JPS60164249A - Flaw detector - Google Patents

Abstract

PURPOSE:To examine the flaws in the inside and the surface of a material to be examined by one apparatus, by detecting the flaw in the inside by an ultrasonic wave flaw detecting method, converting a part of flaw detecting ultrasonic waves into an electric signal, performing magnetic flaw detection, converting the signal to the ultrasonic wave signal again, and discriminating the ultrasonic-wave detected-flaw signal and the magnetic detected-flaw signal by time division. CONSTITUTION:An electric signal, which is applied to an ultrasonic wave transmitting vibrator 1, generates ultrasonic waves 2. The waves are sent to an ultrasonic wave vibrator holder 3, and the flaw in the inside of a material to be examined 4 is detected. The waves become an ultrasonic-wave detected-flaw signals, which is received by an ultrasonic wave receiving vibrator 5. Meanwhile, a part of the inputted ultrasonic waves 2 is applied to a magnetic probe 9 through a detection 8 as an electric signal. The magnetic detected-flaw signal from a surface defect 10 of the material to be examined 4 is converted into ultrasonic waves. The ultrasonic-wave detected-flaw signal and the magnetic detected-flaw signal are separated by a signal separating circuit 16 and added to a signal processing circuit 18. Thus the detected flaw juding process is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flaw detection device for performing non-destructive inspection of flaws on products on a production line in a steel material production factory, for example.

[Conventional technology]

Conventionally, non-destructive testing has been carried out in the process of producing steel materials to guarantee their quality, but the method used is ultrasonic flaw detection and magnetic flaw detection, which are performed independently on the production line. Ta. What is Jin's reason?

Ultrasonic flaw detection uses the principle that ultrasonic waves are reflected by flaws in the material being tested, so internal flaws can be detected, but large reflected ultrasonic waves are generated on the surface where the ultrasonic waves are incident or near the point of incidence. Therefore, even if there is a scratch, the reflected wave is large and cannot be detected. Therefore, the ultrasonic flaw detection method was used to inspect the internal parts of the specimen material. On the other hand, in the a-air flaw detection method, an external magnetic field is applied to the material to be inspected, and flaws are detected by utilizing the leakage magnetic flux generated at or near the surface of the material to be inspected. There is. Since detection is based on the generation of leakage magnetic flux, it was used to inspect flaws on and near the surface of materials with magnetic properties, such as steel materials. However, in the production of steel materials, automation of production lines is progressing to improve productivity. Flaw inspection, which is part of the production line, has also been automated and is carried out using automatic flaw detection equipment. Moreover, shortening the inspection line is a problem in order to improve production efficiency, and it has been desired to be able to simultaneously inspect internal and surface defects in steel materials to improve productivity.

[Summary of the invention]

This invention was made for the purpose of solving this problem, and at the same time when performing internal flaw detection using the ultrasonic flaw detection method, a part of the ultrasonic waves detected is converted into an electric signal and taken out to the outside, and is used as an operating power source for the magnetic flaw detector. The flaw detection signal is transferred and converted into an ultrasonic signal again, which is received by the flaw sound wave receiving transducer for the V'3 detection section, and the ultrasonic flaw detection signal and the magnetic flaw detection signal are discriminated by time division.

This paper proposes a flaw detection device that can inspect the internal and surface flaws of a test material with a single device.

[Embodiments of the invention]

The figure is a block diagram showing one embodiment of the present invention. (1
) is a transducer for ultrasonic transmission, (2) is an ultrasonic wave, (3) is an ultrasonic transducer holder, (4) is a test material, (5) is a transducer for ultrasonic reception, (6) is a reflection plate, (7) is a sub-ultrasonic receiving transducer, (8) is a detector, (9) is a magnetic probe, the surface is a defect, aυ leakage magnetic flux, 6 is a high frequency filter, (I
3 is a delay circuit, aJ is a sub-ultrasonic transmission transducer, aJ9 is an ultrasound receiver, 顛 is a signal separation circuit, on is a control circuit,
The trout is the signal processing circuit, α1 is the ultrasonic exciter, and the wire is the test material (
4)' is an internal defect.

Next, the operation will be explained. Ultrasonic transmission transducer (1)
The applied electrical signal generates an ultrasonic wave (2).

Via the ultrasonic transducer holder (3), the inside of the test material (41 is detected and an ultrasonic flaw detection signal is generated); the ultrasonic receiving transducer (
5) is received. On the other hand, a part of the ultrasonic wave (2) incident on the ultrasonic transducer holder +31
) is attached to one end of the ultrasonic wave (2), and the ultrasonic wave (2) is reflected by the reflecting plate (6) and reaches a sub-ultrasonic receiving transducer (7) which extracts the ultrasonic wave (2) as an electrical signal. The signal obtained from the sub-ultrasonic receiving transducer (7) is applied to the detector (8), where it is detected, a DC bias is added, and the signal is applied to the magnetic probe (9).Magnetic probe (9) is the surface defect of the test material (4)
The leakage magnetic flux aυ of n is detected and becomes a signal including a magnetic flaw detection signal, which is applied to the high frequency filter aa. High frequency filter (
In 2), you can see how the delay circuit U works by extracting the high frequency component of the signal. The delay time of the delay circuit (II) is such that the ultrasonic wave (2) emitted from the ultrasonic transmitting sensor (1) reaches the bottom of the test material (4) and reaches the ultrasonic receiving transducer (5). The output signal of the delay circuit H excites the sub-ultrasonic transmitting transducer a41 and becomes an ultrasonic wave (2). (5).The ultrasonic wave (2) that has reached the ultrasonic receiving transducer (5) is converted into an electrical signal and sent to the ultrasonic receiver a9.
The signal is amplified and added to the signal separation circuit (I [9). In the signal separation circuit αQ, according to the timing command of the control circuit aη, it is separated into an ultrasonic flaw detection signal and a magnetic flaw detection signal, and the signal is sent to the signal processing circuit A level. is added to perform flaw detection and judgment processing.

〔Effect of the invention〕

According to this invention, the inspection of flaws on steel materials, etc., which was conventionally performed on the inside and on the surface using separate processing equipment, can be integrated into one by using this invention, greatly increasing the efficiency of the production line. There are advantages to

[Brief explanation of the drawing]

The figure is a block diagram of an embodiment of the present invention. In l, (11 is a transducer for ultrasonic transmission, (3) is an ultrasonic transducer holder, (5) is a transducer for ultrasonic reception, (6)
is a reflector, () is a sub-ultrasonic receiving transducer, and (8) is a detector. (9) is a magnetic probe, α is a high frequency filter, a is a delay circuit, (I4 is a sub-ultrasonic transmission transducer, aJ9 is an ultrasonic receiver, (Ie is a signal separation circuit. Masuo Oiwa

Claims (1)

[Scope of Claim] An ultrasonic oscillation vibrator for ultrasonic flaw detection that transmits ultrasonic waves in a flaw detection device for flaw detection of a material to be inspected. An ultrasonic transducer holder that transmits the ultrasonic waves emitted by this ultrasonic oscillating transducer to the test material, and an ultrasonic receiving transducer that receives reflected signals detected by the ultrasonic waves emitted by this ultrasonic transducer holder. , a reflector for reflecting ultrasonic waves provided in a part of the ultrasonic transducer holder, an ultrasonic receiving transducer for outputting the ultrasonic waves reflected by the reflector as an electrical signal, and this sub-ultrasound transducer. A detector that converts the signal from the acoustic wave transducer into a DC signal, and a magnetic probe that operates using the DC signal generated by the detector. A high frequency filter that extracts a frequency magnetic flaw detection signal from the signal obtained from this magnetic probe, a delay circuit that delays the signal obtained from this high frequency filter by the ultrasonic flaw detection time, and a signal from this delay circuit. a sub-transmission ultrasonic transducer that converts the ultrasonic wave K into the ultrasonic receiving transducer; an ultrasonic receiver that amplifies the electric signal obtained from the ultrasonic receiving transducer; 1. A flaw detection device comprising a circuit that separates an output signal from the device into an ultrasonic flaw detection signal and a magnetic flaw detection signal.