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Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method

A technology of centrifugal ball and spheroidization rate, which is applied in the direction of using ultrasonic/sonic wave/infrasonic wave, using sound wave/ultrasonic wave/infrasonic wave to analyze solids, measuring devices, etc. Problems such as the difficulty of ultrasonic non-destructive testing of tube wall thickness, etc., to achieve the effect of improving accuracy and reliability, and improving coverage and efficiency

Inactive Publication Date: 2008-05-28
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

These factors have brought great difficulties to the ultrasonic non-destructive testing of centrifugal ductile iron tube spheroidization rate and tube wall thickness, and the detection effect is not good, so far it cannot be practically applied

Method used

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  • Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method
  • Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method
  • Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method

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Embodiment Construction

[0037] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solution and the drawings.

[0038] The position to be inspected on the surface of the inspected centrifugal ductile iron pipe 1 is defined as a plane A-A perpendicular to the central axis of the pipe 1 and intersecting the axis at point O. The intersection line of the plane and the pipe is a concentric ring centered on O. The outer diameter D is the outer diameter of the tube, the inner diameter d is the inner diameter of the tube, S=(D-d) / 2 is the wall thickness of the tube, and the ultrasonic transmitting probe 3 is a line focusing water immersion probe. then

[0039] Focal length in coupling medium

[0040] Focal belt width d -6dB =0.71λf / R c

[0041] Where r is the radius of curvature of the probe focusing lens, C l The speed of longitudinal waves in the focusing lens, Acoustic velocity of longitudinal wave in coupling medium 5, wavelength in λ coupl...

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Abstract

The invention belongs to the technical field of nondestructive detection of foundry industry, and relates to method for testing nodularity and wall thickness of centrifugal nodular cast iron tubes through ultrasonic and without deconstructions. The technological characteristics are that a certified orientation relationship between a probe and a tested tube can be guaranteed through a structural design of a sound path and a probe frame. The probe frame is motioned compositely and mutually with the tested tube, and coupling medium in a coupling medium chamber guarantees a dynamic coupling of the ultrasonic. A transmitting mode is adopted to test sound speed of ultrasonic shear waves inside a detecting tube wall, simultaneously an infrared temperature probe is used to test temperature of the detecting tube wall, after the sound speed of the ultrasonic shear waves is corrected by the temperature, the nodularity of the tube wall can be calculated out under normal temperature by the sound speed of the ultrasonic shear waves. The sound speed of the ultrasonic shear waves is transformed into longitudinal wave velocity, and a mode of ultrasonic pulse reflection is used to test the thickness of the tube wall. An effect and a benefit of the invention are that two projects can be tested in one test, influences of the thickness and the temperature to the test of the nodularity can be overcome, and a dynamic test can be used to test the whole surface of the testing tube, which increases testing efficiency and coverage rate.

Description

Technical field [0001] The invention belongs to the technical field of nondestructive testing in the foundry industry, and relates to an ultrasonic nondestructive testing method for the spheroidization rate and wall thickness of a centrifugal ductile iron pipe. Background technique [0002] Centrifugal ductile iron pipes are widely used in water supply and gas supply projects in urban construction. With the expansion of its production scale and output, the detection and control of the casting quality of centrifugal ductile iron pipes has also received attention and attention, especially the detection of spheroidization rate and pipe wall thickness. Because the spheroidization rate directly affects the mechanical properties of the ductile iron, uneven or thin tube wall thickness will easily cause the load-bearing capacity to decrease and cause the tube to burst. [0003] At present, the main methods for testing the casting quality of centrifugal ductile iron pipes in production in...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01B17/00
Inventor 谭家隆刘军民刘萍李喜孟曹兴元高庭满
Owner DALIAN UNIV OF TECH
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