Ultrasonic C scanning detection method for axial defects of hollow cylindrical test piece
A test piece, ultrasonic technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, use sound waves/ultrasonic waves/infrasonic waves for material analysis, measuring devices, etc., to achieve comprehensive detection results
Inactive Publication Date: 2019-02-22
BEIJING UNIV OF TECH
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[0004] Ultrasonic scanning is carried out in the way that the specimen is stationary and the probe is moving, which may be ignored because the growth direction of internal cracks is parallel to the direction of the ultrasonic beam
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[0014] The specific embodiment of the present invention is described in detail below:
[0015] Such as figure 1 As shown, the water immersion rotary scanning device is composed of a water tank 1, a fixed nut 2, a motor 3 and a rotating shaft 5. The test piece 4 is installed on the rotating shaft 5 through the fixing nut 2, and the water tank 1 is filled with water so that the test piece 4 was completely submerged.
[0016] The computer controls the motor 3 to start rotating at a preset step angle, and the output shaft of the motor 3 is connected to the rotating shaft 5; the ultrasonic water immersion probe is installed on the scanning frame above the specimen 4, and the ultrasonic water immersion probe is in the center The upper part scans reciprocally along the axial direction of the rotating shaft 5 . The ultrasonic water immersion probe scans once, and the test piece 4 rotates by a step angle, and after the test piece 4 rotates one circle, the scanning ends.
[0017] Suc...
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The invention discloses an ultrasonic C scanning detection method for axial defects of a hollow cylindrical test piece. The method comprises the following steps: first, mounting the hollow cylindricaltest part on a water logging rotary scanning device; rotating the test piece to a preset stepping angle to be scanned by an ultrasonic water logging probe once till the test piece rotates one revolution; and finally, carrying out tomographic operation to the test piece to detect the axial defects of the hollow cylindrical test piece. The method can find some defects which are hardly found by a conventional scanning method and is more comprehensive in detection. The method can solve the problem. The hollow cylindrical test piece which is placed flatly to be scanned rotates along the axis of the hollow cylindrical test piece, the probe scans the hollow cylindrical test piece in a reciprocating manner above, and the imaging result is equivalent to the result of unfolding the original hollowcylindrical test piece into a rectangle, so that inner defects can be detected all around.
Description
technical field [0001] The invention relates to an ultrasonic C-scan detection method for axial defects of a hollow cylinder test piece, which is suitable for the fields of ultrasonic scanning microscope detection and ultrasonic C-scan detection. Background technique [0002] Ultrasonic scanning is a nondestructive testing method for detecting internal defects of materials. It has the advantages of high resolution, intuitive test results, and high detection efficiency. Due to the imperfect manufacturing process of some test pieces, defects such as holes, cracks, inclusions, and uneven particle distribution of the mixture will appear inside the test piece, which will weaken the mechanical properties of the material, reduce the performance of the structure, and even cause serious damage. Consequences, so ultrasonic testing can be used for quality control. [0003] The principle of ultrasonic C-scan imaging is to generate a cross-sectional view of the defect on the x-y two-dim...
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IPC IPC(8): G01N29/06G01N29/265
CPCG01N29/0672G01N29/0681G01N29/265G01N2291/0289G01N2291/262
Inventor 宋国荣黎耀谦吕炎吴斌何存富
Owner BEIJING UNIV OF TECH