JPH08160022A - Two-vibrator probe - Google Patents

Abstract

PURPOSE: To provide a two-vibrator probe in which the quantity of wedge members to be prepared is reduced to facilitate the management and the processing operation of the members is alleviated. CONSTITUTION: The two-vibrator probe comprises a transmitting probe 2 for transmitting an ultrasonic wave for bringing a wedge member 7 into close contact with a vibrator assembly 5, a receiving probe 3 for receiving the wave to bring a vibrator assembly 6 into close contact with a wedge member 8. The members 7, 8 have main wedge members 10, 11 in which oblique surfaces 10a 11a in close contact with the oblique surfaces 5d, 6d of the assemblies 5, 6 are on one side and flat surfaces 10b, 11b are on the other side, and sub- wedge members 12, 13 in which the one sides are brought into close contact with the flat surfaces 10b, 11b of the members 10, 11 and the other sides are formed into contact curved surfaces 12b, 13b conforming to the damage surface of an element 16.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a two-element transducer.

[0002]

2. Description of the Related Art As a probe for detecting a defect in a material (metal such as steel or non-metal) by ultrasonic flaw detection, a two-transducer type for the purpose of flaw detection on the surface layer portion There is a probe. In a normal single probe, transmission and reception are performed by one transducer, so the transmission wave is received at the same time as the transmission, and a signal such as a defect cannot be detected while the transmission wave is being transmitted. . In the two-transducer probe, as shown in FIGS. 5 and 6, the transmitting probe 5 is provided on both sides of the acoustic separating plate 50.
1 and the receiving probe 52 are arranged, and the respective probes 51, 52 are arranged.
By adopting a two-vibrator type in which the vibrators 53 and 54 are provided, the signal can be detected immediately after the transmission.

When the flaw detection surface of the object to be inspected is a curved surface, for example, a cylindrical surface, in the two-transducer probe, the acoustic delay of each probe 51, 52 is made so that ultrasonic waves are efficiently transmitted into the material. The contact surfaces of the wedge members 55 and 56, which are materials, need to be cylindrical surfaces that match the surface state of the flaw detection surface. That is, when performing flaw detection from the inner surface of the hole of the cylindrical inspection object, it is necessary to match the curvature of the flaw detection surface with the curvature of the wedge members 55 and 56. It is necessary to perform processing to match the curvature with the cylindrical surfaces of 55 and 56. Therefore, in general, the oscillator 5
Prepared by separately forming the parts of the vibrator assemblies 57 and 58 having the parts 3, 54 and the parts of the plastic wedge members 55 and 56, and processing the contact surfaces of the wedge members 55 and 56 into various curvatures. Then, only the wedge members 55 and 56 are replaced with new ones that match the curvature of the flaw detection surface, so as to correspond to ultrasonic flaw detection of the inspection object of various curvatures.

Further, since the two-transducer probe is intended to detect defects in the surface layer of the object to be inspected, a plurality of short focal lengths are required. Therefore, the transducers 53 and 54 are respectively provided with a predetermined tilt angle (3 to 12 °) so that the ultrasonic beams are directed inward, and the transducer assemblies 57 and 58 and the wedge members 55 and 56 are closely attached to each other. Has a similar angle. And this inclination angle (3 to 12 °) is
It is necessary to provide a plurality of types according to the focal length of the ultrasonic beam.

Thus, the wedge member 55,
When processing the contact surface of 56, when making a new wedge member that has been reduced in thickness due to this processing being performed multiple times, adjust the contact surface processing and the oscillator to match the flaw detection surface of the wedge member. It is necessary to process the inclined surface. Further, when a plurality of types of wedge members 55 and 56 are used for the flaw detection surface of various inspection objects, a plurality of inclination angles (3 to
12 °) for each wedge member 55, 5 having a plurality of curvatures.
6 is required, and a large number of wedge members 55 and 56 must be prepared.

However, if the contact surfaces of the wedge members 55 and 56 are processed, machining work is frequently required and complicated, and various kinds of wedge members 55 and 56 are required.
However, there is a technical problem in that not only the processing for the preparation is complicated but also the management is complicated by preparing and responding.

[0007]

The present invention has been made in view of such conventional technical problems, and has the following structure. According to the configuration of the invention of claim 1, the transmitting probe 2 having the transmitting probe 2 and the receiving probe 3 and transmitting the ultrasonic wave is provided in the transducer assembly 5 having the transducer 5b. The reception probe 3 for closely contacting the wedge member 7 and receiving ultrasonic waves is a two-transducer probe for closely adhering the wedge member 8 to the transducer assembly 6 having the transducer 6b. 7 and 8 are inclined surfaces 5d and 6 of the vibrator assemblies 5 and 6, respectively.
A main wedge member 10, 1 having inclined surfaces 10a, 11a closely adhering to d on one side and flat surfaces 10b, 11b on the other side.
1 and the flat surface 10b of the main wedge members 10 and 11 on one side,
Contact planes 12b, 13 which form flat surfaces 12a, 13a which are in close contact with 11b and whose other side conforms to the flaw detection surface of the inspection object 16
A two-transducer probe having sub wedge members 12 and 13 forming b. According to a second aspect of the invention, each transducer assembly 5, 6, a main wedge member 10,
11. The two-transducer probe according to claim 1, wherein 11 and the sub-wedge members 12 and 13 are connected by detachable connecting members 14 and 15.

[0008]

According to the invention of claim 1, the contact curved surfaces 12b, 13 of the sub wedge members 12, 13 are attached to the flaw detection surface of the inspection object 16.
b is brought into close contact, and an ultrasonic flaw detection test is performed on the inspected object 16 using a two-element transducer. The ultrasonic wave transmitted from the transducer 5b of the transducer assembly 5 of the transmitting probe 2 passes through the wedge member 7 and enters the inspection object 16, and the reflected wave passes through the wedge member 8 and the receiving probe. The oscillator 6b of the child 3 receives the C.I. R. T. Is displayed in. Then, the vibrator 5b,
The same test is performed at each focal length by changing the inclination angles of the inclined surfaces 5d and 6d to which 6b is attached. At this time, the vibrator assemblies 5 and 6 and the main wedge members 10 and 11 are exchanged with those having predetermined inclined surfaces 5d, 6d, 10a and 11a to give a predetermined focal length, but the sub wedge member 1
2 and 13 can be used as they are for the inspection object 16 having a matching flaw detection surface.

On the other hand, when performing an ultrasonic flaw detection test on different flaw detection surfaces of the object 16 to be inspected, the sub wedge member 1 is used.
2 and 13 are replaced with those having suitable contact curved surfaces 12b and 13b, but inclined surfaces 5d, 6d and 10 having various inclination angles
The vibrator assemblies 5 and 6 having a and 11a and the main wedge members 10 and 11 can be used as they are. Thus, the inclined surfaces 5d, 6d, 10a, 11 having various inclination angles are formed.
vibrator assembly 5 and 6 having a and main wedge member 1
It is possible to prepare sub-wedge members 12 and 13 having contact curved surfaces 12b and 13b of 0 and 11 and a plurality of types, and perform an ultrasonic flaw detection test at various focal lengths on the inspection object 16 having different flaw detection surfaces. it can.

According to the invention of claim 2, the vibrators 5b, 6
When the inclination angles of the inclined surfaces 5d and 6d to which b is attached are changed one after another, the coupling tools 14 and 15 are detached and the vibrator assemblies 5 and 6, the main wedge members 10 and 11 and the sub wedge members 12 and 13 are removed. After separating, the vibrator assemblies 5 and 6 and the main wedge members 10 and 11 are provided with predetermined inclined surfaces 5d, 6d and 10
Replace with those having a and 11a. Also, the inspection object 1
When performing an ultrasonic flaw detection test on six different flaw detection surfaces, the contact curved surface 12 that fits the sub wedge members 12 and 13 is used.
Replace it with that of b, 13b, but at that time also connecter 1
4, 15 are removed to separate the vibrator assemblies 5, 6 and the main wedge members 10, 11 from the sub wedge members 12, 13.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates a two-transducer probe used in an ultrasonic flaw detection test, and the two-transducer probe 1 includes a transmitting probe 2, a receiving probe 3, and both probes. The acoustic separator 4 is interposed between the tentacles 2 and 3. Each probe 2, 3 includes a transducer assembly 5, 6 and a wedge member 7, 8. Each vibrator assembly 5, 6 includes a damper 5a, 6a, a vibrator 5b,
The transducers 5b and 6b have electrodes on both sides, and exchange electric signals with the connecting connectors 5c and 6c.

The dampers 5a and 6a are oscillators 5b and 6b.
Of the oscillators 5b, 6b, which has a function of absorbing the resonance of the
The mounting surface and the transducers 5b and 6b form flat predetermined inclined surfaces 5d and 6d. Each transducer assembly 5, 6
A plurality of inclined surfaces 5d and 6d having different angles are prepared and replaced according to the focal length. Inclined surface 5d,
6d has angles of 3 °, 6 °, and 12 °, for example. 3 °
The inclined surfaces 5d and 6d of 6 have an infinite focal length,
The inclined surfaces 5d and 6d of ° have a focal length of 25 mm, and
The 2 ° inclined surfaces 5d and 6d have a focal length of 10 mm. The wedge members 7 and 8 are made of plastic and have a function as an acoustic delay material.
Are arranged symmetrically on both the left and right sides of. The acoustic separating plate 4 has a function of blocking surface waves.

Each wedge member 7, 8 has a main wedge member 10, 11 and a sub wedge member 12, 13.
The main wedge members 10 and 11 have inclined surfaces 10a and 11a, which are in close contact with the inclined surfaces 5d and 6d of the vibrator assemblies 5 and 6, on one side. The sub wedge members 12 and 13 are flat surfaces 10b and 11b formed by the other side of the main wedge members 10 and 11, respectively.
The flat surfaces 12a and 13a which are in close contact with the contact surface are formed on one side, and the contact curved surfaces 12b and 13b which match the flaw detection surface of the inspection object 16 are formed on the other side. Plane 10 of the main wedge members 10, 11
b, 11b and the flat surface 12 of the sub wedge members 12, 13
It is sufficient that a and 13a are easy to process, and are given a plane orthogonal to the extending direction of the acoustic separating plate 4.

The contact surfaces 5d, 6d, 10a, 11a, 10b, 11b and 12 of the vibrator assemblies 5 and 6, the main wedge members 10 and 11 and the sub wedge members 12 and 13, respectively.
A liquid medium such as oil or grease is interposed between a and 13a, and they are brought into close contact with each other, and they are respectively coupled by screws 14 and 15 (or adhesives) which are detachable connecting tools. The contact curved surfaces 12b of the sub wedge members 12 and 13,
13b is a curved surface corresponding to the flaw detection surface of the inspection object 16,
When the inspected object 16 is a cylindrical body and the flaw detection surface is an inner diameter surface, it is a convex arc surface having a radius R adapted to the inner diameter surface. The transmitting probe 2, the receiving probe 3, and the acoustic separating plate 4 are actually accommodated in a case (not shown).

Next, the operation of the above embodiment will be described. The inspected object 16 is a cylindrical body, and the sub-wedge members 12, 1 are formed by interposing a liquid medium on the inner diameter surface, which is the flaw detection surface.
The three contact curved surfaces 12b and 13b are brought into close contact with each other. In this state, as shown in FIG. 3, an ultrasonic flaw detection test is performed on the inspection object 16 using the two-vibrator probe 1 of the pulse flaw detector. The ultrasonic waves transmitted from the transducer 5b of the transmitting probe 2 pass through the wedge member 7 and enter the inspection object 16,
The reflected wave passes through the wedge member 8 and is received by the transducer 6b of the receiving probe 3, and as shown in FIG. R. T. Waveform is displayed on the tube surface of. In the figure, A indicates a transmitted wave accompanying the passage of each wedge member 7, 8 as an acoustic delay material, and an S wave accompanying a transverse wave near the surface and a bottom echo B of the inspection object 16 appear. If the inspection object 16 has a defect, S
An abnormal portion echo C occurs between the wave and the reflected wave B.

Then, the inclination angles of the inclined surfaces 5d and 6d to which the vibrators 5b and 6b are attached are sequentially changed to the angles of 3 °, 6 ° and 12 °, and the same test is performed at each focal length. At that time, the vibrator assemblies 5 and 6 and the main wedge members 10 and 11 separated by removing the screws 14 and 15 are replaced with those having predetermined inclined surfaces 5d, 6d, 10a, and 11a. 12 and 13 can be used as they are for the object 16 to be inspected having a compatible flaw detection surface.

On the other hand, when performing an ultrasonic flaw detection test on the flaw detection surface of the object 16 to be inspected having a different inner diameter, the contact curved surfaces 12b, 13 having a radius R to which the sub wedge members 12, 13 are fitted.
Replace it with that of b, but with various tilt angles (3 °, 6 °,
The vibrator assemblies 5, 6 having the inclined surfaces 5d, 6d, 10a, 11a of 12 °), the main wedge members 10, 11 and the acoustic separating plate 4 can be used as they are. Thus, the inclined surfaces 5d, 6d, 10a, 11 having various inclination angles are formed.
vibrator assembly 5 and 6 having a and main wedge member 1
By preparing the sub wedge members 12 and 13 having contact curved surfaces 12b and 13b of 0 and 11 and a plurality of types, the ultrasonic flaw detection test can be performed on the inspection object 16 having different inner diameters.

By the way, in the above-described embodiment, the case where the ultrasonic flaw detection test is performed on the inspected objects 16 having different inner diameters has been described, but the inspected object 16 is formed on the contact curved surfaces 12b and 13b of the sub wedge members 12 and 13. The present invention can be similarly applied to the object 16 to be inspected, which has various curved surfaces including a cylindrical surface, by providing a curved surface that is compatible with the flaw detection surface. Also,
Although the oscillator assemblies 5, 6 and the main wedge members 10, 11 and the sub wedge members 12, 13 are integrally connected by the screws 14, 15, the oscillator assemblies 5, 6 and the main wedge members 10, 11 are integrated. Are treated as one. Therefore, the vibrator assemblies 5 and 6 and the main wedge members 10 and 11 forming a pair are always coupled by a connecting tool, and the main wedge members 10 and 1 are connected.
It is also possible to connect between 1 and the sub wedge members 12 and 13 by a detachable connecting tool.

[0019]

As can be understood from the above description,
According to the present invention, each wedge member is divided into two to form a main wedge member having an inclined surface in close contact with the inclined surface of each transducer assembly, and a flat surface having one side in close contact with the plane of the main wedge member, and the other. The side is composed of an auxiliary wedge member that forms a contact curved surface that matches the flaw detection surface of the inspection object. As a result, the number of wedge members to be prepared is reduced, management is facilitated, and the work of processing wedge members is reduced. In addition, the main wedge member requires difficult processing only on the inclined surface, and the auxiliary wedge member requires difficult processing only on the contact curved surface, forming both the inclined surface and the contact curved surface. The wedge member can be manufactured more easily than the conventional one.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a two-vibrator probe according to one embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an explanatory view similarly showing a usage state.

FIG. 4 is a diagram showing the same test results.

FIG. 5 is a side view showing a cross section of a conventional example.

FIG. 6 is a front view of the same.

[Explanation of symbols]

1: 2 transducer probe, 2: transmission probe, 3: reception probe, 5, 6: transducer assembly, 5b, 6b: transducer, 5
d, 6d: inclined surface, 7, 8: wedge member, 10, 1
1: main wedge member, 10a, 11a: inclined surface, 10
b, 11b: plane, 12, 13: sub wedge member, 12
a, 13a: plane, 12b, 13b: contact curved surface, 14,
15: connecting tool, 16: inspected object.

Claims (2)

[Claims] 1. A transmitting probe (2) having a transmitting probe (2) and a receiving probe (3) and transmitting ultrasonic waves.
Is a transducer assembly (5) having a transducer (5b), a wedge member (7) is brought into close contact with the transducer assembly (5), and a receiving probe (3) for receiving ultrasonic waves has a transducer (6b). A two-transducer probe in which a wedge member (8) is closely attached to an assembly (6), wherein each wedge member (7, 8) has an inclined surface (5d, 6d) has an inclined surface (10a, 11a) closely attached to one side, and has a flat surface (10b, 1a).
Main wedge member (10, 11) having 1b) on the other side
And one side is the plane (10) of the main wedge member (10, 11).
Sub wedge member (1) forming flat surfaces (12a, 13a) that closely contact (b, 11b), and forming a contact curved surface (12b, 13b) that matches the flaw detection surface of the inspection object (16) on the other side.
2, 13), and a two-transducer probe. 2. A vibrator assembly (5, 6), a main wedge member (10, 11) and a sub wedge member (12, 13).
The two-transducer probe according to claim 1, wherein the two transducers are coupled by a detachable connector (14, 15).