CN103615965A - Eddy-based method for measuring thickness of covering layer on surface of cambered metal with variable curvature - Google Patents
Eddy-based method for measuring thickness of covering layer on surface of cambered metal with variable curvature Download PDFInfo
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- CN103615965A CN103615965A CN201310706493.6A CN201310706493A CN103615965A CN 103615965 A CN103615965 A CN 103615965A CN 201310706493 A CN201310706493 A CN 201310706493A CN 103615965 A CN103615965 A CN 103615965A
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Abstract
The invention discloses an eddy-based method for measuring the thickness of a covering layer on a surface of a cambered metal with variable curvature, which adopts latticed check points of a machinery scanning device for detecting and marking in a locating manner. The method comprises the steps of firstly detecting the surface of a matrix cambered metal without a covering layer and the surfaces of three cambered metals with covering layers with different thicknesses in a locating manner through the latticed check points of the machinery scanning device, making calibration curves corresponding to the thicknesses of the covering layers at all the check points, then detecting the metal workpiece with the covering layer through the machinery scanning device in a locating manner, and calculating to get the accurate thickness value of the covering layer at each check point on the surface of the cambered metal workpiece with variable curvature according to the calibration curves of the thicknesses of the covering layers at all the check points. The thickness of the covering layer on the surface of the cambered metal workpiece with variable curvature is effectively measured.
Description
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Affiliated technical field
The present invention relates to a kind of lossless detection method, particularly relate to a kind of eddy current thickness measuring method of curved metal surface cover thickness of curvature variation.
Background technology
In many important commercial Application, the overlayer on various construction materials surface has protective and ornamental double action for capped matrix conventionally.Yet this tectal thickness is crossed the thin above-mentioned effect that will be difficult to bring into play, the blocked up waste that can cause economically, and also overlayer became uneven is even or do not reach regulation requirement, will produce harmful effect to its multinomial mechanical and physical performance.Therefore,, in coating decoration and quality inspection process, cover thickness is an important control index.
The thickness of the insulating cover of metal material surface of the work adopts eddy current thickness measuring method to measure conventionally, adopts the manual calibration eddy current testing instrument of demarcating of standard thickness sheet to measure cover thickness.The Curved surface metal workpiece overlayer changing for curvature, surface curvature change will cause the variation of eddy current testing signal, conventional eddy current thickness measuring method measuring error is larger.The cover thickness of having relatively high expectations for measuring accuracy is measured, and for example the ceramic layer of aircraft blade surface and rich aluminum layer thickness are measured, and the curvature on blade base surface is different, and conventional eddy current thickness measuring method can not reach testing requirement.Academic theoretical circles have to propose to adopt increases theoretical error calculating compensation method, but because curvature and the conductivity variations of the tested material of reality are indefinite, the impact that the frock of simultaneously popping one's head in precision departs from, causes this error to calculate compensation method and in reality detects, be difficult to implement.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, the eddy current thickness measuring method of the curved metal surface cover thickness that a kind of curvature changes, the method that adopts the latticed check point detection and localization of mechanical scanning device to demarcate, making is for the cover thickness calibration curve of each check point, calculate the overlayer precise thickness value of tectal each check point of Curved surface metal surface of the work of curvature variation, with experimental calibration composition error, and eliminated.
The technical solution adopted for the present invention to solve the technical problems is: the eddy current thickness measuring method of the curved metal surface cover thickness that a kind of curvature changes, comprise following detecting step,
A. intectate Curved surface metal reference block of first-selected making and the tectal Curved surface metal reference block of three stickup different-thickness standards; Described Curved surface metal reference block is identical with structure with tested Curved surface metal workpiece material; Described standard thickness overlayer material is insulating material, has good rigidity and bending property; Three tectal one-tenth-value thickness 1/10s of standard thickness are known, one of them equals the overlayer specific thickness value of tested Curved surface metal workpiece product parameters requirement, other two the overlayer specific thickness values that are less than respectively and are greater than the requirement of tested Curved surface metal workpiece product parameters;
B. Eddy Current Testing Transducer connects eddy current testing instrument, and Eddy Current Testing Transducer is placed in to air, sets up eddy current signal equilibrium point;
C., the scanning action of mechanical scanning device is set, make its controlled vortex flow detecting sensor according to the check point of formulating, accurately location, with constant dynamics pointwise, be close to the intectate Curved surface metal reference block surface making in step a, gather the substrate eddy current signal of each check point, described substrate eddy current signal preserved in eddy current testing instrument record; The surface curvature of check point is different, and the phase and magnitude of the substrate eddy current signal gathering is also different; Described check point is with the latticed intectate Curved surface metal reference block surface that is evenly distributed on, and the spacing between check point and check point requires to set according to accuracy of detection;
D. mechanical scanning device adopts three the tectal Curved surface metal reference block of stickup different-thickness standard surfaces that make in the checking method controlled vortex flow detecting sensor scanning step successively a identical with step c, gather the standard thickness overlayer eddy current signal of three different-thickness of each check point, described standard thickness overlayer eddy current signal preserved in eddy current testing instrument record;
The phase and magnitude of the substrate eddy current signal that e. eddy current testing instrument gathers according to each check point and the standard thickness overlayer eddy current signal of three different-thickness, calculates the cover thickness calibration function curve of making for each check point;
F. mechanical scanning device adopts the scanning action identical with step c, controlled vortex flow detecting sensor is glued with tested tectal tested Curved surface metal surface of the work according to the check point identical with step c and identical constant dynamics pointwise, gathers the tested overlayer eddy current signal of each check point; Eddy current testing instrument, according to making the cover thickness calibration curve for each check point in step e, can calculate the tested tectal one-tenth-value thickness 1/10 of each check point.
The invention has the beneficial effects as follows, a kind of eddy current thickness measuring method of curved metal surface cover thickness of curvature variation is provided, the method that adopts the latticed check point detection and localization of mechanical scanning device to demarcate, first adopt the intectate matrix curved metal surface of the latticed check point detection and localization of mechanical scanning device and three kinds of tectal curved metal surfaces of different-thickness standard, making is for the cover thickness calibration curve of each check point, then by mechanical scanning device detection and localization, there is tectal tested metal works, by the cover thickness calibration curve for each check point, calculate the overlayer precise thickness value of tectal each check point of Curved surface metal surface of the work of curvature variation, efficiently solve a detection difficult problem for the Curved surface metal surface of the work cover thickness of curvature variation.
Below in conjunction with embodiment, the present invention is described in further detail, but the eddy current thickness measuring method of the curved metal surface cover thickness that a kind of curvature of the present invention changes is not limited to embodiment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the detection schematic diagram of the embodiment of the present invention.
In figure, 1. mechanical scanning device, 2. Eddy Current Testing Transducer, 3. tested Curved surface metal workpiece, 4. latticed equally distributed check point.
Embodiment
In embodiment shown in Fig. 1, the eddy current thickness measuring method of the curved metal surface cover thickness that a kind of curvature changes, comprises following detecting step,
A. intectate Curved surface metal reference block of first-selected making and the tectal Curved surface metal reference block of three stickup different-thickness standards; Described Curved surface metal reference block is identical with structure with tested Curved surface metal workpiece material; Described standard thickness overlayer material is insulating material, has good rigidity and bending property; Three tectal one-tenth-value thickness 1/10s of standard thickness are known, one of them equals the overlayer specific thickness value of tested Curved surface metal workpiece product parameters requirement, other two the overlayer specific thickness values that are less than respectively and are greater than the requirement of tested Curved surface metal workpiece product parameters;
B. Eddy Current Testing Transducer 2 connects eddy current testing instrument, and Eddy Current Testing Transducer is placed in to air, sets up eddy current signal equilibrium point;
C., the scanning action of mechanical scanning device 1 is set, make its controlled vortex flow detecting sensor 2 according to the check point of formulating, accurately location, with constant dynamics pointwise, be close to the intectate Curved surface metal reference block surface making in step a, gather the substrate eddy current signal of each check point, described substrate eddy current signal preserved in eddy current testing instrument record; The surface curvature of check point is different, and the phase and magnitude of the substrate eddy current signal gathering is also different; Described check point 4 is with the latticed intectate Curved surface metal reference block surface that is evenly distributed on, and the spacing between check point 4 and check point 4 requires to set according to accuracy of detection;
D. mechanical scanning device 1 adopts three the tectal Curved surface metal reference block of stickup different-thickness standard surfaces that make in checking method controlled vortex flow detecting sensor 2 a of scanning step successively identical with step c, gather the standard thickness overlayer eddy current signal of three different-thickness of each check point 4, described standard thickness overlayer eddy current signal preserved in eddy current testing instrument record;
The phase and magnitude of the substrate eddy current signal that e. eddy current testing instrument gathers according to each check point and the standard thickness overlayer eddy current signal of three different-thickness, calculates the cover thickness calibration function curve of making for each check point 4;
F. mechanical scanning device 1 adopts the scanning action identical with step c, controlled vortex flow detecting sensor 2 is glued with tested tectal tested Curved surface metal surface of the work according to the check point 4 identical with step c and identical constant dynamics pointwise, gathers the tested overlayer eddy current signal of each check point 4; Eddy current testing instrument, according to making the cover thickness calibration curve for each check point 4 in step e, can calculate the tested tectal one-tenth-value thickness 1/10 of each check point 4.
Above-described embodiment is only used for further illustrating the eddy current thickness measuring method of the curved metal surface cover thickness that a kind of curvature of the present invention changes; but invention is not limited to embodiment; any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all fall in the protection domain of technical solution of the present invention.
Claims (1)
1. an eddy current thickness measuring method for the curved metal surface cover thickness that curvature changes, is characterized in that: comprise following detecting step,
A. intectate Curved surface metal reference block of first-selected making and the tectal Curved surface metal reference block of three stickup different-thickness standards; Described Curved surface metal reference block is identical with structure with tested Curved surface metal workpiece material; Described standard thickness overlayer material is insulating material, has good rigidity and bending property; Three tectal one-tenth-value thickness 1/10s of standard thickness are known, one of them equals the overlayer specific thickness value of tested Curved surface metal workpiece product parameters requirement, other two the overlayer specific thickness values that are less than respectively and are greater than the requirement of tested Curved surface metal workpiece product parameters;
B. Eddy Current Testing Transducer connects eddy current testing instrument, and Eddy Current Testing Transducer is placed in to air, sets up eddy current signal equilibrium point;
C., the scanning action of mechanical scanning device is set, make its controlled vortex flow detecting sensor according to the check point of formulating, accurately location, with constant dynamics pointwise, be close to the intectate Curved surface metal reference block surface making in step a, gather the substrate eddy current signal of each check point, described substrate eddy current signal preserved in eddy current testing instrument record; The surface curvature of check point is different, and the phase and magnitude of the substrate eddy current signal gathering is also different; Described check point is with the latticed intectate Curved surface metal reference block surface that is evenly distributed on, and the spacing between check point and check point requires to set according to accuracy of detection;
D. mechanical scanning device adopts three the tectal Curved surface metal reference block of stickup different-thickness standard surfaces that make in the checking method controlled vortex flow detecting sensor scanning step successively a identical with step c, gather the standard thickness overlayer eddy current signal of three different-thickness of each check point, described standard thickness overlayer eddy current signal preserved in eddy current testing instrument record;
The phase and magnitude of the substrate eddy current signal that e. eddy current testing instrument gathers according to each check point and the standard thickness overlayer eddy current signal of three different-thickness, calculates the cover thickness calibration function curve of making for each check point;
F. mechanical scanning device adopts the scanning action identical with step c, controlled vortex flow detecting sensor is glued with tested tectal tested Curved surface metal surface of the work according to the check point identical with step c and identical constant dynamics pointwise, gathers the tested overlayer eddy current signal of each check point; Eddy current testing instrument, according to making the cover thickness calibration curve for each check point in step e, can calculate the tested tectal one-tenth-value thickness 1/10 of each check point.
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| CN106500581A (en) * | 2016-11-01 | 2017-03-15 | 中国核动力研究设计院 | The measuring method of non-ferromagnetic metal coated layer thickness on a kind of non-ferromagnetic metal |
| CN108267502A (en) * | 2016-12-30 | 2018-07-10 | 大众汽车自动变速器（大连）有限公司 | The eddy detection system and detection method of case depth |
| CN117553730A (en) * | 2024-01-12 | 2024-02-13 | 山东三牛机械集团股份有限公司 | Fan impeller detection mechanism |
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