JP6717287B2 - Shape measuring device for welded part of welded pipe - Google Patents

Description

The present invention relates to a welded portion shape measuring apparatus for measuring a welded portion of a welded pipe such as a UOE steel pipe, and more particularly to a welded portion of a weld bead grinding portion at a pipe end portion of the welded pipe. , Relates to a fully automatic measuring device.

The UOE steel pipe, which is one of the welded pipes, is manufactured by bending a thick steel pipe by press working and welding the bent side end faces of the thick steel pipe by abutting against each other. At the welded part, a swelling called a bead occurs in the lengthwise direction of the UOE steel pipe on the outer peripheral surface or the inner peripheral surface of the UOE steel pipe, and after the welding operation or after welding when the UOE steel pipe is connected and used as in a line pipe or the like. Adversely affect the inspection work. For this reason, the weld bead at the pipe end portion of the UOE steel pipe is usually ground within a range of about 200 mm from the pipe end surface so as not to become thinner than the wall thickness of the base metal portion. The weld bead rising on the inner peripheral surface of the UOE steel pipe has its inner surface ground, and the weld bead rising on the outer peripheral surface of the UOE steel pipe has its outer surface ground. Since the shape and size of the welded part have a great influence on the quality of the UOE steel pipe, the shape and size of the ground weld bead (the welded part of the weld bead grinding part) include the outer circumference of the UOE steel pipe and the rising height of curvature. There are a peaking value represented, a bead height representing the height of the weld bead rising from the base metal, and an offset value represented by the difference between the base metal heights at the left and right ends of the weld bead in the width direction.

For measuring the shape and dimension of such a welded portion, conventionally, for example, a welded portion size measuring device disclosed in Patent Document 1 is used. The weld size measuring instrument shown in Patent Document 1 has a digital dial gauge which can be horizontally slid on the gantry base and which can be set to a zero point and which is vertically installed. It has an installed indicator needle and a scale indicating the moving distance of the dial gauge when the point at which the dial gauge is located at the center of the gantry is set to zero by the indicator needle.
When measuring the shape and dimensions of the various welds described above using the weld size measuring instrument disclosed in Patent Document 1, it is necessary to manually position the dial gauge for each measurement item. Is complicated, and it takes a long time for measurement, which is a major impediment to efficiency. Moreover, since the measurement is performed manually, there is a problem in that the measurement result varies.

In order to solve this problem, a method and apparatus for measuring the shape and size of a welded portion, which are disclosed in Patent Document 2, have been conventionally proposed. The method for measuring the shape and size of a welded part shown in Patent Document 2 is a method for measuring the shape and size of a welded part of a bead grinding part at the end of a welded steel pipe by a light cutting method using a measuring head composed of a two-dimensional laser distance meter. In addition, slide the measuring head to collect the shape data of the weld part of the bead non-grinding part, and similarly slide the measuring head to collect the shape data of the weld part of the bead grinding part, The positions of the left and right sill edges in the bead width direction are specified from the shape data of the welded part of the bead, and the position data of the squeezed edge of the bead non-ground part and the shape data of the welded part of the bead grinding part are used to identify the bead grinding part. The shape and dimensions of the welded part are determined.

Then, by this measuring method, for example, when measuring the shape and dimension of the welded portion on the outer surface side of the welded steel pipe, the welded steel pipe is stopped to rotate so that the welded portion is located above, and the measuring device (stand The measurement head is slidably attached to the measurement head and is set so that the measurement center position of the two-dimensional laser range finder of the measurement head is substantially located on the center line of the welded portion. Then, the measuring head is moved to collect the shape data of the welded portion of the bead grinding portion.
Thereby, the shape and size of the welded portion of the bead grinding portion at the end of the welded steel pipe can be measured efficiently and highly accurately.

Japanese Utility Model Publication No. 6-49918 JP 2001-201327 A

However, the conventional method for measuring the shape and size of the welded portion disclosed in Patent Document 2 has the following problems.
That is, when measuring the shape of the welded portion of the welded steel pipe, for example, when measuring the shape of the welded portion on the outer surface side of the welded steel pipe, it is necessary to manually set the measuring device on the welded steel pipe each time. However, it cannot be said that the measurement is performed automatically, and the workability is extremely poor for measuring the total number of welded steel pipes.
On the other hand, when performing such a measurement, as described above, the welded steel pipe is stopped so that the welded portion is located above, the measuring device is placed on the upper portion, and the measurement center position of the two-dimensional laser rangefinder of the measuring head is set. Must be set so that they are almost on the center line of the welded part, but if the turning and stopping of the welded steel pipe are performed using a turning roll for full automation of the measurement, the pipe circumferential direction of the welded part It is extremely difficult to stop at a certain position with high precision.

Therefore, the present invention has been made in order to solve this conventional problem, and its object is to obtain the shape and size of the welded portion of the weld bead grinding portion at the pipe end portion of the welded pipe in a fully automatic and highly accurate manner. It is an object of the present invention to provide a device for measuring the shape and size of a welded portion of a welded pipe, which can measure the above.

In order to solve the above problems, the apparatus for measuring the shape and dimension of a welded portion of a welded pipe according to an aspect of the present invention is attached to a measurement carriage movable in the pipe axis direction of the welded pipe to be measured so as to be movable up and down. A rotating mechanism having a rotating shaft rotatable about an axis substantially the same as the central axis of the measuring welded pipe, a measuring arm attached to the rotating shaft of the rotating mechanism and rotating together with the rotating shaft, and the measuring arm. On the other hand, the position of the outer peripheral surface and the inner peripheral surface of the pipe end portion including the weld bead grinding portion in which the weld bead of the measured weld pipe is ground is attached while being movably mounted in the radial direction of the measured weld pipe. Measuring head including a pair of first displacement gauges and a second displacement gauge for detecting at least one of the outer peripheral surface and the inner peripheral surface of the welded pipe to be measured including the weld bead non-ground portion where the weld bead is not ground. And a control unit for controlling the moving operation of the measuring carriage, the rotating operation of the rotating shaft of the rotating mechanism, the lifting operation of the rotating mechanism, and the radial moving operation of the measuring head, and the rotation angle of the rotating shaft of the rotating mechanism. A rotation angle detector for detecting, and a calculation unit for calculating the shape and size of the welded portion of the weld bead grinding portion at the pipe end of the measured welded pipe, the calculation unit is obtained from the rotation angle detector Based on the rotation angle data of the rotating shaft and the position data of the outer peripheral surface and the inner peripheral surface of the pipe end portion including the weld bead grinding portion of the measured welded pipe obtained from the pair of first displacement meters, A first calculating unit for calculating the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion of the measured welded pipe, and an outer peripheral surface of the measured welded pipe including a weld bead non-ground portion obtained from the second displacement meter, and Based on the position data of at least one of the inner peripheral surface and the rotation angle data of the rotation shaft obtained from the rotation angle detector, the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portion of the welded pipe to be measured. Position of the weld bead non-ground portion, and the position data of the extra weld end portions on both sides in the circumferential direction of the identified weld bead, and the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion calculated by the first calculator. And a second calculator for calculating the shape and size of the welded portion of the weld bead grinding portion at the pipe end portion of the measured welded pipe.

Further, a shape dimension measuring device for a welded portion of a welded pipe according to another aspect of the present invention is attached to a measurement carriage movable in the pipe axis direction of the welded pipe to be measured so as to move up and down, and the center of the welded pipe to be measured. A rotating mechanism having a rotating shaft rotatable about an axis substantially the same as the axis, a measuring arm attached to the rotating shaft of the rotating mechanism and rotating together with the rotating shaft, and the measured welding to the measuring arm. A pair of first displacements that are mounted so as to be movable in the radial direction of the pipe and that detect the positions of the outer peripheral surface and the inner peripheral surface of the pipe end including the weld bead grinding portion in which the weld bead of the measured welded pipe is ground. And a measuring head having a second displacement gauge for detecting the position of at least one of the outer peripheral surface and the inner peripheral surface of the welded pipe to be measured including the weld bead non-ground portion in which the weld bead is not ground. And a rotation angle for detecting the rotation angle of the rotation shaft of the rotation mechanism, and a control unit for controlling the rotation operation of the rotation shaft of the rotation mechanism, the lifting operation of the rotation mechanism, and the radial movement operation of the measurement head. A detector and a calculation unit for calculating the shape and size of the welded portion of the weld bead grinding portion at the pipe end of the measured welded pipe, the calculation unit of the rotating shaft obtained from the rotation angle detector. The measured welded pipe is based on rotation angle data and position data of the outer peripheral surface and the inner peripheral surface of the pipe end portion including the weld bead grinding portion of the measured welded pipe obtained from the pair of first displacement gauges. A first calculation unit that calculates the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion, and the welding based on the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion calculated by the first calculation unit. A determination unit that determines whether or not the positions of the extra weld end portions on both sides in the circumferential direction of the bead grinding portion can be specified, and when the determination portion determines that the position of the extra weld end portion can be specified, the welding bead grinding portion The positions of the extra ends on both sides in the circumferential direction are specified, the position data of the extra ends on the both sides in the circumferential direction of the identified weld bead grinding portion, and the outer peripheral surface of the pipe end calculated by the first calculator. And a second calculation unit for calculating the geometrical dimension of the welded portion of the weld bead grinding portion at the pipe end portion of the welded pipe to be measured, based on the shape of the inner peripheral surface.

Further, a shape measuring device for a welded portion of a welded pipe according to another aspect of the present invention is attached to a measurement carriage movable in the pipe axis direction of the welded pipe to be measured so as to move up and down, and the center of the welded pipe to be measured. A rotating mechanism having a rotating shaft rotatable about an axis substantially the same as the axis, a measuring arm attached to the rotating shaft of the rotating mechanism and rotating together with the rotating shaft, and the measured welding to the measuring arm. A pair of first displacements that are mounted so as to be movable in the radial direction of the pipe and that detect the positions of the outer peripheral surface and the inner peripheral surface of the pipe end including the weld bead grinding portion in which the weld bead of the measured welded pipe is ground. Position of the inner peripheral surface of the welded pipe to be measured including a measurement head equipped with a meter and rotating with the rotary shaft attached to the rotary shaft of the rotating mechanism, the weld bead not being ground and the weld bead being not ground A second displacement meter for detecting the movement, a control unit for controlling the movement operation of the measurement carriage, the rotation operation of the rotation shaft of the rotation mechanism, the lifting operation of the rotation mechanism, and the radial movement operation of the measurement head, and the rotation. A rotation angle detector that detects the rotation angle of the rotating shaft of the mechanism, and a calculation unit that calculates the shape dimension of the welded portion of the weld bead grinding portion at the pipe end of the measured welded pipe, the calculation unit, Rotation angle data of the rotary shaft obtained from the rotation angle detector, and the outer peripheral surface and the inner peripheral surface of the pipe end portion including the weld bead grinding portion of the measured welded pipe obtained from the pair of first displacement meters A first calculator that calculates the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end of the measured welded pipe based on the position data, and a weld bead non-ground portion that is obtained from the second displacement meter. Based on the position data of the inner peripheral surface of the measured welded pipe and the rotation angle data of the rotating shaft obtained from the rotation angle detector, the circumferential direction of the weld bead non-ground portion of only the inner surface of the measured welded pipe. The positions of the extra ends on both sides are specified, and the position data of the extra ends on both sides in the circumferential direction of the weld bead non-ground portion of only the specified inner surface, and the outer circumference of the pipe end calculated by the first calculator. The gist of the present invention is to calculate the geometrical dimensions of the welded portion of the weld bead grinding portion at the pipe end portion of the measured welded pipe, based on the shapes of the surface and the inner peripheral surface.

ADVANTAGE OF THE INVENTION According to the apparatus for measuring the shape and size of the welded part of the welded pipe according to the present invention, the shape and size of the welded part of the weld bead grinding part at the pipe end part of the welded pipe can be measured fully automatically with high accuracy. It is possible to provide an apparatus for measuring the shape and dimension of the welded part.

It is a schematic block diagram of the shape dimension measuring apparatus of the welding part of the welded pipe which concerns on 1st Embodiment of this invention. A kind of UOE steel pipe of a welded pipe to be measured is shown, (a) is a partial perspective view showing a weld bead ground portion and a weld bead non-ground portion on the outer peripheral surface side of the pipe end portion of the UOE steel pipe, (b) is a UOE It is a partial perspective view which shows the weld bead grinding part and weld bead non-grinding part by the side of the inner peripheral surface in the pipe end part of a steel pipe. Minute unit rotation calculated from the position data of the outer peripheral surface of the UOE steel pipe including the weld bead non-ground portion obtained from the second displacement meter and the rotation angle data of the rotation axis based on the predetermined position obtained from the rotation angle detector It is a graph for demonstrating the method of pinpointing the position of the extra buildup edge part of the circumferential direction both sides of the weld bead non-ground part of a UOE steel pipe from the outer surface radius for every angle. It is a schematic diagram of the outer surface profile in the vicinity of the welded portion at the pipe end portion of the UOE steel pipe when the central position of the weld bead grinding portion is located immediately above. FIG. 5 is an enlarged view of the vicinity of the welded portion in FIG. 4, and is a schematic diagram for explaining the bead height. FIG. 5 is an enlarged view of the vicinity of the welded portion in FIG. 4, and is a schematic diagram for explaining an offset value. FIG. 5 is an enlarged view of the vicinity of the welded portion in FIG. 4 and is a schematic diagram for explaining a peaking value. It is a schematic block diagram of the shape dimension measuring apparatus of the welding part of the welded pipe which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the shape dimension measuring apparatus of the welding part of the welded pipe which concerns on 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. The embodiment is an example of a device for measuring the shape and dimension of a welded portion of a UOE steel pipe as a welded pipe.
The drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the plane size, the ratio, and the like are different from the actual ones, and the drawings include portions where the dimensional relationship and ratio are different from each other. Further, the embodiments described below exemplify a device and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, and arrangement of components are Etc. are not specified in the following embodiments.

(First embodiment)
FIG. 1 shows an outline of an apparatus for measuring a shape and dimension of a welded part of a welded pipe according to a first embodiment of the present invention, and FIGS. 2(a) and 2(b) show a UOE steel pipe to be measured. Has been done.
First, the UOE steel pipe S to be measured will be described. The UOE steel pipe S is manufactured by bending a thick steel pipe by press working, and welding the bent side end faces of the thick steel pipe to each other. As shown in FIGS. 2(a) and 2(b), the welded portion 21 of the pipe end portion 22 of the UOE steel pipe S has both an outer surface (see FIG. 2(a)) and an inner surface (see FIG. 2(b)). A range of about 200 mm from the end face 24 is ground in the manufacturing process. When the pipe end portion 22 of the UOE steel pipe S is viewed in the circumferential direction, there is no boundary step between the weld bead grinding portion 22a on the outer surface side and the weld bead grinding portion 22b on the inner surface side and the base material portion is smooth. .. On the other hand, the weld bead non-grinding portion 23a on the outer surface side and the weld bead non-grinding portion 23b on the inner surface side, which are located closer to the center in the pipe axis direction than the weld bead grinding portions 22a and 22b, have a boundary step with the base metal portion, It can be clearly distinguished from the base metal part.

Next, the shape dimension measuring device 1 for the welded portion 21 of the UOE steel pipe S shown in FIG. 1 has a shape and dimension of the welded portion 21 of the weld bead grinding portions 22a, 22b at the pipe end portion 22 of the UOE steel pipe S, specifically, The outer surface peaking value, the outer surface offset value, the outer surface bead height, the inner surface peaking value, the inner surface offset value, and the inner surface bead height of the weld portion 21 of the weld bead grinding portions 22a and 22b are measured. The outer surface peaking value, outer surface offset value, outer surface bead height, inner surface peaking value, inner surface offset value, and inner surface bead height will be described later.
The shape dimension measuring device 1 includes a measuring carriage 2, a rotating mechanism lifting mechanism 4, a rotating mechanism 5, a measuring arm 7, a radial moving mechanism 8, a measuring head 9, a rotation angle detector 6, and The control unit 13 and the calculation unit 14 are provided.

Here, the measurement carriage 2 is arranged so as to be movable along a traveling rail 3 parallel to a direction (pipe axis direction) in which the central axis C1 of the UOE steel pipe S which is one of the welded pipes to be measured extends.
The rotating mechanism elevating mechanism 4 elevates and lowers the rotating mechanism 5 with respect to the measurement carriage 2, and is rotatable by an upright portion 4a standing upright from the measurement carriage 2 and a pair of upper and lower bearings (not shown) on the upright portion 4a. It includes a supported ball screw shaft 4b, a pair of nut members 4c that move up and down by the rotation of the ball screw shaft 4b, and a motor 4d that rotationally drives the ball screw shaft 4b.

Further, the rotation mechanism 5 is attached to the measurement carriage 2 by the rotation mechanism elevating mechanism 4 so as to be able to move up and down, and the base portion 5a attached to the nut member 4c of the rotation mechanism elevating mechanism 4 and the base portion 5a. The drive motor 5b is fixed to the rotary shaft 5c, the rotary shaft 5c is rotated by the drive motor 5b, and the rotary plate 5d is fixed to the tip of the rotary shaft 5c. The rotating mechanism 5 is moved up and down by the rotating mechanism elevating mechanism 4 so that the central axis C2 of the rotating shaft 5c is substantially aligned with the central axis C1 of the UOE steel pipe S, and the central axis C2 of the rotating shaft 5c is the same as that of the UOE steel pipe S. When substantially coincident with the central axis C1, the rotating shaft 5c is adapted to rotate 360 degrees about an axis substantially the same as the central axis C1 of the UOE steel pipe S. When the rotating shaft 5c rotates, the rotating plate 5d fixed to the tip of the rotating shaft 5c also rotates.

The measuring arm 7 is a member that extends in the radial direction of the UOE steel pipe S, is attached to the rotating plate 5d of the rotating mechanism 5, and rotates together with the rotating plate 5d. The rotation center of the measurement arm 7 is the center axis C2 of the rotation shaft 5c. Therefore, when the central axis C2 of the rotating shaft 5c substantially coincides with the central axis C1 of the UOE steel pipe S, the measuring arm 7 rotates 360 degrees about the same axis as the central axis C1 of the UOE steel pipe S.
The radial movement mechanism 8 moves the measurement head 9 in the radial direction of the UOE steel pipe S, and includes a ball screw 8a rotatably supported by a pair of bearings (not shown) on the measurement arm 7 and a ball screw shaft. A pair of nut members 8b that move in the radial direction by the rotation of 8a and a motor 8c that rotationally drives the ball screw shaft 8a are provided.

The measuring head 9 is fixed to the nut member 8b of the radial movement mechanism 8 and is attached to the measuring arm 7 so as to be movable in the radial direction of the UOE steel pipe S.
The measuring head 9 includes an outer circumference displacement gauge mounting bar 12a located radially outside the UOE steel pipe S and an inner circumference displacement gauge mounting bar 12b located radially inside the outer circumference displacement gauge mounting bar 12a. Is attached. Then, the displacement gauge mounting bar 12a for the outer circumference detects the position of the outer circumferential surface of the pipe end portion 22 including the weld bead grinding portion 22a (see FIG. 2A) in which the weld bead of the UOE steel pipe S is ground. A first displacement meter 10a for use is installed. Further, a weld bead grinding portion 22b (see FIG. 2(b)) obtained by grinding the weld bead of the UOE steel pipe S is provided at a position facing the first displacement gauge 10a for the outer circumference of the displacement gauge mounting bar 12b for the inner circumference. A first displacement gauge 10b for the inner circumference, which detects the position of the inner circumference surface of the tube end portion 22 including it, is installed. The first displacement gauges 10a and 10b for the outer circumference and the inner circumference each include a laser displacement gauge or a touch roller rotatable when brought into contact with the inner and outer surfaces of the UOE steel pipe S by an air cylinder or the like. A contact type displacement gauge is used.

Further, the outer peripheral displacement gauge mounting bar 12a of the measuring head 9 has a second outer peripheral side which is arranged at a predetermined distance L from the outer peripheral side first displacement gauge 10a toward the center of the UOE steel pipe S in the axial direction of the pipe. A displacement meter 11a is installed. The second displacement gauge 11a on the outer peripheral side detects the position of the outer peripheral surface of the UOE steel pipe S including the weld bead non-ground portion 23a (see FIG. 2A) in which the weld bead is not ground. Further, the UOE including the weld bead non-grinding portion 23b (see FIG. 2(b)) in which the weld bead is not ground is provided at a position of the inner periphery displacement gauge mounting bar 12b facing the outer periphery second displacement gauge 11a. A second displacement gauge 11b on the inner peripheral side for detecting the position of the inner peripheral surface of the steel pipe S is installed. Each of the second displacement gauges 11a and 11b for the outer circumference and the inner circumference also includes a laser displacement gauge, and a touch roller rotatable when contacted by pressing the inner and outer surfaces of the UOE steel pipe S against the inner and outer surfaces of the UOE steel pipe S with an air cylinder or the like. A contact type displacement gauge is used.

The predetermined distance L between the pair of first displacement meters 10a, 10b and the pair of second displacement meters 11a, 11b is set to be 250 mm to 500 mm.
The rotation angle detector 6 is attached to the base portion 5a of the rotation mechanism 5 and detects the rotation angle of the measurement arm 7 by detecting the rotation angle of the rotation shaft 5c of the rotation mechanism 5.
Further, the control unit 13 is connected to a traveling motor (not shown) of the measurement carriage 2 and controls the movement operation of the measurement carriage 2. Further, the control unit 13 is connected to the drive motor 5b of the rotating mechanism 5 to control the rotating operation of the rotating shaft 5c of the rotating mechanism 5, and is connected to the motor 4d of the rotating mechanism elevating mechanism 4 to allow the rotating mechanism 5 to rotate. The lifting/lowering operation is controlled, and the radial movement operation of the measuring head 9 is controlled by being connected to the motor 8c of the radial movement mechanism 8. The control unit 13 is connected to an input unit (not shown) and a host computer, and is configured by a computer having an arithmetic processing function.

Further, the calculation unit 14 is connected to the pair of first displacement gauges 10a and 10b, the pair of second displacement gauges 11a and 11b, and the rotation angle detector 6, and the pair of first displacement gauges 10a and 10b and the pair of first displacement gauges 10a and 10b. Based on the information obtained from the second displacement gauges 11a and 11b and the rotation angle detector 6, the shape and dimension of the welded portion 21 of the weld bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S described above are calculated. To do. The arithmetic unit 14 is composed of a computer having an arithmetic processing function.
Here, the calculation unit 14 includes a first calculation unit 14a and a second calculation unit 14b.

The first calculator 14a obtains the rotation angle data of the rotary shaft 5c based on the predetermined position of the pipe end portion 22 of the UOE steel pipe S obtained from the rotation angle detector 6 and the pair of first displacement gauges 10a and 10b. Of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 of the UOE steel pipe S based on the position data of the outer peripheral surface and the inner peripheral face of the pipe end portion 22 including the weld bead grinding portions 22a and 22b of the UOE steel pipe S To calculate. Here, the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 are the outer surface radius of the outer peripheral surface of the pipe end portion 22 and the inside of the pipe end portion 22 with reference to a predetermined position in the pipe end portion 22 of the UOE steel pipe S. It is the inner radius of the peripheral surface.
In addition, the second calculating unit 14b, the position data of both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-grinding portions 23a, 23b obtained from the pair of second displacement gauges 11a, 11b, and the rotation angle. Based on the rotation angle data of the rotary shaft 5c based on the predetermined position of the UOE steel pipe S obtained from the detector 6, the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portions 23a, 23b of the UOE steel pipe S. Specify.

Then, the second calculating unit 14b calculates the position data of the extra weld end portions on both sides in the circumferential direction of the identified weld bead non-grinding portions 23a and 23b, and the outer peripheral surface of the pipe end portion 22 calculated by the first calculating unit 14a. Based on the shape of the inner peripheral surface, the shape size of the welded portion 21 of the weld bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S is calculated. Here, as described above, the shape and size of the welded portion 21 of the weld bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S are the outer surface peaking value and the outer surface of the welded portion 21 of the weld bead grinding portions 22a and 22b. The offset value, the outer bead height, the inner peaking value, the inner offset value, and the inner bead height are measured. Details of the calculation of these values will be described later.
An output unit 15 including an output device such as a printer is connected to the arithmetic unit 14. The calculation result of the calculation unit 14 is output to the output unit 15.

Next, using the geometry measuring device 1 for the welded portion 21 of the UOE steel pipe S shown in FIG. 1, the geometry of the welded portion 21 of the weld bead grinding portions 22a, 22b at the pipe end 22 of the UOE steel pipe S is calculated. The method will be described.
First, the UOE steel pipe S is carried in by a chain conveyor (not shown) and stopped at a predetermined position.
Next, when the operator inputs a measurement start signal from the input unit (not shown) to the control unit 13 of the shape/dimension measuring apparatus 1, the control unit 13 is based on the nominal outer diameter dimension value of the UOE steel pipe S from the host computer (not shown). Get height information. Then, the control unit controls the motor 4d of the rotating mechanism elevating mechanism 4 based on the height information based on the nominal outer diameter dimension value of the UOE steel pipe S so that the central axis C2 of the rotating shaft 5c is the central axis line of the UOE steel pipe S. The lifting operation of the rotating mechanism 5 is controlled so that the rotating mechanism 5 is positioned near C1, and the height of the rotating shaft 5c is adjusted. At this time, the control unit 13 controls the drive motor 5b of the rotating mechanism 5 to control the rotating operation of the rotating shaft 5c of the rotating mechanism 5 so that the measuring arm 7 coincides with the apex in the circumferential direction of the UOE steel pipe S. Position control.

Then, the control unit 13 of the shape dimension measuring apparatus 1 acquires the nominal outer diameter dimension value and the nominal tube thickness value of the UOE steel pipe S from the host computer, and moves in the radial direction from the nominal outer diameter dimension value and the nominal tube thickness value. By controlling the motor 8c of the mechanism 8, the center line C3 between the pair of first displacement gauges 10a and 10b and between the pair of second displacement gauges 11a and 11b is approximately equal to the pipe thickness center value at the apex position of the UOE steel pipe S. The radial movement operation of the measuring head 9 is controlled so that the height of the measuring head 9 is adjusted to the height of the measuring head 9. At this time, the pair of first displacement gauges 10a and 10b and the pair of second displacement gauges 11a and 11b are located at positions corresponding to the apexes of the UOE steel pipe S in the circumferential direction.
Subsequently, the control unit 13 controls a traveling motor (not shown) of the measurement carriage 2 based on the position information of the UOE steel pipe S to move the measurement carriage 2 on the traveling rail 3 toward the UOE steel pipe S, and to perform pairing. The first displacement gauges 10a and 10b of No. 3 are stopped at a position within 30 mm from the pipe end surface 24 of the UOE steel pipe S. At this time, the pair of second displacement gauges 11a and 11b stop at a predetermined distance L (about 250 mm to 500 mm) from the pair of first displacement gauges 10a and 10b toward the center side in the axial direction of the UOE steel pipe S.

Next, in this state, the control unit 13 controls the drive motor 5b of the rotating mechanism 5 so that the measuring arm 7 and the measuring head 9 rotate 360 degrees about the central axis C2 of the rotating shaft 5c. At this time, the first calculator 14a of the calculator 14 uses the predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) at the pipe end 22 of the UOE steel pipe S obtained from the rotation angle detector 6 as a reference. Angle data of the rotating shaft 5c (measurement arm 7), and the outer and inner surfaces of the pipe end 22 including the weld bead grinding portions 22a and 22b of the UOE steel pipe S obtained from the pair of first displacement gauges 10a and 10b. Of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 based on a predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) on the pipe end portion 22 of the UOE steel pipe S based on the surface position data. Calculate the shape.

Specifically, the first calculating unit 14a of the calculating unit 14 determines the predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) at the pipe end 22 of the UOE steel pipe S obtained from the rotation angle detector 6. For each minute unit rotation angle of the measurement arm 7 used as a reference (starting point), the outer peripheral surface of the pipe end portion 22 including the weld bead grinding portions 22a, 22b of the UOE steel pipe S obtained from the pair of first displacement gauges 10a, 10b and From the position data of the inner peripheral surface and the position data of the center of rotation of the measuring arm 7 (the center axis C2 of the rotating shaft 5c and the center axis C1 of the UOE steel pipe S), the outer surface of the outer peripheral surface of the pipe end 22 is determined. The radius and the inner radius of the inner peripheral surface are calculated.

The second calculator 14b of the calculator 14 is obtained from the pair of second displacement gauges 11a and 11b when the measurement arm 7 and the measurement head 9 rotate 360 degrees about the central axis C2 of the rotation shaft 5c. Position data of both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b, and a predetermined position of the UOE steel pipe S obtained from the rotation angle detector 6 (in the circumferential direction of the UOE steel pipe S Based on the rotation angle data of the rotary shaft 5c (measurement arm 7) based on the position of the apex), the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portions 23a and 23b of the UOE steel pipe S are specified. ..

More specifically, the second calculator 14b of the calculator 14 uses the predetermined position of the UOE steel pipe S (the position of the apex in the circumferential direction of the UOE steel pipe S) obtained from the rotation angle detector 6 as a reference (starting point). With respect to each minute unit rotation angle of the measured arm 7, the position data of both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a, 23b obtained from the pair of second displacement gauges 11a, 11b are stored. From the position data of the rotation center of the measurement arm 7 (the center axis C2 of the rotation shaft 5c and the center axis substantially the same as the center axis C1 of the UOE steel pipe S), the outer surface radius of the UOE steel pipe S and the inner surface radius of the inner surface are determined. And calculate. Then, the second calculator 14b of the calculator 14 calculates the welding bead non-grinding parts 23a, 23b on the outer surface and the inner surface from the outer surface radius and the inner surface radius of the UOE steel pipe S calculated over the entire circumference by a calculation method described later. Specify the center position and the positions of the extra edge on the left and right sides.

Further, the second calculating unit 14b of the calculating unit 14 detects the position data of the extra weld end portions on both sides in the circumferential direction of the identified weld bead non-grinding portions 23a and 23b and the UOE steel pipe S calculated by the first calculating unit 14a. Based on the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 with reference to a predetermined position in the pipe end portion 22 (the position of the apex in the circumferential direction of the UOE steel pipe S), the pipe end portion of the UOE steel pipe S The shape dimension of the welded portion 21 of the weld bead grinding portions 22a and 22b in 22 is calculated.
Specifically, the second calculating unit 14b of the calculating unit 14 determines the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portions 23a, 23b of the specified UOE steel pipe S as the pipe end of the UOE steel pipe S. It is regarded as a boundary position between the weld bead grinding portions 22a and 22b in the portion 22 and the base material portion of the welding portion 21. Then, the second calculating unit 14b of the calculating unit 14 calculates the boundary position data on both sides of the weld bead grinding portions 22a and 22b of the pipe end portion 22 of the UOE steel pipe S by the first calculating unit 14a described above. The UOE steel pipe S is fitted to the shapes of the inner peripheral surface and the outer peripheral surface of the pipe end portion 22 with reference to the calculated predetermined position in the pipe end portion 22 of the UOE steel pipe S (the position of the apex in the circumferential direction of the UOE steel pipe S). The geometrical dimensions of the welded portion 21 of the weld bead grinding portions 22a and 22b at the pipe end portion 22 are calculated.

Then, the geometry of the welded portion 21 of the weld bead grinding portions 22 a and 22 b in the pipe end portion 22 of the UOE steel pipe S calculated by the second calculation unit 14 b of the calculation unit 14 is output to the output unit 15.
As described above, according to the shape/dimension measuring apparatus 1 for the welded portion 21 of the welded pipe according to the present embodiment, the extra welded ends of the weld bead non-ground portions 23a, 23b of the UOE steel pipe S (measured welded pipe) on both sides in the circumferential direction. By welding the bead grinding portions 22a and 22b of the pipe end portion 22 including the weld bead grinding portions 22a and 22b in which the boundary between the welding portion and the base metal portion is unclear by identifying the position of the portion The positions of the extra weld end portions on both sides in the circumferential direction of the portion 21 can be accurately specified, whereby the shape and size of the weld portion 21 of the weld bead grinding portions 22a and 22b can be measured.
Then, in measuring the shape and dimension, as described above, after the UOE steel pipe S is stopped at a predetermined position, the operator simply inputs a measurement start signal to the control unit 13, and the pipe end portion of the UOE steel pipe S The shape and size of the welded portion 21 of the weld bead grinding portions 22a and 22b in 22 can be measured fully automatically with high accuracy.

Next, FIG. 3A shows a calculation method in which the second calculation unit 14b of the calculation unit 14 specifies the center positions of the weld bead non-ground portions 23a and 23b on the outer surface and the inner surface and the positions of the extra weld end portions on both sides in the circumferential direction. ) And (b). 3A and 3B, the weld bead non-grinding portion 23a on the outer surface when only the second displacement gauge 11a for detecting the position of the outer peripheral surface of the UOE steel pipe S including the weld bead non-grinding portion 23a is provided. A method for specifying the center position of the and the positions of the extra edge portions on the left and right sides is shown. By the second displacement gauge 11b for detecting the position of the inner peripheral surface of the UOE steel pipe S including the inner weld bead non-ground portion 23b, the center position of the inner weld bead non-ground portion 23b and the positions of the extra weld end portions on both sides in the circumferential direction are determined. The method for specifying is the same as the method for specifying the center position of the weld bead non-grinding portion 23a on the outer surface and the positions of the extra weld end portions on both sides in the circumferential direction by the second displacement gauge 11a, and therefore the description thereof will be omitted.

FIG. 3A shows a rotary shaft 5c (measurement arm) obtained from the rotary angle detector 6 when the second displacement gauge 11a is positioned on the apex of the UOE steel pipe S and rotated 360 degrees with the rotary angle as 0 degree. 7) The rotation angle, the position of the outer peripheral surface of the UOE steel pipe S including the weld bead non-ground portion 23a obtained from the second displacement meter 11a when the second displacement meter 11a is at each rotation angle position, and the measurement arm 7 Is a graph showing the relationship with the outer surface radius of the UOE steel pipe S, which is obtained by calculating the distance between the rotation center (the center axis C2 of the rotation axis 5c) of the, and is a graph of a total of 2000 points of data. 3(b), the rotation axis 5c (obtained from the rotation angle detector 6 when rotated by 360 degrees with the rotation angle when the second displacement gauge 11a is positioned on the apex of the UOE steel pipe S set to 0 degree ( It is a graph which shows the relationship of the rotation angle of the measurement arm 7) and the value which subtracted 51 moving averages from the outer surface radius in each said rotation angle.

Here, referring to FIG. 3( a ), a large sine curve-like waviness is obtained at a small outer surface radius of 299.6 mm (a rotation angle of about 130 degrees) and a large outer radius of 307.9 mm (a rotation angle of about 290 degrees). Is occurring. The reason for this is that the center axis C2 of the rotating shaft 5c, which is the center of rotation of the measuring arm 7, is displaced from the center axis C1 of the UOE steel pipe S.
In FIG. 3(a), the protrusions shown by the arrows located at a rotation angle of about 45 degrees correspond to the welded portions, but if they remain as they are, the position of the welded portions (rotation The angle) cannot be specified.

Therefore, as shown in FIG. 3B, a process of removing the sine curve-like undulation from FIG. 3A is performed. Specifically, in FIG. 3B, the horizontal axis is 360 degrees with the rotation angle when the second displacement gauge 11a is located on the apex of the UOE steel pipe S as 0 degrees, as in FIG. 3A. The rotation angle of the rotation shaft 5c (measurement arm 7) obtained from the rotation angle detector 6 when rotated is shown. In addition, the vertical axis in FIG. 3B includes the rotation angle data of all 2000 points, the outer radius of the rotation angle data of interest, and the rotation angle data of 25 points before and after the rotation angle data of interest 51. A value obtained by subtracting the average value of the outer surface radii of the data and subtracting the 51 moving average from the outer surface radii at each rotation angle plotted is shown.

Referring to FIG. 3B, the rotation angles 41 and 49, which are the peak values on the left and right negative sides across the angle of 45 degrees, where the vertical axis is the peak value, indicate the circumference of the weld bead non-grinding portion 23a. The positions (angle data) of the extra ridge ends on both sides in the direction can be easily calculated. The center position of the weld bead non-grinding portion 23a is 45 degrees (=(41 degrees+49 degrees)/2) which is intermediate between the two.
The second calculation unit 14b of the calculation unit 14 performs the above calculation to identify the center position of the weld bead non-grinding portion 23a on the outer surface and the positions of the extra weld end portions on both sides in the circumferential direction. Then, the second calculator 14b of the calculator 14 performs the same calculation to identify the center position of the weld bead non-grinding portion 23a on the inner surface and the positions of the extra weld end portions on both sides in the circumferential direction by the second displacement gauge 11b.

The second displacement gauges 11a and 11b are provided as a pair so as to measure both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b in which the weld beads are not ground. However, the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion 23a on the outer surface and the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion 23b on the inner surface are slightly deviated from each other. If the case is ignored, one second displacement gauge may be provided to detect the position of at least one of the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b.
Then, the second calculating unit 14b of the calculating unit 14 uses the first position data of the center position of the weld bead non-ground portion 23a or 23b in the circumferential direction of the specified UOE steel pipe S and the position data of the extra weld end portions on both sides in the circumferential direction as the first data. The shape of the inner peripheral surface and the outer peripheral surface of the pipe end portion 22 based on the predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) at the pipe end portion 22 of the UOE steel pipe S calculated by the calculation unit 14a Fitting and based on this, the geometrical dimensions of the welded portions 21 of the weld bead grinding portions 22a and 22b at the pipe end portion 22 are calculated.

A pair of second displacement gauges 11a and 11b are provided to detect the positions of both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-grinding portions 23a and 23b, and the second of the calculation unit 14 The calculation unit 14b uses the position data of both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a, 23b obtained from the pair of second displacement gauges 11a, 11b to determine the UOE steel pipe S. It is desirable to identify the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portions 23a and 23b. The positions of the extra weld end portions on both sides in the circumferential direction of the outer weld bead non-grinding portion 23a and the inner weld bead non-grinding portion 23b may be slightly different, but in this case, the positions of the extra weld end portions were calculated individually. This is because it is possible to measure the shape and dimension of the welded portion 21 of the weld bead grinding portions 22a and 22b with higher accuracy.

Here, the measurement positions in the pipe axis direction of the UOE steel pipe S in the first displacement gauges 10a, 10b and the second displacement gauges 11a, 11b are such that their installation intervals (predetermined distance) L are in the vicinity of 250 mm to 500 mm, The positional deviation in the circumferential direction of the weld bead grinding portions 22a, 22b due to the bending or twisting of the UOE steel pipe S is very small, and the positions of the extra weld end portions on both sides in the circumferential direction of the welding bead non-grinding portions 23a, 23b are specified. The positions of the extra weld end portions on both sides in the circumferential direction of the weld bead ground portions 22a, 22b of the pipe end portion 22 including the weld bead ground portions 22a, 22b can be specified with high accuracy.
Moreover, the welding bead grinding parts 22a and 22b are included by shifting the measurement position of the measurement carriage 2 in the pipe axis direction of the UOE steel pipe S with only the first displacement gauges 10a and 10b without the second displacement gauges 11a and 11b. If the shape of the inner and outer circumferences of the pipe end portion 22 and the shape of the inner and outer circumferences of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b are measured twice, the number of displacement gauges can be reduced and the cost is reduced. However, since the measurement time is required accordingly, it is necessary to dispose both displacement gauges.

Next, a specific method of calculating the shape and size of the welded portion 21 of the weld bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S by the second calculation unit 14b of the calculation unit 14 will be described with reference to FIGS. Will be explained.
(1) Calculation of the outer peripheral surface and the inner peripheral surface of the pipe end portion First, as described above, the first calculating portion 14a of the calculating portion 14 is the pipe end portion of the UOE steel pipe S obtained from the rotation angle detector 6. The UOE steel pipe S obtained from the pair of first displacement gauges 10a and 10b for each minute unit rotation angle of the measuring arm 7 with the predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) of 22 as a reference (starting point). Position data of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 including the weld bead grinding portions 22a and 22b, and the rotation center of the measuring arm 7 (the center axis C2 of the rotating shaft 5c and the center axis C1 of the UOE steel pipe S are almost the same. The outer surface radius of the outer peripheral surface of the tube end portion 22 and the inner surface radius of the inner peripheral surface of the tube end portion 22 are calculated.

Here, first, the outer surface radius of the outer surface of the pipe end portion 22 will be described. An outer peripheral surface data string obtained when the first displacement meter 10a is rotated by 360 degrees (of the UOE steel pipe S obtained from the first displacement meter 10a). The position data of the outer peripheral surface of the pipe end portion 22 including the weld bead grinding portion 22a is applied to the equation of a circle, and the center of the circle is calculated using the least squares method, that is, the pipe end portion including the weld bead grinding portion 22a of the UOE steel pipe S. The center point PC (see FIG. 4) of the 22 external profile is determined.
Then, the distance from the center point PC to the outer peripheral surface data string is converted into an outer peripheral surface radius data string (angle, outer peripheral surface radius) to be the outer surface radius of the outer peripheral surface of the pipe end portion 22.

The same calculation is performed for the inner surface radius of the inner surface of the pipe end portion 22, and the inner peripheral surface data string obtained when the first displacement meter 10b is rotated by 360 degrees (UOE obtained from the first displacement meter 10b). The position data of the inner peripheral surface of the pipe end portion 22 including the weld bead ground portion 22b of the steel pipe S) is applied to the equation of the circle, and the center of the circle, that is, the weld bead ground portion 22b of the UOE steel pipe S is determined by the least square method. The center point PC′ (see FIG. 4) of the inner surface profile of the containing pipe end 22 is determined.
Then, the distance from the center point PC′ to the inner peripheral surface data string is converted into an inner peripheral surface radius data string (angle, inner peripheral surface radius) to obtain the inner surface radius of the inner peripheral surface of the pipe end portion 22.

(2) Specifying the position of the extra weld end and fitting the specified position of the extra weld end to the shapes of the inner peripheral surface and the outer peripheral surface of the pipe end Then, the second calculating unit 14b of the calculating unit 14 calculates over the entire circumference. From the outer surface radius and the inner surface radius of the UOE steel pipe S thus obtained, the central position of the weld bead non-ground portions 23a and 23b on the outer surface and the inner surface and the positions of the extra-filled end portions on both sides in the circumferential direction are specified by the above-described calculation method.
Then, the second calculator 14b of the calculator 14 welds the positions of the extra weld end portions of the identified weld bead non-ground portions 23a, 23b of the UOE steel pipe S on both sides in the circumferential direction at the pipe end 22 of the UOE steel pipe S. Boundary position data on both sides of the welded portion 21 of the weld bead grounded portions 22a, 22b in the pipe end portion 22 of this UOE steel pipe S is regarded as the boundary position between the bead grounded portions 22a, 22b and the base metal portion. Shapes of the inner peripheral surface and the outer peripheral surface of the pipe end portion 22 with reference to a predetermined position (the position of the apex in the circumferential direction of the UOE steel pipe S) at the pipe end portion 22 of the UOE steel pipe S calculated by the first calculation unit 14a Apply to

Here, in the above-mentioned converted outer peripheral surface radius data string (angle, outer peripheral surface radius), the center position of the weld bead non-grinding portion 23a of the outer surface specified by the calculation of the second calculating unit 14b and both sides in the circumferential direction. From the position of the extra edge, which data is stored is the central position of the weld bead grinding portion 22a on the outer surface and the positions of the extra edges on both sides in the circumferential direction.
Similarly, in the above-described converted inner peripheral surface radius data string (angle, inner peripheral surface radius), the center position and the circle of the weld bead non-grinding portion 23b of the inner surface specified by the calculation of the second calculating unit 14b. Which data is the center position of the weld bead grinding portion 22b on the inner surface and the positions of the extra ends on both sides in the circumferential direction are stored from the positions of the extra ends on both sides in the circumferential direction.

(3) Rotational Moving Process of Position of Weld Bead Grinding Part Next, for convenience, the above-mentioned pipe is set so that the center position of the weld bead grinding part 22a of the outer surface, which is stored in the above, is a position directly above, that is, 0°. The center point PC of the outer surface profile of the end 22 is rotationally moved about the central axis of rotation. Further, the center point PC′ of the inner surface profile of the pipe end portion 22 described above is rotationally moved so that the center position of the weld bead grinding portion 22b on the inner surface, which is stored as described above, becomes 0°.
FIG. 4 shows a schematic diagram of the outer surface profile in the vicinity of the welded portion 21 of the pipe end portion 22 at this time. In FIG. 4, the curve shown by the solid line is the outer surface profile, and the curve shown by the broken line is the inner surface profile. Further, BL and BR indicated by black dots are boundary positions with the base metal portions on both sides in the circumferential direction of the weld portion 21 on the outer surface of the pipe end portion 22 of the UOE steel pipe S (in the circumferential direction of the weld bead grinding portion 22a on the outer surface). BC is the central position of the welded portion 21, and the horizontal distance between BL and BC is equal to the horizontal distance between BC and BR. Similarly, BL′ and BR′ indicated by black dots are the boundary positions with the base metal portions on both sides in the circumferential direction of the welded portion 21 on the inner surface of the pipe end portion 22 of the UOE steel pipe S (in the weld bead grinding portion 22b on the inner surface). BC' is the central position of the welded portion 21, and the horizontal distance between BL' and BC' is equal to the horizontal distance between BC' and BR'. Further, a center line C4 shown by a one-dot chain line in FIG. 4 shows a straight line that passes through the center position BC of the welded portion 21 and extends right below, and on this straight line, the pipe end portion of the UOE steel pipe S described above is formed. The center point PC of the outer profile at 22 will be located. Similarly, the center point PC′ of the inner surface profile of the pipe end portion 22 of the UOE steel pipe S described above is also located on this straight line.

(4) Calculation of Shape and Dimension of Welding Part 21 of Weld Bead Grinding Part at Pipe End of UOE Steel Pipe Welding bead grinding parts 22a and 22b of pipe end 22 of UOE steel pipe S have welding bead shape It means the outer surface peaking value, the outer surface offset value, the outer surface bead height, the inner surface peaking value, the inner surface offset value, and the inner surface bead height of the welded portion 21 of the grinding portions 22a and 22b.

A. Calculation of Outer Bead Height and Inner Bead Height With reference to FIG. 5, a method of calculating the outer bead height and the inner bead height will be described.
FIG. 5 is an enlarged view of the vicinity of the welded portion 21 in FIG. 4, and normally, the welded portion 21 of the weld bead grinding portion 22a cannot determine the boundary with the base metal portion from the outer surface profile and the inner surface profile. Although it has been ground so much, for the sake of explanation, it is shown as a diagram having a surplus shape.
In FIG. 5, the calculation of the outer bead height will be described first. Of the data from the left boundary BL to the right boundary BR of the weld bead grinding portion 22a on the outer surface profile with the base metal portion of the weld portion 21, the central point The maximum value of the distance from the PC (see FIG. 4) (corresponding to r(BP) indicating the BP-PC distance in the example of FIG. 5) is calculated.

The two left and right curves shown by broken lines in FIG. 5 are radii r(BL), r(BR) centered on the center point PC, starting from the boundaries BL and BR with the base metal portion of the welded portion 21, respectively. ) Is an ideal arc. The outer bead height is defined as the average value of the distance between r(BP) described above and these two ideal arcs. That is, the outer bead height BH is expressed by the following equation (1).
BH=((r(BP)-r(BL))+(r(BP)-r(BR)))/2
=(2r(BP)-r(BL)-r(BR))/2 (1)
Therefore, the outer bead height represented by the equation (1) is calculated.

On the other hand, the calculation of the inner bead height will be described. Of the data from the left boundary BL' to the right boundary BR' of the weld bead grinding portion 22b on the inner surface profile with the base metal portion of the weld portion 21, the center point PC' The minimum value of the distance from (see FIG. 4) (corresponding to r(BP′) indicating the distance between BP′ and PC′ in the example of FIG. 5) is calculated.
Further, in FIG. 5, the inner bead height is defined as an average value of the distances between the above-mentioned r(BP′) and the two ideal arcs r(BL′) and r(BR′). That is, the inner bead height BH′ is expressed by the following equation (2).
BH′=((r(BL′)−r(BP′))+(r(BR′)−r(BP′)))/2
=(r(BL')+r(BR')-2r(BP'))/2 (2)
Therefore, the height of the inner bead represented by the equation (2) is calculated.

B. Calculation of outer surface offset value and inner surface offset value As shown in FIG. 6, the outer surface offset value BO is obtained by calculating the difference between the vertical coordinates of the boundaries BL and BR between the left and right base metal parts of the welded portion 21 on the outer surface. Desired.
On the other hand, the inner surface offset value BO′ is obtained by calculating the difference between the vertical coordinates of the boundaries BL′ and BR′ between the left and right base material portions of the welded portion 21 on the inner surface.

C. Calculation of Outer Surface Peaking Value and Inner Surface Peaking Value As shown in FIG. 7, the outer surface peaking value is first equidistant from the center line C4 passing through the center position BC of the welded portion 21 to the left and right sides W (for example, W=75 mm). ) Are searched for points EL and ER on the peripheral profile, and the distances r(EL) and r(ER) from the center point PC (see FIG. 4) at each point are obtained.
Then, by subtracting r(EL) and r(ER) from the distances r(BL) and r(BR) from the center point PC of the boundaries BL and BR to the left and right base metal parts of the welded portion 21, respectively. , The left outer surface peaking PL and the right outer surface peaking PR are obtained. For example, the larger absolute value of PL and PR is set as the outer surface peaking value P.

On the other hand, the inner surface peaking value is, as shown in FIG. 7, first, at a point EL′ on the inner peripheral profile that is equidistant from the centerline C4 passing through the center position BC′ of the welded portion 21 on both left and right sides and ER' is searched and the distances r(EL') and r(ER') from the center point PC' (see FIG. 4) at each point are obtained.
Then, the distances r(BL') and r(BR') from the center points PC' of the boundaries BL' and BR' of the welded part 21 to the left and right base metal parts are r(EL') and r(, respectively). ER') is subtracted to obtain the left inner surface peaking PL' and the right inner surface peaking PR'. For example, the larger absolute value of PL' and PR' is set as the inner surface peaking value P'.
By doing so, the shape and size of the welded portion 21 of the weld bead ground portions 22a and 22b at the pipe end portion 22 of the UOE steel pipe S, that is, the outer surface peaking value and the outer surface offset of the welded portion 21 of the weld bead ground portions 22a and 22b. The value, the outer bead height, the inner peaking value, the inner offset value, and the inner bead height can be calculated.

(Second embodiment)
FIG. 8 schematically shows a shape dimension measuring device for a welded portion of a welded pipe according to a second embodiment of the present invention.
The shape measurement device 1 for a welded portion of the welded pipe according to the second embodiment shown in FIG. 8 has the same basic configuration as the shape measurement device 1 according to the first embodiment shown in FIG. The configuration is different.
That is, the calculation unit 14 of the shape dimension measuring apparatus 1 according to the second embodiment includes the first calculation unit 14a, the determination unit 14c, and the second calculation unit 14b.

Here, the 1st calculation part 14a is the same as the 1st calculation part 14a of the calculation part 14 of the shape dimension measuring apparatus 1 which concerns on 1st Embodiment, The pipe end part of the UOE steel pipe S obtained from the rotation angle detector 6. The rotation angle data of the rotary shaft 5c based on the predetermined position in 22 and the outer peripheral surface of the pipe end portion 22 including the weld bead grinding portions 22a and 22b of the UOE steel pipe S obtained from the pair of first displacement gauges 10a and 10b, and The shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 of the UOE steel pipe S are calculated based on the position data of the inner peripheral surface. Here, the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 are similar to those described above, and the outer surface radius and the pipe of the outer peripheral surface of the pipe end portion 22 with reference to a predetermined position in the pipe end portion 22 of the UOE steel pipe S. It is the inner surface radius of the inner peripheral surface of the end portion 22.

The determination unit 14c determines the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portions 22a and 22b based on the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 calculated by the first calculating unit 14a. Is determined.
This is effective when the grinding of the welded portions in the weld bead grinding portions 22a and 22b is insufficient, for example, and the boundary with the base material portion is clear, and the determination portion 14c allows the welding bead grinding portions 22a and 22b to be separated. When it is determined that the positions of the extra weld ends on both sides in the circumferential direction can be specified, the welding bead grinding units 22a, 22b are used by the second calculating unit 14b without using information from the second displacement gauges 11a, 11b, as will be described later. It is possible to specify the positions of the extra edge portions on both sides in the circumferential direction of the.

More specifically, the calculation described in FIG. 3 is performed on the outer surface profile data including the weld bead grinding portion 22a in the pipe end portion 22, and at this time, two negative waveforms of the differential waveform shown in FIG. A threshold value (for example, -0.3 in FIG. 3B) to be compared with the side peak value (41° position and 49° position) is provided. Then, the absolute value of this threshold value is compared with the absolute value of the two negative peak values (41° position and 49° position), and the absolute value of the two negative peak values (41° position and 49° position) Is larger than the absolute value of the threshold value, the determination unit 14c determines that the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portion 22a on the outer surface can be specified. This determination principle is the same for specifying the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portion 22b on the inner surface.

Then, when the determination unit 14c determines that the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding units 22a, 22b can be specified by the determination unit 14c, the weld bead grinding units 22a, 22b on the outer surface and the inner surface are formed. The positions of the extra weld ends on both sides in the circumferential direction are specified, and the position data of the extra weld ends on both sides in the circumferential direction of the identified weld bead grinding portions 22a and 22b and the pipe end portion 22 calculated by the first calculating unit 14a. Based on the shapes of the outer peripheral surface and the inner peripheral surface of the welded bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S, the shape dimensions of the welded portions are calculated.

The second calculator 14b determines the circumferences of the weld bead grinding parts 22a, 22b when the determining part 14c determines that the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding parts 22a, 22b cannot be specified. The UOE steel pipe including the weld bead non-grinding portions 23a and 23b obtained from the second displacement gauges 11a and 11b, without specifying the positions of the extra weld ends on both sides in the direction, similarly to the second calculating unit 14b according to the first embodiment. The position data of the outer peripheral surface and the inner peripheral surface of S and the rotation angle data of the rotary shaft 5c (measurement arm 7) based on the predetermined position at the pipe end portion 22 of the UOE steel pipe S obtained from the rotation angle detector 6 are used. Based on the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portions 23a, 23b of the UOE steel pipe S, the positions of the extra weld end portions on both sides in the circumferential direction of the identified weld bead non-ground portions 23a, 23b are determined. Based on the position data and the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 calculated by the first calculating unit 14a, the welded portions of the weld bead grinding portions 22a, 22b at the pipe end portion 22 of the UOE steel pipe S. 21 is calculated.

Then, the calculation result of the second calculation unit 14b is output to the output unit 15.
According to the apparatus 1 for measuring the shape and dimension of the welded portion 21 of the welded pipe according to the second embodiment, the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portions 22a and 22b of the UOE steel pipe S (welded pipe to be measured) are provided. If it is possible to specify, the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portions 22a, 22b are specified. If it cannot be specified, both sides of the welding bead non-grinding portions 23a, 23b in the circumferential direction are specified. By specifying the positions of the extra weld end portions, the positions of the extra weld edge portions on both sides in the circumferential direction of the weld bead grinding portions 22a and 22b of the pipe end portion 22 including the weld bead grinding portions 22a and 22b are accurately identified. However, by doing so, it is possible to measure the shape and size of the weld portion 21 of the weld bead grinding portions 22a and 22b.

Then, when measuring the shape and dimension, similarly to the shape and dimension measuring apparatus 1 according to the first embodiment, after the UOE steel pipe S is stopped at a predetermined position, the operator inputs a signal to start measurement to the control unit 13. Only by this, it is possible to fully automatically and highly accurately measure the shape and dimension of the welded portion 21 of the weld bead grinding portions 22a and 22b in the pipe end portion 22 of the UOE steel pipe S.
The second displacement gauges 11a and 11b are provided as a pair so as to measure both the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b in which the weld beads are not ground. However, the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion 23a on the outer surface and the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion 23b on the inner surface are slightly deviated from each other. If the case is ignored, one second displacement gauge may be provided to detect the position of at least one of the outer peripheral surface and the inner peripheral surface of the UOE steel pipe S including the weld bead non-ground portions 23a and 23b.

(Third Embodiment)
Next, a shape dimension measuring device for a welded portion of a welded pipe according to a third embodiment of the present invention will be described with reference to FIG.
The shape and dimension measuring apparatus 101 of the welded portion of the welded pipe shown in FIG. 9 has the same basic configuration as the shape and dimension measuring apparatus 1 according to the first embodiment shown in FIG. 1, but the first embodiment shown in FIG. Unlike the above-described shape dimension measuring apparatus 1, the measurement head 9 is not provided with the pair of second displacement gauges 11a and 11b, and the UOE steel pipe including the weld bead non-ground portions 23a and 23b in which the weld beads are not ground. The difference is that the second displacement gauge 103 for detecting the position of the inner peripheral surface of S is attached to the rotating plate 5d of the rotating mechanism 5 by the attaching bar 102.
Here, the 2nd displacement meter 103 is arrange|positioned at the front-end|tip of the attachment bar 102 attached to the rotating plate 5d, and the distance L between the 2nd displacement meter 103 and the 1st displacement meter 10b becomes 250 mm-500 mm. Is set.

The calculation unit 14 includes a first calculation unit 14a and a second calculation unit 14b.
The 1st calculation part 14a is the same as the 1st calculation part 14a of the calculation part 14 of the shape dimension measuring device 1 which concerns on 1st Embodiment, the predetermined|prescribed in the pipe end part 22 of the UOE steel pipe S obtained from the rotation angle detector 6. Rotation angle data of the rotary shaft 5c (measurement arm 7) based on the position and the outer circumference of the pipe end portion 22 including the weld bead grinding portions 22a and 22b of the UOE steel pipe S obtained from the pair of first displacement gauges 10a and 10b. The shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 of the UOE steel pipe S are calculated based on the position data of the surface and the inner peripheral surface. Here, the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion 22 are similar to those described above, and the outer surface radius and the pipe of the outer peripheral surface of the pipe end portion 22 with reference to a predetermined position in the pipe end portion 22 of the UOE steel pipe S. It is the inner surface radius of the inner peripheral surface of the end portion 22.

Further, the second calculator 14b differs from the second calculator 14b of the calculator 14 of the shape dimension measuring apparatus 1 according to the first embodiment in that the welding bead non-grinding parts 23a and 23b obtained from the second displacement meter 103 are provided. Based on the position data of the inner peripheral surface of the UOE steel pipe S including and the rotation angle data of the rotary shaft 5c based on the predetermined position at the pipe end portion 22 of the UOE steel pipe S obtained from the rotation angle detector 6, the UOE steel pipe The positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portion 23b only on the inner surface of S are specified.
In addition, the second calculating unit 14b uses position data of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion 23b having only the specified inner surface, and the outer peripheral surface of the pipe end portion 22 calculated by the first calculating unit 14a. And the shape of the inner peripheral surface, the geometrical dimensions of the welded portions 21 of the weld bead grinding portions 22a and 22b on the outer surface and the inner surface of the pipe end portion 22 of the UOE steel pipe S are calculated.

According to the shape/dimension measuring apparatus 1 for the welded portion 21 of the welded pipe according to the third embodiment, the extra welded end portions on both sides in the circumferential direction of the weld bead non-ground portion 23b only on the inner surface of the UOE steel pipe S (welded pipe to be measured). By specifying the position of the weld bead, the weld bead is ground, and the weld bead grinded portion 22a of the pipe end 22 including the weld bead grinded portions 22a and 22b of the outer surface and the inner surface in which the boundary between the welded portion and the base metal portion is unclear, The positions of the extra weld end portions on both sides in the circumferential direction of the welded portion 21 of 22b can be accurately specified, and thus the shape and size of the welded portion 21 of the weld bead grinding portions 22a and 22b can be measured.
Then, in measuring the shape and dimension, as described above, after the UOE steel pipe S is stopped at a predetermined position, the operator simply inputs a measurement start signal to the control unit 13, and the pipe end portion of the UOE steel pipe S The shape and size of the welded portion 21 of the weld bead grinding portions 22a and 22b in 22 can be measured fully automatically with high accuracy.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, the shape dimensions of the weld bead grinding portions 22a and 22b at the pipe end portion 22 of the UOE steel pipe S measured by the shape dimension measuring device 1 of the present invention are the outer surface peaking value, the outer surface offset value, and the outer surface bead height. , Inner peaking value, inner surface offset value, and inner bead height are not all measured, but outer surface peaking value, outer surface offset value, outer bead height, inner peaking value, inner surface offset value, and inner bead height Either one of them may be measured, or any combination of two or more may be measured.

DESCRIPTION OF SYMBOLS 1 Shape measurement device 2 Measuring carriage 3 Traveling rail 4 Rotating mechanism lifting mechanism 4a Standing part 4b Ball screw shaft 4c Nut member 4d Motor 5 Rotating mechanism 5a Base part 5b Drive motor 5c Rotating shaft 5d Rotating plate 6 Rotation angle detector 7 Measuring arm 8 Radial moving mechanism 8a Ball screw shaft 8b Nut member 8c Motor 9 Measuring heads 10a, 10b First displacement gauge 11a, 11b Second displacement gauge 12a Displacement gauge mounting bar for outer circumference 12b Displacement gauge mounting bar for inner circumference 13 Control Part 14 Calculation part 14a 1st calculation part 14b 2nd calculation part 14c Judgment part 15 Output part 21 Welding part 22 Pipe end part 22a, 22b Weld bead grinding part 23a, 23b Weld bead non-grinding part 24 Pipe end face 101 Shape measurement device 102 Mounting bar 103 Second displacement gauge C1 Center axis of UOE pipe C2 Rotation axis center axis C3 Center line between a pair of first displacement gauges and between a pair of second displacement gauges S UOE steel pipe (weld pipe to be measured)

Claims (7)

A rotating mechanism that is attached to a measuring carriage that is movable in the pipe axis direction of the welded pipe to be measured so as to move up and down, and that has a rotating shaft that is rotatable about an axis substantially the same as the central axis of the welded pipe to be measured; A measurement arm attached to a rotation shaft of a rotating mechanism and rotating together with the rotation shaft, and a measurement arm that is movably attached to the measurement arm in a radial direction of the measured welded pipe, and a welding bead of the measured welded pipe is ground. Of a measured welded pipe including a pair of first displacement gauges for detecting the positions of the outer peripheral surface and the inner peripheral surface of the pipe end portion including the welded bead grinding portion and the weld bead non-ground portion where the weld bead is not ground A measuring head provided with a second displacement gauge for detecting the position of at least one of an outer peripheral surface and an inner peripheral surface, a moving operation of the measuring carriage, a rotating operation of a rotating shaft of the rotating mechanism, a lifting operation of the rotating mechanism, and the A control unit that controls the radial movement operation of the measurement head, a rotation angle detector that detects the rotation angle of the rotating shaft of the rotating mechanism, and a welding unit of the welding bead grinding unit at the pipe end of the measured welded pipe. Equipped with a calculation unit for calculating the shape dimension,
The calculation unit includes rotation angle data of the rotation shaft obtained from the rotation angle detector, and an outer peripheral surface of a pipe end portion including a weld bead grinding unit of the measured welded pipe obtained from the pair of first displacement meters. And a first calculator that calculates the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion of the welded pipe to be measured based on the position data of the inner peripheral surface and the weld bead non-obtained from the second displacement gauge. Based on the position data of at least one of the outer peripheral surface and the inner peripheral surface of the measured welded pipe including the grinding portion, and the rotation angle data of the rotating shaft obtained from the rotation angle detector, the welding of the measured welded pipe is performed. The positions of the extra embankment ends on both sides in the circumferential direction of the bead non-grinding portion are specified, and the position data of the extra embossment ends on both sides in the circumferential direction of the weld bead non-grinding portion that have been specified are calculated by the first calculator A second calculation unit for calculating the shape and size of the welded portion of the weld bead grinding portion at the pipe end portion of the welded pipe to be measured, based on the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion. An apparatus for measuring the shape and size of a welded part of a welded pipe. A pair of the second displacement gauges are provided to detect the positions of both the outer peripheral surface and the inner peripheral surface of the measured welded pipe including the weld bead non-ground portion,
The second calculator is obtained from the rotation angle detector and position data of both the outer peripheral surface and the inner peripheral surface of the welded pipe to be measured including the weld bead non-ground portion obtained from the pair of second displacement gauges. The positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portion of the welded pipe to be measured are specified based on the rotation angle data of the rotary shaft. Weld shape measurement device. A rotating mechanism that is attached to a measuring carriage that is movable in the pipe axis direction of the welded pipe to be measured so as to move up and down, and that has a rotating shaft that is rotatable about an axis substantially the same as the central axis of the welded pipe to be measured; A measurement arm attached to a rotation shaft of a rotating mechanism and rotating together with the rotation shaft, and a measurement arm that is movably attached to the measurement arm in a radial direction of the measured welded pipe, and a welding bead of the measured welded pipe is ground. Of a measured welded pipe including a pair of first displacement gauges for detecting the positions of the outer peripheral surface and the inner peripheral surface of the pipe end portion including the welded bead grinding portion and the weld bead non-ground portion where the weld bead is not ground A measuring head provided with a second displacement gauge for detecting the position of at least one of an outer peripheral surface and an inner peripheral surface, a moving operation of the measuring carriage, a rotating operation of a rotating shaft of the rotating mechanism, a lifting operation of the rotating mechanism, and the A control unit that controls the radial movement operation of the measurement head, a rotation angle detector that detects the rotation angle of the rotating shaft of the rotating mechanism, and a welding unit of the welding bead grinding unit at the pipe end of the measured welded pipe. Equipped with a calculation unit for calculating the shape dimension,
The calculation unit includes rotation angle data of the rotation shaft obtained from the rotation angle detector, and an outer peripheral surface of a pipe end portion including a weld bead grinding unit of the measured welded pipe obtained from the pair of first displacement meters. And a first calculation unit that calculates the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion of the welded pipe to be measured based on the position data of the inner peripheral surface, and the pipe calculated by the first calculation unit. Based on the shapes of the outer peripheral surface and the inner peripheral surface of the end portion, a determining unit that determines whether the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead grinding portion can be specified, and the extra weld end portion by the determining unit. When it is determined that the position can be specified, the positions of the extra weld ends on both sides in the circumferential direction of the weld bead grinding portion are specified, and the position data of the extra weld ends on the both sides in the circumferential direction of the specified weld bead grinding portion are specified. Calculating the shape and size of the weld portion of the weld bead grinding portion at the pipe end portion of the measured welded pipe, based on the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion calculated by the first calculating portion And a second calculating unit for measuring the shape and dimension of the welded portion of the welded pipe. When it is determined by the determination unit that the positions of the extra weld edges on both sides in the circumferential direction of the weld bead grinding portion cannot be specified, the second calculator calculates the extra weld edges on both sides in the circumferential direction of the weld bead grinding portion. Position data of at least one of the outer peripheral surface and the inner peripheral surface of the welded pipe to be measured including the weld bead non-grinding portion obtained from the second displacement meter without specifying the position, and the rotation angle detector Based on the rotation angle data of the rotating shaft, while specifying the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-grinding portion of the measured welded pipe, the circumferential direction of the identified weld bead non-grinding portion Based on the position data of the extra weld ends on both sides and the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion calculated by the first calculating portion, the weld bead grinding portion at the pipe end portion of the welded pipe under test is measured. The shape dimension of the welded portion of the welded pipe according to claim 3, wherein the shape dimension of the welded portion is calculated. A pair of the second displacement gauges are provided to detect the positions of both the outer peripheral surface and the inner peripheral surface of the measured welded pipe including the weld bead non-ground portion,
The second calculator is obtained from the rotation angle detector and position data of both the outer peripheral surface and the inner peripheral surface of the welded pipe to be measured including the weld bead non-ground portion obtained from the pair of second displacement gauges. The welded pipe according to claim 4, wherein the positions of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portion of the measured welded pipe are specified based on the rotation angle data of the rotary shaft. Weld shape measurement device. A rotating mechanism that is attached to a measuring carriage that is movable in the pipe axis direction of the welded pipe to be measured so as to move up and down, and that has a rotating shaft that is rotatable about an axis substantially the same as the central axis of the welded pipe to be measured; A measurement arm attached to a rotation shaft of a rotating mechanism and rotating together with the rotation shaft, and a measurement arm that is movably attached to the measurement arm in a radial direction of the measured welded pipe, and a welding bead of the measured welded pipe is ground. Measuring head equipped with a pair of first displacement gauges for detecting the positions of the outer peripheral surface and the inner peripheral surface of the pipe end including the welded bead grinding portion, and the rotary head attached to the rotary shaft of the rotating mechanism together with the rotary shaft. A second displacement meter that rotates and detects the position of the inner peripheral surface of the welded pipe to be measured including a weld bead non-ground portion in which the weld bead is not ground; a moving operation of the measuring carriage; and a rotating shaft of the rotating mechanism. Of the rotating mechanism, the lifting operation of the rotating mechanism and the radial movement operation of the measuring head, a rotation angle detector for detecting the rotation angle of the rotating shaft of the rotating mechanism, And a calculation unit for calculating the shape and size of the welded portion of the weld bead grinding portion at the pipe end,
The calculation unit includes rotation angle data of the rotation shaft obtained from the rotation angle detector, and an outer peripheral surface of a pipe end portion including a weld bead grinding unit of the measured welded pipe obtained from the pair of first displacement meters. And a first calculator that calculates the shapes of the outer peripheral surface and the inner peripheral surface of the pipe end portion of the welded pipe to be measured based on the position data of the inner peripheral surface and the weld bead non-obtained from the second displacement gauge. Based on the position data of the inner peripheral surface of the welded pipe to be measured including the grinding portion and the rotation angle data of the rotating shaft obtained from the rotation angle detector, the welding bead non-grinding only on the inner surface of the welded pipe to be measured. The positions of the extra weld end portions on both sides in the circumferential direction of the portion are specified, and the position data of the extra weld end portions on both sides in the circumferential direction of the weld bead non-ground portion of only the specified inner surface and the position calculated by the first calculation unit are calculated. Based on the outer peripheral surface and the inner peripheral surface shape of the pipe end portion, the welded portion of the welded pipe is characterized in that the welded portion of the weld bead grinding portion at the pipe end portion of the measured welded pipe is calculated. Shape measuring device. The shape of the welded portion of the weld bead grinding portion at the pipe end portion of the measurement welded pipe is one of the outer surface peaking value, the outer surface offset value, the outer surface bead height, the inner surface peaking value, the inner surface offset value, and the inner surface bead height. 7. The apparatus for measuring the shape and size of a welded portion of a welded pipe according to claim 1, further comprising one.

Images