JP2011140050A - Method of inspecting off center of roll in rolling mill for manufacturing steel bar - Google Patents

Abstract

Provided is a roll misalignment inspection method for a rolling mill for manufacturing a steel bar, which can accurately inspect whether or not a misalignment exceeding an allowable range has occurred in a rolling roll forming a hole mold of the rolling mill for manufacturing a steel bar. To do.
Laser pointers 21a, 21b, and 21c are attached to an illuminating device 15 that projects illumination light onto a hole mold of a steel bar manufacturing mill, and the illumination light that has passed through the hole mold is received and converted into an image signal. The target plate 23 is attached to the imaging device 16 to be moved, and the amount of deviation between the optical axis of the illumination device 15 and the optical axis of the imaging device 16 from the irradiation position of the laser light irradiated to the target plate 23 from the laser pointers 21a, 21b, 21c , And the optical axis of the illumination device 15 and the optical axis of the imaging device 16 are matched based on the measurement result of the deviation amount, and then the image signal output from the imaging device 16 is processed to form a hole shape. The misalignment of the rolling roll 14 is inspected.
[Selection] Figure 1

Description

  The present invention relates to a method for inspecting whether or not a misalignment exceeding an allowable range occurs in a rolling roll of a rolling mill for manufacturing a steel bar.

An example of the rolling mill used when manufacturing a steel bar is shown in FIG. A rolling mill 10 shown in FIG. 10 includes two rolling stands 11 and 12 in front and rear, and the rolling stands 11 and 12 are configured to roll a steel bar material R such as a billet.
Each of the rolling stands 11 and 12 has a hole mold 13 through which the steel bar material R passes. These hole molds 13 have, for example, four rolling rolls 14 whose outer peripheral surfaces are recessed in an arc shape, and the shape of the hole mold 13 is circular. Are arranged and formed.

In such a rolling mill for manufacturing a steel bar, when the center of each rolling roll 14 forming the hole mold 13 is in a predetermined position, the shape of the hole mold 13 is circular, so that a steel bar having a circular cross section can be obtained. it can. However, when the center of the rolling roll 14 is greatly deviated from a predetermined position, the shape of the hole mold 13 does not become a circle, which causes a defective product.
In order to prevent the occurrence of such defective products, it is necessary to inspect whether or not a misalignment exceeding an allowable range occurs in the rolling roll 14 forming the hole mold 13. Therefore, as shown in FIG. 11, illumination light is projected from the illumination device 15 disposed on the front side or rear side of the hole mold 13 to the hole mold 13 of the steel bar manufacturing rolling mill 10 and passes through the hole mold 13. The illuminating light received by the imaging device 16 disposed on the rear side or the front side of the hole mold 13 is converted into an image signal, and the image signal output from the imaging device 16 is processed by the image processing device 17 and rolled. 14 methods for inspecting misalignment have been proposed (see, for example, Patent Document 1).

Japanese Patent No. 3835640

However, in the above-described method, when the optical axis of the illumination device 15 and the optical axis of the imaging device 16 coincide with each other, it is possible to accurately inspect whether or not the misalignment exceeding the allowable range occurs in the rolling roll 14, When the optical axis of the illuminating device 15 and the optical axis of the imaging device 16 do not coincide with each other, it is difficult to accurately inspect the misalignment of the rolling roll 14.
The present invention has been made paying attention to the above-mentioned problems, and it is possible to accurately inspect whether or not a misalignment exceeding an allowable range has occurred in a rolling roll forming a hole mold of a rolling mill for manufacturing a steel bar. An object of the present invention is to provide a roll misalignment inspection method for a rolling mill for manufacturing a steel bar.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention projects illumination light from a lighting device arranged on the front side or rear side of a hole mold of a rolling mill for manufacturing steel bars. The rolling roll that receives the illumination light that has passed through the hole mold by an imaging device disposed on the rear side or front side of the hole mold, converts the illumination light into an image signal, and processes the image signal to form the hole mold A roll misalignment inspection method for a rolling mill for manufacturing a steel bar for inspecting misalignment of a steel bar, wherein the imaging device faces the laser pointer from at least three laser pointers mounted on one of the illumination device or the imaging device. Alternatively, the target plate mounted on the other of the illumination device is irradiated with laser light, and the optical axis of the illumination device and the optical axis of the imaging device are aligned based on the irradiation position of the laser light applied to the target plate. After the rolling Wherein the inspecting misalignment Lumpur.

  The invention according to claim 2 of the present invention is the method for inspecting misalignment of a rolling mill for steel bar manufacturing according to claim 1, wherein the laser pointer is the illumination device in which the optical axis of the laser pointer is mounted with a laser pointer, or the The target plate is irradiated with laser light in parallel with the optical axis of the imaging device and at equal intervals on the same circumference around the optical axis of the illumination device or the imaging device.

  The invention according to claim 3 of the present invention is the method for inspecting misalignment of a rolling mill for manufacturing steel bars according to claim 1 or 2, wherein the optical axis of the illumination device and the optical axis of the imaging device are on the same straight line. A plurality of reference irradiation position marks indicating the reference irradiation positions of the laser light irradiated from the laser pointer to the target plate are formed on the target plate, and the irradiation position of the laser light on the target plate is the reference irradiation. The optical axis of the illuminating device and the optical axis of the imaging device are matched by adjusting the position of the illuminating device and / or the imaging device so as to coincide with a position mark.

  According to the first aspect of the present invention, it is possible to determine whether or not there is a deviation of the optical axis between the illumination device and the imaging device from the irradiation position of the laser beam irradiated to the target plate from the laser pointer, and Since it becomes possible to accurately match the optical axes of the illumination device and the imaging device when inspecting misalignment of the rolling roll, the rolling roll forming the hole mold of the steel bar manufacturing mill exceeds the allowable range. It is possible to accurately inspect whether misalignment has occurred.

  According to the second aspect of the present invention, the optical axis shift generated between the illumination device and the imaging device is a translational shift (the optical axis of the illumination device and the optical axis of the imaging device are shifted in parallel). ) Or an inclination shift (a state in which the optical axis of the illumination device is inclined with respect to the optical axis of the imaging device). Therefore, it is possible to more accurately determine whether or not a misalignment exceeding an allowable range has occurred in the rolling roll forming the hole mold of the rolling mill for manufacturing a steel bar. Can be inspected.

  According to the third aspect of the present invention, it is possible to more accurately measure the amount of deviation of the optical axis generated between the illumination device and the imaging device, thereby illuminating when inspecting the misalignment of the rolling roll. Since the optical axis of the apparatus and the optical axis of the imaging apparatus can be matched more accurately, whether or not misalignment exceeding an allowable range has occurred in the rolling roll forming the hole mold of the rolling mill for bar steel production Can be inspected more accurately.

It is a figure which shows an example of the position shift amount measuring device used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a side view which shows an example of the optical-axis adjustment tool for illuminating devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a front view which shows an example of the optical-axis adjustment tool for illuminating devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a top view which shows an example of the optical axis adjustment tool for illuminating devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a side view which shows an example of the optical-axis adjustment tool for imaging devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a front view which shows an example of the optical-axis adjustment tool for imaging devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. It is a top view which shows an example of the optical-axis adjustment tool for imaging devices used when implementing the roll misalignment inspection method of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention. The irradiation position of the laser beam irradiated from the laser pointer to the target plate when the optical axis of the illuminating device that irradiates the hole mold of the rolling mill for manufacturing the steel bar is shifted in parallel to the optical axis of the imaging device. It is a figure shown typically. Schematic of the irradiation position of the laser beam irradiated from the laser pointer to the target plate when the optical axis of the illuminating device that irradiates the hole mold of the rolling mill for steel bar manufacturing is inclined with respect to the optical axis of the imaging device FIG. It is a figure which shows an example of the rolling mill for steel bar manufacture. It is a figure for demonstrating the subject which this invention tends to solve.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part as what was shown in FIG. 11, and the detailed description is omitted.
First, FIG. 1 shows an example of a misalignment measuring device used when carrying out a roll misalignment inspection method for a rolling mill for manufacturing steel bars according to an embodiment of the present invention. In FIG. 1, reference numerals 21 a, 21 b, and 21 c denote laser pointers, reference numeral 22 denotes the laser pointers 21 a, 21 b, and 21 c, and the optical axes of these laser pointers are parallel to the optical axis of the illumination device 15 and the optical axis of the illumination device 15. Is a laser pointer holding plate which is held at equal intervals (for example, 120 ° intervals) on the same circumference, and a reference numeral 23 is a target plate irradiated with laser light from the laser pointers 21a, 21b and 21c. 21 a, 21 b, 21 c are attached to the illumination device 15 via a laser pointer holding plate 22.

  On the other hand, the target plate 23 is mounted on the imaging device 16 so as to face the laser pointers 21a, 21b, and 21c, and the optical axis of the illumination device 15 and the optical axis of the imaging device 16 are on the same straight line. In some cases, reference irradiation position marks 24a, 24b, and 24c indicating the reference irradiation position of the laser light irradiated to the target plate 23 from the laser pointers 21a, 21b, and 21c are formed, and the laser light irradiated to the target plate 23 Cross-shaped scales 25a, 25b, and 25c for measuring the amount of deviation between the optical axis of the illumination device 15 and the optical axis of the imaging device 16 from the irradiation position are formed around the reference irradiation position marks 24a, 24b, and 24c. ing.

  The illuminating device 15 includes a light source 151 disposed to face the hole mold of the steel bar manufacturing mill, and a telecentric lens 152 disposed between the light source 151 and the hole mold. It is composed of a two-dimensional CCD camera 161 disposed opposite to the hole mold of the steel bar manufacturing mill, and a telecentric lens 162 disposed between the two-dimensional CCD camera 161 and the hole mold.

Next, an example of the optical axis adjuster for an illuminating device and the optical axis adjuster for an imaging device used when carrying out the roll misalignment inspection method for a rolling mill for manufacturing a steel bar according to an embodiment of the present invention is shown in FIGS. As shown in FIG.
2 to 4 is used when adjusting the optical axis angle and the optical axis position of the illuminating device 15, and holds the telecentric lens 152 of the illuminating device 15. Lens holder 27, a pair of left and right horizontal shafts 28, 29 projecting from the lens holder 27 in the horizontal direction perpendicular to the optical axis of the telecentric lens 152, and the lens holder 27 horizontally through these horizontal shafts 28, 29. A first lens holder support member 30 that is supported so as to be pivotable about an arbitrary axis, a vertical shaft 31 that protrudes downward from the center of the lower surface of the first lens holder support member 30, and the vertical shaft 31. A second lens holder support member 32 that supports the lens holder 27 so as to be rotatable about a vertical axis, and the second lens holder support member 32 is used as the telecentric lens 1. And a fixed support base 33 which movably supports a horizontal direction perpendicular to the second optical axis.
The first lens holder support member 30 has fixing screws 34 and 35 that fasten and fix the horizontal shafts 28 and 29 in a non-rotatable manner. By loosening these fixing screws 34 and 35, the optical axis angle of the telecentric lens 152 is fixed. Can be adjusted vertically.

On the other hand, the second lens holder support member 32 has a fixing screw 36 for fixing the first lens holder support member 30 so as not to be rotatable around a vertical axis. By loosening the fixing screw 36, the telecentric lens is fixed. The optical axis angle 152 can be adjusted in the left-right direction.
The second lens holder support member 32 has a pair of left and right position adjusting screws 37 and 38 that abut on the left and right side surfaces of the fixed support base 33, and these position adjusting screws 37 and 38 serve as the second lens holder. The optical axis position of the telecentric lens 152 can be adjusted in the left-right direction by moving the support member 32 in the left-right direction.

5 to 7 are used when adjusting the optical axis angle and optical axis position of the imaging device 16 and hold the telecentric lens 162 of the imaging device 16. The lens holder 41, a pair of left and right horizontal shafts 42 and 43 projecting in a horizontal direction perpendicular to the optical axis of the telecentric lens 162, and the lens holder 41 through the horizontal shafts 42 and 43. A first lens holder support member 44 that is pivotally supported around a specific axis, a vertical shaft 45 that projects downward from the center of the lower surface of the first lens holder support member 44, and the vertical shaft 45. A second lens holder support member 46 that supports the lens holder 41 so as to be rotatable about a vertical axis, and the second lens holder support member 46 is a telecentric lens 1. And a stationary support base 47 which movably supports a horizontal direction perpendicular to the second optical axis.
The first lens holder support member 44 has fixing screws 48 and 49 that fasten and fix the horizontal shafts 42 and 43 in a non-rotatable manner. By loosening these fixing screws 48 and 49, the optical axis angle of the telecentric lens 162. Can be adjusted vertically.

On the other hand, the second lens holder support member 46 has a fixing screw 50 for fixing the first lens holder support member 44 so as not to be rotatable about a vertical axis. By loosening the fixing screw 50, the telecentric lens is fixed. The optical axis angle 162 can be adjusted in the left-right direction.
Further, the second lens holder support member 46 has a pair of left and right position adjusting screws 51 and 52 that come into contact with the left and right side surfaces of the fixed support base 47, and these position adjusting screws 51 and 52 serve as the second lens holder. By moving the support member 46 in the left-right direction, the optical axis position of the telecentric lens 162 can be adjusted in the left-right direction.

  FIG. 8 shows that when the optical axis of the illuminating device 15 is shifted in parallel with the optical axis of the imaging device 16 (so-called “translational shift” occurs), the laser pointers 21 a, 21 b, 21 c are moved from the target plate 23. FIG. 9 is a diagram showing the irradiation position of the laser beam irradiated to FIG. 9. FIG. 9 shows the case where the optical axis of the illumination device 15 is tilted with respect to the optical axis of the imaging device 16 (so-called “tilt deviation” occurs). It is a figure which shows the irradiation position of the laser beam irradiated to the target board 23 from the laser pointers 21a, 21b, 21c, and hereafter, with reference to FIG.8 and FIG.9, of the rolling mill for steel bar manufacture which concerns on one Embodiment of this invention A roll misalignment inspection method will be described.

  Using the illumination device 15, the imaging device 16, the laser pointers 21 a, 21 b, 21 c, the target plate 23, the illumination device optical axis adjustment tool 26, and the imaging device optical axis adjustment tool 40, the misalignment of the rolling roll 14 is performed. When inspecting, first, the target plate 23 is irradiated with laser light from the laser pointers 21a, 21b, and 21c, and the optical axis of the illumination device 15 and the light of the imaging device 16 are irradiated from the irradiation position of the laser light irradiated on the target plate 23. Measure the deviation from the axis.

Here, when the translational deviation as shown in FIG. 8A occurs between the optical axis of the illuminating device 15 and the optical axis of the imaging device 16, as shown in FIG. The laser beams LB ₁ , LB ₂ , and LB ₃ from the pointers 21a, 21b, and 21c are irradiated to the target plate 23 with the same distance from the reference irradiation position marks 24a, 24b, and 24c. Therefore, for example, by reading the distance A between the irradiation position of the laser beam LB ₁ irradiated to the target plate 23 and the reference irradiation position mark 24 a from the scale 25 a formed on the target plate 23, the optical axis of the illuminating device 15 and imaging. It is possible to measure how much translational deviation has occurred between the optical axis of the device 16.

In addition, when a tilt shift as shown in FIG. 9A occurs between the optical axis of the illumination device 15 and the optical axis of the imaging device 16, as shown in FIG. The laser beams LB ₁ , LB ₂ , and LB ₃ from 21a, 21b, and 21c are irradiated to the target plate 23 with different distances from the reference irradiation position marks 24a, 24b, and 24c, respectively. Accordingly, the scales 25a formed on the target plate 23 are distances A, B, C between the irradiation positions of the laser beams LB ₁ , LB ₂ , LB ₃ irradiated to the target plate 23 and the reference irradiation position marks 24a, 24b, 24c. , 25b, and 25c, it is possible to measure how much tilt deviation occurs between the optical axis of the illumination device 15 and the optical axis of the imaging device 16.

In this way, the amount of deviation between the optical axis of the illuminating device 15 and the optical axis of the imaging device 16 is measured, and when the measured value exceeds the allowable range, the optical axis adjusting tool 26 for the illuminating device described above or Using the imaging device optical axis adjuster 40, the illumination device 15 and the imaging device so that the irradiation positions of the laser beams LB ₁ , LB ₂ , and LB ₃ on the target plate 23 coincide with the reference irradiation position marks 24a, 24b, and 24c, respectively. After adjusting the position of the device 16 and matching the optical axis of the illumination device 15 with the optical axis of the imaging device 16, illumination light is projected from the illumination device 15 to the hole mold of the rolling mill for manufacturing steel bars. And the illumination light which passed the hole mold | die of the rolling mill for steel bar manufacture is received with the imaging device 16, the image signal output from the imaging device 16 is supplied to the image processing apparatus 17 (refer FIG. 11), and the rolling roll 14 Check for misalignment.

  As described above, by irradiating the target plate 23 with laser light from the laser pointers 21a, 21b, and 21c, the laser pointers 21a and 21b indicate whether or not the optical axis has shifted between the illumination device 15 and the imaging device 16. , 21c can be determined from the irradiation position of the laser beam irradiated to the target plate 23. Accordingly, when inspecting the misalignment of the rolling roll 14, the optical axes of the illumination device 15 and the imaging device 16 can be accurately matched, so that the rolling roll that forms the hole mold 13 of the rolling mill for manufacturing steel bars. 14 can be accurately inspected as to whether or not a misalignment exceeding the allowable range occurs.

Further, the three laser pointers 21a, 21b, and 21c are provided on the same circumference at equal intervals around the optical axis of the illuminating device 15, and the target plate 23 is irradiated with the laser light, whereby the illuminating device 15 and the imaging device 16 are provided. Between the illumination device 15 and the imaging device 16 when inspecting the misalignment of the rolling roll 14. Since it becomes possible to match | combine shafts more correctly, it is test | inspected more correctly whether the misalignment exceeding an allowable range has arisen in the rolling roll 14 which forms the hole mold 13 of the rolling mill for steel bar manufacture. Can do.
When the number of laser pointers is two or less, it is impossible to specify whether the optical axis shift is a translational shift or a tilt shift, and thus it is necessary to provide three laser pointers.

Furthermore, when the optical axis of the illumination device 15 and the optical axis of the imaging device 16 are on the same straight line, a reference irradiation position mark indicating the reference irradiation position of the laser light irradiated to the target plate 23 from the laser pointers 21a, 21b, 21c. By providing the target plate 23 with the laser beams 24a, 24b, and 24c and irradiating the target plate 23 with laser light, it is possible to more accurately measure the shift amount of the optical axis generated between the illumination device 15 and the imaging device 16. Thus, when inspecting the misalignment of the rolling roll 14, the optical axis of the illumination device 15 and the optical axis of the imaging device 16 can be more accurately matched. It is possible to more accurately inspect whether or not the misalignment exceeding the allowable range occurs in the formed roll 14.
In the embodiment of the present invention described above, the target plate 23 is irradiated with laser light from the laser pointers 21 a, 21 b, and 21 c mounted on the illumination device 15, and the optical axis of the illumination device 15 and the optical axis of the imaging device 16. The number of laser pointers may be four or more.

Further, in the above-described embodiment of the present invention, the example in which the target plate 23 irradiated with the laser light from the laser pointers 21a, 21b, and 21c is attached to the imaging device 16 is shown. The laser pointers 21a, 21b, and 21c may be attached to the imaging device 16.
Furthermore, in one embodiment of the present invention described above, the laser pointer holding plate 23 causes the laser pointers 21a, 21b, and 21c to be parallel to the optical axis of the illumination device 15 and on the same circumference around the optical axis of the illumination device 15. Although held at regular intervals, the laser pointers 21a, 21b, and 21c may be held at regular intervals on the same circumference around the optical axis of the imaging device 16 in parallel with the optical axis of the imaging device 16. .

DESCRIPTION OF SYMBOLS 10 ... Rolling machine for bar manufacturing 11,12 ... Rolling stand R ... Steel material 13 ... Hole type 14 ... Rolling roll 15 ... Lighting device 151 ... Light source 152 ... Telecentric lens 16 ... Imaging device 161 ... Two-dimensional CCD camera 162 ... Telecentric lens DESCRIPTION OF SYMBOLS 17 ... Image processing device 21a, 21b, 21c ... Laser pointer 22 ... Laser pointer holding plate 23 ... Target plate 24a, 24b, 24c ... Reference irradiation position mark 25a, 25b, 25c ... Scale 26 ... Optical axis adjustment tool for illumination devices 27 ... Lens holder 28, 29 ... Horizontal axis 30 ... First lens holder support member 31 ... Vertical axis 32 ... Second lens holder support member 33 ... Fixed support base 34, 35, 36 ... Fixing screw 37, 38 ... Position Adjustment screw 40 ... Optical axis adjustment tool for imaging device 41 ... Lens holder 42, 43 ... Horizontal Shaft 44 ... first lens holder support member 45 ... vertical shaft 46 ... second lens holder support member 47 ... fixed support base 48, 49, 50 ... fixing screw 51,52 ... position adjusting screw

Claims (3)

Illumination light is projected from the illumination device arranged on the front side or rear side of the hole mold to the hole mold of the steel bar manufacturing mill, and the illumination light that has passed through the hole mold is transmitted to the rear side or front side of the hole mold. A roll misalignment inspection method for a steel bar manufacturing rolling mill that receives light from an image pickup device disposed in the image sensor, converts the image signal into an image signal, and processes the image signal to inspect the misalignment of a rolling roll that forms the hole mold. And
A target plate attached to the other of the imaging device or the illumination device is irradiated with laser light from at least three laser pointers attached to one of the illumination device or the imaging device to face the laser pointer, and the target Rolling for manufacturing a steel bar characterized by inspecting misalignment of the rolling roll after aligning the optical axis of the illuminating device and the optical axis of the imaging device based on the irradiation position of the laser beam irradiated on the plate Roll center misalignment inspection method.   The laser pointer has an optical axis of the laser pointer parallel to the optical axis of the illuminating device or the imaging device on which the laser pointer is mounted, and on the same circumference around the optical axis of the illuminating device or the imaging device. 2. The roll misalignment inspection method for a rolling mill for manufacturing a steel bar according to claim 1, wherein the target plate is irradiated with laser light at equal intervals.   When the optical axis of the illuminating device and the optical axis of the imaging device are on the same straight line, a plurality of reference irradiation position marks indicating a reference irradiation position of laser light emitted from the laser pointer to the target plate are displayed on the target plate And adjusting the position of the illuminating device and / or the imaging device so that the irradiation position of the laser beam on the target plate matches the reference irradiation position mark, so that the optical axis of the illuminating device is adjusted. A roll misalignment inspection method for a rolling mill for manufacturing steel bars according to claim 1 or 2, wherein the optical axis of the imaging device is aligned with the optical axis of the imaging device.

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