JP5332606B2 - Roll alignment management method for tandem rolling mill - Google Patents

Description

  The present invention relates to a roll alignment management method for managing roll alignment of a tandem rolling mill in an appropriate state for the purpose of preventing meandering of a material to be rolled during hot rolling.

  9 to 11 schematically show a general hot finishing rolling mill (rolling stand), FIG. 9 is a front view, FIG. 10 is a side view, and FIG. 11 is an offset state between a work roll and a backup roll. It is explanatory drawing (side view) which shows this. In FIG. 9, Op indicates the operator side (driven side), and Dr indicates the drive side (drive side). In each figure, 1a is an upper work roll, 1b is a lower work roll, 2a is an upper backup roll, 2b is a lower backup roll, 5a is an upper work roll chock, 5b is a lower work roll chock, 6a is an upper backup roll chock, and 6b is A lower backup roll chock, 7 is a rolling mill housing, 8 is a housing liner on the rolling mill entrance side, and 9 is a housing liner on the rolling mill exit side. Further, 3x is an operator side hydraulic pressure reduction cylinder, 3y is a drive side hydraulic pressure reduction cylinder, 4x is an operator side load cell (load detector), and 4y is a drive side load cell (load detector).

  In general, during rolling of a material to be rolled by a rolling mill, the work rolls 1a and 1b are shifted in the direction of conveying the material to be rolled with respect to the backup rolls 2a and 2b. This is called offset, and as shown in FIG. 11, the offset amount of the work roll 1 with respect to the center of the housing (center of the rolling mill) is C1, and the offset amount of the backup roll 2 is C2. In general, the sum of C1 and C2 is referred to as an offset amount. Due to such an offset, a horizontal component force (also referred to as offset component force) is generated in the work roll 1 and the backup roll 2. That is, a horizontal component force is generated in the work roll 1 in the direction of the material to be rolled as indicated by the arrow e, and a horizontal component force is generated in the backup roll 2 in the direction of the material to be rolled as indicated by the arrow f. . Thereby, the upper and lower work roll chock 5a, 5b is pushed toward the material to be rolled and the upper backup roll chock 6a, 6b is pushed toward the anti-roll material conveyance direction, and the upper and lower work roll chock 5a, 5b is rolled. Pressed against the rolling mill housing 7 (housing liner 9) on the outlet side in the material conveying direction, and the upper and lower backup roll chock 6a, 6b are pressed against the rolling mill housing 7 (housing liner 8) on the inlet side in the conveying direction of the material to be rolled. It will be.

  However, as shown in FIG. 10, between each roll chock 5, 6 and the rolling mill housing 7 (more precisely, between the chock liner of the upper and lower work roll chock 5a, 5b and the housing liner 8, 9, upper and lower backup roll chock 6a, 6b. Since there is a clearance d between the chock liner and the housing liners 8 and 9, if the roll chocks 5 and 6 are not properly positioned in the pass line direction, the rolling load is relatively small (that is, offset). In the case of rolling with a relatively small pressing force, the roll chocks 5 and 6 are displaced in the pass line direction in the rolling mill housing 7. And if it is uneven on the left and right (drive side and operator side), the opening difference between the upper and lower work rolls 1a and 1b occurs in the width direction of the material to be rolled, and the material to be rolled and the bending are generated. In a remarkable case, there is a problem that the material to be rolled is broken.

  Furthermore, when the roll is crossing between the work roll 1 and the backup roll 2, a thrust force is generated in the roll barrel direction of each roll. FIG. 12 is a conceptual diagram showing a state in which the rolls are crossed within the clearance, and FIG. 13 is a cross angle, a differential load, and a thrust force when the lower work roll 1b and the lower backup roll 2b are crossed. It is a graph which shows the relationship. As shown in FIG. 13, even when only a minute cross angle error of θ = 0.04 ° occurs, a thrust force of 1200 kN is generated. As shown in FIG. 14, this thrust force increases the differential load on the operator side and the drive side due to the moment relationship. As a result, a difference in left and right elongation of the rolling mill housing 7 is generated, and a large opening degree difference is generated between the operator side and the drive side of the upper and lower work rolls 1a and 1b. In addition, when excessive thrust force is generated, equipment troubles such as bearing burnout may occur.

In order to prevent such a problem, for example, as shown in Patent Document 1 and Patent Document 2, a device that urges a bearing box (roll chock) with a hydraulic cylinder in the pass line direction, or Patent Document 3 shows. Thus, a method for minimizing the distance between the roll chock and the rolling mill housing by predicting the rolling mill housing shrinkage due to the rolling load has been proposed. Here, as shown in FIG. 15, the shrinkage of the housing means the deformation in the pass line direction that occurs in the central portion in the vertical direction of the housing due to the rolling load acting in the vertical direction of the rolling mill housing 7 during rolling, that is, the housing shrinkage. Refers to the contraction of the distance between the entry side and the exit side.
JP-A-9-285806 JP 2001-113308 A Japanese Patent Laid-Open No. 7-3018

  As in Patent Document 1 and Patent Document 2, in a device that biases a bearing box (roll chock) with a hydraulic cylinder in the pass line direction, it is important to manage the wear of the housing liner surface against which the biased roll chock is pressed. In addition, as disclosed in Patent Document 3, even when the rolling mill housing shrinkage due to the rolling load is predicted and the distance between the roll chock and the rolling mill housing is minimized, the inlet housing liner surface and the outlet housing liner surface It is important to control the wear of the liner surface that determines the distance between the two (housing window spacing).

  FIG. 16 shows a conventional rolling mill (rolling stand) management method. When the housing window interval of the rolling mill housing 7 is managed, the housing window interval (interval between the liner surface of the housing liner 8 on the inlet side of the rolling mill and the liner surface of the housing liner 9 on the outlet side of the rolling mill is measured by an inside micrometer or the like. ) Is measured, and a shim is inserted between the rolling mill housing 7 and the housing liners 8 and 9 to adjust to a predetermined interval. Moreover, in order to prevent the thrust force due to the cross between the work roll 1 and the backup roll 2, it is not sufficient to manage the housing window interval as described above. The attached piano wire is suspended, the distance between each housing liner surface with respect to the piano wire is measured (down swing method), and shim adjustment similar to the above is performed so that the alignment of the work roll 1 and the backup roll 2 is parallel. .

In order to perform the measurement work as shown in FIG. 16, it is necessary to install a scaffold for working at a high place in a large rolling mill (rolling stand) and high measurement accuracy is required. It has become. In fact, there are cases where the management is delayed because it does not fall within the predetermined measurement time. Further, since the measurement is performed using a micrometer, there is a problem that a measurement error due to a human error is likely to occur.
In addition, although the above method can be used for managing the rolling stand alone, the hot rolling finish rolling mill is as shown in FIG. 17 (FIG. 17 (a) is a side view and FIG. 17 (b) is a plan view). In general, it takes the form of a tandem rolling mill in which 6 to 7 rolling stands A are continuously arranged at intervals of about 6 m. In this case, if there is no difference between the left and right roll openings in each rolling stand A, and even in a state where rolling can be performed stably without inducing meandering, as shown in FIG. If there is a variation in the alignment, the rolling of the entire tandem rolling mill becomes unstable, resulting in a meandering trouble.

The alignment of the tandem rolling mill is determined by the housing installation position at the time of construction. However, due to excessive force acting on the housing due to ground subsidence, earthquakes, operational troubles, etc., aging has changed from the original installation position. Probability is high. In general, the tandem rolling mill is managed with the correct alignment, but there is also a problem that there is no simple method for confirming this.
Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and to collectively manage the roll alignment of all rolling stands of the tandem rolling mill with a small work load and working time. An object of the present invention is to provide a roll alignment management method capable of maintaining alignment with high accuracy.

As a result of studies to solve the above problems, the present inventor has created a coordinate system (reference coordinate system) common to all rolling stands of a tandem rolling mill and uses a known three-dimensional laser tracking technique or the like. The roll alignment of each rolling stand can be measured and the roll alignment of the entire tandem rolling mill can be collectively managed with high accuracy by adjusting the alignment so that the measured value satisfies a predetermined coordinate position in the coordinate system. I found.
The present invention has been made on the basis of such knowledge and has the following gist.

[1] A roll alignment management method for a tandem rolling mill comprising a plurality of rolling stands,
A plurality of benchmarks are installed around the tandem rolling mill, and a measurement reference coordinate system common to all rolling stands is set based on the benchmarks.
Before each rolling stand, a three-dimensional laser tracking device is used to measure the housing liner surface position that determines the alignment of the work roll and backup roll of the rolling stand and the benchmark position, respectively, and based on these measured values, the reference coordinates Determining the coordinates of the measured housing liner surface position in the system;
For the work roll and backup roll of each rolling stand, the line segment connecting the measured left and right housing liner surface positions is used as an alignment measurement value, and the alignment adjustment is performed so that the alignment measurement value is orthogonal to the coordinate axis corresponding to the pass line direction. A roll alignment management method for a tandem rolling mill .

[2] A roll alignment management method for a tandem rolling mill comprising a plurality of rolling stands,
A plurality of benchmarks are installed around the tandem rolling mill, and based on the benchmark, a measurement reference coordinate system common to all rolling stands is set to coincide with the drawing coordinates,
Before each rolling stand, a three-dimensional laser tracking device is used to measure the housing liner surface position that determines the alignment of the work roll and backup roll of the rolling stand and the benchmark position, respectively, and based on these measured values, the reference coordinates Determining the coordinates of the measured housing liner surface position in the system;
A tandem rolling mill characterized in that, for the work roll and backup roll of each rolling stand, the measured housing liner surface position is used as an alignment measurement value, and alignment adjustment is performed so that the alignment measurement value falls within a drawing tolerance. Roll alignment management method.

[3] In the roll alignment management method according to [1] or [2 ] above, an operator uses a long holder that holds the reflector probe of the three-dimensional laser tracking device at the tip, and the operator measures the reflector probe on a rolling stand. A roll alignment management method for a tandem rolling mill, wherein the position of a measurement target part is measured without using a scaffold for work at a high place by being positioned at the target part .

According to the present invention, a reference coordinate system common to all rolling stands of a tandem rolling mill is created, roll alignment of each rolling stand is measured, and the measured value satisfies a predetermined coordinate position in the reference coordinate system. As a result, the roll alignment of all rolling stands of the tandem rolling mill can be collectively managed with a small work load and working time, and the roll alignment of the entire tandem rolling mill can be maintained with high accuracy. be able to.
In addition, by using a three-dimensional laser tracking device as a means for measuring the part of the rolling stand that determines the alignment of the work roll and the backup roll, it is possible to measure compared to a method using a micrometer as a measurement technique as in the prior art. Time can be greatly shortened and measurement accuracy can be improved.

  For this reason, by applying the present invention to roll alignment management of a hot rolling finish rolling mill for steel sheets, a hot-rolled steel strip having a good shape can be manufactured, and by performing stable meandering control, a drawing trouble can be caused. The hot-rolled steel strip can be stably produced without being generated. In particular, in the production of thin hot-rolled steel strips, it is possible to ensure a good steel strip shape and achieve stable threading, improve line operation rate and roll basic unit by suppressing drawing trouble, A hot-rolled steel strip can be manufactured stably.

The present invention is a roll alignment management method for a tandem rolling mill composed of a plurality of rolling stands, sets a measurement reference coordinate system common to all rolling stands, and measures the alignment of the work roll and backup roll of each rolling stand. The alignment is adjusted so that the value satisfies a predetermined coordinate position in the reference coordinate system. There are basically the following two methods in the present invention.
In the first method of the present invention, a measurement reference coordinate system common to all rolling stands is set, and the alignment measurement values of the work roll and the backup roll of each rolling stand are orthogonal to the coordinate axis corresponding to the pass line direction. Adjust the alignment so that Usually, in this method, for each rolling stand, the housing liner surface position that determines the alignment of the work roll and the backup roll is measured, and the line segment connecting the measured left and right housing liner surface positions is used as the alignment measurement value.

In the second method of the present invention, the measurement reference coordinate system common to all rolling stands is set to coincide with the drawing coordinates, and the alignment measurement values of the work roll and the backup roll of each rolling stand are Adjust the alignment so that it is within the drawing tolerance. Normally, in this method, for each rolling stand, the position of the housing liner surface that determines the alignment of the work roll and the backup roll is measured, and this measurement value is used as the alignment measurement value.
In the present invention, in order to obtain the alignment measurement value, it is necessary to measure a portion of the rolling stand (for example, the housing liner surface described above) that determines the alignment of the work roll and the backup roll. It is preferable to use a laser tracking device, and by using this device, it is possible to measure the measurement target portion of the rolling stand with high accuracy in a short time. As this three-dimensional laser tracking device, a commercially available device that is generally used can be used.

FIG. 1 is a conceptual diagram showing a general three-dimensional laser tracking device (hereinafter simply referred to as “tracking device”) used in the present invention and a tracking method using the same.
The tracking device includes a tracker body 10, a controller 11, a reflector probe 12 in which a laser reflecting surface is precisely processed on a part of a spherical shape, and the like. A power source is provided to the tracker body 10 via the controller 11. The tracker body 10 is equipped with a laser transmission source 13, and the transmitted laser light is reflected at the true center of the reflector probe 12. The reflected laser light is detected by a reception source built in the tracker body, and a distance r between the laser transmission source 13 and the reflector probe 12 is detected. The laser transmission source 13 is installed in the tracker body 10 so as to be rotatable in two axial directions (θ, φ). By detecting each angle with a built-in encoder, the three-dimensional polar coordinates (r, r, r) of the reflector probe 12 are detected. θ, φ) can be detected. Depending on the device, there is a device in which the laser transmission source 13 has a function of automatically following the reflector probe 12. In such a device, it is not necessary to focus the laser beam on the measurement target point. Workability is good.

In the present invention, when measuring the position of the rolling stand (here, the housing liner surface) for determining the alignment of the work roll and the backup roll with the tracking device in obtaining the alignment measurement value, for example, the following procedure is used. Do work.
First, as shown in FIG. 2, the tracker body 10 of the tracking device B is disposed in front of the rolling stand A (for example, the floor before the mill). At this time, the arrangement position of the tracker body 10 is determined so that there is no obstacle in the optical path from the laser transmission source 13 to the housing liner surface on the entry side and the exit side of the rolling mill to be measured. After warming up after turning on the power of the tracker body 10, the operator holds the reflector probe 12 in a laser capture state with one hand, and lightly presses the reflector probe 12 against the liner surface of the housing liners 8 and 9 that are measurement target parts. Record the three-dimensional polar coordinates (r, θ, φ). The distance between the center of the reflector probe and the probe ground point on the housing liner surface (= reflector probe radius) can be offset by software, and the points on the housing liner surface to be measured can be recorded.
When measuring the position of the housing liner surface of each rolling stand A with the tracking device B, as shown in FIG. 7 to be described later, a long holding tool 14 holding the reflector probe 12 of the tracking device at the tip is provided. By using the operator to position the reflector probe 12 at the measurement target site of the rolling stand A, the measurement can be performed without using a scaffolding for working at high places.

  In order to set a measurement reference coordinate system common to all rolling stands of the tandem rolling mill, it is preferable to install a benchmark around the tandem rolling mill (for example, the floor before the mill) as shown in FIG. . Since the benchmark 15 serving as a reference point for creating the reference coordinate system requires high accuracy, a place where the influence of surrounding disturbance (vibration, temperature, humidity, etc.) is small is desirable. For example, the benchmark 15 is created from the basis around the tandem rolling mill. It is desirable. In order to create coordinates, benchmarks of 3 points or more, preferably 5 points or more are required. For example, as shown in FIG. 3, two points parallel to the pass line direction and a direction orthogonal to the pass line direction are used. It is desirable to install benchmarks 15 on the two points (one of which can be shared with the former). In order to avoid wear due to dust and corrosion during operation, it is desirable that the benchmark 15 is a pedestal made of stainless steel or the like, and a protective cover is provided except during measurement work.

Hereinafter, an embodiment of the first method of the present invention will be described according to the work flow of FIG.
A plurality of benchmarks for setting the reference coordinate system are installed, for example, on the floor in front of the mill in the form shown in FIG. 3, and a reference coordinate system common to all rolling stands is set based on these benchmarks.
Among all rolling stands A constituting the tandem rolling mill, No. The tracker body 10 of the tracking device B is placed one stand before, and the position of the benchmark 15 is measured by the tracking device B by the method shown in FIG. 2, for example, and subsequently, the housing liners 8 and 9 which are measurement target portions. Measure the position of the liner surface. In this measurement of the housing liner surface, for example, the measurement is performed with a target of several tens of points for each housing liner surface, and a plane approximation process is performed to alleviate the influence of local unevenness and the position of each housing liner surface is specified. The three-dimensional coordinates are obtained (specifically, the three-dimensional coordinates at the center of gravity of the housing liner surface are obtained).

Next, the tracker body 10 of the tracking device B is set to No. 2 stands before, no. In the state where it was sequentially moved in front of each rolling stand and placed in front of each rolling stand, such as 3 stands before, and so on. The same procedure as the measurement before one stand is repeated to measure the benchmark position and the housing liner surface position, identify each housing liner surface position, and obtain its three-dimensional coordinates.
As described above, by measuring the benchmark position when measuring the position of the housing liner surface before each rolling stand, the coordinate conversion in the common reference coordinate system is performed for the position measurement result of the housing liner surface at each rolling stand A. Processing is possible. Here, even if it is a benchmark measurement point, it is inevitable that a measurement error of about the measurement resolution occurs for each measurement. Therefore, the more benchmarks (preferably five or more) are provided, the more the approximation processing is performed during the coordinate conversion. Can be reduced.

  Further, in the measurement of the position of the housing liner surface, the conventional measuring method using an inside micrometer requires a measuring time of about several minutes per point, so that it is necessary to limit the number of measuring points to some extent within the limited measuring time. The housing liner surface is expected to wear evenly by sliding with the chock liner surface, but on the other hand, in the above conventional method where the number of measurement points is limited, there are accidental irregularities in the measurement points, Alternatively, if the measurement point is unevenly worn, a large deviation from the original measurement value occurs, and in the worst case, the above-described meandering trouble and equipment failure are induced. On the other hand, since the measurement can be performed in about 5 seconds per point by using the above-described three-dimensional laser tracking technology, it is possible to perform multi-point measurement on the scale of several tens of points per housing liner surface. Is possible. For this reason, it is possible to alleviate the influence of wear distribution in the housing liner surface, local unevenness and uneven wear due to approximate planarization, and obtain highly reliable measurement data.

As described above, the coordinate value of the measurement value of the housing liner surface position at each rolling stand A is converted into a reference coordinate system common to all rolling stands. Further, as shown in FIG. 5, a line segment g connecting the left and right housing liner surface positions p _L and p _R (housing surface positions on both sides in the width direction of the rolled material) after coordinate conversion is used as an alignment measurement value. However, a predetermined alignment adjustment is performed for the housing liner that needs to be adjusted so as to be orthogonal to the coordinate axis corresponding to the pass line direction. Usually, this alignment adjustment is performed by shim adjustment in which a shim plate is inserted into the base surface of the housing liner.

Next, an embodiment of the second method of the present invention will be described according to the work flow of FIG.
In this method, based on the benchmark 15 described above, a reference coordinate system common to all rolling stands is set to coincide with the drawing coordinates. That is, the benchmark position is specified on the design drawing of the tandem rolling mill, and this becomes the reference coordinate system.
Measurement of roll alignment (measurement of housing liner surface and benchmark position) at each rolling stand A is the same as the first method of the present invention described above.
For the measurement value of the housing liner surface position at each rolling stand A, the coordinate conversion to the reference coordinate system common to all the rolling stands is performed, but in this method, the measurement value itself of the housing liner surface position is subjected to coordinate conversion to measure the alignment. Value. Then, a predetermined alignment adjustment is performed for the housing liner that needs to be adjusted so that the alignment measurement value falls within the tolerances shown in the drawing. As in the first method described above, this alignment adjustment is usually performed by shim adjustment in which a shim plate is inserted into the base surface of the housing liner.

  As described above, in the conventional method, it is necessary to carefully check the amount of complicated shim adjustment based on the measurement results so that the alignment of the upper and lower work rolls and the alignment between the work roll and the backup roll are compatible. Although there was a possibility of inducing an error, in the method of the present invention, since management based on a coordinate system common to all stands based on the benchmark is possible, no complicated alignment check at the site is necessary, and each housing This is a simple management method that requires adjustment so that the measured value of the liner surface position satisfies a predetermined coordinate position.

  The present invention was applied to roll alignment management of a hot rolling finish rolling mill (tandem rolling mill) for steel sheets. As shown in FIG. 3, on the floor in front of the mill, two points along the direction parallel to the pass line direction and two points along the direction orthogonal to the pass line direction are located in the same horizontal plane at a total of four points. Benchmark 15 was installed. A reference coordinate system was set in which one point was the origin, the pass line direction was the X axis, the direction orthogonal to the pass line direction was the Y axis, and the normal direction of the horizontal plane passing through all four benchmarks was the Z axis.

  Of all 7 stands (rolling stands) constituting the tandem rolling mill, No. The tracker body 10 of the tracking device B was placed one stand before, and warming up was performed for about 30 minutes after the power was turned on. During this time, the housing liner surface, which is the measurement target part, was cleaned. After the warm-up was completed, the position of the benchmark 15 (4 points in total) was measured, and then the position of the housing liner surface, which is the measurement target part, was measured. As shown in FIG. 16, in the case of the conventional measurement method, it is necessary to assemble a scaffold corresponding to each housing liner surface. In this embodiment, however, the reflector probe 12 of the tracking device B is held as shown in FIG. Using the long holding tool 14, the operator positioned the reflector probe 12 on the housing liner surface, thereby measuring the housing liner surface position without installing a scaffolding for working at a high place.

  40 for each housing liner surface of the housing liner surface (housing liner surface facing the right and left roll chock of the upper and lower work rolls + housing liner surface facing the right and left roll chock of the upper and lower backup roll = 16 surfaces / stand) that is the measurement target part. Measurement was performed with a point as a target, a plane approximation process was performed to alleviate the effects of local unevenness, each housing liner surface position was identified, and its three-dimensional coordinates were obtained (specifically, the housing liner) 3D coordinates at the center of gravity of the surface were calculated). This is a measurement of the housing liner surface position.

Next, the tracker body 10 is set to No. 2 stands before, no. In the state where it was sequentially moved in front of each rolling stand and arranged in front of each rolling stand, such as 3 stands before, and so on. The same procedure as the measurement before one stand was repeated to measure the benchmark position and the housing liner surface position, identify each housing liner surface position, and obtain its three-dimensional coordinates.
No. 1-No. Based on the measurement values of the four benchmarks before 7 stands, coordinate conversion of the measurement values of the housing liner surface position (coordinate conversion to the reference coordinate system common to rolling stands) was performed, and the alignment measurement values (housing reflecting the amount of wear) Liner surface position coordinates). And predetermined shim adjustment was performed about the housing liner which needs alignment adjustment so that an alignment measurement value may be settled in figure size tolerance.

  FIG. 8 shows the frequency (ratio) of threading trouble occurrence between the implementation period of the conventional management method as shown in FIG. 16 and the implementation period of this embodiment. According to this, during the period when the conventional management method was implemented, there were cases where measurement and management were delayed, not within the predetermined measurement time, and periodic fluctuations in the frequency of occurrence of boarding troubles associated therewith occurred. However, after introducing the roll alignment batch management method according to the present invention (the present embodiment), no measurement delay has occurred, and as a result, meandering trouble is reduced to about 1/2 of the conventional method. Occurrence of plate troubles became stable at a low level.

Conceptual diagram showing a general three-dimensional laser tracking apparatus used in the present invention and a tracking method using the same. In this invention, explanatory drawing which shows one Embodiment in the case of measuring the position of the measurement object site | part of a rolling stand using a three-dimensional laser tracking apparatus In this invention, explanatory drawing which shows the installation example of the benchmark which becomes the reference point which creates the reference coordinate system Drawing which shows the work flow of one embodiment of the first method of the present invention. Explanatory drawing which shows an example of how to obtain the alignment measurement value in the first method of the present invention Drawing which shows the work flow of one embodiment of the 2nd method of the present invention. In an Example, explanatory drawing which shows typically the position measurement condition of the measurement object site | part by a three-dimensional laser tracking apparatus A graph showing the frequency of occurrence of plate trouble during the implementation period of the conventional management method and the implementation period of this example Front view schematically showing a typical hot finishing mill (rolling stand) Side view of the hot finish rolling mill of FIG. FIG. 9 is an explanatory view showing the offset state of the work roll and the backup roll in the hot finish rolling mill of FIG. Conceptual diagram showing a state where the roles are crossed between the work roll and the backup roll Graph showing the relationship between roll cross angle, differential load and thrust force when the lower work roll and lower backup roll are crossed Explanatory drawing showing the occurrence of differential load due to thrust force when the lower work roll and lower backup roll are crossed Explanatory drawing showing the occurrence of rolling mill housing shrinkage due to rolling load Explanatory drawing showing the measurement and management method of rolling mills by the conventional method Explanatory drawing which shows the case where there is dispersion | variation in the alignment of a rolling stand group which comprises a hot finishing rolling mill, and each rolling stand

Explanation of symbols

1a Upper work roll 1b Lower work roll 2a Upper backup roll 2b Lower backup roll 3x, 3y Hydraulic pressure cylinder 4x, 4y Load cell 5a Upper work roll chock 5b Lower work roll chock 6a Upper backup roll chock 6b Lower backup roll chock 7 Rolling mill housing 8, 9 housing Liner 10 Tracker body 11 Controller 12 Reflector probe 13 Laser source 14 Long holder 15 Benchmark A Rolling stand B 3D laser tracking device p _L , p _R Housing liner surface position

Claims (3)

A roll alignment management method for a tandem rolling mill comprising a plurality of rolling stands,
A plurality of benchmarks are installed around the tandem rolling mill, and a measurement reference coordinate system common to all rolling stands is set based on the benchmarks.
Before each rolling stand, a three-dimensional laser tracking device is used to measure the housing liner surface position that determines the alignment of the work roll and backup roll of the rolling stand and the benchmark position, respectively, and based on these measured values, the reference coordinates Determining the coordinates of the measured housing liner surface position in the system;
For the work roll and backup roll of each rolling stand, the line segment connecting the measured left and right housing liner surface positions is used as an alignment measurement value, and the alignment adjustment is performed so that the alignment measurement value is orthogonal to the coordinate axis corresponding to the pass line direction. A roll alignment management method for a tandem rolling mill. A roll alignment management method for a tandem rolling mill comprising a plurality of rolling stands,
A plurality of benchmarks are installed around the tandem rolling mill, and based on the benchmark, a measurement reference coordinate system common to all rolling stands is set to coincide with the drawing coordinates,
Before each rolling stand, a three-dimensional laser tracking device is used to measure the housing liner surface position that determines the alignment of the work roll and backup roll of the rolling stand and the benchmark position, respectively, and based on these measured values, the reference coordinates Determining the coordinates of the measured housing liner surface position in the system;
A tandem rolling mill characterized in that, for the work roll and backup roll of each rolling stand, the measured housing liner surface position is used as an alignment measurement value, and alignment adjustment is performed so that the alignment measurement value falls within a drawing tolerance. Roll alignment management method.   Without using a scaffold for working at a high place by using a long holder that holds the reflector probe of the three-dimensional laser tracking device at the tip, and the operator positions the reflector probe at the measurement target site of the rolling stand. The roll alignment management method for a tandem rolling mill according to claim 1, wherein the position of the measurement target part is measured.

Images