Auxiliary positioning tool for lower portion of aircraft fuselage

Abstract

The utility model belongs to the technical field of aviation assembly and ensures that the tail end of the lower part of a rear fuselage is accurately positioned in the high-low direction. Relates to an auxiliary positioning tool for the lower portion of an aircraft fuselage. The device comprises a theoretical position connector, a fixed connector, a tensioning connector and a tensioning base. According to the utility model, the structural characteristics of the lower part of a machine body product are fully considered, and the structural form of the positioning tool is simplified by adopting the form of the tensioning joint and the theoretical position joint, so that the manufacturing cost of the tool is reduced; therefore, the tool installation cost is low.

Description

Technical Field

[0001] The utility model belongs to the field of aviation assembly technology, ensures accurate positioning of the tail end of the lower part of the rear fuselage in terms of height, and relates to an auxiliary positioning tool for the lower part of the aircraft fuselage. Background Art

[0002] The AG600 is an amphibious aircraft with a structural form significantly different from traditional aircraft. The lower fuselage features a V-shaped bottom structure, with the structure gradually decreasing in size from the center of the fuselage toward the rear. To meet the structural requirements and maintain a balanced production schedule, the V-shaped bottom is formed into a separate lower assembly, which is then assembled on the lower jig. After the lower assembly is assembled, the fuselage and side and roof panels are assembled to form the fuselage components. Due to the unique V-shaped structure of the lower assembly and its gradually decreasing size, the lower assembly is weak and easily deformed. Therefore, accurate positioning of the lower assembly on the final assembly jig becomes a critical issue for fuselage assembly.

[0003] Traditionally, process joints have been used for positioning to ensure accurate product placement. These traditional joints are large, but the lower rear end structure is relatively small, making them difficult to install. Furthermore, traditional tooling positioning utilizes a process joint combined with a positioning plate, with the process joint installed on the product and the positioning plate mounted on the assembly jig. This type of positioning tooling requires high precision for both the process joint and the positioning plate, resulting in high tooling manufacturing costs. Furthermore, the positioning joint requires the use of peelable gaskets for compensation during product installation to ensure accuracy, requiring high worker skill, making the operation difficult and time-consuming. Utility Model Content

[0004] Purpose of the utility model

[0005] The purpose of this utility model is to use a simple method to address the problems of weak rigidity and variability of the lower rear fuselage. Based on the structural characteristics of the lower surface of the lower fuselage product being flat, it is designed to provide an auxiliary positioning fixture to ensure the accurate vertical positioning of the lower rear fuselage tail end. Compared with traditional process joints, this auxiliary positioning fixture has a simple structure and low manufacturing cost. The tensioning joint installed on the product serves as the point of application of the tensioning force, and the positioning accuracy requirements are not high. Therefore, the tensioning joint is easy to operate and time-consuming when installed on the lower part of the product.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: providing an auxiliary positioning joint for the lower fuselage, which, based on the lower structure of the aircraft fuselage and the existing assembly jig structure, can quickly and efficiently achieve accurate high and low positioning of the lower components of the aircraft through low-cost improvements, thereby ensuring product quality and improving assembly efficiency.

[0007] Technical Solution

[0008] An auxiliary positioning tool for the lower part of an aircraft fuselage is characterized in that: as shown in the figure, the rapid positioning device includes a theoretical position joint 1, a fixed joint 2, a tensioning joint 3, and a tensioning base 4.

[0009] The theoretical position joint 1 is an inverted T-shaped structure, and the top surface of the inverted T-shaped structure is provided with a theoretical position joint surface 1a and several measuring holes 1c. The other surface of the inverted T-shaped structure is provided with a mounting hole 1b, which is used to install the theoretical position joint 1 on the fixed joint 2. The fixed joint 2 is a T-shaped structure, and the T-shaped structure is provided with a mounting hole 2a. The bolts pass through the mounting hole 2a and the mounting hole 1b to realize the connection and fixation of the theoretical position joint 1 and the fixed joint 2. The tensioning joint 3 is an inverted I-shaped structure, one end of which is provided with a process connection hole 3a, and the process connection hole 3a is used to connect with the product, and the other end is provided with a first tensioning hole 3b; the tensioning base 4 is an I-shaped structure, and the top surface is provided with a second tensioning hole 4a. The bolts pass through the first tensioning hole 3b and the second tensioning hole 4a to realize the tensioning of the tensioning joint 3 and the tensioning base 4.

[0010] Furthermore, the measuring hole 1c is measured using a laser tracker during the installation of the fixture to ensure that the theoretical position is accurately installed.

[0011] Furthermore, the process connection hole 3a is an oblong hole for process compensation.

[0012] Furthermore, there are four first tightening holes 3 b evenly distributed on the bottom surface of the tightening joint 3 .

[0013] Furthermore, the roughness of the joint surface 1a at the theoretical position is Ra≤1.6.

[0014] Furthermore, the position accuracy of the theoretical position joint surface 1a is required to be 0.2 mm.

[0015] Furthermore, a gap of 5 mm is reserved between the tensioning base 4 and the tensioning joint 3 .

[0016] The beneficial effects of this application are:

[0017] ① The utility model fully considers the characteristics of the lower structure of the fuselage product and adopts the form of tensioning joint + theoretical position joint to simplify the positioning tooling structure and reduce the tooling manufacturing cost. Compared with the traditional positioning tooling, this form of positioning tooling only has higher requirements on the installation position accuracy of the theoretical position joint 1, so the tooling installation cost is lower.

[0018] ② The traditional positioning fixture uses a process joint + positioning card. The process joint is installed on the product. Considering the accumulated tolerance of the product shape, a 0.5mm gap is generally left between the process joint and the product. When installing the process joint, a peelable gasket is added for adjustment to ensure the accurate position of the process joint intersection. Therefore, the installation of the process joint requires a high level of worker skills and a long construction period. The positioning fixture of the utility model is installed on the product, and the tensioning joint is used as the tensioning force point. There is no special positioning requirement. It is connected by the connection hole on the product. It is convenient and quick to install, and the worker skill level is relatively low.

[0019] To sum up, the utility model provides a positioning tool for aircraft components, which has the advantage of overcoming the shortcomings of traditional positioning tooling in the prior art, such as difficulty in operation, high assembly stress, low efficiency, and complex tooling structure, and provides a convenient, efficient, easy-to-operate, and low-cost aircraft assembly auxiliary positioning tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the structural diagram of this special equipment;

[0021] Figure 2 This is a schematic diagram of the use of the tooling of the utility model;

[0022] Figure 3 It is a schematic diagram of the tension joint structure;

[0023] Figure 4 Schematic diagram of the joint structure at the theoretical position;

[0024] Figure 5 It is a schematic diagram of the structure of the fixed joint and tension base;

[0025] Among them: 1 is the theoretical position joint, 2 is the fixed joint, 3 is the tensioning joint, and 4 is the tensioning base. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to the following embodiments. The following are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] The device comprises a theoretical position joint upper surface 1a, a mounting hole 1b, and a measuring hole 1c. The fixed joint 2 comprises a mounting hole 2a. The tensioning joint 3 comprises a process connection hole 3a and a first tensioning hole 3b. The tensioning base 4 comprises a second tensioning hole 4a.

[0028] Fixed joint 2 is fixedly mounted on the assembly jig frame. Theoretical position joint 1 is mounted on fixed joint 2 through mounting holes 1b and 2b. Tensioning base 4 is fixedly mounted on the assembly jig frame. Tensioning joint 3 is mounted on the lower part of the product through process connection hole 3a. When positioning the lower part of the product, connect the first tensioning holes 3b and 4a and tighten the bolts until the lower surface of the product is in close contact with the upper surface 1a of the theoretical position joint, indicating accurate positioning of the lower part in terms of height.

[0029] The theoretical position joint 1 includes a theoretical position joint upper surface 1a, which is fixedly mounted on the fixed joint 2. The theoretical position joint upper surface 1a has a positioning accuracy requirement of 0.2 mm. A measuring hole 1c is provided in the theoretical position joint 1, and a laser measuring instrument is used to assist in installation to ensure accurate positioning of the theoretical position joint upper surface 1a. The surface roughness of the theoretical position joint upper surface 1a should be Ra ≤ 1.6 to prevent scratching of the product. The outer shape of the joint upper surface 1a is the same as the outer shape of the lower surface of the product, which is flat.

[0030] The fixed joint 2 is fixedly installed on the assembly jig frame, and the theoretical position joint 1 is installed on the fixed joint 2 and connected using two Φ5mm bolts.

[0031] The tensioning joint 3 includes a process connection hole 3a and a first tensioning hole 3b. The tensioning joint 3 is mounted on the lower part of the product through the process connection hole 3a and the lower product bolt connection hole. The process connection hole 3a is oblong and is used for process compensation.

[0032] The tensioning base 4 includes a second tensioning hole 4a. It is fixed to the fuselage assembly jig and serves as a support point for tensioning force application. Precision in installation is not critical. A 5mm gap is reserved between the tensioning base 4 and the tensioning joint 3. During assembly and positioning of the lower product, process bolts are used to connect the tensioning joint 3 to the tensioning base 4 through the second tensioning hole 4a and the first tensioning hole 3b. Tightening the bolts to apply tension forces ensures that the lower surface of the product is in close contact with the upper surface 1a of the theoretical joint, indicating accurate positioning of the lower product.

[0033] The following is a further description of this technical solution in conjunction with the accompanying drawings and implementation:

[0034] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: providing an auxiliary positioning tool for the lower part of the aircraft fuselage, which can achieve rapid and accurate positioning of the lower part of the aircraft fuselage through low-cost improvements based on the characteristics of the lower structure of the aircraft and the existing assembly jig structure.

[0035] See attached Figures 1 to 5As shown in the figure: 1 is the theoretical position joint; 2 is the fixed joint; 3 is the tension joint; 4 is the tension base; 5 is the assembly frame; 6 is the lower part of the fuselage; 6a is the lower surface of the lower part of the fuselage. The utility model tooling is characterized by:

[0036] The tooling of the utility model is divided into four parts: a theoretical position joint 1; a fixed joint 2; a tensioning joint 3; and a tensioning base 4.

[0037] The fixed joint 2 is installed on the fuselage assembly jig, and the theoretical position joint 1 is installed on the fixed joint 2. The upper surface 1a of the theoretical position joint is the theoretical shape of the lower part of the fuselage. The position accuracy requirement of the upper surface 1a of the theoretical position joint is 0.2mm, and the surface roughness Ra≤1.6 to prevent the tooling from scratching the product. A laser measurement hole 1c is set on the upper surface 1a of the theoretical position joint, and a laser measuring instrument is used to assist in the installation to ensure the accuracy of the position accuracy of the upper surface 1a of the theoretical position joint. The tensioning base 4 is fixed on the fuselage assembly jig. The tensioning base 4 is the tensioning force support point, and a 5mm gap is left between the tensioning joint 3 and the tensioning base 4.

[0038] The use of this utility model tooling:

[0039] ①Complete the manufacturing of the tooling joint of the utility model;

[0040] ②Fix the theoretical position joint 1, fixed joint 2, and tension base 4 to the assembly jig as required;

[0041] ③ After the lower part of the product is assembled, use the product connection holes and the oblong hole 3a at the upper end of the tensioning joint 3 to install the tensioning joint 3 on the lower part of the fuselage with Φ4.0mm bolts;

[0042] ④ After the lower part of the fuselage is hoisted into the assembly jig, and the positioning joint is connected, use a Φ10mm tensioning bolt to connect the tensioning joint 3 and the tensioning base 4 through the first tensioning hole 3b at the bottom of the tensioning joint 3 and the second tensioning hole 4a at the top of the tensioning base 4;

[0043] ⑤ Tighten the Φ10mm tension bolts so that the lower surface of the fuselage is close to the upper surface 1a of the theoretical position joint, indicating that the height direction of the tail end of the lower fuselage is accurately positioned;

[0044] ⑥ After the fuselage parts are assembled and removed from the shelf, remove the tension joint 3 and rivet the product again.

[0045] In summary, the present invention provides an auxiliary positioning fixture for the lower portion of an aircraft fuselage. The advantages of this fixture are that it overcomes the shortcomings of conventional positioning fixtures in the prior art, such as complex structures, difficult installation, high assembly stress, and low efficiency. The invention provides an auxiliary positioning fixture for the lower portion of an aircraft fuselage that is simple in structure, easy to operate, and highly efficient.

[0046] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which this utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, should not be interpreted in an idealized or overly formal sense. The specific embodiments described above further explain the purpose, technical solutions, and beneficial effects of this utility model in detail. It should be understood that the above description is merely a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. An auxiliary positioning tool for the lower part of an aircraft fuselage, characterized by: It includes a theoretical position joint, a fixed joint, a tensioning joint, and a tensioning base; the theoretical position joint is an inverted T-shaped structure, and the top surface of the inverted T-shaped structure is provided with a theoretical position joint surface and a plurality of measuring holes, and the other surface of the inverted T-shaped structure is provided with a mounting hole for installing the theoretical position joint on the fixed joint, and the fixed joint is a T-shaped structure, and the T-shaped structure is provided with a mounting hole, and the bolts pass through the mounting holes and the mounting holes to realize the connection and fixation of the theoretical position joint and the fixed joint, and the tensioning joint is an inverted I-shaped structure, one end of which is provided with a process connection hole, and the process connection hole is used to connect with the product, and the other end is provided with a first tensioning hole; the tensioning base is an I-shaped structure, and the top surface is provided with a second tensioning hole, and the bolts pass through the first tensioning hole and the second tensioning hole to realize the tensioning of the tensioning joint and the tensioning base.

2. The tooling according to claim 1, wherein: The measuring holes are measured using a laser tracker during tooling installation to ensure accurate installation at the theoretical position.

3. The tooling according to claim 2, wherein: The process connection hole is an oblong hole and is used for process compensation.

4. The tooling according to claim 3, wherein: There are four first tightening holes, which are evenly distributed on the bottom surface of the tightening joint.

5. The tooling according to claim 4, characterized in that: The roughness of the joint surface at the theoretical position is Ra≤1.

6.

6. The tooling according to claim 5, characterized in that: The position accuracy requirement of the joint surface at the theoretical position is 0.2 mm.

7. The tooling according to claim 6, wherein: A 5mm gap is reserved between the tensioning base and the tensioning joint.

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