JPH09145698A - Ultrasonic flaw detector for metal bars - Google Patents

Abstract

(57) [Abstract] [Problem] Even if flaw detection is performed by a plurality of ultrasonic probes, noise can be generated without any noise, and flaw detection of internal defects of a metal rod can be performed with high precision, and special installation on a running line (EN) An ultrasonic flaw detector for a metal rod that does not require space, does not require a drive unit for swinging or rotating the ultrasonic probe, and does not slow down the flow speed of the running line. . SOLUTION: In an ultrasonic flaw detector for a metal rod 1 that is drawn or peeled with a die 2 and molded into a round or polygonal cross-sectional shape, a die is inserted into a die holder 3 of the die 2. A plurality of ultrasonic probes 4 are provided so as to face the processed metal rod 1, and a processing oil chamber 9 is formed between the metal rod 1 and the ultrasonic probe 4 as a contact medium. It will be done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an internal defect of a metal rod material processed by a die using ultrasonic waves, and more particularly to an inside of the metal rod material utilizing ultrasonic reflection. The present invention relates to an ultrasonic flaw detector for a metal rod that detects defects.

[0002]

2. Description of the Related Art When an ultrasonic wave, which is an elastic wave, is sent into an object, it propagates into the object, and when it hits an end face or a defect, it is reflected there and returns. The ultrasonic flaw detection method attempts to measure the internal state of an object from the outside in a non-destructive manner by utilizing this phenomenon.

Up to now, an ultrasonic flaw detector has been used to detect the presence or absence of internal defects in a metal rod material which has been molded into a round or polygonal cross-section by drawing or peeling with a die.

3A to 3C show a conventional ultrasonic flaw detector.

In order to detect an internal defect in a metal rod (for example, a rough-drawn copper rod for electric wire), a method shown in FIG.
As shown in (B), one ultrasonic probe 13 is swung or rotated in the arrow direction on the surface of the metal rod 11 to detect the inside of the metal rod 11, or ), The metal rod 11 is attached to the rotary fixing device 1 in the running line.
An ultrasonic flaw detector was used, which was fixed at 9 and used for internal flaw detection using a plurality of ultrasonic probes 13.

[0006]

However, FIG.
When performing flaw detection with one ultrasonic probe 13 as in (A) and (B), a drive device for swinging or rotating the ultrasonic probe 13 is required, and When it is installed in a line between lines, there is a problem that not only an installation space is required, but also the flow speed of the running line must be reduced depending on the flaw detection speed of the ultrasonic flaw detector.

When an ultrasonic flaw detector having a plurality of ultrasonic transducers 13 is installed on a running line as shown in FIG. 3C to perform flaw detection, the ultrasonic probe 13 is shaken. It does not require a driving device for moving or rotating and does not slow down the flow speed of the processing line, but the ultrasonic waves emitted from the plurality of ultrasonic probes 13 interfere with each other and the receiving side However, there is a problem that noise is generated in the interior of the metal rod 11 and the internal defects of the metal rod 11 cannot be detected with high accuracy.

Therefore, the present invention solves the above-mentioned problems, and noise is not generated even when flaw detection is performed by a plurality of ultrasonic probes in a running line, and the ultrasonic probe is swung or It does not require a drive device for rotation, does not require a special installation space for the ultrasonic probe, and does not slow down the flow speed of the running line, and it is highly accurate for the internal defects of metal rods. An object of the present invention is to provide an ultrasonic flaw detector for metal rods that can perform flaw detection.

[0009]

In order to solve the above-mentioned problems, the invention of claim 1 is directed to a metal rod material which is formed into a round or polygonal cross-sectional shape by being subjected to a drawing process or a peeling process with a die. In the ultrasonic flaw detection device, in the die holder of the die, a plurality of ultrasonic probes are provided so as to face the metal rod material after the die processing, and the metal rod material and the ultrasonic probe are A processing oil chamber as a contact medium is formed between them.

According to a second aspect of the present invention, each of the ultrasonic probes is connected to an ultrasonic flaw detector, and the ultrasonic flaw detector sequentially transmits time-divided transmission pulses to each ultrasonic probe. Is to be sent.

According to a third aspect of the present invention, an oil feeding pipe for injecting the processing oil is provided in the processing oil chamber in the die holder in front of each of the ultrasonic probes.

According to the above construction, a plurality of ultrasonic probes are embedded in the die holder of the dice in the running line so as to face the metal rod through the processing oil as the contact medium. By doing so, it does not require a special space for installing a drive device and an ultrasonic probe for swinging or rotating the ultrasonic probe, and without decelerating the flow speed of the processing line, Each ultrasonic probe using machining oil as a contact medium sequentially transmits the time-divided transmission pulses transmitted from the ultrasonic flaw detector to the inside of the metal rod material, so that the ultrasonic probes are separated from each other. It is possible to prevent the generation of noise due to the interference of the ultrasonic waves and to detect the internal defect of the metal rod with high accuracy.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a vertical sectional view of an ultrasonic flaw detector according to the present invention. FIG. 2 is a view taken along the line AA in FIG.

As shown in FIGS. 1 and 2, the metallic material 1
a is a metal rod 1 having a round or polygonal cross-sectional shape
The die 2 for molding has an insertion opening 2a for inserting the metal material 1a and an extraction opening 2b for withdrawing.

The die 2 is provided with a die holder 3 for surrounding the outer periphery of the die 2 with a predetermined layer thickness and for holding the die opening 2b by covering it.

In the present invention, the drawing port 2b of the die 2 is used.
The die holder 3 covering the side is formed to have a predetermined layer thickness so as to surround the drawing port 2b, and is drawn coaxially with the drawing port 2b by expanding the diameter of the drawing port 2b.
A passage 21 is formed for guiding the shaft in the axial or longitudinal direction.

Further, the passage 21 is formed in the shaft core portion of the die holder 3 as shown in the drawing, and has a predetermined length in the axial direction.

In this passage 21, three mounting holes 10 for mounting the ultrasonic probe 4 are formed at equal intervals in the circumferential direction and penetrating outward in the radial direction. The ultrasonic probe 4 is seated in these mounting holes 10 and the die 2
A step portion 10a is formed so as to face the surface portion of the metal rod 1 to be inspected, which has been pulled out from and processed.

Therefore, in these mounting holes 10, the ultrasonic probe 4 is seated on the step portion 10a, and the mounting flange 4 thereof is mounted.
f is attached to the step portion 10a by the fixing screw 6 and is supported by each.

A predetermined gap S is formed between the ultrasonic probe 4 attached to the die holder 3 and the surface of the metal rod 1 to be inspected.
It is formed so as to surround the metal rod 1 along the outer peripheral portion of the metal rod 1 pulled out from the inside, and the gap S is filled with the processing oil supplied from the oil feed pipe 5 formed in the die holder 3. The processing oil chamber 9 is formed. The processing oil in the processing oil chamber 9 serves as a contact medium for ultrasonic flaw detection.

In the present invention, one end of the processing oil chamber 9 is closed on the side of the drawing port 2b of the die 2 and the other end is open. A sealing member is provided in the opening 22. Of course, you can close it.

Each of the ultrasonic probes 4a, 4b, 4c
Is connected to the ultrasonic flaw detector 7, and the transmission pulse transmitted from the ultrasonic flaw detector 7 to the ultrasonic probe 4 is time-divided and sequentially transmitted from the respective ultrasonic probes 4a, 4b, 4c. It is configured to detect the presence or absence of the internal defect 8 inside the metal rod 1 by the reflection echo of the transmission pulse.

Next, the operation of the present invention will be described.

By using the die 2 for drawing or peeling the metal material 1a, the metal material 1a is
It is molded into a metal rod 1 having a round or polygonal cross-sectional shape (for example, a rough-drawn copper rod for electric wires), and is pulled out from the die holder 3 on the running line.

A metal rod 1 processed by a die 2 or the like
Since there is a possibility that a processing defect will exist inside, the presence or absence of the internal defect 8 of the metal rod 1 is detected by ultrasonic flaw detection.

A plurality of ultrasonic probes 4 arranged radially in the die holder 3 of the dice 2 on the running line.
a, 4b, and 4c are the ultrasonic probes 4a, 4a, and 4b from the ultrasonic flaw detector 7 using the processing oil in the processing oil chamber 9 as a contact medium.
4b, 4c is transmitted to the transmission pulse, the metal rod 1 after die processing by the reflection echo of the transmission pulse
The internal defect 8 is detected. Since ultrasonic flaw detection is performed in the die holder 3 of the die 2, the positional fluctuation of the metal rod 1 is extremely small, and stable flaw detection is always possible.

Each of the ultrasonic probes 4a, 4b, 4c
The transmission pulse transmitted from the inside of the metal rod 1 to the inside of the metal rod 1 is reflected at the bottom surface of the metal rod 1 or the internal defect 8, and the reflection echo of the transmission pulse is reflected by each ultrasonic probe 4.
The signals are received at a, 4b, and 4c, and detected by the ultrasonic flaw detector 7 as an ultrasonic echo.

In the case of drawing or the like, the internal defect 8 is stretched in the longitudinal direction during processing and its cross section has a flat shape. Therefore, when one ultrasonic probe 4 is used, the ultrasonic probe 4 is used. When the transmitted pulse transmitted from the device does not hit the plane of polarization, it may not be possible to obtain sufficient reflected echoes.
By arranging the three ultrasonic probes 4a, 4b, 4c radially in the circumferential direction of the metal rod 1, the transmission pulse transmitted from any one of the ultrasonic probes 4 is changed to the metal rod. 1
Since the light is reflected on the plane surface of the internal defect 8 of (1), it is possible to surely obtain a sufficient reflection echo.

The reason why the internal defect in the metal rod 1 is detected by the time-divided transmission pulse will be described below.

When transmitting the transmission pulse from the ultrasonic probe 4a, the transmission of the transmission pulse from the ultrasonic probes 4b and 4c is stopped, and then transmitted from the ultrasonic probe 4b with a slight delay. When transmitting a pulse, the ultrasonic probe 4
When a transmission pulse is transmitted from one ultrasonic probe 4, for example, by stopping transmission of transmission pulses from a and 4c, the transmission pulse from another ultrasonic probe 4 is transmitted. By stopping, it is possible to prevent mutual interference of the transmission pulses transmitted from the respective ultrasonic probes 4a, 4b, 4c, and to prevent generation of noise.

In the present invention, the three ultrasonic probes are embedded and fixed in the die holder, but the number of ultrasonic probes may be increased or decreased as appropriate, and normally, in the drawing process. Since the metal rods of various sizes (especially the diameter size) are used and the inner diameter of the die changes each time, the outer diameter of the die is kept constant and as many ultrasonic probes as possible are used in the die holder. By arranging, it is possible to cope with a metal rod having any diameter from a small diameter to a large diameter.

[0033]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) By placing the ultrasonic probe in the die holder of the die on the running line,
There is no need to reduce the flow speed of the running line, and no special space for installing the ultrasonic probe is needed.

(2) By performing ultrasonic flaw detection using a plurality of ultrasonic probes, it is not necessary to provide a driving device for swinging or rotating the ultrasonic probes.

(3) Each ultrasonic probe using the processing oil in the processing oil chamber as the contact medium sequentially transmits the time-divided transmission pulses transmitted from the ultrasonic flaw detector to the inside of the metal rod. As a result, it is possible to prevent the generation of noise due to the interference of ultrasonic waves between the ultrasonic probes and to detect the internal defect of the metal rod material with high accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a vertical cross-sectional view of an ultrasonic flaw detector of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a diagram showing a conventional ultrasonic flaw detector.

[Explanation of symbols]

 1 Metal Rod 2 Die 3 Die Holder 4 Ultrasonic Probe 5 Oil Pipe 7 Ultrasonic Flaw Detector 9 Processing Oil Chamber

Claims (3)

[Claims] 1. An ultrasonic flaw detector for a metal rod material, which is formed into a round or polygonal cross-sectional shape by being subjected to a drawing process or a peeling process with a die, in a die holder of the die after the die processing. A plurality of ultrasonic probes are provided so as to face the metal rod, and a processing oil chamber as a contact medium is formed between the metal rod and the ultrasonic probe. Ultrasonic flaw detection equipment for metal rods. 2. The ultrasonic probes are connected to ultrasonic flaw detectors, and the ultrasonic flaw detectors sequentially transmit time-divided transmission pulses to the respective ultrasonic probes. 1. An ultrasonic flaw detector for a metal rod according to 1. 3. The ultrasonic flaw detector for a metal rod according to claim 1, wherein an oil feed pipe for injecting the processing oil is provided in front of each of the ultrasonic probes in the processing oil chamber in the die holder.