JP2016049522A - Cleaning method and cleaning device for rolling mill roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method and a cleaning device for a rolling mill roll, enabling foreign matter on the surface of the rolling mill roll to be surely removed and surface roughness of the rolling mill roll to be maintained.SOLUTION: The cleaning method for a rolling mill roll includes a measurement step, a setting step and a cleaning step. In the measurement step, a cavitation nozzle 41 is arranged at a position separated from a work roll 2 by a separation distance X, fluid for cleaning is jetted and a cleaning area width W in the shaft direction on the surface of the work roll 2 is measured. In the setting step, an axial direction-movement speed of the cavitation nozzle 41 is calculated based on the cleaning area width W, a diameter of the work roll 2 and a line feeding speed of a workpiece and a cleaning mode is set. In the cleaning step, the fluid is jetted toward the work roll 2 to clean the work roll while the cavitation nozzle 41 is moved in the axial direction in accordance with the set cleaning mode.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rolling roll cleaning method and a cleaning apparatus.

  In a continuous hot dip galvanizing line or the like, a galvanized steel sheet is rolled with a work roll, and temper rolling is performed to impart an appropriate steel sheet roughness to the galvanized surface. In such a temper rolling mill, when a galvanized steel sheet is rolled, when a part of the galvanized layer is peeled off and foreign matter such as zinc powder is generated, the foreign matter has unevenness to give the steel sheet roughness. It adheres to the surface of the formed work roll, and foreign matter such as zinc powder accumulates in the recesses, resulting in a decrease in the surface roughness of the work roll and clogging. If the work roll is clogged, the hot-dip galvanized steel sheet after temper rolling cannot be provided with the necessary steel sheet roughness, ensuring the required press formability and sharpness when used as a member for automobiles. Disappear. For this reason, conventionally, a cleaning method has been used that removes foreign matter such as zinc powder by rubbing the surface of the work roll using a contact-type cleaning brush or the like, but in this case, the surface of the work roll is shaved. There was a problem that the surface roughness was lowered.

Therefore, a cleaning method has been proposed in which foreign matters are removed while maintaining the surface roughness of the work roll in a predetermined state (see, for example, Patent Documents 1 to 3).
The temper rolling mills described in Patent Documents 1 and 2 include a cleaning nozzle facing away from the surface of the work roll by a predetermined distance, and a high pressure fluid is sprayed from the cleaning nozzle onto the surface of the work roll. Is configured to blow off and remove foreign matter. Examples of the high-pressure fluid used in such a cleaning apparatus include rolling oil, air, oil mist, hot water and the like.
Moreover, the temper rolling mill described in Patent Document 3 suppresses foreign matter from adhering to the surface of the work roll by rolling after applying a rust preventive oil to the surface of the galvanized steel sheet to be rolled. It is intended to maintain the surface roughness of the work roll.

On the other hand, unlike the cleaning nozzles such as those in Patent Documents 1 and 2, a cleaning method using an air cavitation jet has been proposed (for example, see Patent Document 4).
The cleaning method described in Patent Document 4 injects a high-pressure water stream from the center of the nozzle and injects a low-pressure water stream from the periphery thereof to cause a cavitation phenomenon at the collision position, and the object is cleaned by this cavitation. To do. Compared with the cleaning method using the high-pressure fluid described in Patent Documents 1 and 2, such a cleaning method using an air cavitation jet has a high cleaning effect even if the pressure on the high-pressure water stream side is not so high. There is an advantage that it is obtained.

However, in the cleaning method using the high-pressure fluid described in Patent Documents 1 and 2, the cleaning ability is not sufficiently enhanced due to the limit of the pressure of the fluid, and foreign matters such as zinc powder deposited in the recesses on the surface of the work roll On the other hand, if the pressure of the fluid is increased too much, the surface of the work roll is scraped and the surface roughness is impaired. Furthermore, since a high-pressure fluid is constantly ejected over the entire length of the work roll in the axial direction during rolling, a large amount of cleaning waste liquid containing the removed foreign matter is generated, and thus there is a problem that the processing cost of this cleaning waste liquid is high. is there.
Further, even in the method described in Patent Document 3, since it is necessary to constantly intervene rust preventive oil between the work roll and the galvanized steel sheet, a large amount of waste liquid is generated and the waste liquid treatment cost is high. There is.
On the other hand, since the method using the air cavitation jet described in Patent Document 4 is not for cleaning the work roll of the temper rolling mill, the cleaning method for obtaining the cleaning effect in the cleaning of the rolling roll Development was desired.

  In the rolling roll cleaning apparatus described in Patent Document 5, in order to clean the zinc adhering to the surface of the work roll while maintaining the surface roughness of the work roll, the separation distance X between the tip of the cavitation nozzle and the surface of the work roll Is 30 mm or more and 100 mm or less, the pressure PH of the high-pressure fluid ejected from the cavitation nozzle is set to 20 MPa or more and 40 MPa or less, and the pressure PH of the high-pressure fluid is set to satisfy PH ≦ 0.375X + 25. . For this reason, by generating air cavitation on the surface of the work roll by separately ejecting the high-pressure fluid and the low-pressure fluid from the cleaning nozzle, a higher cleaning power can be obtained than simply injecting only the high-pressure fluid. Foreign matter on the surface of the roll can be reliably removed. Furthermore, the roughness X of the surface of the work roll is maintained by setting the separation distance X between the tip of the cleaning nozzle and the surface of the work roll and the pressure PH of the high-pressure fluid within a range in which a high cleaning effect can be obtained. Can efficiently remove foreign matters.

JP 2003-285114 A Japanese Patent No. 3039895 JP 2005-152935 A JP 2003-62492 A Japanese Patent No. 5433794

When cleaning is performed using the rolling roll cleaning device described in Patent Document 5, the cavitation nozzle is moved along the surface of the work roll.
By the way, the cleaning region width by the cavitation nozzle is not proportional to the separation distance between the cavitation nozzle and the work roll. For this reason, it is difficult to perform desired cleaning without cleaning unevenness or cleaning residue even when the cleaning nozzle is moved in the same manner as when using a cleaning nozzle that does not use cavitation.

  The objective of this invention is providing the cleaning method and washing | cleaning apparatus of a rolling roll which can remove the foreign material on the surface of a rolling roll reliably, and can maintain the surface roughness of a rolling roll.

  The rolling roll cleaning method of the present invention is a rolling roll cleaning method for cleaning a work roll used in a rolling mill with a cavitation nozzle, and the cavitation nozzle is disposed at a position away from the work roll by a predetermined distance. And a measurement step of ejecting a cleaning fluid from the arranged cavitation nozzle to the work roll, and measuring an axial cleaning region width on the surface of the work roll by the ejected fluid, and the measurement step. The axial movement speed of the cavitation nozzle is calculated based on the cleaning area width, the diameter of the work roll, and the line feed speed of the work to be rolled, and the cleaning operation of the cavitation nozzle is performed. In the setting step to set the specified cleaning mode and the setting step In accordance with the determined cleaning mode, while moving the cavitation nozzle in the axial direction at the axial movement speed, the fluid is ejected to the work rolls separated from the predetermined separation distance, and the surface roughness of the work rolls And a washing step for washing zinc adhering to the surface of the work roll while maintaining the above.

  According to the rolling roll cleaning method of the present invention, in the measuring step, the cavitation nozzle that is not proportional to the predetermined separation distance is measured by measuring the axial cleaning region width on the surface of the work roll by the cavitation nozzle. Therefore, it is possible to acquire the accurate cleaning area width. In the setting step, the axial movement speed of the cavitation nozzle can be calculated from the relationship between the measured cleaning region width, the work roll diameter, and the work line feed speed. Therefore, even when a cavitation nozzle is used, the cavitation nozzle can be moved at a moving speed suitable for cleaning based on the relationship between the cleaning region width of the cavitation nozzle and various conditions. Therefore, there is no cleaning unevenness and no cleaning residue, and foreign matters on the surface of the rolling roll can be reliably removed and the surface roughness of the rolling roll can be maintained.

In the rolling roll cleaning method of the present invention, in the measuring step, the first cleaning region width when the cavitation nozzle is disposed at a position away from the work roll by a first separation distance, and the work roll Measuring the second cleaning region width when the cavitation nozzle is disposed at a position away from the second separation distance which is closer than the first separation distance, and in the setting step, the first cleaning region width and The first axial movement speed of the cavitation nozzle is calculated on the basis of the diameter of the work roll and the line feed speed, and the cavitation nozzle is washed away from the work roll at the first separation distance. The first cleaning mode is set as a mode, and the second cleaning region width, the diameter of the work roll, the line feed speed, And calculating a second axial movement speed of the cavitation nozzle, setting a second cleaning mode as a cleaning mode by the cavitation nozzle in a state of being separated from the work roll by the second separation distance, and the cleaning step Then, it is possible to select any one of the first cleaning mode and the second cleaning mode, and it is preferable to clean the work roll according to the selected one cleaning mode.
According to such a configuration, for example, during normal operation, the first cleaning mode in which the fluid is ejected from the cavitation nozzle located at a position away from the first separation distance longer than the second separation distance is selected, so that the cleaning power is excessively increased. The surface of the work roll can be quickly cleaned with a wide cleaning area width without increasing the thickness.
In addition, for example, when a foreign matter adheres to the surface of the work roll, cleaning is performed by selecting a second cleaning mode in which fluid is ejected from a cavitation nozzle at a position separated by a second separation distance shorter than the first separation distance. The surface of the work roll can be cleaned with a narrow cleaning area width by increasing the force.

In the rolling roll cleaning method of the present invention, it is preferable that in the cleaning step, the work roll is cleaned in accordance with the first cleaning mode, and the second cleaning mode can be switched based on the cleaning result.
According to such a configuration, it is possible to perform cleaning with high cleaning power in the second cleaning mode according to the degree of contamination of the surface of the cleaned work roll.
In addition, the cleaning result of the work roll is determined based on an element indicating the state of the surface of the work roll. Examples of this element include surface roughness, surface color, surface temperature, and foreign matter adhesion on the surface. These elements may be detected by a detection device including a surface roughness measuring device that detects the surface roughness of the work roll, an image processing device that detects the color of the surface of the work roll, and the like. Moreover, the element which shows the state of the surface of a work roll may be detected by an operator's visual observation.

In the rolling roll cleaning method of the present invention, the first cleaning mode is a cleaning mode for cleaning the entire axial region of the work roll, and the second cleaning mode is a part of the axial direction of the work roll. A cleaning mode for cleaning the region is preferred.
According to such a configuration, the entire work roll can be quickly cleaned in the first cleaning mode with a weak cleaning power and a wide cleaning area width. In addition, it is possible to reliably clean a partial region where the work roll is heavily contaminated in the second cleaning mode with a strong cleaning power and a narrow cleaning region width.

In the rolling roll cleaning method of the present invention, the first separation distance includes a long separation distance and a medium separation distance, and the first axial movement speed includes a long distance corresponding movement corresponding to the long separation distance. The first cleaning mode includes a long-distance cleaning mode corresponding to the long-distance distance and the long-distance-compatible moving speed, and the medium-distance separation distance. In addition, there is a medium-distance cleaning mode corresponding to the moving speed corresponding to the intermediate distance, and it is preferable that the long-distance cleaning mode and the intermediate-distance cleaning mode can be switched to each other.
According to such a configuration, for example, during normal operation, the work roll can be cleaned with a weak cleaning power in the long-distance cleaning mode. Can be cleaned with increased cleaning power.
Here, the medium-distance cleaning mode has a stronger cleaning power and a wider cleaning area width than the long-distance cleaning mode in relation to the characteristics of the cavitation nozzle, and has an excellent balance between the cleaning power and the cleaning area width. In the long-distance cleaning mode, a long separation distance is employed in order to obtain a weaker cleaning power than in the middle-distance cleaning mode. Note that the cleaning power in the intermediate cleaning mode is not as strong as the cleaning power in the second cleaning mode.

In the rolling roll cleaning method of the present invention, in the measurement step, the fluid is ejected from the cavitation nozzle to the axial end of the work roll located outside the region where the work roll is in contact with the work, It is preferable to measure the width of the cleaning region on the surface of the end portion in the axial direction of the work roll due to the ejected fluid.
According to such a configuration, only a part of the work roll in the region in contact with the work is not cleaned by the ejection of the fluid for measurement in the measurement step. For this reason, after the measurement in the measurement step, the area in contact with the work of the work roll can be cleaned uniformly without cleaning unevenness.

The rolling roll cleaning apparatus of the present invention is a rolling roll cleaning apparatus for using the above-described rolling roll cleaning method of the present invention, and jets a cleaning fluid to a work roll used in a rolling mill. A cavitation nozzle, a nozzle moving device that moves the cavitation nozzle along the surface of the work roll, and a control device that controls the operation of the cavitation nozzle and the nozzle moving device. The cavitation nozzle is disposed at a position apart from a predetermined separation distance, the fluid is ejected from the disposed cavitation nozzle to the work roll, and the surface of the work roll is cleaned by the ejected fluid in the axial direction. Measured with a measurement unit configured to measure the region width and the measurement unit Cleaning that regulates the cleaning operation of the cavitation nozzle by calculating the axial movement speed of the cavitation nozzle based on the cleaning area width, the diameter of the work roll, and the line feed speed of the work to be rolled In accordance with the setting unit configured to set the mode and the cleaning mode set in the setting unit, the work separated from the predetermined separation distance while moving the cavitation nozzle in the axial direction at the axial movement speed A cleaning unit configured to clean the zinc adhering to the surface of the work roll while ejecting the fluid to the roll and maintaining the surface roughness of the work roll.
According to the rolling roll cleaning apparatus of the present invention, the same effect as the above-described rolling roll cleaning method of the present invention can be exhibited.

In the rolling roll cleaning method and rolling roll cleaning apparatus of the present invention described above, the tip of the cavitation nozzle and the surface of the work roll are used for cleaning zinc adhering to the surface of the work roll while maintaining the surface roughness of the work roll. The pressure PH of the high-pressure fluid ejected from the cavitation nozzle is set to 20 MPa to 40 MPa and the pressure PH of the high-pressure fluid satisfies PH ≦ 0.375X + 25. It is preferable that it is set to.
According to such a configuration, a high-pressure fluid and a low-pressure fluid are separately ejected from the cleaning nozzle to generate air cavitation on the surface of the work roll, thereby providing a stronger cleaning power than simply injecting only the high-pressure fluid. And the foreign matter on the surface of the work roll can be reliably removed. Furthermore, the roughness X of the surface of the work roll is maintained by setting the separation distance X between the tip of the cleaning nozzle and the surface of the work roll and the pressure PH of the high-pressure fluid within a range in which a high cleaning effect can be obtained. Can efficiently remove foreign matters. That is, if the separation distance X is too short than 30 mm, the water sprayed from the nozzles will be scattered and bounced, preventing the occurrence of cavitation. If the separation distance X is too far from 100 mm, the work roll cleaning effect In order to increase the cleaning effect, higher pressure is required. On the other hand, from the relationship of the pressure with the ejection distance, foreign matter adhered to the surface of the work roll cannot be removed when the pressure is 20 MPa or less, and when the spray distance is between 30 mm and 100 mm, the surface of the work roll is scraped. As a result, the surface roughness of the work roll is reduced, and the roughness transferred to the steel sheet cannot satisfy the requirements, resulting in inconvenience in the post-treatment of the steel sheet. Therefore, the work roll needs to be replaced.

  According to the rolling roll cleaning method and cleaning apparatus of the present invention, it is possible to provide a rolling roll cleaning method and cleaning apparatus that can reliably remove foreign matters on the surface of the rolling roll and maintain the surface roughness of the rolling roll.

The structure schematic of the temper rolling mill which concerns on embodiment of this invention. Schematic which shows the washing | cleaning apparatus of the said temper rolling mill. The fragmentary sectional view which shows the washing nozzle of the said washing | cleaning apparatus. The expanded sectional view which shows the work roll of the said temper rolling mill. The graph which shows the setting range of the said washing | cleaning apparatus. The flowchart which shows the control by the control apparatus of the said temper rolling mill.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Configuration of temper rolling mill]
As shown in FIG. 1, the temper rolling mill 1 includes a pair of upper and lower work rolls 2, a backup roll 3 disposed above and below each work roll 2, and a cleaning device for cleaning the surface of the work roll 2. 4. The pair of work rolls 2 temper-roll the hot dip galvanized steel strip S supplied from the entry side (left side in FIG. 1) of the work roll 2 and send it out from the exit side (right side in FIG. 1). Is.

[Configuration of cleaning equipment]
The cleaning device 4 is for spraying high pressure fluid and low pressure fluid onto the surface of the work roll 2 to clean the surface. The cavitation nozzle 41, the high pressure fluid supply device 42, the low pressure fluid supply device 43, A nozzle moving device 44, a detecting device 45, and a control device 46 are provided. As shown in FIG. 1, the cavitation nozzle 41 is arranged on the exit side of each work roll 2, and is connected to the high-pressure fluid supply device 42 via the pipe P1, and is connected to the low-pressure fluid supply device 43 via the pipe P2. It is connected.

  The high-pressure fluid supply device 42 is for supplying a high-pressure fluid to the cavitation nozzle 41, and includes a cleaning fluid storage unit 421, a first pumping unit 422, and a first adjustment unit 423. The cleaning fluid storage unit 421 is a tank or a cylinder that stores cleaning fluid such as water or rolling oil, and is connected to the cavitation nozzle 41 by a pipe P1. The first pumping means 422 is a high-pressure pump, and is provided in the pipe P1, pressurizes the cleaning fluid supplied from the cleaning fluid storage means 421 and supplies it as a high-pressure fluid to the cavitation nozzle 41 under the control of the control device 46. . The first adjusting means 423 is, for example, a pressure regulator including a valve and a pressure gauge, and is provided on the first nozzle side of the first pressure feeding means 422 in the pipe P1. Further, for example, it is a pressure regulator that controls the pressure by controlling the rotation speed of the motor of the high-pressure pump that is the first pumping means 422. The first adjusting means 423 adjusts the supply amount and supply pressure of the high-pressure fluid delivered from the first pressure feeding means 422 under the control of the control device 46.

  The low-pressure fluid supply device 43 is for supplying a low-pressure fluid to the cavitation nozzle 41, and includes the cleaning fluid storage unit 421, the second pumping unit 432, and the second adjustment unit 433. In this embodiment, since the same cleaning fluid is used for the high-pressure fluid and the low-pressure fluid, the cleaning fluid storage means 421 described in the high-pressure fluid supply device 42 can be used. Therefore, the cleaning fluid storage unit 421 is also connected to the cavitation nozzle 41 by the pipe P2. When a cleaning fluid different from the high-pressure fluid is used as the low-pressure fluid, a storage means for storing a cleaning fluid for low-pressure fluid (not shown) is separately provided. The 2nd pumping means 432 is a low pressure pump, and is provided in the piping P2. The second pumping unit 432 pressurizes the cleaning fluid supplied from the cleaning fluid storage unit 421 and supplies the pressurized fluid to the cavitation nozzle 41 as a low-pressure fluid under the control of the control device 46. The second adjustment unit 433 is, for example, a pressure regulator including a valve and a pressure gauge, and is provided on the second nozzle side of the second pressure feeding unit 432 in the pipe P2. Further, for example, it is a pressure regulator that controls the pressure by controlling the number of rotations of the motor of the low-pressure pump that is the second pumping means 432. The second adjusting unit 433 adjusts the supply amount and supply pressure of the low-pressure fluid sent out from the second pumping unit 432 under the control of the control device 46.

  The detection device 45 detects the surface state of the work roll 2 and sends information corresponding to the detected surface state to the control device 46. Examples of the element indicating the surface state of the work roll 2 include surface roughness, surface color, surface temperature, foreign matter adhesion state on the surface, and the detection device 45 includes one or more surface state elements. Is detected. For example, when detecting the roughness of the surface of the work roll 2, the detection device 45 includes a surface roughness measuring device, measures changes in the surface roughness of the work roll 2, and foreign matter adheres to the recesses. Detects whether it has accumulated. For example, when detecting the color of the surface of the work roll 2, the detection device 45 includes an image processing device including a camera and an image analysis unit, and the surface color change due to the adhesion of the zinc powder Z or foreign matter is detected. Detect adhesion and so on. In addition, for example, when detecting the temperature of the surface of the work roll 2, the detection device 45 includes a non-contact temperature sensor, and whether the surface temperature is higher than the temperature at which the action of suppressing the adhesion of zinc powder works. Detect about.

  The control device 46 is connected to the detection device 45, the first adjustment means 423, the second adjustment means 433, the first pressure feeding means 422, the second pressure feeding means 432, and the nozzle moving device 44 via the electric wiring Cb. On the basis of the surface state of the work roll 2 detected in the above, the switching of the ejection state of the ejection material by the cleaning device 4, the pressure and flow rate of the fluid, and the position and oscillation of the cavitation nozzle 41 are controlled. Note that the detection device 45 is not limited to one configured by various devices, and the detection device may be configured by visual observation by an operator.

  As shown in FIG. 2, the cavitation nozzle 41 is attached to the nozzle moving device 44, and one cavitation nozzle 41 is arranged along the axial direction of the work roll 2. As illustrated in FIG. 3, the cavitation nozzle 41 includes a tubular first nozzle 411 and a tubular second nozzle 412 surrounding the first nozzle 411. The 1st nozzle 411 has the 1st jet nozzle 413 which can eject the high pressure fluid supplied from the high pressure fluid supply apparatus 42 in the front end side. The second nozzle 412 is provided so as to surround the first nozzle 411 in a concentric double tubular shape, and a second ejection port 414 capable of ejecting low-pressure fluid supplied from the low-pressure fluid supply device 43 is provided at the tip side thereof. Have. The pressure of the high-pressure fluid supplied to the first nozzle 411 is a size for generating an air cavitation jet, which will be described later, and is specifically 20 MPa or more and 40 MPa or less. The pressure of the low-pressure fluid supplied to the second nozzle 412 has a magnitude for generating an air cavitation jet, which will be described later, and is specifically 0.03 MPa or more and 0.07 MPa or less.

  The nozzle moving device 44 moves the cavitation nozzle 41 in the direction along the surface of the work roll 2 (the axial direction of the work roll 2), and the separation distance between the cavitation nozzle 41 and the work roll 2 under the control of the control device 46. The cavitation nozzle 41 is moved so as to change X. That is, as shown in FIG. 2, a nozzle support portion 441 that supports the cavitation nozzle 41, a nozzle moving lead screw 442 that passes through the nozzle support portion 441 and is screwed into the nozzle support portion 441, and the nozzle moving portion The cavitation nozzle 41 is moved along the axial direction of the work roll 2 by the drive unit 443 that rotates the lead screw 442 in the forward and reverse directions. On the other hand, the separation distance X can be changed by moving the cavitation nozzle 41 forward and backward toward the work roll 2 by an actuator 444 fixed to the nozzle support portion 441 and supporting the cavitation nozzle 41.

In addition to the control described above, the control device 46 includes a measurement unit 461, a setting unit 462, and a cleaning unit 463 as a configuration for controlling the movement of the cavitation nozzle 41. In the control device 46, the line feed speed VL of the workpiece and the separation distance X of the cavitation nozzle 41 are set to a predetermined speed and distance.
The measuring unit 461 is configured to measure an axial cleaning region width W (cleaning effective width, erosion width) by the fluid ejected from the cavitation nozzle 41 to the surface of the work roll 2 according to the separation distance X. Yes. As the separation distance X, three distances of a long separation distance X of about 100 mm, a medium separation distance X of about 65 mm, and a short separation distance X of about 30 mm are set.
The setting unit 462 calculates the axial movement speed of the cavitation nozzle 41 based on the measured cleaning region width W, and sets the cleaning mode that defines the cleaning operation of the cavitation nozzle 41 corresponding to each separation distance X. Has been. As the cleaning mode to be set, there are a long distance cleaning mode corresponding to the long separation distance X, a medium distance cleaning mode corresponding to the medium separation distance X, and a short distance cleaning mode corresponding to the short separation distance X.
The cleaning unit 463 can select any one of the set long-distance cleaning mode, medium-distance cleaning mode, and short-distance cleaning mode, and is configured to clean the surface of the work roll 2 according to the selected cleaning mode.

[Cleaning control by cleaning equipment]
Cleaning by the cleaning device 4 including such a control device 46 is controlled by the following procedure. Hereinafter, the cleaning procedure will be described with reference to the flowchart shown in FIG.
First, the cleaning region width W is measured based on the control in the measurement unit 461 (measurement step S1). Specifically, the separation distance X is separated in the radial direction from the measurement position WP at the end in the axial direction of the surface of the work roll 2 where the work roll 2 is located outside the surface area (outside the steel strip width) in contact with the work. The tip of the cavitation nozzle 41 is disposed at the position.
Here, since there are three separation distances X, that is, a separation distance X of about 100 mm, a medium separation distance X of about 65 mm, and a near separation distance X of about 30 mm, the cavitation nozzle 41 determines the three separation distances X. It will be placed three times at a distance. The order of arrangement at positions away from the long separation distance X, the medium separation distance X, and the short separation distance X is appropriately set.

  Next, a fluid is ejected from the cavitation nozzle 41 disposed at a position away from the measurement position WP of the work roll 2 to the measurement position WP of the rotating work roll 2 and detected from the detection device 45. Based on the result and the like, the cleaning region width W corresponding to the far separation distance X is determined. Further, a fluid is ejected from the cavitation nozzle 41 disposed at a position away from the measurement position WP by the medium separation distance X, and the fluid corresponds to the medium separation distance X based on the detection result from the detection device 45. The cleaning area width W is determined. Further, a fluid is ejected from the cavitation nozzle 41 arranged at a position away from the measurement position WP at the short distance X to the measurement position WP, and corresponds to the short distance X based on the detection result from the detection device 45 and the like. The cleaning area width W is determined.

The cleaning region width W corresponding to the far separation distance X is 42 to 44 mm, which is wider than the cleaning region width W (17 to 18 mm) corresponding to the near separation distance X. The cleaning region width W corresponding to the intermediate separation distance X is 40 to 42 mm, which is slightly narrower than the cleaning region width W corresponding to the far separation distance X and wider than the cleaning region width W corresponding to the near separation distance X. However, the cleaning region width W varies depending on the cavitation nozzle 41 and the separation distance X, the pressure PH of the high pressure fluid, and the pressure PL of the low pressure fluid.
The cleaning power by the fluid from the cavitation nozzle 41 located away from the long separation distance X can be set to a weak cleaning power compared to the case where the cavitation nozzle 41 is located apart from the medium separation distance X and the short separation distance X. . On the contrary, the cleaning power by the fluid from the cavitation nozzle 41 located away from the short distance X is set to a stronger cleaning power than the case where the cavitation nozzle 41 is located far from the long distance X and the middle distance X. Is possible. Further, the cleaning force by the fluid from the cavitation nozzle 41 located away from the intermediate separation distance X is higher than the case where the cavitation nozzle 41 is located away from the far separation distance X and the short separation distance X. Can be set.
The long separation distance X and the medium separation distance X constitute a first separation distance X that is longer than the near separation distance X, and the second separation distance X is constituted by a near separation distance X that is shorter than the first separation distance X. ing.
In the measurement step S1, the three cleaning region widths W corresponding to the long separation distance X, the medium separation distance X, and the near separation distance X are measured in this way.

Next, the cleaning mode is set based on the control in the setting unit 462 (setting step S2). Specifically, based on the number n of cavitation nozzles 41, the line feed speed VL of the work, the diameter R of the work roll 2, and each cleaning region width W measured in the measurement step S1, the following equation 1 is used. The axial movement speed Vt of the cavitation nozzle 41 is calculated, and the cleaning mode corresponding to each separation distance X is set.
[Formula 1]
Vt = {(W · n) · VL · 1000} / {πR · 60}
Vt (mm / sec): Axial moving speed of the cavitation nozzle (transverse speed)
W (mm): Cleaning area width (φ)
n: Number of cavitation nozzles VL (m / min): Workpiece line feed speed R (mm): Work roll diameter

  In addition, it is preferable from the viewpoint of cleaning efficiency that the wrap width in which the cleaning region width W overlaps in the axial direction is preferable from the viewpoint of cleaning efficiency. However, the width is not limited to this, and in consideration of the movement accuracy of the cavitation nozzle 41 and the cleaning characteristics with fluid, A lap width (lap (mm)) of about −2 mm may be set.

  Using the above-described equation 1, a long-distance corresponding movement speed Vt corresponding to the long-distance distance X, a medium-distance corresponding movement speed Vt corresponding to the medium-distance distance X, and a short-distance corresponding movement speed corresponding to the short-distance distance X. Vt is calculated. The long-distance cleaning mode with the long-distance distance X and the long-distance correspondence moving speed Vt as the conditions, the medium-distance washing mode with the medium-distance separation distance X and the medium-distance corresponding movement speed Vt as the conditions, A short-distance cleaning mode is set with the distance-corresponding movement speed Vt as a condition.

In the long-distance cleaning mode, the medium-distance cleaning mode, and the short-distance cleaning mode, the conditions of the cleaning area width W are different, but the conditions of the number n of the cavitation nozzles 41, the line feed speed VL of the work, and the diameter R of the work roll 2 are as follows. It is common.
The long-distance corresponding movement speed Vt and the medium-distance corresponding movement speed Vt constitute the first axial movement speed, and the short-distance correspondence movement speed Vt constitutes the second axial movement speed. Moreover, the first cleaning mode is configured by the long-distance cleaning mode and the middle-distance cleaning mode, and the second cleaning mode is configured by the short-distance cleaning mode.
In the setting step S2, three cleaning modes corresponding to the long separation distance X, the middle separation distance X, and the near separation distance X are set in this way.

Next, the surface of the work roll 2 is cleaned based on the control in the cleaning unit 463 (cleaning step S3). In the cleaning step S3, first, the surface of the work roll 2 is cleaned in the first cleaning mode, and the second cleaning is performed according to the detection state of the amount of foreign matter such as zinc powder Z on the surface of the work roll 2 by the detection device 45. Switch to mode (short-distance cleaning mode).
In the first cleaning mode, the cavitation nozzle 41 is disposed at a position away from the surface of the work roll 2 by the first separation distance X and on one end side in the axial direction of the work roll 2.
Which of the long-distance cleaning mode and the medium-distance cleaning mode is selected in the first cleaning mode is determined in accordance with the detection state of the amount of foreign matter adhered to the surface of the work roll 2 by the detection device 45. That is, when it is determined that there is almost no foreign matter adhesion amount on the surface of the work roll 2 based on the detection result by the detection device 45, the long-distance cleaning mode having a weak cleaning power is selected, and the foreign matter adhesion amount is zinc wound or the like. If it is determined that the medium exists, the medium distance cleaning mode is selected.

In the long-distance cleaning mode, the cavitation nozzle 41 is disposed at a position away from the surface portion located at one end portion of the rotating work roll 2 in the radial direction at a long separation distance X, and the work roll is removed from the arranged cavitation nozzle 41. 2 ejects fluid toward the aforementioned surface portion. Subsequently, the nozzle moving device 44 is operated to move the cavitation nozzle 41 in the axial direction at a long-distance movement speed Vt while the fluid is being ejected. When the cavitation nozzle 41 reaches the other end of the work roll 2, the movement of the cavitation nozzle 41 by the nozzle moving device 44 is stopped.
Thus, in the long-distance cleaning mode, the entire region (full width) from one end of the work roll 2 to the other end is cleaned.
In the long-distance cleaning mode, after the cavitation nozzle 41 reaches the other end of the work roll 2, the cavitation nozzle 41 is moved in the reverse direction to the one end of the work roll 2, and the cavitation nozzle 41 is pivoted. The mode is capable of reciprocating in the direction.

  In the medium-distance cleaning mode, the cavitation nozzle 41 is arranged at a position spaced apart from the surface portion located at one end of the work roll 2 that rotates the cavitation nozzle 41 in the radial direction, and the cavitation nozzle 41 is moved at a medium-distance corresponding speed. Except moving by Vt, it is set as the mode which wash | cleans the whole area | region of the work roll 2 like the long distance washing | cleaning mode mentioned above.

  The short distance cleaning mode is a mode in which a partial area in the axial direction of the work roll 2 is locally cleaned, unlike the entire area cleaning in the long distance cleaning mode and the medium distance cleaning mode. The short-distance cleaning mode is executed when a stronger cleaning power is required during the cleaning in the long-distance cleaning mode and the middle-distance cleaning mode. For example, when the detection device 45 finds a foreign matter stuck to a part of the surface of the work roll 2, it is determined that the foreign matter or the like cannot be removed based on the detection result (cleaning result) by the detection device 45, or the operator If a foreign object or the like is visually detected and the short-distance cleaning mode is selected by manually operating the control device 46, the long-distance cleaning mode or the intermediate-distance cleaning mode being executed is interrupted, and the short-distance cleaning mode is executed. The

In the short-distance cleaning mode, the cavitation nozzle 41 is disposed at a position that is radially away from the surface area of the work roll 2 where a strong cleaning power is required, and the work roll 2 is moved away from the arranged cavitation nozzle 41. The fluid is ejected toward the aforementioned surface region. Subsequently, the nozzle moving device 44 is operated to move the cavitation nozzle 41 in the axial direction at a short-distance corresponding moving speed Vt while the fluid is being ejected. This movement is a reciprocating movement in the aforementioned surface area of the work roll 2.
Thus, in the short distance cleaning mode, a partial region of the work roll 2 is cleaned. When cleaning in the short-distance cleaning mode eliminates the need for strong cleaning power (when the detection device 45 no longer detects dirt (the foreign object has been removed) or when it is no longer possible to visually confirm the foreign object) The short-distance cleaning mode ends, and the interrupted long-distance cleaning mode or intermediate-distance cleaning mode is executed again.

[Description of cleaning method]
Next, a method for cleaning the work roll 2 based on control by the control device 46 will be described.
As described above, measurement by the measurement unit 461 and setting by the setting unit 462 are performed, and then cleaning by the cleaning unit 463 is performed.
As shown in FIG. 3, a cavitation jet is formed and sprayed onto the surface of the work roll 2 by ejecting the high pressure fluid from the first nozzle 411 while ejecting the low pressure fluid from the second nozzle 412 of the cavitation nozzle 41. . At this time, the distance X between the tip of the cavitation nozzle 41 and the surface of the work roll 2 is appropriately adjusted by the actuator 444. Then, the nozzle support unit 441 is caused to travel along the axial direction of the work roll 2 by the drive unit 443 of the nozzle moving device 44, thereby cleaning the entire width of the work roll 2.

At the time of such cleaning, the control device 46 determines the separation distance X, the pressure PH of the high-pressure fluid ejected from the cavitation nozzle 41, and the low-pressure fluid based on the detection state of the foreign matter adhesion amount on the surface of the work roll 2 by the detection device 45. Adjust the pressure PL.
As shown in FIG. 4, the amount of foreign matter adhering to the surface of the work roll 2 detected by the detection device 45 may change the color of the surface of the work roll 2 due to the zinc powder Z being deposited in the recess 22 of the work roll 2. Detecting based on a change in height difference (roughness Ra1) between the convex portion 21 and the concave portion 22 of the work roll 2 or the like. That is, when the zinc powder Z is deposited on the concave portion 22 of the work roll 2, the work roll 2 itself is reduced from the roughness Ra1 to the roughness Ra2. Therefore, the roughness transferred to the galvanized steel strip S is reduced. Will be invited. Therefore, in order to remove the zinc powder Z accumulated in the recess 22, the control device 46 adjusts the separation distance X, the pressure PH of the high pressure fluid, and the pressure PL of the low pressure fluid as follows.

  The control device 46 controls the second adjusting means 433 to start the supply of the low-pressure fluid to the second nozzle 412 and also controls the first adjusting means 423 to start the supply of the high-pressure fluid to the first nozzle 411. The low-pressure fluid is ejected from the second ejection port 414 and the high-pressure fluid is ejected from the first ejection port 413 simultaneously. At this time, the pressure PH of the high-pressure fluid delivered from the first pressure feeding means 422 is controlled within the range of the graph shown in FIG. On the other hand, the pressure PL of the low-pressure fluid is controlled to 0.03 MPa or more and 0.07 MPa or less (center pressure PL = 0.05 MPa). In this way, the high pressure fluid and the low pressure fluid having different pressures and velocities are ejected simultaneously to form an air cavitation jet, which is sprayed onto the surface of the work roll 2. The bubbles contained in the air cavitation jet burst on the surface of the work roll 2, so that the impact pressure of the cleaning fluid is enhanced, and the foreign matter adhering to and depositing on the recesses can be removed with high cleaning power.

Here, as shown in FIG. 5, the relationship between the separation distance X and the pressure PH of the high-pressure fluid is first set in a range where the separation distance X is 30 mm or more and 100 mm or less, and the pressure PH of the high-pressure fluid is 20 MPa or more and It is set to 40 MPa or less. Further, the separation distance X and the pressure PH are set so as to satisfy the following expression (1).
PH ≦ 0.375X + 25 (1)
The above relationship between the separation distance X and the pressure PH of the high-pressure fluid is set based on an embodiment described later.

[Effects of Embodiment]
(1) By measuring the cleaning region width W in the axial direction of the cavitation nozzle 41 with respect to the work roll 2 in the measurement step S1, the actual cleaning region width W by the cavitation nozzle 41 can be accurately acquired. In the setting step S2, the axial movement speed of the cavitation nozzle 41 corresponding to each cleaning region width W can be calculated and set. For this reason, even when the cavitation nozzle 41 in which the separation distance X and the cleaning region width W are not in a proportional relationship is used, the cavitation nozzle 41 can be moved at a moving speed suitable for cleaning, and cleaning unevenness and cleaning residue are left. In addition, foreign matters on the surface of the work roll 2 can be reliably removed, and the surface roughness of the work roll 2 can be maintained.
(2) During normal operation of the temper rolling mill 1, by washing in the first washing mode (long-distance washing mode, medium-distance washing mode), it is wider than the short-distance washing mode without excessively increasing the detergency. The surface of the work roll 2 can be quickly cleaned with the cleaning area width W.
Further, when removing the foreign matter locally adhered to the surface of the work roll 2, the cleaning power is increased by cleaning in the second cleaning mode (short-distance cleaning mode), and the cleaning area width W is narrower than that in the first cleaning mode. Thus, the surface of the work roll 2 can be cleaned.
(3) The second cleaning mode can be selected according to the degree of contamination of the surface of the work roll 2 that can be acquired from the detection result of the detection device 45, and cleaning with high cleaning power can be performed.

(4) The entire work roll can be quickly cleaned by applying the first cleaning mode with a low cleaning power and a wide cleaning area width W. Further, a partial region where the work roll 2 is heavily contaminated can be reliably cleaned in the second cleaning mode having a high cleaning power and a narrow cleaning region width W.
(5) Since the first cleaning mode includes a long-distance cleaning mode and a medium-distance cleaning mode, the work roll 2 can be cleaned with a low cleaning power in the long-distance cleaning mode during normal operation of the temper rolling mill 1. For example, when zinc winding or the like occurs on the surface of the work roll 2, cleaning can be performed with an increased cleaning power in the medium distance cleaning mode.
(6) The measuring unit 461 is configured to measure the cleaning region width W by ejecting the fluid from the cavitation nozzle 41 to one end of the work roll 2 in the axial direction. It is possible to prevent only a part of the region in contact with the surface from being cleaned. Thereby, even immediately after the measurement of the cleaning region width W, the region in contact with the workpiece of the work roll 2 can be uniformly cleaned without cleaning unevenness.

(7) By setting the separation distance X to 30 mm or more, interference between the work roll 2 and the cavitation nozzle 41 can be prevented so as not to affect the rolling process itself, and cavitation caused by splashing of the scattered fluid can be prevented. It does not disturb the occurrence. By setting the separation distance X to 100 mm or less, it is possible to reduce the amount of fluid used by suppressing the scattering of the ejected fluid, and to reduce the cost for collecting and cleaning the fluid. When the pressure is between 20 MPa and 40 MPa, the cleaning function is not lowered. In addition, by setting the pressure PH of the high-pressure fluid to 20 MPa or more, it is possible to wash the adhered zinc, and further to ensure the cleaning effect, and by setting the pressure PH to 40 MPa or less, the scattering of fluid can be prevented. Further suppression is possible and the possibility of impairing the surface roughness of the work roll 2 can be reduced. Therefore, by generating air cavitation on the surface of the work roll 2, higher cleaning power can be obtained than when only the high-pressure fluid is jetted, and the foreign matter on the surface of the work roll 2 can be surely removed and separated. By appropriately setting the distance X and the pressure PH of the high-pressure fluid, foreign matters can be efficiently removed while maintaining the surface roughness of the work roll 2.

  As described above, according to the cleaning method using the cleaning device 4, foreign matters can be efficiently removed while maintaining the roughness of the surface of the work roll 2. Thus, the rolling efficiency of the temper rolling mill 1 can be increased. Therefore, the necessary galvanized steel sheet after temper rolling can be provided with the required steel sheet roughness, and galvanized to ensure the required press formability and sharpness when used as automotive parts. A steel plate can be manufactured efficiently.

[Modification]
In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation etc. in the range which can achieve the objective of this invention are included.
For example, in the embodiment, the first cleaning mode is configured by the long-distance cleaning mode and the intermediate-distance cleaning mode, but is not limited to this, and either one of the long-distance cleaning mode and the intermediate-distance cleaning mode The first cleaning mode may be configured only by this. In this case, the steps of setting the separation distance X corresponding to the other cleaning mode, measuring the cleaning region width W, and calculating the axial movement speed are omitted.

  In the embodiment, the long-distance cleaning mode and the medium-distance cleaning mode are switched according to the degree of contamination on the surface of the work roll 2, but the present invention is not limited to this. It may be switched according to various information such as. That is, when a cleaning mode to be applied corresponding to each piece of information such as the number of times of use of the work roll 2 and a use period is set in advance and each piece of information on the work roll 2 to be used is input, washing corresponding to each piece of information is performed. It may be switched to a mode.

A plurality (n) of the cavitation nozzles 41 described in the embodiment may be arranged in parallel and configured to be movable along the axial direction of the work roll 2. The interval between the plurality of cavitation nozzles 41 may be fixed or adjustable. Further, the interval between the plurality of cavitation nozzles 41 may be adjusted in correspondence with the separation distance X.
When fluid is ejected from such a plurality of cavitation nozzles 41, cleaning can be performed with a wide cleaning region width W in any cleaning mode compared with the case of cleaning with one cavitation nozzle 41, and cleaning efficiency can be improved. .

Moreover, the cleaning method and the cleaning apparatus of the present invention can be applied to a steel plate processing line (for example, a continuous annealing line) other than a continuous hot dip galvanizing line, and also to a roll of a rolling mill other than a temper rolling mill. Applicable. In addition, the cleaning method and the cleaning apparatus of the present invention can be applied to the removal of foreign matter on a rolling roll other than a work roll. Moreover, in a continuous hot dip galvanizing line, it is applicable also to washing | cleaning of the roll to which zinc powder Z adheres like a TOP roll downstream of a plating machine.
Moreover, in the said embodiment, although the washing nozzle is arrange | positioned at the work roll exit side, you may arrange | position to an entrance side and may arrange | position to another position, the installation position and the number of installation locations of a washing nozzle. Is not particularly limited.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
Here, using the temper rolling mill of the hot dip galvanizing line similar to the temper rolling mill 1 described in the above embodiment, temper rolling is performed under the following conditions, and the separation distance X and the pressure PH of the high-pressure fluid are set. As parameters, the number of work roll replacements, zinc winding removal force, and work roll roughness reduction were inspected and evaluated. The “conventional” in Table 1 is a cleaning method in which a foreign material such as zinc powder is removed by rubbing the surface of the work roll using a contact brush. Examples included in the scope of the present invention are shown in Table 1, No. 6-8, 11, 13-15, 18, 21, 22; 1 to 5, 9, 10, 12, 16, 17, 19, 20, 23 to 26 are comparative examples.
Galvanized steel sheet: board thickness 0.5mm-1.0mm x board width 1200mm-1600mm
Plating thickness: 140g / m2 to 220g / m2 (both sides)
Line speed: 110mpm ~ 150mpm
Rolling force: 250 to 400 tons
Separation distance X: 10 mm to 110 mm
Pressure PH of the high pressure fluid: 10 MPa to 50 MPa
Low pressure fluid pressure PL: 0.05 MPa

  As an evaluation method, first, the number of times the work rolls are exchanged is determined by taking one batch as a chance to produce a certain rolling amount (for example, galvanized steel sheet 3000 tons / 3 days) without changing the work rolls. Evaluate if you can. Next, when there is work roll replacement, evaluation is performed based on the number of replacements, and the lower the number of replacements, the better the evaluation. In addition, the zinc winding removal force means that the zinc powder accumulates in the recesses of the work roll when it is operated (zinc winding is generated), which means the removal force of this zinc winding (cleaning power). The greater the force, the better the evaluation. Furthermore, the cause of the decrease in the roughness of the work roll is that although the convex portion of the work roll is worn even by normal rolling (roughness is reduced), the convex portion is further worn by the cleaning, so that The lower the wear of the part, the higher the evaluation. In addition, in the conventional brush cleaning, since the convex portion is greatly worn (roughness is greatly reduced) by bringing the brush into contact with the surface of the work roll, the evaluation in Table 1 is x.

  As shown in Table 1, in the examples (Nos. 6 to 8, 11, 13 to 15, 18, 21, 22), it is unnecessary to replace the work roll for one chance (the number of replacements is 0). It has been found that the zinc winding removal force is large and the work roll roughness is less reduced. In particular, when the separation distance X is 30 mm, it can be seen that the higher the pressure PH of the high-pressure fluid, the higher the cleaning power and the higher the zinc winding removal power. Furthermore, in the condition where the separation distance X is 30 mm and the pressure PH is 20 to 40 MPa, a good cleaning power can be obtained, and the decrease in the roughness of the work roll is as small as in the other examples, which affects the work roll replacement. I understood that I would not. On the other hand, in the comparative example (No. 5, 9) in which the separation distance X is 30 mm, when the pressure PH of the high-pressure fluid is low, the zinc winding removal force is small, the cleaning ability is insufficient, and the pressure PH is high (40 MPa). Since the influence of the roughness of the work roll appears, it has been found that the number of work roll replacements increases and becomes inefficient and uneconomical.

From the above, no. In the case of 6 to 8, 11, 13 to 15, 18, 21, and 22, it is understood that the work roll replacement in one chance is unnecessary and a good cleaning effect is obtained, and it can be determined that these cleaning conditions are more preferable. .
On the other hand, No. which is a comparative example. In the case of 9, 12, the work rolls had to be replaced, and fluid scattering was also observed. Moreover, No. which is a comparative example. In the case of Nos. 5, 10, and 17, since the pressure PH of the high-pressure fluid is low, the cleaning ability is insufficient. In the case of 12, the cleaning ability is high, but the convexity on the surface of the work roll is worn and the roughness is greatly reduced, so that the number of work roll replacements increases. Further, the separation distance X is large (X = 110 mm). In the case of Nos. 24 and 25, the cleaning ability is insufficient. No. 26 has a cleaning effect, but it has been found that the equipment capacity increases and is not economical.

  Therefore, No. 1 which is an embodiment of the present invention. The separation distance X which is the cleaning condition of 6-8, 11, 13-15, 18, 21, 22 is 30 mm or more and 100 mm or less, the pressure PH of the high pressure fluid is 20 MPa or more and 40 MPa or less, and the above formula ( When 1) was satisfied, the cleaning ability and the effect of maintaining the surface roughness of the work roll were observed.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  DESCRIPTION OF SYMBOLS 1 ... Temper rolling mill, 2 ... Work roll, 4 ... Cleaning apparatus, 41 ... Cavitation nozzle.

Claims (7)

A rolling roll cleaning method for cleaning a work roll used in a rolling mill with a cavitation nozzle,
The cavitation nozzle is arranged at a position away from the work roll by a predetermined separation distance, a cleaning fluid is ejected from the arranged cavitation nozzle to the work roll, and the work roll is ejected by the ejected fluid. A measuring step for measuring the axial cleaning zone width on the surface;
Based on the cleaning area width measured in the measurement step, the diameter of the work roll, and the line feed speed of the work to be rolled, the axial movement speed of the cavitation nozzle is calculated, and the cavitation nozzle A setting step for setting a cleaning mode that regulates the cleaning operation of
In accordance with the cleaning mode set in the setting step, the fluid is ejected to the work rolls separated from the predetermined separation distance while moving the cavitation nozzle in the axial direction at the axial movement speed. A cleaning step for cleaning zinc adhering to the surface of the work roll while maintaining the surface roughness of the roll. In the cleaning method of the rolling roll of Claim 1,
In the measuring step,
A first cleaning region width when the cavitation nozzle is disposed at a position away from the first separation distance with respect to the work roll;
Measuring the second cleaning area width when the cavitation nozzle is disposed at a position away from the second separation distance which is closer to the work roll than the first separation distance;
In the setting step,
Based on the first cleaning area width, the diameter of the work roll, and the line feed speed, the first axial movement speed of the cavitation nozzle is calculated, and the first separation distance is separated from the work roll. A first cleaning mode is set as a cleaning mode by the cavitation nozzle in a state; and
Based on the second cleaning area width, the diameter of the work roll, and the line feed speed, a second axial movement speed of the cavitation nozzle is calculated, and the second separation distance is separated from the work roll. Set the second cleaning mode as a cleaning mode by the cavitation nozzle in the state of
In the washing step,
Either one of the first cleaning mode and the second cleaning mode can be selected, and the work roll is cleaned according to the selected one cleaning mode. . In the cleaning method of the rolling roll of Claim 2,
In the washing step,
The work roll is cleaned according to the first cleaning mode, and the second cleaning mode can be switched based on the cleaning result. In the cleaning method of the rolling roll of Claim 2 or Claim 3,
The first cleaning mode is a cleaning mode for cleaning the entire area in the axial direction of the work roll,
The second cleaning mode is a cleaning mode in which a partial region in the axial direction of the work roll is cleaned. In the cleaning method of the rolling roll according to any one of claims 2 to 4,
The first separation distance includes a long separation distance and a middle separation distance,
The first axial movement speed includes a long-distance correspondence movement speed corresponding to the long separation distance and a medium distance correspondence movement speed corresponding to the medium separation distance,
The first cleaning mode includes a long-distance cleaning mode corresponding to the long-distance distance and the long-distance corresponding movement speed, and a medium-distance cleaning mode corresponding to the medium-distance distance and the medium-distance corresponding moving speed,
The long-distance cleaning mode and the medium-distance cleaning mode can be switched to each other. In the cleaning method of the rolling roll according to any one of claims 1 to 5,
In the measuring step, the fluid is ejected from the cavitation nozzle to the axial end of the work roll located outside the region where the work roll is in contact with the work, and the work roll of the work roll is ejected by the ejected fluid. A method of cleaning a rolling roll, comprising measuring the width of the cleaning region on the surface of the end portion in the axial direction. A rolling roll cleaning device for using the rolling roll cleaning method according to any one of claims 1 to 6,
A cavitation nozzle that ejects a cleaning fluid to a work roll used in a rolling mill, a nozzle moving device that moves the cavitation nozzle along the surface of the work roll, and the operation of the cavitation nozzle and the nozzle moving device are controlled. A control device,
The controller is
The cavitation nozzle is arranged at a position away from the work roll by a predetermined separation distance, the fluid is ejected from the arranged cavitation nozzle to the work roll, and the surface of the work roll by the ejected fluid is A measuring section configured to measure the axial cleaning region width;
The axial movement speed of the cavitation nozzle is calculated based on the cleaning region width measured by the measurement unit, the diameter of the work roll, and the line feed speed of the work to be rolled, and the cavitation nozzle A setting unit configured to set a cleaning mode that regulates the cleaning operation of
In accordance with the cleaning mode set in the setting unit, the fluid is ejected to the work rolls separated from the predetermined separation distance while moving the cavitation nozzle in the axial direction at the axial movement speed. A cleaning device for a rolling roll, comprising: a cleaning unit configured to clean zinc adhering to the surface of the work roll while maintaining the surface roughness of the roll.

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