JPH06142720A - Centering device for bar steadyer - Google Patents

Abstract

PURPOSE:To simultaneously measure not only the roll center of bar steadyer but the parallelism to the mill center. CONSTITUTION:This device consists of a laser beam emitting device irradiating in the opposite direction with laser beam which is provided on one of an inlet side or an outlet side of the bar steadyer 3 of a perforating mill, a diffusion plate 19 which can turn round the axis of a dummy tube 19 supported by three rolls of the bar steadyer and is arranged movably in parallel with the axial direction of the dummy tube 18 and a beam receiving device made of a CCD camera 22. Further, it contains an arithmetic display device which requires the difference between the axis of the dummy tube 18 and the laser beam obtained based on a beam received result of the beam receiving device and which calculates the parallelism between the pass center of the mill and the axis of the bar steadyer. In this way, the axis of the bar steadyer can be measured with high accuracy and in a short time and dimensional fault such a thickness deviation of a product generated by deviated alignment can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Burstedia centering device which is a supporting device for a mandrel bar that supports a plug on the exit side of a piercing and rolling machine (piercer) for seamless pipe manufacturing by the Mannesmann system.

[0002]

2. Description of the Related Art In the manufacture of a seamless tube by the Mannesmann method, a blank tube is guided by a burst teddy device at a rear table during piercing, and when piercing is completed, it is pulled out of a piercing and rolling machine by a dragout roller. Burstedia is a support device for suppressing whirling of the mandrel bar during perforation, and when three rolls are opened and closed by a link mechanism and guide the raw pipe, it opens to a position slightly larger than the raw pipe diameter. In the above piercing and rolling, if the plug is eccentric with respect to the core of the mill, eccentricity eccentricity occurs in which the wall thickness after piercing becomes uneven. Therefore, centering of burstedia is performed about once every three months so that the core of burstedia matches the core of the mill.

[0003] Conventionally, the centering of Burstedia is shown in FIG.
As shown in FIG. 9, the piano wire 71 is stretched in the same plane as the mill core of the piercing and rolling machine 72 in the horizontal projection plane, and the weight 73 is hung from the piano wire 71. On the other hand, the Bursteadia 74 holds a dummy bar 75 of a length that can be held by only one Bursteadia 74, and measures the misalignment in the horizontal plane from the deviation between the line 76 hanging the weight 73 and the center of the dummy bar 75. To do. As for the height direction, as shown in FIG. 10, a deviation from the reference height is set on the dummy bar 75 with a ruler 77.
It was measured by reading the scale of the intersection of the ruler 77 and the reference height with a level meter 78 such as a transit standing upside down. The above-mentioned centering measurement of Burstedia not only required about 8 hours by three persons, but the centering accuracy was limited to about ± 1 mm.

Further, as a centering device in which a laser beam irradiating section and a laser beam receiving apparatus are combined, the laser irradiating section is located close to the entrance side of the first stand, and the laser irradiation section is located close to the exit side of the final stand. A beam detector for receiving a beam emitted from the irradiation unit is provided, and a jig having a central portion coinciding with the center of the space is detachably attached to a substantially circular space formed by the caliber of each pair of rolls. A method of emitting a laser beam from the laser irradiation unit perpendicularly to the side wall of the first stand, and axially correcting each pair of rolls so that the center of each jig coincides with the center of the laser beam (Japanese Patent Publication No. 60- No. 7563), which includes a template through which a laser beam passes and which can be mounted on a rolling roll, wherein the axis of the hole is aligned with the axis of the path formed by the roll. And a device for determining the offset of the laser beam with respect to the axis of the path, the template comprising a tube and further comprising two elements made of elastic material in a frusto-conical or pyramidal shape, said element comprising: An apparatus (Japanese Patent Laid-Open No. 64-5614) attached to the pipe so that the small-area ends thereof can face each other so as to be movable in the axial direction along the pipe, having a reference target in the center, and a mandrel mill. Device comprising an hourglass-shaped jig roll sandwiched between the rolling rolls of each stand and an optical reader for measuring the center position of the reference target (Japanese Utility Model Laid-Open No. 3-68901), multi-stage steel pipe rolling machine A light source for irradiating a parallel light beam from the inlet side to the outlet side of the steel pipe transporting direction of the rolling roll, and a light receiver for receiving the parallel light source on the outlet side of the rolling roll in the steel pipe transporting direction, Proposal of the device (real Hei 4-33401 JP) or the like and an operation and display device for displaying seeking centering position by the position of the rolling rolls obtained based on a photodetection result of the light unit is performed.

[0005]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 60-75
The techniques disclosed in Japanese Patent Laid-Open No. 63-63, JP-A-64-5614, and Japanese Utility Model Laid-Open No. 3-68901 each insert a jig between rolls, and the center of the jig in contact with the rolls. And the roll axis center is measured from the positional relationship of the passing laser beam, and the roll core is captured at a point, and the parallelism with respect to the mill core cannot be measured.

It is an object of the present invention to provide a burstedia centering device capable of simultaneously measuring not only the roll core of the burstedia but also the parallelism with the mill core.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted various tests and examinations in order to achieve the above object. As a result, the laser emitting device was installed on either the entrance side or the exit side of the burst eddy, and the dummy tube in which the light receiving device such as a CCD camera was rotatably installed around the axis of the dummy tube was rolled. The laser beam draws a circular locus around the axis of the dummy tube when it is held at the position and the light receiving device is rotated, so that the relative position of the laser beam and the axis of the dummy tube can be measured. Also, by moving the light-receiving surface in the axial direction of the dummy tube, the angle of incidence between the axis of the dummy tube and the horizontal and vertical planes of the laser beam can be measured, and the angular deviation between the burstedia core and the path core in the horizontal plane can be measured. The present invention has been reached by the conclusion that the parallel deviation amount, the angular deviation amount in the vertical plane, and the parallel deviation amount can be calculated.

That is, according to the present invention, a laser emitting device for irradiating a laser beam toward the opposite side provided on either the inlet side or the outlet side of the burst steadier of a piercing and rolling mill, and three rolls of the burst steadier are held. A light receiving device for receiving the laser beam, which is arranged in the dummy tube so as to be rotatable about its axis and movable parallel to the axial direction of the dummy tube, and a dummy tube obtained based on the light receiving result of the light receiving apparatus. And a laser beam, and calculates the parallelism between the axis of the dummy tube and the axis of the burst tube.

[0009]

According to the present invention, a laser emitting device for irradiating a laser beam in the opposite direction is provided on either the entrance side or the exit side of the burst steadier of the piercing and rolling mill, and is held by three rolls of the burst steadia. Since the light receiving device for receiving the laser beam is arranged in the dummy tube having the same diameter as the mandrel bar so as to be rotatable about its axis and movable parallel to the axis of the dummy tube, By measuring the deviation of the laser beam from the path core,
It is possible to measure the deviation amount of Burstedia from the reference position.

The laser light emitting device according to the present invention is installed on the inlet side or the outlet side of the mill so as to be substantially coincident with the core of the mill so as to serve as a reference for the core of the mill. Further, the laser emitting device can be moved in the X-axis (horizontal) and Y-axis (vertical) directions, and can be rotated around each of the X-axis and Y-axis, so that it is almost aligned with the mill core. The irradiation direction is adjustable. Since it is difficult to make the laser beam and the mill core completely coincide with each other, if the laser emitting device is on the mill entrance side, the laser beam receiving device whose relative position to the mill core is known in advance is the exit side. Installed in the Z axis and measuring the error between the laser beam and the mill core, the Z axis (pass direction)
The error between the mill core and the laser beam at an arbitrary position can be determined.

For example, as shown in FIG. 4, the error amount between the mill core 60 and the laser beam 61 at the arbitrary position α in the Z direction is
As shown in FIG. 4, the following calculation can be performed using the light receiving devices 63 and 64 whose relative positions to the mill core 60 are known in advance. The error value (Xα, Yα) is Xα = (X ₂ −X ₁ ) / (L ₂ −L ₁ ) × (α−L ₁ ) + X ₁ Yα = (Y ₂ −Y ₁ ) / (L ₂ −L ₁ ) x (α-L ₁ ) + Y ₁

The laser beam receiving device according to the present invention is installed in a dummy tube having the same diameter as the mandrel bar held by Burstedia and having a length held by only one Burstedia roller. Hold. Therefore, by measuring the deviation between the axis center of the dummy tube and the path center, it is possible to measure the deviation amount of Burstedia from the reference position. The light receiving device for receiving the laser beam is a diffusion plate and a semiconductor position detecting device (P
position Sensitive Device
(Hereinafter referred to as PSD) or CCD camera. The laser beam hits the diffusion plate and forms a spot by the laser beam on the diffusion plate. This spot is
This device has a circular shape of about several mm, but PSD or C
The center coordinates of the spot can be obtained from the image captured by the CD camera using an image processing device.

It is generally difficult to match the coordinates of the laser beam receiving device and the dummy tube axial center with respect to the measurement of the deviation between the dummy tube axial center in which the laser beam receiving device is installed and the path core. Therefore, in the present invention, PSD or CC
The D camera is provided rotatably around the axis of the dummy tube, and the rotation angle is measured by an angle detector. In this case, as shown in FIG. 5, the center coordinates of the spot 65 of the laser beam is PS
When the D or CCD camera is rotated, the locus 66 draws a circle, and the center coordinates of the circle become the axis 67 of the light receiving device. Therefore, the respective positions are determined from the coordinates of the axis 67 of the light receiving device and the coordinates of the laser beam spot 65 at 0 °.

Further, the diffusion plate is provided with a slide device so as to be movable in the axial direction of the light receiving device, and as shown in FIG. 6, at the two points separated by a certain known amount L, the axis as described above is provided. The positional relationship between the core 67 and the spot center of the laser beam 61 is obtained. For example, let the incident side be the XY plane of Z = Z ₁ and the outgoing side be the XY plane of Z = Z ₂ (where X is the horizontal axis and Y is the vertical axis), and the distance therebetween is L. At that time, the axis of the light receiving device is set as the origin of the XY plane, and the coordinates of the laser beam are obtained. Further, the laser beam and pass the core coordinates by the methods described in the previous section (X _1, Y _1), pass the core coordinates (X ₂ at Z = Z _2, Y
₂ ), the XZ plane and the XY plane are as shown in FIG. Therefore, the angle deviation θ in the horizontal plane of the light receiving device axis 67, that is, the burst core and the path core, the parallel deviation L, the angle deviation ψ in the vertical plane, and the parallel deviation L become clear. Since the burst teddy device manages the movement adjustment amount for each roll in the horizontal plane and the vertical plane, the movement adjustment amount for each roll of the burst teddy device becomes clear from these values.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. 1 is a plan view showing the installation position of the laser emitting device, FIG. 2 is a cutaway perspective view of a dummy tube having a built-in CCD camera, FIG. 3 shows a mounting state of the laser emitting device, and FIG. The figure and (b) figure are side views. 1 to 3, reference numeral 1 is a roll of a piercing and rolling mill, 2 is a speed reducer for driving the roll 1 via a spindle 3, and is connected to an electric motor (not shown).
Reference numeral 4 indicates a burstedia provided on the delivery side table of the roll 1, and there are a plurality of burstedia in which three rolls are opened and closed by a link mechanism. 1-No. Up to 8 are provided.

5 is an output of 1 mW installed at the center of the speed reducer 2.
The He-Ne laser light emitting device 6 is a mount of the laser light emitting device 5 fixed to the speed reducer 2 and fitted in the convex portions of the guide 7 having the convex portions at both front ends, and the upper and lower adjusting bolts 8 and 9 are adjusted. You can move it vertically. Further, a horizontal guide 10 is provided on the mounting base 6 in a direction orthogonal to the path core, and a horizontal frame 12 having a circular groove 11 on an upper portion thereof is inserted into the guide 10 and the circular groove 11 of the horizontal frame is The rotary table 13 is rotatably inserted, and the laser light emitting device 5 that matches the path core is attached to the upper part of the rotary table 13. The horizontal frame 12 can be horizontally moved in the direction orthogonal to the mill core by adjusting the adjusting bolts 14 and 15.
3 can be rotated by adjusting the adjusting bolts 16 and 17, and the laser emitting device 5 is installed so that it can be tilted ± 5 ° vertically and horizontally, so that the axis of the laser beam matches the mill core. Has been adjusted.

Reference numeral 18 denotes a dummy tube in which a light receiving device is installed, which has the same cylindrical outer diameter as the mandrel bar and has a length that can be held by only one burstedia 4 and is moved in the axial direction of the dummy tube 18 inside. A free diffusion plate 19 and a CCD camera 22 which is held by a bearing 21 by a rotation driving device 20 and rotates are installed, and the rotation angle of the CCD camera 22 is detected by a rotation angle detector 23. The dummy tube 18 is held by the burst radia 4 during the measurement. The laser beam emitted from the laser emitting device 5 hits the diffusion plate 19 and forms a spot on the diffusion plate 19. This spot has a circular shape of about several mm, but the CCD camera 22
The center image of the image captured in step (3) is calculated using an image processing device (not shown), and is input and stored in the arithmetic display device.

With the above-described structure, when measuring the deviation between the core of the Burstedia 4 and the mill core, N
o. The roll of 1 Burstedia 4 holds the dummy tube 18, and a laser beam is emitted from the laser emitting device 5 toward the exit side of the Burstedia 4. Then, the spot of the laser beam reflected on the diffuser plate 19 in the dummy tube 18 is photographed by the CCD camera 22, the center of the spot of the laser beam is read by image processing, data is output as XY coordinate values, and stored in an arithmetic display device not shown. Let Then CC
The D camera 22 is rotated 180 ° while the angle is detected by the rotation angle detector 23, the center of the spot of the laser beam is similarly read by image processing, and the midpoint of the XY coordinate values of the stored data is the axis of the dummy tube 18. Becomes Further, if a circle is drawn on the locus of the central coordinates of the spot of the laser beam and the central coordinates of the circle are set as the axis of the dummy tube 18, the accuracy will increase accordingly. Therefore, the respective positions are determined from the coordinates of the axis of the light receiving device and the coordinates of the spot when the rotation angle of the laser beam is 0 °.

Further, the positional relationship between the shaft center and the spot center of the laser beam is obtained at two points separated from the diffuser plate 19 by a certain known distance L. That is, as shown in FIG. 6, the incident side of the laser beam is the XY plane of Z = Z ₁ and the outgoing side is Z = Z ₂
XY plane (where X is the horizontal axis and Y is the vertical axis), and the core of the light receiving device at that time is the origin of the XY plane, and the coordinates of the laser beam are obtained. Further, the laser beam and the path core are corrected to obtain the coordinates of the path core. The path center coordinates at Z = Z ₁ are (X ₁ , Y ₁ ), and the path center coordinates at Z = Z ₂ are (X ₂ ,
Y ₂ ), the XZ plane and the XY plane are as shown in FIG. 7. Therefore, the light receiving device core, that is, No. The amount of angular deviation θ and parallel deviation L in the horizontal plane of the four cores of 1 burstedia and the path core, and the amount of angular deviation ψ and parallel deviation L in the vertical plane become clear. These operations are No. If sequentially repeated from 1 to N0.8 Burstedia 4, it is possible to obtain the amount of angular deviation and parallel deviation in the horizontal plane of each Burstedia 4 core and the path core, and the amount of angular deviation and parallel deviation in the vertical plane. . Burstedia 4 manages the movement adjustment amount in the horizontal plane and in the vertical plane. Therefore, the movement amount of each burstedia 4 is adjusted based on these values so that each burstedia 4 core matches the path core. Can be adjusted.

[0020]

As described above, according to the present invention,
Burstedia's core measurement, which normally took 8 hours for 3 people, can be performed by one person in 2 to 3 hours, and the accuracy of core measurement has improved from ± 1mm of the conventional model to ± 0.1mm. It is possible to reduce dimensional defects such as uneven thickness of products caused by misalignment.

[Brief description of drawings]

FIG. 1 is a plan view showing an installation position of a laser emitting device.

FIG. 2 is a cutaway perspective view of a dummy tube having a built-in CCD camera.

FIG. 3 shows a mounting state of a laser emitting device,
FIG. 3A is a plan view and FIG. 1B is a side view.

4A and 4B are explanatory diagrams of calculation of an error amount at an arbitrary position between a mill core and a laser beam. FIG. 4A shows a horizontal (X axis) direction, and FIG. 4B shows a vertical (Y axis) direction.

FIG. 5 is an explanatory diagram showing a locus of a spot of a laser beam when a CCD camera is rotated.

FIG. 6 is an explanatory diagram of a positional relationship between an axial center and a spot center of a laser beam when a diffusion plate is slid for a certain distance.

FIG. 7 is an explanatory diagram of an angular deviation amount and a parallel deviation amount between a shaft core and a path core of a laser beam when the diffusion plate is slid a predetermined distance. FIG. 7A is a horizontal (X axis) direction, and FIG. ) The figure shows the vertical (Y-axis) direction.

FIG. 8 is an explanatory diagram of a Burstedia core measurement using a conventional piano wire.

FIG. 9 is an explanatory diagram of a horizontal shift measurement of a Burstedia core by using a conventional piano wire.

FIG. 10 is an explanatory diagram for measuring a vertical deviation of a Burstedia core by using a conventional piano wire.

[Explanation of symbols]

 1 Roll 2 Reduction Gear 3 Spindle 4, 74 Burstedia 5 Laser Emitting Device 6 Mounting Base 7 Guide 8, 9, 14, 15, 16, 17 Adjusting Bolt 10 Guide 11 Circular Groove 12 Horizontal Frame 13 Rotating Base 18 Dummy Tube 19 Diffusing Plate 20 Rotational drive device 21 Bearing 22 CCD camera 23 Rotation angle detector 60 Mill core 61 Laser beam 63, 64 Light receiving device 65 Spot 66 Locus 67 Axis core 71 Piano wire 72 Perforating and rolling mill 73 Weight 75 Dummy bar 76 Line 77 Ruler 78 Level Meter

Claims (1)

[Claims] 1. A laser emitting device for irradiating a laser beam toward the opposite side provided on either the inlet side or the outlet side of the burst eddy of a piercing and rolling mill, and a dummy tube held by three rolls of the burst eddy A light-receiving device that is rotatable around its axis and is movable in the axial direction of the dummy tube, and a dummy tube axis and a laser obtained based on the light-receiving result of the light-receiving device. A Burstedia centering device that consists of a calculation display device that calculates the difference between the beam and the axis of the dummy tube while calculating the difference between the beam and the axis.