JP3390748B2 - Ultrasonic flaw detector for turbine rotor blade implanted part and flaw detection method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly accurate nondestructive inspection device capable of detecting defects existing inside a metal.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 20 and 21, in a low-pressure turbine device such as a thermal power plant, a blade plant for mounting turbine blades 3 around a substantially disk-shaped turbine rotor 1. A recess 2 is provided.

First to third dovetail portions 4 to 6 are formed on the blade implanting portion 2 so as to project from the tip edge at a predetermined interval, and the first to third dovetail portions 4 to 6 are formed. The base end portion 3a of the turbine blade 3 is engaged with.

In the blade implanting portion 2 thus constructed, cracks may occur during operation due to corrosion fatigue and stress corrosion cracking (SCC).

Therefore, the operation of the turbine rotor 1 is periodically stopped, and as shown in FIGS. 22 to 24, the flaw detection is performed by using the ultrasonic flaw detector 7 of the turbine rotor blade implantation section. There is.

The ultrasonic flaw detector 7 for the turbine rotor blade implanting section 7 mainly transmits an ultrasonic wave to the blade implanting section 2 and an ultrasonic wave transmitting section 9 for transmitting the ultrasonic waves. There is provided a probe 8 as an ultrasonic probe having an ultrasonic wave receiving unit 10 for receiving an ultrasonic wave echo.

Further, in the ultrasonic flaw detector 7 of the turbine rotor blade implanting portion, the echo received by the ultrasonic receiver 10 is converted into a visible state and the screen 11a of the monitor device 11 as a display portion is displayed. An image processing device 12 is provided as an image processing unit to be displayed above.

Next, the operation of the conventional ultrasonic flaw detector 7 for a turbine rotor blade implantation section will be described.

In the conventional turbine rotor blade implanting portion ultrasonic flaw detector 7 constructed as described above, first, the probe 8 is positioned on the side surface 1a of the turbine rotor 1 and the blade implanting portion 2 is positioned. At a shallow incident angle θ (θ = about 20 degrees) toward the first dovetail portion 4 located near the tip of the ultrasonic wave, ultrasonic waves are transmitted from the ultrasonic wave transmitting portion 9 and echoes (reflected waves) are transmitted. The sound wave receiving unit 10 receives the sound wave.

The received echo is the image processing device 1
2 is converted into a visible state as shown in FIG. 23 or FIG. 24, and so-called A is displayed on the screen 11 a of the monitor device 11.
It is displayed as a scope image.

On the screen of the monitor device 11, first, an ultrasonic wave is incident on the notch groove 4a provided in advance, and an initial value is set so that the height of the echo 13 becomes about 80% as shown in FIG. To be done.

Next, the inspection of the inspection object is actually performed,
The echo intensity in the beam path is visually recognized on the screen 11a, which is a so-called A scope, and the defect portion is inspected.

FIGS. 25 to 29 show another ultrasonic flaw detector 14 for turbine blade impregnation of the turbine rotor, which is a so-called pitch catch method.

First, the structure will be described. In this turbine rotor blade-implanted portion ultrasonic flaw detector 14, a probe as an ultrasonic probe is used in the same manner as the turbine rotor blade-implanted portion ultrasonic flaw detector 7. Ultrasonic transmitter 9a, 9 constituting
b and the ultrasonic wave receiving portions 10a and 10b are individually provided in two sets on both side surfaces 1a and 1b of the blade implanting portion 2 of the turbine rotor 1.
It is provided on the side.

As shown in FIG. 26, each of the ultrasonic wave transmitting portions 9a and 9b injects an ultrasonic wave at a predetermined angle α (α = about 30 degrees) with respect to the radial direction r of the turbine rotor 1. Is configured to.

Further, as shown in FIG. 25, the incident angle θ with respect to the first dovetail portion 4 is shallow (θ = about 20 degrees) as in the prior art example, and the ultrasonic waves are emitted from the ultrasonic wave transmitting portions 9a and 9b. The so-called four-channel pitch catch method is adopted in which the ultrasonic waves are received by the ultrasonic wave receiving portions 10a and 10b provided on the opposite side surface of the turbine rotor 1.

Next, the operation of the other conventional ultrasonic flaw detector 14 for turbine blade impregnation part will be described.

In another turbine rotor blade implanting portion ultrasonic flaw detector 14 constructed in this manner, for example, the ultrasonic waves emitted from the ultrasonic wave transmitting portion 9a are reflected by the blade implanting portion 2 and are transferred to the turbine. The ultrasonic wave received by the ultrasonic wave receiving portion 10a provided on the opposite side surface of the rotor 1 and emitted from the ultrasonic wave transmitting portion 9b is reflected by the blade implanting portion 2 and is on the opposite side of the turbine rotor 1. It is received by the ultrasonic wave receiving unit 10b provided on the side surface.

Also, for example, the ultrasonic wave emitted from the ultrasonic wave transmitting section 9a is reflected by the blade implanting section 2 and is provided on the opposite side surface of the turbine rotor 1 to the ultrasonic wave receiving section 10b.
May be received by the ultrasonic transmitter 9b as well.
The ultrasonic waves emitted from the above may be reflected by the blade implanting section 2 and received by the ultrasonic receiving section 10a provided on the opposite side surface of the turbine rotor 1.

When scanning is performed along the rotation direction of the turbine rotor 1 shown by the white arrow in FIGS. 26 and 27, as shown in FIG. 28, a so-called B-scope image (scanning direction, ultrasonic path is taken on two axes). It is obtained in a two-dimensionally visible state as a map diagram).

In the ultrasonic flaw detector 14 of this turbine rotor blade implanting section, the ultrasonic waves emitted from the ultrasonic wave transmitting sections 9a and 9b at a predetermined angle α are reflected at the defective portion and the turbine is The ultrasonic waves are received by the ultrasonic wave receiving units 10a and 10b provided on the opposite side surface of the rotor 1.

Therefore, the rust adhering to the surface of the blade implanting portion 2 is lightly displayed in a horizontal stripe pattern in the scanning direction on the screen 14a, and as shown in FIG. 28, vertical stripes are formed in the scanning direction. It is distinguished from the image of the defect portion clearly displayed in the pattern. Therefore, it is possible to easily discriminate between the defective portion and the rust.

Incidentally, as other ultrasonic flaw detectors of this type of turbine rotor blade implantation section, Japanese Patent Laid-Open No. 7-244024, Japanese Patent Laid-Open No. 61-240159, and Japanese Patent Laid-Open No. 2-4 are available.
Those described in Japanese Patent No. 4245, Japanese Patent Laid-Open No. 2-242148, Japanese Patent Laid-Open No. 4-16758, Japanese Patent Laid-Open No. 4-274754, Japanese Patent Laid-Open No. 5-288723 and the like are known.

[0024]

However, in the conventional ultrasonic flaw detector for turbine rotor blades as shown in FIGS. 22 to 24, the notch groove 4a is almost the same as the echo 13 shown in FIG. When a strong echo with an echo height of about 80% is visually recognized, it can be judged as a defect, but at a low echo height of 10% or less, it is a defect,
It is difficult to judge whether it is rust or a pit (small hole) on the surface of the first dovetail portion 4. In such a case, the turbine blades 3 must be removed from the turbine rotor 1 and visually inspected. .

When the turbine blades 3 are removed from the turbine rotor 1 and visually inspected as described above, inspection time and inspection cost increase.

In the turbine rotor blade implanting portion ultrasonic flaw detector 14 shown in FIGS. 25 to 27, the rust echo and the defect echo such as a crack can be easily discriminated. The ultrasonic path is long, the incident angle θ to the first dovetail portion 4 is shallow (θ = about 20 degrees) as in the conventional example, and the resolution is low.

For example, as shown in FIG. 29 (a), both hooks of the first dovetail portion 4 are penetrated, and FIG. 29 (b).
As in the state in which the first dovetail portion 4 penetrates the one hook as shown in (c), it is possible to detect a loss with a width w of about w = about 10 mm, but a small loss as shown in (d) of FIG. Two
A crack 15 or the like formed along the radial direction of the turbine rotor 1 at the hook root on one side of the first dovetail portion 4 as shown in 9 (e) is difficult to determine because the projected area is small.

Therefore, an object of the present invention is to solve the above-mentioned problems, to easily distinguish between rust and the like, and to maintain the maintainability and accuracy of the turbine rotor blade implanting part ultrasonic flaw detector and the ultrasonic flaw detector. It is to provide a flaw detection method using the device.

[0029]

In order to solve the above problems, according to the invention described in claim 1, an ultrasonic wave for transmitting an ultrasonic wave to a blade-implanted portion of a turbine rotor on which a turbine blade is mounted. An ultrasonic probe having a transmitter and an ultrasonic receiver that receives the echo of the ultrasonic waves transmitted from the ultrasonic transmitter, and the echo received by the ultrasonic receiver is converted to a visible state. In a turbine rotor blade implanting section ultrasonic flaw detector having an image processing section for displaying on the display section,
Wherein a direction of echoes reflected to the direction of the ultrasonic wave transmitted from the ultrasonic transmitting portion, the match with the radial direction of the turbine rotor, the ultrasonic wave and transmitted from the ultrasonic transmitting unit
The wing by directing it toward the side surface on the opposite side of the wing implantation section.
The opposite side to the inspected part near the tip edge of the implant part
Wherein with placing an ultrasonic probe to direct ultrasonic waves are reflected by the side surface, subjected to scanning by relative movement and along said ultrasonic feeler element in a circumferential direction of the turbine rotor, the image processing In the section, a turbine rotor blade plant configured to display a flaw detection image in a two-dimensional manner by setting a coordinate axis of an ultrasonic path length in a direction orthogonal to a coordinate axis in a scanning direction on a display screen of the display unit. It features an ultrasonic ultrasonic flaw detector.

According to the first aspect of the present invention configured as above, the direction of the ultrasonic wave transmitted from the ultrasonic probe and the direction of the reflected echo of the ultrasonic probe of the turbine rotor Since it coincides with the radial direction, the distance to the flaw-detected portion is short, and the ultrasonic wave is transmitted in a shorter path as compared with the ultrasonic wave that is irradiated with a predetermined angle α as in the conventional case. The ultrasonic waves transmitted from the part are reflected by the defective part and return to the ultrasonic wave receiving part in the shortest distance.

In the image processing section, the echo received by the ultrasonic receiving section is converted into a visible state and displayed on the display section.

In the two-dimensional flaw detection image displayed on the display screen of the display unit, the rust adhering to the surface of the blade-implanted portion runs along the circumferential direction of the turbine rotor along with the ultrasonic probe. Since they are moved relative to each other for scanning, a horizontal striped pattern is displayed in the scanning direction.

Since the defective portion is located inside the surface of the blade-implanted portion and is formed so as to be short in the scanning direction, the defective portion is uneven at a position deviated from the horizontal stripe pattern. Partial echo is displayed.

Therefore, it is easy to distinguish between the rust and the defects and it is not necessary to remove the turbine blades from the turbine rotor and visually inspect during the inspection, and the maintainability is good.

Further, the present invention according to claim 2, wherein the ultrasonic probe is arranged on one side surface of the turbine rotor
Are, moreover, are characterized with respect to the flaw portion, the turbine rotor blade implanting portion ultrasonic testing apparatus as claimed in claim 1, wherein that sets the ultrasonic wave emitting angle projected area increases.

Here, for example , the set ultrasonic wave transmission angle is an angle of about 45 degrees from the vertical direction of one side surface.

The intended constructed according to claim 2, wherein in this way, the setting of ultrasonic wave transmission angle degrees, with respect to the flaw portion, the projected area increases.

Therefore, the ultrasonic wave transmitted from the ultrasonic wave transmitting section in a shorter distance is further reflected at the defective portion,
While returning to the ultrasonic wave receiving unit at the shortest distance, the size of the flaw detection portion displayed on the display unit is large and easy to visually recognize.

Then, according to the third aspect,
By directing the ultrasonic wave transmitting direction of the ultrasonic wave transmitting portion to the side surface on the opposite side of the blade implanting portion, the portion to be inspected in the vicinity of the tip edge of the blade implanting portion is reflected once on the opposite side surface. The ultrasonic flaw detector of the turbine rotor blade implanting part according to claim 1 or 2, which applies reflected ultrasonic waves.

According to the third aspect of the present invention configured in this way, the portion to be inspected in the vicinity of the tip edge of the blade implanting portion is separated from the ultrasonic wave transmitting portion, for example, the blade implant of the turbine rotor. Even in the vicinity of the tip of the recess, the reflected ultrasonic wave reflected once by the side surface on the opposite side is applied, so that the defective portion formed along the radial direction of the turbine rotor can be captured with a large projected area. .

Further, according to the fourth aspect, by directing the ultrasonic wave transmitting direction of the ultrasonic wave transmitting portion to the side surface on the side opposite to the blade implanting portion, the covering in the vicinity of the tip edge of the blade implanting portion is performed. The ultrasonic flaw detector of claim 1 or 2 is characterized in that a reflected ultrasonic wave reflected a plurality of times by a side surface including the opposite side surface is applied to the inspection site.

According to the present invention having the above-mentioned structure, since the reflected ultrasonic waves reflected by the side surfaces including the opposite side surface a plurality of times are applied to the inspected part, the ultrasonic probe is applied to the inspected part. Even a flaw detection with a shape that cannot bring the tentacles close to each other can be detected with a large projected area.

[0043] Also, those described in claim 5, and arranged side of the ultrasonic wave transmitting unit ultrasonic wave transmission direction of the ultrasonic <br/> wave transmission unit, by directing the side surface of the opposite side also directly to the examination site of said opposite side surface near, and wherein the turbine rotor blade implanting portion ultrasonic inspection apparatus according to claim 1 or 2, wherein applying the ultrasound.

According to the present invention having the above structure, the portion to be inspected near the side surface on the side opposite to the ultrasonic wave transmitting portion.
Also directly, because ultrasound is hit, further a short journey,
The defective portion can be captured accurately.

Then, according to the sixth aspect,
The ultrasonic probe includes a tip portion ultrasonic probe for flaw detection on a portion to be inspected in the vicinity of the tip edge of the blade implantation portion, and a near portion ultrasonic probe for flaw detection on an portion to be inspected on the side surface on the opposite side. 6. A total of four of the tip portion ultrasonic probe and the adjacent portion ultrasonic probe are arranged on one side surface of the turbine rotor. It features an ultrasonic flaw detector for the turbine rotor blade implantation section.

According to the sixth aspect of the present invention configured as above, since a total of four ultrasonic probes are arranged on one side surface of the turbine rotor, for example, the incident angles are detected differently for detection. As a result, it is possible to detect a defective portion that is difficult to detect with a single ultrasonic probe, and it is possible to perform flaw detection with better accuracy.

According to a seventh aspect of the present invention, the ultrasonic probe includes a tip portion ultrasonic probe for flaw detection of a portion to be inspected in the vicinity of the tip edge of the blade implantation portion, and the opposite side. And a near-site ultrasonic probe for flaw-detecting a site to be inspected near the side surface, and the tip-side ultrasonic probe and the near-site ultrasonic probe are provided on both side surfaces of the turbine rotor, respectively. The turbine rotor blade implanting part ultrasonic flaw detector according to any one of claims 1 to 5, wherein four of them are arranged.

According to the seventh aspect of the present invention configured in this way, since both sides of the blade implanting portion of the turbine rotor can be inspected at the same time, the inspection time can be shortened and an increase in inspection cost can be suppressed. it can.

Further, in the eighth aspect, the ultrasonic probe is provided with radial position adjusting means for adjusting the radial position of the turbine rotor. One of the features is the ultrasonic flaw detector of the turbine rotor blade implantation section.

According to the eighth aspect of the present invention configured as above, the radial position of the ultrasonic probe is adjusted by the radial position adjusting means.

Therefore, the ultrasonic probe can be positioned at a radial position where the defective portion can be more accurately captured, and flaw detection can be performed with good accuracy.

According to a ninth aspect of the present invention, the ultrasonic probe is provided with angle adjusting means capable of adjusting the ultrasonic wave transmission angle. A turbine rotor blade implanting part ultrasonic flaw detector according to one aspect is characterized.

According to the ninth aspect of the present invention having such a configuration, the angle of the ultrasonic wave transmitted from the ultrasonic probe can be adjusted by the angle adjusting means.

Therefore, it is possible to perform flaw detection with good accuracy by pointing the ultrasonic probe at an angle at which the defective portion can be more accurately captured.

According to the tenth aspect,
An ultrasonic wave transmitting section for transmitting ultrasonic waves to an impeller section of a turbine rotor equipped with turbine blades, and an ultrasonic wave receiving section for receiving echoes of ultrasonic waves transmitted from the ultrasonic wave transmitting section. An ultrasonic flaw detector for a turbine rotor blade implanting section, comprising: an ultrasonic probe; and an image processing unit for converting an echo received by the ultrasonic receiving unit into a visible state and displaying the echo on a display unit. The ultrasonic transmitter of the ultrasonic probe
Direct the transmitted ultrasonic waves to the side opposite to the wing implant.
To the inspected part near the tip edge of the blade implantation part.
Then, the ultrasonic waves reflected on the opposite side surface are projected large
It is common to set the ultrasonic wave transmission angle so that the area is hit.
In addition, the ultrasonic wave receiving portion is arranged at a position different from the ultrasonic wave transmitting portion in the circumferential direction of the turbine rotor, and the ultrasonic probe is relatively moved along the circumferential direction of the turbine rotor. A turbine configured to perform scanning and to display a flaw detection image in a two-dimensional manner by setting a coordinate axis of a path length of an ultrasonic wave in a direction orthogonal to a coordinate axis of a scanning direction on the display screen of the display unit in the image processing unit. It features an ultrasonic flaw detector for the rotor blade implantation part.

According to the tenth aspect of the present invention configured as above, the ultrasonic wave transmitted from the ultrasonic wave transmitting portion of the ultrasonic probe is reflected at the flaw-detected portion, and the ultrasonic wave is generated in the circumferential direction of the turbine rotor. The signals are received by the ultrasonic receiving units arranged at different positions.

Therefore, it is not necessary to accurately grasp the shape of the portion to be flaw-detected in advance, and flaw detection can be easily performed.

According to the eleventh aspect, the blade-implanting portion of the blade-implanting portion having a protruding shape protruding from one side surface of the blade-implanting portion of the turbine rotor to the lateral side has a superposition of the blade-implanting portion. in flaw detection method using the ultrasonic flaw detector, before Kitsubasa implanting portion
On the other side surface of the opposite side of the root portion, while transmitting ultrasonic waves from the ultrasonic wave transmitting portion, by reflecting a plurality of times in the blade implantation portion located on the back side of the root portion of the blade implantation portion, The flaw detection method using the ultrasonic flaw detector of the turbine rotor blade implanting part according to any one of claims 1 to 10 for flaw detection by wrapping the ultrasonic wave around the flaw-detected portion. .

According to the eleventh aspect of the present invention configured as above, since the ultrasonic waves wrap around from the back side of the flaw-detected portion to perform flaw detection, there is no sidewall or the like behind the flaw-detected portion. , The defect can be grasped accurately.

According to the twelfth aspect,
The ultrasonic wave transmission angle direction of the ultrasonic probe is set so that the projected area is large with respect to the portion to be inspected, and the ultrasonic probe is moved relatively along the circumferential direction of the turbine rotor. By performing the scanning, the image processing unit sets the coordinate axis of the ultrasonic path length in a direction orthogonal to the coordinate axis of the scanning direction on the display screen of the display unit to display the flaw detection image two-dimensionally. flaw detection method using the turbine rotor blade implanting portion ultrasonic testing apparatus any one SL mounting of claim 1 1 0 is characterized in.

According to the twelfth aspect of the present invention configured as above, when the flaw detection image is displayed two-dimensionally, the coordinate axis of the ultrasonic path is set in a direction orthogonal to the coordinate axis of the scanning direction. Therefore, rust or the like generated on the surface of the turbine rotor overlaps with the surface of the turbine rotor detected in the same path and is difficult to see.

However, a defect which is generated in a part of the flaw-detected portion apart from the surface layer is visually recognized in a path length different from the surface of the turbine rotor and in a part of the scanning direction different from other portions. It

Therefore, when there is a defect in the turbine rotor, it can be easily distinguished from the one without defect, and the rust and the like can be easily distinguished from the defect . Further, according to claim 13,
The turbine rotor from the radial direction,
Irradiate ultrasonic waves by shaking the irradiation direction in the scanning direction within the touch panel surface.
The turbine rotor according to any one of claims 1 to 9.
It features an ultrasonic flaw detector for the blade implantation section.

[0064]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 of the present invention will be described below with reference to the drawings.

1 to 9 show the first embodiment of the present invention.
2 shows an ultrasonic flaw detector for a turbine rotor blade implanting part. It should be noted that the same or equivalent parts as those of the conventional example will be described with the same reference numerals.

First, the structure will be described. The turbine rotor blade implanting portion ultrasonic flaw detector of the first embodiment is, as shown in FIG. 2, a bogie 1 having rollable wheels 16 and 16.
7, a lift device 18 is provided, and the carriage 17
The arm portion 19 extending laterally from the side for a predetermined length is supported so as to be able to move up and down.

A guide bracket 20 having guide rollers 20a, 20a rotatably provided on the outer peripheral surface of the turbine rotor rotating shaft 1c of the turbine rotor 1 is attached to the tip of the arm portion 19.

Further, a motor bracket 21 is provided on the arm portion 19 so as to be separated from the guide bracket 20 by a predetermined distance.
, And a motor bracket 21, a ball screw 23 as a radial position adjusting means is rotatably provided.

The ball screw 23 has a substantially rectangular plate-like shape so as to be positioned on one side surface 1a of the turbine rotor 1.
The ch probe holder 22 is screwed.

The ball screw 23 is rotationally driven by a holder drive motor 24 fixed to the motor bracket 21, and the motor bracket 2
The number of rotations of the ball screw 23 is counted by the position determination encoder 25 fixed to 1, and the position of the 4ch probe holder 22 in the extending direction of the ball screw 23 is
It is configured to be measured.

In addition, the 4ch probe holder 22 has an ultrasonic wave transmitting section for transmitting and receiving ultrasonic waves to and from the flaw-detected section in the vicinity of the second dovetail section 5 of the blade implantation section 2. A first probe 27 as a receiving unit, and an ultrasonic transmitting unit and an ultrasonic receiving unit for transmitting and receiving ultrasonic waves to a flaw-detected portion in the vicinity of the first dovetail portion 4 of the blade implantation unit 2. 2 probes 28 are provided.

In the first embodiment, as shown in FIG. 9, the first and second probes 27 and 28 are offset forward and backward with respect to the radial direction F, so that the first and second probes 27 and 28 are offset from each other. The directions L1 and L2 of the ultrasonic waves transmitted from the two probes 27 and 28 are configured to match the radial direction F of the turbine rotor 1, and the echoes reflected are reflected by the first and second probes 27 and 28. Direction L3 toward 28
L4 and the radial direction F of the turbine rotor 1 are configured to coincide with each other.

Further, the ultrasonic wave irradiation direction of the first probe 27 is about 45 degrees as shown by the solid line in FIG. 1, and is directed to the opposite side surface 2a in the vicinity of the second dovetail portion 5.

Further, the 4ch probe holder 22 has a third probe 29 as an ultrasonic wave transmitting section for transmitting an ultrasonic wave to the blade implanting section 2, and this third probe 2
The fourth probe 30 is provided as an ultrasonic wave receiving unit for receiving the echo of the ultrasonic wave transmitted from the antenna 9.

In the first embodiment, as shown in FIG. 8, by directing the ultrasonic wave transmitting direction of the third probe 29 to the side surface 36 on the opposite side of the blade implanting section 2, the blade implanting section 2 is described. First dovetail portion 4 of the inspected portion 3 near the tip edge
A predetermined angle is given to the ultrasonic wave transmission direction so that the reflected ultrasonic wave reflected by the side surface including the opposite side surface 36 a plurality of times is applied to 7.

The fourth probe 30 provided on the same side of the third probe 29 as the third probe 2 receives the reflected wave of the ultrasonic wave at the inspected site.
9 and at different positions in the circumferential direction are separated by a predetermined distance W1, by directing reception surface on the opposite side surface 36 of the blade implanting portion 2, at the examination site 37 as shown in FIG. 9, the anti shines The reflected ultrasonic waves are configured to be receivable.

Furthermore, each of these first, second and fourth probes 2
An image processing device 31 as an image processing unit mounted on the carriage 17 is connected to 7, 28 and 30. In the image processing device 31, the first, second and fourth probes 27,
The echoes received at 28 and 30 are converted into a visible state and displayed on the monitor device 11 as a display unit.

Next, the operation of the first embodiment will be described.

In the ultrasonic flaw detector of the turbine rotor blade-implanted portion according to the first embodiment, first, in order to detect a defect near the first dovetail portion 4, as shown in FIG. 4ch probe holder in which the first and second probes 27 and 28 and the third and fourth probes 29 and 30 are provided on the one side surface 1a side along the extending direction of the arm portion 19 in the radial direction F. Position 22.

The ultrasonic wave irradiation direction of the first probe 27 is about 45 degrees as shown by the alternate long and short dash line in FIG. The defective portion 35 of is detected.

The ultrasonic wave irradiation direction of the second probe 28 is about 45 degrees as shown by the chain double-dashed line in FIG. 1, and the ultrasonic wave is directed toward the opposite side surface 2a in the vicinity of the second dovetail portion 5, thereby With the ultrasonic wave reflected once on the opposite side surface 2a,
The defect portion 32 near the first dovetail portion 4 is flaw-detected.

The first probe 27 and the second probe 2
Since the directions of the ultrasonic waves L1 and L2 transmitted from 8 and the directions of the reflected echoes L3 and L4 coincide with the radial direction F of the turbine rotor 1 as shown in FIG. 3 and FIG. The distance to the flaw detection portion is short, and the first probe 27 and the second probe 27 have a short distance as compared with the ultrasonic waves emitted by being given a predetermined angle α as in the conventional case shown in FIG. The ultrasonic waves transmitted from 28 are reflected by the defective portions 35 and 32 and return to the first probe 27 and the second probe 28.

The first probe 27 and the second probe 2
Since the direction of the echo reflected by 8 and returning also matches the radial direction F of the turbine rotor 1, the echo can be received at the shortest distance.

In the image processing device 31, as shown in FIG. 6, the echoes 33 received by the first and second probes 27 and 28 are converted into a visible state and displayed on the monitor device 11. .

In the so-called A scope display which is generally used generally, for example, when there is a defect in the first dovetail portion 4, a peak P which does not appear in the normal A scope display shown in FIG. 5 appears as shown in FIG. .

In the ultrasonic flaw detector of the turbine rotor blade-implanted portion of the first embodiment, when the first dovetail portion 4 has a defect, the two-dimensional flaw detection image displayed on the display screen of the monitor device 11 is , Is displayed in the so-called B scope and is visually recognized as shown in FIG.

That is, as shown in FIG. 2, the rust adhered to the surface of the blade implanting portion 2 is caused by the 4ch probe holder 22.
Since the turbine rotor 1 is relatively moved along the circumferential direction for scanning, the echo is displayed as a horizontal striped echo in the scanning direction on the screen 11b displaying the flaw detection image in FIG. It

Since the defective portion 32 is located inside the surface of the blade-implanted portion 2 and is formed short in the scanning direction, it is misaligned at a position deviated from the horizontal stripe pattern. The echo 33 of the defective portion is displayed in a similar manner.

For this reason, it becomes easy to distinguish the rust and the like from defects, and during the inspection, the turbine rotor 1 to the turbine blade 3 are
It is no longer necessary to remove the…, and visually inspect it, and the maintainability is good.

Further, in the first embodiment, as shown in FIG. 1, the ultrasonic wave transmission angle is set to α = about 45 degrees, so that the reflected ultrasonic wave 34 reflected by the opposite side surface 2a. Also, the reflection angle α2 becomes about 45 degrees, and the defect portion 32 is flaw-detected.

In particular, cracks that occur at the root of the hook portion of the first dovetail portion 4 are often formed along the radial direction of the turbine rotor 1, and the projected area may be increased with respect to the flaw-detected portion. it can.

Therefore, the ultrasonic wave transmitted from the second probe 28 is further reflected by the defective portion formed in the flaw-detected portion in a short path, and returns to the second probe 28 at the shortest distance. In addition, the size of the portion to be inspected displayed on the monitor device 11 is large, and the defect 32 is easily visible.

Even if the inspected portion near the first dovetail portion 4, which is the tip edge of the blade implanting portion 2, is separated from the position of the second probe 28, the opposite side surface 2a is formed. Since the reflected ultrasonic waves reflected once are applied,
The defective portion formed along the radial direction of the turbine rotor 1 is captured with a large projected area.

The echo 33 on the screen 11b shown in FIG.
Length of the first dovetail portion 4 is about 5 mm, depth is about 1.0
The artificial slit of mm is shown. In this way, even a relatively small defect can be distinguished from rust and the like, and can be easily discriminated in the non-decomposed state.

Since the ultrasonic waves transmitted from the first probe 27 are directly applied to the inspected site near the opposite side surface 2a from the substantially front surface at an angle of about 45 degrees from the vertical direction, a shorter path is possible. Thus, it is possible to accurately capture a small defective portion such as a crack at the defective portion.

For example, in FIG. 7, an echo 35a having an artificial slit of 5.0 mm × 0.5 mm is provided in a portion surrounded by an ellipse D,
The echoes such as rust on the surface are displayed in a stepped manner at positions deviated from the horizontal stripe pattern, so that the echoes such as rust on the surface can be distinguished and visually recognized.

As described above, when the flaw detection image is displayed two-dimensionally, since the coordinate axis of the ultrasonic path is set in the direction orthogonal to the coordinate axis of the scanning direction, the surface of the turbine rotor 1 is The generated rust and the like overlap with echoes on the surface of the turbine rotor 1 detected on the same path, and are difficult to see.

However, a defect which is generated in a part of the flaw-detected portion apart from the surface layer, that is, a slit-like defect formed in the defect portions 32 and 35 of the first embodiment, is the same as the surface of the turbine rotor 1. It is visible as an echo on a screen of the monitor device 11 of the image processing device 31 in a part of a different path and in the scanning direction, which is different from other parts.

Therefore, when there is a defect in the turbine rotor 1, it can be easily distinguished from the one having no defect, and the rust and the like can be easily distinguished from the defect.

Further, in the first embodiment, the first and second probes 27, 28 individually have a transmitting / receiving function, so that it is possible to reduce the number of probes and suppress an increase in manufacturing cost.

Next, in the first embodiment, in order to improve the accuracy of flaw detection, the holder drive motor 24 is driven to rotate, so that the 4ch probe holder 22 is screwed into the ball screw 23 and is moved in the radial direction F. Is moved in the direction opposite to the center O of the turbine rotor 1.

The moving distance is determined by the position measuring encoder 25.
As a result, the number of rotations of the ball screw 23 is counted, and the position of the 4ch probe holder 22 is feedback-controlled, so that a predetermined position (distance r1 in FIG. 1 compared to when the first and second probes are used, blade implantation portion (2 tip end)
Will be stopped at.

In the first embodiment, since the 3rd and 4th probes 29 and 30 are attached to the 4ch probe to which the 1st and 2nd probes 27 and 28 are attached, these 3rd and 4th probes are attached.
By using the 4 probes 29 and 30, the flaw can be detected again by the so-called pitch catch method. For this reason, even a defect that is difficult to find with only the first and second probes 27 and 28 can be simultaneously verified with the third and fourth probes 29 and 30, so that a highly accurate inspection can be performed in a short time.

Further, it is not necessary to accurately grasp the tree shape of the blade implanting portion 2 in advance, and flaw detection can be performed with good accuracy.

Further, in the first embodiment, the 4ch probe holder 22 having four probes is provided on one side surface of the turbine rotor 1. However, the present invention is not limited to this, and a pair of substantially rectangular plate-shaped 4ch probe holders are provided. 22 and 22 may be provided so as to sandwich both side surfaces 1a and 1b from both sides of the turbine rotor 1 and may be scanned in the circumferential direction. In this case, it is possible to simultaneously inspect the flaw detection site on both sides. I can.

In this turbine rotor blade implanting part ultrasonic flaw detector and the flaw detecting method using the device, the ultrasonic wave transmitting direction of the third probe 29 as the ultrasonic wave transmitting portion is set as shown in FIG. By directing it toward the opposite side surface 36 of the insertion portion 2, reflected ultrasonic waves reflected a plurality of times are applied to the inspected portion 37 near the side surface 38 near the tip edge of the blade implantation portion 2, and Since the third probe 29 receives the signal from the fourth probe 30 on the same side surface, the side surface 3 including the opposite side surface 36
The inspected part 37 is reflected ultrasonic waves reflected multiple times by 8 or the like.
Even in the case of a shape in which flaws can be detected and the first and second probes 27, 28 cannot be brought close to each other, they can be caught with a large projected area.

[0107]

[First Modification] FIG. 10 shows a first modification of the first embodiment of the present invention.

The same or equivalent parts as in the first embodiment will be described with the same reference numerals.

In the ultrasonic flaw detector of the turbine rotor blade-implanted portion and the flaw detection method using this device according to the first modification, the first probe 27 and the second probe are provided on the 4-ch probe holder 22 located on one side surface of the turbine rotor 1. and the probe 28, at different positions in the circumferential direction, moreover, before the radial direction, with is provided to be offset after a third probe 29 and the fourth probe 30, predetermined angles beta (beta = 2 ~ 3
Degree) is set as the ultrasonic wave transmission angle and reflection angle,
Four pieces are arranged so as to be spaced apart at different positions in the circumferential direction, and are arranged side by side in a substantially C-shape in a side view.

Next, the operation of the first modification will be described.

In the modification 1 described above, in addition to the effect of the first embodiment, in addition to the first probe 27 and the second probe 28, the third probe 29 and the third probe 29 The four probes 30 are arranged in a radial direction at a predetermined angle β (β = 2 to 3 degrees) as an ultrasonic wave transmission angle and a reflection angle, so that the first probe 27 and the second probe 28 are used. The defect of the inspected part which is not detected is the third probe 29 and the fourth probe 30.
It is detected simultaneously by the pitch catch method using and.

Therefore, the flaw detection time can be shortened and
It is not necessary to accurately grasp the tree shape in advance, and flaw detection can be performed with good accuracy.

[0113]

[Modification 2] FIG. 11 shows a modification 2 of the first embodiment of the present invention.

The same or equivalent parts as in the first embodiment will be described with the same reference numerals.

In the ultrasonic flaw detector of the turbine rotor blade-implanted portion and the flaw detection method using this device according to the second modification, the first probe 27 and the second probe are provided on the 4-ch probe holder 22 located on one side surface of the turbine rotor 1. In addition, the probe 28 and the 4ch probe holder 122 located on the other side surface of the turbine rotor 1 are provided with the third probe 29 and the fourth probe 30 offset in the front and rear in the radial direction, for a total of four probes. It is arranged.

The third probe 2 in this modification 1
9 and the fourth probe 30 independently transmit and receive ultrasonic waves,
The third probe 29 may perform transmission, and the fourth probe 30 may perform reception, as in the first embodiment.

Next, the operation of the second modification will be described.

In the modification 2 described above, in addition to the function and effect of the first embodiment, the third probe 29 and the fourth probe 30 further detect a defect in a portion to be inspected on the opposite side. To do.

Therefore, it is possible to perform flaw detection with higher accuracy.

Other structures, functions, and effects are the same as or equivalent to those in the first embodiment, and therefore description thereof will be omitted.

[0121]

Second Embodiment FIGS. 12 to 17 show a second embodiment of the present invention.

The same or equivalent parts as in the first embodiment will be described with the same reference numerals.

In the turbine rotor blade-implanted portion ultrasonic flaw detector of the second embodiment and the flaw detection method using the same, as shown in FIG. 12, the side surface 101a has a turbine having a gradient of β2 = about 20 degrees. The root portion 4b of the first dovetail portion 4 and the root portion 5 of the second dovetail portion 5 of the rotor 101.
Artificial slits 41 and 42 each having a depth of about 1.0 mm and a length of about 5.0 mm are formed in b.

These first and second dovetail portions 4,5
Have integrally formed ridges 4c and 5c integrally formed in a substantially protruding shape from the side surface of the turbine rotor 101 of the blade implanting part 2, and when viewed from the transmission direction of ultrasonic waves, the ridges 4c and 5c
The radial cross section located on the back side of the root portions 4b and 5b has a substantially rectangular shape.

As shown in FIG. 13, in the second embodiment, the first ultrasonic probe 39 for flaw detection on the first dovetail portion 4 is arranged on the side surface 101a and at the same time as in FIG.
As shown in FIG. 4, the second ultrasonic probe 40 for flaw detection on the second dovetail portion 5 and the first ultrasonic probe 39 for flaw detection on the first dovetail portion 4 move forward and backward in the radial direction. It is arranged so as to be offset and located on the same side surface 101a.

In the first and second ultrasonic probes 39, 40 of the second embodiment, the substantially box-shaped cases 39b, 40b.
The first and second probes 39a and 40a, which also serve as the ultrasonic wave transmitting portion and the ultrasonic wave receiving portion, are fitted to the lens so that the angle can be freely set.

In the second embodiment, with respect to the site to be inspected in which the artificial slits 41 and 42 are formed,
The cases 39b and 40b are fitted at an angle γ of about 65 degrees so that ultrasonic waves can be transmitted and received at an incident angle α of about 45 degrees.

Next, the operation of the second embodiment will be described.

In the second embodiment having such a configuration,
As shown in FIG. 13, the ultrasonic waves transmitted from the ultrasonic probe 39 are first reflected by the side surface 2a on the opposite side of the blade implantation portion 2 to dispose the first ultrasonic probe 39. The first dovetail portion 4 on the installed side is inserted into the protruding portion 4c, passing over the portion to be inspected.

In the ridge 4c, the ultrasonic waves are reflected a plurality of times by the inner side surfaces of the walls 4d and 4e in the ridge 4c, and the ultrasonic waves in the flaw-detected site where the artificial slit 41 is formed. Turn around from the back side.

As described above, since the ultrasonic wave wraps around from the back side wall portion 4e to detect the portion to be inspected in which the artificial slit 41 is formed, a portion S1 behind the artificial slit 41 in the ultrasonic wave irradiation direction is detected. , There are no side walls, etc.

Therefore, the two graphs G on the upper side of FIG.
As shown in G1 and G2, in contrast of the images of A scope,
The defect can be accurately captured by the peak P1 of the echo, which is not visible in the right graph G2 obtained by flaw detection of the sound part and is seen in the left graph G1 capturing the artificial slit 41.

Further, as shown in the graph G3 on the lower side of FIG. 16, even in the image of the B scope, an echo image P2 which is clearly different from other sound parts is projected on the monitor device 11 of the image processing device 31 and visually recognized. It can be done and the defect can be grasped accurately.

Further, as shown in FIG. 14, the ultrasonic probe sound wave transmitted from the ultrasonic probe 40 is directly connected to the ultrasonic wave as shown in an enlarged view surrounded by a chain line in FIG. Two
The dovetail portion 5 enters into the ridge portion 5c. In the ridge portion 5c, the ultrasonic waves are reflected by the wall portions 5d and 5e a plurality of times, and the ultrasonic waves wrap around so as to irradiate the flaw-detected portion in which the artificial slit 42 is formed from the back side. Then, flaw detection is performed.

As described above, since ultrasonic waves wrap around from the back side of the portion to be flaw-detected in which the artificial slit 42 is formed, flaw detection is performed, so that there is no side wall or the like behind S2 of the artificial slit 42.

Therefore, the two graphs G on the upper side of FIG.
As shown in G4 and G5, in comparison of the images of A scope,
No echo is visible in the right graph G5 obtained by flaw detection on the sound part, but in the left graph G4 capturing the artificial slit 42, the echo peak P3 is displayed on the monitor device 11 of the image processing device 31 and can be visually recognized.

Further, as in the graph G6 on the lower side of FIG. 17, an echo image P4 that is clearly different from other sound parts can be visually recognized in the image of the B scope, and the defect can be accurately grasped.

Further, in the second embodiment, the substantially box-shaped cases 39b and 40b are provided with the first and second probes 39a and 39a which also serve as an ultrasonic wave transmitting portion and an ultrasonic wave receiving portion.
40a is fitted so that the angle can be freely set. Therefore, by appropriately changing the angles of the first and second probes 39a and 40a, it is not necessary to accurately grasp the tree shape in advance, and inspection can be performed with good accuracy.

The other structures, functions, and effects are the same as or equivalent to those in the first embodiment, and the description thereof will be omitted.

[0140]

Third Embodiment FIG. 18 shows a third embodiment of the present invention.

The same or equivalent parts as those in the first and second embodiments will be described with the same reference numerals.

A turbine rotor blade-implanted portion ultrasonic flaw detector of the third embodiment and a flaw detection method using the same are as shown in FIG.
As shown in FIG. 8, the slit 43 is formed along the wall portion 4e at the side tip at the inspected portion in the protruding portion 4c of the first dovetail portion 4.
Is used when the

In such a structure, the first probe 27 is arranged so that ultrasonic waves can be transmitted and received at the incident angle α of about 45 degrees toward the opposite side surface 2a.

Next, the operation of the third embodiment will be described.

In the third embodiment configured as described above,
As shown in FIG. 18, the ultrasonic wave transmitted from the first probe 27 is first reflected by the side surface 2 a on the opposite side of the blade implanting portion 2 and then the wall portion on the tip side of the blade implanting portion 2. It is reflected by 4d and enters into the protrusion 4c of the first dovetail portion 4 on the side where the first probe 27 is arranged.

In the protruding portion 4c, the ultrasonic waves are applied to the slit 43 of the inspected portion from a substantially front surface in a wide projection area.

The other constructions, functions and effects are the same as or equivalent to those of the first and second embodiments, and therefore their explanations are omitted.

[0148]

Fourth Embodiment FIG. 19 shows a fourth embodiment of the present invention.

The same or equivalent parts as those in the first to third embodiments will be described with the same reference numerals.

In the ultrasonic flaw detector of the turbine rotor blade-implanted portion and the flaw detection method using this device according to the fourth embodiment, the ultrasonic flaw detection method of the first probe 27 is about 45 degrees.
The configuration directed to the opposite side surface 2a near the second dovetail portion 5 is substantially the same as that in the first embodiment.

[0151] In the fourth embodiment, as shown in FIG. 19, the radial direction F of the turbine rotor 1, in the rotor board the plane, .beta.3 = about 10 degrees to 20 degrees, the direction morphism irradiation by shaking the scanning direction It is configured to emit ultrasonic waves.

Other configurations, functions, and effects are the same as or equivalent to those in the first to third embodiments, so description thereof will be omitted.

Although the first to fourth embodiments of the present invention and the respective modified examples 1 and 2 have been described above with reference to the drawings, the present invention is not limited to the first embodiment, and the present invention is not limited thereto. Even if there is a design change within the scope of not changing the gist of the present invention, it is included in the present invention.

For example, in the first embodiment, the 4ch probe holder 22 to which the first and second probes 27, 28 are attached.
The third and fourth probes 29, 30 are mounted on one side surface, but the number, shape, and performance of the probes are not particularly limited, for example, by providing transmitting and receiving probes on both sides. Absent.

In the first embodiment, the first and second
The ultrasonic wave irradiation directions of the probes 27 and 28 are about 45 degrees as shown by the one-dot chain line and the two-dot chain line in FIG. 1, and are directed to the opposite side surface 2a in the vicinity of the second dovetail portion 5. However, the projection area of the defect at the flaw detection site is set to be large within a range of about 0 degrees to about 60 degrees, preferably about 0 degrees to about 45 degrees. Is natural.

[0156]

As described above, according to the first aspect of the present invention.
In the one described in, since the direction of the ultrasonic wave transmitted from the ultrasonic wave transmitting section and the direction of the reflected echo match the radial direction of the turbine rotor, the distance to the flaw-detected portion is Short, as in the prior art, compared to ultrasonic waves that are irradiated by being given a predetermined angle α, in a short path, the ultrasonic waves transmitted from the ultrasonic wave transmitting section is reflected at the defect site, It returns to the ultrasonic wave receiving unit at the shortest distance.

In the image processing section, the echo received by the ultrasonic wave receiving section is converted into a visible state and displayed on the display section.

In the two-dimensional flaw detection image displayed on the display screen of the display section, the rust adhering to the surface of the blade-implanted section runs along the circumferential direction of the turbine rotor along with the ultrasonic probe. Since they are moved relative to each other for scanning, a horizontal striped pattern is displayed in the scanning direction.

Since the defective portion is located inside the surface of the blade-implanted portion and is formed so as to be short in the scanning direction, the defective portion is formed in a stepwise manner at a position deviated from the horizontal stripe pattern. Partial echo is displayed.

Therefore, it becomes easy to distinguish between the rust and the like and the defect, and it is not necessary to remove the turbine blade from the turbine rotor and visually inspect it during the inspection, and the maintainability is good.

[0161] Further, those described in claim 2, the setting of ultrasonic wave transmission angle degrees, with respect to the flaw portion, the projected area increases.

Therefore, the ultrasonic wave transmitted from the ultrasonic wave transmitting section in a shorter distance is further reflected at the defective portion,
While returning to the ultrasonic wave receiving unit at the shortest distance, the size of the flaw detection portion displayed on the display unit is large and easy to visually recognize.

Then, according to the third aspect,
The portion to be inspected in the vicinity of the tip edge of the blade-implanted portion is separated from the ultrasonic wave transmitting portion, for example, even in the vicinity of the tip of the blade-implanted portion of the turbine rotor, once on the opposite side surface. Since the reflected reflected ultrasonic waves are applied, the defective portion formed along the radial direction of the turbine rotor can be captured with a large projected area.

Further, according to the fourth aspect, the reflected ultrasonic waves reflected a plurality of times on the side surface including the opposite side surface are:
Since it is applied to the inspected part, even a flaw detection having a shape in which the ultrasonic probe cannot be brought close to the inspected part can be captured with a large projected area.

Further, according to the fifth aspect,,Super
The part to be inspected near the side opposite to the sound wave transmitterDirect
Since contact and ultrasonic waves are applied, the defective part can be
The position can be captured accurately.

Then, according to the sixth aspect,
Since a total of four ultrasonic probes are arranged on one side surface of the turbine rotor, for example, by detecting with different incident angles, it is possible to detect a defective portion that is difficult to detect with a single ultrasonic probe. It can detect and detect flaws with better accuracy.

Further, according to the seventh aspect, since both sides of the blade implanting portion of the turbine rotor can be inspected at the same time, the inspection time can be shortened and the increase of the inspection cost can be suppressed.

Further, according to the eighth aspect, the radial position adjusting means adjusts the radial position of the ultrasonic probe.

Therefore, the ultrasonic probe can be positioned at a radial position where a defective portion can be more accurately captured, and flaw detection can be performed with good accuracy.

According to the ninth aspect, the angle adjusting means can adjust the ultrasonic wave transmitting angle of the ultrasonic probe.

Therefore, the ultrasonic probe can be directed to an angle at which the defective portion can be captured more accurately, and flaw detection can be performed with good accuracy.

According to the tenth aspect,
The ultrasonic wave transmitted from the ultrasonic wave transmitting portion of the ultrasonic probe is reflected by the flaw-detected portion and is received by the ultrasonic wave receiving portions arranged at different positions in the circumferential direction of the turbine rotor. .

Therefore, it is not necessary to accurately grasp the shape of the flaw-detected portion in advance, and flaw detection can be easily performed.

According to the eleventh aspect, since the ultrasonic waves wrap around from the back side of the flaw-detected portion to perform flaw detection, there is no side wall or the like behind the flaw-detected portion,
You can accurately grasp the defects.

According to the twelfth aspect,
When the flaw detection image is displayed two-dimensionally, since the coordinate axis of the ultrasonic path is set in the direction orthogonal to the coordinate axis in the scanning direction, the rust or the like generated on the surface of the turbine rotor is the same path. It is difficult to see because it overlaps with the surface of the turbine rotor detected in.

However, a defect generated in a part of the flaw-detected portion separated from the surface layer is visually recognized in a path length different from the surface of the turbine rotor, and in a scanning direction, partly different from other portions. It

Therefore, when there is a defect in the turbine rotor, it is possible to easily distinguish it from one that does not have a defect, and it is easy to distinguish between a rust and the like and a defect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a turbine rotor blade-implanted portion ultrasonic flaw detector according to a first embodiment of the present invention at a position along a radial direction of a blade portion of a turbine rotor.

FIG. 2 is a side view illustrating a state in which the turbine rotor blade implanting section ultrasonic flaw detector according to the first embodiment performs flaw detection on the turbine rotor using the turbine rotor blade implanting section ultrasonic flaw detector. It is a figure.

FIG. 3 is a side view of the blade-implanted portion of the turbine rotor in the ultrasonic flaw detector of the turbine rotor blade-implanted portion of the first embodiment.

FIG. 4 is a graph diagram drawn by a general A scope, and is a schematic diagram for explaining how a defect is caught.

FIG. 5 is a graph diagram drawn by a general A scope and is a schematic diagram for explaining a state in a normal state.

FIG. 6 is a graph drawn by a B scope in the ultrasonic flaw detector for turbine rotor blade implanting part of the first embodiment,
It is a schematic diagram explaining the mode which caught the defect of the 1st dovetail part vicinity.

FIG. 7 is a graph drawn by a B scope in the ultrasonic flaw detector of the turbine rotor blade implanting part of the first embodiment,
It is a schematic diagram explaining the mode which caught the defect of the 2nd dovetail part vicinity.

FIG. 8 is a schematic view showing the positional relationship between the outer surface of the turbine rotor and each probe in the ultrasonic flaw detector of the turbine rotor blade implanting part and the flaw detection method using the same according to the first embodiment.

FIG. 9 is a schematic diagram illustrating the arrangement of probes in the first embodiment.

FIG. 10 is a schematic diagram for explaining the arrangement of probes in the first modification of the first embodiment.

FIG. 11 is a schematic diagram for explaining the arrangement of the probes in the second modification of the first embodiment.

FIG. 12 is a diagram illustrating an ultrasonic flaw detector for a turbine rotor blade implanting section and a flaw detection method using the apparatus according to the second embodiment, in which (a):
The side view of the blade | wing implant part of a turbine rotor, (b) is sectional drawing in the position along a radial direction.

FIG. 13 is a cross-sectional view at a position along the radial direction for explaining the inspection in the vicinity of the first dovetail portion according to the second embodiment.

FIG. 14 is a cross-sectional view at a position along the radial direction for explaining the inspection in the vicinity of the second dovetail portion according to the second embodiment.

FIG. 15 is a side view of the blade implanting portion of the turbine rotor for explaining the inspection of the vicinity of the first and second dovetail portions in the second embodiment.

FIG. 16 is a front view illustrating an example of a monitor image obtained by the inspection of the vicinity of the first dovetail portion according to the second embodiment.

FIG. 17 is a front view illustrating an example of a monitor image obtained by an inspection in the vicinity of a second dovetail portion according to the second embodiment.

FIG. 18 is a cross-sectional view at a position along a radial direction of a blade implanting portion of a turbine rotor in the third embodiment.

FIG. 19 is a side view of the blade implanting portion of the turbine rotor corresponding to FIG. 3 in the fourth embodiment.

FIG. 20 is a perspective view of a conventional turbine rotor.

FIG. 21 is a partial cross-sectional view showing a state in which turbine blades are attached to a blade implanting portion of a conventional turbine rotor.

FIG. 22 is a conceptual diagram showing a state of flaw detection with a shallow incident angle in a conventional ultrasonic flaw detector for a turbine rotor blade implantation section.

FIG. 23 is a graph diagram drawn by an A scope in an ultrasonic flaw detector of one conventional turbine rotor blade implantation section,
It is a schematic diagram explaining the mode which caught the defect of the dovetail part vicinity.

FIG. 24 is a graph diagram drawn by an A scope in the conventional ultrasonic flaw detector for turbine rotor blades, and is a schematic diagram showing a normal state.

FIG. 25 is a side view of a blade implantation portion of a turbine rotor in another conventional ultrasonic flaw detector for turbine rotor blade implantation portion.

FIG. 26 is a side view of a blade portion of a turbine rotor for explaining the arrangement of probes adopting a pitch catch method in another conventional ultrasonic flaw detector for turbine rotor blade implantation portion.

FIG. 27 is a front view of a blade portion of a turbine rotor for explaining an arrangement of probes adopting a pitch catch method in another conventional ultrasonic flaw detector for turbine rotor blade implantation portion.

FIG. 28 is a graph showing an example of a B-scope image drawn by a pitch catch method in another conventional ultrasonic flaw detector for turbine rotor blades.

FIG. 29 shows another conventional ultrasonic flaw detector for a turbine rotor blade-implanted portion, showing defects that can be caught and defects that cannot be caught. (A) shows a state in which the first dovetail part is completely omitted. Sectional view, (b) is a sectional view showing a state in which the first dovetail portion is partially cut away, and (c) is a sectional view in which a hook portion on one side of the first dovetail portion is completely removed, ( d)
Is a cross-sectional view showing a state in which the one-side hook portion of the first dovetail portion is partially cut away, and (e) is a cross-sectional view showing a state in which a crack is generated at the root portion of the one-side hook portion of the first dovetail portion. is there.

[Explanation of symbols]

1,101 turbine rotor 1a One side 1b Other side 2 Wing implant part 3 turbine blades Ultrasonic flaw detector for turbine rotor blade 11 Monitor device (display unit) 27 First probe 28 Second probe 29 3rd probe (ultrasonic wave transmitter) 30 4th probe (ultrasound receiver) 31 Image Processing Device (Image Processing Unit) 32,35 defective part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Tsuji 4-10-13 Ibori, Ogura Kita-ku, Kitakyushu-shi, Fukuoka Within New Japan Nondestructive Inspection Co., Ltd. (72) Inventor Naofumi Haneda Ibori, Ogura-kita, Kitakyushu, Fukuoka 4-10-13 Inside New Japan Non-Destructive Inspection Co., Ltd. (56) Reference JP-A-4-194745 (JP, A) JP-A 64-66560 (JP, A) JP-A 2000-329749 (JP, A) JP-A-11-304770 (JP, A) JP-A-2000-214136 (JP, A) Actual development Sho 62-22553 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01N 29 / 00-29/28

Claims (13)

(57) [Claims] 1. An ultrasonic wave transmitting section for transmitting an ultrasonic wave to a blade implanting section of a turbine rotor on which a turbine blade is mounted, and
An ultrasonic probe having an ultrasonic wave reception unit that receives an echo of the ultrasonic wave transmitted from the ultrasonic wave transmission unit, and a display unit that converts the echo received by the ultrasonic wave reception unit into a visible state In a turbine rotor blade implanting section ultrasonic flaw detector having an image processing section for displaying, a direction of an ultrasonic wave transmitted from the ultrasonic wave transmitting section and a direction of a reflected echo are set in a radial direction of the turbine rotor. The ultrasonic wave that is transmitted from the ultrasonic wave transmission section
The wing by directing it toward the side surface on the opposite side of the wing implantation section.
The opposite side to the inspected part near the tip edge of the implant part
Wherein with placing an ultrasonic probe to direct ultrasonic waves are reflected by the side surface, subjected to scanning by relative movement and along said ultrasonic feeler element in a circumferential direction of the turbine rotor, the image processing The turbine rotor blade is configured to display a flaw detection image in a two-dimensional manner by setting a coordinate axis of an ultrasonic path length in a direction orthogonal to a coordinate axis of a scanning direction on the display screen of the display unit. Ultrasonic flaw detector for implant area. Wherein said ultrasonic probe, wherein disposed on one side surface of the turbine rotor, moreover, with respect to the flaw portion, as projected area increases sets the ultrasonic wave transmission angle < The ultrasonic flaw detector according to claim 1, wherein: 3. An ultrasonic wave transmitting direction of the ultrasonic wave transmitting section is directed to a side surface on the opposite side of the blade implanting section, so that the side surface on the opposite side of the inspected site near the tip edge of the blade implanting section. The ultrasonic flaw detector according to claim 1 or 2, wherein the reflected ultrasonic waves reflected once by (1) are applied. 4. An ultrasonic wave transmitting direction of the ultrasonic wave transmitting section is directed to a side surface on the opposite side of the blade implanting section, so that the side surface on the opposite side of the inspected site near the tip edge of the blade implanting section. The ultrasonic flaw detector according to claim 1 or 2, characterized in that reflected ultrasonic waves reflected a plurality of times by the side surface including are applied. 5. The placed side of the ultrasonic wave transmitting unit ultrasonic wave transmission direction of the ultrasonic wave transmission unit, by directing the side surface of the opposite side, even directly to the examination site of said opposite side surfaces near The ultrasonic flaw detector according to claim 1 or 2, wherein the ultrasonic flaw is applied. 6. The ultrasonic probe includes a tip ultrasonic probe for detecting a portion to be inspected in the vicinity of a tip edge of a blade-implanted portion, and a portion to detect an inspection portion in the vicinity of the opposite side surface. 2. A site ultrasonic probe, wherein a total of four of the tip site ultrasonic probe and the nearby site ultrasonic probe are arranged on one side surface of the turbine rotor. 6. The ultrasonic flaw detector according to claim 5, wherein the ultrasonic flaw detector is a turbine rotor blade-implanted portion. 7. The ultrasonic probe includes a tip portion ultrasonic probe for flaw detection on a portion to be inspected in the vicinity of a tip edge of a wing implant portion, and a portion to inspect an portion to be inspected on the side surface on the opposite side. A partial ultrasonic probe, wherein the tip partial ultrasonic probe and the adjacent partial ultrasonic probe are respectively provided on both side surfaces of the turbine rotor, and a total of four are arranged. Item 6. The ultrasonic flaw detector for a turbine rotor blade implanting part according to any one of items 1 to 5. 8. The ultrasonic probe is provided with radial position adjusting means for adjusting the radial position of the turbine rotor. An ultrasonic flaw detector for implanting a turbine rotor blade according to the above item. 9. The turbine according to claim 1, wherein the ultrasonic probe is provided with angle adjusting means capable of adjusting an ultrasonic wave transmitting angle. Ultrasonic flaw detector for rotor blade implantation part. 10. An ultrasonic wave transmitting section for transmitting an ultrasonic wave to an impeller of a turbine rotor equipped with a turbine blade, and an ultrasonic wave for receiving an echo of an ultrasonic wave transmitted from the ultrasonic wave transmitting section. Turbine rotor blade implanting section ultrasonic flaw detection having an ultrasonic probe having a receiving section and an image processing section for converting the echo received by the ultrasonic receiving section into a visible state and displaying it on the display section In the device, the ultrasonic wave transmission part of the ultrasonic probe is a
The wing by directing it toward the side surface on the opposite side of the wing implantation section.
The opposite side to the inspected part near the tip edge of the implant part
Ultrasonic waves reflected on the side surface hit a large projected area
, Set the ultrasonic wave transmission angle, and
The ultrasonic wave transmitting unit is arranged at a position different from the ultrasonic wave transmitting unit in the circumferential direction of the turbine rotor, and the ultrasonic probe is relatively moved along the circumferential direction of the turbine rotor to perform scanning,
In the image processing unit, the display screen of the display unit, in a direction perpendicular to the scanning direction of the coordinate axis, characterized by being configured to display a two-dimensional flaw detection image by setting the coordinate axis of the ultrasonic path length Ultrasonic flaw detector for turbine rotor blades. 11. A flaw detection method using an ultrasonic flaw detector for a blade-implanted portion of a blade-implanted portion, which has a protruding shape protruding from one side surface of the blade-implanted portion of the turbine rotor to a side, before the other side opposite the urging only root of Kitsubasa implanting portion, wherein it sends out ultrasonic waves from the ultrasonic transmission unit, within the blade implanting portion located on the back side of the root portion of the blade implanting portion 11. The ultrasonic wave is caused to wrap around the back side of the flaw-detected portion by performing a plurality of reflections to perform flaw detection.
A flaw detection method using the ultrasonic flaw detector of the turbine rotor blade implantation section according to any one of the above. 12. The method of claim 11, wherein the ultrasound transmitting angular direction to be flaw portion of the ultrasonic probe, set so that the projection area is increased
The ultrasonic probe is moved relative to the turbine rotor along the circumferential direction of the turbine rotor for scanning, so that the image processing unit causes the display screen of the display unit to orthogonally intersect the coordinate axis in the scanning direction. in the direction of, claims 1 to 1 any one claim of data Binrota blade implanting portion ultrasonic testing of 0, characterized in that to display a two-dimensional flaw detection image by setting the coordinate axis of the ultrasonic path length Flaw detection method using a device. 13. A rotor is arranged in a radial direction of the turbine rotor.
The irradiation direction is swung in the scanning direction Irradiate ultrasonic waves
10. The method according to claim 1, wherein
The ultrasonic flaw detector of the turbine rotor blade implantation section described.