JPH06102210B2 - Shape control device for rolled plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shape control device for a rolled sheet material (hereinafter referred to as “strip”) in cold rolling, for example, and more specifically, a plastic working heat by rolling, a roll The present invention relates to a thermal crown control for controlling the influence of a change in roll surface shape (hereinafter referred to as a thermal crown) generated on a work roll due to frictional heat between materials on a shape of a strip after rolling.

[Prior Art] Generally, in order to control the strip shape obtained by cold rolling, thermal crown control is performed in addition to roll bending control in which the bending load of a work roll is changed to control the roll chamber. (For example, JP-A-59-
169611). An example of this type of thermal crown control device is shown in FIG.

In FIG. 4, S is a strip, 50 is a work roll for rolling the 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 spray the coolant C, which is a mixture of water and lubricating oil, onto the work roll 50 and the like. Coolant nozzles lined up in the axial direction
53 is in communication with the pump 57 via the same number of branch pipes 54 and flow control valves 55, and one supply pipe 56. The pump 57 sucks the coolant C in the tank 58 and supplies the coolant C to the coolant nozzle 53.

A shape detector 59 is provided in a large number in the width direction of the strip S, detects the shape of each part in the width direction of the strip S, and outputs the shape signal a to the shape signal processing device 60.
This processing device 60 uses a preset target shape and shape signal a
And the difference signal b is output to the flow 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 on the basis of the difference signal b, thereby adjusting the temperature of each part in the axial direction of the work roll 50 so as to control the rolling heat. The change in roll diameter due to is controlled. As a result, a predetermined thermal crown is obtained and the shape of the strip S is controlled.

Coolant C sprayed from the above coolant nozzle 53
Is collected in the tank 58 through the water collecting tank 64 and is recycled. Here, in the coolant C, the water content is evaporated by the heat of the rolling process, while the lubricating oil is attached to the strip S or the like and consumed. Therefore, a predetermined amount of water and lubricating oil are supplied into the tank 58 from the water supply pipe 62 and the oil supply pipe 63.

[Problems to be Solved by the Invention] As described above, in the conventional thermal crown control, the high-temperature work roll 50 is cooled by the coolant C, and the strip S is removed.
Since the shape is controlled, the temperature of the coolant C is lowered to improve the thermal crown correction amount and the control response. On the other hand, Coolant C
In addition to cooling the work roll 50 and the like, the work roll 50 and the strip S must be lubricated at the boundary surface to ensure the rolling lubricity. Therefore, the temperature of the coolant C is generally 50%. It is kept at a high temperature of ℃ to 60 ℃. Therefore, the temperature difference between the work roll 50 and the coolant C is limited and small, so that the control response is slow and the correction amount of the thermal crown is small.

As a countermeasure against this, in the above-mentioned prior art, instead of the water supply pipe 62, the work roll 50 is replaced with water commensurate with the amount of loss such as evaporation and scattering.
A water nozzle for spraying and replenishing the work roll 50 is provided to cool the work roll 50 with low-temperature water to improve control responsiveness and increase the amount of correction of the thermal crown. However, since the amount of water loss is extremely small for performing thermal crown control, and the amount of control water is controlled by the liquid level of the tank 58, a sufficient effect cannot be obtained. Moreover, it is necessary to add the lubricating oil to the coolant C according to the fluctuating control water amount, but the response of the concentration control is extremely slow, so it is not possible to cope with the change in the control water amount, and as a result, the concentration of the coolant C is kept constant. A stable rolling state cannot be obtained because the value cannot be maintained.

Further, there is known a shape control device for injecting by combining two systems of a low temperature coolant and a high temperature coolant (for example, see JP-A-62-84811). This shape control device changes the injection amount of all the coolant and changes the mixture ratio of both coolants to change the temperature of the mixed coolant, thereby improving the control response and increasing the correction amount of the thermal crown. It is connected. However, since it is necessary to secure the rolling lubricity by interfacial lubrication between the work rolls and the strip with the mixed coolant, it is not possible to lower the temperature of the mixed coolant so much, and therefore a sufficient effect is also obtained. Can't get

The present invention has been made in view of the above circumstances,
Provided is a shape control device for a rolled sheet material, which can significantly improve control responsiveness while ensuring rolling lubricity, can increase a correction amount of a thermal crown, and can simplify the entire configuration. Is intended.

[Means for Solving the Problems]

In order to achieve the above object, the shape control device for a rolled sheet material according to the present invention includes a work roll for rolling the rolled sheet material, and a plurality of rolls arranged between the work rolls and the rolled sheet material arranged in the axial direction of the work roll. A high temperature nozzle for directly injecting high temperature coolant onto the surface of the rolled sheet material on the inlet side away from the gap and the work roll, a high temperature control valve for adjusting the injection amount of the high temperature coolant from this high temperature nozzle, and the rolled sheet material Of the high-temperature coolant corresponding to the rolling condition and the correction signal obtained by calculating the ratio of the actual rolling speed to the reference rolling speed by this speed detector. By inputting the basic quantity signal obtained by calculating the supply quantity and the flow rate of the high temperature coolant in the high temperature control valve, the high temperature from the high temperature nozzle is controlled. The high temperature control device for controlling the injection amount of the coolant, and the high temperature coolant by the cooler inserted in the middle of the low temperature pipe branching from the main pipe for supplying the high temperature coolant, which is arranged in the axial direction of the work roll. Low-temperature nozzles for injecting low-temperature coolant cooled to a predetermined temperature onto the surface of a work roll, a large number of low-temperature control valves for adjusting the injection amount of low-temperature coolant injected from each low-temperature nozzle, and the above-mentioned rolled plate material A number of shape detectors that detect the shape of each part in the width direction of the rolled plate and output a shape signal, and input the shape signal, and based on the shape signal, valve to each of the low temperature control valves. A low temperature control device for controlling the injection amount of the low temperature coolant from each of the low temperature nozzles by giving an opening degree command or a valve opening / closing command.

[Action]

According to the present invention, in addition to the high-temperature coolant injected into the roll gap between the work roll and the rolled plate material in order to secure the rolling lubricity between the work roll and the rolled plate material, the low-temperature coolant is applied to the surface of the work roll. It is possible to use the low-temperature coolant exclusively for roll cooling for thermal crown control by injecting. Further, as the low temperature cooling medium, a low temperature coolant obtained by cooling the high temperature coolant to a predetermined temperature by a cooler inserted in the middle of the low temperature pipe branched from the main pipe for supplying the high temperature coolant is used. Compared to the technology that uses water and lubricating oil as medium elements, the configuration for controlling the liquid level and concentration of the tank is not required, making it easier to simplify the overall configuration and changing the concentration of high-temperature coolant. Therefore, it is possible to increase the injection amount of the low temperature coolant sufficiently. On the other hand, as the control element of the injection amount of high temperature coolant, not only the rolling conditions such as the inlet plate thickness and plate width of the rolled plate material but also the actual rolling speed are taken into consideration. It is possible to reduce as much as possible within the range where the rolling lubricity is ensured, and to suppress the temperature decrease of the work roll due to excessive injection.

Thus, it is possible to increase the temperature difference between the low-temperature coolant and the work roll by keeping the temperature of the low-temperature coolant low and increasing the injection amount of the low-temperature coolant. The amount of correction of the thermal crown can be increased as well.

Furthermore, by directly injecting the high-temperature coolant also on the surface of the rolled sheet material on the inlet side away from the work roll, the plastic working heat remaining in the rolled sheet material provided by the rolling in the preceding stage or the preceding pass is reduced to It is possible to optimize the inlet temperature of the rolled sheet material, and therefore the amount of high-temperature coolant injected into the roll gap can be further reduced by that amount, and the temperature of the work rolls can be increased to control the response. And the amount of correction of the thermal crown can be further increased.

[Embodiment] An embodiment 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 1 injects the high temperature coolant S of about 50 ° C. to 60 ° C. only on the roll gear G between the work roll 50 and the strip S. The second high temperature nozzle 2 is
The high temperature coolant C is sprayed directly onto the surface of the strip G on the inlet side, which is separated from the work roll 50. On the other hand, the low temperature nozzle 3 injects a low temperature coolant Cc, which is lower in temperature than the high temperature coolant C, onto the surface of the work roll 50. As shown in FIG. 2, a large number of the three types of nozzles 1, 2, 3 are arranged in the axial direction of the work roll 50.

The first and second high temperature nozzles 1 and 2 are respectively
A plurality of branch pipes 10 and 20 and one branch pipes 11 and 21 to which the branch pipes 10 and 20 are respectively connected to communicate with the first and second high temperature control valves 12 and 12. There is. The first and second high temperature control valves 12 and 22 are respectively
The flow rate control valve adjusts the injection amount of the high temperature coolant C injected from the first and second high temperature nozzles 1 and 2, and is, for example, a flow rate control valve that changes the valve opening degree. The both high temperature control valves 12 and 22 communicate with the pump 57 through the main pipe 4 to which the distribution pipes 11 and 21 are connected, as shown in FIG.

A low temperature pipe 31 is branched from the main pipe 4. A cooler 33 is inserted in the middle of the low temperature pipe 31, and the high temperature coolant C is cooled to a predetermined temperature (for example, 35 ° C.) by the cooler 33 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 thereof.

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

The low temperature control device 34 includes a function processing device 35, a comparator 36, a target shape memory device 37 and a supply pattern controller 3 shown in FIG.
Equipped with 8. The function processing device 35 is the shape detector 5
The shape signal a output from 9 is input, and the function is processed to output the real shape function ε (χ) to the comparator 36 in FIG. The comparator 36 compares the target shape function εo (χ) of FIG. 3 input from the target shape storage device 37 with the actual shape function ε (χ), and the local part corresponding to each low temperature nozzle 3 is compared. The deviation signal Δε (χ) is output to the supply pattern controller 38. The supply pattern controller 38 uses the local deviation signal Δ
The N-FF command p corresponding to ε (χ) is output to the low temperature control valve 32, whereby the flow rate of the low temperature coolant flowing through each low temperature control valve 32 is controlled, and each low temperature nozzle 3 is supplied.
Control the injection amount from. In this embodiment, the shape detector 59 is composed of a pressure sensor.

Reference numeral 23 shown by a chain line is a high temperature control device,
The calculation devices 24 and 25, the correction means 26, and the supply amount controller 27 are provided. The first arithmetic unit 24 is composed of, for example, a process computer.
The input side plate thickness, the input side plate width, the output side plate thickness, the output side plate width, the deformation resistance and the standard rolling speed are input from the outside, and the basic supply amount of the high temperature coolant C corresponding to these rolling conditions is calculated, and the basic amount is calculated. The signal c is output to the correction means 26. Further, the first arithmetic unit 24 outputs a reference speed signal s1 indicating the reference rolling speed to the second arithmetic unit 25.

A speed detector 28 on the right side is, for example, interlocked with 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. , And outputs the actual speed signal s2 to the second arithmetic unit 25. The second arithmetic unit 25 receives the reference speed signal s1 and the actual speed signal s2 as input, calculates the ratio of the actual rolling speed to the reference rolling speed, and outputs the correction signal d to the correcting means 26.

The correction means 26 receives the basic amount signal c and the correction signal d as input, corrects the basic supply amount to an amount proportional to the actual rolling speed, calculates the corrected supply amount, and supplies the high temperature coolant C supply amount signal. e is output to the supply amount controller 27. The supply amount controller 27 determines the two high temperature control valves 12, 2 from the supply amount signal e.
2 calculates the valve opening and outputs the valve opening signal to both high temperature control valves 12 and 22.
Output f1 and f2. As a result, the flow rate of the high temperature coolant in the high temperature control valves 12 and 22 is controlled and the injection amount from the high temperature nozzles 1 and 2 is controlled, so that the rolling lubricity is ensured.

In addition, 5 is an entrance side draining device, 6 is an exit side draining device, and here, for example, each is composed of three draining rolls 5a, 6a. Other configurations are similar to those of the conventional example of FIG. 4, and the same portions or corresponding portions are designated by the same reference numerals,
The detailed description is omitted.

Next, the operation of the above configuration will be described.

First, rolling conditions such as the strip thickness on the entrance side of the strip S and the standard rolling speed are set and input to the first arithmetic unit 24. The first computing device 24 computes the basic supply amount of the high temperature coolant C corresponding to the rolling condition input as set and outputs the basic amount signal c to the correcting means 26. On the other hand, the second arithmetic unit 25
The ratio of the actual rolling speed to the standard rolling speed is
It is input to 26 and the basic supply amount is corrected by the correction means corresponding to this ratio.
Calculated in 26, the minimum amount of hot coolant injection required for lubrication is determined.

On the other hand, the low temperature control device 34 compares the target shape function εo (χ) with the actual shape function ε (χ), calculates the local deviation Δε (χ), and cools the work roll 50 corresponding to each local zone. It controls the low temperature control valve 32 of FIG. By this control, a required amount of the low temperature coolant Cc is injected to each local portion of the work roll 50, and as is well known (for example, Japanese Patent Laid-Open No. Sho 59-59).
No. 169611), the portion where the thermal crown is generated is cooled and thermal crown control is performed.

In the above structure, the high temperature coolant C shown in FIG. 1 is directly injected onto the surfaces of the roll gear G and the entrance strip S to ensure the rolling lubricity. Therefore,
Since the low temperature coolant Cc sprayed onto the surface of the work roll 50 can be used only for roll cooling for thermal crown control, the temperature can be set low.

Moreover, unlike the conventional case, the carrier for thermal crown control is not the replenishing water but the low temperature coolant Cc, so the concentration of the high temperature coolant C does not change. for that reason,
Since the rolling state does not change, the injection amount of the low temperature coolant Cc can be increased.

If the temperature of the entire coolant system drops due to the large injection amount of low-temperature coolant Cc,
A heater may be installed in the tank 58 to balance the amount of heat.

On the other hand, since the high temperature controller 24 controls the injection amount of the high temperature coolant C according to the rolling conditions, that is, the injection amount of the high temperature coolant C is increased or decreased in accordance with the increase or decrease of the strip thickness of the strip S or the like. Therefore, the injection amount of the high temperature coolant C can be reduced within a range in which the rolling lubricity can be maintained. Therefore, the temperature drop of the work roll 50 due to the high temperature coolant C is reduced, and the temperature of the work roll 50 can be kept high.

Further, the high temperature coolant C sprayed on the roll gear G
According to the present invention as well, the work roll 50 is cooled to some extent, whereas in the present invention, in addition to the roll gear G, the work roll 50 is
Since the second high temperature nozzle 2 for injecting the high temperature coolant C is provided directly on the surface of the strip S on the inlet side which is away from 50, the amount of the high temperature coolant C injected to the roll gear G can be reduced. Therefore, the work roll 50
The temperature of can be kept high.

Further, since the injection amount of the high temperature coolant C is increased / decreased according to the increase / decrease of the actual rolling speed, it is possible to minimize the injection amount of the high temperature coolant.
The temperature of the work roll 50 can be kept high.

As described 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 work roll 50 can be cooled by increasing the temperature difference between the low-temperature coolant Cc responsible for thermal crown control and the work roll 50, and the injection amount of the low-temperature coolant Cc can be increased. Can be cooled quickly and significantly. Therefore, the control response is improved and the correction amount of the thermal crown is increased.

By the way, in the above embodiment, the low temperature nozzle 3 is provided on the outlet side of the strip S, but it may be provided on the inlet side. Needless to say, the rolling can be applied not only to one direction but also to reversible rolling (bidirectional rolling), and further, regardless of the roll configuration of the rolling mill.

Further, in this embodiment, the N-
Although the flow rate of the low temperature coolant Cc was controlled by the FF command p, this flow rate control uses the low temperature control valve 32 as a flow rate control valve, and the low temperature control device 34 issues a valve opening command to the low temperature control valve 32. It may be output to control the injection amount.

[Effects of the Invention] As described above, according to the present invention, only the high temperature coolant is used as the cooling medium to simplify the overall structure, and the rolling lubricity between the work rolls and the rolled plate material is sufficient. It is possible to reduce the temperature of the low temperature coolant and increase the injection amount of the low temperature coolant while keeping the temperature of the work roll high to increase the temperature difference between the two. The responsiveness can be remarkably enhanced, and the correction amount of the thermal crown can be increased.

Moreover, by directly injecting the high-temperature coolant also on the surface of the rolled sheet material on the inlet side away from the work roll, the plastic working heat remaining in the rolled sheet material provided by the rolling in the preceding stage or the preceding pass is reduced and It is possible to optimize the inlet temperature of the rolled sheet material, and therefore the amount of high-temperature coolant injected into the roll gap can be further reduced by that amount, and the control responsiveness and thermal crown correction amount can be reduced. There is an effect that can be further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing essential parts, FIG. 3 is a characteristic diagram showing a control method, and FIG. 4 is a conventional thermal crown control device. It is a schematic block diagram which shows. 1 ... 1st high temperature nozzle, 2 ... 2nd high temperature nozzle, 3 ... low temperature nozzle, 12 ... 1st high temperature control valve,
22 …… Second control valve for high temperature, 23 …… Control device for high temperature, 26
...... Compensator, 28 ...... Speed detector, 32 ...... Low temperature control valve, 34 ...... Low temperature control device, 50 ...... Work roll, 59 ......
Shape detector, C ... High temperature coolant, Cc ... Low temperature coolant, G ... Roll gear tap, S ... Strip strip, a ...
… Shape signal, s2 …… Actual speed signal.

Claims (1)

[Claims] 1. A work roll for rolling a rolled sheet material, a large number of roll gaps arranged in the axial direction of the work roll, a roll gap between the work roll and the rolled sheet material, and a surface of the rolled sheet material on the inlet side separated from the work roll A high temperature nozzle that directly injects high temperature coolant, a high temperature control valve that adjusts the injection amount of high temperature coolant from this high temperature nozzle, and a speed detection that detects the actual rolling speed of the rolled plate and outputs the actual speed signal. And the correction signal obtained by calculating the ratio of the actual rolling speed to the reference rolling speed by this speed detector and the basic amount signal obtained by calculating the basic supply amount of high temperature coolant corresponding to the rolling conditions. A high temperature control device for controlling the injection amount of the high temperature coolant from the high temperature nozzle by controlling the flow rate of the high temperature coolant in the high temperature control valve; The surface of the work roll is a low-temperature coolant formed by cooling the high-temperature coolant to a predetermined temperature by a cooler inserted in the middle of the low-temperature pipe branched from the high-temperature coolant supply main pipe Nozzle for low temperature injection, a number of low-temperature control valves for adjusting the injection amount of low-temperature coolant injected from each low-temperature nozzle, a large number provided in the width direction of the rolled plate material of each portion in the width direction of the rolled plate material A shape detector that detects a shape and outputs a shape signal, and the shape signal is input, and based on the shape signal, each low temperature control valve is given a valve opening command or a valve opening / closing command, and each low temperature nozzle Control device for low temperature, which controls the injection amount of the low temperature coolant from the rolling mill.