Ribbed composite cabin forming die

Abstract

The utility model discloses a ribbed composite cabin forming die which comprises a male die and a female die, the male die comprises a small-end flange, a large-end flange and a core die with a large end and a small end, the two ends of the core die are locked through the small-end flange and the large-end flange respectively, and the core die comprises a middle core die and a plurality of outer core dies connected to the periphery of the middle core die; the female die comprises a positioning tool, a base and a die body detachably connected to the base, a containing cavity is formed between the die body and the base, and the shape of the containing cavity is the same as that of the contour surface of the core die so that the cabin skin laid and attached to the male die can be placed; the positioning tool is detachably connected into the containing cavity and used for installing reinforcing ribs, and when the positioning tool is connected into the containing cavity, the reinforcing ribs on the positioning tool are attached to the cabin skin. And the forming efficiency is improved, and the forming operation difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of composite material molding technology, specifically to a mold for molding a reinforced composite material cabin. Background Technology

[0002] With the increasing maturity of composite material molding technology, carbon fiber composite materials are widely used in various fields such as aerospace. More and more metal parts are being made into composite materials to meet requirements such as weight reduction. As a result, many sheet metal parts are being converted into composite parts, which presents many problems in molding and mold design.

[0003] like Figure 1 The reinforced cabin-type composite parts shown have internal reinforcing ribs, and the cabin is larger at one end and smaller at the other, which will cause problems such as difficulty in laying, difficulty in demolding, and difficulty in positioning co-bonded / co-cured parts. Based on the above reasons, a process mold and molding method for converting the male mold to the female mold of the reinforced composite material cabin are designed. Utility Model Content

[0004] The purpose of this invention is to provide a mold for forming a reinforced composite cabin, so as to improve the forming efficiency and reduce the difficulty of forming operation.

[0005] To achieve the above objectives, this utility model employs the following technical solution: This utility model discloses a mold for forming a reinforced composite cabin body, comprising: a male mold, including a small-end flange, a large-end flange, and a core mold with one large end and one small end, the two ends of the core mold being locked together by the small-end flange and the large-end flange respectively, the core mold including an intermediate core mold and multiple outer core molds connected to the outer periphery of the intermediate core mold; a female mold, including a positioning fixture, a base, and a mold body detachably connected to the base, a receiving cavity being formed between the mold body and the base, the shape of the receiving cavity being the same as the shape of the core mold outline surface, for placing the cabin skin laid by the male mold; the positioning fixture is detachably connected to the receiving cavity, the positioning fixture being used to install reinforcing ribs, and when the positioning fixture is connected to the receiving cavity, the reinforcing ribs on the positioning fixture are in contact with the cabin skin.

[0006] Furthermore, the positioning fixture includes a circumferential reinforcing rib positioning fixture for installing annular reinforcing ribs and a longitudinal reinforcing rib positioning fixture for installing longitudinal reinforcing ribs; both the circumferential reinforcing rib positioning fixture and the longitudinal reinforcing rib positioning fixture are mounted on a positioning fixture connecting rod, which is detachably connected to the base.

[0007] Furthermore, the longitudinal reinforcing rib positioning fixture includes a longitudinal reinforcing rib positioning plate, which has an elongated slot along the height direction; screws pass through the elongated slot to install the longitudinal reinforcing rib positioning plate on the base.

[0008] Furthermore, it also includes an annular preform positioning component adapted to the shape of the core mold contour surface; the annular preform positioning component has an outer end face and an inner end face connected to each other, and the hardness of the outer end face is less than the hardness of the inner end face.

[0009] Furthermore, the mold body includes mold body one and mold body two, both of which are connected to the base by bolts. A receiving cavity is formed between mold body one, mold body two and the base.

[0010] Furthermore, the female mold also includes multiple positioning blocks, which are evenly distributed at the ends of the receiving cavity for positioning the annular preform positioning component.

[0011] Furthermore, the outer core mold includes an upper core mold, a right core mold, a lower core mold, and a left core mold; the upper core mold, the right core mold, the lower core mold, and the left core mold are respectively connected around the middle core mold and connected by wedge blocks.

[0012] Furthermore, the two ends of the core mold are connected by screws and small-end flanges and large-end flanges.

[0013] According to the above technical solution, this utility model has at least the following beneficial effects: The utility model sets up small-end flanges and large-end flanges, simplifying the laying process and reducing the operational difficulty caused by complex curved surfaces; the core mold adopts a segmented design, which on the one hand facilitates fine laying in specific areas, helping to solve the problem of local laying; on the other hand, the core mold includes a segmented structure of an intermediate core mold and an outer core mold, facilitating demolding and reducing the risk of damage to the finished product; this utility model adopts a form of male and female mold cooperation, first forming the cabin skin through the male mold, and then forming the reinforced composite cabin body as a whole through the female mold, which can accurately install the reinforcing ribs and ensure accurate fitting between the reinforcing ribs and the cabin skin, solving the positioning problem of co-bonded / co-cured parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a ribbed cabin-type composite part in the background art;

[0015] Figure 2 This is a longitudinal structural sectional view of the male mold of this utility model;

[0016] Figure 3 This is a schematic diagram of the male mold of this utility model;

[0017] Figure 4 This is a cross-sectional view of the male mold of this utility model from the side.

[0018] Figure 5 This is a schematic diagram of the structure of the female mold of this utility model;

[0019] Figure 6 for Figure 5Schematic diagram of the structure after removing the phantom;

[0020] Figure 7 For this utility model Figure 6 Schematic diagram of the structure for installing reinforcing ribs;

[0021] Figure 8 This is a schematic diagram of the annular prefabricated positioning component in this utility model.

[0022] The components are as follows: 1. Hull skin; 2. Longitudinal reinforcing rib; 3. Annular reinforcing rib; 4. Annular precast body; 11. Upper core mold; 12. Right core mold; 13. Lower core mold; 14. Left core mold; 15. Middle core mold; 16. Small end flange; 17. Large end flange; 18. Locking block one; 19. Locking block two; 21. Mold body one; 22. Mold body two; 23. Base; 24. Left positioning block; 25. Upper positioning block; 26. Right positioning block; 27. Lower positioning block; 28. Circumferential reinforcing rib positioning fixture; 29. ​​Longitudinal reinforcing rib positioning fixture; 210. Positioning fixture connecting rod; 211. Screw; 30. Annular precast body positioning component; 301. Outer end face; 302. Inner end face. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] It should be noted that in the description of this utility model, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this utility model refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0025] like Figures 2-8As shown, a mold for forming a reinforced composite cabin includes a male mold and a female mold. The male mold includes a small-end flange 16, a large-end flange 17, and a core mold with one end larger than the other. The two ends of the core mold are locked together by the small-end flange 16 and the large-end flange 17, respectively. The core mold includes an intermediate core mold 15 and multiple outer core molds connected to the outer periphery of the intermediate core mold 15. The female mold includes a positioning fixture, a base 23, and a mold body detachably connected to the base 23. A receiving cavity is formed between the mold body and the base 23. The shape of the receiving cavity is the same as the shape of the core mold outline to place the cabin skin 1 laid by the male mold. The positioning fixture is detachably connected to the receiving cavity. The positioning fixture is used to install reinforcing ribs. When the positioning fixture is connected to the receiving cavity, the reinforcing ribs on the positioning fixture fit against the cabin skin 1.

[0026] The assembly and molding process of this utility model includes: firstly, combining the intermediate core mold 15 with multiple outer core molds to form a core mold with one end larger than the other, and then fixing the small-end flange 16 and the large-end flange 17 to both ends of the core mold. This forms a male mold structure with one end larger than the other and a flange, which is used for subsequent composite material layup.

[0027] Skin Laying: The mandrel is placed on the existing rotating equipment through the small end flange 16 and the large end flange 17. Composite prepreg or fabric is laid on the surface of the mandrel. The male mold is rotated to facilitate the laying of the composite skin at different angles. After laying the appropriate number of composite layers, the composite material is cured by heating, pressurizing or other curing processes to form the cabin skin 1. Then the small end flange and the large end flange are removed, and the intermediate mandrel is first pulled out from the large end, and then the outer mandrel is pulled out to obtain the cabin skin 1.

[0028] Assemble the female mold: Install the mold body onto the base 23. Ensure that the shape of the receiving cavity formed between the base 23 and the mold body is consistent with the shape of the male mold core surface through the cavity machining of the base 23 and the mold body, that is, the cabin skin 1 can be smoothly installed into the receiving cavity.

[0029] Install the cabin skin 1 into the receiving cavity, and then install the positioning fixture inside the receiving cavity, using the reinforcing ribs on the positioning fixture to tightly fit the cabin skin 1. The composite material is cured through heating, pressurization, or other curing processes to form a reinforced composite cabin. After curing, remove the positioning fixture and remove the mold from the base 23 to obtain the reinforced composite cabin.

[0030] First, this invention features a small-end flange 16 and a large-end flange 17. By placing the male mold on a rotating device, the composite material skin can be easily laid at different angles, greatly simplifying the laying process and reducing operational difficulties caused by complex curved surfaces. Second, the core mold adopts a segmented design. On the one hand, it facilitates precise laying in specific areas, helping to solve the problem of localized laying. On the other hand, the core mold includes a segmented structure of an intermediate core mold and an outer core mold, which facilitates demolding. The intermediate core mold is disassembled first from the large end, followed by the outer core mold, ensuring the effectiveness of demolding and reducing the risk of damage to the finished product. Third, this invention uses a combination of male and female molds. The male mold first forms the cabin skin 1, and then the female mold forms the reinforced composite cabin as a whole. This allows for precise installation of reinforcing ribs, ensuring accurate fitting between the reinforcing ribs and the cabin skin, and solving the positioning problem of co-bonded / co-cured parts. This invention also features a detachable positioning fixture, which allows adjustment of the reinforcing rib position as needed, ensuring a good bond between the reinforcing ribs and the cabin skin. In summary, this invention improves the laying efficiency of composite material skins and simplifies the process; the segmented design and rotary laying simplify the laying and demolding process and reduce the difficulty of operation.

[0031] The present invention will be described below through a specific embodiment.

[0032] The male mold is used to form the cabin skin 1. The male mold consists of an intermediate core mold 15, an outer core mold (upper core mold 11, right core mold 12, lower core mold 13, left core mold 14), a small end flange 16, a large end flange 17, a locking block one 18, a locking block two 19, and standard parts.

[0033] The product is narrow at one end, wide at the other, and concave in the middle. It cannot be demolded as a whole after installation and needs to be divided into sections. Based on the internal shape of the product, the hull skin male mold installation mold is set to five sections, such as... Figure 2 As shown.

[0034] During assembly, using the intermediate core mold 15 as a reference, the upper core mold 11, lower core mold 13, left core mold 14, and right core mold 12 are installed from the small end to the large end, respectively. Each outer core mold is connected and fixed to the intermediate core mold 15 at the contact point using locking block one 18 or locking block two 19. Specifically, locking block one 18 and locking block two 19 are wedge-shaped, and the locking blocks pull and lock the outer core mold and intermediate core mold 15 together, ensuring that the gap between the outer core mold and intermediate core mold 15 meets the usage requirements. After assembling the outer core mold and intermediate core mold 15 into a core mold with one end larger than the other, the small end flange 16 and large end flange 17 are installed. Both the small end flange 16 and large end flange 17 have a support rod at their center. Specifically, screw holes can be provided at the ends of the outer core mold and intermediate core mold 15, and screws are passed through the small end flange 16 and large end flange 17 for overall positioning and locking. The male mold for installation can be placed on the frame and rotated for installation using the support rod at the flange end.

[0035] After the hull skin 1 is laid and pre-extracted, the laying mold needs to be demolded. During demolding, the flanges at both ends (small end flange 16 and large end flange 17) must first be removed. Then, locking block 18 and locking block 2 19 are pulled out. The middle core mold 15 has a draft angle of approximately two degrees. The middle core mold 15 is pulled out from the small end to the large end. Then, the upper core mold 11 is moved downwards to the middle and demolded from the small end to the large end. The lower core mold 13 is moved upwards to the middle and demolded from the small end to the large end. Finally, the left core mold 14 and the right core mold 12 are moved to the middle for demolding. After demolding, the hull skin 1 is obtained.

[0036] Based on the obtained cabin skin 1, a ribbed cabin can be obtained by using a negative mold. The negative mold consists of mold body 1 21, mold body 22, base 23, annular precast positioning fixture assembly (left positioning block 24, upper positioning block 25, right positioning block 26, lower positioning block 27), circumferential reinforcing rib positioning fixture 28, longitudinal reinforcing rib positioning fixture 99, positioning fixture connecting rod 210, screws 211, and standard parts.

[0037] During use, only mold body 1 (21), mold body 2 (22), and base 23 are installed; other parts are not installed initially. Specifically, mold body 1 (21) and mold body 2 (22) have identical shapes. Both mold body 1 (21) and mold body 2 (22) are connected to base 23 by bolts. A receiving cavity is formed between mold body 1 (21), mold body 2 (22), and base 23. The cabin skin 1 is transferred into the receiving cavity by scribing lines. Then, bag pre-extraction is performed to ensure that the cabin covering parts fit snugly against the female mold forming mold and have a certain degree of rigidity.

[0038] After installing the circumferential reinforcing rib positioning fixture 28 and the longitudinal reinforcing rib positioning fixture 29 onto the positioning fixture connecting rod 210, install the left and right positioning fixture connecting rods 210 onto the base 23. Then, position the already cured longitudinal reinforcing rib 2 of the product part by fitting it against the positioning surface of the longitudinal reinforcing rib positioning fixture 29. Figure 7 As shown; the already cured part's annular reinforcing rib 3 is also positioned by the circumferential reinforcing rib positioning fixture 28. At this point, the skin, longitudinal reinforcing rib, and annular reinforcing rib are combined.

[0039] Furthermore, the longitudinal reinforcing rib positioning fixture 29 includes a longitudinal reinforcing rib positioning plate, which has an elongated slot along the height direction; a screw 211 passes through the elongated slot to install the longitudinal reinforcing rib positioning plate on the base 23, and the height of the longitudinal reinforcing rib positioning plate on the base 23 can be adjusted by the design of the elongated slot.

[0040] When removing the fixture, the longitudinal reinforcing rib 2 will block the longitudinal reinforcing rib positioning fixture 29. Twist the screw 211 and slide the longitudinal reinforcing rib positioning plate in the longitudinal reinforcing rib positioning fixture 29 downward to remove the entire positioning assembly.

[0041] Assembling the annular precast body 4 requires first manufacturing the annular precast body positioning component 30, such as... Figure 8 As shown, the annular preform positioning component 30 is L-shaped and conforms to the shape of the annular preform 4. The annular preform positioning component 30 has an outer end face 301 and an inner end face 302. The hardness of the outer end face 301 is less than that of the inner end face 302. Furthermore, the outer end face 301 is a soft surface, and the inner end face 302 is a hard surface. This design ensures that one side in the longitudinal direction is relatively soft and deformable, while the other side in the circumferential direction is hard and cannot be deformed.

[0042] First, assemble the annular preform 4 with the annular preform positioning component 30 together, that is, directly insert the annular preform positioning component 30 into the annular preform 4. Then, install the annular preform positioning fixture assembly (left positioning block 24, upper positioning block 25, right positioning block 26, and lower positioning block 27) on the end of the female mold. Further, the left positioning block 24 and the right positioning block 26 are respectively connected to the mold body 1 21 and the mold body 22 by screws, the lower positioning block 27 is set on the base 23, and the upper positioning block 25 is connected between the mold body 1 21 and the mold body 22, limiting the position in four directions: up, down, left, and right.

[0043] The annular preform positioning fixture 30 is positioned to indirectly position the annular preform 4. The annular preform positioning fixture 30 has one soft side and one hard side to ensure that pressure is received on both sides during bag making, thus ensuring that the product will not have quality problems such as damage.

[0044] The molding method based on the molding die of this utility model includes:

[0045] Place the male mold on the support frame and rotate the male mold to lay composite material to form the cabin skin 1.

[0046] Remove the small end flange 16 and the large end flange 17 from the mandrel, pull out the middle mandrel 15 from the large end, and then move the multiple outer mandrels toward the middle and pull them out from the large end.

[0047] Transfer the cabin skin 1 and fit it into the cavity of the negative mold.

[0048] Install the positioning fixture into the receiving cavity so that the reinforcing ribs on the positioning fixture fit snugly against the cabin skin 1.

[0049] Install the annular precast positioning component 30 into the annular precast 4.

[0050] The annular prefabricated positioning component 30 is connected to the cabin skin 1, and an annular prefabricated positioning assembly is provided at the end of the receiving cavity to position the annular prefabricated positioning component 30.

[0051] The annular preform positioning component 30 with annular preform 4, as well as the reinforcing ribs and cabin skin 1, are cured.

[0052] Remove the positioning fixture and the mold on the base 23, and take out the reinforced composite material cabin.

[0053] In summary, this utility model has the following advantages: the cabin skin and the cabin ring preform are co-cured and integrally molded, ensuring the integrity of the molded structure and meeting the required mechanical properties of the product. The use of a male mold for application and a female mold for curing reduces the risk of defects such as wrinkles and bridging, while the female mold curing ensures the aerodynamic surface roughness and shape requirements. The co-curing design incorporates a semi-soft, semi-hard ring preform positioning component 30 (a composite process component made of uncured non-silicone rubber mixed with carbon fiber prepreg), which can both position the ring preform and ensure that the co-cured preform is fully subjected to pressure. The core mold adopts a split structure, simplifying demolding. The positioning fixture is fixedly connected to the molding die, serving as both a molding die and a bonding fixture, achieving dual functionality and saving costs.

[0054] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A molding die for a reinforced composite cabin body, characterized in that, include: The male mold includes a small end flange (16), a large end flange (17) and a core mold with one large end and one small end. The two ends of the core mold are locked by the small end flange (16) and the large end flange (17) respectively. The core mold includes an intermediate core mold (15) and a plurality of outer core molds connected to the outer periphery of the intermediate core mold (15). The female mold includes a positioning fixture, a base (23), and a mold body detachably connected to the base (23). A receiving cavity is formed between the mold body and the base (23). The shape of the receiving cavity is the same as the shape of the core mold outline surface, so as to place the cabin skin (1) to be laid by the male mold. The positioning fixture is detachably connected to the receiving cavity. The positioning fixture is used to install reinforcing ribs. When the positioning fixture is connected to the receiving cavity, the reinforcing ribs on the positioning fixture fit with the cabin skin (1).

2. The ribbed composite cabin molding die according to claim 1, characterized in that, The positioning fixture includes a circumferential reinforcing rib positioning fixture (28) for installing the circumferential reinforcing rib (3) and a longitudinal reinforcing rib positioning fixture (29) for installing the longitudinal reinforcing rib (2). The circumferential reinforcing rib positioning fixture (28) and the longitudinal reinforcing rib positioning fixture (29) are both installed on the positioning fixture connecting rod (210), and the positioning fixture connecting rod (210) is detachably connected to the base (23).

3. The reinforcing composite cabin molding die according to claim 2, characterized in that, The longitudinal reinforcing rib positioning fixture (29) includes a longitudinal reinforcing rib positioning plate, which has a long slot along the height direction; A screw (211) passes through a long slot to mount the longitudinal reinforcing rib positioning plate onto the base (23).

4. The ribbed composite cabin molding die according to claim 1, characterized in that, It also includes an annular preform positioning element (30) that is adapted to the shape of the core mold contour surface. The annular preform positioning component (30) has an outer end face (301) and an inner end face (302) connected to each other, and the hardness of the outer end face (301) is less than the hardness of the inner end face (302).

5. The ribbed composite cabin molding die according to claim 1, characterized in that, The mold includes a first mold (21) and a second mold (22). The first mold (21) and the second mold (22) are connected to the base (23) by bolts. The first mold (21) and the second mold (22) are connected by bolts, and a receiving cavity is formed between the first mold (21), the second mold (22) and the base (23).

6. The ribbed composite cabin molding die according to claim 5, characterized in that, The female mold also includes multiple positioning blocks, which are evenly distributed at the end of the receiving cavity for positioning the annular preform positioning element (30).

7. The ribbed composite cabin molding die according to claim 1, characterized in that, The outer core mold includes an upper core mold (11), a right core mold (12), a lower core mold (13), and a left core mold (14). The upper core mold (11), right core mold (12), lower core mold (13) and left core mold (14) are respectively connected around the middle core mold (15) and connected by wedge blocks.

8. The ribbed composite cabin molding die according to claim 1, characterized in that, The two ends of the core mold are connected by screws and small end flange (16) and large end flange (17).

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