• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Inspection procedure of aluminum honeycomb structures by induced currents comprising: a) positioning a probe (2) to one spaced from the honeycomb structure (1) to be inspected less than 0.5mm and perpendicular to said structure (1); by means of a table (3) of coordinates XY, carrier of the probe (2), which includes an automatic leveling device; b) applying an alternating current to the probe (2) by means of a device (5) to generate a magnetic field that produces an induced current in the aluminum of the structure (1); c) moving the probe (2) over the entire structure (1), keeping it perpendicular to said structure (1) through the table (3), controlled by a computer (4), d) capturing the currents produced throughout of the surface of the structure (1) by the probe; and e) obtaining a graph of the currents captured by the probe by means of the equipment (5) to visualize it on a screen (6) in which the discontinuities present in the structure (1) are represented. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2678996A2
    申请号:ES201730083
    申请日:2017-01-24
    公开日:2018-08-21
    发明作者:Leticia BRAGADO ALONSO
    申请人:Tecnatom SA；
    IPC主号:
    专利说明:

    Inspection procedure of honeycomb aluminum structures by induced currents.

    DESCRIPTION
     5
    OBJECT OF THE INVENTION

    The following invention, as expressed in the statement of the present specification, refers to an inspection procedure for structures typical of the aerospace sector, with aluminum honeycomb, by induced currents. Its main objective is the inspection of flat and slightly curved surfaces of honeycomb structures in the detection of defects and take-offs between the skin and honeycomb.

    It is of vital importance that these structures are free from defects in their assembly in the part or component in question, avoiding great deterioration of the same in its commissioning, thus increasing its useful life.

    BACKGROUND OF THE INVENTION

    As is known, honeycomb structures are characterized by having between two 20 laminates (usually carbon fiber) a core that lightens their weight without reducing their capacities (strength, etc.). The core can be of very different materials (metallic, cardboard, etc.). As in the rest of composite structures, quality control in production of 100% of the pieces is required.
     25
    Until now the techniques or methods used in the inspection of honeycomb structures are Infrared Thermography (TIR) and ultrasound (UT), so that the conventional UT technique or method has the following limitations:

    - If a gel or water type coupling is used, the cells of the honeycomb can be flooded, which avoids the rapid degradation of the component, leading to its fracture;

    - If the UT-air technique is used, there is a great limitation in terms of
    detection of peels and / or defects near the edge. There is an effect called edge effect, whereby, as the probe approaches the geometric limits of the piece to be inspected, they are detected before the probe reaches the limit. In the case of UT, due to the dimensions of the probe, this effect occurs earlier than in the case of the 5 induced currents, since the sensors are of smaller dimensions and may be provided with a shield that confines the field lines, preventing them from going outside what are the geometric limits of the winding.
     10
    The final objective is to have an induced current inspection method for this type of structures that substitutes and / or is complementary to the UT technique.

    DESCRIPTION OF THE INVENTION
     fifteen
    This document describes an inspection procedure for aluminum honeycomb structures using induced currents, which
    It comprises the following stages:

    a) positioning a probe at a distance from the honeycomb structure to be inspected 20 smaller than 0.5mm and perpendicular to said honeycomb structure; by an XY coordinate table, probe holder, which includes an automatic leveling device,

    b) apply an alternating current to the probe by means of a device to generate a magnetic field that produces an induced current in the aluminum of the honeucomb structure,

    c) move the probe over the entire honeycomb structure, keep it in a perpendicular position to said honeycomb structure using the table, controlled by a computer,

    d) capture the currents produced along the surface of the honeycomb structure by means of the probe, and

    e) obtain a graph of the currents captured by the probe by means of the equipment to display it on a screen in which the discontinuities present in the honeycomb structure are represented.
     5
    It is very important that the probe is as close to the structure to be inspected but always without contacting it.

    In order to complement the description that is going to be carried out below, and in order to help a better understanding of the characteristics of the invention, the present descriptive report is accompanied by a set of drawings, whose figures are illustrative and not limiting, the most characteristic details of the invention are represented.

    BRIEF DESCRIPTION OF THE DESIGNS.
     fifteen
    Figure 1. Shows a view of the components necessary for the implementation of the procedure to inspect the honeycomb structure.

    Figure 2. Shows the results obtained in the inspection of a piece with honeycomb aluminum structure, being able to determine the detection of four discontinuities, 20 relative to two detachments and two drills.

    DESCRIPTION OF A PREFERRED EMBODIMENT.

    In view of the aforementioned figures and according to the numbering adopted we can observe how the inspection procedure of honeycomb structures of aluminum by induced currents, can be characterized in terms of detection and dimensioning in two dimensions (2D), the discontinuities present in the honeycomb aluminum structure.
     30
    When inspecting the structure, special care should be taken not to position the probe 2 fully in contact with it, being at a distance less than 0.5 mm as close as possible but without contacting it, it would be ideal for not cause external damage to honeycomb structure 1. In addition, probe 2 must be located as closely as possible.
    perpendicular possible with the surface to be inspected.

    The inspection shown in Figure 1 has been carried out with a 2-shielded pancake-type probe with ferrite core and provision for using an array with windings with this configuration, where the probe 2 mechanically moves through a table 3 5 of XY coordinates , which provides information of the coordinates to the equipment 5 of induced currents (for example, type ETbox) of data acquisition, so that said table 3 of coordinates XY is controlled by a movement computer 4, in order that the probe 2 Always be perpendicular to the structure to be inspected.
     10
    In order to corroborate that the results obtained are adequate, it is based on a honeycomb structure 1 in which four artificial discontinuities of different nature have been practiced, that is, two detached and two drills, and, thus, it has been possible to verify that by applying a alternating current with the equipment 5 of induced currents (ETbox) to the sensor of the probe 2, this, through the associated winding, generates a current in the honeycomb structure 1 to be inspected, which responds with another alternating current equal to that generated but in the opposite direction, which is stored in the equipment 5 of induced currents (ETbox), showing in a window 7 of the screen 6 the results obtained and shown in figure 2 of the designs.
     twenty
    In the graph of figure 2 relative to the results obtained, it can be seen how in the points "100" and "650" of the abscissa the detachments are shown and in the points "500" and "725" the holes are shown.

    The data of the induced currents captured by the sensor are read in a 25 TEDDY GEN software. Below is a C-scan window 7, on screen 6, with the results obtained.

    The use of a table 3 of XY coordinates of positioning of the probe 2 allows to obtain a very good resolution of the test and to locate the defects by means of coordinates, that is to say, it allows to position the defect in the inspected honeycomb structure 1 in the exact position.

    So, as seen above, the induced currents method used for the
    Honeycomb 1 metal structure detection offers significant advantages in terms of inspection resolution compared to UT air.

    In addition, this technique offers the possibility of inspecting the honeycomb structure at high speeds and the instrumentation costs are substantially lower compared to UT techniques.

    As a result of all this, it will allow:

    • It can be used up to the physical limit of the piece due to a lower edge effect with 10 conventional continuous currents.

    • The needs of the aeronautical sector could be met in metallic Honeycomb structures of certain characteristics: metallic core with not excessively thick skin (less than 10), detection of defect in the core with core thicknesses less than 15 10 mm (in 10 mm it would be inspected on both sides) thickness of the laminates, thickness and characteristics of the metal core, etc.

    • Get high resolution (up to cell size) compared to UT techniques
     twenty
    And this allows:

    • Reduce inspection costs since the cost of instrumentation is much lower in the case of current technology.
     25
    • Instrumentation and assembly of greater simplicity since it is not necessary to have access on both sides of the piece to be inspected, compared to UT techniques

    • Perform a cleaner inspection process, since no couplings are necessary, unlike the conventional UT technique. 30

    • Expand the capabilities of current techniques using induced currents as a rapid method of defect detection and combine with another test for later evaluation, if necessary.

    Regardless of what is indicated, it should be taken into account that:

    • It must be ensured that the probe is constantly positioned at 90º with respect to the piece and for this purpose an automatic positioning and leveling will be available that adapts the position of the probe to the curvature of the component.

    • Since the application of the induced currents technique does not allow to distinguish the position in depth of the defects, it would be necessary to retest with another technique in the areas where presence of defect is identified, in case it is required to know the depth to which the defect is found.

    • Following the study of the induced currents technique, a limited penetration capacity could be discovered that would require inspecting the structure on both sides. However, this is still a good alternative even if it was not economically as profitable as attacking the piece on one side, in addition to the already intrinsic advantage of the lack of contact, a necessity required for conventional UT.


     twenty
    权利要求:
    Claims (1)
    [1]
    R E I V I N D I C A C I O N E S
    1st.- INSPECTION PROCEDURE OF HONEYCOMB ALUMINUM STRUCTURES BY INDUCED CURRENTS, characterized in that it comprises the following stages:
    a) positioning a probe (2) at a distance from the honeycomb structure (1) to be inspected less than 0.5mm and perpendicular to said honeycomb structure (1); by means of an XY coordinate table (3), probe holder (2), which includes an automatic leveling device, 10
    b) apply an alternating current to the probe (2) by means of a device (5) to generate a magnetic field that produces an induced current in the aluminum of the honeycomb structure (1),
     fifteen
    c) move the probe (2) over the entire honeycomb structure (1), keeping it perpendicular to said honeycomb structure (1) by means of the table (3), controlled by a computer (4),
    d) capture the currents produced along the surface of the honeycomb structure by means of the probe, and
    e) obtain a graph of the currents captured by the probe by means of the device (5) to be displayed on a screen (6) in which the discontinuities present in the honeycomb structure (1) are represented. 25
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    同族专利:
    公开号 | 公开日
    ES2678996B1|2019-07-26|
    ES2678996R1|2018-10-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3172621A|1963-07-10|1965-03-09|Gen Electric|Airfoil|
    US4434659A|1982-02-19|1984-03-06|The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration|Two-dimensional scanner apparatus|
    EP0251648A3|1986-06-24|1989-05-24|British Aerospace Public Limited Company|Apparatus for locating the geometrical centre of a symmetrical bore|
    US20020128790A1|2001-03-09|2002-09-12|Donald Woodmansee|System and method of automated part evaluation including inspection, disposition recommendation and refurbishment process determination|
    US8179132B2|2009-02-18|2012-05-15|General Electric Company|Method and system for integrating eddy current inspection with a coordinate measuring device|
    US9435766B2|2013-12-05|2016-09-06|General Electric Company|System and method for inspection of components|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730083A|ES2678996B1|2017-01-24|2017-01-24|INSPECTION PROCEDURE OF HONEYCOMB ALUMINUM STRUCTURES BY INDUCED CURRENTS|ES201730083A| ES2678996B1|2017-01-24|2017-01-24|INSPECTION PROCEDURE OF HONEYCOMB ALUMINUM STRUCTURES BY INDUCED CURRENTS|
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