Curing pressure applying device and method for composite material bonding repair metal

Abstract

The invention discloses a curing pressure applying device and method for composite material glue joint repair metal, and belongs to the field of metal structure maintenance, the device comprises a magnetic pressurization component used for applying curing pressure to a repair area and comprising a square pressurization magnet unit, and the center of the top end face of the square pressurization magnet unit is provided with a dismounting ring; a connecting plate is arranged on the peripheral edge of the top end face of the square pressurizing magnet unit, and a fastener matched with the connecting plate is arranged on one side of the connecting plate; the flexible pressure transmitting component is arranged on one side of the magnetic pressurizing component, is used for transmitting applied pressure and comprises a flexible pressure transmitting bag located on one side of the magnetic pressurizing component, a pressure transmitting medium is arranged in the flexible pressure transmitting bag, a hydraulic pressure gauge is arranged on one side of the flexible pressure transmitting bag, and an instrument guide pipe is connected between the hydraulic pressure gauge and the flexible pressure transmitting bag. According to the device, uniform pressurization can be carried out, and the quality of a composite material bonding repair aluminum alloy structure is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal structure repair, in particular to a curing pressure applying device and method for composite material bonding repair of metal. BACKGROUND

[0002] Aluminum alloy structures are widely used in the fields of aircraft, automobiles and the like due to their light weight, high strength, easy processing and the like. Under the action of service time and service load, aluminum alloy structures are prone to fatigue cracks or stress corrosion cracks. Composite material bonding repair technology is an important method for repairing aluminum alloy structures at present. However, due to the limitations of structural features such as T-shaped and C-shaped structures and the influence of the operation space, it is impossible to use a vacuum bag to pressurize the repair area, resulting in low repair quality.

[0003] The existing Chinese patent CN202221470960.0 (published on November 04, 2022) discloses a mechanical pressurization and removal tool for composite material bonding repair. However, this method requires the design of a special tool according to the specific structural features, and it is difficult to solve the pressurization problem of different damage areas and different damage degrees. The Chinese patent CN202211679958.9 (published on April 25, 2023) discloses a composite material product repair pressurization device. This method is pressurized by a mechanical structure and is mainly applied to the repair of composite material products, which is difficult to be applied to in-situ bonding repair of metal structures. Therefore, there is an urgent need to propose a new in-situ pressurization method for composite material bonding repair of aluminum alloy structures to solve the problems of inability to pressurize and uneven pressurization.

[0004] Therefore, the present application provides a curing pressure applying device and method for composite material bonding repair of metal to solve the problems raised in the background. SUMMARY

[0005] The present application aims to provide a curing pressure applying device and method for composite material bonding repair of metal, which can be uniformly pressurized and effectively improve the quality of composite material bonding repair of aluminum alloy structures to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0007] A curing pressure applying device and method for composite material bonding repair of metal, comprising:

[0008] A magnetic pressurization component for applying curing pressure to the repair area, comprising a square pressurization magnet unit, a dismounting ring is arranged at the center of the top surface of the square pressurization magnet unit, and a connecting plate is arranged at the position of the four peripheral edges of the top surface of the square pressurization magnet unit, one side of the connecting plate is provided with a fastener matched with the connecting plate;

[0009] The flexible pressure transmission component is arranged on one side of the magnetic pressure component and is used for transmitting the applied pressure.

[0010] As a further scheme of the present application, the flexible pressure transmission component specifically comprises a flexible pressure transmission bag arranged on one side of the magnetic pressure component, the inside of the flexible pressure transmission bag is provided with a pressure transmission medium, one side of the flexible pressure transmission bag is provided with a hydraulic pressure gauge, the hydraulic pressure gauge and the flexible pressure transmission bag are connected through an instrument conduit, one side of the instrument conduit is provided with a valve, and the valve and the flexible pressure transmission bag are connected through a valve conduit.

[0011] As a further scheme of the present application, the square-shaped pressure magnet unit adopts a neodymium-iron-boron magnet with a Curie temperature of 320-460°C.

[0012] As a further scheme of the present application, the flexible pressure transmission bag adopts a flexible rubber bag, and the maximum pressure bearing of the flexible rubber bag is 0.2 MPa.

[0013] As a further scheme of the present application, the pressure transmission medium adopts an oil body with a boiling point of 200°C or above.

[0014] The present application also discloses a curing pressure application method for composite material adhesive repair metal, which adopts a curing pressure application device for composite material adhesive repair metal and comprises the following steps.

[0015] Step 1, selecting a proper number of magnetic pressure components according to the size of the repair area;

[0016] Step 2, assembling and fixing the plurality of magnetic pressure components through the connecting plates and fasteners on the square-shaped pressure magnet unit to form a magnetic pressure block;

[0017] Step 3, installing the valve conduit and the instrument conduit on the flexible pressure transmission bag;

[0018] Step 4, installing the hydraulic pressure gauge on the instrument conduit;

[0019] Step 5, filling the pressure transmission medium into the flexible pressure transmission bag through the valve conduit, and making the pressure transmission medium fill the flexible pressure transmission bag;

[0020] Step 6, installing the valve on the valve conduit and keeping the valve closed;

[0021] Step 7, after the surface treatment of the composite material patch and the aluminum alloy structure, evenly applying the adhesive on the surface of the composite material patch;

[0022] Step 8, placing the composite material patch coated with the adhesive on the repair area of the aluminum alloy structure, and placing the release cloth, the release film and the electric heating blanket on the composite material patch in sequence;

[0023] Step 9, place the flexible pressure transmission bag filled with pressure transmission medium on the composite patch;

[0024] Step 10, place the assembled magnetic pressure block on the flexible pressure transmission bag, and place a magnetic pressure block or a steel plate on the other side of the aluminum alloy structure;

[0025] Step 11, open the valve to slowly release the pressure transmission medium in the flexible pressure transmission bag, and observe the hydraulic pressure, when the pressure reaches 0.1-0.15 MPa, close the valve;

[0026] Step 12, turn on the electric blanket to heat the repair area and complete the curing of the adhesive;

[0027] Step 13, when the adhesive curing is completed, remove the magnetic pressure block through the dismounting ring on the square pressure magnet unit, and open the fastener and connecting plate to complete the disassembly of the magnetic pressure block;

[0028] Step 14, remove the flexible pressure transmission bag, open the valve, and release the pressure transmission medium in the flexible pressure transmission bag, and remove the hydraulic pressure gauge, instrument conduit, valve, and valve conduit from the flexible pressure transmission bag;

[0029] Step 15, sequentially remove the electric blanket, isolation film, and release cloth from the composite patch, polish the adhesive area, and complete the composite adhesive repair of the aluminum alloy.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] 1. The present application realizes the pressure of aluminum alloy structures of different sizes and different formations by assembling the square pressure magnet unit, which is simple and effective.

[0032] 2. The present application utilizes the isotropic characteristics of liquid pressure transmission to realize the consistency of pressure on each area of the patch, and eliminates the problem of pressure stress concentration caused by the gap between the pressure device and the patch.

[0033] 3. The present application is simple and convenient to operate, easy to carry and transport, and can be used for in-field structure repair and repair work under field conditions. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure diagram of a magnetic pressure component in a curing pressure application device for composite adhesive repair of metal;

[0035] Figure 2 It is a structure diagram of a flexible pressure transmission component in a curing pressure application device for composite adhesive repair of metal;

[0036] Figure 3A schematic view of the structure of a magnetic pressing block assembled in a curing pressure applying device for composite material adhesive repair of metal;

[0037] Figure 4 A schematic view of the structure of a curing pressure applying device used in Embodiment 1 of the present application.

[0038] In the figure: 1, magnetic pressing component; 2, flexible pressure transmission component; 3, square pressing magnet unit; 4, dismounting ring; 5, connecting plate; 6, fastener; 7, flexible pressure transmission bag; 8, pressure transmission medium; 9, instrument conduit; 10, hydraulic gauge; 11, valve conduit; 12, valve; 13, magnetic pressing block; 14, T-shaped aluminum alloy structure; 15, composite material patch; 16, adhesive; 17, release cloth; 18, release film; 19, electric heating blanket. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] As mentioned in the background of the present application, it has been found through research that the existing pressure applying method is affected by the repair operation space limitation and the variety of composite material corner box sizes, and it is difficult to apply the curing pressure of the adhesive 16 during the composite material adhesive repair, which leads to reduced repair quality and certain defects.

[0041] In order to solve the above-mentioned defects, the present application discloses a curing pressure applying device and method for composite material adhesive repair of metal, which can apply uniform pressure and effectively improve the quality of composite material adhesive repair of aluminum alloy structures.

[0042] The solutions of the present application to the above-mentioned technical problems will be described in detail below in combination with the accompanying drawings.

[0043] Please refer to Figures 1 to 3 In the embodiments of the present application, a curing pressure applying device for composite material adhesive repair of metal comprises: a magnetic pressing component 1 for applying curing pressure to a repair area, which comprises a square pressing magnet unit 3, a dismounting ring 4 is arranged at the center of the top surface of the square pressing magnet unit 3, and a connecting plate 5 is arranged at the position of the periphery of the top surface of the square pressing magnet unit 3, one side of the connecting plate 5 is provided with a fastener 6 matched with the connecting plate 5; a flexible pressure transmission component 2 arranged on one side of the magnetic pressing component 1 for transmitting the applied pressure. The square pressing magnet unit 3 is assembled in the present application, which realizes the pressing of aluminum alloy structures of different sizes and different formations, and the method is simple and effective.

[0044] In the embodiment, the flexible pressure transmission component 2 specifically comprises: a flexible pressure transmission bag 7 located at one side of the magnetic pressure component 1, the inside of the flexible pressure transmission bag 7 is provided with a pressure transmission medium 8, one side of the flexible pressure transmission bag 7 is provided with a hydraulic gauge 10, the hydraulic gauge 10 is connected with the flexible pressure transmission bag 7 through an instrument conduit 9, one side of the instrument conduit 9 is provided with a valve 12, the valve 12 is connected with the flexible pressure transmission bag 7 through a valve conduit 11. The present application utilizes the isotropic characteristics of liquid pressure transmission to realize the consistency of pressure in each area of the composite patch 15, and eliminates the problem of pressure stress concentration caused by the gap between the pressure device and the composite patch 15.

[0045] In the embodiment, the square pressure magnet unit 3 adopts a neodymium iron boron magnet with a Curie temperature of 320-460℃, which can meet the demand of adhesive 16 heating and curing.

[0046] In the embodiment, the flexible pressure transmission bag 7 adopts a flexible rubber bag, and the maximum pressure bearing of the flexible rubber bag is 0.2MPa, so as to meet the demand of adhesive 16 pressure, and the gap between the flexible pressure transmission bag 7 and the composite patch 15 can be filled.

[0047] In the embodiment, the pressure transmission medium 8 adopts an oil body with a boiling point of more than 200℃, so as to meet the heating demand of commonly used adhesives 16 such as J-349-1 and J-352 with a curing temperature in the range of 80-150℃.

[0048] The application also discloses a curing pressure application method of composite material adhesive repair metal, and adopts the curing pressure application device of composite material adhesive repair metal, and comprises the following steps: step 1, a proper number of magnetic pressure components 1 are selected according to the size of the repair area; step 2, the magnetic pressure components 1 are assembled and fixed through the connecting plate 5 and the fastener 6 on the square pressure magnet unit 3 to form a magnetic pressure block 13; step 3, the valve conduit 11 and the instrument conduit 9 are installed on the flexible pressure transmission bag 7; step 4, the hydraulic gauge 10 is installed on the instrument conduit 9; step 5, the pressure transmission medium 8 is filled into the flexible pressure transmission bag 7 through the valve conduit 11, and the pressure transmission medium 8 fills the flexible pressure transmission bag 7; step 6, the valve 12 is installed on the valve conduit 11, and the valve 12 is kept closed; step 7, after the composite material patch 15 and the aluminum alloy structure are surface treated, the adhesive 16 is evenly applied on the surface of the composite material patch 15; step 8, the composite material patch 15 coated with the adhesive 16 is placed on the repair area of the aluminum alloy structure, and the release cloth 17, the isolation film 18 and the electric heating blanket 19 are sequentially placed on the composite material patch 15; step 9, the flexible pressure transmission bag 7 filled with the pressure transmission medium 8 is placed on the composite material patch 15; step 10, the assembled magnetic pressure block 13 is placed on the flexible pressure transmission bag 7, and another magnetic pressure block 13 or a steel plate is placed on the other side of the aluminum alloy structure; step 11, the valve 12 is opened to slowly flow out the pressure transmission medium 8 in the flexible pressure transmission bag 7, and the number shown by the hydraulic gauge 10 is observed, when the pressure reaches 0.1-0.15 MPa, the valve 12 is closed; step 12, the electric heating blanket 19 is opened to heat the repair area, and the curing of the adhesive 16 is completed; step 13, when the curing of the adhesive 16 is completed, the magnetic pressure block 13 is taken off through the dismounting ring 4 on the square pressure magnet unit 3, and the fastener 6 and the connecting plate 5 are opened, and the decomposition of the magnetic pressure block 13 is completed; step 14, the flexible pressure transmission bag 7 is taken off, the valve 12 is opened, the pressure transmission medium 8 in the flexible pressure transmission bag 7 is discharged, and the hydraulic gauge 10, the instrument conduit 9, the valve 12 and the valve conduit 11 are detached from the flexible pressure transmission bag 7; step 15, the electric heating blanket 19, the isolation film 18 and the release cloth 17 are sequentially taken off from the composite material patch 15, and the adhesive area is polished, and the composite material adhesive repair aluminum alloy is completed. The application is simple and convenient to operate, is convenient to carry and transport, and can be used for in-field structure repair and repair work under external field conditions.

[0049] In order to further illustrate the application, the curing pressure application device and method of composite material adhesive repair metal provided by the application are described in detail in combination with the following examples.

[0050] Example 1: taking the pressure process of composite material adhesive repair T-shaped aluminum alloy structure 14 as an example, as shown in the figure, Figure 3 and Figure 4The use of the pressing device is illustrated by the following steps, including the following steps:

[0051] Step 1, select a proper number of magnetic pressing components 1 according to the size of the repair area of the T-shaped aluminum alloy structure 14, in the example, 40 magnetic pressing components 1 are selected;

[0052] Step 2, assemble and fix the plurality of magnetic pressing components 1 through the connecting plate 5 and the fastener 6 on the square magnetic pressing unit 3 to form a magnetic pressing block 13, in the example, four magnetic pressing blocks 13 are assembled;

[0053] Step 3, install the valve conduit 11 and the instrument conduit 9 on the flexible pressure transmission bag 7;

[0054] Step 4, install the hydraulic gauge 10 on the instrument conduit 9;

[0055] Step 5, fill the pressure transmission medium 8 into the flexible pressure transmission bag 7 through the valve conduit 11, and make the pressure transmission medium 8 fill the flexible pressure transmission bag 7 to form a flexible pressure transmission component 2;

[0056] Step 6, install the valve 12 on the valve conduit 11, and keep the valve 12 closed;

[0057] Step 7, after the surface treatment of the composite patch 15 and the T-shaped aluminum alloy structure 14, evenly apply the adhesive 16 on the surface of the composite patch 15;

[0058] Step 8, place the composite patch 15 coated with the adhesive 16 on the repair area of the T-shaped aluminum alloy structure 14, and place the release cloth 17, the release film 18, and the electric heating blanket 19 on the composite patch 15 in sequence;

[0059] Step 9, place the flexible pressure transmission bag 7 filled with the pressure transmission medium 8 on the composite patch 15;

[0060] Step 10, place the assembled magnetic pressing block 13 on the flexible pressure transmission component 2, and place another magnetic pressing block 13 on the other side of the aluminum alloy;

[0061] Step 11, open the valve 12 to slowly flow out the pressure transmission medium 8 in the flexible pressure transmission bag 7, and observe the reading of the hydraulic gauge 10, when the pressure reaches between 0.1-0.15 MPa, close the valve 12;

[0062] Step 12, power on the electric heating blanket 19 to heat the repair area, and complete the curing of the adhesive 16;

[0063] Step 13, when the adhesive 16 is completely cured, remove the magnetic pressing block 13 through the dismounting ring 4 on the square magnetic pressing unit 3, and open the fastener 6 and the connecting plate 5 to complete the disassembly of the magnetic pressing block 13;

[0064] Step 14, remove the flexible pressure transmission component 2, open the valve 12, release the pressure transmission medium 8 in the flexible pressure bag 7, and remove the hydraulic gauge 10, instrument conduit 9, valve 12, valve conduit 11 from the flexible pressure bag 7;

[0065] Step 15, sequentially remove the electric blanket 19, isolation film 18, release cloth 17 from the composite patch 15, polish the glue joint area, that is, complete the composite glue joint repair of aluminum alloy.

[0066] The square pressure magnet unit 3 is assembled to realize the pressure of aluminum alloy structures of different sizes and different formations, and the method is simple and effective. In addition, the application utilizes the isotropic characteristics of liquid pressure transmission to realize the consistency of pressure in each area of the patch, and eliminates the problem of pressure stress concentration caused by the gap between the pressure device and the patch. Moreover, the operation of the application is simple and convenient, and it is easy to carry and transport, and can be used for in-field structure repair and repair work under field conditions.

[0067] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

[0068] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent substitutions or changes according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A curing pressure application device for bonding and repairing metal with composite materials, characterized in that, include: A magnetic pressure component (1) is used to apply curing pressure to the repair area. It includes a square pressure magnet unit (3), a disassembly ring (4) is provided at the center of the top surface of the square pressure magnet unit (3), and a connecting plate (5) is provided at the four periphery of the top surface of the square pressure magnet unit (3). A fastener (6) matching the connecting plate (5) is provided on one side of the connecting plate (5). The flexible pressure transmission component (2) is located on one side of the magnetic pressure application component (1) and is used to transmit the applied pressure.

2. The curing pressure application device for bonding and repairing metal with composite materials according to claim 1, characterized in that, The flexible pressure transmission component (2) specifically includes: a flexible pressure transmission bag (7) located on one side of the magnetic pressure unit (1), the interior of the flexible pressure transmission bag (7) is provided with a pressure transmission medium (8), and a hydraulic gauge (10) is provided on one side of the flexible pressure transmission bag (7). An instrument conduit (9) is connected between the hydraulic gauge (10) and the flexible pressure transmission bag (7), and a valve (12) is provided on one side of the instrument conduit (9). A valve conduit (11) is connected between the valve (12) and the flexible pressure transmission bag (7).

3. The curing pressure application device for bonding and repairing metal with composite materials according to claim 2, characterized in that, The square pressure magnet unit (3) uses neodymium iron boron magnets with a Curie temperature of 320℃-460℃.

4. The curing pressure application device for bonding and repairing metal with composite materials according to claim 3, characterized in that, The flexible pressure-transmitting bag (7) is made of flexible rubber and the maximum pressure bearing capacity of the flexible rubber bag is 0.2 MPa.

5. The curing pressure application device for bonding and repairing metal with composite materials according to claim 4, characterized in that, The pressure transmission medium (8) is an oil with a boiling point of 200°C or higher.

6. A method for applying curing pressure to repair metal by bonding composite materials, characterized in that, The curing pressure application device for bonding and repairing metal with composite materials as described in any one of claims 1-5 includes the following steps: Step 1: Select an appropriate number of magnetic pressure components (1) according to the size of the repair area; Step 2: Assemble and fix multiple magnetic pressure components (1) using the connecting plate (5) and fasteners (6) on the square pressure magnet unit (3) to form a magnetic pressure block (13); Step 3: Install the valve conduit (11) and instrument conduit (9) onto the flexible pressure transmission bag (7); Step 4: Install the hydraulic gauge (10) onto the instrument conduit (9); Step 5: Add the pressure transmitting medium (8) into the flexible pressure transmitting bag (7) through the valve conduit (11) and fill the flexible pressure transmitting bag (7) with the pressure transmitting medium (8); Step 6: Install valve (12) onto valve guide (11) and keep valve (12) closed; Step 7: After surface treatment of the external composite material patch (15) and aluminum alloy structure, apply adhesive (16) evenly to the surface of the composite material patch (15); Step 8: Place the composite material patch (15) coated with adhesive (16) on the aluminum alloy structure repair area, and place the release cloth (17), release film (18), and electric blanket (19) on the composite material patch (15) in sequence; Step 9: Place the flexible pressure-transmitting bag (7) filled with pressure-transmitting medium (8) onto the composite material patch (15); Step 10: Place the assembled magnetic pressure block (13) on the flexible pressure transmission bag (7), and place a magnetic pressure block (13) or steel plate on the other side of the aluminum alloy structure; Step 11: Open valve (12) to slowly let the pressure transmission medium (8) in the flexible pressure transmission bag (7) flow out, and observe the reading of the hydraulic gauge (10). When the pressure reaches between 0.1-0.15MPa, close valve (12). Step 12: Turn on the electric blanket (19) to heat the repair area and complete the curing of the adhesive (16); Step 13: After the adhesive (16) has cured, remove the magnetic pressure block (13) by using the disassembly ring (4) on the square pressure magnet unit (3), and open the fastener (6) and connecting plate (5) to complete the disassembly of the magnetic pressure block (13); Step 14: Remove the flexible pressure transmission bag (7), open the valve (12), release the pressure transmission medium (8) in the flexible pressure transmission bag (7), and remove the hydraulic gauge (10), instrument conduit (9), valve (12), and valve conduit (11) from the flexible pressure transmission bag (7). Step 15: Remove the electric heating blanket (19), the release film (18), and the release cloth (17) from the composite material patch (15) in sequence, and grind the adhesive area to complete the composite material adhesive repair of aluminum alloy.

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