CN114324573A - Method for detecting internal defects of forge piece by ultrasonic pulse reflection - Google Patents
Method for detecting internal defects of forge piece by ultrasonic pulse reflection Download PDFInfo
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- CN114324573A CN114324573A CN202011055649.5A CN202011055649A CN114324573A CN 114324573 A CN114324573 A CN 114324573A CN 202011055649 A CN202011055649 A CN 202011055649A CN 114324573 A CN114324573 A CN 114324573A
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- 230000007547 defect Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000523 sample Substances 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000005242 forging Methods 0.000 claims abstract description 12
- 230000001902 propagating effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000009683 ultrasonic thickness measurement Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting internal defects of a forging by ultrasonic pulse reflection, which is characterized by comprising the following forging steps: providing a thickness measuring probe, which structurally comprises a main body part, a probe wafer, a liquid inlet and a liquid outlet; the thickness measuring probe has the functional characteristics of transmitting and receiving ultrasonic waves, the ultrasonic waves have higher frequency and narrow ultrasonic pulses, the thickness measuring probe is connected to a conventional pulse reflection type ultrasonic instrument and has the function of using and receiving the electric pulses, when the transmitting voltage of the instrument is applied to a wafer of the thickness measuring probe, the probe generates high-frequency vibration and transmits the ultrasonic waves into a forge piece through a coupling medium, when the ultrasonic waves meet a reflection interface in the propagation process, the reflected ultrasonic waves reversely act on the wafer of the probe to generate a piezoelectric effect, and the electric signals are processed and displayed by the ultrasonic instrument, so that the purpose of detecting defects by the conventional flaw detection probe is achieved, and the thickness measuring probe is particularly suitable for detecting the forge piece with small thickness.
Description
Technical Field
The invention relates to a defect detection method, in particular to a method for detecting internal defects of a forging by ultrasonic pulse reflection.
Background
Ultrasonic thickness measurement is a complement to other mechanical dimension measurements, and is used for measuring the length dimension under the condition that one end point in the length direction cannot be touched. The thickness of the forging is measured by utilizing the propagation time of the ultrasonic waves in the object, the probe also has the functions of transmitting and receiving the ultrasonic waves, and the ultrasonic waves cannot be received if the ultrasonic waves are blocked by defects in the propagation process.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a method for detecting internal defects of a forging by ultrasonic pulse reflection using a thickness measurement technique will be provided.
In order to solve the problems, the invention adopts the technical scheme that: the method for detecting the internal defects of the forged piece by adopting ultrasonic pulse reflection comprises the following steps:
manufacturing an ultrasonic thickness measuring probe; the forging is subjected to flaw detection by adopting an ultrasonic thickness measuring probe, detection liquid flows in from a liquid inlet, flows in from a liquid outlet and is contacted with the forging, ultrasonic waves are fed back to a probe wafer through the detection liquid, and the shape of the ultrasonic waves is displayed on a computer; in the ultrasonic display, the distance between the initial wave and the interfacial wave is the distance of the ultrasonic wave propagating in the liquid path of the probe, the distance between the interfacial wave and the primary bottom wave is the propagation distance of the ultrasonic wave in the forged piece, and when the defect wave between the interfacial wave and the primary bottom wave or between the primary bottom wave and the secondary bottom wave is a defect in the forged piece, the reflected wave from the surface of the defect can be received by the probe to be a defect reflection signal.
Furthermore, the thickness measuring probe consists of a main body part, a probe wafer, a liquid inlet and a liquid outlet.
Compared with the prior art, the invention has the following beneficial effects:
the method for detecting the internal defect of the forging by adopting ultrasonic pulse reflection utilizes the characteristic that a thickness measuring probe has the function of transmitting and receiving ultrasonic waves, the ultrasonic frequency is higher, the ultrasonic pulse is narrow, the thickness measuring probe is connected to a conventional pulse reflection type ultrasonic instrument, the function of using and receiving the electric pulse is utilized, when the transmitting voltage of the instrument is applied to a wafer of the thickness measuring probe, the probe generates high-frequency vibration and transmits the ultrasonic waves into the forging through a coupling medium, when the ultrasonic waves meet a reflection interface in the transmission process, the reflected ultrasonic waves act on the wafer of the probe in a reverse direction to generate a piezoelectric effect, and the electric signals are processed and displayed by the ultrasonic instrument, so that the purpose of detecting the defect by using the conventional flaw detection probe is achieved, and the method is particularly suitable for detecting the forging with small thickness.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of a thick gauge probe;
FIG. 2 is an ultrasonic display diagram of a thickness measuring probe for detecting forging defects.
Detailed Description
The method for detecting the internal defects of the forged piece by adopting ultrasonic pulse reflection comprises the following steps:
a thickness measuring probe is provided, which comprises a main body part 1, a probe wafer 2, a liquid inlet 3 and a liquid outlet 4. The forged piece is subjected to flaw detection by adopting an ultrasonic thickness detection probe, detection liquid flows in from the liquid inlet 3 and flows in from the liquid outlet 4 and contacts with the forged piece, ultrasonic waves are fed back to the probe wafer 2 through the detection liquid, and the shape of the ultrasonic waves is displayed on a computer; in the ultrasonic display, the distance between the start wave 11 and the interface wave 12 is the distance of the ultrasonic wave propagating in the liquid path of the probe, the distance between the interface wave 12 and the primary bottom wave 13 is the propagation distance of the ultrasonic wave in the forged piece, and the defect wave 14 between the interface wave 12 and the primary bottom wave 13 or between the primary bottom wave 13 and the secondary bottom wave 15 is a defect reflection signal when a defect exists in the forged piece, and when the defect surface is inclined to the propagation direction of the ultrasonic wave, the reflected wave on the defect surface can be received by the probe, and the propagation of the ultrasonic wave can be blocked, so that the bottom wave signal is reduced, and the defect can also be found.
Claims (2)
1. A method for detecting internal defects of a forging by adopting ultrasonic pulse reflection is characterized by comprising the following steps:
manufacturing an ultrasonic thickness measuring probe; detecting the flaw of the forged piece by adopting an ultrasonic thickness detection probe, wherein detection liquid flows in from a liquid inlet, flows in from a liquid outlet and is contacted with the forged piece, ultrasonic waves are fed back to a probe wafer through the detection liquid, and the shape of the ultrasonic waves is displayed on a computer; in the ultrasonic display, the distance between the start wave and the interface wave is the distance of the ultrasonic wave propagating in the liquid path of the probe, the distance between the interface wave and the primary bottom wave is the propagation distance of the ultrasonic wave in the workpiece, and the defect wave between the interface wave and the primary bottom wave or between the primary bottom wave and the secondary bottom wave is a defect in the workpiece, when the defect surface has a defect, the reflected wave from the defect surface can be received by the probe as a defect reflection signal.
2. The method for detecting the internal defects of the forged piece by ultrasonic pulse reflection according to claim 1, wherein the method comprises the following steps: the thickness measuring probe consists of a main body part, a probe wafer, a liquid inlet and a liquid outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011055649.5A CN114324573A (en) | 2020-09-29 | 2020-09-29 | Method for detecting internal defects of forge piece by ultrasonic pulse reflection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011055649.5A CN114324573A (en) | 2020-09-29 | 2020-09-29 | Method for detecting internal defects of forge piece by ultrasonic pulse reflection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114324573A true CN114324573A (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011055649.5A Pending CN114324573A (en) | 2020-09-29 | 2020-09-29 | Method for detecting internal defects of forge piece by ultrasonic pulse reflection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114324573A (en) |
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2020
- 2020-09-29 CN CN202011055649.5A patent/CN114324573A/en active Pending
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220412 |
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| WD01 | Invention patent application deemed withdrawn after publication |