A precision tooling for repairing the sawtooth structure of an aircraft wing surface

Abstract

This invention relates to a precision tooling for repairing serrated structures on aircraft wing surfaces, comprising a fixing frame and a pressing mechanism. The pressing mechanism includes a fixing beam, a serrated template, and multiple screw adjustment mechanisms. Multiple threaded holes are formed along the fixing beam, each threaded hole engaging with a screw adjustment mechanism. The two ends of the fixing beam can be fixed integrally with the frame via fasteners that engage with mounting holes in the frame. The serrated template is used to adhere to the serrated area of ​​the skin surface to be repaired, assisting in the precision repair process. Rotating the screw adjustment mechanism allows it to press the serrated template firmly onto the surface of the skin surface to be repaired. This invention improves processing accuracy: by using the central serration as a reference, it overcomes the deformation caused by composite material bonding; the template-pressor fit design avoids deformation caused by the template, resulting in high processing consistency. It ensures the serrated structure meets design specifications, improving stealth performance.

Description

Technical Field

[0001] This invention relates to the field of aerospace manufacturing technology, specifically to a precision tooling for modifying the sawtooth structure of an aircraft wing surface to improve the aircraft's stealth performance. Background Technology

[0002] In modern aircraft design, to enhance stealth performance, the seams of wing surface skin are typically designed in a serrated pattern, with strict tolerances for the seam gaps to reduce radar cross-section. However, wing structures are usually manufactured using composite material bonding, which is prone to warping during the bonding process. Conventional processes and tools cannot produce serrated structures that meet the required tolerances. Currently, the main methods for manufacturing serrated structures include:

[0003] Direct machining: Machining before demolding results in the saw teeth being deformed as the airfoil structure warps during demolding, ultimately failing to meet the precision requirements; machining after demolding results in the airfoil structure already deformed, and the mold lacks an accurate positioning reference, so the saw teeth structure also fails to meet the precision requirements.

[0004] Using templates: Traditional templates are flexible. When operators use templates to fit the wing structure, problems such as template deformation, gaps between the template and the wing structure, and inaccurate positioning can lead to inaccurate machining of the serrated structure.

[0005] The current approach involves using a flexible template for scribing, followed by manual machining of the serrated structure using pneumatic tools (such as milling cutters). However, due to the flexibility of the template itself (rigid templates cannot fit the wing surface due to deformation), bending or twisting may occur during the pressing and bonding process, thus transmitting errors to the machined serrated structure and causing the gap between the serrations to fail to meet the required specifications. Summary of the Invention

[0006] The purpose of this invention

[0007] The purpose of this invention is to provide a precision tooling for modifying the sawtooth structure of aircraft wings. This tooling uses the pre-machined sawtooth in the central area as a reference, and employs locating pins and clamping devices to ensure a stable fit of the template, thereby precisely machining the entire sawtooth structure. This tooling overcomes the effects of composite material deformation and template flexibility, achieving efficient and high-precision machining.

[0008] The technical solution adopted in this invention is as follows:

[0009] A precision shaping fixture for the sawtooth structure of an aircraft wing surface is provided, including a fixing frame 1 and a pressing mechanism 2;

[0010] The fixing frame is a frame, and the middle area of ​​the frame is used to position the skin workpiece to be repaired. The frame is provided with a clamping assembly 3, which can fix the skin workpiece to be repaired relative to the frame.

[0011] Multiple mounting holes are provided along the frame;

[0012] The pressing mechanism includes a fixed beam 21, a serrated template 22, and multiple screw adjustment mechanisms 23; multiple threaded holes are opened along the fixed beam, and each threaded hole is matched with a screw adjustment mechanism.

[0013] The two ends of the fixed beam can be fixed to the frame as one unit by fasteners engaging with the mounting holes of the frame;

[0014] The serrated template is used to attach to the serrated area on the surface of the skin workpiece 4 to be repaired, to assist in the fine repair process.

[0015] Rotating the screw adjustment mechanism allows it to press the serrated template firmly onto the surface of the skin workpiece to be repaired.

[0016] Furthermore, the multiple screw adjustment mechanisms are evenly distributed with a spacing of 100–400 mm.

[0017] Furthermore, the thickness of the serrated template is 2–10 mm.

[0018] Furthermore, the serrated template can be made of aluminum, steel, or plastic.

[0019] Furthermore, the serrated template is a non-uniform serrated template.

[0020] Furthermore, the serrated template is a uniformly serrated template.

[0021] Furthermore, a clamping block 25 is also provided at the front end of the screw adjustment mechanism.

[0022] Furthermore, the serrated template has positioning holes 221. These are used to match the skin mounting holes on the surface of the workpiece to be repaired, achieving precise positioning.

[0023] Furthermore, it also includes a guide block 24, which is provided with a protruding guide pin. The fixed beam has a through hole, which serves as a guide hole and is adapted to the guide pin, so that the guide block and the fixed beam are in sliding fit. The guide block can press the serrated template tightly, and the pressing surface of the guide block achieves a uniform pressure effect.

[0024] Furthermore, the clamping assembly includes a lead screw strut and / or a clamping plate; the lead screw strut is used to press down on the workpiece to be repaired to perform clamping, and the clamping plate is used to provide support for the skin workpiece to be repaired, with the contact edge of the clamping plate adapted to the contour of the skin workpiece to be repaired.

[0025] Technical effects of the present invention

[0026] This invention improves processing accuracy: by using the central sawtooth as a reference, it overcomes the deformation caused by composite material bonding; the template and clamping device fit design avoids deformation caused by the template, resulting in high processing consistency. It ensures the sawtooth structure meets design specifications, improving stealth performance. This invention improves efficiency: the tooling simplifies the rework and modification process, reduces rework time, and is suitable for mass production. This invention saves costs: it reduces scrap rate and rework costs. Attached Figure Description

[0027] Figure 1a This is a schematic diagram of the use of the present invention (front view);

[0028] Figure 1b This is a schematic diagram of the use of the present invention (back side);

[0029] Figure 2 This is a schematic diagram of the skin workpiece to be repaired;

[0030] Figure 3 This is a schematic diagram of the edge-pressing mechanism;

[0031] Figure 4 This is a schematic diagram of the pressing mechanism from a low angle.

[0032] Figure 5 A schematic diagram of a uniformly serrated template;

[0033] Figure 6 This is a schematic diagram of a non-uniform sawtooth pattern.

[0034] The components include: a fixed frame 1, a pressing mechanism 2, a clamping assembly 3, a skin workpiece to be repaired 4, a fixed beam 21, a serrated template 22, multiple screw adjustment mechanisms 23, a guide block 24, a clamping block 25, and a positioning hole 221. Detailed Implementation

[0035] The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described, and these examples should not be construed as limited to those set forth herein. Rather, these examples are described so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0036] The embodiment provides a precision shaping tooling for the sawtooth structure of an aircraft wing surface, including a fixing frame 1 and a pressing mechanism 2;

[0037] The fixing frame is a frame, and the middle area of ​​the frame is used to position the skin workpiece to be repaired. The frame is provided with a clamping assembly 3, which can fix the skin workpiece to be repaired relative to the frame.

[0038] Multiple mounting holes are provided along the frame;

[0039] The pressing mechanism includes a fixed beam 21, a serrated template 22, and multiple screw adjustment mechanisms 23; multiple threaded holes are opened along the fixed beam, and each threaded hole is matched with a screw adjustment mechanism.

[0040] The two ends of the fixed beam can be fixed to the frame as one unit by fasteners engaging with the mounting holes of the frame;

[0041] The serrated template is used to attach to the serrated area on the surface of the skin workpiece 4 to be repaired, to assist in the fine repair process.

[0042] Rotating the screw adjustment mechanism allows it to press the serrated template firmly onto the surface of the skin workpiece to be repaired.

[0043] Multiple screw adjustment mechanisms are evenly distributed with a spacing of 100–400 mm.

[0044] The thickness of the serrated template is 2-10 mm.

[0045] The serrated template is a uniformly serrated template.

[0046] The front end of the screw adjustment mechanism is also provided with a clamping block 25.

[0047] The serrated template has positioning holes 221. These holes are used to match the skin mounting holes on the surface of the workpiece to be repaired, achieving precise positioning.

[0048] It also includes a guide block 24, which is provided with a protruding guide pin. The fixed beam has a through hole, which serves as a guide hole and is adapted to the guide pin, so that the guide block and the fixed beam are in sliding fit. The guide block can press the serrated template tightly, and the pressing surface of the guide block achieves a uniform pressure effect.

[0049] The clamping assembly includes a lead screw strut and / or a clamping plate; the lead screw strut is used to press down on the workpiece to be repaired to perform clamping, and the clamping plate is used to provide support for the skin workpiece to be repaired, with the contact edge of the clamping plate adapted to the contour of the skin workpiece to be repaired.

[0050] Descriptions of various advantageous arrangements have been shown for illustrative and descriptive purposes, but such descriptions are not intended to be exclusive or limited to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. Furthermore, different advantageous examples may describe different advantages compared to other advantageous examples. One or more examples have been selected and described in order to best illustrate the principles and practical application of the examples, and to enable those skilled in the art to understand that this disclosure contains various examples with various modifications suitable for the particular intended use.

Claims

1. A precision tooling fixture for modifying the sawtooth structure of an aircraft wing surface, characterized in that: It includes a fixing frame, a pressing mechanism, and a guide block; the fixing frame is a frame, the middle area of ​​which is used to position the skin workpiece to be repaired, and a clamping assembly is provided on the frame, which can fix the skin workpiece to be repaired relative to the frame; multiple mounting holes are opened along the frame; The pressing mechanism includes a fixed beam, a serrated template, and multiple screw adjustment mechanisms; multiple threaded holes are opened along the fixed beam, and each threaded hole is matched with a screw adjustment mechanism. The two ends of the fixed beam can be fixed to the frame as one unit by fasteners engaging with the mounting holes of the frame; the serrated template is used to attach to the serrated area on the surface of the skin workpiece to be repaired to assist in the fine repair process; rotating the screw adjustment mechanism can make the screw adjustment mechanism press the serrated template tightly onto the surface of the skin workpiece to be repaired. The guide block is provided with a protruding guide pin, and the fixed beam has a through hole. The through hole serves as a guide hole and is adapted to the guide pin, so that the guide block and the fixed beam are in sliding fit. The guide block can press the serrated template tightly, and the pressing surface of the guide block achieves a uniform pressure effect. The clamping assembly includes a lead screw strut and / or a clamping plate; the lead screw strut is used to press down on the workpiece to be repaired to perform clamping, the clamping plate is used to provide support for the workpiece to be repaired, and the contact edge of the clamping plate is adapted to the contour of the workpiece to be repaired.

2. The precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: Multiple screw adjustment mechanisms are evenly distributed with a spacing of 100–400 mm.

3. The precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: The thickness of the serrated template is 2-10 mm.

4. The precision shaping tooling for the sawtooth structure of an aircraft wing surface as described in claim 1, characterized in that: The serrated template can be made of aluminum, steel, or plastic.

5. A precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: The serrated template is a non-uniform serrated template.

6. The precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: The serrated template is a uniformly serrated template.

7. A precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: The front end of the screw adjustment mechanism is also provided with a clamping block.

8. A precision shaping fixture for aircraft wing serrated structures as described in claim 1, characterized in that: The serrated template has positioning holes.

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