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Ultrasonic flaw detection method of cracks of connecting rod pin of locomotive wheel set

A flaw detection and ultrasonic technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problem of inability to detect the flaws of connecting rod pins, and achieve the effect of shortening the maintenance cycle of locomotives, ensuring quality and reducing costs.

Inactive Publication Date: 2014-03-26
CSR CHENGDU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide an ultrasonic flaw detection method for cracks in the connecting rod pins of locomotive wheels, so as to achieve the purpose of non-destructive flaw detection for crack defects, and solve the problem that the existing magnetic particle flaw detection method cannot detect the flaws of the connecting rod pins in the assembled state. Technical problems, thereby effectively solving the problems in the above-mentioned prior art

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  • Ultrasonic flaw detection method of cracks of connecting rod pin of locomotive wheel set

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the locomotive wheel pair connecting rod pin 2 has an inner hole with a diameter of 10mm, and its end face is tapered, and one end of it extends into the No. 2 When flaw detection is required, the surface A of the connecting rod pin is used as the scanning surface for ultrasonic flaw detection, such as figure 1 , if there are cracks on the conical surface and cylindrical surface of the connecting rod pin, it is easy to be detected; if the detected crack is located on the connecting rod pin 2 in the second part 3, as figure 1 In B, the flaw detection is carried out by the ultrasonic flaw detection method described in the present invention.

[0030] The working process of the ultrasonic device is:

[0031] Electrical signal--probe--ultrasonic--parts--ultrasonic emission;

[0032] Ultrasound in the part---probe---electrical signal---ultrasonic reception.

[0033] The ultrasonic probe of the ultrasonic device of the present invention is a spec...

Embodiment 2

[0035] Carry out flaw detection on the connecting rod pin in the assembled state, and the detection method is as follows:

[0036] In the first step, the inner hole of the connecting rod pin is used as the calibration basis for the detection area and detection depth of the ultrasonic flaw detection, that is, distance measurement calibration. First of all, the special ultrasonic probe for connecting rod pins is placed on the detection surface of the test block, and the reflected wave of the incident point of the ultrasonic wave and the reflected wave of the inner hole with a diameter of 10 mm are respectively detected. 10mm inner hole reflected wave for ranging calibration.

[0037] At the same time, the reflected wave of the inner hole of the connecting rod pin is also used as the calibration basis for the comprehensive performance state of the working system during the ultrasonic flaw detection process;

[0038] In the second step, connecting rod pins with natural cracks and...

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Abstract

The invention discloses an ultrasonic flaw detection of cracks of a locomotive wheel set connecting rod pin including a connecting rod pin with an inner hole, the detection method is as follows: a connecting rod pin special-purpose ultrasonic probe is used for flaw detection scanning of the connecting rod pin, the ultrasonic probe incident angle is 1-4 degrees, the focal length is 8mm-12mm, the wafer geometry size is 16mm<2>-100mm<2>, and the frequency is 2MHZ-5MHZ; during the ultrasonic flaw detection, a circular conical surface of an exposed part of the connecting rod pin is used as a flaw detection scanning face, and parts covered or blocked by other members are detected; in flaw detection operation, a moving track of the ultrasonic probe along the circumferential direction is 360 degrees, and the moving speed is 150mm / S; and a moving track along the axial direction is in a range of 0mm-40mm, and the moving speed is 150mm / S. According to the ultrasonic flaw detection method, flaw detection of the cracks of the locomotive wheel set connecting rod pin in an assembled state can be realized, and the ultrasonic flaw detection method not only can be used for the ultrasonic flaw detection of the connecting rod pin in the assembled state, non disintegration state and in-service online state, and can also be used for the ultrasonic flaw detection of the cracks of a single and independent connecting rod pin.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection method for cracks in a connecting rod pin of a locomotive wheel set, and belongs to the technical field of nondestructive flaw detection. Background technique [0002] In the process of heat treatment, machining and assembly of locomotive wheel set connecting rod pins, due to improper technological means, cracks appear on the arc surface of connecting rod pins; during the operation of a certain type of locomotive, the wheel set connecting rod pins occasionally break Accidents have brought safety hazards to locomotive operations. At present, for the detection of connecting rod pins, the requirement is: to conduct magnetic particle inspection on the surface of connecting rod pins, and no cracks are allowed. [0003] In the single-piece and independent finished product state of the connecting rod pin, the magnetic particle inspection is carried out on the detection part to detect the crack defect on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 王蔚明周建孔琦
Owner CSR CHENGDU
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