JP2006312183A - Device and method for preventing melting of roll in dry temper rolling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable melting prevention device, and a melting prevention method. <P>SOLUTION: The melting prevention device is used for preventing the melting of the roll 2 constituting a dry temper rolling facility. The device is provided with a temperature measurement means, which measures a temperature at a measurement region 5 closely facing to a part along the roll axis line on the surface of the roll 2 with an infrared ray sensor, and a prediction means for predicting the melting of the roll 2 by using the temperature measured by the temperature measurement means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a roll melt damage prevention apparatus and melt damage prevention method in dry temper rolling, and more particularly, to a reliable melt damage prevention apparatus and melt damage prevention method.

The temper rolling is performed at the end of the cold rolling line with a rolling reduction of about several percent for the purpose of improving the mechanical properties and surface finish of the steel sheet after annealing and correcting the shape of the steel sheet. . In the temper rolling, dry temper rolling without using a lubricant / coolant is employed at many production sites because the surface of the steel sheet, which is a product, is disliked.
Conventionally, rolls (which is a collective term for work rolls, intermediate rolls, and backup rolls) are partially heated during dry temper rolling operations, and although the frequency of occurrence is rare, there is an accident that leads to roll melting. Was. Generally, in dry temper rolling, it is difficult to cool the rolls, and the frictional heat between the rolls or between the rolls and the metal powder increases, so that the rolls are easily melted. There are various reports on the mechanism of roll erosion, but it has not been fully elucidated.
When a roll erosion accident occurs, the temper rolling line is suspended and the roll needs to be replaced, which not only lowers the operating rate of the temper rolling line but also recovers molten metal and damages incidental equipment. A lot of labor is required to repair the department. In the worst case, a fire may be caused and a serious accident may be caused.

Attempts to prevent meltdown accidents have been made in the past, but it has been effective so far because it is extremely difficult to catch the precursors and partial heating of the roll proceeds in a short time. No preventive measures have been found.
Therefore, preventive measures that have been considered to prevent heating due to friction of the roll have been studied in the past, but it is difficult to adopt in terms of productivity and economy, and it is not possible to completely prevent a melting damage accident. It was. Further, in the wet temper rolling in which the roll is directly cooled with a lubricating oil or the like, although there is almost no erosion accident, the product surface is contaminated with the lubricating oil, so that there is a drawback that a troublesome cleaning process must be performed.

As methods that can be adopted to prevent the roll from being damaged, a method in which a material having high wear resistance or a material having high hardness is used as the material of the roll, and a method and apparatus for preventing or predicting the damage (for example, Patent Document 1). ) Has been proposed.
Japanese Patent Laid-Open No. 11-248604

In the technique disclosed in Patent Literature 1, a portion where roll melt damage is likely to occur is in a contact portion with other rolls in contact and the vicinity thereof, and in a contact state with other rolls in contact in the roll axial direction. It is assumed that the boundary portion changes from a contact state to a non-contact state and its vicinity. However, according to the researches of the present inventors, the portion that is easily damaged by roll disclosed in Patent Document 1 is superimposed with infrared rays emitted from other high-temperature portions or infrared rays reflected between adjacent rolls. Due to the error caused by the disturbance, the infrared sensor is difficult to measure accurately, and the surface of the roll is highly reflective. It has been found that there is a risk that reliability may be lowered.
For example, according to the study by the present inventors, the portion (roll contact portion) that is easily melt-dissolved disclosed in Patent Document 1 is apparently displayed at a higher temperature than the actual roll temperature in the thermoviewer image. The It was found that the infrared rays radiated from other high-temperature portions (roll chock portions) are superposed on this portion, so there are many disturbances and the accurate temperature is not shown.

  Further, even if a roll material having high wear resistance or high hardness is used, it has not been possible to sufficiently prevent melting damage.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a roll melt damage prevention apparatus and a melt damage prevention method that are excellent in reliability.

  The present inventor has intensively studied that when measuring the temperature of the surface of the roll with an infrared sensor, the measurement region is a region where a measurement error caused by disturbance generated by superposition of infrared rays is unlikely to occur. It has been found that the temperature of the surface of the roll can be accurately measured without contact.

 The melt damage prevention apparatus of the present invention is an apparatus for preventing melt damage of a roll constituting dry temper rolling equipment, and in order to solve the above-mentioned problem, the adjacent facing portion along the roll axis of the roll surface There are provided temperature measuring means for measuring the temperature of the measurement area in the infrared sensor with an infrared sensor, and prediction means for predicting roll erosion using the temperature measured by the temperature measuring means.

  Such a melting damage prevention apparatus is provided with temperature measuring means for measuring the temperature of the measurement region in the proximity facing portion along the roll axis of the roll surface with an infrared sensor, and thus is caused by disturbance generated by superimposing infrared rays. Measurement errors are unlikely to occur, and the temperature of the roll surface can be measured with high accuracy. For this reason, the melt damage of the roll can be predicted with high accuracy based on the temperature of the measurement region, and the reliability is excellent.

In the above-described melting damage prevention apparatus, the predicting unit compares the average temperature of the measurement region in the proximity facing portion along the roll axis with the management value determined in advance based on the tempering temperature of the roll. It is possible to predict the melting loss of the roll.
By setting it as such a melting prevention apparatus, it becomes possible to easily predict the roll melting with a predetermined accuracy based on a predetermined management value.

In the above melting damage prevention apparatus, the predicting means obtains a roll linear pressure by using a temperature difference in a measurement region at a close facing portion along the roll axis, and is based on the roll linear pressure and a roll deformation limit linear pressure. By comparing the control values determined in advance, it is possible to predict the roll melting damage.
By setting it as such a melt | dissolution prevention apparatus, the melt damage of a roll can be estimated with high precision by comparing the management value previously determined based on the roll linear pressure and the deformation | transformation limit linear pressure of a roll.

In the above melting damage prevention apparatus, the roll line pressure is obtained by using the temperature difference and the rolling load of the measurement region in the adjacent facing part along the roll axis, and based on the roll line pressure and the roll deformation limit line pressure in advance. By comparing the determined control values, it is possible to predict the melting damage of the roll.
By using such a melt damage prevention device, it is possible to determine the roll line pressure based on the temperature difference in the roll axis direction and the rolling load, and predict roll melt damage with high accuracy using the roll line pressure. it can.

Further, the above melting damage prevention apparatus can include a control means for controlling the rolling speed and the rolling load according to the result obtained by the prediction means.
By setting it as such a melting damage prevention device, for example, according to the result obtained by the predicting means being equal to or higher than a preset value of the roll linear pressure, the rolling speed is reduced, the rolling load Can be controlled to reduce the roll linear pressure and prevent melting damage.

In the above melting damage prevention apparatus, the temperature measuring means can be an infrared sensor having a function of displaying a surface temperature distribution of a roll as an object to be measured with an image. This infrared sensor is generally known as a trade name “thermoviewer”.
By setting it as such a melting damage prevention apparatus, the temperature difference of a measurement area | region can be measured easily. In addition, the temperature distribution measured by the temperature measuring means can be easily recognized.

Further, in the above melting damage prevention apparatus, a cover for shielding the roll is provided between the temperature measuring means and the roll, and the cover is provided at a portion located between the temperature measuring means and the measurement region. Windows are provided.
When measuring the temperature of the surface of a roll using an infrared sensor, an infrared sensor measures the infrared radiation power in the surface of a roll. At this time, when only the roll exists around the infrared sensor, the radiation power of the roll can be measured with high accuracy. However, in reality, an object other than the roll exists around and emits infrared rays in the same manner, and this influence causes a measurement error. In the above melting damage prevention apparatus, since the cover is provided, errors due to infrared radiation emitted from other than the measurement region can be reduced, and the temperature of the roll surface can be measured with higher accuracy. Is possible.

Further, in the above melting damage prevention apparatus, the dry temper rolling equipment is a so-called 6-roll rolling mill in which work rolls, intermediate rolls, and backup rolls are arranged above and below the material to be rolled, It is desirable that the temperature measuring unit measures the temperature in the measurement area of all rolls.
Since the temperature measurement object is the measurement region of all rolls, even if the tempering temperature and the deformation limit linear pressure are different for each roll, the melt damage of the roll can be predicted with high accuracy.

Moreover, in the above-described melting damage prevention apparatus, the roll of the dry temper rolling equipment is composed of a work roll, an intermediate roll, and a backup roll, which are respectively arranged above and below the material to be rolled, and the intermediate roll includes at least The cross-sectional shape of one end is provided with a shoulder formed by a curve, and the width of the measurement area of each roll is in the range of 1/20 to 1/50 of the diameter of each roll. The edge in the length direction of the measurement region is inside the position of the shoulder portion of the intermediate roll, and ¼ of the roll width of each roll from the position of the shoulder portion of the intermediate roll. It is located outside the inner position by the length of.
By setting it as such a melting prevention apparatus, the measurement error resulting from the disturbance which superimposes an infrared ray will become very difficult, and it will become possible to measure the temperature of the surface of a roll with still higher precision.

  In order to solve the above-mentioned problem, the melt damage prevention method of the present invention is a method for preventing melt damage of a roll constituting a dry temper rolling facility, and is a measurement at a close facing portion along the roll axis of the roll surface. A temperature measurement step of measuring the temperature of the region using an infrared sensor and a prediction step of predicting roll melt damage using the measured temperature are provided.

  In such a melting damage prevention method, the temperature measured by the temperature measuring means is less likely to cause a measurement error due to disturbance caused by the superposition of infrared rays, so the surface temperature of the roll can be accurately determined in the temperature measurement process. It is possible to measure. For this reason, it is possible to predict the melt damage of the roll with high accuracy in the prediction step.

Further, in the above-described melting damage prevention method, the prediction step compares the average temperature of the measurement region in the proximity facing portion along the roll axis and the management value determined in advance based on the tempering temperature of the roll, It can be a method for predicting roll melting.
Further, in the above-described melting damage prevention method, the predicting step obtains the roll linear pressure using the temperature difference of the measurement region in the adjacent facing portion along the roll axis, and is based on the roll linear pressure and the roll deformation limit linear pressure. By comparing the control values determined in advance, it is possible to make a method for predicting the melt damage of the roll.
Further, in the above-described melting damage prevention method, the predicting step obtains the roll linear pressure using the temperature difference and the rolling load of the measurement region in the adjacent facing portion along the roll axis, and the roll linear pressure and the roll deformation limit are obtained. By comparing the control values determined in advance based on the linear pressure, a method of predicting the melting damage of the roll can be obtained.

Further, in the above-described melting damage prevention method, the rolling speed and rolling load can be controlled according to the result obtained in the prediction step.
By adopting such a melting damage prevention method, the rolling speed is reduced or the rolling load is reduced according to the result obtained in the prediction process, thereby reducing the roll linear pressure and preventing the melting damage. It can be performed.

  According to the present invention, since the temperature of the measurement region in the proximity facing portion along the roll axis of the roll surface is measured by the temperature measuring means, the measurement accuracy is high and the prediction with excellent reliability can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of a peripheral portion of a roll constituting a dry temper rolling facility and a melting damage preventing apparatus of the present invention. In FIG. 1, the code | symbol 1 has shown the dry-type temper rolling equipment, the code | symbol 2 has shown the roll, and the code | symbol 3 has shown the to-be-rolled material. A dry temper rolling facility 1 shown in FIG. 1 is a 6-roll rolling mill in which a work roll 23, an intermediate roll 22, and a backup roll 21 are arranged as rolls 2 with a material 3 to be rolled interposed therebetween. Around the roll 2 of the dry temper rolling facility 1, there are a temperature measuring means 6, a cover 9 provided between the temperature measuring means 6 and the roll 2, a predicting means 7 for predicting melting damage of the roll 2, and a machine An anti-melting device having a side monitor 15 is arranged.
The machine-side monitor 15 is a monitor that is provided in the vicinity of the roll 2 and has a function of displaying a measurement visual field of the measuring means 6, a temperature measurement temperature range, a temperature image of the roll to be measured, and the like. The machine-side monitor 15 can be used at the time of equipment inspection in the vicinity of the roll 2, and the state of the roll 2 can be easily and quickly determined by grasping the state of the roll 2 using the output from the machine-side monitor 15. Therefore, it is possible to respond quickly to operations.

FIG. 2 is an enlarged configuration diagram of the material to be rolled 3 shown in FIG. 1, the roll 2 on the upper side of the material to be rolled 3, and its peripheral portion as viewed in the traveling direction of the material to be rolled. FIG. 3 is an enlarged configuration diagram of the material to be rolled 3 shown in FIG. 1, the roll on the upper side of the material to be rolled, and its peripheral portion as seen from the axial direction of the roll.
The backup roll 21, the intermediate roll 22, and the work roll 23 are connected to bearings (roll chock) 11, 12, and 13, respectively, and are rotatably supported around the roll axis 4.
Only one end of the intermediate roll 22 is shouldered to have a curved cross-sectional shape, and a shoulder 25 is formed.

  In this embodiment, the backup roll 21 has a diameter of 960 mm, a tempering temperature of 545 ° C., and a deformation limit linear pressure of 1833 kg / mm, and the intermediate roll 22 has a diameter of 460 mm, a tempering temperature of 210 ° C., and a deformation limit linear pressure. A work roll 23 having a diameter of 430 mm, a tempering temperature of 110 ° C., and a deformation limit linear pressure of 2570 kg / mm was used.

The temperature measuring means 6 is a thermoviewer and measures the temperature of the measurement region 5 shown in FIG. 2 in a non-contact manner at predetermined time intervals.
The measurement area 5 includes a measurement area 51 of the backup roll 21, a measurement area 52 of the intermediate roll 22, and a measurement area 53 of the work roll 23. As shown in FIG. 2, the measurement region 5 is a portion indicated by diagonal lines from the top to the bottom left when viewed along the traveling direction of the material 3 to be rolled, and is a strip-shaped region along the roll axis 4.
In the present invention, this region is defined as a “measurement region in a close facing portion along the roll axis” for convenience. When the temperature is measured using an infrared sensor such as a thermoviewer, the close facing portion means a curved surface area that is closest to the sensor side in a portion facing the sensor among the roll surfaces forming the curved surface. Hereinafter, the “measurement region in the proximity facing portion along the roll axis” is also simply referred to as a measurement region.

Since the measurement area 5 does not include the area A indicated by the mesh in FIG. 2 or the area B indicated by the oblique line from the top to the lower right, the error is not easily generated due to the superposition of infrared rays.
A region A shown in FIG. 2 is an edge region 26 of the roll 2 including the end surface of the roll 2 as shown in FIG. 3, and as shown in FIG. Due to the disturbance caused by the superposition, an error is likely to occur, and it is difficult to accurately measure the temperature.
Further, the region B shown in FIG. 2 is a contact portion with other adjacent rolls, and as shown in FIG. 4 to be described later, due to an error due to disturbance generated by superimposing infrared rays reflected between the adjacent rolls, This is the part where accurate temperature measurement is difficult.

FIG. 4 is a graph showing the relationship between the position along the roll axis and the temperature of the roll in the backup roll. The horizontal axis is 0 at the position 300 mm from the end of the roll in the center direction, and the end of the roll is 180 degrees. Is a measurement position along the roll axis, and the vertical axis is the temperature of the backup roll.
As a result of calibrating the infrared sensor using a standard sample in advance, it was found that if the emissivity ε was 0.52, the measurement result with the infrared sensor and the measurement result with the contact-type thermometer coincided. FIG. 4 shows the result of measuring the temperature distribution along the roll axis with an infrared sensor in which the emissivity of the infrared sensor is set to 0.52.
In FIG. 4, the line indicated by the symbol G indicates the result of measuring the measurement region 5 of FIG. 2, and the line indicated by the symbol C indicates the result of measuring the region B of FIG. 2. Moreover, in FIG. 4, the point shown with the code | symbol E, F, H, I, and J has shown the result of the temperature measured with the contact-type thermometer. As shown in FIG. 4, the result G of measuring the measurement region 5 coincides with the result of the temperature measured by the contact thermometer indicated by symbols E, F, H, and I, and there is little noise. On the other hand, the result C of measuring the region B shown in FIG. 2 shows that the roll temperature is apparently high because infrared rays are superimposed. In addition, in the area A shown in FIG. 2, even when the measurement result 5 is G, the roll temperature is apparently higher than the measured value J of the contact thermometer because infrared rays are superimposed. Yes.

The desired length and width of the measurement region 5 may be different for each roll or may be the same. It is more desirable that the desired edge in the length L direction of the measurement regions 51, 52, 53 of each roll 21, 22, 23 is inside the position of the shoulder 25 of the intermediate roll 22. In addition, in the backup roll 21 and the work roll 23, the inside of the position of the shoulder portion 25 of the intermediate roll 22 means the inside of the position facing the shoulder portion 25 of the intermediate roll 22.
In the present invention, the shoulder portion 25 of the intermediate roll 22 is the outermost portion where the intermediate roll 22 is in contact with another adjacent roll, and the end portion of the intermediate roll 22 is shouldered by a straight line or a curved line. Is a place that enters the inside in the length L direction by the amount of shoulder fall from the end of the intermediate roll 22. Further, when the intermediate roll 22 is oscillated, the outermost position where the intermediate roll 22 is in contact with other adjacent rolls as the movement of the intermediate roll 22 is defined as the shoulder portion 25 of the intermediate roll 22.
The measurement area 51, 52, 53 of each roll 21, 22, 23 has a length L direction edge inside the shoulder 25 of the intermediate roll 22, so that the measurement error due to heat from the bearing 10 and adjacent to each other. It can be made less susceptible to measurement errors in contact with other rolls, and a highly reliable measurement result can be obtained.

Moreover, the edge part of the length L direction of the measurement area | regions 51, 52, and 53 may be made the outer side from the position inside the position of the shoulder part 25 of the intermediate | middle roll 22 by 1/4 length of a roll width. More desirable. Stress concentrates on the shoulder 25 of the intermediate roll 22 and the roll temperature tends to rise. Accordingly, when the intermediate roll 22 is oscillated, for example, 100 mm, the position of the shoulder 25 of the intermediate roll 22 that is in contact moves 100 mm, and therefore corresponds to the shoulder 25 of the intermediate roll 22 of the backup roll 21 and work roll 23. The roll temperature of the part increases. For this reason, the desirable length in the L direction of the measurement areas 51 and 53 of the backup roll 21 and the work roll 23 is ¼ of the roll width from the position where the shoulder portion 25 comes into contact when the intermediate roll 22 is oscillated. It is desirable that the position be outside the inner position.
Further, since the outer side from the shoulder portion 25 of the intermediate roll 22 does not come into contact with the backup roll 21 and the work roll 23, the possibility of an increase in roll temperature is extremely low. Therefore, the desirable length in the L direction of the measurement region 52 of the intermediate roll 22 is set to the outside of the position on the inner side by a quarter of the roll width from the position of the shoulder portion 25.

  Further, the width D of the measurement region 5 along the roll axis is set to a range of 1/20 to 1/50 of the roll diameter. If the width D of the measurement regions 51, 52, 53 of each roll 21, 22, 23 is less than 1/50 of the roll diameter, there is a possibility that measurement by the temperature measurement means 6 and arrangement of the temperature measurement means 6 may be difficult. When the width D of the measurement area 51, 52, 53 of each roll 21, 22, 23 exceeds 1/20 of the roll diameter, it is reflected between the roll that measures temperature and another roll that is adjacent to the roll that measures temperature. There is a risk that measurement results having sufficient reliability may not be obtained because the measurement error due to thermal energy is easily affected.

The cover 9 is made of an iron plate that shields the roll 2, and is provided between the temperature measuring means 6 and the roll 2 and above the roll 2 as shown in FIGS. 1 and 3. Further, as shown in FIG. 2, the cover 9 is provided with a window 8 at a portion located between the temperature measuring means 6 and the measurement region 5, and a passing window 82 at a position through which the material to be rolled 3 passes. ing. The window 8 prevents the cover 9 from blocking a part of the measurement areas 51, 52, and 53 of the backup roll 21, the intermediate roll 22, and the work roll 23 and the temperature measuring means 6. is there. The passing window 82 is for allowing the material to be rolled 3 to pass therethrough.
As shown in FIGS. 1 and 3, the cover 9 may be provided only above the roll 2 and between the temperature measuring means 6 and the roll 2, but in order to shield the roll 2 more effectively. It can also be provided in the axial direction of the roll.
Further, as described above, the cover 9 may be provided with the passage window 82, but is divided along the extending direction of the passage window 82 in order to facilitate the installation of the cover 9. Alternatively, a slit that extends one end of the passage window 82 to the edge of the cover 9 may be formed. Furthermore, when measuring the temperature of the measurement region 5 only on the upper side of the material 3 to be rolled, a cover 9 that is divided along the extending direction of the passage window 82 is used. It can arrange | position only to the upper side of.
Moreover, it is desirable that the cover 9 is installed independently so that the temperature of the cover 9 is not increased due to the heat conduction from the roll 2 or the bearing 10, thereby hindering the accuracy of the measured temperature. .

The predicting means 7 predicts the melting damage of the roll 2 using the temperature measured by the temperature measuring means 6 and the rolling load. The prediction means 7 includes a control means for controlling the rolling speed and the rolling load according to the prediction result, and a monitor for displaying the measurement result by the temperature measurement means 6, the prediction result of the prediction means 7, and the like.
As the prediction means 7, a PC (personal computer) can be used. The function as the predicting means 7 is realized by loading a program for realizing the function as the predicting means 7 into a memory provided in the PC and executing it by a CPU (central processing unit). . As the monitor, a monitor built in the PC or an externally connected monitor can be used. The monitor refers to a display device including a CRT (Cathode Ray Tube), a liquid crystal display, or the like.

In order to prevent the roll 2 constituting the dry temper rolling equipment 1 from being melted using such a melting damage prevention apparatus, first, the roll axis 4 of the material 3 to be rolled on the surface 2a of the roll 2 during the rolling operation is used. The temperature of the measurement region 5 along the line is measured by the temperature measuring means 6 in a non-contact manner every predetermined time (temperature measurement step).
The measurement result of the temperature in the measurement region 5 measured by the temperature measurement means 6 is sent to the prediction means 7 as, for example, a two-dimensional distribution of the temperature in the measurement region, the average temperature in the measurement region 5, the maximum temperature in the roll axis 4 direction, the roll axis. By obtaining the minimum temperatures in the four directions, the monitor of the prediction means 7 can, for example, measure the two-dimensional distribution of the temperature in the measurement region, the average temperature in the measurement region 5, the maximum temperature in the roll axis 4 direction, and the minimum in the roll axis 4 direction. Displayed as temperature.
The temperature measurement may be performed on one roll, that is, any one of a backup roll, an intermediate roll, and a work roll, but all rolls have different tempering temperatures and deformation limit linear pressures. It is desirable to do about.

Next, the prediction means 7 obtains the average temperature of the measurement area 5 measured by the temperature measurement means 6, displays the average temperature of the measurement area 5 on the monitor of the prediction means 7, the average temperature of the measurement area 5 and the roll Control values determined in advance based on the tempering temperatures of the rolls are compared to predict roll melting damage, and the obtained prediction results are displayed on the monitor (prediction step).
The roll 2 melts when the temperature of the roll 2 rises during the rolling operation and exceeds the tempering temperature, the surface hardness of the roll 2 decreases, and the roll linear pressure becomes the roll deformation limit linear pressure. To do. Therefore, by causing the predicting means 7 to calculate the average temperature of the measurement region 5 and comparing the average temperature of the measurement region 5 with the control value determined in advance based on the tempering temperature of the roll, the melt damage of the roll can be determined. It can be predicted.
As a management value, it can be set as a value 10 to 80 degreeC lower than the tempering temperature of a roll, for example. If the difference from the tempering temperature of the roll is less than 10 ° C., there is a possibility that the roll has already been melted at the time when the roll melt is predicted. If the difference from the tempering temperature of the roll exceeds 80 ° C., the risk of the roll being melted is too low, and the reliability of the result of predicting the roll melting is reduced.

Then, when the prediction result of the predicting means 7 is, for example, that the average temperature of at least one of the rolls 2 is equal to or higher than a preset management value, the control means controls the rolling speed and rolling load. By doing so, melting damage is prevented.
As the control here, when the average temperature of the roll is equal to or higher than a preset control value, the rolling speed is reduced or the rolling load is reduced to reduce the average temperature of the roll and the roll linear pressure. , It is possible to perform control to prevent melting damage.
Further, when the prediction result of the predicting means 7 is, for example, that the average temperature of at least one of the rolls 2 is equal to or higher than a preset management value, the control content by the control means is displayed on the monitor. Alternatively, an alarm may be issued to the control means.

  In such a melting damage prevention apparatus, since the temperature measuring means 6 for measuring the temperature of the measurement region 5 along the roll axis 4 on the surface of the roll 2 by the infrared sensor is provided, it is caused by the disturbance caused by the superposition of infrared rays. Measurement errors are unlikely to occur, and the temperature of the surface of the roll 2 can be measured with high accuracy. The temperature of the measurement region 5 is measured by the temperature measurement means and predicted using the temperature measured by the temperature measurement means 6. By causing the means 7 to predict the erosion of the roll 2, the erosion of the roll 2 can be prevented.

  In addition, since such a melting damage prevention apparatus is provided with the cover 9, errors due to infrared radiation power radiated from other than the measurement region 5 can be reduced. Therefore, the temperature of the surface of the roll 2 can be measured with very high accuracy.

  In the embodiment described above, the predicting means 7 predicts the roll melt damage using the temperature measured only by the temperature measuring means 6, but the temperature measured by the temperature measuring means 6 and the contact thermometer The melt loss of the roll may be predicted using the temperature measured by In this case, the roll damage can be predicted more accurately, and the roll damage can be more effectively prevented.

Moreover, the prediction process in the melting damage prevention method of this invention is not limited to embodiment mentioned above, It is good also as a process shown below.
The predicting means 7 calculates the temperature difference in the roll axis 4 direction from the maximum temperature in the roll axis 4 direction and the minimum temperature in the roll axis 4 direction, and roll diameter, roll surface hardness, roll body length (distance between fulcrums on which the load is applied) ), The roll linear pressure is obtained using the temperature difference in the four roll axis directions, and the control value determined in advance based on the obtained roll linear pressure and the roll deformation limit linear pressure is compared. The loss is predicted, and the obtained prediction result is displayed on the monitor (prediction process).

The roll 2 melts down even if the temperature of the roll 2 rises during the rolling operation and does not reach the tempering temperature or more, and the temperature difference on the surface of the roll 2 increases and the roll linear pressure becomes the deformation limit linear pressure of the roll. May occur. Therefore, the predicting means 7 calculates the roll linear pressure using the temperature difference in the roll axial direction, and compares the obtained roll linear pressure with the control value determined in advance based on the roll deformation limit linear pressure. It is possible to predict the melting loss of the roll.
As a management value, it can be set as a value 400 kg / mm-650 kg / mm lower than the deformation | transformation limit linear pressure of a roll, for example. If the difference from the roll deformation limit linear pressure is less than 400 kg / mm, there is a possibility that the roll is already melted when the roll melt damage is predicted. If the difference from the roll deformation limit linear pressure exceeds 650 kg / mm, the risk of the roll being melted is too low, and the reliability of the result of predicting the roll melt is reduced, which is not preferable.
In the present embodiment, the change in the roll linear pressure can be calculated by the prediction means 7 using the temperature difference in the direction of the roll axis 4.

  Further, as shown in FIG. 5 described later, the roll linear pressure also changes in response to changes in rolling load. Moreover, as shown in FIG. 6 to be described later, the roll linear pressure rises due to a difference in thermal expansion when there is a temperature difference in the roll axis 4 direction. Therefore, the prediction means 7 is caused to obtain the temperature difference in the roll axis 4 direction, and the roll linear pressure obtained by adding the increase in the roll linear pressure due to the temperature difference in the roll axis 4 direction to the roll linear pressure due to the rolling load is obtained. Thus, the roll linear pressure can be obtained with high accuracy.

  Then, when the prediction result of the predicting means 7 is, for example, that the roll linear pressure of at least one of the rolls 2 is equal to or higher than a preset management value, the rolling speed and rolling load are set to the control means. By controlling, melting damage is prevented.

  Also in such a melting damage prevention method, the temperature of the measuring region 5 is measured by the temperature measuring means 6, and the predicting means 7 is made to predict the melting damage of the roll 2 using the temperature measured by the temperature measuring means 6. The melt damage of the roll 2 is prevented.

Further, in the present invention, the prediction means 7 calculates the average temperature of the measurement area 5 measured by the temperature measurement means 6, displays the average temperature of the measurement area 5 on the monitor of the prediction means 7, and A first prediction for causing the average temperature and a control value determined in advance based on the tempering temperature of the roll to be compared, predicting the melting damage of the roll, and displaying the obtained prediction result on the monitor; Thus, the temperature difference in the roll axis 4 direction is obtained from the maximum temperature in the roll axis 4 direction and the minimum temperature in the roll axis 4 direction, and the roll linear pressure is obtained using the temperature difference in the roll axis 4 direction. By making a comparison between the roll linear pressure and a control value determined in advance based on the roll deformation limit linear pressure, a second prediction is performed to predict roll melting and display the obtained prediction result on the monitor. And things, by the prediction means 7 may be a method of performing a first prediction and a second prediction.
By using such a method for preventing melting damage, a very reliable prediction can be made.

Further, in the present invention, the predicting means 7 calculates the temperature difference in the roll axis 4 direction from the maximum temperature in the roll axis 4 direction and the minimum temperature in the roll axis 4 direction, and predicts the temperature difference in the roll axis 4 direction. It is good also as what is made to display on the monitor of 7 and predicts the melting damage of a roll by comparing the temperature difference as a management value, and the temperature difference of the roll axis line 4 direction, and displays the obtained prediction result on a monitor. .
The control value here is a temperature difference, the roll diameter, the roll surface hardness, the roll body length (distance between fulcrums on which the load is applied), the roll linear pressure determined using the temperature difference in the four directions of the roll axis, and the roll And a predetermined value based on the deformation limit linear pressure.

Hereinafter, the present invention will be described more specifically with reference to experimental examples.
(Experimental example 1)
In a 6-roll rolling mill in which work rolls, intermediate rolls, and backup rolls are arranged above and below a material to be rolled, a backup roll with a roll diameter of 960 mm and a deformation limit linear pressure of 1833 kg / mm, a roll diameter of 460 mm, and a deformation limit line The relationship between the rolling load and the roll linear pressure between the intermediate roll having a pressure of 2165 kg / mm and a curved cross-sectional shape of the edge region was examined.
The result is shown in FIG. From FIG. 5, since the roll linear pressure rose in proportion to the increase in rolling load, it was confirmed that the roll linear pressure could be obtained from the rolling load. In FIG. 5, the roll linear pressure at a rolling load of 700 ton is 861 kg / mm, the roll linear pressure at a rolling load of 800 ton is 984 kg / mm, and the roll linear pressure at a rolling load of 900 ton is 1107 kg / mm. Yes, the roll linear pressure at a rolling load of 1000 tons was 1230 kg / mm.
(Experimental example 2)
Further, the relationship between the rolling load and the roll linear pressure was examined in the same manner as in Experimental Example 1 except that the cross-sectional shape of the edge region of the intermediate roll was a straight line. The result is shown in FIG. In FIG. 5, the roll linear pressure at a rolling load of 700 ton is 905 kg / mm, the roll linear pressure at a rolling load of 800 ton is 1034 kg / mm, and the roll linear pressure at a rolling load of 900 ton is 1164 kg / mm. Yes, the roll linear pressure at a rolling load of 1000 tons was 1293 kg / mm.

(Experimental example 3)
The relationship between the temperature difference in the roll axis direction and the rolling load was examined under the condition that the deformation limit linear pressure of the backup roll as in Example 1 was kept constant. The result is shown in FIG. From the results shown in FIG. 6, it is confirmed that when the temperature difference in the roll axis direction is large, even if the rolling load is small, the deformation limit linear pressure is obtained, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. did it. It was also confirmed that roll roll pressure during rolling operation was determined from the temperature difference in the roll axis direction and the rolling load, and by comparing with the deformation limit linear pressure, roll melting damage could be predicted.
In FIG. 6, the temperature difference in the roll axis direction reaching the deformation limit linear pressure when the rolling load is 700 tons is 74 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure when the rolling load is 800 tons is 65 ° C. Yes, the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 900 ton was 55 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 ton was 45 ° C. .
(Experimental example 4)
Except that the cross-sectional shape of the edge region of the intermediate roll was a straight line, the relationship between the temperature difference in the roll axis direction relative to the deformation limit linear pressure in the backup roll and the rolling load was examined in the same manner as in Experimental Example 3. The result is shown in FIG.
From the results shown in FIG. 6, it is confirmed that when the temperature difference in the roll axis direction is large, even if the rolling load is small, the deformation limit linear pressure is obtained, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. did it. In FIG. 6, the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 700 ton is 71 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 800 ton is 61 ° C. Yes, the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 900 tons was 50 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 tons was 40 ° C. .

(Experimental example 5)
The relationship between the temperature difference in the roll axis direction and the rolling load with respect to the deformation limit linear pressure in the intermediate roll similar to Experimental Example 1 was examined. As a result, it was confirmed that when the temperature difference in the roll axis direction is large, even when the rolling load is small, the deformation limit linear pressure is obtained, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. It was also confirmed that roll roll pressure during rolling operation was determined from the temperature difference in the roll axis direction and the rolling load, and by comparing with the deformation limit linear pressure, roll melting damage could be predicted. The temperature difference in the roll axis direction reaching the deformation limit linear pressure when the rolling load is 700 ton is 215 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure when the rolling load is 800 ton is 194 ° C. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at 900 tons was 174 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 tons was 154 ° C.
(Experimental example 6)
Except that the cross-sectional shape of the edge region of the intermediate roll was a straight line, the relationship between the temperature difference in the roll axis direction relative to the deformation limit linear pressure in the intermediate roll and the rolling load was examined in the same manner as in Experimental Example 5. As a result, when the temperature difference in the roll axis direction is large, it was confirmed that even if the rolling load is small, the deformation limit linear pressure is reached, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 700 tons is 207 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 800 tons is 186 ° C. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at 900 tons was 165 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 tons was 143 ° C.

(Experimental example 7)
In the same 6-roll rolling mill as in Experimental Example 1, a roll diameter of 460 mm, a deformation limit linear pressure of 2165 kg / mm, an intermediate roll having a curved cross-sectional shape in the edge region, a roll diameter of 430 mm, and a deformation limit linear pressure of 2570 kg / mm The relationship between rolling load and roll line pressure between work rolls was investigated. As a result, the roll linear pressure increased in proportion to the increase in rolling load, and it was confirmed that the roll linear pressure could be obtained from the rolling load. The roll linear pressure at a rolling load of 700 ton is 663 kg / mm, the roll linear pressure at a rolling load of 800 ton is 757 kg / mm, the roll linear pressure at a rolling load of 900 ton is 852 kg / mm, and the rolling load The roll linear pressure at 1000 tons was 947 kg / mm.
(Experimental example 8)
Further, the relationship between the rolling load and the roll linear pressure was examined in the same manner as in Experimental Example 7 except that the cross-sectional shape of the edge region of the intermediate roll was a straight line. As a result, the roll linear pressure at a rolling load of 700 ton is 693 kg / mm, the roll linear pressure at a rolling load of 800 ton is 1813 kg / mm, and the roll linear pressure at a rolling load of 900 ton is 1718 kg / mm. The roll linear pressure at a rolling load of 1000 ton was 1623 kg / mm.

(Experimental example 9)
The relationship between the temperature difference in the roll axis direction and the rolling load with respect to the deformation limit linear pressure in a work roll similar to that of Experimental Example 7 was examined. As a result, it was confirmed that when the temperature difference in the roll axis direction is large, even when the rolling load is small, the deformation limit linear pressure is obtained, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. It was also confirmed that roll roll pressure during rolling operation was determined from the temperature difference in the roll axis direction and the rolling load, and by comparing with the deformation limit linear pressure, roll melting damage could be predicted. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 700 tons is 336 ° C., the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 800 tons is 319 ° C., and the rolling load The temperature difference in the roll axis direction reaching the deformation limit linear pressure at 900 tons was 303 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 tons was 286 ° C.
(Experimental example 10)
Except that the cross-sectional shape of the edge region of the intermediate roll was a straight line, the relationship between the temperature difference in the roll axis direction relative to the deformation limit linear pressure in the work roll and the rolling load was examined in the same manner as in Experimental Example 9. As a result, when the temperature difference in the roll axis direction is large, it was confirmed that even if the rolling load is small, the deformation limit linear pressure is reached, and the roll linear pressure increases as the temperature difference in the roll axis direction increases. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 700 tons is 331 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 800 tons is 313 ° C. The temperature difference in the roll axis direction reaching the deformation limit linear pressure at 900 tons was 296 ° C., and the temperature difference in the roll axis direction reaching the deformation limit linear pressure at a rolling load of 1000 tons was 278 ° C.

(Experimental example 11)
Using the dry temper rolling equipment and the erosion prevention apparatus shown in FIGS. 1 to 3, the material to be rolled 3 having a width of 740 mm and a thickness of 0.22 mm is rolled at a rolling speed (LS) of 550 mpm and a load of 850 tons, and the rolling operation is performed. The temperature in the measurement region 5 of all the rolls 2 was measured continuously by the temperature measuring means 6 in a non-contact manner. Then, the predicting means 7 displays the average temperature of the measurement areas 5 of all the rolls 2 measured by the temperature measuring means 6 on the monitor of the predicting means 7, and the average temperature of the measurement areas 5 of all the rolls 2 and the roll The control value determined in advance based on the tempering temperature of 100 ° C. was compared with 100 ° C. to predict the melting damage of the roll, and the obtained prediction result was displayed on the monitor.
And according to the prediction result of the predicting means 7, when the average temperature of the work roll 23 becomes 100 ° C. or higher, the control means reduces the rolling speed at a speed of −2 mpm / min, and the rolling load is −5 ton / min. Control to decrease to 600 at min was performed.
As a result, the average temperature of the measurement region 5 of the work roll 23 was lowered from 100 ° C. to 60 ° C., and melting damage could be prevented.

(Experimental example 12)
Using the dry temper rolling equipment and the erosion prevention apparatus shown in FIGS. 1 to 3, the material to be rolled 3 having a width of 740 mm and a thickness of 0.22 mm is rolled at a rolling speed (LS) of 550 mpm and a load of 800 ton, and the rolling operation is performed. The temperature in the measurement region 5 of all the rolls 2 was measured continuously by the temperature measuring means 6 in a non-contact manner. Then, the predicting means 7 displays the temperature in the roll axis 4 direction of all rolls 2 measured by the temperature measuring means 6 on the monitor of the predicting means 7, and the maximum temperature in the roll axis 4 direction and the roll axis 4 direction are displayed. The temperature difference in the roll axis 4 direction is obtained from the lowest temperature of the roll, and the control value determined in advance based on the temperature difference in the roll axis 4 direction is compared with 50 ° C., thereby predicting the melt damage of the roll. The obtained prediction results were displayed on the monitor.
The temperature difference in the roll axis 4 direction of the work roll 23 is amplified at 1 ° C./min, and the prediction result of the predicting means 7 corresponds to that the temperature difference in the roll axis 4 direction of the work roll 23 becomes 50 ° C. or more. Then, the control means was used to control the rolling load at -5 ton / min to 700 ton and the rolling speed at -2 mpm / min.
As a result, the temperature difference in the roll width direction of the measurement region 5 of the work roll 23 decreased from 50 ° C. to 22 ° C., and it was possible to prevent melting damage.

(Experimental example 13)
Using the dry temper rolling equipment and the erosion prevention apparatus shown in FIGS. 1 to 3, the material to be rolled 3 having a width of 740 mm and a thickness of 0.22 mm is rolled at a rolling speed (LS) of 550 mpm and a load of 800 ton, and the rolling operation is performed. The temperature in the measurement area 5 of all the rolls 2 was measured continuously and non-contacted by the temperature measuring means 6. Then, the predicting means 7 displays the temperature in the roll axis 4 direction of all rolls 2 measured by the temperature measuring means 6 on the monitor of the predicting means 7, and the maximum temperature in the roll axis 4 direction and the roll axis 4 direction are displayed. The temperature difference in the roll axis 4 direction is obtained from the minimum temperature of the roll, and the roll linear pressure is obtained using the roll diameter, roll surface hardness, roll body length (distance between fulcrums applied to the load), and temperature difference in the roll axis 4 direction. By comparing the obtained roll linear pressure with the 1648 kg / mm, which is a control value determined in advance based on the roll deformation limit linear pressure, the melt damage of the roll is predicted, and the obtained prediction result is obtained. Displayed on the monitor.
And according to the prediction result of the predicting means 7, when the roll linear pressure of the work roll 23 becomes 1648 kg / mm or more, the rolling load is reduced to 700 ton at −5 ton / min by the controlling means, and the rolling speed is set to −2 mpm. Control to decrease at a rate of / min was performed.
As a result, the roll linear pressure of the work roll 23 was reduced from 1648 kg / mm to 1280 kg / mm, and melting damage could be prevented.

FIG. 1 is a schematic configuration diagram illustrating, as an example, a roll peripheral portion constituting a dry temper rolling facility and a melting damage preventing apparatus of the present invention. FIG. 2 is an enlarged configuration diagram of the material to be rolled shown in FIG. 1, a roll on the upper side of the material to be rolled, and its peripheral portion as seen from the traveling direction of the material to be rolled. FIG. 3 is an enlarged configuration diagram of the material to be rolled, the roll on the upper side of the material to be rolled, and the temperature measuring unit shown in FIG. 1 as viewed from the direction of the roll axis. FIG. 4 is a graph showing the relationship between the position along the roll axis and the roll temperature. FIG. 5 is a graph showing the relationship between the rolling load and roll linear pressure in the roll. FIG. 6 is a graph showing the relationship between the temperature difference in the roll axis direction and the rolling load when the deformation limit linear pressure in the roll is kept constant.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dry temper rolling equipment, 2 ... Roll, 2a ... Surface, 3 ... Rolled material, 4 ... Roll axis, 5, 51, 52, 53 ... Measurement area, 6 ... Temperature measurement means, 7 ... Prediction means, 8 ... Windows, 82 ... Passing window, 9 ... Cover, 15 ... Machine side monitor, 10, 11, 12, 13 ... Bearing (roll chock), 21 ... Backup roll, 22 ... Intermediate roll, 23 ... Work roll, 4 ... Roll axis

Claims (14)

  An apparatus for preventing melt damage of the roll constituting the dry temper rolling equipment, the temperature measuring means for measuring the temperature of the measurement region in the proximity facing portion along the roll axis of the roll surface with an infrared sensor, An apparatus for preventing melt damage of a roll in dry temper rolling, comprising predicting means for predicting melt damage of a roll using the temperature measured by the temperature measuring means.   The predicting means predicts the roll erosion by comparing the average temperature of the measurement region in the adjacent facing part along the roll axis with a management value determined in advance based on the tempering temperature of the roll. The apparatus for preventing melt damage of a roll in dry temper rolling according to claim 1.   The predicting means obtains a roll linear pressure using a temperature difference in a measurement region located in a close opposed portion along the roll axis, and determines a management value determined in advance based on the roll linear pressure and a roll deformation limit linear pressure. The apparatus for preventing melt damage of a roll in dry temper rolling according to claim 1, wherein the melt damage of the roll is predicted by comparison.   The predicting means obtains a roll linear pressure using a temperature difference and a rolling load of a measurement region in a proximity facing portion along the roll axis, and is determined in advance based on the roll linear pressure and a roll deformation limit linear pressure. The apparatus for preventing melt damage of a roll in dry temper rolling according to claim 1, wherein the melt damage of the roll is predicted by comparing control values.   5. The dry adjustment according to claim 1, wherein the melting prevention device includes a control unit that controls a rolling speed and a rolling load according to a result obtained by the prediction unit. Roll melting prevention device in quality rolling.   The apparatus for preventing melt damage of a roll in dry temper rolling according to claim 1, wherein the temperature measuring means is an infrared sensor having a function of displaying a surface temperature distribution of an object to be measured as an image.   A cover for shielding the roll is provided between the temperature measuring means and the roll, and the cover is provided with a window at a portion located between the temperature measuring means and the measurement region at the close-facing portion. The apparatus for preventing melt damage of a roll in dry temper rolling according to any one of claims 1 and 6.   The roll of the dry temper rolling equipment is composed of a work roll, an intermediate roll, and a backup roll arranged above and below the material to be rolled, respectively, and the temperature measuring means is located at the adjacent facing portion of all the rolls. The temperature of the region is measured, and the roll erosion preventing apparatus in the dry temper rolling according to claim 1.   The roll of the dry temper rolling equipment is composed of a work roll, an intermediate roll, and a backup roll, which are respectively arranged above and below the material to be rolled, and the intermediate roll has a curved cross-sectional shape at at least one end. The width of the measurement area of each roll is set to a range of 1/20 to 1/50 of the diameter of each roll, and the length of the measurement area is The edge is inside the position of the shoulder portion of the intermediate roll, and outside the position inside the position of the shoulder width of the intermediate roll by a quarter of the roll width of each roll. The apparatus for preventing melt damage of rolls in dry temper rolling according to claim 1, wherein   A temperature measurement step for measuring the temperature of a measurement region in a close facing portion along the roll axis of the roll surface using an infrared sensor, which is a method for preventing melting of the roll constituting the dry temper rolling equipment. A roll melt damage prevention method in dry temper rolling, comprising a prediction step of predicting roll melt damage using the measured temperature.   The prediction step predicts roll melting damage by comparing an average temperature of a measurement region in a close facing portion along the roll axis and a control value determined in advance based on a tempering temperature of the roll. The method of preventing roll damage in the dry temper rolling according to claim 10.   The prediction step obtains the roll linear pressure using the temperature difference of the measurement region in the adjacent facing part along the roll axis, and compares the control value determined in advance based on the roll linear pressure and the roll deformation limit linear pressure. The method for preventing melt damage of a roll in dry temper rolling according to claim 10, wherein the melt damage of the roll is predicted.   The predicting step is to determine a roll linear pressure by using a temperature difference and a rolling load of a measurement region in a proximity facing portion along the roll axis, and is determined in advance based on the roll linear pressure and a roll deformation limit linear pressure. The method for preventing melt damage of a roll in dry temper rolling according to claim 10, wherein the melt damage of the roll is predicted by comparing control values. The method for preventing melt damage of a roll in dry temper rolling according to any one of claims 10 to 13, wherein a rolling speed and a rolling load are controlled according to a result obtained in the prediction step.

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