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JPS57179158

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DESCRIPTION JPS57179158
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 2a are sectional views of a conventional
ultrasonic back split probe, and FIGS. 1 b and 2 are conventional ultrasonic back split probes. 3a
is a cross-sectional view of the ultrasonic back split probe according to the invention viewed from
the side, and FIGS. 3b and 4 are cross-sectional views from the front, 3C is a flaw detection
waveform diagram, FIG. 5A is a top view of the shoe, and FIG. 5 is a cross-sectional view of the
shoe. In the figure, 1 is a transmitting transducer, 2 is a transmitting delay line, 3 is a receiving
transducer, 4 is a receiving delay line, 5 is a first acoustic shield plate, 6 is a probe case, 7 is a
shoe, 8 is a test material, 9 is a water film, 10 is a transmission pulse, 11 is a surface echo, 12 is
a bottom echo, 13 is a noise echo, 14 is a second acoustic shield plate, 15 is a fixing pin, 16 is a
fixing pin It is a void. In the drawings, the same or corresponding parts are denoted by the same
reference numerals. 「−m−ぞb)(1t
[Detailed description of the invention]). 1, 2, 'Th, (1) //// y, f, J' This invention relates to the
improvement of an ultrasound segmented probe for detecting defects in a test material using
ultrasound. First, a conventional ultrasonic split probe will be described with reference to FIGS. 1
(−), (n and FIGS. 2 (,), (d). 1 (a) and 2 (()) are cross-sectional views of a conventional ultrasonic
split probe, and FIG. 1 ((a) and FIG. 2 (showing a flaw detection waveform (moscope)). 1 () and 2
(a), (1) is a transmitting transducer, (2) is a transmitting delay line, (3) is a receiving transducer,
(4) is a receiving delay line, (5) is an acoustic shield plate made of cork material, (6) is a probe
case, (7) is a shoe for forming a water film (9), (8) is a test material, and (9) is a water belly It is.
In FIG. 1 (#, FIG. 2 (b), 鱒 is a transmission pulse. a is an echo on the surface, a is a bottom echo,
and a is a noise echo on the surface. By the way, between the delay lines (2) and (4) of the
ultrasonic split probe and the test material (8), usually by means of the shoe (7) for wear of the
probe, stability of acoustic coupling and the like. (2) A gap of about 23 鰭 about 05 鰭 is
provided, and a water film (9) is formed on that part. In such a configuration, the ultrasonic wave
emitted from the transmission transducer (1) reaches the water flank (9) via the transmission
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side delay line (2). Also, on the surface of the test voice (8), it is divided into an ultrasonic wave
transmitted to the inside of the test material (8) and an ultrasonic wave reflected. The ultrasonic
wave reflected on the surface of the test material (8) is reflected several times in the water film
(9) and reaches the receiving transducer (3) via the receiving delay line (4), and this also reaches
the surface It becomes an echo I. Further, the ultrasonic wave transmitted to the inside of the test
material (8) is reflected on the bottom surface of the test material (8) and is again transmitted via
the water film (9) receiving side delay line (4) It reaches 3) and this becomes bottom echo a. By
the way, in the case of the conventional ultrasonic split probe, when the surface of the test
material (8) is flat or convex, the flaw detection waveform is as shown in FIG. And no noise that
would be an obstacle in the flaw detection operation appears between the echo I and the bottom
surface echo a of the nine surfaces, but when the surface of the test material (8) is concave, the
flaw detection waveform is shown in FIG. (The surface leakage す 1 ° as shown in the figure.)
The level of 624 built-in echo I becomes large, and 1 echoes appear on the surface echo noise
echo between echo 0 and bottom surface echo 0 There was a drawback to decline.
This invention significantly improves the conventional defects, and provides an ultrasonic split
type probe capable of obtaining a dead zone (9) for stable flaw detection performance casting
without being greatly influenced by the unevenness of the test material. It is. Hereinafter, an
embodiment of the present invention will be described with reference to FIG. 3 (a). (1G, (C), FIG. 4
and FIG. 5 will be described in detail. Fig. 3 (a) is a cross-sectional view of the ultrasonic split
probe according to the present invention as viewed from the side, Fig. 3 (Sho, Fig. 4 is a crosssectional view from the front, Waveform (A scope), FIG. 5 (→ is a top view of the shoe, and FIG. 5
(l is a cross-sectional view of the shoe). Fig. 3 (,), (bl and Fig. 4, (1) in Fig. 5 is a transmitting
transducer, (2) is a transmitting side delay line (5) is a first acoustic shield plate made of cork
material (6) is a probe case, (7) is a function to form a water film (9) and to fix the second
acoustic shield plate a4. A second acoustic shield plate made of a material having resistance, such
as polyurethane rubber, nitrile rubber, etc., as a test material, al, a feature of the invention of the
invention, as a shoe of the second acoustic shield plate a4 ( 7) Fixing pin for fixing, al is an air
gap provided between the first acoustic shield plate (5), aη is a probe for fixing the shoe (7) and
the probe case (6) It is a holding body. In FIG. 3 (c), H is a transmission pulse, aυ is a surface
reflection echo, and al is a bottom surface echo. Since the second acoustic shield plate a of the
ultrasonic split probe according to this invention is provided longer than the lengths of the
transmission delay line (2) and the reception delay line (4), the test material (8) When the surface
of the surface is flat or convex, the second acoustic shield plate axis is bent as shown in FIG. 4
and when the surface of the test material (8) is concave, as shown in FIG. The second acoustic
shield plate a4 is always extended, and the water film (9) between the delay line + 21 and f 4 + of
the ultrasonic split type probe and the test material (8) can always be sufficiently strained. In
particular, the dead zone, 9), (5) 6 = (3 can be prevented from being significantly reduced. Also,
the second acoustic shield plate a4 is attached to the shoe (7) by the fixing pin ae and inserted
into the air gap a provided in the first acoustic shield plate (5), so that it is worn or damaged.
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There is an advantage that it can be easily replaced even if it occurs. As described above, this
invention fixes an acoustic shield plate (for example, polyurethane rubber, nitrile rubber, etc.)
having flexibility longer than the length of the delay line of the ultrasonic split probe to the shoe,
and the sound of the cork material By inserting it into the gap provided between the shield
plates, it is possible to prevent the flaw detection performance from decreasing due to the
increase of the water film thickness due to the concave of the test material which is also the
biggest drawback of the ultrasonic split probe. It is an object of the present invention to provide
a practical ultrasonic segmented probe that can be used.
In the embodiment, the first acoustic shield plate is in direct contact with the air gap on the
opposing surface of the first acoustic shield plate bonded to the transmission side delay line and
the first acoustic shield plate bonded to the reception side delay line. Although it is shown in the
state, it is needless to say that the present invention can be applied even when other solid
material is present between the first acoustic seal plate (“627 sheet and the air gap.
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