CN211402244U - Test block - Google Patents

Abstract

The utility model provides a detection test block, which is used for calibrating an eddy current detection instrument. The material of the detection test block of the eddy current detection instrument is consistent with the material of the workpiece to be detected, and the detection test block of the eddy current detection instrument is provided with a size corresponding to the size of the object to be detected. Consistent hole, the opening of the hole is located on the surface of the test block, and the extension direction of the hole is perpendicular to the surface, and the wall surface of the defined hole is provided with defects, and the defects are in the same form as the defects to be detected on the workpiece to be detected. The inspection test block of the utility model has a hole structure corresponding to the assembly hole of the workpiece to be inspected, and the hole structure is provided with a structure for simulating actual defects. good detection accuracy.

Description

test block

technical field

The utility model relates to the field of aircraft maintenance and manufacture, in particular to a detection test block.

Background technique

Eddy current testing is usually used when testing conductive workpieces on aircraft. The eddy current testing method is a non-destructive testing technology based on electromagnetic induction, which is suitable for the testing of conductive materials and is widely used in civil aviation non-destructive testing. Among them, a test block is needed to calibrate the eddy current testing instrument. Therefore, the test block is an important part of the non-destructive testing of passenger aircraft and the basis for ensuring the safe operation of the aircraft.

The existing workpieces to be inspected are mostly multi-layer metal structures connected by bolts or rivets, and the bolt holes or rivet holes may have defects such as cracks during continuous flight. However, if the eddy current testing instrument is calibrated with the existing test block, the calibrated eddy current testing instrument may not be able to detect the defects in the workpiece to be tested, that is to say, the existing test block cannot meet the calibration requirements of the eddy current testing instrument. .

Therefore, there is a need to provide a test block to at least partially solve the above problems.

Utility model content

The main purpose of the utility model is to provide a detection test block, which can more accurately simulate the workpiece to be tested connected by the connecting piece, and use the detection test block to calibrate the detection instrument, so that the calibrated detection instrument can accurately Complete the inspection of the workpiece to be inspected.

To this end, the present invention provides a detection test block for calibrating an eddy current detection instrument, the eddy current detection instrument is used to detect a workpiece to be tested with a mounting hole, and the material of the detection test block is the same as that of the to-be-detected workpiece. The material of the workpiece is the same, and the detection test block is provided with a hole with the same size as the installation hole, the opening of the hole is located on the surface of the detection test block, and the extension direction of the hole is the same as that of the installation hole. The surface is vertical, and the walls defining the hole are provided with defects, and the defects are in the same form as the defects to be inspected on the workpiece to be inspected.

According to this solution, the test block can simulate the mounting holes on the workpiece to be tested and the defects that may exist in the mounting holes, and the eddy current testing instrument calibrated with such a test block can detect the workpiece more accurately.

In one embodiment, the form includes a size, and the size of the defect is the same as the size of a maximum allowable defect at the mounting hole of the workpiece to be inspected.

According to this solution, the eddy current testing instrument after calibration with the test block can accurately detect whether the defect of the workpiece to be tested exceeds the allowable range.

In one embodiment, the hole penetrates the test block.

In one embodiment, the test block is formed into a cylindrical structure, and the hole penetrates the test block along the axial direction of the cylinder.

According to the above two solutions, the holes can simulate bolt holes, and the bolt connection method is a commonly used connection method on aircraft.

In one embodiment, the defect is arranged symmetrically with respect to the axial direction of the hole; and/or

The defects are arranged symmetrically with respect to a radial direction passing through the center of the hole.

In one embodiment, the number of defects is two, the two defects are symmetrical with respect to the axial direction of the hole, and the shape of the defect is in a cross-section perpendicular to the plane of symmetry of the two defects is a triangle.

In one embodiment, the triangle is a right-angled triangle, and the intersection of the wall defining the hole and the cross-section is collinear with the right-angled side of the right-angled triangle.

According to the above solutions, the setting form of defects is consistent with the form of defects that often appear on the workpiece, which can improve the calibration accuracy of the detection instrument.

In one embodiment, the diameter of the hole is 20.5mm or 22.5mm.

In one embodiment, the holes are holes in the form of bolt holes.

In one embodiment, the defect is a defect in the form of a bevel groove.

In one embodiment, the test block is made of aluminum alloy.

The inspection test block of the utility model has a hole structure corresponding to the assembly hole of the workpiece to be inspected, and the hole structure is provided with defects for simulating actual defects. good detection accuracy.

Description of drawings

For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numbers in the figures refer to the same parts. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention, and have no limiting effect on the scope of the present invention, and the various components in the drawings are not drawn to scale.

Fig. 1 is a top view of a detection test block according to a preferred embodiment of the present invention;

Fig. 2 is the sectional view taken along the A-A line of the detection test block in Fig. 1;

FIG. 3 is a cross-sectional view of the test block in FIG. 1 taken along line B-B.

Detailed ways

Referring now to the accompanying drawings, specific embodiments of the present invention will be described in detail. What is described here is only the preferred embodiment of the present invention, and those skilled in the art can think of other ways to realize the present invention on the basis of the preferred embodiment, and the other ways also fall within the scope of the present invention. scope.

The utility model provides a detection test block for eddy current detection, which is used for calibrating an eddy current detection instrument, and the eddy current detection instrument is used for detecting workpieces with installation holes. Figures 1 to 3 show a preferred embodiment of the test block. The test block 1 can be made of various types of conductive materials, but the material of the test block 1 needs to be consistent with the material of the workpiece to be tested.

After comparing with the geometric characteristics of the workpiece to be tested, a hole 2 with the same size as the mounting hole is machined on the test block 1, and a defect 4 is set on the wall surface 3 of the limiting hole 2. The defect 4 is related to the actual appearance on the workpiece or The actual possible defects are consistent. The defect 4 can be machined by means such as EDM or wire cutting.

The hole 2 of the test block 1 can simulate the mounting hole of the workpiece, so the eddy current testing instrument that is calibrated by using the test block 1 is suitable for the detection of workpieces with mounting holes, and can have a higher performance in the actual detection of such workpieces. accuracy.

Preferably, the size of the defect 4 may be the same as the maximum size of an acceptable defect at the mounting hole of the workpiece. In this way, after the calibration is completed, if the eddy current testing instrument actually detects a larger amplitude value, it proves that the defect at the mounting hole of the workpiece has exceeded the acceptable range.

Wherein, the mounting hole on the workpiece can be, for example, a bolt hole, then the hole 2 on the test block 1 can be processed into a cylindrical through hole similar to a bolt hole, and the diameter of the cylindrical through hole can be, for example, 20.5mm or 22.5mm. The cylindrical hole 2 is coaxial with the cylindrical test block 1 , that is, the hole 2 penetrates the test block 1 along the axial direction D1 of the cylinder (see FIG. 2 ).

Defect 4 is used to simulate the actual possible defects in the mounting hole of the workpiece. In the present embodiment, there are two defects 4 in the form of beveled grooves, the two defects 4 are symmetrically arranged with respect to the axial direction D1 of the hole 2 , and the two defects 4 are also arranged with respect to the radial direction passing through the center of the hole 2 D2 is also arranged symmetrically. That is, the two defects 4 are arranged symmetrically with respect to the center of the test block.

It can be understood that, in this embodiment, the symmetry plane between the two defects 4 is actually the plane taken by the B-B line in FIG. 1 (that is, the plane shown in FIG. 3 ), and the section taken along the A-A line (that is, FIG. 2 The plane shown) is perpendicular to the plane of symmetry of the two defects 4 . In the plane taken along the line A-A as shown in Fig. 2, the two defects 4 are in the shape of right triangles.

Preferably, the two defects 4 can be different from each other to simulate different defects that may occur on the mounting holes of the workpiece.

The test block 1 of this embodiment can be widely used in the eddy current test of the skin of the aircraft and the opening 2 of the connection joint. The detection process may specifically include the following steps:

1. The operator or operating equipment enters the aircraft and approaches the workpiece to be inspected;

2. Initialize and adjust the eddy current testing instrument;

3. Use the test block 1 to calibrate the eddy current testing instrument;

4. Use the calibrated eddy current testing instrument to test the workpiece;

5. Obtain the test results, in which if the amplitude of the eddy current testing instrument is greater than the amplitude when the eddy current testing instrument is applied to test the test block 1, it is determined that the workpiece has excessive defects;

6. Perform follow-up processing.

The inspection test block of the present invention has a hole 2 structure corresponding to the installation hole of the workpiece to be inspected, and the hole structure is provided with defects for simulating actual defects, so the inspection test block is relatively close to the structure of the workpiece to be inspected. The inspection equipment that completes the calibration of the test block can have better detection accuracy in actual detection.

The foregoing description of various embodiments of the present invention is provided for the purpose of description to one of ordinary skill in the relevant art. It is not intended that the invention be exclusive or limited to a single disclosed embodiment. As described above, various alternatives and modifications to the present invention will be apparent to those of ordinary skill in the art of the above teachings. Thus, while some alternative embodiments have been described in detail, other embodiments will be apparent to or relatively readily developed by those of ordinary skill in the art. This invention is intended to include all alternatives, modifications, and variations of the invention described herein, as well as other embodiments that fall within the spirit and scope of the invention described above.

List of parts reference numbers:

Test block 1

hole 2

The wall that defines the hole 3

Defect 4

Intersection between the wall defining the hole and the section taken by the A-A line 31

Axial direction D1

Radial direction D2.

Claims (11)

1. A detection test block (1) is used for calibrating a vortex detection instrument, the vortex detection instrument is used for detecting a workpiece to be detected with a mounting hole, and the detection test block is characterized in that the material of the detection test block is consistent with that of the workpiece to be detected, a hole (2) with the size consistent with that of the mounting hole of an object to be detected is arranged on the detection test block, the opening of the hole is located on the surface of the detection test block, the extending direction of the hole is perpendicular to the surface, a wall surface (3) limiting the hole is provided with a defect (4), and the defect is consistent with the form of the defect to be detected on the workpiece to be detected.

2. The test block of claim 1, wherein the size of the defect is the same as the size of the maximum allowable defect at the mounting hole of the workpiece to be inspected.

3. The test strip of claim 1, wherein the hole extends through the test strip.

4. The test strip according to claim 3, wherein the test strip is formed in a cylindrical structure, and the hole penetrates the test strip in an axial direction (D1) of the cylinder.

5. The test strip of claim 4,

the defects are arranged symmetrically with respect to the axial direction (D1) of the hole; and/or

The defects are symmetrically arranged with respect to a radial direction (D2) passing through the center of the hole.

6. The detection block according to claim 5, wherein the defects are two, two of the defects are symmetrical with respect to an axial direction of the hole, and in a cross section perpendicular to a plane of symmetry of the two defects, the shape of the defects is triangular.

7. The test strip of claim 6, wherein the triangle is a right triangle and the wall defining the hole is collinear with the intersection (31) of the cross-section and the right side of the right triangle.

8. The test strip of claim 4, wherein the hole has a diameter of 20.5mm or 22.5 mm.

9. The test strip of claim 1, wherein the holes are holes in the form of bolt holes.

10. The proof mass of claim 1, wherein the defect is in the form of a chamfer.

11. The test strip of claim 1, wherein the test strip is made of an aluminum alloy.

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