll gap G, a second coolant (C) is injected onto the surface of the strip S on the entry side away from the work roll 50. Since the high temperature nozzle 2 is provided, the amount of high temperature coolant c injected into the roll gap G can be reduced. Therefore, - layer, work roll 5
0 temperature can be maintained at a high temperature.

Furthermore, since the injection amount of high-temperature coolant C is increased or decreased in accordance with the increase or decrease in the actual rolling speed, it is possible to minimize the injection amount of high-temperature coolant.
The temperature of the work roll 50 can be kept high.

As mentioned above, since the temperature of the low temperature coolant Cc can be set low and the temperature of the work roll 50 can be kept high, the low temperature coolant Cc, which cools one work roll 50 and controls the thermal crown, and the work roll 50 Since it is possible to increase the temperature difference between and increase the injection amount of the low-temperature coolant Cc, the work roll 5o can be quickly and significantly cooled. Therefore, the responsiveness of the control is improved and the amount of correction of the thermal crown is increased.

By the way, in the above embodiment, the low-temperature nozzle 3 was provided on the exit side of the strip S, but it may be provided on the entry side. Also, rolling can be applied not only in one direction but also in reversible rolling (bidirectional rolling). It goes without saying that this method can be applied regardless of the roll configuration of the rolling mill.

In addition, in this embodiment, 0N from the low temperature control device 34
-OFF command, the flow rate of the low-temperature coolant Cc was controlled; however, this flow rate control was performed by using the low-temperature control valve 32 as a flow rate adjustment valve, and sending the valve opening command from the low-temperature control device 34 to the low-temperature control valve 32. The injection amount may be controlled by outputting to

[Effects of the Invention] As explained above, according to the inventions of the claims of this application, the injection amount of low-temperature coolant can be increased and the temperature difference between one work roll and the low-temperature coolant can be widened, so that control can be improved. The responsiveness is improved and the amount of correction of the thermal crown is increased.

In particular, according to the invention of claim (1), since the amount of high-temperature coolant injected into the roll gap is further reduced, it is possible to improve responsiveness and increase the amount of correction.

Furthermore, according to the invention of claim (3), the amount of high-temperature coolant to be injected is also reduced, so that the responsiveness is further improved and the amount of correction is increased.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram showing an embodiment of the present invention, Fig. 2 is a schematic block diagram showing the main parts, Fig. 3 is a characteristic diagram showing a control method, and Fig. 4 is a diagram showing a conventional thermal crown control device. FIG. l...first high temperature nozzle, 2...second high temperature nozzle, 3...low temperature nozzle, 12...first high temperature control valve, 22...second high temperature nozzle control valve for use, 23...control device for high temperature, 26...correction means, 28...speed detector, 32...control valve for low temperature, 34...control device for low temperature, 50... Work roll, 59... shape detector,
C...high temperature coolant, Cc...low temperature coolant,
G middle roll gap, S... strip, a... shape signal, S2... actual speed signal. Figure 2 3V! J

Claims (3)

[Claims] (1) A work roll that rolls the rolled plate material, a large number of rolls arranged in the axial direction of this work roll, and a high temperature coolant in the roll gap between the work roll and the rolled plate material and on the surface of the rolled plate material on the entry side away from the work roll. A high-temperature nozzle that injects , a high-temperature control valve that adjusts the injection amount of high-temperature coolant injected from the high-temperature nozzle, and a high-temperature control valve that controls the flow rate of the high-temperature coolant in the high-temperature control valve according to rolling conditions. a high-temperature control device that controls the injection amount of the high-temperature coolant; a low-temperature nozzle that is arranged in large numbers in the axial direction of the work roll and injects a low-temperature coolant lower than the high-temperature coolant onto the surface of the work roll; A large number of low-temperature control valves that adjust the amount of low-temperature coolant injected from the nozzle, and shape detection devices that are provided in the width direction of the rolled plate material and detect the shape of each part in the width direction of the rolled plate material and output a shape signal. and the above shape signal as input,
A rolled plate material comprising: a low-temperature control device that controls the injection amount of low-temperature coolant from each of the low-temperature nozzles by giving a valve opening command or a valve opening/closing command to each of the low-temperature control valves based on the shape signal. shape control device. (2) In claim (1), instead of the high temperature nozzle, a large number of high temperature nozzles are arranged in the axial direction of the work roll and inject the high temperature coolant into the roll gap between the work roll and the rolled plate material. A shape control device for rolled plate material. (3) In claim (1) or (2), the high temperature control device includes a speed detector that detects the actual rolling speed of the rolled plate material and outputs an actual speed signal to the high temperature control device. A shape control device for rolled plate material comprising a correction means for changing the injection amount of high temperature coolant in accordance with the rolling speed.