WO2005035155A1 - 多段圧延機の芯ずれ量測定方法及び測定装置 - Google Patents
多段圧延機の芯ずれ量測定方法及び測定装置 Download PDFInfo
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- WO2005035155A1 WO2005035155A1 PCT/JP2004/014826 JP2004014826W WO2005035155A1 WO 2005035155 A1 WO2005035155 A1 WO 2005035155A1 JP 2004014826 W JP2004014826 W JP 2004014826W WO 2005035155 A1 WO2005035155 A1 WO 2005035155A1
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- WIPO (PCT)
- Prior art keywords
- misalignment
- rolling mill
- pass line
- laser light
- captured image
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
- B21B38/105—Calibrating or presetting roll-gap
Definitions
- the present invention relates to a multi-stage rolling mill used in a rolling process of a steel tube or a long bar, etc., in which a groove formed by rolling rolls incorporated in each stand (a region surrounded by a groove profile of the rolling rolls).
- the present invention relates to a method and an apparatus for measuring the amount of misalignment, which can be used to correct the position of a rolling roll by measuring the misalignment and measuring the misalignment direction and the amount of misalignment when the misalignment occurs.
- the rolling roll when replacing a rolling roll, the rolling roll is incorporated into a spare housing in a roll shop, and the rolling roll is polished in that state so that the gap between the rolling rolls has the same dimension.
- the housing incorporating the rolls after polishing is mounted on a rolling mill, and centering is not performed through all the stands in a rollable state.
- the rolling operation may be performed with the center misalignment occurring.
- the misalignment that occurs in such a case causes a reduction in rolling dimensional accuracy such as a wall thickness, an outer diameter and a shape, and causes flaws caused by a rolling roll.
- a piano wire is laid along a reference pass line, and the piano wire is A method of measuring a horizontal position of a rolling roll by suspending a weighted piano wire and comparing a position of the suspended piano wire with a position in a design drawing is known. The position in the vertical direction is measured by comparing the measured value of the optical level meter with the dimension on the drawing, and necessary adjustment is appropriately made according to the amount of misalignment.
- a beam detection unit that receives the emission beam of the laser irradiation unit near the carry-in side of the first stand and the laser irradiation unit near the carry-out side of the final stand.
- a jig having a center portion corresponding to the center of the space is detachably attached to a substantially circular space formed by each pair of calipers.
- a method has been proposed in which a pair of rolls is corrected by irradiating a laser beam vertically so that the center of each jig coincides with the center of a laser beam (for example, see Japanese Patent Application Laid-Open No. No. 121810).
- a drum-shaped jig roll having a reference target at the center and held between rolling rolls of each stand of a multi-high rolling mill, and an optical reader for measuring the center position of the reference target (For example, see Japanese Utility Model Application Laid-Open No. 3-68901).
- a light source for irradiating parallel rays from the entrance side to the exit side of the rolling roll of the rolling roll of the multi-stage steel pipe rolling machine from the entrance side to the exit side, and a light receiving device for receiving the parallel rays on the exit side of the rolling roll in the direction of transport of the steel pipes There has been proposed a roll roll centering apparatus comprising: a roll display centering device that calculates and displays a centering position based on the position of the roll obtained based on the light receiving result of the light receiving device (for example, an actual flatbed). 4-33401).
- a light source and a television camera are arranged before and after a hole formed by a pair of rolls of a single rolling mill, and the amount of deviation of the hole taken by the television camera is displayed on a display device.
- a hole type misalignment measuring device capable of easily knowing the amount of type misalignment (for example, see Japanese Patent Application Laid-Open No. 59-19030).
- a jig is inserted between rolling rolls, and the center of the jig and The positional relationship with the irradiated laser beam also measures the core of the rolling roll.
- a groove formed by three rolling rolls has a complicated shape, and when only one rolling roll is displaced, the center of the jig is aligned with the core. Since it is structurally difficult to properly hold the jig between the rolling rolls, it is extremely difficult to secure the centering accuracy.
- the apparatus disclosed in Japanese Utility Model Application Laid-Open No. 33401/1992 measures the core of a rolling roll by projecting the lowest concave portion of the rolling roll, and the positional relationship of the most protruding portion of the roll roll die is measured.
- the core cannot be measured when the rolling mill is tilted with respect to the optical axis.
- the light source is installed outside the stand.
- edge images of a plurality of rolling rolls overlap and it is difficult to distinguish a rolling roll core to be measured from another roll core.
- the illumination device is moved to the background position of each of the rolling rolls to be measured, and the imaging is sequentially repeated, whereby the multi-stage rolling mill can be used.
- the core can be measured in a short time and with high accuracy.
- the imaging device must be arranged so that the pass line of the multi-stage rolling machine and the optical axis of the imaging device substantially coincide with each other.
- the adjustment is troublesome, and the measurement accuracy is affected by the coincidence of the pass line and the optical axis.
- a zoom lens is usually used as an imaging optical system of the imaging device.
- Using a lens with a fixed focal length as the imaging optical system results in a large difference in the imaging field of view between the first and last stands.As a result, the resolution of the stand is far lower and the measurement accuracy deteriorates. Because.
- the zoom lens generally shifts the imaging visual field when the focal position is changed (the optical axis shifts).
- the pass line of the multi-high rolling mill substantially coincides with the optical axis of the imaging device. It is necessary to arrange the imaging device in such a way that the adjustment is time-consuming and, especially when a zoom lens is used as the imaging optical system of the imaging device, the path line and the imaging device are used at all focal positions. There is a problem that it is extremely difficult to dispose the imaging device so that the optical axis substantially coincides with the optical axis.
- the present invention has been made in order to solve such a problem of the prior art, and accurately adjusts the amount of misalignment without making the optical axis of the imaging device coincide with the pass line of the multi-high rolling mill. It is an object of the present invention to provide a method and an apparatus for measuring the amount of misalignment that can be measured.
- the present invention relates to a method for measuring the amount of misalignment of a hole formed by a rolling roll of each stand constituting a multi-high rolling mill, Arranging a reference means, whose positional relationship with the pass line of the multi-high rolling mill has been clarified in advance, between each of the stands or each of the stands; and setting each of the stands from the loading side or the unloading side of the multi-high rolling mill. Imaging the groove formed by the rolling roll and the reference means in the same field of view, and corresponding to the pass line in the captured image based on an area corresponding to the reference means in the captured image.
- the reference means whose positional relationship with the pass line of the multi-high rolling mill has been clarified in advance, and the die formed by the rolling rolls of each stand are imaged in the same field of view. Calculating the position corresponding to the pass line in the captured image based on the area corresponding to the reference means, calculating the center position of the area corresponding to the hole shape in the captured image, and Based on the calculated position corresponding to the pass line, the misalignment amount of the groove is calculated.
- the reference means is sequentially arranged in the vicinity of each of the rolling rolls to be measured, and the imaging is sequentially repeated, whereby it is possible to accurately measure the core of the groove of the multi-high rolling mill.
- the present invention is also an apparatus for measuring the amount of misalignment of a groove formed by rolling rolls of each stand constituting a multi-stage rolling mill, wherein the apparatus is disposed between the stands and includes the multi-stage rolling mill.
- Reference means whose positional relationship with the pass line of the mill has been clarified in advance, and holes formed on the loading side or the unloading side of the multi-stage rolling mill, which face the multi-stage rolling mill and are formed by the rolling rolls of the respective stands.
- An imaging device arranged so that a mold and the reference means can be imaged in the same field of view; and a core of the hole type based on an image captured by the imaging device.
- a signal processing device for calculating a shift amount wherein the signal processing device determines a position corresponding to the pass line in the captured image based on an area corresponding to the reference means in the captured image.
- the signal processing device determines a position corresponding to the pass line in the captured image based on an area corresponding to the reference means in the captured image.
- calculating the center position of the area corresponding to the hole shape in the captured image and calculating the center misalignment of the hole shape based on the calculated center position and the position corresponding to the calculated path line.
- the misalignment amount measuring device includes an illuminating device arranged between the stands and illuminating the hole type from a side opposite to a side on which the imaging device is arranged.
- the illumination device for illuminating the hole type to be measured is inserted and arranged between the stands, sufficient illuminance can be ensured at the time of imaging, and the illuminating device can be included in the captured image. It is possible to accurately calculate the center position of the area corresponding to the hole shape.
- the misalignment measuring device includes a first target member arranged between the stands, and a laser beam directed from the side where the imaging device is arranged to the first target member.
- a laser light source that emits a laser beam, and the reference unit is a laser spot irradiated on the first target member from the laser light source.
- the laser spot is sequentially formed on the first target member due to the linearity of the laser light. Is irradiated, and by sequentially repeating the imaging of the laser spot and the die, it is possible to accurately measure the core of the die of the multi-high rolling mill.
- the misalignment amount measuring device is arranged at a position in the two stands of the multi-high rolling mill, within a field of view of the imaging device, at a position where the emitted laser light is irradiated with the laser light source power.
- a second target member whose positional relationship with the pass line of the multi-high rolling mill is defined in advance.
- the laser spots are radiated on the second target members provided on the two stands (for example, the foremost stand and the last stand) of the multi-high rolling mill, and the respective laser spots are irradiated.
- the laser beam and the pass line can be adjusted substantially in parallel by adjusting the laser beam so that the laser beam is irradiated at the same distance in the horizontal and vertical directions with respect to the pass line.
- each of the second target members is equidistant in the horizontal and vertical directions with respect to the pass line.
- the laser spot and the pass liner radiated on the first target member will be located at the same distance, so that the first target member will be irradiated with the laser beam. Based on the obtained laser spot, it becomes easy to calculate the position corresponding to the pass line in the captured image.
- the misalignment amount measuring device includes a movable stage on which the laser light source is mounted and which can adjust a direction of laser light emitted from the laser light source.
- the laser light source is mounted on a movable stage such as an X-axis stage (horizontal movable stage), a Z-axis stage (vertical movable stage), a tilt stage, and a rotary stage, the light is emitted. It is possible to easily adjust the direction of the laser beam to be emitted.
- the imaging device is further mounted on the movable stage, and the movable stage integrates a direction of a laser beam emitted from the laser light source with a direction of an optical axis of the imaging device. Adjustable.
- the direction of the laser beam emitted from the laser light source and the direction of the optical axis of the imaging device can be integrally adjusted by the movable stage, so that the emitted laser beam If the optical axis of the imaging device and the optical axis of the imaging device are adjusted in advance approximately in parallel, the optical axis of the imaging device and the path line are automatically adjusted by adjusting the laser light and the nosline approximately in parallel as described above. It will be adjusted substantially in parallel.
- the present invention as described above, it is not essential to adjust the optical axis of the imaging device and the pass line in parallel, but if the position is extremely deviated, the hole type and the laser spot will be in the same field of view at each stand. In order to avoid this, it is convenient to automatically adjust the optical axis of the imaging device and the pass line so as to be substantially parallel to each other.
- the first target member is configured to be movable at least once in a plane substantially perpendicular to an emission direction of the laser light source within an imaging cycle of the imaging device. Made.
- the emission direction of the laser light source is set to the first target member. Because the laser spot moves at least once in a plane substantially perpendicular to the plane (for example, rotates and vibrates), the laser spots that are imaged during the imaging cycle are different from those of the first target member. Is integrated in the imaging cycle. Therefore, the effect of laser speckle caused by the irregularities on the surface of the first target member is mitigated in the imaged laser spot, and a relatively clear spot shape is obtained. The position corresponding to can be calculated with high accuracy.
- the second target member may be configured to be movable at least once in a plane substantially perpendicular to the emission direction of the laser light source during an imaging cycle of the imaging apparatus. preferable.
- the signal processing device is configured to perform, based on a region corresponding to the hole shape in the captured image. An edge portion of each of the rolling rolls is extracted, and a groove bottom portion of each of the rolling rolls is extracted based on a distance between the extracted edge portion and a pixel at a position corresponding to the calculated pass line or a neighboring pixel. It is configured to detect and calculate the center position of an imaginary circle passing through at least three groove bottoms among the detected groove bottoms of each rolling roll as the center position of a region corresponding to the groove shape.
- a region corresponding to the hole shape in the captured image is subjected to a process such as binarization, and a peripheral portion thereof, that is, an edge portion of the rolling roll is extracted.
- a pixel at a position corresponding to the calculated pass line or a pixel in the vicinity thereof for example, when detecting an edge portion of a rolling roll positioned upward or downward in a captured image, a horizontal
- the groove bottom of each rolling roll can be detected on the basis of the distance (for example, ⁇ 10 pixels) (for example, the edge where the distance is the longest is detected as the groove bottom). Since there are three or more groove bottoms detected in this way, a virtual circle passing through at least three groove bottoms can be drawn, and the center of the virtual circle is the center of the area corresponding to the hole shape. It can be calculated as a position.
- the signal processing device is configured to perform the processing based on an area corresponding to the hole shape in the captured image. Extracting an edge portion of each of the rolling rolls, and detecting a groove bottom of each of the rolling rolls based on a distance between the extracted edge portion and a pixel at a position corresponding to the calculated pass line or a pixel in the vicinity thereof. The position of the midpoint of the line connecting the groove bottoms of the detected rolling rolls is calculated as the center position of the area corresponding to the groove shape.
- a region corresponding to the hole shape in the captured image is subjected to a process such as binarization, and a peripheral portion thereof, that is, an edge portion of the rolling roll is extracted, and the extracted edge is extracted.
- a process such as binarization
- a peripheral portion thereof that is, an edge portion of the rolling roll is extracted
- the extracted edge is extracted.
- the groove bottom of each rolling roll can be detected (for example, the edge where the distance is the longest is detected as the groove bottom).
- the position of the midpoint of the line connecting the groove bottoms detected in this way can be calculated as the center position of the area corresponding to the hole shape.
- the signal processing device extracts an edge portion of each of the rolling rolls by sub-pixel processing based on a density gradient between two adjacent pixels.
- the edge portion of the rolling roll is extracted by sub-pixel processing based on the density gradient between two adjacent pixels instead of simple binary shading, the extraction accuracy of the edge portion is extracted.
- the accuracy of calculating the center position of the region corresponding to the hole shape is extracted.
- the signal processing device includes an image memory having a 10-bit gradation or higher, and is configured to perform the processing on a captured image taken into the image memory from the imaging device. You.
- the captured image can be reproduced.
- Density resolution is increased from 256 gradations to 1024 gradations. It is possible to extract each time.
- the reference means whose positional relationship with the pass line of the multi-high rolling mill has been clarified in advance, and the groove formed by the rolling roll of each stand (by the roll profile of the rolling roll). (Enclosed area) in the same field of view and calculate the position corresponding to the pass line based on the area corresponding to the reference means in the captured image, while calculating the position corresponding to the hole type in the captured image. A center position is calculated, and the misalignment amount of the hole is calculated based on the calculated center position and a position corresponding to the calculated pass line.
- the present invention even if the path line of the multi-high rolling mill and the optical axis to be imaged do not coincide, as long as the reference means and the die are imaged in the same field of view, the amount of misalignment can be accurately determined. This has an excellent effect that the measurement can be performed.
- FIG. 1 is a side view showing a schematic configuration of a misalignment measuring apparatus according to an embodiment of the present invention in a state where the misalignment measuring apparatus is installed in a multi-high rolling mill.
- FIGS. 2A and 2B are diagrams showing a schematic configuration of the lighting device, wherein FIG. 2A is a perspective view, and FIG. 2B is a front view showing a state where the lighting device is arranged between stands.
- FIGS. 3A and 3B show an example of a captured image of the calibration jig captured by the image capturing device, wherein FIG. 3A shows a raw image, and FIG. Is shown.
- FIGS. 4A and 4B are enlarged views of a region corresponding to the laser spot S included in the captured image, wherein FIG. 4A illustrates a captured image when the second target member is stationary, and FIG. 2 shows a captured image when the target member is rotated.
- FIG. 5 is a diagram schematically illustrating an example of a captured image.
- FIGS. 6A and 6B are diagrams for explaining the sub-pixel processing used when extracting the edge portion of each rolling roll.
- FIG. 6A shows the general concept of binary pixel shading
- FIG. 6B shows the concept of the sub-pixel processing. Is shown.
- FIG. 7 is a diagram illustrating a method of detecting the groove bottom of each rolling roll.
- FIG. 8 is a diagram showing the measured misalignment.
- FIG. 8A shows the misalignment before correction of misalignment.
- b) shows the amount of misalignment after the misalignment correction.
- FIG. 1 is a side view showing a schematic configuration of a misalignment measuring apparatus according to an embodiment of the present invention in a state where the misalignment measuring apparatus is installed in a multi-high rolling mill.
- the multi-high rolling mill M in the present embodiment is a sizer / mill having 12 stands in which three rolling rolls R are incorporated in each housing H.
- the apparatus for measuring misalignment according to the present embodiment includes a rolling roll R (# 2, # 10 in FIG. 1 for convenience) of each stand (# 1 to # 12) constituting a multi-high rolling mill M. This is for measuring the amount of misalignment of the groove formed by the groove (the area surrounded by the grooved profile of each rolling roll R of each stand) formed by the method shown in FIG.
- the apparatus includes a device 2 and a signal processing device (image processing device) 3.
- the misalignment amount measuring apparatus includes the first target member 4 disposed at each stand or between the stands (located at each stand in the present embodiment), and the imaging device 2. And a laser light source 5 for emitting a laser beam L toward the first target member 4.
- the misalignment measuring apparatus includes an illuminating device 6, a calibration jig 7A including the second target member 7, and a movable stage 8.
- the reference means 1 is arranged at each stand or between stands (arranged at each stand in the present embodiment), and the positional relationship with the pass line of the multi-high rolling mill M is clarified in advance. More specifically, the reference means 1 according to the present embodiment is a laser spot irradiated on the first target member 4 from the laser light source 5.
- the laser spot illuminated on the first target member 4 can be recognized. Also, the positional relationship with the pass line of the multi-high rolling mill M is clarified in advance.
- the first target member 4 is attached to the lighting device 6 and fixed to a predetermined position between the stands as described later, so that the first target member 4 is irradiated onto the first target member 4. It is possible to clarify the positional relationship between the laser spot and the pass line of the multi-high rolling mill M.
- the imaging device 2 is provided on the loading side or unloading side (the unloading side in the present embodiment) of the multi-high rolling mill M, and is opposed to the multi-high rolling mill M, and has a hole formed by the rolling roll R of each stand.
- the mold and the laser spot (reference means 1) are arranged so that they can be imaged in the same field of view.
- the imaging device 2 according to the present embodiment uses a two-dimensional CCD camera, and the camera is provided with a zoom lens 21 and a lens controller 22 for adjusting zooming of the zoom lens 21.
- the signal processing device 3 includes an image memory having a 10-bit gradation or more, performs image processing on the captured image captured from the imaging device 2 into the image memory, and calculates the hole-shaped misalignment amount. It is configured as follows. More specifically, the signal processing device 3 calculates a position corresponding to the pass line in the captured image based on the position of the laser spot in the loss image.
- a center position of a region corresponding to the hole shape in the captured image is calculated, and the center misalignment amount of the hole shape is calculated based on the calculated center position and the position corresponding to the calculated pass line. calculate.
- the imaging device 2 and the signal processing device 3 according to the present embodiment are both configured to have a resolution of 1,000,000 pixels or more (1000 ⁇ 1000) in order to improve measurement accuracy, and the field of view of the imaging device 2 is Each stand (# 11- # 12) is approximately 500 mm square.
- the laser light source 5 is mounted on the movable stage 8 so that the direction of the laser light L emitted from the laser light source 5 can be adjusted.
- the movable stage 8 includes a tilt stage and a Z-axis stage (vertical movable stage) for performing vertical adjustment with respect to the laser light L, and a horizontal adjustment with respect to the laser light L. It is composed of a combination of a rotary stage (rotating in the direction perpendicular to the paper surface in Fig. 1) and an X-axis stage (horizontal movable stage: movable in the direction perpendicular to the paper surface in Fig. 1).
- the laser light source is mounted on 8.
- the movable stage 8 is further provided with the imaging device 2.
- the direction of the laser light L emitted from the laser light source 5 and the light of the imaging device 2 are adjusted.
- the direction of the shaft can be integrally adjusted.
- FIG. 2 is a diagram showing a schematic configuration of the lighting device, (a) is a perspective view, and (b) is between stands.
- positioning state is each shown.
- the illumination device 6 is arranged between the stands, and illuminates the hole from the side opposite to the side where the imaging device 2 is arranged.
- the lighting device 6 includes a diffuser plate 61 and a plurality of small light sources 62 arranged annularly behind the diffuser plate 61.
- the power of using a 40 W white light bulb as the small light source 62 is not limited to this.
- Various light sources such as a halogen lamp can be used.
- fluorescent lamps require 60Hz flickering in the case of commercial power supply, so it is necessary to use a high frequency power supply that is not preferable.
- a white resin such as Teflon (registered trademark) is used as a material for forming the diffusion plate 61.
- Teflon registered trademark
- it can be selected from various materials. It is possible. Since the diffusion plate 61 can shield the edge of the rolling roll R serving as the background, the signal processing device 3 does not erroneously recognize the edge of the rolling roll 6 to be measured.
- the lighting device 6 includes a shaft portion 64, and can slide the light source 62 and the diffusion plate 61 along the shaft portion 64. Accordingly, the positions of the light source 62 and the diffusion plate 61 can be adjusted, and illumination can be appropriately performed according to the surface state diameter of the rolling roll R.
- the lighting device 6 includes a black-based shielding plate 65 that shields light in front of the diffusion plate 61. With such a shielding plate 65, it is possible to prevent a measurement error due to the wrapping of the illumination light onto the rolling roll R to be measured and a halation phenomenon due to an excessive light amount. It is preferable that the shielding plate 65 has an appropriate size according to the size of the rolling roll 6.
- a calibration window 63 made of the same material as that of the diffusion plate 61 is incorporated at the front end of the central portion of the lighting device 6, and the back force is also illuminated by the light source 66.
- the first target member 4 is attached to the side of the calibration window 63.
- the first target member 4 is pivoted to a rotary motor (not shown) so that it can move at least once in a plane substantially perpendicular to the emission direction of the laser light source 5 during the imaging cycle of the imaging device 2. Supported.
- the lighting device 6 having the above-described configuration uses the hook 68 provided at the end of the arm 67 extending radially from the shaft portion 64 to the cooling roll R provided for cooling the rolling roll R provided on the side wall of each stand. By being engaged with the water pipe, it is attached between the stands.
- the mounting position of the illuminating device 6 is preferably located at the center of the hole as much as possible, but it is only necessary that the illuminating device 6 be positioned in a range where the laser spot does not deviate from the first target member 4.
- the second target member 7 is provided between the two stands (# 1 and # 11 in the present embodiment) of the multi-high rolling mill M within the field of view of the imaging device 2 and the laser light source. 5 Force It is arranged at the position where the emitted laser light L is irradiated. Thereby, the positional relationship between the second target member and the pass line of the multi-high rolling mill M becomes clear in advance.
- the calibration jig 7A is fixed at a predetermined position of the # 1 stand and the # 11 stand, and the positional relationship with the pass line of the multi-high rolling mill M is previously defined. Accordingly, the positional relationship between the second target member 7 included in the calibration jig 7A and the pass line of the multi-high rolling mill M is clarified in advance.
- the second target member 7 is pivotally supported by a rotary motor (not shown) so as to move at least once in a plane substantially perpendicular to the emission direction of the laser light source 5 during the imaging cycle of the imaging device 2. ing.
- the calibration jig 7A is illuminated by the illumination 9.
- Step 1 Adjustment of laser beam direction
- the direction of the laser light L is adjusted using the movable stage 8 so that the laser light L emitted from the laser light source 5 and the nosline of the multi-high rolling mill M are parallel.
- the laser light source 5 and the imaging device 2 are placed on the movable stage 8, and the laser light L emitted from the laser light source 5 and the optical axis of the imaging device 2 are set in advance in a substantially parallel manner.
- the housing of the laser light source 5 and the housing of the imaging device 2 are mechanically arranged in parallel), and these are installed on the unloading side of the multi-high rolling mill M.
- the calibration jig 7A is attached to each of the two stands (# 1 and # 11) of the multi-high rolling mill M. Specifically, the calibration jig 7A is pressed to one side and attached with bolts to the jigs provided on both sides of the side wall of each stand in advance so that it can be positioned with respect to the pass line, and illuminated by the illumination 9. .
- Each of the above calibration jigs 7A is a second target member provided in each of the calibration jigs 7A.
- the mechanical dimensions and the mounting position are determined in advance so that the position of the center of gravity of 7 is equidistant in the horizontal and vertical directions from the pass line.
- the imaging device 2 takes an image of one of the calibration jigs 7A, stores the taken image in the signal processing device 3, and then changes the zoom of the zoom lens 21 (when the magnification is approximately Then, image the other calibration jig 7A.
- FIGS. 3A and 3B show an example of a captured image of the calibration jig captured by the image capturing device, wherein FIG. 3A shows a raw image, and FIG. Is shown.
- the captured image in FIG. 3 is an example of one of the calibration jigs 7A (the calibration jig attached to # 11) .
- the captured image includes the calibration jig 7A. And a region corresponding to the laser spot S irradiated on the second target member 7 to be irradiated.
- the calibration jig 7A has an opening 7B at the center, the other calibration jig 7A (the calibration jig attached to # 1) can be imaged through the opening 7B. is there.
- the center of gravity (Xl, Y1) of the area corresponding to the second target member 7 and the center of gravity (X2, Y2) of the area corresponding to the laser spot S are calculated.
- the calculated center-of-gravity positions (Xl, Y1) and (X2, Y2) are taken as the actual size of the second target member 7 (diameter 20 mm ⁇ in this embodiment) so that adjustment by the movable stage 8 becomes easy.
- the actual size is converted based on the relationship between the size (pixel unit) of the second target member 7 in the image.
- the laser beam L emitted from the light source 5 and the nosline of the multi-high rolling mill M can be adjusted substantially in parallel.
- the procedure for moving the movable stage 8 includes, for example, (a) vertical adjustment (after adjusting the tilt of the tilt stage so that the difference between Y1 and Y2 is substantially equal for each captured image, and then adjusting the difference between Y1 and Y2). After adjusting the height of the Z-axis stage to approach the force ⁇ ), (b) horizontal adjustment (rotation angle of the rotation stage so that the difference between XI and X2 is almost the same for each captured image) After adjusting the position, adjust the position of the X-axis stage so that the difference between XI and X2 approaches 0) .However, the procedure for reversing the order of (a) and (b) above may be considered. Adoption is possible.
- the calculation of the center of gravity position (Xl, Y1) and (X2, Y2), the adjustment amount in the vertical direction (the adjustment amount of the tilt stage, the adjustment amount of the Z-axis stage), and the adjustment amount in the horizontal direction (the rotation stage) are automatically calculated by the signal processing device 3, which makes it possible to perform the adjustment work extremely easily.
- the image pickup device 2 is also mounted on the same movable stage 8 as the laser light source 5, so that the optical axis and the pass line of the image pickup device 2 are automatically set. It will be adjusted substantially in parallel.
- the second target member 7 is supported by a rotating motor (not shown), and when the imaging device 2 captures an image of the calibration jig 7A, the second motor 7 is driven. Thus, the second target member 7 can be rotated.
- FIGS. 4A and 4B are enlarged views of a region corresponding to the laser spot S included in the captured image, wherein FIG. 4A illustrates a captured image when the second target member 7 is stationary, and FIG. 3 shows a captured image when the second target member 7 is rotated.
- Calibration work is performed so that the amount of misalignment of the rolling roll R can be calculated as an actual dimension. Specifically, first, after the lighting device 6 is inserted behind the rolling roll R to be measured, the light sources 62 and 66 are turned on. Next, the zoom of the zoom lens 21 is changed, and the visual field at the installation position of the rolling roll R to be measured is adjusted.
- the zoom of the zoom lens 21 may be changed by manually operating a predetermined switch of the lens controller 22, or the lens controller 22 may have a preset function, and the number of the stand to be measured may be input. When the zooming is completed automatically with, a simple method may be used.
- the signal processing device 3 has a function of calculating a density profile / density histogram for an arbitrary region in the captured image and displaying the histogram on a monitor screen.
- the brightness adjustment of the illumination device 6 and the like can be easily performed. After turning on the lighting device 6 and changing the zoom of the zoom lens 21, the imaging device 2 captures an image of the hole formed by the rolling roll R.
- an area corresponding to the calibration window 63 which is imaged at the same time, is extracted by the signal processing device 3 (extracted by binarization or the like). Subsequently, the dimensions of the extracted calibration window 63 are compared with the actual dimensions (100 mm diameter in the present embodiment) determined at the time of manufacture, and a correction rate (conversion rate) to the actual dimensions is calculated. .
- a method of calculating the dimension (diameter) of the calibration window 63 so that the calibration error is reduced even if the calibration window 63 is inclined a method of selecting the maximum diameter on a captured image is preferable.
- the misalignment amount of the hole type is calculated for each stand. Specifically, first, while emitting laser light from the laser light source 5 toward the rotated first target member 4, uniform light is emitted from the light source 62 to the rolling roll R to be measured via the diffusion plate 61. Irradiate to image the mold.
- FIG. 5 is a diagram schematically illustrating an example of a captured image.
- the position corresponding to the pass line in the captured image is calculated by the signal processing device 3 based on the area corresponding to the laser spot 1 in the captured image. More specifically, the position of the center of gravity of the area corresponding to the laser spot 1 is calculated first, and the captured image is calculated based on the positional relationship between the center of gravity of the laser spot 1 and the pass line stored in the signal processing device 3 in advance. Calculate the position (mechanical mill center) corresponding to the pass line in the inside.
- FIG. 6 is an explanatory diagram illustrating sub-pixel processing used when extracting the edge portion of each rolling roll in the misalignment amount measuring apparatus according to the present embodiment.
- (B) shows the concept of sub-pixel processing.
- the signal processing device 3 according to the present embodiment employs an algorithm for extracting an edge portion of each roll by performing sub-pixel processing based on a density gradient between two adjacent pixels.
- the density of three consecutive pixels A, B, and C near the edge is 30, 70, and 100, respectively, and the binarization threshold (binary level ) Is 90, the edge portion detected by ordinary binary shading is the pixel C, and the resolution is one pixel unit (0.5 mm in the present embodiment).
- the edge portion can be detected with a resolution of one pixel unit or less.
- the average density of the area corresponding to the calibration window 63 in the captured image is adopted as the 2 ⁇ level for performing the sub-pixel processing.
- FIG. 7 is a diagram illustrating a method of detecting a groove bottom.
- a groove bottom of each of the rolls is detected based on a distance between the extracted edge portion and a pixel corresponding to the calculated mechanical mill core or a pixel in the vicinity thereof.
- the edge E1 of the extracted rolling roll R1 and the mechanical mill core P1 are detected.
- the pixel adjacent to the pixel corresponding to the mechanical mill core P1 in the present embodiment, ⁇ 10 in the horizontal direction with respect to the mechanical mill core P1). Calculate the vertical distance from (pixel + 10 pixels), and detect the pixel at the edge E1 where the calculated distance is the longest as the groove bottom B1.
- the entire image is rotated 120 ° clockwise around the mechanical mill core P1.
- the pixel of the edge portion E2 where the calculated distance becomes the longest is detected as the groove bottom B2.
- the entire image was rotated 120 ° counterclockwise around the mechanical mill core P1.
- the pixel at the edge portion E3 where the calculated distance is the longest is detected as the groove bottom B3.
- the signal processing device 3 sets the center position of the virtual circle C passing through the groove bottoms Bl, B2, and B3 of the detected rolls to the center position of the area corresponding to the mold (the mold core). It is calculated as P2 (X2, Y2).
- the misalignment amount is calculated based on the mechanical mill core P1 (X1, Y1) and the hole-shaped core ⁇ 2 ( ⁇ 2, ⁇ 2). More specifically, the amount of misalignment in the horizontal direction is calculated by Y ⁇ 2, and the amount of misalignment in the vertical direction is calculated by Y1—2.
- L1 is the distance between the groove bottom B1 and the mechanical mill core P1
- L2 is the distance between the groove bottom B2 and the mechanical mill core PI
- L3 is the distance between the groove bottom B3 and the mechanical mill core PI.
- the present invention is not limited to this.
- Two rolling rolls facing each stand are not limited to this.
- the present invention is also applicable to the arranged multi-high rolling mill. However, in the case of such a multi-high rolling mill, since only two groove bottoms can be detected, a virtual circle passing through the groove bottoms cannot be uniquely determined.
- the entire image is set at a predetermined angle around the mechanical mill core P1 such that the two extracted edge portions are located above and below in the captured image, respectively. Then, the bottom of the groove of each rolling roll is detected in the same manner as in the case where the three rolling rolls are arranged as described above. Subsequently, it is possible to calculate the position of the midpoint of the detected line connecting the groove bottoms of the rolling rolls as the center position of the area corresponding to the groove shape.
- step 3 the lighting device 6 is removed, and the process is performed from step 2 on the roll R to be measured next.
- steps are used in multi-high rolling mills By performing the process on all the rolling rolls R constituting M, it is possible to calculate the position coordinates of the core in all the stands.
- Step 5 misalignment status display
- the status of misalignment across all stands is displayed to visually grasp the amount of misalignment at each stand. Specifically, after the measurement is completed for all the stands to be measured in accordance with the above procedure 2-4, the amount of misalignment of the hole type of each stand with respect to the noise line is displayed on the monitor screen connected to the image processing apparatus 3. Is displayed in a list.
- FIGS. 8A and 8B are diagrams showing the measured misalignment, wherein FIG. 8A shows the misalignment before the misalignment is corrected, and FIG. 8B shows the misalignment after the misalignment is corrected.
- the position correction amount of each rolling roll required for correcting the misalignment is calculated by the signal processing device 3 as described above, the position correction amount may be displayed on a monitor screen. As shown in Fig. 8 (b), by applying the misalignment measuring device according to the present embodiment, the centering accuracy which was initially about ⁇ lmm can be adjusted to ⁇ 0.5mm or less. Noh.
- the misalignment measuring force which usually takes about once every three months and takes two to three days, is at least once a month at the time of setup change or the like. With this frequency, the force could be measured within two hours.
- adjustments are made based on the measurement results, thereby reducing product defects such as uneven thickness and flaws due to misalignment, and improving product quality. Possibility of industrial use has been improved
- a reference means whose positional relationship with the pass line of the multi-high rolling mill is defined in advance, and a roll formed by each stand. While capturing the same die shape (the area surrounded by the die profile of the rolling roll) in the same field of view, and calculating the position corresponding to the noise line based on the region corresponding to the reference means in the captured image, Corresponding to the hole type in the captured image The center position of the region to be calculated is calculated, and the misalignment amount of the hole type can be calculated based on the calculated center position and the calculated position corresponding to the pass line.
- the amount of misalignment can be accurately measured as long as the reference means and the die are imaged in the same field of view.
- the holding force By adjusting the holding force based on the measurement result, product defects such as uneven thickness and flaws due to misalignment can be reduced and the quality of the product can be improved. it can.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
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DE602004030471T DE602004030471D1 (de) | 2003-10-07 | 2004-10-07 | Verfahren zur messung der fehlausrichtung eines mehrstufigen walzwerks und messvorrichtung dafür |
EP04792124A EP1679137B1 (en) | 2003-10-07 | 2004-10-07 | Method of measuring misalignment of multi-stage rolling mill and measuring device therefor |
US11/399,324 US7320237B2 (en) | 2003-10-07 | 2006-04-07 | Method for measuring misalignment of continuance mill and apparatus for measuring the same |
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JP2003-348790 | 2003-10-07 | ||
JP2003348790A JP4300518B2 (ja) | 2003-10-07 | 2003-10-07 | 多段圧延機の芯ずれ量測定装置 |
Related Child Applications (1)
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US11/399,324 Continuation US7320237B2 (en) | 2003-10-07 | 2006-04-07 | Method for measuring misalignment of continuance mill and apparatus for measuring the same |
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WO2005035155A1 true WO2005035155A1 (ja) | 2005-04-21 |
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US (1) | US7320237B2 (ja) |
EP (1) | EP1679137B1 (ja) |
JP (1) | JP4300518B2 (ja) |
CN (1) | CN100396392C (ja) |
DE (1) | DE602004030471D1 (ja) |
WO (1) | WO2005035155A1 (ja) |
Cited By (4)
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CN108700866A (zh) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | 轧机机架的辊缝的在线校准 |
CN111421001A (zh) * | 2019-01-10 | 2020-07-17 | 宝山钢铁股份有限公司 | 一种高速线材轧机在线精确对中系统及其对中方法 |
CN114608421A (zh) * | 2022-02-25 | 2022-06-10 | 浙江久立特材科技股份有限公司 | 一种用于新型轧机孔型的对中测量工具及检测方法 |
CN115265418A (zh) * | 2022-06-13 | 2022-11-01 | 核工业理化工程研究院 | 一种多台串联设备同轴度安装用辅助工装、安装方法及其应用 |
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WO2011041294A1 (en) * | 2009-09-30 | 2011-04-07 | Og Technologies, Inc. | A method and apparatus of a portable imaging-based measurement with self calibration |
CN101869971A (zh) * | 2010-05-31 | 2010-10-27 | 北京科技大学 | 连铸机结晶器足辊工作状态在线监测仪及其监测方法 |
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DE102014005332A1 (de) | 2014-04-11 | 2015-10-15 | Sms Meer Gmbh | Umformmaschine, insbesondere Ringwalzmaschine |
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DE102018003434A1 (de) | 2018-04-27 | 2019-10-31 | Sms Group Gmbh | Schrägwalzwerk mit hydraulischer Walzenanstellung |
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CN114789884B (zh) * | 2022-04-01 | 2023-12-05 | 中石化石油机械股份有限公司沙市钢管分公司 | 基于激光技术的防腐自动追管装置及追管方法 |
DE102022129593A1 (de) | 2022-07-01 | 2024-01-04 | Sms Group Gmbh | Bestimmungsverfahren zur Bestimmung der Walz- bzw. Führungskaliber der Walzgerüste bzw. Führungsgerüste in einer mehrgerüstigen Walzanlage |
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- 2004-10-07 WO PCT/JP2004/014826 patent/WO2005035155A1/ja active Application Filing
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CN108700866A (zh) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | 轧机机架的辊缝的在线校准 |
US11173529B2 (en) | 2016-02-22 | 2021-11-16 | Primetals Technologies Austria GmbH | In-line calibration of the roll gap of a roll stand |
CN111421001A (zh) * | 2019-01-10 | 2020-07-17 | 宝山钢铁股份有限公司 | 一种高速线材轧机在线精确对中系统及其对中方法 |
CN111421001B (zh) * | 2019-01-10 | 2021-08-17 | 宝山钢铁股份有限公司 | 一种高速线材轧机在线精确对中系统及其对中方法 |
CN114608421A (zh) * | 2022-02-25 | 2022-06-10 | 浙江久立特材科技股份有限公司 | 一种用于新型轧机孔型的对中测量工具及检测方法 |
CN115265418A (zh) * | 2022-06-13 | 2022-11-01 | 核工业理化工程研究院 | 一种多台串联设备同轴度安装用辅助工装、安装方法及其应用 |
Also Published As
Publication number | Publication date |
---|---|
JP2005114536A (ja) | 2005-04-28 |
EP1679137A1 (en) | 2006-07-12 |
CN100396392C (zh) | 2008-06-25 |
US20070036426A1 (en) | 2007-02-15 |
US7320237B2 (en) | 2008-01-22 |
DE602004030471D1 (de) | 2011-01-20 |
EP1679137A4 (en) | 2007-05-02 |
EP1679137B1 (en) | 2010-12-08 |
JP4300518B2 (ja) | 2009-07-22 |
CN1863611A (zh) | 2006-11-15 |
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