Method for precise and rapid detection of internal deformation of a component and detection device therefor

Abstract

The application discloses a precision and rapid detection method for internal deformation of a component and a detection device thereof, and is used for deformation evaluation and detection of an inner hole diameter of a large engineering metal device such as an electromagnetic gun. The device comprises coaxially arranged double-layer sensors, one eddy current detection sensor and one capacitance detection sensor, and a flexible metal layer arranged in a concentric circle and covering the periphery of the sensors. The electromagnetic eddy current signal data and the capacitance value parameter of the double-layer sensors are simultaneously detected and analyzed to evaluate the overall deformation condition, and the detection method for detecting the deformation in the hole is performed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nondestructive testing, in particular to a nondestructive testing evaluation method for the inner hole of an engineering metal part, and more particularly to a precise and rapid detection method for internal deformation of a part and a detection device thereof. BACKGROUND

[0002] In some engineering parts, there are long inner holes, and with the passage of time, the holes of these engineering devices are prone to deformation to varying degrees. For example, electromagnetic rail guns, each shot of a projectile causes a strong support pressure on the inner hole of the rail, and over time, the originally circular long inner hole will deform, resulting in impaired performance indicators. Therefore, how to quickly and effectively detect it precisely and then evaluate whether it meets the requirements of actual combat has become an urgent engineering application problem for this equipment.

[0003] To solve the above problems, the present application uses the following technical solutions for further improvement. SUMMARY

[0004] The purpose of the present application is to provide a precise and rapid detection method for internal deformation of a part and a detection device thereof, and the disclosed technical solution is as follows:

[0005] A precise and rapid detection method for internal deformation of a part is used for deformation evaluation and detection of the inner hole diameter of large engineering metal devices such as electromagnetic guns, etc. Through the coaxial arrangement of double-layer sensors, one layer of eddy current detection sensors and one layer of capacitive detection sensors, and the flexible metal layer arranged concentrically around the periphery of the sensors, the electromagnetic eddy current signal data and the capacitance value parameters of the double-layer sensors are simultaneously detected and analyzed to evaluate the overall deformation and detect the deformation in the hole. The specific detection and evaluation analysis steps are as follows:

[0006] a. Turn on the detection device: turn on the double-layer sensor device and place it in the detected hole for scanning detection;

[0007] b. Start eddy current detection: start the eddy current sensor detection device, extract the lift-off signal value between the eddy current detection sensor and the flexible metal layer from the detection instrument, and perform comparative analysis and data processing;

[0008] c. Start capacitive detection: start the capacitive plate sensor detection device, extract the capacitance signal value between the sensor plate and the flexible metal layer from the detection instrument, and perform comparative analysis and data processing;

[0009] d. In-hole deformation defect extraction: comparative analysis of eddy current lift-off signal data and capacitance value detection data to form in-hole deformation defect signal data, stored and displayed on the detection and analysis instrument. Because the eddy current detection signal is sensitive to lift-off, and the capacitance sensor is quite sensitive to spacing under the condition of constant medium and effective normal area, the two signal values are integrated and analyzed to evaluate the in-hole deformation. In the detection device, the eddy current detection sensor coil is attached to the flexible metal layer, and the capacitance metal electrode has a certain spacing with the flexible metal layer, which plays its own specialty and facilitates data fusion and comparative analysis.

[0010] Further, in the d step, when integrating the eddy current lift-off value and the capacitance value of the electrode to analyze the in-hole deformation, the eddy current lift-off value is extracted and analyzed as the small concave-convex block and roughness deformation defect value, and the capacitance value is extracted and analyzed as the defect value of the large block area deformation. After comparative analysis, the in-hole deformation is determined to be small concave-convex block and roughness deformation or large block area deformation. Because the eddy current detection sensor is sensitive to lift-off, it is easier to detect defects when the flexible metal layer has small concave-convex changes, and the capacitance value of the metal electrode type capacitance sensor is only sensitive to the overall spacing value, which is more suitable for analyzing and evaluating the in-hole deformation of large block area.

[0011] Further, in the d step, when integrating the eddy current lift-off value and the capacitance value of the electrode to analyze the in-hole deformation, in the case where the eddy current value does not change significantly, i.e. within a small range of calibration, and the capacitance value changes significantly, i.e. within a large range of calibration, it is determined that the hole diameter is a large block area deformation. Because the lift-off value of the eddy current detection sensor coil changes relatively small in the condition of large area deformation, and the capacitance value of the electrode changes relatively large when the angle changes and the normal area changes.

[0012] Further, in the d step, when integrating the eddy current lift-off value and the capacitance value of the electrode to analyze the in-hole deformation, in the case where the eddy current value changes significantly, i.e. within a large range of calibration, and the capacitance value does not change significantly, i.e. within a small range of calibration, it is determined that the hole diameter is a small concave-convex rough deformation. Similarly, the small concave-convex roughness of the hole diameter can cause a large change in the lift-off value of the eddy current detection sensor coil, and the capacitance value of the electrode changes relatively small when the normal area changes.

[0013] The application also discloses a precision and rapid detection device for internal deformation of a component, which is used for deformation evaluation and detection of an inner hole diameter of a large engineering metal device (1), such as an electromagnetic gun, and comprises a double-layer sensor arranged in concentric circles, one eddy current detection sensor (21) and one capacitance detection sensor (22), and a flexible metal layer (23) arranged in the periphery of the sensor and covered by the concentric circles, and the electromagnetic eddy current signal data and the capacitance value parameter of the double-layer sensor are simultaneously detected and analyzed to evaluate the overall deformation and detect the deformation in the hole, wherein the detection device (2) comprises a detection instrument (3), a support (4), a handle (5), the eddy current detection sensor (21) and the capacitance detection sensor (22), and is characterized in that the eddy current detection sensor (21) and the capacitance detection sensor (22) are arranged as a plurality of eddy current coils (211) and capacitance plates (221) in coaxial circular arrays on the support (4), and further comprising a flexible metal layer (23) arranged in the outer layer of the coaxial circular arrays of the plurality of eddy current coils (211) and capacitance plates (221).

[0014] Further, the eddy current coils (211) and the capacitance plates (221) are arranged in an axial side-by-side manner, and the eddy current coils (211) and the capacitance plates (221) have a certain spacing from the flexible metal layer (23).

[0015] Further, the respective expertise is exerted, and the data fusion and comparative analysis are more convenient.

[0016] Further, the capacitance plates (221) and the eddy current coils (211) are arranged in inner and outer concentric circles, the outer layer is the eddy current detection sensor, the inner layer is the capacitance detection sensor, and the concentric circles comprise the flexible metal layer (23) arranged in the outer layer sensor, the rough surface of the pipe inner diameter is evaluated by detecting and analyzing the eddy current lift-off value parameter of the flexible metal layer and the outer layer sensor, and the overall deformation is evaluated by the capacitance value parameter between the inner layer sensor and the outer layer sensor, and the small concave-convex block roughness or large area deformation of the hole diameter is distinguished.

[0017] Further, the eddy current coils (211) and the capacitance plates (221) arranged in the inner and outer concentric circles are provided with a spacing layer (24), and the spacing layer is arranged in a circle flush with the front end of the support (4).

[0018] Further, the interval layer (24) is an elastically deformable annular ring made of flexible material. The interval layer (24) can also be arranged to be thinner than the part of the bracket (4), and more easily deformed to form a buffer during movement. When the movable detection device is pushed to move to scan the inner diameter of the detection hole, the outer flexible metal layer and the eddy current coil (211) are relatively moved with the capacitor plate (221) due to the flexible and elastic deformation of the interval layer, and the capacitance value changes obviously. When the defect to be detected is a small concave-convex surface, the outer flexible metal layer produces a small elastic deformation, which greatly affects the lift-off value of the eddy current coil, and the facing area of the capacitor changes relatively small. Especially in the process of continuous scanning, the capacitance value change in a long time period is set as the large area deformation of the inner diameter of the hole, and the change in a short time is set as the small concave-convex deformation.

[0019] According to the above technical scheme, the present application is a kind of component internal deformation precision rapid detection method and its detection device, through the cylindrical bracket, the double-layer sensor arranged concentrically inside and outside, the eddy current detection sensor and the capacitance detection sensor, and the flexible metal layer arranged on the outer layer of the sensor, the eddy current lift-off value parameter of the flexible metal layer and the outer sensor is evaluated to evaluate the rough surface of the pipe inner diameter, and the capacitance value parameter between the inner sensor and the outer sensor is evaluated to evaluate the overall deformation, to distinguish whether the pipe inner diameter is small concave-convex rough deformation or large area deformation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the detection device in use according to the best embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the detection device structure according to the best embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the detection device in use according to the best embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the detection device according to the best embodiment of the present application.

[0024] Figure 5 It is a schematic diagram of the detection device according to the best embodiment of the present application.

[0025] Figure 6 It is a schematic diagram of the detection device according to the best embodiment of the present application.

[0026] Figure 7 It is a schematic diagram of the detection device according to the best embodiment of the present application.

[0027] Figure 8 It is a schematic diagram of the detection method according to the best embodiment of the present application.

[0028] Figure 9 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view;

[0029] Figure 10 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view;

[0030] Figure 11 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view;

[0031] Figure 12 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view;

[0032] Figure 13 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view;

[0033] Figure 14 Another embodiment of the detection device of the best embodiment of the present application is shown in a schematic view. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0035] As Figures 1 to 14 shown, a precision and rapid detection method for internal deformation of a component is used for deformation evaluation and detection of an inner hole diameter 11 of a large-scale engineering metal device 1 such as an electromagnetic gun, etc. Through coaxially arranged double-layer sensors, one layer of eddy current detection sensor 21 and one layer of capacitive detection sensor 22, and a flexible metal layer 23 arranged concentrically around the periphery of the sensors, the electromagnetic eddy current signal data and the capacitive value parameters of the double-layer sensors are simultaneously detected and analyzed to evaluate the overall deformation, and a detection method for detecting and evaluating the deformation in the hole is performed. The specific detection, evaluation and analysis steps are as follows:

[0036] a. Turn on the detection device: turn on the double-layer sensor device and place it in the detected hole for scanning detection;

[0037] b. Start eddy current detection: start the eddy current sensor detection device, extract the lift-off signal value between the eddy current detection sensor and the flexible metal layer by the detection instrument, and perform comparative analysis data processing;

[0038] c. Start capacitive detection: start the capacitive plate sensor detection device, extract the capacitive signal value between the sensor plate and the flexible metal layer by the detection instrument, and perform comparative analysis data processing;

[0039] d. Extract the deformation defect in the hole: compare and analyze the eddy current lift-off signal data and the capacitive value detection data to form the deformation defect signal data in the hole, and store and display it on the detection and analysis instrument.

[0040] AsFigure 8 As shown, the eddy current coil 211 and the equivalent circuit parameters formed by the capacitor plate 221 and the flexible metal layer 23, because the eddy current detection signal is sensitive to the lift-off, while the capacitance sensor is quite sensitive to the distance under the condition that the medium and the effective facing area are unchanged, the two signal values of the eddy current lift-off value and the capacitance signal are fused and analyzed to evaluate the deformation in the hole. In the detection device, the eddy current detection sensor coil is arranged to adhere to the flexible metal layer, while the capacitance metal plate has a certain distance from the flexible metal layer, which plays their respective specialties while being more convenient for data fusion and comparative analysis.

[0041] As shown in Figure 13 and Figure 14 , when the eddy current lift-off value and the capacitance value of the capacitor plate are fused and analyzed to analyze the deformation in the hole in the d step, the eddy current lift-off value is extracted and analyzed as the small concave and convex block 12 and the roughness deformation defect value, and the capacitance value is extracted and analyzed as the defect value of the deformation 13 in the large block area of the hole. After comparative analysis, it is determined to distinguish whether the deformation in the hole is small concave and convex or roughness deformation or large block area deformation. Because the eddy current detection sensor is sensitive to the lift-off value, it is easier to detect the defect when the flexible metal layer has a small concave and convex change, while the capacitance value of the metal plate type capacitance sensor is only sensitive to the overall distance value, which is more suitable for analyzing and evaluating the deformation in the hole in the large block area.

[0042] One case of analysis and evaluation is that when the eddy current value does not change significantly, i.e. in a smaller range of calibration, and the capacitance value changes significantly, i.e. in a larger range of calibration, it is determined to be a large block area deformation in the hole diameter. Because the lift-off value of the eddy current detection sensor coil changes relatively small in the condition of large area deformation, while the capacitance value of the capacitor plate changes relatively large when the angle changes is not parallel and the facing area changes.

[0043] Another case of analysis and evaluation is that when the eddy current value changes significantly, i.e. in a larger range of calibration, and the capacitance value does not change significantly, i.e. in a smaller range of calibration, it is determined to be a small concave and convex roughness deformation in the hole diameter. Similarly, the small concave and convex roughness in the hole diameter can cause a relatively large change in the lift-off value of the eddy current detection sensor coil, while the capacitance value of the capacitor plate changes relatively small when the facing area changes is not too much.

[0044] As shown in Figure 2 and Figure 3As shown in the above, the present application also discloses a precision rapid detection device for internal deformation of a component, which is used for deformation evaluation and detection of the inner diameter of a large engineering metal device 1 such as an electromagnetic cannon, etc. The device simultaneously detects and analyzes the electromagnetic eddy current signal data and the capacitance value parameter of the double-layer sensor to evaluate the overall deformation, and detects the deformation in the hole. The detection device 2 comprises a detection instrument 3, a bracket 4, a handle 5, an eddy current detection sensor 21 and a capacitance detection sensor 22, which are installed on the bracket 4. The eddy current detection sensor 21 and the capacitance detection sensor 22 are respectively arranged as a plurality of coaxial circular array of eddy current coils 211 and capacitance plates 221. The detection device 2 also comprises a flexible metal layer 23 which is coated on the outer layer of the coaxial circular array of the eddy current coils 211 and the capacitance plates 221.

[0045] As shown in the above, Figure 2 and Figure 3 According to an embodiment, the eddy current coils (211) and the capacitance plates (221) are arranged in an axial side-by-side manner, and the eddy current coils 211 and the capacitance plates 221 have a certain spacing with the flexible metal layer 23. The respective expertise is exerted, and the data fusion and comparative analysis are more convenient.

[0046] As shown in the above, Figure 9 and Figure 10 According to another embodiment, the capacitance plates 221 and the eddy current coils 211 are arranged in an inner-outer concentric circle manner, the outer layer is the eddy current detection sensor, the inner layer is the capacitance detection sensor, and the concentric circle comprises a flexible metal layer 23 which is coated on the outer layer sensor. The rough surface of the inner diameter of the pipe is evaluated by detecting and analyzing the eddy current lift-off value parameter of the flexible metal layer and the outer layer sensor, and the overall deformation is evaluated by the capacitance value parameter between the inner layer sensor and the outer layer sensor, so as to distinguish whether the hole diameter is small concave and convex rough or large area deformation.

[0047] As shown in the above, Figure 11 The interval layer 24 is arranged between the inner-outer concentrically arranged eddy current coils 211 and the capacitance plates 221, and the interval layer is arranged in a circle which is flush with the front end of the bracket 4.

[0048] As shown in the above, Figure 12 The interval layer 24 is an annular ring made of flexible material and can be elastically deformed. The interval layer 24 can also be arranged to be thinner than the bracket 4, so that it is easier to form a deformation buffer during movement, as shown in the above, Figure 14 As shown in the above, when the detection device is pushed to move in the X direction to scan and detect the hole diameter, the detection device 2 moves from the H0 position to the H2 position. When the large area is deformed, the outer layer flexible metal layer and the eddy current coils 211 are elastically deformed due to the interval layer, and the capacitance plates 221 form relative movement, and the capacitance value changes obviously. However, as shown in the above,Figure 13 As shown in the figure, the detection device moves from H0 position to H1 position, when the detected defect is small concave and convex surface, the outer layer flexible metal layer produces small elastic deformation, which has great influence on the lift-off value of the eddy current coil, while the change of the facing area of the capacitor is relatively small. Especially in the process of continuous scanning, by setting the change of the capacitance value for a long period of time, it is determined that the hole diameter belongs to the large area deformation as shown in the figure Figure 14 The change for a short time is determined as the small concave and convex surface deformation as shown in the figure Figure 13

[0049] The above is one of the embodiments of the present application. In addition, it should be noted that any equivalent or simple change made according to the structure, features and principles described in the patent concept is included in the protection scope of the patent.​

Claims

1. A method for precise and rapid detection of internal deformation of a component, by coaxially arranging a double-layer sensor, one layer of eddy current detection sensor and one layer of capacitance detection sensor, and a flexible metal layer arranged concentrically outside the sensor, wherein, The eddy current detection sensor (21) and the capacitance detection sensor (22) are respectively arranged as a plurality of eddy current coils (211) and capacitance plates (221) in a coaxial circular array, and further comprise a flexible metal layer (23) coated outside the plurality of eddy current coils (211) and capacitance plates (221) in the coaxial circular array, the eddy current coils (211) and the capacitance plates (221) are arranged axially side by side, and the eddy current coils (211) and the capacitance plates (221) have a certain spacing with the flexible metal layer (23). The capacitance plates (221) and the eddy current coils (211) are arranged as concentric circles, the inner layer is the eddy current detection sensor, the outer layer is the capacitance detection sensor, and the flexible metal layer (23) is arranged on the outer layer sensor, and the electromagnetic eddy current signal data and the capacitance value parameter of the double-layer sensor are detected and analyzed to evaluate the overall deformation, and a detection method for detecting the deformation in the hole is provided; the specific detection and evaluation analysis steps are as follows: a. Turn on the detection device: turn on the double-layer sensor device and place it in the detected hole for scanning detection; b. Start eddy current detection: start the eddy current sensor detection device, extract the lift-off signal value between the eddy current detection sensor and the flexible metal layer by the detection instrument, and perform comparative analysis data processing; c. Start capacitance detection: start the capacitance plate sensor detection device, extract the capacitance signal value between the sensor plate and the flexible metal layer by the detection instrument, and perform comparative analysis data processing; d. Extract hole deformation defects: compare and analyze the eddy current lift-off signal data and the capacitance value detection data to form hole deformation defect signal data, and store and display on the detection and analysis instrument; When the eddy current lift-off value and the capacitance value of the capacitance plate are fused to analyze the hole deformation, the eddy current lift-off value is used as the small concave-convex block and roughness deformation defect value extraction analysis, and the capacitance value is used as the defect value extraction analysis of the large block area deformation in the hole, and after comparative analysis, the hole deformation is determined to be small concave-convex block and roughness deformation or large block area deformation.

2. The method of claim 1, wherein When the eddy current lift-off value and the capacitance value of the capacitance plate are fused to analyze the hole deformation, in the case that the eddy current value changes is not obvious, i.e. in a small calibrated range, and the capacitance value changes is obvious, i.e. in a large calibrated range, it is determined that the hole diameter is large block area deformation.

3. The method of claim 1, wherein When the eddy current lift-off value and the capacitance value of the capacitance plate are fused to analyze the hole deformation, in the case that the eddy current value changes is obvious, i.e. in a large calibrated range, and the capacitance value changes is not obvious, i.e. in a small calibrated range, it is determined that the hole diameter is small concave-convex roughness deformation.

4. A device for precise and rapid detection of internal deformation of a component, using the detection method according to any one of claims 1 to 3, comprising a detection instrument (3), a support (4), a handle (5), an eddy current detection sensor (21) and a capacitance detection sensor (22), characterized in that The eddy current detection sensor (21) and the capacitance detection sensor (22) are respectively arranged as a plurality of eddy current coils (211) and capacitance plates (221) in a coaxial circular array, and further comprise a flexible metal layer (23) coated outside the plurality of eddy current coils (211) and capacitance plates (221) in the coaxial circular array.

5. The apparatus for precision rapid detection of internal deformation of a component according to claim 4, characterized in that The eddy current coils are arranged on the flexible metal layer, and the capacitance plates have a certain spacing with the flexible metal layer.

6. The apparatus for precision rapid detection of internal deformation of a component according to claim 5, wherein The inner and outer concentric circles are provided with a spacing layer (24) between the eddy current coil (211) and the capacitor electrode plate (221), and the spacing layer is provided as a circle flush with the front end of the support (4).

7. The apparatus for precision rapid detection of internal deformation of a component according to claim 6, characterized in that The spacing layer (24) is an elastically deformable annular ring made of flexible material.

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