JPH08128807A - Method and apparatus for displacement measurement of roll of rolling mill - Google Patents

Abstract

PURPOSE: To provide a roll-displacement measuring method, of a rolling mill, which can detect the displacement and the inclination of a work roll precisely in the operating state of the work roll for the rolling mill at low costs and easily and to provide its apparatus. CONSTITUTION: A mirror surface part 12 is formed on the edge of a roll 1a for a rolling mill, the mirror surface part 12 is irradiated with a beam of light by a device 13 which emits the beam of light, and reflected light is detected by a device 16 which detects the reflected light at the mirror surface part 12. Thereby, a change in the position of the roll 1a is measured.

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 measuring the displacement of rolls in a rolling mill.

[0002]

2. Description of the Related Art A rolling mill processes a material into a predetermined plate thickness and various dimensions. Therefore, work rolls are pressed between work rolls at predetermined intervals and in a predetermined state, and the material is run between the work rolls. ing. In this rolling mill, in order to process the material into predetermined dimensions and various dimensions, it is impossible to produce high-precision products unless the work rolls that press the material are set to predetermined intervals and conditions. ,
The amount of discarded products that do not meet the specified accuracy increases, and productivity decreases.

Therefore, an operation such as constantly monitoring whether or not the work roll is in a predetermined state and changing the state of the work roll by display, alarm, or feedback,
You need to do something. In order to detect the state of such a work roll, various methods and devices have been conventionally proposed, for example, as a measurement of roll displacement, a roll chock that supports both ends of the work roll when measuring the roll rolling direction. Alternatively, a device in which a displacement detector such as a magnet scale is attached to a reduction device for pressing the work roll is used.

However, the work roll operating mechanism of the rolling mill is composed of many mechanical parts, and backlash and elastic deformation exist between these parts and between the parts.
In particular, since the rolls of the rolling mill receive a large load during rolling, the set position and the position at the time of rolling are different, and there are many parts, so accurate prediction cannot be performed by calculation. Therefore, particularly when the processing accuracy is required, it is not sufficient to measure the roll displacement as described above indirectly from the rolling down device or to perform the correction by calculation. In order to compensate for it, the upper and lower work rolls are brought into contact with each other in the absence of material, the backlash is removed by the rolling down device, and by tightening, a load is applied to elastically deform,
In this state, the method of measuring the displacement of the rolling position is used.

On the other hand, recently, the crown is also controlled as the shape of the rolled plate, and therefore, the rolls of the rolling mill are axially shifted or tilted in the rolling direction to cross the upper and lower work rolls. Is being done.

In this cross rolling mill, since it is necessary to precisely adjust the inclinations of the upper and lower work rolls, it is necessary to constantly measure the inclination state and displacement of the upper and lower work rolls. It has also been proposed to provide roll displacement detectors on the left and right of the roll chocks at both ends, and to process the data of all the detectors by computer to measure the inclination and displacement of the work roll (Japanese Patent Laid-Open No. 3375/1993).
24).

[0007]

In the conventional rolling mill described above, when measuring the displacement of the work roll in the operating state, the roll chopper supporting the end of the work roll and the displacement detector are provided with displacement detectors. Many errors occur due to backlash and elastic deformation of each part, resulting in inaccuracy.Also, when the upper and lower work rolls are brought into contact with each other to apply a load when there is no material and the value in this condition is corrected, When the roll is hot rolled,
When the temperature change is large or a load change occurs, the correction value is not always accurate, and the measured value becomes inaccurate.

Further, if the processing accuracy of the material is increased, the accuracy cannot be secured only by accurately maintaining the displacement in the rolling direction as described above. That is, the work roll has a gap as a play required for vertical movement in the rolling direction, and there is also play in the axial direction. Therefore, strictly speaking, the change in the position of the work roll is composed of the vertical direction (rolling down direction), the horizontal direction (rolling direction), and the axial direction (shift direction) of the roll which receive the load. It is not possible to detect roll gaps with high accuracy only by measuring in the rolling direction.

On the other hand, in a rolling mill having a plate crown adjusting function of axially shifting the roll of the rolling mill or inclining the roll in the rolling direction, in order to accurately detect the displacement and the inclination, As in the conventional example, it is necessary to provide a total of eight sensors on both sides of both ends of the upper and lower work rolls, and it takes a lot of time and cost to secure the accuracy of the signals from these sensors. Since the displacement of the roll is indirectly detected from the roll chock or the like, there is a drawback that sufficient measurement accuracy cannot be obtained. Further, in a shift rolling machine that only shifts the work rolls in the axial direction, since it is designed on the assumption that roll crossing does not occur, the work rolls as described above are simply moved in the rolling direction. Like the rolling mill
There is no sensor that measures the cross angle, the cross angle is not detected, and highly accurate detection cannot be performed.
There was a drawback.

Therefore, the present invention provides a rolling mill which can accurately detect the displacement and inclination of the work rolls in the operating state of the work rolls of the rolling mill, and can detect them easily at low cost. An object of the present invention is to provide a roll displacement measuring method and its apparatus.

[0011]

In order to solve the above-mentioned drawbacks of the conventional ones, the present invention provides a mirror surface portion on the end surface of a roll of a rolling mill, irradiates the mirror surface portion with a light beam, and reflects light at the mirror surface portion. Is a method for measuring the roll displacement of the rolling mill by measuring the position change of the roll by detecting at a fixed point, and the roll end face of the rolling mill is provided with a mirror surface portion, and the mirror surface portion is irradiated with light rays. A roll displacement measuring device of a rolling mill is configured by including a device and a device for detecting light reflected by the mirror surface portion.

The present invention is also characterized in that, in the roll displacement measuring method for a rolling mill, laser light is used as irradiation light, and reflected light is projected on a screen to detect the reflected light. The position change of the roll is measured by projecting the image onto the roll, capturing the projected image with a camera, and processing the image. The roll chock is provided with a mirror surface portion, and the mirror surface portion is irradiated with a light beam, and the mirror surface portion is irradiated. It is a preferable embodiment that the position change of the roll chock is measured by detecting the reflected light in (1) and compared with the position change of the roll.

According to the present invention, in the roll displacement measuring device of the rolling mill, the device for irradiating the mirror surface with a light beam is a light emitting device for irradiating a laser beam, and the device for detecting the reflected light is a screen. A device for detecting reflected light, a screen for projecting reflected light, a camera for capturing a projected image of the screen, an image processing device for processing an image signal of the camera, and a roll chock having a mirror surface portion, and the mirror surface portion. It is a preferable embodiment to provide a roll chock displacement measuring device provided with a device for irradiating a light ray and a device for detecting a reflected light on the mirror surface portion.

[0014]

Since the present invention is configured as described above, by irradiating the mirror surface portion provided on the end surface of the roll of the rolling mill with a light beam and detecting the reflected light from this mirror surface portion, it is possible to respond to the displacement of the roll. Since the reflected light changes, the displacement of the roll can be accurately measured by detecting the reflected light.

[0015]

EXAMPLE An example of the present invention is installed such that the work rolls on the upper and lower sides of the rolling mill are installed at relatively different installation angles, that is, the axes of the work rolls intersect to form a plate material having a predetermined shape. A description will be given based on an example applied to the cross rolling machine configured as described above.

Both ends of the upper and lower work rolls 1a and 1b of the rolling mill are supported by roll chocks 2, which are held by backup rolls 3 and are rotatably provided. The roll chocks 2 are fixed to a housing 9 in a project block. Supported by 4.

A crosshead 5 is slidably provided in the project block 4 so as to face the side surface of each roll chock 2. A rod 6 extending through a housing 9 is fixed to each crosshead 5, and each crosshead 5 is fixed to the crosshead 5. The rod 6 is connected to the screw jack 7, and the upper work roll screw jack 7a and the lower work roll screw jack 7b are provided so as to operate in opposite directions by gears provided on one shaft 8. There is.

When the shafts 8 on both sides of the work roll are rotated by a driving device (not shown), the screw jacks 7a, 7b are actuated, and the cross head 5 is moved through the rod 6.
Moves forward and backward, pressing and moving the side portion of each roll chock 2, whereby the upper work roll 1a and the lower work roll 1b move so as to incline in opposite directions, and the axis of each work roll 1a, 1b. Cross each other, and the work rolls are arranged so as to be inclined by an angle of θ. In such an arrangement state, the gap between the work rolls 1a and 1b is maintained in a predetermined state, and the material 10 is passed between the work rolls, whereby the material is rolled to a predetermined thickness.

A mirror 12 is fixed to one end surface 11 of each of the work rolls 1a and 1b, and a light emitting device 13 for irradiating a laser beam is supported by a supporting device 14 at a position sufficiently distant from the end surface 11 so that the position and The irradiation angle is adjustable. Further, a light receiving body 16 having a screen 15 is provided adjacent to the light emitting device 13, and the light emitting device 13 is provided.
When irradiating the mirror 12 provided on the end face of the work roll with the laser beam from the
The screen is configured to receive light. In this configuration, as the laser beam, a semiconductor laser beam having a single wavelength with visible light excellent in parallelism and straightness is suitable, and the distance from the roll end face to the light emitting device and the photoconductor is about 15 m. The mirror provided on the end face of the roll is a plane mirror and is attached to the center of the end face of the roll. Further, the support device 14 of the light emitting device 13 includes a position adjusting means for adjusting the position of the light source when the roll diameter and the setting of the rolling mill are largely changed, and an angle for adjusting so that the laser beam can be accurately applied to the mirror. Equipped with adjusting means.

In using the above device, the light emitting device 13
The mirror 12 on the end face of the roll is irradiated with the light, and the reflected light is set to be received by the light receiver, and the position of the light shadow on the screen before the material is caught in the rolling mill is recorded. In order to facilitate recording of the position of the light and shadow, it is preferable to draw a grid-like line on the surface of the screen 15 and attach a scale.

Next, the rolling mill is operated to record the position of the light and shadow on the surface of the screen 15 after the material has been caught between the work rolls. At this time, as shown in FIG. 3, on the surface of the screen 15, it can be read from the screen that the light shadow moves from the position A before the material is bitten into the rolling mill to the position B after the material is bited. You can From this change in position, it is possible to calculate how much the end face of the roll is displaced in the vertical direction and the lateral direction by calculating the displacement angle. From the measurement result of the above displacement, the cross angle is 0.
012 as a difference between the left and right displacements in the rolling direction.
It is detected that the displacement of 7 mm on the work side is large.

In the above device, the reflected light is projected on the screen and the position of the light shadow is read by a scale. For example, as shown in FIG. 4, the screen 15 is transparent and the camera 17 is installed on the back surface thereof. Then, by applying the image data to the image processing device 18 for converting the image data into an electric signal and displaying the result on the display device 19, the roll displacement can be automatically and accurately read.

In the above apparatus, due to the position of the light shadow detected by the screen 15, not only the inclination of the roll and the displacement in the vertical direction but also when the work roll is displaced in the axial direction,
It can be detected by the change of the shadow. Also,
A roll chock is also equipped with a mirror, a light emitting device and a light receiver are also provided for this part, and the displacement of the roll chock is also detected at the same time. However, it is possible to analyze the cause of whether it is occurring on the roll side or the roll chop side.

Further, not only is the roll displacement measurement result simply detected and read, but the measurement result is used as the actual value for feedback control, and the roll reduction position setting device is operated based on this measurement result to set the roll reduction position. It is possible to correct the rolling position of the device and accurately control the plate thickness, improve the accuracy of the plate thickness, and reduce the amount of scrap generated due to deviation from the standard.

Furthermore, the changes over time of the roll displacement measurement results are arranged and examined, and when the size exceeds a predetermined size, work such as maintenance of the rolling mill such as liner replacement is performed, and the actual state of the liner has been conventionally used. Regardless of the situation, regular maintenance work such as liner replacement can be performed only when it is really necessary, so that the maintenance cost can be reduced.

[0026]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, in the working state of the work rolls of the rolling mill, regardless of the existence of the play of the working mechanism of the work rolls, the elastic deformation caused by the load during rolling is suppressed. It is possible to detect the displacement and inclination of the work roll with high accuracy regardless of the existence. Further, in a general laser displacement measuring instrument, the distance between the sensor and the object to be measured is about several tens of mm to 300 mm, and it is necessary to attach this sensor to the rolling mill main body, but in the present invention, the sensor contacts the roll. Since the measuring device can be installed at a position sufficiently separated from the roll, the measurement accuracy can be secured and maintainability can be improved. Moreover, it is not necessary to provide a large number of sensors such as eight as in the conventional sensor,
Since it is sufficient to provide at least one for each roll, the apparatus becomes inexpensive and it is not necessary to spend a lot of time for adjusting them.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross section of an embodiment of the present invention.

FIG. 2 is a cutaway plan view of the same.

FIG. 3 is a diagram showing a light shadow projected on a screen according to an embodiment of the present invention.

FIG. 4 is a front view showing another embodiment of the present invention.

[Explanation of symbols]

 1 ... Work roll 2 ... Roll chock 3 ... Backup roll 4 ... Project block 5 ... Cross head 6 ... Rod 7 ... Screw jack 8 ... Axis 9 ... Housing 10 ... Material 11 ... End face 12 ... Mirror 13 ... Light emitting device 14 ... Supporting device 15 ... screen 16 ... photoreceptor.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B21B 13/14 K

Claims (8)

[Claims] 1. A roll position changer is measured by providing a mirror surface portion on the end surface of a roll of a rolling mill, irradiating the mirror surface portion with a light beam, and detecting reflected light at the mirror surface portion at a fixed point. A characteristic method for measuring roll displacement of a rolling mill. 2. The roll displacement measuring method for a rolling mill according to claim 1, wherein a laser beam is used as the irradiation light, and the reflected light is detected by projecting the reflected light on a screen. 3. The roll displacement measuring method for a rolling mill according to claim 1, wherein the change in roll position is measured by projecting reflected light on a screen, capturing a projected image with a camera, and performing image processing. . 4. A roll chock is provided with a mirror surface portion, the mirror surface portion is irradiated with a light beam, and the position change of the roll chock is measured by detecting the reflected light at the mirror surface portion, and is compared with the position change of the roll. The roll displacement measuring method for a rolling mill according to claim 1 or 2. 5. A mirror surface portion is provided on a roll end surface of the rolling mill,
A roll displacement measuring device for a rolling mill, comprising: a device for irradiating the mirror surface portion with a light beam; and a device for detecting reflected light on the mirror surface portion. 6. The roll displacement measuring device of a rolling mill according to claim 5, wherein the device for irradiating the mirror surface with a light beam is a light emitting device for irradiating a laser beam, and the device for detecting the reflected light is a screen. 7. A screen for projecting reflected light by a device for detecting reflected light, a camera for taking a projected image of the screen,
The roll displacement measuring device for a rolling mill according to claim 5, comprising an image processing device that processes an image pickup signal from a camera. 8. A roll chock displacement measuring device comprising: a roll chock having a mirror surface portion; a device for irradiating the mirror surface portion with a light beam; and a device for detecting reflected light at the mirror surface portion. A roll displacement measuring device for a rolling mill according to.