JP3352219B2 - Method and apparatus for monitoring clearance between rolling mill drive system components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for online monitoring of clearance (hereinafter referred to as "play") between parts caused by wear of each part in a drive system of a rolling mill. is there.

[0002]

2. Description of the Related Art Continuously cast slabs are heated to a predetermined temperature in a heating furnace, rolled to a predetermined thickness and width by a rough rolling mill, and then further thinned by a finishing mill to cool a strip. It is cooled to a predetermined temperature in order to obtain desired mechanical properties in the equipment, and is wound into a coil by a winder.

A rolling mill mainly includes a main body 1, a driving device 2, a pressing device 3, and a roll group 4, and a typical quadruple rolling mill is shown in FIG.

[0004] A drive system of a rolling mill is generally configured by combining a motor, a speed reducer, a pinion stand, a spindle, a coupling connecting each of them, and the like.

FIG. 1 shows a plan view of a main part of the rolling mill.
The work roll 6 of the rolling mill is housed in the housing 5, and a chock 7, a liner 8, and the like are mounted between the roll 6 and the housing 5. The drive system parts referred to in the present invention include those including the housing liner 9 supporting the work roll 6, the chock 7, and the liners 15 to 18 below the backup roll.

When components of a drive system, for example, components of a coupling, are worn by sliding between metals, a clearance is generated between the components, and if this clearance is present, a peak torque at the time of hot bar biting is generated. And the components of the drive system may be damaged.

On the other hand, when the liners 8, 9 between the work roll 6 and the housing 5 are worn and the backlash increases, the work roll behaves delicately within the range of the backlash, causing the rolled material to bend. When the rolled material is bent, the bent portions are folded and overlap, and if the rolled material is rolled in the overlapped state, narrowing occurs. If the backup roll chock lower equipment wears out and the mill constant (stand spring constant) differs between the work side and the drive side, wedges are generated due to one-sided pressure, abnormal thrust force is generated, and the hot bar is bent.

[0008]

Since a large torque and a large load are applied to the drive system, the occurrence of a trouble greatly affects the drive system. In addition, rattling of the drive system affects the degree of operation stability, such as narrowing down due to bending of the hot bar. In order to prevent such troubles beforehand, as a current management method, the dimensions of each rotary system component constituting the drive system and various liners in the housing body are measured individually, but there are the following problems.

[0009] There are many measurement points (number of parts), and performing this periodically requires a great deal of labor.

[0010] Since the limit control value is determined by experience, it is not clear whether over-maintenance or under-maintenance.

The relationship between the degree of equipment deterioration and the degree of operation stability is not clear.

Further, when the rotating system parts are worn or various liners in the housing body are worn, the work rolls finally connected are loosened. The components of the work roll rotation system are connected to the work roll neck.
The backup roll sub-equipment is connected to a work roll chock that contacts via a backup roll chock. In order to detect the component wear of the drive system, it is necessary to measure the backlash of the work roll.

Next, in order to improve the accuracy of the measurement, the direction of entry and exit perpendicular to the work roll axis, ie, the horizontal direction (X), the direction of the work roll axis, ie, the thrust direction (Y), and the direction perpendicular to both directions (Z ) Needs to be measured in the three axial directions. In the measurement, it is necessary to analyze a signal obtained from the sensor in order to obtain a characteristic value representing the degree of deterioration of the equipment. Further, there is a demand for a monitoring method in which data representing the degree of stability of operation is quantitatively taken and the degree of equipment deterioration is centrally arranged. Therefore, an object of the present invention is to provide a method and an apparatus for solving the above-mentioned problems.

[0014]

Means for Solving the Problems In view of the above problems, the present inventors have made intensive studies and have completed the present invention. The present invention provides a motor, a motor-side coupling, A method for monitoring the clearance between rolling mill drive system components that drive a work roll, including a spindle, and a work-side coupling, wherein a behavior corresponding to a horizontal direction, a thrust direction, and a vertical direction of the work roll in the drive system is determined. Each is measured by a sensor, and the clearance between the drive system components is monitored based on the measurement information.
The sensor for measuring the horizontal behavior of the work roll consists of a plurality of sensors provided in the housing of the rolling mill,
A method for monitoring clearance between rolling mill drive system components, comprising measuring a plurality of horizontal behaviors orthogonal to a work roll axis between a work roll chock and a housing.

[0015]

Further, according to the present invention, a sensor for measuring a thrust direction behavior of a work roll comprises a load cell attached to a crank bolt for fastening a housing and a clamp, and the load cell rotates from a thrust force measured in the axial direction of the work roll. It is characterized by estimating the wear of system parts.

Further, according to the present invention, a sensor for measuring a thrust direction behavior of a work roll comprises a load cell attached to a crank bolt for fastening a housing and a clamp, and the load cell lowers a thrust force measured in the axial direction of the work roll by the load cell. The wear of the back roll lower equipment is estimated.

Further, the present invention is characterized in that a plurality of horizontal displacements detected by a plurality of sensors during rolling are combined and used as a parameter for determining the bending of a rolled material passing through a rolling mill.

Further, the present invention is characterized in that the wear of the work side coupling is monitored based on the relationship between the thrust force measured by the load cell and the number of work roll rotations.

Further, the present invention is characterized in that the wear of the equipment under the backup roll is monitored by managing the tendency of the average value and the standard deviation value of the thrust force measured by the load cell.

Further, according to the present invention, the amount of horizontal displacement between the work roll chock and the housing is measured at four positions, that is, the upper and lower sides of the drive side and the upper and lower sides of the work side. ).

X = dA−dB−dC + dD (1) where X: parameter dA: upper displacement of drive side (maximum value−minimum value) dB: displacement of lower drive side (maximum value−minimum value) dC: work Side Upper displacement (maximum value-minimum value) dD: Work side Lower displacement (maximum value-minimum value) Also, the present invention relates to the amount of lateral runout of a width gauge provided on the exit side of a rolling mill and the parameter X. And managing the bending of the hot bar based on the relationship.

The present invention also relates to a method for monitoring a clearance (play) between rolling mill drive system components for driving a work roll, including a motor, a motor-side coupling, a spindle, and a work-side coupling. A plurality of sensors provided on the housing measure a plurality of horizontal displacements perpendicular to the work roll axis between the work roll chock and the housing, and combine the measured values to obtain a parameter for predicting the bending of the hot bar. Further, a linear function relationship between this parameter and the amount of lateral runout of the width gauge provided on the output side of the rolling mill is determined, and a load cell attached to a crank bolt for fastening the housing and the clamp of the rolling mill is used. The thrust force in the axial direction of the work roll is measured, and the measured value and the value when the rolled material passes through the rolling mill Seeking over crawl rolling the number of relationships,
The thrust force in the work roll axis direction was measured by a load cell attached to a crank bolt that fastens the housing and the clamp of the rolling mill, and the tendency of the average value and the standard deviation value of the measured values was determined. The value and a control signal for controlling the rolling mill are taken into a central processing unit, and data processing is performed.

The present invention is also a sensor comprising a plurality of sensors provided on a housing of a rolling mill, for measuring a plurality of horizontal movements perpendicular to a work roll axis between a work roll chock and the housing, A sensor that detects a horizontal behavior of the roll, a sensor that detects a thrust behavior of the work roll, a sensor that detects a vertical behavior of the work roll, a storage device that stores a signal from the sensor, and a rolling mill. A device for capturing a part of a control signal, a device for comparing a signal stored in the storage device with a signal from a device for capturing a part of a signal for controlling a rolling mill, and a device for displaying a comparison result And a clearance monitoring device between rolling mill drive system components.

[0025]

In order to detect and manage the play in the drive system of the rolling mill, the behavior of the work roll in three directions of X, Y and Z may be measured. Sensors are provided in the thrust direction as the axis and in the vertical direction as the Z axis, and signals obtained from the sensors are processed.

As the X-axis direction, the sliding wear between the metal of the liner between the rolling roll 6 and the housing 5 is detected. In detecting, a non-contact type displacement sensor is used in consideration of the roll change of the rolling mill, and eddy current type, laser, and ultrasonic wave are used as the corresponding sensors. Considering the resolution, the eddy current method is preferable.

FIG. 1 shows an arrangement of a non-contact type displacement sensor 10 for the X-axis realized by an eddy current sensor. The sensor 10 is fixed to the housing 5, the plate 11 is attached to the work roll chock 7, and the displacement of the work roll chock in the X-axis direction is measured by measuring the distance between the housing 5 and the work roll chock 7.

Measurements were made at a total of four locations on the drive roll (Ds) top and bottom of the work roll chock and on the top and bottom of the work side (Ws), and the maximum value of each measurement location as shown in Table 1 was shown as the X-axis displacement. -The minimum values are set as displacement amounts dA, dB, dC, and dD.

[0029]

[Table 1]

Further, the lateral displacement of the width meter is obtained as a characteristic representative of the horizontal displacement and the magnitude of the bending of the hot bar during rolling, and the lateral displacement and a parameter X as the horizontal displacement are obtained. Is obtained by the equation (1), and a correlation between the X value and the X value is obtained. As a result, a strong relationship represented by a line A is obtained as shown in FIG. Is used as a representative characteristic value of the bending of the hot bar.

X = dA-dB-dC + dD Next, referring to FIG. 4 showing the crank bolt 12 of the rolling mill, the crank bolt 1 is applied as a force applied in the Y-axis direction.
Focusing on No. 2, as the thrust force applied to the work roll,
Since the work roll chock 7 pushes out the clamp 14 and is expressed as a force applied to the crank bolt 12, the thrust force is measured by the load cell 13 shown in FIG.

As shown in FIG. 6, when the thrust force at the time of rolling is obtained as shown in FIG. 6, the wear of the roll coupling, that is, the wear amount from the original thickness of the roll coupling (mm), the read value of the load cell, Is proportional, the thrust force increases when the roll coupling wears out,
Determine the limit control value for the amount of wear.

Further, the output of the load cell changes depending on the number of rolling work rolls for each rolling pass as the rolled material bites into the rolling mill. As is apparent from FIG. The force increases so as to go up one step every rotation of the work roll.

The detection in the Z-axis direction is performed by the backup roll chock lower equipment 15 (thread 16, thread liner 17, bottom separator liner 18, housing, etc.).
Is unevenly worn, the back-up roll 19 rattles, and accordingly, the limit value is determined by the force detected by the load cell attached to the clamp bolt,
The backup roll chock lower equipment 15 can be managed.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Displacements in the X-axis direction are vortices provided at four locations shown in FIGS. 1A and 1B, that is, at four locations on the upper and lower sides of the drive side of the housing and on the upper and lower sides of the work side. It is detected by the current sensor 10.

The play of the rolling mill is monitored in the horizontal direction, and the parameter X = dA-dB-d
For C + dD, the average value and standard deviation value are trend-managed, and at the same time, the signal from the width gauge provided on the exit side of the rolling mill is taken in, and the average value and standard deviation value of the runout of the hot bar as a rolled material are managed. By doing so, if an abnormality is found in the tendency value, each component constituting the component is precisely measured, the abnormality of the component is specified and replaced, and the measurement result of each component is fed back to the central processing unit (CPU). A new threshold was set.

On the other hand, the detection in the Y-axis direction is performed by the load cell 13 using a thrust force applied to the crank bolt 12 as shown in FIG. The measurement chart is as shown in FIG. 5, but the change in the thrust force in the pass increases from the time when the rolled material bites into the work roll, and disappears when the rolled material is pulled out from the work roll. The characteristic is that the number of steps increases stepwise, the number of passes is odd, and the thrust force increases as the number of passes increases.

The number of work roll rotations and the number of steps of the thrust force are determined such that the thrust force tends to increase by one step for each rotation of the work roll. The number is taken from the signal that controls the rolling mill, the number of thrust force steps is calculated as the number of inflection points of the signal that changes stepwise, the slope that changes stepwise, the range of magnitude is determined, and the shape within that range Count the number.

The determination of the abnormal value is obtained by equation (2): | the number of thrust force steps at the n-th pass−the number of work roll rolling at the n-th pass | ≦ 2 (2) The hot bar when the above equation is satisfied Assuming that the number is N ₀ and the number of target rolled materials is N ₁ , the defect rate is obtained by equation (3) and trend management is performed.

Defect rate = (N ₀ / N ₁ ) × 100 (%) (3) The detection in the Z-axis direction is performed by attaching a load cell to a location shown in FIG. , Thread liner, bottom separator liner, housing, etc.), the back-up roll is loose and the force detected by the load cell attached to the lower bolt
That is, it appears as the thrust force of the lower bolt. This thrust force is related to the damage of the crank bolt. Therefore, the tendency management of the average value of the maximum value-minimum value and the standard deviation was performed as a means of detecting the abnormality. As a result, the average of the abnormal values in a state where the thread liner and the bottom separator liner were not familiar was 1476 KN. Average of normal values is 400
1000 KN as a threshold value from the result of ~ 500 KN
Was set to perform trend management.

As described above, it is possible to detect the behavior of the work rolls of the rolling mill in the X, Y, and Z-axis directions, respectively, and to set a threshold based on the detected values and perform trend management. This makes it possible to comprehensively control the play of the rolling mill, and FIG. 8 is a block diagram showing the configuration of an integrated system for such play control. This integrated system collects signals from the detection sensors in the X, Y, and Z directions, collects slab data and the like, and transmits and processes the data. A data processing / display CPU 32 for performing data recording processing, statistical recording processing, statistical processing and recording, and display processing, and a recording device 33, a display device 34, a printing device 35, and a keyboard 36 connected to the CPU 32. . Steel type for controlling the rolling mill, strip width, information during rolling of the rolling mill to monitor the play among the information of the strip thickness rolled material,
For example, the slab thickness and the rolling set value of the fifth pass are designated and taken out. Further, information used for calculating the number of rolling of the work roll from the work roll diameter of the rolling mill and the X, Y, and Z axis directions of the rolling mill described above. Of the sensor detection signal of C for data collection
The processing result is taken into the PU 31 and further output to a CRT screen as a display device 34 or a printer as a printing device 35 by using a CPU 32 for arithmetic processing for processing data as exemplified in Table 2 below.

[0042]

[Table 2]

[0043]

The following effects can be obtained by implementing the present invention.

The displacement amount in the X-axis direction is measured by a displacement sensor, and it is caused by equipment wear based on the relationship with the bending of the hot bar, that is, the relationship between the combination parameter X of the displacement amount in the X-axis direction and the lateral vibration amount of the width gauge. The bending of the hot bar can be prevented.

The wear of the roll coupling can be controlled based on the thrust force of the load cell attached to the crank bolt in the Y-axis direction.

Also in the Z-axis direction, uneven wear of the backup roll lower equipment, that is, rattling in the vertical direction can be detected by using the thrust force of the lower bolt detected by the load cell as a representative characteristic.

Further, the wear of the backup roll lower equipment causes an uneven thickness in the rolled material and causes a reduction. Therefore, the thrust force, the measured value of the wear of the backup roll lower equipment, and the reduction ratio are managed by tendency management. By determining the relationship between, the narrowing down due to the hot bar bending can be prevented.

With the play monitoring system, the abnormality management of the rolling mill drive system can be easily performed and properly controlled so as not to be too large or too small.

[Brief description of the drawings]

FIG. 1 is a main part structural diagram showing a displacement sensor mounting position and a plate mounting position of a rolling mill according to an embodiment of the present invention;
(A) is a plan view and (B) is a side view.

FIG. 2 is an explanatory view showing a schematic structure of a quadruple rolling mill.

FIG. 3 is a diagram illustrating a relationship between a parameter X related to a horizontal displacement sensor and a width fluctuation amount of a width meter.

FIGS. 4A and 4B are main part structural diagrams showing a thrust direction displacement sensor mounting position of the rolling mill according to the embodiment of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is an enlarged view of a portion A in FIG.

FIG. 5 is a diagram illustrating an example of a measurement result obtained by a thrust direction displacement sensor according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a relationship between a wear amount of a roll coupling and a thrust force in a rolling mill.

FIG. 7 is a schematic perspective view of a rolling mill according to an embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a clearance monitoring system according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Drive device 3 Roll-down device 4 Roll group 5 Housing 6 Work roll 7 Chock 8, 9 Liner 10 X-axis sensor 11 Plate 12 Crank bolt 13 Load cell 14 Clamp 15 Lower equipment 19 Backup roll 31, 32 Central processing unit ( CPU)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masafumi Katayama 3-16 Nakadori, Kure-shi, Hiroshima Nisshin Koki Co., Ltd. (56) References JP-A-3-186550 (JP, A) JP-A Heisei 6-31304 (JP, A) JP-A-52-3557 (JP, A) JP-A-59-110107 (JP, U) JP-B 5-27486 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 51/00 B21B 28/00 B21B 33/00 G01M 19/00

Claims (10)

(57) [Claims] 1. A method for monitoring a clearance between rolling mill drive system components for driving a work roll, comprising a motor, a motor-side coupling, a spindle, and a work-side coupling, the method comprising: The sensor measures the behavior corresponding to the direction, the thrust direction and the vertical direction, respectively, monitors the clearance between the drive system components based on the measurement information, and measures the horizontal behavior of the work roll. And measuring a plurality of horizontal movements orthogonal to a work roll axis between the work roll chock and the housing, the clearance monitoring method between rolling mill drive system components. 2. A sensor for measuring the thrust direction behavior of a work roll comprises a load cell attached to a crank bolt for fastening a housing and a clamp. 2. The method according to claim 1, wherein the wear is estimated.
The method for monitoring clearance between rolling mill drive system components as described above. 3. The sensor for measuring the thrust direction behavior of a work roll comprises a load cell attached to a crank bolt for fastening a housing and a clamp. 2. The method according to claim 1, wherein wear of the equipment is estimated. 4. The method according to claim 1, wherein a combination of a plurality of horizontal displacements detected by a plurality of sensors during rolling is used as a parameter for determining the bending of a rolled material passing through a rolling mill. Of monitoring the clearance between rolling mill drive system components. 5. The method of monitoring a clearance between driving system components of a rolling mill according to claim 2, wherein the wear of the work-side coupling is monitored based on the relationship between the thrust force measured by the load cell and the number of work roll rotations. . 6. The rolling mill drive system component according to claim 3, wherein the wear of the equipment under the backup roll is monitored by managing the tendency of the average value and the standard deviation value of the thrust force measured by the load cell. Clearance monitoring method between. 7. The amount of horizontal displacement between the work roll chock and the housing is measured at four points on the upper and lower sides of the drive side and the upper and lower sides of the work side, and the parameter is obtained by the following equation. The method for monitoring clearance between rolling mill drive system components according to claim 4, characterized in that: X = dA−dB−dC + dD, where X: parameter dA: displacement on the upper side of drive side (maximum value−minimum value) dB: displacement on the lower side of drive side (maximum value−minimum value) dC: displacement of upper side of work side (maximum value) Value-minimum value) dD: Work side lower side displacement (maximum value-minimum value) 8. The rolling mill drive according to claim 7, wherein the bending of the hot bar is managed on the basis of the relationship between the amount of lateral deflection of the width gauge provided on the exit side of the rolling mill and the parameter X. Monitoring method for clearance between system components. 9. A method for monitoring clearance (play) between rolling mill drive system components for driving a work roll, including a motor, a motor-side coupling, a spindle, and a work-side coupling, the method comprising: With a plurality of sensors provided, measure a plurality of horizontal displacements orthogonal to the work roll axis between the work roll chock and the housing, obtain a parameter for predicting the bending of the hot bar by combining the measured values, Further, a linear function relationship between this parameter and the amount of lateral runout of the width gauge provided on the exit side of the rolling mill is determined, and the work roll is mounted by a load cell attached to a crank bolt that fastens a housing and a clamp of the rolling mill. Measure the axial thrust force, this measured value and the work roll when the rolled material passes through the rolling mill Determine the relationship between the power numbers and measure the thrust force in the axial direction of the work roll with a load cell attached to the crank bolt that fastens the housing and the clamp of the rolling mill, and determine the average value and standard deviation of the measured values. A clearance monitoring method between rolling mill drive system components, wherein the obtained values and a control signal for controlling the rolling mill are taken into a central processing unit to perform data processing. 10. A sensor for measuring a plurality of horizontal movements orthogonal to a work roll axis between a work roll chock and a housing, the sensor comprising a plurality of sensors provided on a housing of a rolling mill, A sensor for detecting the directional behavior, a sensor for detecting the thrust direction behavior of the work roll,
A sensor for detecting a vertical behavior of the work roll; a storage device for storing a signal from the sensor; a device for capturing a part of a signal for controlling a rolling mill; and a signal and a rolling mill stored in the storage device. A device for monitoring a clearance between rolling mill drive system components, comprising: a device for comparing and calculating a signal from a device for capturing a part of a signal to be controlled; and a device for displaying a result of the comparison calculation.