JPH056532Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is based on the ultrasonic flaw detection method in which ultrasonic waves are emitted from a transmitting angle probe attached to the surface of the specimen and propagate inside the specimen. sound pressure distribution (hereinafter V
The present invention relates to an oblique ultrasonic characteristic measuring device that can effectively measure the acoustic velocity anisotropy of a test material by measuring the echo height of a transmitted wave using opposing oblique receiving probes.

(Prior art) Conventionally, as a method of measuring sound velocity anisotropy, for example, the Japanese Nondestructive Inspection Association Second Subcommittee NDI Material
2428 (January 26, 1972), the angle probe is held manually, and the probe spacing, beam path, and echo height are determined to maximize the echo height of the ultrasonic V-transmitted wave. I was measuring, but the direction of the probe
It is difficult to maintain a uniform pressing force, etc.
Furthermore, since there are individual differences depending on the measurer, the reproducibility of the data is poor and reliability is lacking.
In addition, it also has drawbacks such as requiring a long measurement time.

(Problems to be Solved by the Invention) The present invention provides an oblique ultrasonic characteristic measuring device that moves the measuring position in a self-propelled manner and performs stable and reliable anisotropy measurement of the speed of sound.

(Means for solving the problem) The present invention has a simple device configuration, but has a mechanism that can hold the probes in a stable state at all times. Each probe is supported by a leaf spring, and the receiving angle probe is made movable by a scanning mechanism consisting of a rotating frame, a scanning table, a scanning feed screw, and a drive motor,
It has a receiving probe position detector, and further includes a device fixed magnet, a frame holding roller, a rotationally movable magnet roller, and the magnet roller so that the rotating frame can be rotated about a rotating shaft as a fulcrum. The present invention provides an oblique ultrasonic characteristic measuring device having a rotation mechanism including a driving motor.

An embodiment of the device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view, and FIG. 2 is a plan view. In this figure, an ultrasonic wave 22 is made to enter the inside of the specimen 13 by a transmitting angle probe 15 attached to the upper surface of the specimen 13. Using the receiving angle probe 19, the probe scanning drive motor 8 moves the probe 19 in the direction of arrow I at the position where the echo height of the V transmitted wave propagating inside the test material 13 is the highest. This method measures the anisotropy of sound speed by detecting it while moving.

The transmitting bevel probe 15 is held by a holder 14 , and the probe 15 and holder 14 are supported by a leaf spring 16 . The other end of the leaf spring 16 is
It is fixed to the rotating frame 4 by a plate spring fitting 17 attached to the lower surface of one end of the rotating frame 4.

On the other hand, the receiving probe 19 is the transmitting angle probe 1
The probe 19 and holder 18 are held by a holder 18 in a position opposite to the probe 19 and
Supported by The other end of the leaf spring 20 is fixed to the scanning table 6 by a leaf spring attachment fitting 21 attached to the lower surface of the scanning table 6. Reference numeral 15 in Fig. 1,
14, 16, 17 and codes 19, 18, 20, 21
have the same size and structure, and these are collectively referred to as the probe holding mechanism.

FIG. 3 shows a detailed view of the probe holding mechanism.

FIG. 3a is a side view of the reception probe holding mechanism. The holder 18 that holds the probe is fixed by the plate spring 20c, but the angle α is set so that the holder 18 is pressed against the upper surface of the specimen.
bending process. The angle α is set between the fulcrums of the roller 23 and the magnetic roller 10 so that it can be reliably brought into close contact with the upper surface of the specimen even if the upper surface of the specimen is curved while moving in the direction of arrow I. It is something. A bolt 27 fixes the leaf spring 20c to the holder 18.

Further, the receiving angle probe 19 is pressed from above by the leaf spring 20a so that it is reliably housed in the holder 18. 20b connects the leaf spring 20a to the leaf spring 2.
This is a bolt for fixing on 0c. The holder 18 has a structure in which a protrusion 18b is provided in the holder so that even when the reception probe 19 is pushed in from above, there is always a constant gap between the surface of the steel plate that is the material to be inspected, and a protrusion 18b is provided in the holder. , water hose connection port 25
The flaw detection water supplied from the above enters and forms a water curtain.

A water reservoir 18a is provided inside the holder 18, and since the front is open, the structure allows for a stable supply of flaw detection water and reliable air bleed. It is possible to reliably enter the steel plate being inspected, and the V
The echo height of transmitted waves can be measured reliably and stably.

The scanning table 6 is supported at both ends of the rotating frame 4, and is movably attached to a scanning feed screw 7 provided parallel to the frame 4. When the scanning feed screw 7 is rotated by the probe scanning drive motor 8, it can move in the direction of the arrow or ''. Since rotational force due to the rotation of the screw 7 is applied to the scanning table 6, a groove 4a is cut on the inner side of the lower surface in the length direction of the rotating frame 4 in parallel with the screw 7 to prevent rotation.
A scanning guide 5 attached to the top surface of the scanning platform 6 allows the scanner to move straight.

The scanning feed screw 7 is rotated by a probe scanning drive motor 8 provided on one end surface of the rotating frame 4, and its scanning movement distance is measured by a length measuring meter 9 directly connected to the probe scanning drive motor 8. Ru. The above-mentioned symbols 4, 5, 6, 7, 8, and 9 constitute a scanning mechanism that scans the receiving oblique probe holding mechanism.

Figure 2 is a plan view of the present invention, showing the initial measurement position of 0°.
FIG. 3 is an explanatory diagram of a mechanism that changes the measurement position downward to the direction of 90°. Of course, upwards in the drawing
It can also be rotated in the 90° direction (arrow ′).

The rotating frame 4 is fixed by adsorption or contact with the material to be inspected by a magnet roll 10 provided on both sides of one end of the frame, a roller 26, and a roller 23 provided at the other end. Further, the rotating frame 4 is connected to the frame support fitting 2 via the rotating shaft 3,
One end of the support fitting 2 is fixed to the device fixing magnet 1. The magnet 1 is fixed to the upper surface of the specimen 13 by adsorption. The magnet roll 10 is rotationally driven by a rotary drive motor 11 provided on the upper surface of one end of the rotating frame 4, and accordingly, the rotating frame 4 is movable in the direction of the arrow or ' with the rotating shaft 3 as a fulcrum. It is.

The rotating frame 4 is supported at three points: a roller 23, a magnet roller 10, and a roller 26, and is stably installed on the top surface of the specimen 13.
Since it rotates and moves while adsorbing the test material, even if the upper surface of the test material 13 is corrugated and uneven, it can reliably rotate and move without slipping.

Further, the rotational movement distance is measured by a length measuring meter 12 directly connected to the motor 11. Above codes 1, 2, 3,
4, 10, 11, 12, 23, and 26 constitute a rotation mechanism that rotates the rotation frame.

If the material to be tested 13 is a magnetic material such as a steel plate as in the embodiment, the material to be tested 13 will be in a tilted state as long as the adsorption force between the device fixing magnet 1 and the magnet roll 10 is within the range that holds the device. It can be measured without any problem even if Further, even if the material 13 to be tested is a non-magnetic material, frictional force is generated by the gravity applied to the magnet roller 10, and measurement can be performed without any problem in a horizontal state. By using rollers with rubber tires, the frictional force can be further improved.

As described above, the device of the present invention can be configured in various ways without departing from the advantages of the present invention, and the range of application of materials to be tested can be expanded.

(Function) When measuring the sound velocity anisotropy of a test material, first,
This device is fixed and attached at the measurement position on the surface of the test material by the attraction force of the device fixing magnet 1 and magnet roll 10. Both the transmitting and receiving angle probes are fixed to the surface of the test material by the pressing force of the leaf springs 20. The probe scanning drive motor 8 of the scanning mechanism is driven to move the receiving angle probe holding mechanism toward the transmitting angle probe (' direction) and bring it close to the transmitting angle probe 15 and wait at the opposing position.

Next, the transmitting bevel probe 15 transmits ultrasonic waves, and in order to receive the V-transmitted waves propagated inside the specimen, the motor 8 of the scanning mechanism is driven, and the receiving bevel probe 15 is driven. While moving the receiving angle probe 19 of the tactile mechanism in the direction of the arrow with constant pressure by the leaf spring 20, the position where the echo height of the V transmitted wave is maximum is measured and searched. Read the distance between the tentacles using the length measuring meter 9.

The anisotropy of sound speed is measured from the probe spacing, beam path length, and echo height. In addition, when measuring the sound velocity anisotropy in a direction perpendicular to the above measurement direction, by driving the rotation drive motor 11 of the rotation mechanism and rotating the magnet roller 10, the rotation frame 4 is moved around the rotation shaft 3. As a fulcrum, it is rotated in the direction of the arrow or ', fixed when it comes to a right angle position, and measured by carrying out the same measurement method as above.

(Effect of the invention) As explained above, according to this invention device,
The probe and probe holder are supported by a leaf spring with a constant pressing force, and a water reservoir that allows flaw detection water to flow smoothly and an air vent structure that opens at the front simplify the area around the detection unit and improve drive efficiency. The system uses a self-propelled system that uses a scanning feed screw to move the receiving bevel probe and rotates the entire frame using a magnetic roll to move the measurement position, making the system simple and lightweight. It is portable.

Furthermore, while maintaining a constant gap between the transmitting and receiving angle probes and the top surface of the test material, stable and reliable sound velocity anisotropy measurements can be made in a short time, and data reproducibility can be obtained. It has excellent effects.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is a side view, Figure 2 is a plan view of Figure 1, and Figure 3 is a detailed view of the probe portion of Figure 1. , Fig. 3a is a side view, b is a front view, and c is a plan view. DESCRIPTION OF SYMBOLS 1... Magnet for device fixation, 10... Magnet roll, 15... Transmission probe, 19... Receiving probe, 20... Leaf spring, 7... Feed screw, 8...
...Scanning drive motor, 11...Rotation drive motor.

Claims (1)

[Scope of utility model registration request] A transmitting bevel probe supported via a leaf spring is placed below one end of the rotating frame, a receiving bevel probe is supported via a leaf spring at the bottom end of the scanning table, and the top end of the scanning table is rotated. a scanning mechanism that is slidably attached to a groove provided in the body of the frame, and allows the receiving angle probe to move in the axial direction of the rotating frame by rotation of a scanning feed screw passing through the scanning platform; The end of the frame support fitting fixedly attached to the device fixing magnet, a roller below one end of the rotating frame to which the transmitting/receiving angle probe and the scanning mechanism are attached, and rollers on both sides of the other end. A tilt mechanism characterized by having a rotation mechanism that connects a rotatable moving magnet roll for rotating the rotary frame and a body end of the rotary frame provided with the rotary frame via a rotary shaft so that the rotary frame can freely rotate. Angular ultrasonic characteristic measuring device.