Ultrasonic wave phased array testing method for internal defect at bent axle R

A technology for internal defects and detection methods, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, can solve the problems of difficult adjustment, narrow probe adaptation range, etc., to achieve comprehensive detection results, improve detection reliability, and strong practicability. Effect

Inactive Publication Date: 2015-01-14
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The ultrasonic phased array detection system uses electronic technology to control the scanning direction and focus depth of the sound beam. It can realize the same probe to detect different wall thicknesses, different materials, and different shapes of workpieces. It overcomes the conventional multi-probe automatic ultrasonic The shortcomings of the difficulty in adjusting the detection system and the narrow adaptability of the probe

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  • Ultrasonic wave phased array testing method for internal defect at bent axle R

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Embodiment

[0027] Example: such as figure 1 As shown, the ultrasonic phased array detection method for internal defects at the crankshaft R includes the following steps:

[0028] (1) Clean the journal surface of the crankshaft 3, and maintain the surface roughness at Ra≤6.3μm;

[0029] (2) Select the probe and wedge. In production practice, select the corresponding wedge according to the crankshaft of different specifications to ensure the coupling between the probe and the crankshaft journal. Since the detection surface is a curved surface, in order to ensure good coupling, the chip area should be selected For smaller probes, it is advisable to choose a one-dimensional line array probe with 8 or 16 elements, and choose a suitable wedge;

[0030] (3) Debug the probe, the debugging process includes sound velocity and zero point, delay, sensitivity calibration, ACG calibration (angle gain compensation), TCG calibration (time gain calibration);

[0031] (4) Select the scanning angle accor...

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Abstract

The invention discloses an ultrasonic wave phased array testing method for an internal defect at a bent axle R. On the basis of a conventional bent axle nondestructive testing process, the phased array testing method of a one-dimensional linear array probe with automatic deflection and focusing functions is applied to the detection of the bent axle, wherein a proper wedge block is additionally arranged on the one-dimensional linear array probe. The ultrasonic wave phased array testing method has the beneficial effects that the defect of the detection of a conventional process is solved, the internal defects at a shaft neck and an R corner by adopting one probe, the detection reliability and the detection efficiency are maximally improved; the defects of cracks, inclusion, pores and the like with sizes of above 1mm inside the shaft neck and at the R corner can be detected, and the internal defect of an arc at the bent axle R corner can be conveniently and effectively detected.

Description

technical field [0001] The invention relates to an ultrasonic phased array detection method, in particular to an ultrasonic phased array detection method for internal defects at R of the crankshaft. Background technique [0002] The crankshaft is the main moving part of the engine, which is subject to complex alternating loads and impacts, and is prone to fatigue cracks. [0003] The traditional non-destructive testing process for internal defects at crankshaft R is conventional ultrasonic shear wave oblique probe testing. In the actual production process, it is found that the traditional detection method cannot detect all the crankshaft defects, such as internal flake defects perpendicular to the detection surface (or at a certain angle to the detection surface), and special position defects (referring to R arc internal defects) etc. According to the conventional ultrasonic testing method, multiple testing probes need to be replaced, and the short journal makes it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 陆铭慧邓勇潘文超刘勋丰
Owner NANCHANG HANGKONG UNIVERSITY
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