CN113375545A - Method and device for detecting surface curvature of metal material - Google Patents
Method and device for detecting surface curvature of metal material Download PDFInfo
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- CN113375545A CN113375545A CN202011086922.0A CN202011086922A CN113375545A CN 113375545 A CN113375545 A CN 113375545A CN 202011086922 A CN202011086922 A CN 202011086922A CN 113375545 A CN113375545 A CN 113375545A
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- G01—MEASURING; TESTING
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Abstract
A detection method and detection device of the surface curvature of a metal material are mainly used for the curvature detection of precise metal parts, are electrically connected with a detection analysis instrument, and comprise a shell (1), a main sensor (2) and an auxiliary sensor (3), wherein the main sensor (2) is positioned at the center of the detection device and is used for detecting the lift-off value relative to a detection surface, and the auxiliary sensor (3) is positioned at the periphery of the main sensor and is arranged on the same plane and is used for detecting the metal conductivity of a detected object (4). The curvature detection of the micro curved surface of the precise metal device is realized by detecting the lift-off value of the detection surface of the detected object.
Description
Technical Field
The invention relates to the technical field of electromagnetic nondestructive testing, in particular to a nondestructive testing sensor device for a metal material, and particularly relates to a method and a device for detecting the surface curvature of the metal material.
Background
In modern industry, precision metal parts are not available, especially in the field of aerospace, the precision requirements of many parts are harsh, the surface unevenness with larger curvature can only be detected by a mechanical method, for a curved surface with micro deformation, at present, the most used detection and analysis instruments with complexity and precision such as a microscope, laser, X ray and the like are complex, the price is quite high, and the requirements for using operators are quite high. Electromagnetic non-destructive inspection techniques are generally used for the detection of defects and discontinuities of precision metal parts, but there is no effective detection method for small curvature changes of the surface of a metal material.
Aiming at the problems of the defects, the invention adopts the following technical scheme to improve.
Disclosure of Invention
The invention aims to provide a detection method and a detection device for the surface curvature of a metal material, and the technical scheme is as follows:
a method for detecting the surface curvature of metal material is mainly used for the curvature detection of precise metal parts, and is characterized in that a used detection device comprises a main sensor which is positioned in the middle position and used for detecting the lift-off value relative to a central detection surface, and an auxiliary sensor which is positioned at the periphery of the main sensor and arranged on the same plane and used for detecting the conductivity of the metal to be detected, and the method comprises the following specific steps:
1) and (3) standard value extraction:
a. the main sensor positioned in the center detects the eddy current lift-off value of the small plane at the central position of the standard test piece;
b. the auxiliary sensors arranged at the periphery of the main sensor detect the conductivity of the material at the positions, and the average value is calculated;
c. analyzing the eddy current lift-off value detected by the main sensor and the conductivity data detected by the auxiliary sensor, calculating a corresponding standard value between the eddy current lift-off value and the curvature of the test piece and a conductivity standard value, and storing the standard values in a detection analyzer;
2) actual detection:
d. the main sensor detects the eddy current lift-off value of the small plane at the central position of the detected object;
e. the auxiliary sensor detects the conductivity values of the materials at all positions, calculates the average value and compares the maximum deviation value;
f. and analyzing the average value and the deviation value of the conductivity detected by the auxiliary sensor by combining the lift-off value signal detected by the main sensor and the material conductivity change data detected by the auxiliary sensor, correcting the lift-off value detected by the main sensor when the conductivity changes due to metal processing and the like, calculating the curvature value of the detected object, displaying the curvature value on a display screen, and alarming when the curvature value exceeds a threshold value.
The auxiliary sensor is annularly surrounded on the main sensor, and the main sensor is arranged on a plane slightly higher than the auxiliary sensor in the center of the ring.
Specifically, the main sensor is provided with a detection probe D at the center, and the auxiliary sensors are provided with three legs arranged on the periphery of the same horizontal plane and arranged on the detection probe A, B, C of the main sensor.
The height distance between the main sensor and the detection surface of the detected object is set to be adjustable, and a numerical signal is adjusted to be sent to the detection analysis instrument.
When more than one main sensor is arranged, the data analysis is carried out on the average value of the lift-off values detected by each main sensor.
In addition, the invention also discloses a detection device for the surface curvature of the metal material, which is mainly used for the curvature detection of a precise metal part (4), is electrically connected with a detection analysis instrument (5), and comprises a shell (1), a main sensor (2) and an auxiliary sensor (3), wherein the main sensor (2) is positioned at the central position of the detection device and is used for detecting the lift-off value relative to a detection surface, and the auxiliary sensor (3) is positioned at the periphery of the main sensor and is arranged on the same plane and is used for detecting the metal conductivity of the detected object (4).
Wherein, auxiliary sensor (3) ring-shaped around in main sensor (2), main sensor (2) set up in the plane that the ring central point put a little higher than auxiliary sensor (3).
More specifically, the main sensor (2) is provided with a detection probe D at the center, and the auxiliary sensors are provided with three detection probes A, B, C which are vertically arranged on the main sensor at the periphery of the same horizontal plane.
In addition, the main sensor (2) further comprises a height adjusting device (21) for adjusting the height distance between the main sensor (2) and the detection surface of the detected object, the height adjusting device (21) is set to be one of a mechanical fine adjustment structure or an electronic automatic adjustment, and the adjusted distance value is sent to a detection analysis instrument (5) of the detection device.
When more than one probe of the main sensor (2) is set, an average value signal of each probe lift-off value is calculated and sent to the detection and analysis instrument (5). A plurality of detection devices can be connected to a detection and analysis instrument (5), and the detection data of the plurality of detection devices are integrated to analyze the curvature condition of a larger plane.
According to the technical scheme, the invention has the following beneficial effects:
the invention adopts the eddy current detection technology to detect the lift-off value of the detection surface of the detected object, thereby realizing the tiny curvature detection of the precise metal device.
The invention utilizes the main detection sensor to be arranged in the center, the auxiliary detection sensor is triangular and is stabilized on a plane, the adjustable structure of the main detection sensor forms the eddy current sensor, and the invention realizes a very stable detection device, and the main detection sensor is arranged on the plane slightly higher than the auxiliary detection sensor, and the height of the main detection sensor is a micro-adjustable structure, thereby realizing the detection suitable for different curvatures.
The auxiliary detection sensor is used as a basis for auxiliary analysis data of the main detection sensor after detecting the conductivity change of the plane around the main detection sensor, the problem of detection deviation caused by small change of local materials of precise metal devices due to the production, manufacturing and processing processes is solved, and the detection accuracy is improved.
And fourthly, the plurality of detection devices are connected to one detection analysis instrument, the detection data of the plurality of detection devices are integrally analyzed, and the curvature detection of a larger plane can be realized.
Drawings
FIG. 1 is a schematic bottom view of a detecting device according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a detecting device suitable for curved surfaces according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the detecting device according to the preferred embodiment of the present invention;
FIG. 4 is a schematic view of the main sensor adjustment mechanism of the detection device in accordance with the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of another embodiment of the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of a standard value extraction process according to the preferred embodiment of the present invention;
FIG. 7 is a schematic diagram of the detection process according to the preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
As shown in fig. 1 to 5, a method for detecting the curvature of a metal material surface is mainly used for detecting the curvature of a precise metal part, and is characterized in that a detection device used comprises a main sensor positioned at the middle position and used for detecting a lift-off value relative to a central detection surface, and an auxiliary sensor positioned at the periphery of the main sensor and arranged on the same plane and used for detecting the conductivity of a metal to be detected, and the method comprises the following specific steps:
1) and (3) standard value extraction:
a. the main sensor positioned in the center detects the eddy current lift-off value of the small plane at the central position of the standard test piece;
b. the auxiliary sensors arranged at the periphery of the main sensor detect the conductivity of the material at the positions, and the average value is calculated;
c. analyzing the eddy current lift-off value detected by the main sensor and the conductivity data detected by the auxiliary sensor, calculating a corresponding standard value between the eddy current lift-off value and the curvature of the test piece and a conductivity standard value, and storing the standard values in a detection analyzer;
2) actual detection:
d. the main sensor detects the eddy current lift-off value of the small plane at the central position of the detected object;
e. the auxiliary sensor detects the conductivity values of the materials at all positions, calculates the average value and compares the maximum deviation value;
f. and analyzing the average value and the deviation value of the conductivity detected by the auxiliary sensor by combining the lift-off value signal detected by the main sensor and the material conductivity change data detected by the auxiliary sensor, correcting the lift-off value detected by the main sensor when the conductivity changes due to metal processing and the like, calculating the curvature value of the detected object, displaying the curvature value on a display screen, and alarming when the curvature value exceeds a threshold value.
As shown in fig. 6, a flow chart for standard value extraction and detection is shown, in which a main sensor performs eddy current detection on a lift-off value of a standard test piece, and a standard curvature value is analyzed and calculated and then stored in a memory of a detection analyzer; the auxiliary sensor detects the conductivity value of the standard test piece, and after calculating the standard average value, the standard test piece is stored in a memory of the detection and analysis instrument.
As shown in fig. 7, in order to detect the object, the main sensor eddy current detects the lift-off value of the object, the auxiliary sensor detects the conductivity value of the object, calculates the average value of the conductivity, compares the maximum deviation value, when the deviation value is larger than the standard threshold, corrects the lift-off value of the object, the curvature data is displayed on the display screen and stored in the memory of the analyzer, when the deviation value is not larger than the standard threshold, the lift-off value of the object is not corrected, the curvature data is directly displayed on the display screen and stored in the memory of the analyzer.
The auxiliary sensor is annularly surrounded on the main sensor, and the main sensor is arranged on a plane slightly higher than the auxiliary sensor in the center of the ring.
Specifically, the main sensor is provided with a detection probe D at the center, and the auxiliary sensors are provided with three legs arranged on the periphery of the same horizontal plane and arranged on the detection probe A, B, C of the main sensor.
The height distance between the main sensor and the detection surface of the detected object is set to be adjustable, and a numerical signal is adjusted to be sent to the detection analysis instrument.
When more than one main sensor is arranged, the data analysis is carried out on the average value of the lift-off values detected by each main sensor.
In addition, as shown in fig. 1, fig. 2 and fig. 3, the invention also discloses a device for detecting the curvature of the surface of the metal material, which is mainly used for detecting the curvature of a precise metal part 4, is electrically connected with a detection analysis instrument 5, and comprises a shell 1, a main sensor 2 and an auxiliary sensor 3, wherein the main sensor 2 is positioned at the center of the detection device and is used for detecting the lift-off value relative to the detection surface, and the auxiliary sensor 3 is positioned at the periphery of the main sensor and is arranged on the same plane and is used for detecting the metal conductivity of the detected object 4.
The auxiliary sensor 3 annularly surrounds the main sensor 2, and the main sensor 2 is arranged on a plane slightly higher than the auxiliary sensor 3 in the center of the ring.
More specifically, as shown in fig. 1, the main sensor 2 is provided with a central detecting probe D, and the auxiliary sensors are provided with three detecting probes A, B, C arranged in a tripod manner on the periphery of the same horizontal plane.
In addition, as shown in fig. 4, the main sensor 2 further includes a height adjusting device 21 for adjusting a height distance between the main sensor 2 and the detection surface of the detected object, the height adjusting device 21 is configured as one of a mechanical fine adjustment structure or an electronic automatic adjustment, and an adjusted distance value is transmitted to the detection analysis instrument 5 of the detection device.
In another embodiment, as shown in fig. 5, when one or more probes of the main sensor 2 are provided, three probes are provided in the figure, and an average value signal for calculating the lift-off value of each probe is transmitted to the detection analyzer 5.
A plurality of detection devices can be connected to a detection and analysis instrument (5), and the detection data of the plurality of detection devices are integrated to analyze the curvature condition of a larger plane.
The above is one embodiment of the present invention. Furthermore, it is to be understood that all equivalent or simple changes in the structure, features and principles described in the present patent concepts are included in the scope of the present patent.
Claims (10)
1. A method for detecting the surface curvature of metal material is mainly used for the curvature detection of precise metal parts, and is characterized in that a used detection device comprises a main sensor which is positioned in the middle position and used for detecting the lift-off value relative to a central detection surface, and an auxiliary sensor which is positioned at the periphery of the main sensor and arranged on the same plane and used for detecting the conductivity of the metal to be detected, and the method comprises the following specific steps:
1) and (3) standard value extraction:
a. the main sensor positioned in the center detects the eddy current lift-off value of the small plane at the central position of the standard test piece;
b. the auxiliary sensors arranged at the periphery of the main sensor detect the conductivity of the material at the positions, and the average value is calculated;
c. analyzing the eddy current lift-off value detected by the main sensor and the conductivity data detected by the auxiliary sensor, calculating a corresponding standard value between the eddy current lift-off value and the curvature of the test piece and a conductivity standard value, and storing the standard values in a detection analyzer;
2) actual detection:
d. the main sensor detects the eddy current lift-off value of the small plane at the central position of the detected object;
e. the auxiliary sensor detects the conductivity values of the materials at all positions, calculates the average value and compares the maximum deviation value;
f. and analyzing the average value and the deviation value of the conductivity detected by the auxiliary sensor by combining the lift-off value signal detected by the main sensor and the material conductivity change data detected by the auxiliary sensor, correcting the lift-off value detected by the main sensor when the conductivity changes due to metal processing and the like, calculating the curvature value of the detected object, displaying the curvature value on a display screen, and alarming when the curvature value exceeds a threshold value.
2. The method according to claim 1, wherein the auxiliary sensor is disposed annularly around the main sensor, and the main sensor is disposed at a position slightly higher than a plane of the auxiliary sensor.
3. The method according to claim 1, wherein the main sensor is a detecting probe D, and the auxiliary sensors are three-legged arranged on the detecting probe A, B, C of the main sensor.
4. The method as claimed in claim 3, wherein the height distance between the main sensor and the detection surface of the object is adjustable, and the adjustment value is transmitted to the detection analyzer.
5. The method according to claim 1, wherein when the number of the main sensors is one or more, the data analysis is performed on an average value of lift-off values detected by the main sensors.
6. The utility model provides a detection device of metal material surface curvature, the electric connection is in detecting analytical instrument (5) mainly used for the curvature detection of accurate metal parts (4), includes casing (1), main sensor (2) and auxiliary sensor (3), its characterized in that main sensor (2) are located detection device's central point for detect the lift-off value for detecting the face, auxiliary sensor (3) are located main sensor periphery, set up and are used for detecting detected object (4) metal conductivity on the coplanar.
7. A device for detecting the surface curvature of a metal material as claimed in claim 6, wherein the auxiliary sensor (3) is annularly surrounded by the main sensor (2), and the main sensor (2) is arranged at a position slightly higher than the plane of the auxiliary sensor (3) at the center of the ring.
8. The apparatus for detecting the surface curvature of a metal material according to claim 6 or 7, wherein the main sensor (2) is provided with a central detecting probe D, and the auxiliary sensors are provided with three legs arranged on the periphery of the same horizontal plane and arranged on the detecting probe A, B, C of the main sensor.
9. The device for detecting the surface curvature of the metal material as claimed in claim 8, wherein the main sensor (2) further comprises a height adjusting device (21) for adjusting a height distance between the main sensor (2) and the detection surface of the detected object, the height adjusting device (21) is configured as one of a mechanical fine adjustment structure or an electronic automatic adjustment, and the adjusted distance value is transmitted to a detection and analysis instrument (5) of the detection device.
10. The apparatus for detecting the surface curvature of a metal material according to claim 6, wherein when the number of the probes of the main sensor (2) is more than one, an average signal of the lift-off values of the probes is calculated and sent to the detecting and analyzing device (5).
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