JPH0466865A - Ultrasonic flaw detector - Google Patents

Abstract

PURPOSE:To be able to automatically obtain data concerned in a defect position by controlling an action of a scanning circuit with signals attendant on a movement of a rotating probe, providing the rotating probe with a signal generator outputting signals concerned in rotation. CONSTITUTION:Angle signals interlocking with rotation of a rotating body 5 and corresponding to the moving distance are transmitted from a signal generator (rotary encoder) 6 connected with the rotating body 5 transmitting and receiving. Signals reflected from a defect of a specimen are added to a receiver 7 through a circuit-changing switch 3 and given an indicator (B mode indication) 11 as a deflection of the vertical direction through a gate circuit 8. The angle signals from the generator 6 are added to a signal converter (counter) 9, the converter counts angle signals reset every rotation, sums up these and converts to moving distance signals from a reference position. A scanning circuit 10 is controlled by signals from the generator 6. The X-coordinate value of scanning lines of the indicator 11 is the value corresponding to the said moving distance and the defect of the ultrasonic wave transmitting-receiving direction at the position on the specimen is indicated on the Y-coordinate corresponding to the propagation delay time.

Description

[Detailed description of the invention] ] Industrial application field: This invention is directed to transmitting/receiving ultrasonic waves perpendicularly or diagonally to the test material while moving the test material or the test material being transported, for example. The present invention relates to an ultrasonic flaw detection apparatus that detects defects in a test material using a rotary probe, and particularly to ultrasonic flaw detection using B-mode display.

[Prior art 1] FIG. 6 is a sectional view showing an example of a conventional rotary probe, in which 16 is a back plate, 17 is a piezoelectric sensor provided on the back plate 16, 23 is a material to be inspected, 26 is a rotary probe that sends and receives ultrasonic waves while moving; 27 is a holder for the probe; 28 is a shaft fixed to the holder 27; 29 is rotated around the shaft 28; A tire 30 made of a moving rubber material is a filling liquid filled into the tire 29. A conventional rotary probe is constructed as described above, and the rotary probe - 4 is a sample material 23. A tire 29 rotating on the top is rotatably held by a shaft 28 fixed to a holder 27, and inside the tire 29 made of an elastic rubber material, a filling liquid 30 such as water and the like are held. A back plate 16 having a piezoelectric vibrator 17 attached thereto is fixed to the shaft 28 on an end face or in a V-groove. The rotary probe 26 transmits and receives ultrasonic waves vertically or obliquely to the specimen 23 .

FIG. 7 is a side view showing an example of conventional ultrasonic flaw detection, and FIG. 8 is a top view of FIG. Defects in the test material 23 are detected by moving manual flaw detection or online flaw detection placed on the test material 23 being transported. When a defect 25 is detected, a marking device or the like is used to clearly indicate the defect position on the test material 23, and paint is sprayed to mark the position f\, and separately, after flaw detection is completed, the reference position 24 is marked.
Defect position data is obtained by manually measuring the distance χ from to the marked position.

[Problems to be Solved by the Invention] In the conventional ultrasonic flaw detection apparatus as described above, the rotary probe 26 placed on the transported test material 23 or rotated on the test material 23 is When a defect 25 in the inspection material 23 is detected, a marking device is installed that immediately responds to this and sprays paint to mark the corresponding position on the inspection material 23, and the marking device is attached to the inspection device 23 to spray paint to mark the corresponding position on the inspection material 23. Since the measurement of the distance is performed after the flaw detection work is completed, flaw detection data regarding the defect location cannot be quickly acquired.

Furthermore, since manual operation or intervention is required to measure the defect position related to the flaw detection data, the flaw detection data cannot be automatically acquired, which reduces work efficiency.

Furthermore, angle flaw detection of welds and plate wave flaw detection of thin plates are performed over a two-dimensional plane, and cannot be used for online flaw detection unless data on defect positions can be acquired at a speed equal to or higher than the conveyance speed of the test material 23. That's the problem.

This invention was made in order to solve this problem, and when detecting defects by rotating the transported test material or the test material, data related to the defect position on the test material is automatically acquired. It is an object of the present invention to provide an ultrasonic flaw detection device that can perform quality control of a test material by ultrasonic flaw detection quickly and appropriately without interrupting work.

[Means for Solving the Problems] An ultrasonic flaw detection device according to the present invention includes a signal generator that is attached to a rotary probe and generates a signal related to movement in conjunction with rotation, and a signal generator that generates a signal related to movement in conjunction with rotation. A signal converter converts the signal into a travel distance signal, and a scanning circuit generates a scanning signal to a display controlled by the signal converter output.

1. In this invention, a signal generator that outputs a signal related to the conveyed test material or rotation on the test material is attached to the rotary probe, and the signal generator outputs a signal related to the rotation of the test material being transported or the rotation on the test material. Since the operation of the scanning circuit is controlled by the signal, the scanning position of the display is controlled according to the moving distance of the rotary probe from the reference position, and the data on the defect position on the material to be inspected can be easily obtained from the display. I can understand it.

The moving speed of the rotary probe can be adjusted, so it can be used near the defect location.
Detailed defect detection can be performed by stopping movement during labor.

Marking the defect position and measuring the distance by temporarily observing the work are provided, and the defect position data is constantly supplied so that it can be easily grasped and ultrasonic flaw detection can be carried out quickly and efficiently.

Furthermore, by connecting a recorder to the signal generator and installing an identification circuit that selects a defect signal exceeding a threshold value from the received signal, it is possible to automatically record defect position data based on a command.

] Practical Example An example of the invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an example of the present invention. In the figure, 16, 17, 23, and 25 are the same as the above-mentioned conventional device, and 1 is a synchronizer that generates a timing signal for the operation of this device. 2 is a transmission circuit that outputs an energizing signal related to transmitting ultrasonic waves; 3 is a switch that switches between transmission/reception; 4 is a rotary probe; a rotating body for transmitting/receiving sound waves; 6 is a signal generator attached to the rotary probe 4 and generates a signal related to movement on the test material 23; 7 is a receiver; 8 is a gate circuit; 9 is a signal converter that converts the signal from the signal generator 6 into a moving distance signal; 10 is a scanning circuit that generates a scanning signal controlled by the signal from the signal converter 9; and 11 is a display that performs B mode display. It shows.

In the ultrasonic flaw detection apparatus configured as described above, a power-amplified pulse signal is output from the transmission circuit 2 in accordance with the timing signal of the output of the synchronous circuit 1, and is sent to the rotary probe 4 via the switch 3. You can call it. Test material 23 between rotating bodies
The back plate 1 always points directly below regardless of the upper rotation.
The piezoelectric vibrator 17 attached to the specimen 6 is energized and
In the direction 3, ultrasonic pulses are transmitted for vertical flaw detection, oblique flaw detection, and plate wave flaw detection for drilling into thin plates. At this time, for example, a rotary encoder used in the signal generator 6 connected to the rotary bodies outputs an angle signal corresponding to the distance traveled by the rotary bodies in conjunction with the rotation of the rotary bodies.

The reflected signal from the defect 25 in the material to be inspected 23 is applied to the receiver 7 via the switch 3, and then via the gate circuit 8 to provide vertical deflection of the display 11 for B-mode display.

The angle signal generated by the rotary encoder of the signal generator 6 attached to the rotary probe head and generated by the mutual rotation of the rotating bodies is sent to a counter, for example, as the signal converter 9, and is reset every rotation. The angle signals from the signal generator 6 are counted, accumulated, and converted into a moving distance signal of the rotary probe 4 from the reference position 24. A scanning circuit 10 that generates a horizontal scanning signal is controlled by a signal from a signal generator 6,
The scanning line X coordinate of the display 11 displayed in B mode becomes a value corresponding to the above-mentioned moving distance, and corresponds to the propagation time of the defect 25 in the transmitting/receiving direction of the ultrasonic wave formed at the relevant position on the test vJ23. Displayed at the Y coordinate.

5.6.16.1 FIG. 2 is a cross-sectional view of a main part showing an embodiment of a rotary probe, and FIG. 3 is a cross-sectional view taken along line A-A in FIG.
7.23.30 is the same as the above embodiment, 14 is a tire made of an elastic member provided on the outer circumferential surface of each rotating body, 15 is a holder, and 18 is a hollow shaped tire whose one end is fixed to the holder 15. A shaft, 19 a side plate 20 constituting one side of the rotating body;
indicates a transmission shaft that constitutes the side of the rotating body and transmits rotation.

By operating the holder 15, as the rotary probe moves over the specimen 23, the rotary body filled with the filling liquid 30 rotates, and the ultrasonic waves are transmitted 7 through the tires 14. 'While receiving waves, the rotation of the rotating body 5 is transmitted from the transmission shaft 20 to the signal generator 6. Therefore, a corresponding angle signal is always output from the signal generator 6 in conjunction with the rotation of the rotary probe unit.

Figure 4 is a side view showing an example of flaw detection on the test material, 4.23.2
4.25 is the same as the above example, for example, the test material 23
The thin plate is extruded by the rotation of the rolling roller 22 and conveyed on the arranged rolls 21. When the rotary probe 4 is placed at the reference position 24 and comes into contact with the specimen 23, the angle signal from the signal generator 6 is generated as the rotary probe 4 rotates due to the conveyance of the specimen 23. Ultrasonic waves are transmitted for vertical flaw detection or diagonal plate wave flaw detection from a direction perpendicular to the conveyance of the thin plate, and defect detection is performed by online flaw detection. Flaw detection data on travel distance can be obtained quickly.

FIG. 5 shows an example of B mode display, and in the B mode display image displayed on display 11/\,
The X coordinate corresponds to the distance χ of the rotary probe 4 moved from the reference position 24 to the defect 25, and the Y coordinate corresponds to the ultrasonic wave from the rotary probe 4 to the defect 25 that is incident vertically or obliquely. Distances are shown based on propagation time. Therefore, the scanning of the Y coordinate is performed at a preset speed, and the scanning of the X coordinate is performed based on the transport speed of the test material 23 and the moving speed of the rotary probe 4 on the test material 23. When it stops at a predetermined distance from the position 24, the Y coordinate at the X coordinate position is scanned.

As described above, by adjusting the moving speed of the rotary probe 4 on the test material 23, the scanning speed of the X coordinate in the B mode display of the display 11 can be adjusted as appropriate, and furthermore, at the selected position on the X coordinate, Since scanning can be stopped, defects can be inspected at the relevant position on the material 23 to be inspected quickly and efficiently.

In addition, defect signals exceeding the threshold value are identified from the output signal of the receiver 7, and the digital value of the X-coordinate signal output from the signal converter 9 at this time is printed on the recorder, thereby generating flaw detection data related to the defect position. can be automatically recorded.

Furthermore, if the Y coordinate signal is also digitally converted and applied to a recorder, the defect position can be automatically recorded. Therefore, it can contribute to improving the efficiency of ultrasonic flaw detection.

3. Effects of the Invention As explained above, the present invention includes a rotary probe equipped with a signal generator that outputs a signal related to the movement in conjunction with a rotating body moving over a specimen, and a signal indicating the distance traveled. With a simple structure that includes a scanning circuit controlled by a signal converter that generates flaws, data on the position of defects on materials to be inspected in various types of flaw detection can be automatically acquired at all times.

Since the moving speed of the rotary probe can be adjusted, defects in the vicinity of the selected position can be detected in detail.

A recording device is also installed to automatically record defect location data.

It has the advantage that it can be used for online flaw detection to quickly and efficiently acquire flaw detection data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of essential parts showing an embodiment of a rotary probe, and FIG. 3 is a cross-sectional view taken along line A-A in FIG. Figure 4 is a side view showing an example of flaw detection on a test material, Figure 5 is an example of B-mode display, Figure 6 is a cross-sectional view of an example of a conventional rotary probe, and Figure 7 is a conventional ultrasonic probe. FIG. 8 is a side view showing an example of flaw detection, and FIG. 8 is a top view of FIG. 7. In the figure, 4 is a rotary probe, 6 is a rotating body, 6 is a signal generator, 9 is a signal converter, 10 is a scanning circuit, and 11 is a display. Note that the same reference numerals in each figure indicate the same or corresponding parts. Patent applicant: Tokyo Keiki Co., Ltd. Figure 4 Figure 5 Figure 8

Claims (3)

[Claims] (1) An ultrasonic probe that detects defects in a test material using a rotating probe that transmits and receives ultrasonic waves toward the test material while rotating over the test material or the test material being transported. In the sonic flaw detection device, a signal generator that is attached to the rotary probe and generates a signal related to movement in conjunction with the rotation, and a signal converter that converts the signal from the signal generator into a moving distance signal. and a scanning circuit that generates a scanning signal to a display controlled by the output of the signal converter. (2) Claim 1, wherein the signal generator is a rotary encoder.
The ultrasonic flaw detection device described. (3) The ultrasonic flaw detection device according to claim 1, wherein the indicator is a B-mode indicator.