A dual-purpose mold for manufacturing and assembling a wood stave structure flutter model

Abstract

This invention relates to the field of flutter model technology, and provides a dual-purpose mold for manufacturing and assembling flutter models of wooden frame structures. The mold includes a main body with an inner surface that matches the skin of the flutter model. The inner surface has several intersecting limiting grooves that divide it into several mounting surfaces for supporting the PVC-U boxes. The size of each mounting surface matches the external dimensions of the PVC-U boxes. The width of the limiting grooves is equal to the gap width between adjacent PVC-U boxes. Limiting plates for restricting the position of the PVC-U boxes are provided within the limiting grooves. Mounting grooves are provided on the mounting surfaces, and beam positioning blocks for supporting the beam frames are provided within these grooves. A clamping structure for pressing the beam positioning blocks is detachably connected to each beam positioning block. This invention not only facilitates the fabrication of the skin but also allows for easy control of the assembled flutter model's dimensions, and ensures the consistency and overlap between the skin and the PVC-U boxes.

Description

Technical Field

[0001] This invention relates to the field of flutter model technology, and more specifically, to a dual-purpose mold for manufacturing and assembling flutter models of wooden frame structures. Background Technology

[0002] Flutter is a self-excited vibration phenomenon that occurs when an aircraft moves through airflow, resulting from the interaction of aerodynamic, inertial, and elastic forces. When the flight speed exceeds the flutter velocity, the aircraft structure will be damaged, thus affecting aircraft safety. Therefore, during aircraft development, based on the similarity requirements in aerodynamics, structural dynamics, and geometry, scaled-down flutter models are used in wind tunnels to study the influence of structural parameters on flutter characteristics, verify the flutter characteristics of the designed aircraft, and validate theoretical calculation methods.

[0003] In existing technologies, flutter models often employ wooden frame structures. For example, the applicant provides a dimensional box and flutter wing wind tunnel model in patent publication number "CN117606742A". The flutter model consists of a support beam frame and several dimensional boxes, such as... Figure 1 As shown, the V-shaped box consists of a box body with open ends, formed by four side ribs. A skin is glued to the open ends of the box body. A central rib is also provided in the middle of the box body. Notches are provided at the top of both the side ribs and the central rib for installing support beams. The support beams are installed behind the notches, which are then closed by sealing plates. Currently, this type of model typically only has dedicated molds for skin manufacturing, lacking corresponding assembly molds, making it difficult to control the assembly dimensions of the model after assembly. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-purpose mold for manufacturing and assembling flutter models of wooden frame structures, which enables the manufacturing of the skin while ensuring the installation dimensions of the assembled model.

[0005] This invention is achieved through the following technical solution:

[0006] A dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure includes a mold body with an inner surface that matches the skin of the flutter model. The inner surface has several intersecting limiting grooves that divide the inner surface into several mounting surfaces for supporting the shaped boxes. The size of the mounting surfaces matches the outer dimensions of the shaped boxes. The width of the limiting groove is equal to the gap width between adjacent shaped boxes. A limiting plate for limiting the position of the shaped boxes is provided in the limiting groove.

[0007] Several mounting surfaces are provided with mounting grooves, and the mounting grooves are provided with beam positioning blocks for supporting the beam frame. The beam positioning blocks are detachably connected with clamping structures for pressing them.

[0008] Optionally, the clamping structure includes fastening screws, and the support beam is connected to the beam positioning block by fastening screws.

[0009] Optionally, the clamping structure includes connecting screws and a pressure plate. The positioning block is provided with a beam frame slot for installing the support beam frame. The pressure plate is connected to the positioning block by connecting screws, and the pressure plate clamps the support beam frame.

[0010] Optionally, the depth of the beam frame slot is less than or equal to the thickness of the supporting beam frame.

[0011] Optionally, when one end of the flutter model is flush with one side of the inner surface, that side of the inner surface is connected by fasteners to a side baffle used to limit the position of the shape box.

[0012] Optionally, the height of the limiting plate and the height of the side baffle are less than the minimum height of the PVC box.

[0013] Optionally, the limiting plate is placed inside the limiting groove.

[0014] Optionally, the positioning block is bonded to the mold body or connected by fasteners.

[0015] Optionally, the inner surface has a step formed on the mold body.

[0016] The technical solution of the present invention has at least the following advantages and beneficial effects: In the present invention, the inner surface matches the skin of the flutter model and can be used to apply the skin; the setting limit plate can restrict the degree of freedom of the PVC box, and the setting positioning block can restrict the degree of freedom of the supporting beam frame, which is convenient to control the installation size of the flutter model after assembly. Moreover, since the skin application and model assembly are carried out on the same mold body, the consistency and overlap between the skin and the PVC box can be guaranteed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main body of the mold (unprocessed state);

[0019] Figure 2 This is a schematic diagram of the main body of the mold (in its machined state);

[0020] Figure 3 This is a structural schematic diagram of the main body of the mold (with positioning blocks installed);

[0021] Figure 4 This is a schematic diagram of the positioning block in the second clamping structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the second clamping structure in this invention;

[0023] Figure 6 This invention provides a schematic diagram of a dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure.

[0024] Figure 7 This is a magnified view of a portion of the mold body;

[0025] Figure 8 for Figure 7 A schematic diagram of the structure of the assembled shape box with each rib and the installation limit plate;

[0026] Figure 9 for Figure 8 A schematic diagram of the structure after the support beam frame has been assembled and tightened.

[0027] Figure 10 for Figure 9 A structural diagram showing the structure after the remaining parts of the PVC box have been glued together;

[0028] Icons: 1-Mold body, 101-Inner surface, 102-Limiting groove, 103-Installation surface, 104-Installation groove, 2-Positioning block, 201-Beam frame slot, 3-Fastening screw, 4-Connecting screw, 5-Pressure plate, 6-Limiting plate, 7-Side baffle, 8-Shaped box, 801-Side rib plate, 802-Intermediate rib plate, 9-Supporting beam frame. Detailed Implementation

[0029] refer to Figure 1 A dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure includes a mold body 1. The mold body 1 has an inner surface 101 that matches the skin of the flutter model. It should be understood that the size and shape of the inner surface 101 are consistent with the skin of the flutter model. When manufacturing the skin, the skin is laid on the inner surface 101, and the skin size of the flutter model is obtained after cutting along the edge of the inner surface 101. Furthermore, in this embodiment, the inner surface 101 has a step formed in the mold body 1 to facilitate the laying of the skin.

[0030] refer to Figure 2The inner surface 101 is provided with several intersecting limiting grooves 102 (it should be understood that the skin should be applied before the limiting grooves 102 are machined). The limiting grooves 102 divide the inner surface 101 into several mounting surfaces 103 for supporting the shape-fitting box 8. The size of the mounting surface 103 matches the outer dimensions of the shape-fitting box 8. The width of the limiting groove 102 is equal to the gap width between adjacent shape-fitting boxes 8. The limiting groove 102 is provided with limiting plates 6 for restricting the position of the shape-fitting box 8. It should be understood that the width of the limiting plate 6 is also equal to the gap width between adjacent shape-fitting boxes 8. After the shape-fitting box 8 is placed on the mounting surface 103, there are limiting plates 6 on all four sides to restrict the degree of freedom of the shape-fitting box 8 (see reference). Figures 8-9 ).

[0031] refer to Figure 3 A number of mounting surfaces 103 are provided with mounting grooves 104, and a beam positioning block 2 for supporting the beam frame 9 is provided in the mounting groove 104. A clamping structure for pressing the beam positioning block 2 is detachably connected to it. This arrangement helps to restrict the degree of freedom of the supporting beam frame 9.

[0032] It is evident that the mold provided in this application can not only be used for applying skin, but also restrict the degrees of freedom of the shape box 8 and the support beam 9 when assembling the flutter model, which facilitates the control of the installation dimensions of the flutter model after assembly. Moreover, since the skin application and model assembly are carried out on the same mold body 1, the consistency and overlap between the skin and the shape box 8 can be guaranteed.

[0033] The number of positioning blocks 2 is not limited; it can be more or less as long as it can limit the full degrees of freedom of the supporting beam 9. The fixing method of positioning blocks 2 is not limited, as long as it can be fixed relative to the mold body 1. For example, positioning blocks 2 can be glued to the mold body 1 or connected by fasteners (such as screws).

[0034] In this embodiment, two forms of clamping structure are provided. The first clamping structure (refer to...) Figure 9 and Figure 10 The system includes fastening screws 3. The support beam 9 and the beam positioning block 2 are connected by fastening screws 3. That is, through holes are preset on the support beam 9 and threaded holes are set on the mold body 1. After the support beam 9 is installed, the fastening screws 3 are connected to restrict the degree of freedom of the support beam 9.

[0035] The second type of clamping structure (see reference) Figure 4 and Figure 5The system includes connecting screws 4 and a pressure plate 5. The positioning block 2 has a beam frame slot 201 for installing the support beam 9. The pressure plate 5 is connected to the positioning block 2 by the connecting screws 4, and the pressure plate 5 presses the support beam 9 tightly. Specifically, the pressure plate 5 has at least two through holes, and the mold body 1 has corresponding threaded holes. After the support beam 9 is installed in the beam frame slot 201, the pressure plate 5 is connected by the connecting screws 4 to press the support beam 9 tightly. Furthermore, the depth of the beam frame slot 201 is less than or equal to the thickness of the support beam 9 to ensure that the support beam 9 can be pressed tightly.

[0036] It is easy to understand that in practical applications, only the first or second clamping structure can be used to restrict the degrees of freedom of the supporting beam 9, or a combination of the two clamping structures can be used. It should be understood that the structure of the positioning block 2 is different for different clamping structures.

[0037] refer to Figure 6 (It should be noted that, for ease of observation, the height of the limiting plate 6 and the side baffle 7 in this figure is shown to be higher than that of the shape box 8; and only part of the limiting plate 6 is shown.) When one end of the flutter model is flush with one side of the inner surface 101, the side of the inner surface 101 is connected by fasteners (e.g., screws) to the side baffle 7 used to limit the position of the shape box 8. It is easy to understand that the side baffle 7 acts as the limiting plate 6, that is, to limit the degree of freedom of the shape box 8.

[0038] In this embodiment, the limiting plate 6 is placed within the limiting groove 102 for easy and quick removal. Furthermore, the height of the limiting plate and the height of the side baffle 7 are less than the minimum height of the PVC box 8, which facilitates the application of the skin after assembly.

[0039] Based on the above, the assembly process of the flutter model is as follows:

[0040] S1. Assemble each side rib 801 and middle rib 802 of each dimensional box 8 (usually, adjacent side ribs 801 and side ribs 801 and middle ribs 802 are connected by mortise and tenon structure) and place them on the corresponding mounting surface 103 on the mold body 1.

[0041] S2. After the shaper box 8 is correctly placed, insert the limiting plate 6 into the limiting groove 102, ensuring that each shaper box 8 has a limiting plate 6 on all four sides; at the same time, connect the side baffle 7. The limiting plate 6 and the side baffle 7 together restrict the degrees of freedom of each shaper box 8 (refer to...). Figure 7 and Figure 8 );

[0042] S3. Install the support beam 9. The support beam 9 is supported by the positioning block 2 and fixed by the clamping structure, which restricts its degree of freedom (see reference). Figure 9 );

[0043] S4. After confirming that the gap and relative position between the formwork box 8 and the support beam 9 are correct, then glue the remaining part of the formwork box 8 (refer to...). Figure 10 );

[0044] S5. Attach the model skin and trim the skin according to the boundary line of the upper limit groove 102 of the mold body 1.

[0045] S6. Remove the limiting plate 6 and remove the flutter model from the mold body 1. Assembly is complete.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure, characterized in that, The mold body (1) includes an inner surface (101) that matches the skin of the flutter model. The inner surface (101) is provided with several intersecting limiting grooves (102). The limiting grooves (102) divide the inner surface (101) into several mounting surfaces (103) for supporting the shape box (8). The size of the mounting surface (103) matches the outer dimensions of the shape box (8). The width of the limiting groove (102) is equal to the gap width between adjacent shape boxes (8). The limiting groove (102) is provided with a limiting plate (6) for limiting the position of the shape box (8). A number of mounting surfaces (103) are provided with mounting grooves (104), and the mounting grooves (104) are provided with beam positioning blocks (2) for supporting beams (9). The beam positioning blocks (2) are detachably connected with clamping structures for clamping them. The clamping structure includes fastening screws (3), and the support beam (9) and the beam positioning block (2) are connected by fastening screws (3); Alternatively, the clamping structure includes connecting screws (4) and a pressure plate (5). The positioning block (2) is provided with a beam slot (201) for installing the support beam (9). The pressure plate (5) is connected to the positioning block (2) by connecting screws (4), and the pressure plate (5) clamps the support beam (9). The positioning block (2) is bonded to the mold body (1) or connected by fasteners; Before the limiting groove (102) is processed, the skin is cut along the edge of the inner surface (101) to form the skin size of the flutter model. The inner surface (101) has a step on the mold body (1).

2. The dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure according to claim 1, characterized in that, The depth of the beam frame slot (201) is less than or equal to the thickness of the supporting beam frame (9).

3. The dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure according to claim 1, characterized in that, When one end of the flutter model is flush with one side of the inner surface (101), the side of the inner surface (101) is connected by fasteners to a side baffle (7) used to limit the position of the shape box (8).

4. The dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure according to claim 3, characterized in that, The height of the limiting plate and the height of the side baffle (7) are less than the minimum height of the shaped box (8).

5. The dual-purpose mold for manufacturing and assembling a flutter model of a wooden frame structure according to any one of claims 1-4, characterized in that, The limiting plate (6) is placed in the limiting groove (102).

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