A mold preparation method for repairing an engine reverse thrust grid

Abstract

The application discloses a mold preparation method for repairing an engine reverse thrust grid, and relates to the technical field of airplane maintenance.The internal space of a reference cell is divided into a first region and a second region which do not interfere with each other, resin glue is poured only in the first region, the mold is prepared in a semi-cavity injection molding manner in the reference cell, the weight of the mold is reduced, the size of the mold is reduced, and subsequent operation and construction are facilitated; and the second region is left empty, the mold is ensured not to completely fill the reference cell, the prepared solidified mold can be taken out of the reference cell by using the space of the second region, and the mold is conveniently demolded.The mold prepared by the preparation method has an external contour which is adapted to a damaged cell lamination surface, and can provide a damaged cell lamination surface external contour reference for repairing the engine reverse thrust grid.

Description

Technical Field

[0001] This invention relates to the field of aircraft maintenance technology, and in particular to a method for preparing a mold for repairing engine thrust reverser grilles. Background Technology

[0002] The grille is a crucial component of the engine's thrust reverser, directing airflow at a specific angle to unload thrust and provide reverse thrust. Each grille contains multiple series of guide vanes; vanes within the same series have identical shapes and are generally laminated. The guide vanes in the grille interlock, forming multiple perforations. The inner circumferential wall surface of each perforation is the laminated profile of the perforation.

[0003] Because the forces exerted by the engine thrust reversers are enormous, the thrust airflow driven by the fan when the aircraft is on the ground can easily cause erosion damage to the thrust reverser grid from foreign objects. After prolonged use, the engine thrust reverser grid is prone to damage. Generally speaking, the most vulnerable areas of the thrust reverser grid are the laminated surfaces of the individual apertures.

[0004] Currently, the repair process described in existing manuals involves repairing the damaged laminated surface layer by layer based on the outer contour of the damaged aperture. However, because the guide vane has an arc-shaped structure in its width direction (i.e., the aperture depth direction), the curvature of each structural layer of the laminated surface is different. Moreover, existing manuals do not provide a method for obtaining the outer contour of the damaged aperture laminated surface, making the repair of the damaged laminated surface very difficult. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a mold for repairing engine thrust reverser grilles, so as to prepare a mold that is adapted to the outer contour of the laminated surface of the damaged grille, thereby solving the problem of the difficulty in repairing damaged laminated surfaces.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing a mold for repairing an engine thrust reverser grille includes the following steps:

[0008] Based on the laminated surface that needs to be repaired for the damaged aperture, select a guide vane with the same shape as the target guide vane, and select any undamaged aperture connected to the target guide vane as the reference aperture; within the reference aperture, take the inner end face where the target guide vane is located as the reference laminated surface;

[0009] The internal space of the reference lattice is divided into a first region and a second region that do not interfere with each other, and the first region covers the reference laminated surface.

[0010] The first region is partially enclosed, while the second region is left open, so that the reference aperture forms a cavity within the first region; the cavity covers the reference laminated surface, and the cavity has an opening that communicates with the outside.

[0011] Resin glue is poured into the cavity through the cavity opening. After the resin glue solidifies, the cured mold with an outer contour that matches the laminated surface to be repaired is removed.

[0012] In some embodiments, a reverse-push grid is erected, the reference hole grid is placed horizontally, and the reference laminate profile forms the bottom surface of the reference hole grid in the horizontally placed state; a first region covering the reference laminate profile is divided within the reference hole grid, starting from the reference laminate profile.

[0013] In some implementations, when the cross-sectional profile of the lattice is square, the diagonal of the square is used as the boundary line dividing the first region and the second region, so that the first region and the second region form a triangular prism-shaped space.

[0014] In some embodiments, a removable closure is provided in the reference grid so that the closure partially encloses the first region to form a chamber within the first region.

[0015] In some embodiments, closures are provided at the openings at opposite ends of the reference hole grid to partially close the openings at opposite ends of the reference hole grid, so that a cavity is formed in the first region between the closure and the inner wall of the reference hole grid.

[0016] In some implementations, an undamaged aperture adjacent to the damaged aperture and connected to the target guide vane is selected as a reference aperture.

[0017] In some embodiments, aluminum powder is mixed in when resin is injected into the cavity, and the aluminum powder is deposited on the end face where the reference laminate is located.

[0018] In some embodiments, the closure is a waterproof tape.

[0019] The method for preparing a mold for repairing an engine thrust reverser grille according to the present invention has the following advantages compared with the prior art:

[0020] (1) This preparation method reduces the weight and size of the mold by injecting resin glue only in the first area, so that the mold is prepared in the reference hole grid by half-cavity injection molding, which facilitates subsequent operation and construction.

[0021] (2) This preparation method utilizes the empty second region to ensure that the mold will not completely fill the reference hole grid, so that the prepared cured mold can use the space of the second region to remove the reference hole grid, making the mold demolding convenient.

[0022] (3) This preparation method can effectively improve the heat conduction efficiency of the mold by adding aluminum powder to the resin glue and allowing the aluminum powder to precipitate to the end face of the reference laminated surface, which facilitates subsequent operation and construction.

[0023] (4) The mold prepared by this method has an external contour that is adapted to the laminated surface of the damaged pore grid, which can provide a reference for the outer contour of the laminated surface of the damaged pore grid for the repair of the engine thrust grid. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the thrust bar in an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A magnified view of part A in the image;

[0026] Figure 3 This is a schematic diagram of the first region and the second region in an embodiment of the present invention.

[0027] In the figure, 1 is the thrust grid; 10 is the guide vane; 11 is the perforated grid; 110 is the laminated surface; 12 is the damaged perforated grid; 120 is the notch; 13 is the reference perforated grid; 130 is the first region; 131 is the second region; and 132 is the diagonal side. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] In the description of this invention, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In the description of this invention, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this invention to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] Example

[0033] like Figure 1 As shown, the existing thrust reverser grid 1 has multiple series of guide vanes 10, each of which is a laminated structure, meaning that each guide vane 10 has multiple layers arranged along its own length, and these multiple layers are stacked sequentially in the width direction of the guide vane 10. In the thrust reverser grid 1, the guide vanes 10 are staggered to form multiple perforations 11. The inner wall surface of each perforation 11 in the circumferential direction is the laminated profile 110 of the perforation 11.

[0034] Since the vulnerable areas of the thrust grid 1 are the walls of each aperture 11, when the thrust grid 1 is damaged, such as Figure 2 As shown, the pore wall of the damaged pore grid 12 is broken, forming a gap 120. Based on the laminated structure of the guide vane 10, the gap 120 needs to be repaired layer by layer.

[0035] Based on the aforementioned situation of the thrust reverser grille 1, this embodiment of the invention provides a method for preparing a mold for repairing the engine thrust reverser grille 1, comprising the following steps:

[0036] S1. Based on the laminated surface 110 that needs to be repaired in the damaged aperture 12, select the guide vane 10 with the same shape as the target guide vane, and select any undamaged aperture connected to the target guide vane as the reference aperture 13; within the reference aperture 13, take the inner end face where the target guide vane is located as the reference laminated surface.

[0037] It should be noted that guide vanes 10 with the same shape refer to guide vanes 10 belonging to the same series. These guide vanes 10 have the same curvature structure in their width direction, such as... Figure 1The guide vanes 10 arranged laterally shown all have an arc surface with a concave surface facing the inside of the aperture 11, and the arc surface of each guide vane 10 arranged laterally has the same curvature.

[0038] Generally, the guide vane 10 where the damaged lamination surface 110 needs to be repaired can be selected as the target guide vane based on the location of the damaged lamination surface 110. With the target guide vane as the connecting guide, the undamaged holes adjacent to the damaged holes 12 are the reference holes 13 that meet the mold preparation requirements, and they have the same curvature of the lamination surface 110.

[0039] S2. Starting from the reference laminated surface, the internal space of the reference grid 13 is divided into a first region 130 covering the reference laminated surface and a second region 131 that does not interfere with the first region 130. By dividing the internal space of the reference grid 13 into the first region 130 and the second region 131 that do not interfere with each other, the volume of subsequent resin injection can be limited to facilitate subsequent operations.

[0040] like Figure 1 As shown, the cross-sectional profile of the holes 11 of the existing reverse-thrust grid 1 is mostly square. In this case, the diagonal of the square can be used as the boundary line to divide the first region 130 and the second region 131, so that the first region 130 and the second region 131 form a triangular prism-shaped space, which can quickly divide the first region 130 and the second region 131. Furthermore, using the diagonal of the square as the boundary line to divide the first region 130 and the second region 131 can ensure that the first region 130 and the second region 131 do not interfere with each other.

[0041] S3. The first region 130 is semi-enclosed, and the second region 131 is left empty, so that the reference grid 13 forms a cavity in the first region 130; the cavity covers the reference laminated surface, and the cavity has an opening that communicates with the outside.

[0042] It should be noted that the semi-enclosed first region 130 refers to leaving one end of the first region 130 open, allowing it to communicate with the outside, while the other ends are closed, thereby enabling the reference lattice 13 to form a chamber within the first region 130. Taking a triangular prism-shaped space as an example, the first region 130 can be semi-enclosed by closing the front and rear sides of the first region 130 and leaving the diagonal side 132 of the first region 130 open, or by closing the diagonal side 132 and the rear side of the first region 130 and leaving the front side of the first region 130 open.

[0043] In performing this preparation method, a removable closure can be provided in the reference aperture 13 to partially enclose the first region 130, thereby forming a cavity within the first region 130. Specifically, closures can be provided at the openings at opposite ends of the reference aperture 13 to partially enclose the openings at opposite ends of the reference aperture 13, leaving the diagonal side 132 of the reference aperture 13 empty, thereby forming a cavity within the first region 130 between the closure and the inner wall of the reference aperture 13.

[0044] Thanks to the removable nature of the closure, maintenance personnel can remove it after the mold is prepared, avoiding any impact on subsequent repairs of the thrust bar 1. Considering the ease of installation and removal of the closure, waterproof tape can be used.

[0045] S4. Pour resin into the cavity through the cavity opening. After the resin has solidified, remove the cured mold whose outer contour matches the laminated surface 110 to be repaired.

[0046] It should be noted that since the chamber is formed only within the first region 130, the resin will only fill the space of the first region 130 of the reference grid 13 and will not spread into the second region 131. As a result, the cured mold will not fill the entire space of the reference grid 13, leaving a gap between the cured mold and the reference grid 13, allowing the cured mold to detach from the reference grid 13 relatively easily.

[0047] To facilitate resin injection, before injecting the resin, the reference hole grid 13 can be placed horizontally by using a vertically upright reverse grid 1, with the reference laminated surface forming the bottom surface of the reference hole grid 11 in the horizontal position. With this arrangement, after the sealing member closes the openings at both ends of the reference hole grid 13, maintenance personnel can inject the resin from the diagonal side 132 of the reference hole grid 13. Furthermore, since the reference laminated surface forms the bottom surface of the reference hole grid 11 in the horizontal position, the resin can first cover the entire area of ​​the reference laminated surface, thereby reducing the amount of resin required to prepare the curing mold. Moreover, by vertically uprighting the reverse grid 1, the sealing member can more easily close the first area 130 of the reference hole grid 13.

[0048] The damaged guide vane 10's perforated walls need to be ground in steps from shallow to deep to facilitate lamination and repair. However, during the curing process of the laminated structure, heat can only be conducted from the outside to the inside, generating a large temperature gradient in the repair area, which adversely affects curing efficiency and molding effect. To address this, when injecting resin into the cavity, in order to improve the thermal conductivity of the prepared cured mold, aluminum powder can be mixed into the resin and allowed to settle to the end face where the reference lamination surface is located.

[0049] In summary, this invention provides a method for preparing a mold for repairing an engine thrust reverser grille 1. By injecting resin only into the first region 130, the mold is prepared using a semi-cavity injection molding method within the reference aperture 13, reducing mold weight and size, and facilitating subsequent operations. Furthermore, this method utilizes a left-open second region 131 to ensure the mold does not completely fill the reference aperture 13, allowing the cured mold to be easily removed from the reference aperture 13 using the space in the second region 131. In addition, this method improves the mold's heat transfer efficiency by adding aluminum powder to the resin and allowing the powder to settle to the end face of the reference lamination surface, further facilitating subsequent operations. The mold prepared by this method has an external contour adapted to the lamination surface 110 of the damaged aperture 12, providing a reference for the external contour of the lamination surface 110 of the damaged aperture 12 for engine thrust reverser grille 1 repair.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a mold for repairing an engine thrust reverser grille, characterized in that, Includes the following steps: Based on the laminated surface that needs to be repaired for the damaged aperture, a guide vane with the same shape is selected as the target guide vane, and an undamaged aperture adjacent to the damaged aperture and connected to the target guide vane is selected as the reference aperture; within the reference aperture, the inner end face where the target guide vane is located is used as the reference laminated surface. The internal space of the reference lattice is divided into a first region and a second region that do not interfere with each other, and the first region covers the reference laminated surface. A removable closure is provided in the reference aperture grid, so that the closure partially closes the first area and leaves the second area empty, so that the reference aperture grid forms a chamber in the first area; The chamber covers the reference laminated surface and has an opening communicating with the outside; wherein, the sealing member is provided at the openings at opposite ends of the reference hole grid to partially close the openings at opposite ends of the reference hole grid, so that the chamber is formed between the sealing member and the inner wall of the reference hole grid in the first region. Resin glue is injected into the cavity through the cavity opening. After the resin glue solidifies, a cured mold with an outer contour that matches the laminated surface to be repaired is removed. When injecting the resin glue into the cavity, aluminum powder is mixed in and the aluminum powder is allowed to settle to the end face where the reference laminated surface is located.

2. The method for preparing a mold for repairing an engine thrust reverser grille according to claim 1, characterized in that, The reverse grid is erected so that the reference hole is placed horizontally and the reference laminated surface forms the bottom surface of the reference hole in the horizontal state; starting from the reference laminated surface, a first region covering the reference laminated surface is divided within the reference hole.

3. The method for preparing a mold for repairing an engine thrust reverser grille according to claim 1 or 2, characterized in that, When the cross-sectional profile of the reference lattice is square, the diagonal of the square is used as the boundary line dividing the first region and the second region, so that the first region and the second region form a triangular prism-shaped space.

4. The method for preparing a mold for repairing an engine thrust reverser grille according to claim 1, characterized in that, The sealing component is waterproof tape.

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