JPH06142719A - Centering measuring instrument for piercing mill - Google Patents

Abstract

PURPOSE:To make it possible to measure at which position a roll shaft center is to a mill center as reference. CONSTITUTION:In a centering measuring instrument of a piercing mill to measure the position to the mill center of the roll 1 of the piercing mill, a three dimensional measuring instrument 6 consisting of a laser beam emitting device 5 agreeing nearly to the mill center provided on the inlet side or the outlet side of the piercing mill, a sensor head to receive laser beam, a non-contact displacement gage which can measure a roll gap in non-contact and a linear encoder to measure a moving amount of the non-contact displacement gage moving in the mill center direction and in the vertical direction is provided. Further, this device contains an arithmetic display device to operate and display a deviation between the mill center and the roll center in the horizontal direction, an angular deviation of a crossed axes angle and a deviation between a mill center and a roll center in the vertical direction and an angular deviation of an inclined angle in accordance with the central coordinate of laser beam measured by a three dimensional measuring instrument, a distance as far as the roll measured by the non-contact displacement gage and a moving amount in the mill center direction and the vertical direction of the non-contact displacement gage measured by a linear encoder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering measuring device for measuring and determining the position of a roll of a piercing and rolling machine with respect to a mill core in the Mannesmann tube manufacturing method by means of a cross section of a main roll.

[0002]

2. Description of the Related Art As shown in FIG. 12 (a), a piercing / rolling machine in the Mannesmann pipe manufacturing method uses roll shaft cores 51, 5 as shown in FIG.
2 are inclined in opposite directions to each other in the vertical plane with respect to the mill core Oa at a predetermined angle (θ), and as shown in FIG. is doing. The roll interval and the crossing angle α are adjusted by driving the roll chock 54 supported in the cradle 53 with the roll opening / closing adjusting screw 55. The inclination angle θ is adjusted by rotating the cradle 53 from below. Conventionally, the positional relationship between the mill core Oa in the horizontal plane and the roll shaft cores 51 and 52 is measured by measuring the distance (L _{a to} L _d ) from the tip of the roll opening / closing adjusting screw 55 to the mill core Oa. The distances to the surfaces of the rolls 56 and 57 have been measured and adjusted under the assumption that they are as shown in the drawing. In the vertical plane, the distance (L _e ) between the apex of the cradle 53 and the mill core Oa was measured using an optical level meter, and similarly adjusted by comparing with the drawing size.

Therefore, the position of the roll relative to the core of the mill can be measured only indirectly, and the position of the actual contact of the material to be punched with the plug is actually determined. I can't confirm. For this reason, in the above-mentioned conventional method, even if there is an eccentricity due to the eccentricity due to the displacement of the relative position between the roll and the plug, the necessary correction amount cannot be measured, and there is only a method to indirectly calculate. . The adjustment of the roll axis in such a piercing and rolling machine is usually carried out every three months, and the required centering accuracy is about ± 1 mm.

As a centering method in the rolling mill,
A laser irradiator is provided near the entrance side of the first stand, and a beam detector is provided near the exit side of the final stand to receive the emitted beam of the laser irradiator. A jig having a central portion that coincides with the center of the space is detachably attached to the substantially circular space, and a laser beam is emitted from the laser irradiation unit perpendicularly to the side wall of the first stand, and the center of each jig A method of axially correcting each pair of rolls so that the portion coincides with the center of the laser beam (Japanese Patent Publication No. 60-7563).
An apparatus having a hole through which a laser beam passes and including a template mountable to a rolling roll, wherein the axis of the hole coincides with the axis of a path formed by the roll, and the deviation of the laser beam with respect to the axis of the path is determined. The template comprises a tube and further comprises two elements made of elastic material in a frusto-conical or pyramidal shape, said elements having their small area ends facing each other and an axis along said tube. A device (Japanese Patent Laid-Open No. 64-5614) attached to the tube so as to be movable in a direction, having a reference target in the center, and having a drum shape sandwiched between rolling rolls of each stand of the mandrel mill. A device comprising a jig roll and an optical reading device for measuring the center position of the reference target (Japanese Utility Model Laid-Open No. 3-68901), a rolling roll of a multi-stage steel pipe rolling machine. A light source for irradiating parallel light rays from the entrance side to the exit side of the steel pipe transport direction, a light receiver for receiving the parallel light source on the exit side of the rolling roll in the steel pipe transport direction, and a light receiving result of the light receiver. There has been proposed a device (Japanese Utility Model Laid-Open No. 4-33401) provided with a calculation display device for obtaining and displaying a centering position based on the position of the rolling roll.

[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 jig is placed in contact with the center of the jig. The roll axis center is measured from the positional relationship of the passing laser beam. However, in the piercing and rolling mill, the roll axes intersect at a predetermined angle in the horizontal plane and are inclined in opposite directions in the vertical plane. Moreover, in the piercing and rolling mill, cone-type or barrel-type rolls are used, and it is extremely difficult to accurately pinch the jig between the rolls, and it is impossible to secure the centering accuracy. Further, the device disclosed in Japanese Utility Model Laid-Open No. 4-33401 measures the core between the rolls by projecting the rolls and can only determine the positional relationship of the most convex portions of the rolls.
It is not possible to measure the roll axis tilt of a piercing and rolling mill.

An object of the present invention is to measure in three dimensions the roll shape of a piercing and rolling mill in which the roll axes intersect and incline with each other, so that the position of the roll axis relative to the mill core can be determined. An object is to provide a centering measurement device that can perform measurement.

[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, a laser light emitting device serving as a mill core is installed at the entrance side or the exit side of the piercing and rolling mill, and the laser light receiving device and the non-contact displacement meter are provided between the rolls.
By arranging a three-dimensional measuring device consisting of a linear encoder of the direction, and by measuring the roll shape in three dimensions, it is concluded that the position of the roll axis relative to the mill core can be calculated. This invention was reached.

That is, the present invention is a centering measuring device for a piercing / rolling machine for measuring the position of a roll of the piercing / rolling machine with respect to the mill core, and is substantially the same as the mill core installed on the inlet side or the outlet side of the piercing and rolling mill. Laser emitting device, sensor head for receiving laser beam installed between rolls of piercing and rolling mill, non-contact displacement meter that can measure the distance between rolls in a non-contact manner, non-contact displacement meter that moves in the mill core direction and vertical direction A three-dimensional measuring device consisting of a linear encoder for measuring the amount of movement of the laser beam, the center coordinates of the laser beam measured by the three-dimensional measuring device, the distance to the roll measured by the non-contact displacement meter, the non-linearity measured by the linear encoder. Based on the amount of movement of the contact displacement meter in the mill core direction and the vertical direction, the amount of misalignment between the horizontal mill core and roll and the angular deviation of the crossing angle, and the vertical direction between the mill core and the roll. It becomes the angle deviation amount of the misalignment amount and the inclination angle from the operation and display device for calculation display.

[0009]

According to the present invention, a laser light emitting device is installed on the inlet side or the outlet side of the piercing and rolling machine so as to substantially coincide with the mill core, and the sensor head for receiving the laser beam between the rolls of the piercing and rolling machine and the distance from the rolls. Since the non-contact displacement meter that can measure the non-contact, and the linear encoder that measures the movement amount of the non-contact displacement meter that moves in the mill core direction and the vertical direction are installed, the core of the three-dimensional measurement device is installed. By measuring the deviation between the path core of the laser beam and the path core of the laser beam, the deviation amount of the core of the three-dimensional measuring device with respect to the path core of the laser beam can be measured.

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, in the laser emitting device, if the Z axis is in the same direction as the mill core, the X axis is the horizontal direction perpendicular to the mill core, and the Y axis is the vertical direction perpendicular to the mill core,
It is movable in the directions of the axis and the Y-axis, and is rotatable around the axes of the X-axis and the Y-axis. However, it is difficult to match the laser beam and the mill core. Therefore, if the laser emitting device is on the mill entrance side, the laser beam receiver whose relative position to the mill core is known in advance is the exit side. It is possible to determine the error between the mill core and the laser beam at an arbitrary position on the Z axis (pass direction) by installing the laser beam at the position and measuring the error between the laser beam and the mill core.

For example, as shown in FIG. 11, the Z direction is arbitrary.
Error amount between mill core Oa and laser beam Lb at position α
Is set in advance as shown in Figs. 11 (a) and 11 (b).
The light receiving device 4 whose relative position to the light emitting device 41 is known.
Using 2, 43, the following calculation can be performed. Error value (X
α, Yα) is Xα = (X₂-X₁) / (L₂-L₁) × (α-L₁) + X₁  Yα = (Y₂-Y₁) / (L₂-L₁) × (α-L₁) + Y₁

The three-dimensional measuring apparatus according to the present invention measures the cross section of the piercing rolls and the positional relationship with the mill core. Normally, the three-dimensional measuring device is installed on the pedestal on which the lower guide shoe between the piercing rolls is installed. If the coordinates of the original measuring device are X ′ axis, Y ′ axis, and Z ′ axis, the coordinate X of the mill core is
The axes are attached so that the X-axis, the Y-axis, and the Z-axis and the X′-axis, the Y′-axis, and the Z′-axis substantially coincide with each other. However, the three-dimensional measuring device
In order to fix the rotation around the Z'axis, a spirit level is attached and arranged in the X'axis direction so that the X'axis direction is horizontal. Then, the non-contact displacement gauge is scanned in the Y′-axis direction at a plurality of positions in the Z′-axis direction of the roll to obtain a continuous roll sectional curve. Therefore, the non-contact displacement gauge that measures the distance to the roll surface in the X′-axis direction is slidable in the Y′-axis direction and the Z′-axis direction, and the moved distance is measured by the linear encoder. The light receiving device that receives the laser beam that serves as a reference for the mill core is a diffuser plate and a CCD camera or a semiconductor position detecting device (Position Sensi).
(hereinafter referred to as PSD). The laser beam hits the diffuser plate and forms a spot by the laser beam on the diffuser plate when the diffuser plate and the CCD camera are used, and forms a spot by the laser beam on the light receiving surface of the PSD when the PSD is used. This spot has a circular shape of about several millimeters in this device, but the CCD
The center coordinates of the laser spot can be obtained from the image captured by the camera or PSD using an image processing device.

The calculation display device calculates the position of the mill core from the roll cross sections at a plurality of positions measured by the non-contact displacement meter and the coordinates of the laser beam at each cross section position. However, X'-
The coordinate origin of the Y ′ plane is used as the core of the three-dimensional measuring device, and the coordinates of the mill core are obtained. At this time, draw a perpendicular on the roll cross section and find the coordinates of the contact point with the roll tip. Next, the arithmetic display device
The axis deviation between the core of the three-dimensional measuring device and the mill core is corrected. The correction of the axis deviation between the core of the three-dimensional measuring device and the mill core is performed by X'-
From the Z ′ plane projection view and the Y′-Z ′ plane projection view, the origin of Z ′ is set at the reference point when the three-dimensional measuring device is installed. Then, the coordinates (X ′, Y ′, Z ′) of each point are corrected to the coordinate system (X, Y, Z) of the mill core. X from the corrected coordinates
-Draw a Z-plane projection view and a YZ-plane projection view, draw a straight line that passes through each point in the X-Z projection plane, and draw it. Mill core Oa
By comparing with, the X axis of the roll, that is, the horizontal misalignment amount and the crossing angle misalignment amount are displayed, and the roll chock is adjusted by the roll opening / closing adjusting screw to perform the centering. In the YZ projection plane, a straight line that passes through each point is drawn and compared with the mill core to display the vertical misalignment amount of the roll and the deviation amount of the inclination angle. By adjusting the liner, etc. Perform centering.

[0014]

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 the three-dimensional measuring device, FIG. 3 shows a mounting state of the three-dimensional measuring device, and FIG. (B) The figure is a side view, FIG.
5 is an enlarged side view of a mounting portion of the three-dimensional measuring device, and FIG. 5 is a conceptual diagram showing a connection state between the three-dimensional measuring device and the arithmetic display device. 1 to 5, 1 is a roll of a piercing and rolling mill,
A speed reducer 2 drives the roll 1 via a spindle 3 and is connected to an electric motor (not shown). 4 is roll 1
With the burst steadier provided on the delivery side table, there are multiple burst steadies that three rolls open and close with a link mechanism.
For example, No. 1-No. Up to 8 are provided. Reference numeral 5 denotes a He-Ne laser light emitting device having an output of 1 mW installed at the center of the speed reducer 2, and is fixed by adjusting the angles in the X-axis direction and the Y-axis direction so that the laser spot center substantially coincides with the mill core Oa. . Reference numeral 6 denotes a three-dimensional measuring device installed between the rolls 1 and 1, which is arranged horizontally on a lower mount 7 from which a lower guide shoe is removed by a horizontal level 8 in the X-axis direction. The three-dimensional measuring device 6 uses a laser beam diffusing plate 9 and a CCD camera 10 as a light receiving device. The diffusing plate 9 is installed so as to be in the same XY plane as the measuring part of the non-contact displacement meter 11, the trajectory of the laser beam is photographed by the CCD camera 10, and the center of the laser spot is read as coordinate values. The coordinate values are read and stored in the calculation display device 13 via the device 12. CCD camera 1 of the three-dimensional measuring device 6
0 is rotatably installed in the tube 14 so that it can rotate around the reference axis of the three-dimensional measuring device 6, and the CCD camera 10
The rotation angle of is detected by the angle detector 15 and input to the calculation display device 13.

Further, the non-contact displacement gauge 1 of the three-dimensional measuring device 6
1 is slidable in the Z′-axis direction parallel to the reference axis of the three-dimensional measuring device 6 and in the Y′-axis direction perpendicular to the reference axis, and moves relative to the reference position in the Z′-axis direction and the Y′-axis direction. The distance is measured by each of the linear encoders 16 and 17, and is input to the calculation display device 13. Further, the non-contact displacement meter 11 is configured to measure the distance between the reference axis of the three-dimensional measuring device 6 and the surface of the roll 1 or 1 in the horizontal X′-axis direction, and input it to the calculation display device 13. Therefore, it is possible to measure the distance from the reference axis at an arbitrary position on the surface of the rolls 1 and 1 in the Y ′ axis direction. The calculation display device 13 includes the coordinate value of the laser spot input from the coordinate reading device 12, the reference axis of the three-dimensional measuring device 6 at the plural positions in the Z′-axis direction input from the non-contact displacement meter 11, and the roll 1. 1 surface distance and Z'axis direction input from the linear encoders 16 and 17,
The X'-Z 'projection surface and the Y'-Z' projection surface of the rolls 1 and 1 are obtained based on the moving distance with respect to the reference position in the Y'-axis direction, and compared with the mill core, the X-axis directions of the rolls 1 and 1 are compared. While calculating and displaying the misalignment amount of the
It is configured to calculate and display the amount of misalignment of the rolls 1 and 1 in the Y-axis direction and the amount of angular misalignment of the tilt angle.

With the above configuration, when measuring the deviation between the cores of the rolls 1 and 1 and the mill core Oa, three-dimensional measurement is performed on the lower mount 7 from which the lower guide shoes between the rolls 1 and 1 are removed. The device 6 is installed and a laser beam is emitted from the laser emitting device 5 toward the exit side of the piercing and rolling mill. Then, the laser spot imaged on the diffusion plate 9 of the three-dimensional measuring device 6 is photographed by the CCD camera 10, the central position of the laser spot is read by the coordinate reading device 12, and is stored in the calculation display device 13. Then, the CCD camera 10 is rotated while the angle is detected by the angle detector 15. Then, as shown in FIG. 6, the coordinate position of the laser spot draws a circle around the axis of the three-dimensional measuring device 6, that is, the Z ′ axis.
By reading the coordinates of the Z ′ axis, the positional relationship between the laser spot and the Z ′ axis becomes clear. Therefore, since the Z coordinate is made clear in advance, the positional relationship between the mill core and the Z ′ axis can be calculated from the relationship between the laser spot and the mill core.

Rolls 1 and 1 of the piercing and rolling mill are, as shown in FIG. 7, a cone type in which two cones are piled up, or a shape in which two cones are piled up.
The barrel type that the center swells like a beer barrel is used. The roll interval widens and narrows from the perforated material entry side to the position of the gorge 18 in the X-axis-Y-axis plane, and conversely widens from the gorge position toward the exit side. Therefore, on the entry side from the gorge 18, as shown in FIG. 7, AA, B-
2 cross section of B, C-C, DD on the output side from the gorge 18.
The non-contact displacement gauge 11 measures the total of 4 cross-sections, and the linear encoder measures the movement distances of the non-contact displacement gauge 11 from positions B to D in the Y'axis and Z'axis directions. Measurements are made at 16 and 17 and input to the calculation display device 13.

As shown in FIG. 8 (a), the calculation display device 13 calculates the position of the mill core Oa from the coordinates of the laser spot on the AA cross section, and the coordinate origin of the X'-Y 'plane is the tertiary. As the core O of the original measuring device 6, the coordinates of the mill core Oa are obtained.
A perpendicular is drawn on the roll cross section measured at this time, and the coordinates of the contact points a1 and a2 with the tip are obtained. Similarly, FIG.
As shown in the diagram (d), the arithmetic and display unit 13 displays Ob, b.
The respective coordinates of 1, b2, Oc, c1, c2, Od, d1 and d2 are obtained. Next, the calculation display device 13 corrects the misalignment between the three-dimensional measuring device 6 core O and the mill core Oa. The correction of the axis deviation between the three-dimensional measuring device core O and the mill core Oa is shown in FIG.
The X'-Z 'plane projection view shown in (a) figure and the Y'-Z' plane projection view shown in (b) figure are shown in a figure, and the origin of Z'is when the three-dimensional measuring device 6 is installed. It is set at the reference point P. Then, the coordinates (X ′, Y ′, Z ′) of each point are corrected to the new mill core coordinate system (X, Y, Z) by the following formula. X = cos θX ′ + sin θZ ′ + α Y = cos φY ′ + sin φZ ′ + β Z = −sin θX′−sin φY ′ + cos θ · cos
ψZ '

Next, the arithmetic and display unit 13 draws an XZ plane projection view and a YZ plane projection view from the corrected coordinates, and FIG.
A ₁ -b ₁ -c ₁ -d ₁ in the XZ projection plane shown in FIG.
Pull the straight line passing through a ₂ -b ₂ -c ₂ -d ₂ plotting. Then, by comparing with the mill core Oa, X of the rolls 1 and 1
The axis, that is, the horizontal misalignment amount and the angle misalignment amount of the crossing angle θ are displayed, and the roll chock is adjusted by the roll opening / closing adjusting screw to perform the centering. Further, in the Y-Z projection plane shown in FIG. 10 (b) Fig., A ₁ -
By drawing a straight line passing through b ₁ -c ₁ -d ₁ and a ₂ -b ₂ -c ₂ -d ₂ and comparing it with the mill core Oa, the misalignment amount of the rolls 1 and 1 in the Y axis, that is, the vertical direction, The deviation amount of the inclination angle ψ is displayed, and the liner is adjusted to perform centering.

[0020]

As described above, according to the apparatus of the present invention, the amount of misalignment in the horizontal direction with respect to the mill core of the roll of the piercing and rolling mill, the amount of angular misalignment of the crossing angle, the amount of misalignment in the vertical direction, and the inclination angle are set. The deviation amount can be accurately measured, and if the roll position is corrected based on this, the thickness accuracy of the product can be improved.

[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 the coordinate measuring apparatus.

FIG. 3 is a view showing a mounting state of the three-dimensional measuring device,
FIG. 3A is a plan view and FIG. 1B is a side view.

FIG. 4 is an enlarged side view of a mounting portion of the coordinate measuring apparatus.

FIG. 5 is a conceptual diagram showing a connection state between a three-dimensional measuring device and a calculation display device.

FIG. 6 is an explanatory diagram showing a locus of a spot of a laser beam when a CCD camera is rotated.

7A and 7B show measurement positions of distances between roll surfaces at a plurality of positions in the Z-axis direction. FIG. 7A is an X-axis direction, and FIG. 7B is an Y-axis direction.

8A and 8B are roll cross-sectional views based on measurement results of distances between roll surfaces at a plurality of positions in the Z-axis direction. FIG. 8A is a cross-sectional view taken along line AA, FIG. 8B is a cross-sectional view taken along line BB, and FIG. ) The figure shows C-C cross section,
(D) The figure shows a DD cross section.

FIG. 9 is an explanatory diagram for correcting the axis deviation between the core of the three-dimensional measuring device and the mill core, and FIG. 9A is an X′Z ′ plane projection diagram,
(B) The figure is a Y'Z 'plane projection view.

10A and 10B are projection views of a roll based on corrected coordinates, where FIG. 10A is a projection view on the XZ plane and FIG. 10B is a view on the YZ plane.
FIG.

FIG. 11 is an explanatory diagram of calculation of an error amount at an arbitrary position between the mill core and the laser beam, FIG. 11A is a horizontal (X axis) direction, and FIG.
The figure shows the vertical (Y-axis) direction.

FIG. 12 shows a roll arrangement of a piercing and rolling mill,
The figure (a) is a side view, and the figure (b) is a top view.

[Explanation of symbols]

 1 Roll 2 Spindle 3 Reducer 4 Burstedia 5, 41 Laser Light Emitting Device 6 Three-dimensional Measuring Device 7 Lower Frame 8 Level Level 9 Diffuser Plate 10 CCD Camera 11 Non-contact Displacement Meter 12 Coordinate Reading Device 13 Calculation Display Device 14 Tube 15 Angle Detector 16, 17 Linear encoder 42, 43 Light receiving device 51, 52 Roll shaft core 53 Cradle 54 Roll chock 55 Roll open / close adjusting screw Oa Mill core

Claims (1)

[Claims] 1. A centering measuring device of a piercing and rolling machine for measuring the position of a roll of the piercing and rolling machine with respect to a mill core, and a laser light emitting device which is substantially aligned with a mill core installed on an inlet side or an outlet side of the piercing and rolling machine. A three-dimensional structure comprising a sensor head for receiving the laser beam, a non-contact displacement meter capable of measuring the distance between the rolls in a non-contact manner, and a linear encoder measuring the movement amount of the non-contact displacement meter moving in the mill core direction and the vertical direction. Measuring device and center coordinates of laser beam measured by the three-dimensional measuring device, distance to roll measured by non-contact displacement meter, movement of non-contact displacement meter measured by linear encoder in mill core direction and vertical direction Based on the amount, the horizontal misalignment amount of the mill core and roll and the angular misalignment amount of the crossing angle, the vertical misalignment amount of the mill core and roll, and the angular misalignment amount of the tilt angle are calculated and displayed. A centering measuring device for a piercing and rolling mill, which comprises a calculation display device.