Measuring and testing – Vibration – By mechanical waves
Patent
1992-08-28
1995-04-04
Chilcot, Jr., Richard E.
Measuring and testing
Vibration
By mechanical waves
73621, G01N 2926
Patent
active
054026822
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to a rotor of an ultrasonic test device for rotationally symmetrical test specimens, especially tubes, in which the rotor holds a probe carrier, which a) is arranged in a radial borehole, b) contains at least one probe, c) is mounted in such a way that it can be moved longitudinally in the direction of the axis of the borehole, and d) is tightly sealed in the borehole.
2. Prior Art
Test devices of this type are already well known for testing along the entire length of the test specimen and/or only for testing the end regions of a test specimen. Testing over the entire length of the test specimen is generally performed in continuous operation; the rotor remains fixed in its position as it rotates, and the test specimen is moved axially through the rotor along its longitudinal axis. For general information on the state of the art, the reader is referred to the book: J. and H. Krautkraimer, Werkstoffprufung mit Ultraschall [Material Testing with Ultrasound], 5th Ed., Springer Verlag, especially the section entitled "Tubes," which describes test systems for tubes.
Test devices of this kind are intended for rotationally symmetric test specimens of a general type, including not only round material, especially tubes and bars, but also material with regular polygonal cross sections, such as hexagonal bars. In this connection, see DE-A-38 03 151 and the unpublished document DE-A-39 08 967.
A rotor of the type mentioned above is used in the prior-art rotation test system for tubes between 20 and 180 mm in diameter, type ROT 180, manufactured by Krautkraimer GmbH & Co. Its two end regions are sealed from the test specimens in such a way that the central borehole of the rotor can be filled with water or other suitable probe-to-specimen contact fluid. The probe carrier is movably mounted in a radial borehole of the rotor arranged transverse to the axis of the test specimen. The probe carrier itself is designed as a type of piston. Test specimens of varying diameters can be systematically positioned by radial movement. In addition, the probe can be retracted to a protected position before a test specimen is run in. The central borehole is also sealed radially towards the outside, in the region of the probe carrier, by a seal between the borehole and the probe carrier. This also prevents contact fluid from escaping radially to the outside.
This previously known device can detect longitudinal and cross-sectional errors, and wall thickness can also be determined. Oblique errors in the test specimen cannot be reliably determined.
SUMMARY OF THE INVENTION
This is where the invention comes in. The goal of the invention was to modify the previously known rotor of the type described above in such a way that, in addition to the existing testing possibilities, it would also be possible to perform oblique error testing in ultrasonic rotation test systems.
This goal is accomplished by mounting the probe carrier within the borehole in such a way that it can be rotationally adjusted about the axis of this borehole. Rotation of the probe carrier in its borehole was neither possible nor suitable in the state of the art, since in the previously known alignment of the probes, no physical effect was achieved by a rotation. However, especially in combination with an angle probe or an inclination-adjustable probe, the acoustic irradiation angle can be additionally adjusted by the rotation of the probe carrier. In this way, it is possible to achieve test paths for rotors that range continuously between every test spiral pitch (between pure cross-sectional testing with circular test path and pure longitudinal testing with a test path in the longitudinal direction).
In a preferred modification, the inclination of the probe can be adjusted about an axis of rotation transverse to the axis of the borehole of the rotor, the probe has a first screw part located outside of this axis of rotation, and this first screw part is associated with a second screw part, which ext
REFERENCES:
patent: 3789656 (1974-02-01), Miller
Chilcot Jr. Richard E.
Felber Joseph L.
Krautkramer GmbH & Co.
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