JP2002310998A - Ultrasonic flaw detector for turbine rotor blade implanted part and flaw detection method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector for a turbine rotor blade implanted part easily discriminating between rust or the like and a flaw and having good maintenance properties and high accuracy. SOLUTION: The ultrasonic flaw detector has an ultrasonic probe for transmitting and receiving ultrasonic probes with respect to the blade implanted part 2 of the turbine rotor 1 having turbine blades 3 and an image processor 31 for converting a received echo to a visually confirmable state to display the same on a monitor 1. First and second probes 27 and 28 are arranged so as to allow the direction of transmitted ultrasonic waves and the direction of the reflected echo to almost coincide with the diameter direction of the turbine rotor and moved relatively along the peripheral direction of the turbine rotor 1 to perform scanning. By this constitution, in the image processor, the coordinates axis of the distance of ultrasonic waves is set in the direction crossing the coordinates axis in a scanning direction at right angles to two- dimensionally display a flaw detection image on the display screen of a display part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-precision nondestructive inspection device capable of detecting a defect existing inside a metal.

[0002]

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

The wing implant 2 is formed with first to third dovetails 4 to 6 at predetermined intervals from the leading edge, and the first to third dovetails 4 to 6 are formed. , The base end 3a of the turbine blade 3 is engaged.

[0004] In the blade implant 2 configured as described above, there is a fear that cracks may occur during operation due to corrosion fatigue and stress corrosion cracking (SCC).

For this reason, the operation of the turbine rotor 1 is periodically stopped, and as shown in FIGS. 22 to 24, flaw detection is performed by using the turbine rotor blade implanted part ultrasonic flaw detector 7. I have.

[0006] The ultrasonic inspection device 7 for the turbine rotor blade implanted portion mainly transmits an ultrasonic wave to the blade implanted portion 2 and the ultrasonic wave transmitted from the ultrasonic transmitter 9. A probe 8 as an ultrasonic probe having an ultrasonic receiving unit 10 for receiving an ultrasonic echo is provided.

[0007] The ultrasonic flaw detector 7 of the turbine rotor blade implanted portion converts the echo received by the ultrasonic receiver 10 into a viewable state, and displays a screen 11a of a monitor device 11 as a display. An image processing device 12 is provided as an image processing unit to be displayed above.

Next, the operation of the conventional ultrasonic inspection device 7 for the turbine rotor blade implanted portion will be described.

[0009] In the conventional ultrasonic inspection device 7 for turbine blade blade implanted portion configured as described above, first, the probe 8 is located on one side 1a of the turbine rotor 1 and the blade implanted portion 2 is positioned. At the shallow incidence angle θ (θ = approximately 20 degrees) toward the first dovetail portion 4 located near the tip of the ultrasonic wave, the ultrasonic wave is transmitted from the ultrasonic wave transmitting portion 9 and the echo (reflected wave) is generated. The sound wave is received by the sound wave receiving unit 10.

The received echo is transmitted to the image processing device 1
23, it is converted into a state as shown in FIG. 23 or FIG.
Displayed as a scope image.

On the screen of the monitor device 11, first, ultrasonic waves are applied to the notch groove 4a provided beforehand, and the initial value is set so that the height of the echo 13 is about 80% as shown in FIG. Is done.

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

FIGS. 25 to 29 show another turbine rotor blade implanted ultrasonic inspection apparatus 14 called a so-called pitch catch method.

To begin with, the structure will be described. In the turbine rotor blade implanted part ultrasonic inspection apparatus 14, a probe as an ultrasonic probe is used in substantially the same manner as the turbine rotor blade implanted part ultrasonic inspection apparatus 7. Ultrasonic transmitters 9a, 9 to constitute
b and the ultrasonic receiving units 10a and 10b are separately provided on both sides 1a and 1b of the blade implant 2 of the turbine rotor 1.
It is provided on the side.

As shown in FIG. 26, these ultrasonic transmitting portions 9a and 9b receive ultrasonic waves at a predetermined angle α (α = about 30 degrees) with respect to the radial direction r of the turbine rotor 1. It is configured to be.

As shown in FIG. 25, the incident angle θ with respect to the first dovetail portion 4 is shallow (θ = approximately 20 degrees) as in the above-described conventional example, and is radiated from each of the ultrasonic transmitting portions 9a and 9b. The so-called four-channel pitch catch system in which the ultrasonic waves are received by the ultrasonic receiving units 10a and 10b provided on the opposite side surface of the turbine rotor 1 is adopted.

Next, the operation of another conventional ultrasonic inspection device 14 for a turbine rotor blade implanted portion will be described.

In another ultrasonic flaw detector 14 having the turbine rotor blade implanted portion configured as described above, for example, the ultrasonic waves emitted from the ultrasonic transmitter 9a are reflected by the blade implanted portion 2 and the turbine The ultrasonic waves received from the ultrasonic wave transmitting section 9b while being received by the ultrasonic wave receiving section 10a provided on the opposite side surface of the rotor 1 are reflected by the blade implant section 2 and are reflected on the opposite side of the turbine rotor 1. It is received by the ultrasonic receiving unit 10b provided on the side surface.

Further, for example, the ultrasonic wave emitted from the ultrasonic wave transmitting section 9a is reflected by the blade implanting section 2 and the ultrasonic wave receiving section 10b provided on the opposite side surface of the turbine rotor 1 is provided.
May be received by the ultrasonic transmission unit 9b.
May be reflected by the blade implant 2 and received by the ultrasonic receiver 10 a provided on the opposite side surface of the turbine rotor 1.

When scanning is performed along the direction of rotation of the turbine rotor 1 indicated by white arrows in FIGS. 26 and 27, as shown in FIG. 28, a so-called B-scope image (scanning direction, ultrasonic path length is taken along two axes). This is obtained in a two-dimensionally recognizable state.

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

For this reason, the rust adhering to the surface of the wing implant portion 2 is lightly displayed on the screen 14a in a horizontal stripe pattern in the scanning direction, and as shown in FIG. The pattern is distinguished from the image of the defective portion that is clearly displayed. Therefore, it is possible to easily discriminate the defective portion from the rust.

Other ultrasonic flaw detectors of this type of turbine rotor blade implanted part are disclosed in Japanese Patent Application Laid-Open Nos. 7-244024, 61-240159, and 2-4.
Japanese Patent Application Laid-Open Nos. 4245, 2-242148, 4-16758, 4-274754, 5-288723 and the like are known.

[0024]

However, in the conventional ultrasonic inspection equipment for a turbine rotor blade implanted portion as shown in FIGS. 22 to 24, the notch groove 4a is substantially the same as the echo 13 shown in FIG. If a strong echo with an echo height of about 80% is visually recognized, it can be determined to be a defect.
It is difficult to determine whether the surface of the first dovetail portion 4 is rust or a pit (small hole). In such a case, the turbine blades 3 must be removed from the turbine rotor 1 and visually inspected. .

If the turbine blades 3 are removed from the turbine rotor 1 and visually inspected, the inspection time and the inspection cost increase.

In the ultrasonic inspection apparatus 14 shown in FIGS. 25 to 27, the rust echo and the defect echo such as a crack can be easily distinguished. The path of the ultrasonic wave is long, the incident angle θ with respect to the first dovetail portion 4 is shallow (θ = about 20 degrees), and the resolution is low as in the conventional example.

For example, as shown in FIG. 29A, both hooks of the first dovetail portion 4 are penetrated, and FIG.
As shown in FIG. 29 (c), a drop with a width w of about 10 mm can be detected as in the one hook penetrating state of the first dovetail portion 4, but a small drop as shown in FIG. 2
9 (e), a crack 15 formed at the base of the hook on one side of the first dovetail portion 4 along the radial direction of the turbine rotor 1 is difficult to determine because the projected area is small.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to make it easy to discriminate between rust and the like and defects, and to provide a high-precision ultrasonic inspection apparatus for turbine rotor blade implanted parts with good maintainability and high accuracy. An object of the present invention is to provide a flaw detection method using an apparatus.

[0029]

According to the first aspect of the present invention, there is provided an ultrasonic wave transmitting ultrasonic wave to a blade implant portion of a turbine rotor on which a turbine blade is mounted. An ultrasonic probe having a transmitting unit and an ultrasonic receiving unit that receives an ultrasonic echo transmitted from the ultrasonic transmitting unit, and converting the echo received by the ultrasonic receiving unit into a visible state. And an image processing unit for displaying on the display unit and an ultrasonic flaw detector for implanting a turbine rotor blade,
Along with arranging the ultrasonic probe so that the direction of the ultrasonic wave transmitted from the ultrasonic transmission unit and the direction of the reflected echo match the radial direction of the turbine rotor,
By performing relative scanning with the ultrasonic probe along the circumferential direction of the turbine rotor and scanning, in the image processing unit, on a display screen of the display unit, in a direction orthogonal to a coordinate axis in a scanning direction. In addition, the present invention is characterized by a turbine rotor blade implanted part ultrasonic flaw detector which sets a coordinate axis of an ultrasonic path and displays a flaw detection image two-dimensionally.

According to the first aspect of the present invention, the direction of the ultrasonic wave transmitted from the ultrasonic probe and the direction of the reflected echo are the same as those of the turbine rotor. Since the distance coincides with the radial direction, the distance to the flaw-detected portion is short, and the ultrasonic wave transmission is performed in a shorter path compared to the ultrasonic waves irradiated at a predetermined angle α as in the conventional case. The ultrasonic wave transmitted from the unit is reflected at the defect site and returns to the ultrasonic receiving unit at the shortest distance.

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

[0032] In the two-dimensional flaw detection image displayed on the display screen of the display unit, the rust attached to the surface of the blade implant unit causes the ultrasonic probe to move along the circumferential direction of the turbine rotor. Since they are relatively moved and scanned, they are represented in a horizontal stripe pattern in the scanning direction.

Since the defective portion is located inside the surface of the wing implanted portion and is formed short in the scanning direction, the defective portion is stepped at a position shifted from the horizontal stripe pattern. A partial echo is displayed.

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

According to the second aspect of the present invention, the ultrasonic probe transmits the ultrasonic wave so as to increase the projected area on one side surface of the turbine rotor and the flaw-detected portion. 2. The ultrasonic flaw detector according to claim 1, wherein the ultrasonic flaw detector is disposed at an angle close to the vertical direction.

Here, for example, the ultrasonic transmission angle approached in the vertical direction is an angle of about 45 degrees from the vertical direction on one side.

According to the second aspect of the present invention, by making the ultrasonic wave transmission angles close to each other in the vertical direction, the projection area becomes larger with respect to the flaw detection portion.

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

According to the third aspect of the present invention,
By directing the ultrasonic transmission direction of the ultrasonic transmission section to the side surface opposite to the wing implantation portion, the ultrasonic wave is reflected once by the opposite side surface with respect to the inspection site near the tip edge of the wing implantation portion. The ultrasonic flaw detector according to claim 1 or 2, wherein the reflected ultrasonic waves are applied.

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

Further, according to the fourth aspect of the present invention, the ultrasonic transmission direction of the ultrasonic transmission section is directed toward the side surface opposite to the wing implantation section, so that the ultrasonic transmission section near the tip edge of the wing implantation section. 3. The ultrasonic inspection system according to claim 1, wherein the reflected ultrasonic waves reflected a plurality of times on the side surface including the opposite side surface are applied to the inspection site.

According to the fourth aspect of the present invention, since the reflected ultrasonic waves reflected a plurality of times on the side surface including the opposite side surface are applied to the inspected portion, the ultrasonic inspection is performed on the inspected portion. Even a flaw with a shape that does not allow the touching element to approach is captured with a large projected area.

According to the fifth aspect of the present invention, by directing the ultrasonic wave transmitting direction of the ultrasonic transmitting unit to a side surface opposite to the side surface on which the ultrasonic transmitting unit is arranged,
The ultrasonic flaw detector according to any one of claims 1 to 2, wherein ultrasonic waves are applied directly to the inspection site near the opposite side surface.

According to the fifth aspect of the present invention, since the ultrasonic wave is applied directly to the inspected part near the opposite side surface from the ultrasonic wave transmitting part, the defective part can be shortened in a shorter distance. Can be accurately captured.

And, according to the sixth aspect,
The ultrasonic probe has a tip portion ultrasonic probe for flaw detection of a portion to be inspected near a tip edge of a wing implant portion, and a nearby portion ultrasonic probe for flaw detection of a portion to be inspected near the opposite side surface. 6. The ultrasonic transducer according to claim 1, further comprising: a tip part ultrasonic probe and a neighboring part ultrasonic probe arranged on one side surface of the turbine rotor. 7. It features an ultrasonic flaw detector for the turbine rotor blade implant.

According to the sixth aspect of the present invention, since a total of four ultrasonic probes are arranged on one side of the turbine rotor, for example, detection is performed by changing the incident angle. This makes it 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-detecting a portion to be inspected near a tip edge of a wing implant portion, and the opposite side. A near-region ultrasonic probe for flaw-detecting the inspected region near the side surface, and the tip region ultrasonic probe and the near-region ultrasonic probe are provided on both side surfaces of the turbine rotor, respectively. The ultrasonic flaw detector according to any one of claims 1 to 5, wherein four ultrasonic flaw detectors are arranged.

According to the seventh aspect of the present invention, since flaw detection on both side surfaces of the blade implant portion of the turbine rotor can be performed at the same time, the inspection time can be shortened and the increase in the inspection cost can be suppressed. it can.

Further, according to the present invention, the ultrasonic probe is provided with a radial position adjusting means for adjusting a radial position of the turbine rotor. A turbine rotor blade implanted part ultrasonic flaw detector according to any one of the preceding claims.

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

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

Further, according to the ninth aspect, the ultrasonic probe is provided with an angle adjusting means capable of adjusting the transmission angle of the ultrasonic wave. The ultrasonic flaw detector according to claim 1 is characterized.

According to the ninth aspect of the present invention, the angle of the ultrasonic probe can be adjusted by the angle adjusting means.

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

According to the tenth aspect,
An ultrasonic wave transmitting unit for transmitting an ultrasonic wave to a blade implant portion of a turbine rotor on which a turbine blade is mounted, and an ultrasonic wave receiving unit for receiving an ultrasonic echo transmitted from the ultrasonic wave transmitting unit. An ultrasonic flaw detector having a sound wave probe and an image processing unit for converting an echo received by the ultrasonic wave receiving unit into a visible state and displaying the same on a display unit, wherein the turbine The ultrasonic transmission unit and the ultrasonic reception unit of the ultrasonic probe are arranged at different positions in the circumferential direction of the rotor, and the ultrasonic transmission is performed so that the projection area becomes large with respect to the flaw detection target. The image processing unit scans the display screen of the display unit by scanning the ultrasonic probe by moving the ultrasonic probe relatively along the circumferential direction of the turbine rotor while approaching the angle in the vertical direction. Direction orthogonal to the direction coordinate axis Is characterized in turbine rotor blade implanting portion ultrasonic testing apparatus for displaying a two-dimensional flaw detection image by setting the coordinate axis of the ultrasonic path length.

According to the tenth aspect of the present invention, the ultrasonic wave transmitted from the ultrasonic wave transmitting section of the ultrasonic probe is reflected at the flaw detection portion, and is reflected in the circumferential direction of the turbine rotor. Are received by the ultrasonic receiving units arranged at different positions.

For this reason, it is not necessary to accurately grasp the shape of the portion to be detected in advance, and the flaw can be easily detected.

According to the eleventh aspect of the present invention, the wing implant portion of the wing implant portion having a protruding shape projecting laterally from one side surface of the wing implant portion of the turbine rotor. In the flaw detection method using the ultrasonic flaw detector, the ultrasonic wave is transmitted from the ultrasonic transmitting section to the other side surface opposite to the root section, and the wing transplant located behind the root section of the wing transplant section is provided. 11. The ultrasonic inspection for a turbine rotor blade implantation part according to any one of claims 1 to 10, wherein the ultrasonic inspection is performed by reflecting the ultrasonic wave several times inside the insertion part so that the ultrasonic wave wraps around the back side of the inspection part. It is characterized by a flaw detection method using the device.

According to the eleventh aspect of the present invention, since the ultrasonic wave circulates from the back side of the flaw-detected portion and performs flaw detection, there is no side wall or the like behind the flaw-detected portion. , The defect can be accurately grasped.

According to the twelfth aspect,
The direction of the ultrasonic transmission angle of the ultrasonic probe is vertically approached to the flaw detection portion so that the projected area is increased, and the ultrasonic probe is arranged along the circumferential direction of the turbine rotor. Relative scanning, the image processing unit sets a coordinate axis of an ultrasonic path on the display screen of the display unit in a direction orthogonal to the coordinate axis in the scanning direction, and two-dimensionally detects the flaw detection image. The present invention is characterized by a flaw detection method using the ultrasonic flaw detection device for turbine rotor blade implanted parts according to claims 1 to 11 to be displayed.

According to the twelfth aspect of the present invention, when the flaw detection image is displayed in two dimensions, the coordinate axis of the path of the ultrasonic wave is set in a direction orthogonal to the coordinate axis in 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 on the same path, and is difficult to see.

However, a defect generated at a part of the flaw detection site apart from the surface layer is visually recognized on a path different from the surface of the turbine rotor and partially in the scanning direction differently from other parts. You.

For this reason, when a defect exists in the turbine rotor, it is easy to distinguish it from one having no defect, and it is easy to distinguish between rust and the like and the defect.

[0064]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 9 show Embodiment 1 of the present invention.
1 shows an ultrasonic flaw detector of a turbine rotor blade implanted portion of the present invention. Parts that are the same as or equivalent to those in the conventional example will be described with the same reference numerals.

First, the configuration will be described. As shown in FIG. 2, a turbine rotor blade implanted portion ultrasonic inspection apparatus according to the first embodiment has a bogie 1 having rollable wheels 16, 16.
7, a lifting device 18 is provided.
An arm 19 extending a predetermined length from side to side is supported so as to be able to move up and down.

At the end of the arm 19, a guide bracket 20 is provided, on which the guide rollers 20a, 20a are rotatably provided on the outer peripheral surface of the turbine rotor shaft 1c of the turbine rotor 1.

The arm 19 is provided with a motor bracket 21 at a predetermined distance from the guide bracket 20.
A ball screw 23 as a radial position adjusting means is hung between the motor bracket 21 and the motor bracket 21 so as to be rotatable.

The ball screw 23 has a substantially rectangular plate-shaped 4 so as to be positioned on one side 1a of the turbine rotor 1.
The channel probe holder 22 is screwed.

The ball screw 23 is driven to rotate by a holder driving motor 24 fixed to the motor bracket 21 and the ball screw 23
The rotation number of the ball screw 23 is counted by a position determination encoder 25 fixed to 1, and the position of the 4ch probe holder 22 in the direction in which the ball screw 23 extends is
It is configured to be measured.

The 4ch probe holder 22 has an ultrasonic transmitter and an ultrasonic transmitter for transmitting and receiving ultrasonic waves to a flaw-detected part near the second dovetail part 5 of the wing implant part 2. A first probe 27 as a receiving unit, and an ultrasonic transmitting unit and an ultrasonic receiving unit that transmit and receive ultrasonic waves to a flaw-detected portion in the vicinity of the first dovetail portion 4 of the wing implant portion 2. Two 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. The directions L1 and L2 of the ultrasonic waves transmitted from the second probes 27 and 28 are configured to coincide with the radial direction F of the turbine rotor 1, and the reflected echoes 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 match.

Further, as shown by a solid line in FIG. 1, the ultrasonic irradiation direction of the first probe 27 is approximately 45 degrees which is close to the vertical direction, and is opposite to the side surface 2a near the second dovetail portion 5.
Is aimed at.

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

In the first embodiment, the direction of ultrasonic transmission of the third probe 29 is directed to the opposite side surface 36 of the wing implant 2 as shown in FIG. Inspection site 3 near the leading edge of first dovetail portion 4
7 is provided with a predetermined angle in the ultrasonic wave transmission direction so that reflected ultrasonic waves reflected a plurality of times by the side surface including the opposite side surface 36 are applied.

The fourth probe 30 provided on the same side surface as the third probe 29 receives the ultrasonic wave reflected by the portion to be inspected.
9 and is spaced apart by a predetermined distance W1 in the circumferential direction, and the receiving surface is directed to the opposite side surface 36 of the wing implant portion 2 so that the inspection target portion 37 has an angle α at an angle α as shown in FIG. The reflected ultrasonic waves are configured to be receivable.

Further, each of the 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 this image processing device 31, each of the first, second, and fourth probes 27,
The echoes received at 28 and 30 are converted into visible states 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 of the first embodiment, first, as shown in FIG. 2, the operation of the turbine rotor 1 is stopped to detect a defect near the first dovetail portion 4. 4ch probe holder provided with the first and second probes 27 and 28 and the third and fourth probes 29 and 30 on the one side surface 1a along the extending direction of the arm portion 19 in the radial direction F of Position 22.

The direction of ultrasonic irradiation of the first probe 27 is approximately 45 degrees approximately perpendicular to the vertical direction, as shown by the dashed line in FIG.
By being directed to the flaw detection site near the second dovetail portion 5, the defect portion 35 near this flaw detection site is flawed.

The ultrasonic irradiation direction of the second probe 28 is approximately 45 degrees, which is close to the vertical direction, as indicated by a two-dot chain line in FIG. 1, and the opposite side surface 2a near the second dovetail portion 5 is formed.
The defect portion 32 near the first dovetail portion 4 is detected by the ultrasonic wave reflected once by the opposite side surface 2a.

The first probe 27 and the second probe 2
Since the directions of the ultrasonic waves L1 and L2 transmitted from the radiator 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 FIGS. The first probe 27 and the second probe 27 have a shorter distance to the flaw detection portion and are shorter than the ultrasonic waves irradiated at a predetermined angle α as in the conventional case shown in FIG. The ultrasonic wave transmitted from the probe 28 is reflected by the defective portions 35 and 32 and returns to the first probe 27 and the second probe 28.

The first probe 27 and the second probe 2
The direction of the echo reflected and returned also coincides with the radial direction F of the turbine rotor 1, so that the echo can be received at the shortest distance.

In the image processing apparatus 31, the echo 33 received by the first and second probes 27 and 28 is converted into a viewable state and displayed on the monitor apparatus 11, as shown in FIG. .

In the so-called A-scope display generally used, for example, when a defect exists 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 inspection apparatus for the turbine rotor blade implanted portion according to the first embodiment, when a defect is present in the first dovetail section 4, the two-dimensional inspection image displayed on the display screen of the monitor apparatus 11 is displayed. , And is visually recognized as shown in FIG.

That is, as shown in FIG. 2, the rust adhering to the surface of the blade implant 2 is
Since the scanning is performed while relatively moving along the circumferential direction of the turbine rotor 1, an echo having a horizontal stripe pattern in the scanning direction is displayed on the screen 11b displaying the flaw detection image in FIG. You.

The defective portion 32 is located inside the surface of the wing implant portion 2 and is formed short in the scanning direction. An echo 33 of a defective portion is displayed in a dashed manner.

For this reason, it is easy to discriminate between the rust and the like and the defect.
It is not necessary to remove... And visually inspect, and the maintenance is good.

In the first embodiment, as shown in FIG. 1, the ultrasonic wave transmission angle is set to α = approximately 45 degrees close to the vertical direction, so that the ultrasonic wave is reflected by the opposite side surface 2a. The reflected ultrasonic wave 34 also has a reflection angle α2 = about 45 degrees, and the defective portion 32 is detected.

In particular, cracks generated at the base 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 of the cracked portion may be increased. it can.

For this reason, the ultrasonic wave transmitted from the second probe 28 is further reflected by a defective portion formed in the flaw-detected portion in a short distance, and returns to the second probe 28 at the shortest distance. At the same time, the size of the flaw detection part displayed on the monitor device 11 is large, and the defect 32 is easily visible.

[0093] Even when the inspected portion near the first dovetail portion 4 which is the tip edge of the wing implant portion 2 is separated from the position of the second probe 28, the portion to be inspected is on the opposite side surface 2a. Because the reflected ultrasonic wave that was reflected once is applied,
A 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.
A length of about 5 mm and a depth of about 1.0 near the first dovetail portion 4
1 shows an artificial slit of mm. As described above, even a relatively small defect can be distinguished from rust or the like, and can be easily distinguished in a non-decomposed state.

Since the ultrasonic wave transmitted from the first probe 27 is applied directly to the part to be inspected near the opposite side surface 2a from substantially the front at an angle of about 45 degrees from the vertical direction, a shorter path is possible. Thus, a small defect portion such as a crack at the defect portion can be accurately captured.

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

As described above, when the flaw detection image is displayed in two dimensions, the coordinate axis of the path of the ultrasonic wave is set in the direction orthogonal to the coordinate axis in the scanning direction. The generated rust or the like overlaps with the echo on the surface of the turbine rotor 1 detected along the same path and is hardly visible.

However, a defect that is generated in a part of the flaw detection site away from the surface layer, that is, a slit-like defect formed in the defective portions 32 and 35 of the first embodiment, In a different path and in the scanning direction, partly different from other parts, the image is displayed as an echo on the screen of the monitor device 11 of the image processing device 31 and can be visually recognized.

For this reason, when a defect exists in the turbine rotor 1, it is easy to distinguish it from one having no defect, and it is easy to discriminate between rust and the like.

In the first embodiment, since the first and second probes 27 and 28 individually have transmission and reception functions, the number of probes can be reduced, and an increase in manufacturing cost can be suppressed.

Next, in the first embodiment, in order to improve the flaw detection accuracy, by rotating the holder drive motor 24, the 4ch probe holder 22 is screwed into the ball screw 23 in the radial direction F. Along the direction of the center O of the turbine rotor 1.

The moving distance is determined by the position measuring encoder 25.
Thus, 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 the predetermined position (the distance r1 in FIG. 2 tip)
Stopped at

In the first embodiment, the third and fourth probes 29 and 30 are mounted on the 4ch probe on which the first and second probes 27 and 28 are mounted.
Using the four probes 29 and 30, flaw detection can be performed again by a so-called pitch catch method. For this reason, a defect that is difficult to be detected by only the first and second probes 27 and 28 can be simultaneously verified by the third and fourth probes 29 and 30, so that a more accurate inspection can be performed in a short time.

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

Further, in the first embodiment, the four-channel 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 four-channel probe holders is 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 along the circumferential direction. In this case, it is possible to simultaneously inspect the flaw detection sites on both sides. I can do it.

In the ultrasonic inspection apparatus using the turbine rotor blade implantation section and the inspection method using the apparatus, the ultrasonic transmission direction of the third probe 29 as the ultrasonic transmission section is set as shown in FIG. The 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 wing implant portion 2 by directing it toward the opposite side surface 36 of the wing implant portion 2. Since the signal is received by the fourth probe 30 on the same side as the third probe 29, the side 3 including the opposite side 36
The inspected part 37 is reflected by reflected ultrasonic waves reflected a plurality of times at 8 or the like.
Even if the first and second probes 27 and 28 cannot be brought close to each other.

[0107]

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

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

In the ultrasonic inspection apparatus and the inspection method using the turbine rotor blade implanted portion of the first modification, the first probe 27 and the second probe 27 are attached to the 4ch probe holder 22 located on one side of the turbine rotor 1. The probe 28 is provided at a position different in the circumferential direction, and is further offset in the front and rear directions in the radial direction, and the third probe 29 and the fourth probe 30 are provided at a predetermined angle α (α = 2 to 3
Degree) is set as ultrasonic transmission angle and reflection angle,
A total of four are arranged so as to be spaced apart from each other 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.

According to the first modification, in addition to the function and effect of the first embodiment, in addition to the first probe 27 and the second probe 28, the third probe 29 Since the four probes 30 are arranged in parallel in the radial direction at a predetermined angle α (α = 2 to 3 degrees) as an ultrasonic wave transmission angle and a reflection angle, the first probe 27 and the second probe 28 Defects in the inspected part that have not been detected are detected by the third probe 29 and the fourth probe 30.
Are simultaneously detected by the pitch catch method using

Therefore, the flaw detection time can be reduced, and
There is no need to accurately grasp the tree shape in advance, and flaw detection can be performed with good accuracy.

[0113]

[Modification 2] FIG. 11 shows Modification 2 of Embodiment 1 of the present invention.

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

In the ultrasonic flaw detecting device and the flaw detecting method using the turbine rotor blade implanted portion according to the second modification, the first probe 27 and the second probe 27 are attached to the 4ch probe holder 22 located on one side of the turbine rotor 1. A probe 28 is provided, and a third probe 29 and a fourth probe 30 are provided on a 4ch probe holder 122 located on the other side surface of the turbine rotor 1 so as to be offset in front of and behind in the radial direction. Are located.

The third probe 2 according to the first modification
The ninth and fourth probes 30 transmit and receive ultrasonic waves independently,
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.

According to the second modification, in addition to the operation and effect of the first embodiment, the third probe 29 and the fourth probe 30 further detect a defect at the inspection site on the opposite side. I do.

For this reason, flaw detection with higher accuracy can be performed.

[0120] Other configurations, functions and effects are the same as or equivalent to those of the first embodiment, and therefore description thereof is omitted.

[0121]

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

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

In the ultrasonic inspection apparatus and the inspection method using the turbine rotor blade implanted part according to the second embodiment, as shown in FIG. 12, a turbine whose side surface 101a has a gradient of β = about 20 degrees, as shown in FIG. First dovetail portion 4 of rotor 101
Root 4b and Root 5b of Second Dovetail 5
Are formed with artificial slits 41 and 42 each having a depth of about 1.0 mm and a length of about 5.0 mm.

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

As shown in FIG. 13, in the second embodiment, a first ultrasonic probe 39 for flaw-detecting the first dovetail portion 4 is provided on the side surface 101a,
As shown in FIG. 4, a second ultrasonic probe 40 for flaw-detecting the second dovetail section 5 is provided with a first ultrasonic probe 39 for flaw-detecting the first dovetail section 4 in front and rear in the radial direction. They are offset so that they are located on the same side surface 101a.

In the first and second ultrasonic probes 39 and 40 of the second embodiment, substantially box-shaped cases 39b and 40b
The first and second probes 39a and 40a, which also function as an ultrasonic transmitting unit and an ultrasonic receiving unit, are fitted so that the angles can be freely set.

[0127] In the second embodiment, the inspected site where the artificial slits 41 and 42 are formed is
It is fitted to the cases 39b and 40b 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 Embodiment 2 configured as described above,
As shown in FIG. 13, the ultrasonic wave transmitted from the ultrasonic probe 39 is first reflected on the opposite side surface 2 a of the wing implant 2, and the first ultrasonic probe 39 is arranged. The first dovetail portion 4 enters the protrusion 4c of the first dovetail portion 4 beyond the flaw detection site.

In the ridge 4c, the ultrasonic wave is reflected a plurality of times on the inner side surfaces of the walls 4d and 4e in the ridge 4c, and the ultrasonic wave is reflected at the flaw detection site where the artificial slit 41 is formed. Turn around from behind.

As described above, since the ultrasonic wave circulates from the rear wall portion 4e to detect the flaw-detected portion where the artificial slit 41 is formed, the artificial slit 41 is located behind the artificial slit 41 in the ultrasonic irradiation direction S1. , No side walls or the like exist.

Therefore, two graphs G in the upper part of FIG.
As shown in FIG. 1 and G2, in contrast of the A-scope image,
The defect can be accurately caught by the peak P1 of the echo, which cannot be seen in the right-side graph G2 in which the sound portion is inspected and is seen in the left-side graph G1 that captures the artificial slit 41.

As shown in the lower graph G3 of FIG. 16, an echo image P2 clearly different from the other healthy parts is projected on the monitor device 11 of the image processing device 31 and visually recognized even in the image of the B scope. It is possible to accurately grasp defects.

Further, as shown in FIG. 14, the ultrasonic probe sound wave transmitted from the ultrasonic probe 40 is directly transmitted to the ultrasonic probe as shown in an enlarged view surrounded by a chain line in FIG. 2
The dovetail portion 5 enters the ridge portion 5c. In the protruding portion 5c, the ultrasonic wave is reflected by the walls 5d and 5e a plurality of times, so that the ultrasonic wave enters so as to irradiate the flaw-detected portion where the artificial slit 42 is formed from behind. Then, flaw detection is performed.

As described above, since the ultrasonic wave circulates from the back side of the flaw-detected portion where the artificial slit 42 is formed and flaws are detected, there is no side wall or the like behind the artificial slit 42 S2.

For this reason, the two graphs G in the upper part of FIG.
As shown in FIGS. 4 and G5, in contrast of the A-scope image,
Although no echo is visible in the right-side graph G5 where the sound portion is inspected, the peak P3 of the echo is projected on the monitor device 11 of the image processing device 31 and can be visually recognized in the left-side graph G4 capturing the artificial slit 42.

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

In the second embodiment, the first and second probes 39a, 39a, which also serve as an ultrasonic transmitting unit and an ultrasonic receiving unit, are provided in the substantially box-shaped cases 39b, 40b.
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 the inspection can be performed with good accuracy.

[0139] Other configurations, functions and effects are the same as or equivalent to those of the first embodiment, and a 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.

The ultrasonic flaw detecting device and the flaw detecting method using the device according to the third embodiment are shown in FIG.
As shown in FIG. 8, a slit 43 is formed along the wall 4e at the side end in the inspection target portion in the ridge portion 4c of the first dovetail portion 4.
This is used when is formed.

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

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

In Embodiment 3 configured as described above,
As shown in FIG. 18, the ultrasonic wave transmitted from the first probe 27 is first reflected on the opposite side surface 2 a of the wing implant portion 2, and then the distal end wall portion of the wing implant portion 2 is formed. The light is reflected by 4d and enters into the ridge 4c of the first dovetail portion 4 on the side where the first probe 27 is provided.

In the protruding ridge 4c, the ultrasonic wave is applied to the slit 43 of the inspected portion from substantially the front with a wide projected area.

[0147] Other configurations, functions and effects are the same as or equivalent to those in the first and second embodiments, and a description thereof will be 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 detecting device and the flaw detecting method using the turbine rotor blade implanted portion of the fourth embodiment, the ultrasonic irradiation direction of the first probe 27 is about 45 degrees which is close to the vertical direction. The configuration directed to the opposite side surface 2a near the second dovetail portion 5 is substantially the same as that of the first embodiment.

In the fourth embodiment, as shown in FIG. 19, from the radial direction F of the turbine rotor 1, an irradiation direction of about β ゜ = 10 to 20 ° is swung in the scanning direction in the plane of the rotor disk surface, and the ultrasonic wave is applied. Is irradiated.

The other configuration, operation, and effect are the same as or equivalent to those of the first to third embodiments, and thus description thereof is omitted.

Although the first to fourth embodiments and the first or second modification of the present invention have been described 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 a range that does not change the gist of the present invention, it is included in the present invention.

For example, in the first embodiment, the 4ch probe holder 22 on which the first and second probes 27 and 28 are mounted
Although the third and fourth probes 29 and 30 are mounted on one side of the probe, the present invention is not particularly limited thereto. For example, the number, shape, and performance of the probes are not particularly limited, such as providing transmission and reception probes on both sides. Absent.

Also, in the first embodiment, the first and second
The ultrasonic irradiation directions of the probes 27 and 28 are directed to the opposite side surface 2a in the vicinity of the second dovetail portion 5 at about 45 degrees as shown by the alternate long and short dash line in FIG. Not limited to this, if it is approximated in the vertical direction, it is set so that the projection area of the defect at the flaw detection site becomes large within the range of about 0 to about 60 degrees, preferably about 0 to about 45 degrees. It is natural that what is done is good.

[0156]

As described above, according to the first aspect of the present invention,
The direction of the ultrasonic wave transmitted from the ultrasonic wave transmitting unit and the direction of the reflected echo coincide with the radial direction of the turbine rotor, so that the distance to the flaw detection portion is reduced. Short, compared to the ultrasonic waves that are given and given a predetermined angle α, as in the related art, the ultrasonic waves transmitted from the ultrasonic transmitting unit are reflected at a defective portion in a short path, It returns to the ultrasonic receiver at the shortest distance.

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

[0158] In the two-dimensional flaw detection image displayed on the display screen of the display section, rust attached to the surface of the blade implant section causes the ultrasonic probe to move along the circumferential direction of the turbine rotor. Since they are relatively moved and scanned, they are represented in a horizontal stripe pattern in the scanning direction.

The defective portion is located inside the surface of the wing-implanted portion and is formed short in the scanning direction, so that the defective portion is stepped at a position shifted from the horizontal stripe pattern. A partial echo is displayed.

For this reason, it is easy to discriminate between the rust and the like and the defect, and it is not necessary to remove the turbine blade from the turbine rotor during inspection and visually inspect it, thereby improving the maintainability.

According to the second aspect of the present invention, the projection area becomes larger with respect to the flaw-detected portion by setting the ultrasonic wave transmission angle close to the vertical direction.

For this reason, the ultrasonic wave transmitted from the ultrasonic wave transmitting section in a short distance is reflected by the defective portion,
While returning to the ultrasonic receiving unit at the shortest distance, the size of the flaw-detected portion displayed on the display unit is large and easy to visually recognize.

[0163] According to the third aspect,
The part to be inspected near the tip edge of the blade implant is separated from the ultrasonic wave transmitting part, for example, even near the tip of the blade implant of the turbine rotor, once on the opposite side surface. Since the reflected reflected ultrasonic waves are applied, a defective portion formed along the radial direction of the turbine rotor is 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 the ultrasonic probe is applied to the inspection site, even if the ultrasonic probe cannot be brought close to the inspection site, it can be captured with a large projected area.

According to the fifth aspect of the present invention, since the ultrasonic wave is applied directly to the inspected portion near the side surface opposite to the ultrasonic wave transmitting section, the defective portion can be accurately detected in a shorter path. Can be captured.

[0166] 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 at different incident angles, even a defective portion that is difficult to detect with a single ultrasonic probe can be used. Detection is possible, and flaw detection can be performed with better accuracy.

According to the seventh aspect of the present invention, since the flaw detection of both side surfaces of the blade implant portion of the turbine rotor can be performed at the same time, the inspection time can be shortened and the increase in the inspection cost can be suppressed.

Further, according to the present invention, the radial position of the ultrasonic probe is adjusted by the radial position adjusting means.

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

[0170] According to the ninth aspect, the angle of the ultrasonic probe can be adjusted by the angle adjusting means.

[0171] Therefore, the ultrasonic probe can be directed to an angle at which a defective portion can be more accurately captured, and flaw detection with good accuracy can be performed.

Further, according to the tenth aspect,
Ultrasonic waves transmitted from the ultrasonic transmitter of the ultrasonic probe are reflected at the flaw detection site and received by the ultrasonic receivers disposed at different positions in the circumferential direction of the turbine rotor. .

For this reason, it is not necessary to accurately grasp the shape of the flaw detection site in advance, and flaw detection can be easily performed.

According to the eleventh aspect, since the ultrasonic wave circulates from the back side of the flaw-detected portion and performs flaw detection, no side wall or the like exists behind the flaw-detected portion.
Defects can be accurately grasped.

[0175] According to the twelfth aspect,
When the flaw detection image is displayed in two dimensions, since the coordinate axis of the path of the ultrasonic wave is set in a direction orthogonal to the coordinate axis of the scanning direction, rust or the like generated on the surface of the turbine rotor is the same path. Overlaps with the surface of the turbine rotor detected by the above, and is difficult to see.

[0176] However, a defect generated in a part of the flaw detection site apart from the surface layer is visually recognized on a path different from the surface of the turbine rotor, and partially in the scanning direction differently from other parts. You.

For this reason, when a defect is present in the turbine rotor, it is possible to easily distinguish the defect from the turbine rotor having no defect, and it is easy to discriminate the defect from rust or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a turbine rotor blade implanted portion ultrasonic inspection apparatus according to Embodiment 1 of the present invention at a position along a radial direction of a blade implanted portion of a turbine rotor.

FIG. 2 is a side view illustrating a state in which flaw detection is performed on the turbine rotor using the turbine rotor blade implanted portion ultrasonic inspection device in the turbine rotor blade implanted portion ultrasonic inspection device of the first embodiment. FIG.

FIG. 3 is a side view of a blade implant portion of the turbine rotor in the ultrasonic inspection device for the turbine rotor blade implant portion of the first embodiment.

FIG. 4 is a graph drawn by a general A scope, and is a schematic diagram illustrating a state in which a defect is captured.

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

FIG. 6 is a graph drawn by a B scope in the turbine rotor blade implanted ultrasonic inspection device of the first embodiment;
FIG. 9 is a schematic diagram illustrating a state where a defect near a first dovetail portion is captured.

FIG. 7 is a graph drawn by a B scope in the turbine rotor blade implanted portion ultrasonic inspection device according to the first embodiment;
FIG. 9 is a schematic diagram illustrating a state in which a defect near a second dovetail portion is captured.

FIG. 8 is a schematic diagram showing the positional relationship between the outer surface of the turbine rotor and each probe in the ultrasonic inspection apparatus for a turbine rotor blade implanted portion and the inspection method using the apparatus according to the first embodiment.

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

FIG. 10 is a schematic diagram illustrating an arrangement of probes in a first modification of the first embodiment.

FIG. 11 is a schematic diagram illustrating an arrangement of probes according to a second modification of the first embodiment.

FIGS. 12A and 12B show a turbine rotor blade implanted portion ultrasonic flaw detection device and a flaw detection method using the device according to the second embodiment.
FIG. 2B is a side view of the blade implant portion of the turbine rotor, and FIG. 2B is a cross-sectional view at a position along a radial direction.

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

FIG. 14 is a cross-sectional view at a position along a radial direction explaining an inspection near a second dovetail portion in the second embodiment.

FIG. 15 is a side view of the blade implant portion of the turbine rotor for explaining an inspection near 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 an inspection near the first dovetail portion in the second embodiment.

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

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

FIG. 19 is a side view of a blade implant 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 a turbine blade is mounted on a blade implant portion in a conventional turbine rotor.

FIG. 22 is a conceptual diagram showing a state of flaw detection at a shallow angle of incidence in a conventional turbine rotor blade implantation part ultrasonic flaw detection apparatus.

FIG. 23 is a graph drawn by an A scope in one conventional turbine rotor blade implanted ultrasonic inspection device, and FIG.
FIG. 7 is a schematic diagram illustrating a state in which a defect near a dovetail portion is captured.

FIG. 24 is a schematic diagram showing a normal state in a graph drawn by an A scope in one conventional ultrasonic inspection device for turbine rotor blade implantation part.

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

FIG. 26 is a side view of a blade implant portion of a turbine rotor for explaining an arrangement of a probe employing a pitch catch method in another conventional turbine rotor blade implant portion ultrasonic inspection device.

FIG. 27 is a front view of a blade implant portion of a turbine rotor for explaining an arrangement of a probe employing a pitch catch method in another conventional turbine rotor blade implant portion ultrasonic inspection device.

FIG. 28 is a graph showing an example of a B-scope image drawn by a pitch catch method in another conventional ultrasonic inspection device for turbine rotor blade implantation part.

FIGS. 29A and 29B show a trapped defect and a non-trapped defect in another conventional turbine rotor blade implanted ultrasonic inspection device, and FIG. 29A shows a state in which the first dovetail portion is completely missing. Sectional drawing, (b) is a sectional view showing a state where the first dovetail part is partially missing, (c) is a sectional view showing a state where one side hook part of the first dovetail part is completely missing, ( d)
Is a cross-sectional view showing a state in which one side hook portion of the first dovetail portion is partially cut off, and (e) is a cross-sectional view showing a state in which a crack is generated at a root portion of the one side hook portion of the first dovetail portion. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,101 Turbine rotor 1a One side 1b Other side 2 Blade implantation part 3 Turbine blade Turbine rotor blade implantation part Ultrasonic flaw detector 11 Monitor device (display part) 27 First probe 28 Second probe 29 Third probe (Super Sound wave transmitting unit) 30 fourth probe (ultrasonic wave receiving unit) 31 image processing device (image processing unit) 32, 35 defective part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Norihide Matsumura 2109-8 Yajima Nishimachi, Takamatsu City, Kagawa Prefecture Inside Shikoku Research Institute, Inc. (72) Inventor Shinichi Tsuji 4-10-13 Ibori, Kokurakita-ku, Kitakyushu-shi, Fukuoka New Japan Non-Destructive Inspection Co., Ltd. (72) Inventor Naofumi Haneda 4-10-13, Ibori, Kokurakita-ku, Kitakyushu-shi, Fukuoka New Japan Non-Destructive Inspection Co., Ltd. F-term (reference) DB03 DB10 GG47

Claims (12)

[Claims] An ultrasonic transmitter for transmitting an ultrasonic wave to a blade implantation portion of a turbine rotor on which a turbine blade is mounted, and
An ultrasonic probe having an ultrasonic receiver that receives an ultrasonic echo transmitted from the ultrasonic transmitter; and a display unit that converts the echo received by the ultrasonic receiver into a visible state. And an image processing unit that displays the direction of the ultrasonic wave transmitted from the ultrasonic transmission unit and the direction of the reflected echo in the radial direction of the turbine rotor. While arranging the ultrasonic probe so as to match,
By performing relative scanning with the ultrasonic probe along the circumferential direction of the turbine rotor and scanning, in the image processing unit, on a display screen of the display unit, in a direction orthogonal to a coordinate axis in a scanning direction. An ultrasonic inspection apparatus for setting a coordinate axis of an ultrasonic path and displaying a two-dimensional inspection image. 2. The ultrasonic probe is arranged on one side surface of the turbine rotor and at an ultrasonic transmission angle close to a vertical direction so as to increase a projection area with respect to a portion to be detected. 2. The ultrasonic flaw detector according to claim 1, wherein: 3. An ultrasonic transmission direction of the ultrasonic transmission section is directed to the side surface opposite to the wing implantation portion, so that the inspection portion near the tip end edge of the wing implantation portion has the opposite side surface. The ultrasonic flaw detector according to claim 1 or 2, wherein the ultrasonic waves reflected once are applied. 4. An ultrasonic transmission direction of the ultrasonic transmission section is directed to the side surface opposite to the wing implantation portion, so that the inspection side near the tip edge of the wing implantation portion is opposed to the opposite side surface. The ultrasonic flaw detector according to claim 1 or 2, wherein the ultrasonic waves reflected a plurality of times on the side surface including the following are applied. 5. An ultrasonic transmission direction of the ultrasonic transmission unit is directed to a side opposite to a side surface on which the ultrasonic transmission unit is disposed, so that an ultrasonic wave is directly transmitted to a portion to be inspected near the opposite side surface.
The ultrasonic flaw detector according to claim 1, wherein ultrasonic waves are applied. 6. The ultrasonic probe according to claim 1, wherein said ultrasonic probe detects a portion to be inspected in the vicinity of a distal end edge of said wing implant portion, and an ultrasonic probe which detects a portion to be inspected in the vicinity of said opposite side surface. 2. An ultrasonic probe having a part ultrasonic probe, wherein a total of four tip ultrasonic transducers and one or more neighboring ultrasonic probes are disposed on one side surface of the turbine rotor. 6. The ultrasonic flaw detector according to claim 1, wherein: 7. The ultrasonic probe according to claim 1, wherein said ultrasonic probe detects a portion to be inspected in the vicinity of a distal end edge of the wing implant portion, and a ultrasonic probe which detects a portion to be inspected in the vicinity of said opposite side surface. And a tip ultrasonic probe and a neighboring ultrasonic probe are provided on both side surfaces of the turbine rotor, and a total of four ultrasonic probes are arranged. Item 6. The ultrasonic inspection equipment for a turbine rotor blade implanted section according to any one of Items 1 to 5. 8. The ultrasonic probe according to claim 1, further comprising a radial position adjusting means for adjusting a radial position of the turbine rotor. Item 7. An ultrasonic flaw detector according to the above item. 9. The turbine according to claim 1, wherein said ultrasonic probe is provided with an angle adjusting means capable of adjusting an ultrasonic wave transmission angle. Ultrasonic flaw detector for rotor blade implant. 10. An ultrasonic transmitting section for transmitting an ultrasonic wave to a blade implantation section of a turbine rotor on which a turbine blade is mounted, and an ultrasonic wave for receiving an echo of the ultrasonic wave transmitted from the ultrasonic transmitting section. An ultrasonic probe having an ultrasonic probe having a receiving unit and an image processing unit for converting an echo received by the ultrasonic receiving unit into a viewable state and displaying the image on a display unit In the device, an ultrasonic transmitter and an ultrasonic receiver of the ultrasonic probe are arranged at different positions in a circumferential direction of the turbine rotor,
Moreover, the ultrasonic probe is moved vertically along the circumferential direction of the turbine rotor by moving the ultrasonic transmission angle vertically close to the flaw detection portion so that the projected area becomes large. By doing so, in the image processing unit, on the display screen of the display unit, in the direction orthogonal to the coordinate axis in the scanning direction, set the coordinate axis of the path of the ultrasonic wave, and display the flaw detection image two-dimensionally, Flaw detector for turbine rotor blades. 11. A flaw detecting method using an ultrasonic flaw detector for a wing implanted part of a wing implanted part projecting laterally from one side surface of the wing implanted part of the turbine rotor. On the other side opposite to the root, transmitting the ultrasonic wave from the ultrasonic transmitter, and by reflecting several times in the wing implant located behind the root of the wing implant, 11. The flaw detection using the turbine rotor blade implanted part flaw detection apparatus according to any one of claims 1 to 10, wherein flaw detection is performed by wrapping the ultrasonic wave around the flaw detection part. Method. 12. The ultrasonic probe according to claim 1, wherein an ultrasonic transmission angle direction of said ultrasonic probe is vertically approached to a flaw-detected portion so as to increase a projection area, and said ultrasonic probe is connected to said turbine rotor. By performing relative scanning along the circumferential direction and scanning, the image processing unit sets a coordinate axis of an ultrasonic path in a direction orthogonal to a coordinate axis of a scanning direction on a display screen of the display unit, and performs flaw detection. 12. The flaw detection method according to claim 1, wherein the image is displayed two-dimensionally.