Ribbed composite cabin forming die and forming method

Abstract

The invention discloses a ribbed composite cabin forming die and a forming method.The ribbed composite cabin forming die 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 one large end and the other small end, and the two ends of the core die are locked through the small-end flange and the large-end flange respectively; the core mold comprises a middle core mold and a plurality of outer core molds connected to the periphery of the middle core mold; 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] The present invention relates to the technical field of composite material forming, and in particular to a ribbed composite cabin body forming die and a forming method. Background Art

[0002] As composite material molding technology becomes increasingly mature, carbon fiber composite materials are widely used in various fields such as aerospace. In order to reduce weight and other requirements, more and more metal parts are composited. Then many sheet metal metal parts are converted into composite parts, which causes many problems in molding and mold design.

[0003] like Figure 1 The ribbed cabin-type composite parts shown have internal reinforcing ribs, and one end of the cabin is larger than the other end, which will cause difficulties in laying, demoulding, and positioning of co-bonded / co-cured parts. Based on the above reasons, a ribbed composite cabin positive mold to negative mold process mold and molding method are designed. Summary of the invention

[0004] The object of the present invention is to provide a ribbed composite cabin body forming mold and a forming method to improve the forming efficiency and reduce the difficulty of the forming operation.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In the first aspect, the present invention discloses a ribbed composite cabin forming mold, comprising: a male mold, comprising a small end flange, a large end flange and a core mold with one end larger than the other end, the two ends of the core mold being locked by the small end flange and the large end flange respectively, the core mold comprising an intermediate core mold and a plurality of outer core molds connected to the outer periphery of the intermediate core mold; a female mold, comprising a positioning tool, 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 contour surface of the core mold so as to place the cabin skin laid by the male mold; the positioning tool being detachably connected in the receiving cavity, the positioning tool being used to install reinforcing ribs, and when the positioning tool is connected in the receiving cavity, the reinforcing ribs on the positioning tool are fitted with the cabin skin.

[0007] Furthermore, the positioning tooling includes an annular reinforcement rib positioning tooling for installing annular reinforcement ribs and a longitudinal reinforcement rib positioning tooling for installing longitudinal reinforcement ribs; the annular reinforcement rib positioning tooling and the longitudinal reinforcement rib positioning tooling are both installed on the positioning tooling connecting rod, and the positioning tooling connecting rod is detachably connected to the base.

[0008] Furthermore, the longitudinal reinforcement rib positioning tool includes a longitudinal reinforcement rib positioning plate, and the longitudinal reinforcement rib positioning plate is provided with a long slot hole along the height direction; screws penetrate the long slot hole to install the longitudinal reinforcement rib positioning plate on the base.

[0009] Furthermore, it also includes an annular preform positioning piece adapted to the shape of the core mold contour surface; the annular preform positioning piece 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.

[0010] Furthermore, the mold body includes mold body 1 and mold body 2, and mold body 1 and mold body 2 are both connected to the base through bolts. Mold body 1 and mold body 2 are connected through bolts, and a receiving cavity is formed between mold body 1, mold body 2 and the base.

[0011] Furthermore, the female mold further comprises a plurality of positioning blocks, and the plurality of positioning blocks are evenly distributed at the end of the accommodating cavity for positioning the annular preform positioning piece.

[0012] 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 through wedge blocks.

[0013] Furthermore, the two ends of the core mold are connected by screws and a small end flange and a large end flange.

[0014] In a second aspect, the present invention discloses a method for forming a ribbed composite cabin, using the forming mold described in any one of the first aspects, the method comprising: placing a male mold on a support frame, rotating the male mold to lay the composite material to form a cabin skin; removing the small end flange and the large end flange from the core mold, pulling out the middle core mold from the large end, and then moving multiple outer core molds toward the middle and pulling them out from the large end; transferring the cabin skin and fitting it into the accommodating cavity of the female mold; installing a positioning tool into the accommodating cavity, fitting the reinforcement ribs on the positioning tool and the cabin skin, and co-gluing and curing the reinforcement ribs and the cabin skin to form a ribbed composite cabin; removing the positioning tool and the mold body on the base, and taking out the ribbed composite cabin.

[0015] Furthermore, before and after the reinforcing ribs and the cabin skin are co-glued and cured, the method also includes: installing the annular preform positioning piece into the annular preform; connecting the annular preform positioning piece to the cabin skin, and providing an annular preform positioning group at the end of the accommodating cavity to position the annular preform positioning piece; and curing the annular preform positioning piece having the annular preform and the cabin skin.

[0016] According to the above technical scheme, the present invention has at least the following beneficial effects: the present invention arranges a small end flange and a large end flange, simplifies the paving process, and reduces the difficulty of operation caused by complex curved surfaces; the core mold adopts a block design, on the one hand, it is convenient for fine paving in a specific area, which helps to solve the problem of local paving, and on the other hand, the core mold includes an intermediate core mold and an outer core mold block structure, which is convenient for demoulding and reduces the risk of damage to the finished product; the present invention adopts the form of cooperation between a male mold and a female mold, firstly forms the cabin skin through a male mold, and then forms the entire ribbed composite cabin through a female mold, which can accurately install the reinforcement ribs to ensure the accurate fit of the reinforcement ribs to the cabin skin, and solves the positioning problem of co-bonded / co-cured parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a composite material part of a cabin with ribs in the background technology;

[0018] Figure 2 It is a longitudinal structural cross-sectional view of the male mold of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the male mold of the present invention;

[0020] Figure 4 It is a cross-sectional view of the structure of the male mold of the present invention;

[0021] Figure 5 It is a schematic structural diagram of the female mold of the present invention;

[0022] Figure 6 for Figure 5 Schematic diagram of the structure of the removed model;

[0023] Figure 7 For the present invention Figure 6 Structural diagram of installing reinforcement ribs;

[0024] Figure 8 It is a schematic diagram of the annular preform positioning member in the present invention.

[0025] Among them: 1. Cabin skin; 2. Longitudinal stiffener; 3. Annular stiffener; 4. Annular preform; 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 one; 22. Mold two; 23. Base; 24. Left positioning block; 25. Upper positioning block; 26. Right positioning block; 27. Lower positioning block; 28. Annular stiffener positioning tool; 29. ​​Longitudinal stiffener positioning tool; 210. Positioning tool connecting rod; 211. Screw; 30. Annular preform positioning piece; 301. Outer end face; 302. Inner end face. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0028] like Figure 2~Figure 8 As shown, a ribbed composite cabin forming mold comprises a male mold and a female mold, the male mold comprises a small end flange 16, a large end flange 17 and a core mold with one end larger than the other 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 comprises 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 comprises a positioning tool, 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 contour surface, so as to place the cabin skin 1 laid by the male mold; the positioning tool is detachably connected in the receiving cavity, the positioning tool is used to install reinforcing ribs, and when the positioning tool is connected in the receiving cavity, the reinforcing ribs on the positioning tool are fitted with the cabin skin 1.

[0029] The assembly molding process of the present invention includes: firstly, the middle core mold 15 is combined with a plurality of outer core molds to form a core mold with one end larger than the other end, and the small end flange 16 and the large end flange 17 are fixed to the two ends of the core mold. In this way, a male mold structure with one end larger than the other end and having a flange is formed for subsequent composite material layer laying.

[0030] Laying the skin: The core mold is placed on the existing rotating equipment through the small end flange 16 and the large end flange 17, and composite prepreg or fabric is laid on the surface of the core mold. The male mold is controlled to rotate so as to lay the composite skin at different angles. After laying the appropriate number of layers of composite materials, the composite materials are 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 middle core mold is first pulled out from the large end, and then the outer core mold is pulled out to obtain the cabin skin 1.

[0031] Assemble the female mold: install the mold body on the base 23, and ensure that the shape of the accommodating cavity formed between the base 23 and the mold body is consistent with the contour surface shape of the male mold core mold through cavity processing, that is, the cabin skin 1 can be smoothly installed in the accommodating cavity.

[0032] The cabin skin 1 is installed in the accommodating cavity, and then a positioning fixture is installed inside the accommodating cavity, and the reinforcing ribs on the positioning fixture are used to closely fit the cabin skin 1. The composite material is cured by heating, pressurizing or other curing processes to form a ribbed composite cabin. After curing is completed, the positioning fixture is removed, and the mold on the base 23 is removed to obtain a ribbed composite cabin.

[0033] First, the present invention sets a small end flange 16 and a large end flange 17, and places the male mold on a rotating device, so that the composite material skin can be easily laid at different angles, which greatly simplifies the laying process and reduces the difficulty of operation caused by complex curved surfaces; secondly, the core mold adopts a block design, which is convenient for fine laying in a specific area on the one hand, which helps to solve the problem of local laying. On the other hand, the core mold includes an intermediate core mold and an outer core mold block structure, which is convenient for demoulding. The intermediate core mold is first disassembled from the large end, and then the outer core mold is disassembled, which ensures the effectiveness of demoulding and reduces the risk of damage to the finished product; furthermore, the present invention adopts the form of male mold and female mold cooperation, firstly forms the cabin skin 1 through the male mold, and then forms the composite cabin body with ribs as a whole through the female mold, which can accurately install the reinforcement ribs, ensure the accurate fit of the reinforcement ribs and the cabin skin, and solve the positioning problem of the co-bonded / co-cured parts. The present invention also designs that the positioning tool is detachable, and the position of the reinforcement ribs can be adjusted as needed, ensuring the good combination of the reinforcement ribs and the cabin skin. In summary, the present invention improves the laying efficiency of the composite material skin and simplifies the process flow; the block design and rotary laying simplify the laying and demoulding process and reduce the difficulty of operation.

[0034] The present invention is described below by means of a specific embodiment.

[0035] The male mold is used to form the cabin skin 1, and the male mold consists of a middle core mold 15, an outer core mold (an upper core mold 11, a right core mold 12, a lower core mold 13, and a left core mold 14), a small end flange 16, a large end flange 17, a locking block 18, a locking block 2 19, and standard parts.

[0036] The product is small at one end and large at the other end with a depression in the middle. It cannot be demoulded as a whole after paving. It needs to be divided into blocks. According to the inner surface of the product, the cabin skin positive mold paving mold is set to five pieces, such as Figure 2 shown.

[0037] During assembly, the middle core mold 15 is used as a reference, and the upper core mold 11, the lower core mold 13, the left core mold 14 and the right core mold 12 are installed from the small end to the large end. Each outer core mold is connected and fixed to the middle core mold 15 by a locking block 18 or a locking block 2 19. Specifically, the locking block 18 and the locking block 2 19 are wedge-shaped, and the outer core mold and the middle core mold 15 are pulled and locked to each other by the locking blocks to ensure that the gap between the outer core mold and the middle core mold 15 meets the use requirements. After the outer core mold and the middle core mold 15 are assembled into a core mold with one end larger than the other end, the small end flange 16 and the large end flange 17 are installed, and the small end flange 16 and the large end flange 17 are both provided with support rods at the center. Specifically, screw holes can be provided at the ends of the outer core mold and the middle core mold 15, and screws are passed through the small end flange 16 and the large end flange 17 to perform overall positioning and locking. The paving male mold can be placed on the rack through the support rod at the flange end for rotating paving.

[0038] After the hull skin 1 is laid and pre-drawn, it is necessary to demold the laying mold. When demolding, the flanges at both ends (small end flange 16 and large end flange 17) need to be removed first. Then pull out the locking block 18 and locking block 2 19. The middle core mold 15 has a draft angle of about two degrees. Pull out the middle core mold 15 from the small end to the large end, and then move the upper core mold 11 downward to the middle and remove it from the small end to the large end. Move the lower core mold 13 upward to the middle and remove it from the small end to the large end. Finally, move the left core mold 14 and the right core mold 12 to the middle for demolding. After demolding, the hull skin 1 is obtained.

[0039] The ribbed hull can be obtained by using a negative mold on the basis of the hull skin 1. The negative mold is composed of a mold body 1 21, a mold body 22, a base 23, an annular preform positioning tooling group (left positioning block 24, upper positioning block 25, right positioning block 26, lower positioning block 27), annular reinforcement rib positioning tooling 28, longitudinal reinforcement rib positioning tooling 99, positioning tooling connecting rod 210, screws 211 and standard parts.

[0040] When in use, only mold body 1 21, mold body 22, and base 23 are installed, and the other parts are not installed yet. Specifically, mold body 1 21 and mold body 2 22 have the same shape, and mold body 1 21 and mold body 2 22 are connected to base 23 by bolts. Mold body 1 21 and mold body 2 22 are connected by bolts, and a receiving cavity is formed between mold body 1 21, mold body 2 22 and base 23. The cabin skin 1 is transferred to the receiving cavity through the scoring line, and then the bag is pre-drawn to ensure that the cabin paving parts are integrally fitted with the female mold forming mold and have a certain hardness.

[0041] After the annular reinforcement rib positioning fixture 28 and the longitudinal reinforcement rib positioning fixture 29 are installed on the positioning fixture connecting rod 210, the left and right positioning fixture connecting rods 210 are installed on the base 23, and then the cured product part longitudinal reinforcement rib 2 is positioned by fitting it with the positioning surface of the longitudinal reinforcement rib positioning fixture 29, as shown in FIG. Figure 7 As shown; the annular reinforcement rib 3 of the solidified part is also positioned by the annular reinforcement rib positioning tool 28, so far, the skin and the longitudinal reinforcement ribs and the annular reinforcement ribs are combined.

[0042] Furthermore, the longitudinal reinforcement rib positioning tool 29 includes a longitudinal reinforcement rib positioning plate, which is provided with a long slot hole along the height direction; the screw 211 passes through the long slot hole to install the longitudinal reinforcement rib positioning plate on the base 23, and the height of the longitudinal reinforcement rib positioning plate on the base 23 can be adjusted through the design of the long slot hole.

[0043] When removing the tooling, the longitudinal reinforcing rib 2 will block the longitudinal reinforcing rib positioning tooling 29. The screw 211 is twisted to slide the longitudinal reinforcing rib positioning plate in the longitudinal reinforcing rib positioning tooling 29 downward, and the entire positioning assembly can be removed.

[0044] The annular preform 4 assembly requires the manufacture of an annular preform positioning member 30, such as Figure 8 As shown. The annular preform positioning member 30 is L-shaped, conforming to the shape of the annular preform 4, and has an outer end face 301 and an inner end face 302, and the hardness of the outer end face 301 is less than the hardness 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 can ensure that one side in the longitudinal direction is soft and can be deformed, and one side in the circumferential direction is a hard surface and cannot be deformed.

[0045] First, assemble the annular preform 4 and the annular preform positioning member 30 together, that is, directly insert the annular preform positioning member 30 into the annular preform 4. Then install the annular preform positioning tooling group (left positioning block 24, upper positioning block 25, right positioning block 26, 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 2 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 2 22, and is limited in four directions of up, down, left and right.

[0046] The annular preform positioning piece 30 is positioned by the annular preform positioning tooling assembly, and the annular preform 4 is positioned indirectly. The annular preform positioning piece 30 is soft on one side and hard on the other side, ensuring that both sides can receive pressure during bag making and ensuring that the product will not have quality problems such as damage.

[0047] Based on the molding die of the present invention, the present invention also discloses a molding method, comprising:

[0048] The male mold is placed on a support frame, and the male mold is rotated to lay composite materials to form a cabin skin 1.

[0049] The small end flange 16 and the large end flange 17 are removed from the core mold, the middle core mold 15 is pulled out from the large end, and then the plurality of outer core molds are moved toward the middle and pulled out from the large end.

[0050] The cabin skin 1 is transferred and fitted into the accommodating cavity of the female mold.

[0051] The positioning fixture is installed in the accommodating cavity so that the reinforcing ribs on the positioning fixture fit in with the cabin skin 1.

[0052] The annular preform positioning member 30 is installed into the annular preform 4 .

[0053] The annular preform positioning member 30 is connected to the cabin skin 1 , and an annular preform positioning group is arranged at the end of the accommodating cavity to position the annular preform positioning member 30 .

[0054] The annular preform positioning member 30 having the annular preform 4 , the reinforcing ribs and the cabin skin 1 are solidified.

[0055] The positioning fixture and the mold on the base 23 are removed, and the ribbed composite cabin is taken out.

[0056] In summary, the present invention has the following advantages: the cabin skin and the cabin annular preform are integrally formed by co-curing, which ensures the integrity of the molding structure and meets the mechanical properties required by the product. The positive mold is laid and the negative mold is cured. The positive mold laying can reduce the risk of defects such as wrinkles and bridging, and the negative mold curing ensures the roughness of the aerodynamic surface and the appearance requirements; the co-curing is designed with a semi-soft and semi-hard annular preform positioning part 30 (a composite process part of uncured non-silicone rubber doped with carbon fiber prepreg), which can not only position the annular preform, but also ensure that the co-cured preform is fully compressed. The core mold adopts a split structure, and demoulding is simple. The positioning tool is fixedly connected to the molding mold, which is both a molding mold and a gluing tool. One mold has two uses, saving costs.

[0057] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A ribbed composite cabin forming mold, characterized in that: include: The male mold comprises a small end flange (16), a large end flange (17) and a core mold with one end larger than the other end, the two ends of the core mold being locked by the small end flange (16) and the large end flange (17) respectively, and the core mold comprises a middle core mold (15) and a plurality of outer core molds connected to the outer periphery of the middle core mold (15); The female mold comprises a positioning tool, 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 contour surface, so as to accommodate the cabin skin (1) laid by the male mold; the positioning tool is detachably connected in the receiving cavity, and the positioning tool is used to install reinforcing ribs; when the positioning tool is connected in the receiving cavity, the reinforcing ribs on the positioning tool and the cabin skin (1) are fitted.

2. The ribbed composite cabin body forming mold according to claim 1, characterized in that: The positioning tool comprises an annular reinforcement rib positioning tool (28) for installing the annular reinforcement rib (3) and a longitudinal reinforcement rib positioning tool (29) for installing the longitudinal reinforcement rib (2); The annular reinforcing rib positioning tool (28) and the longitudinal reinforcing rib positioning tool (29) are both mounted on a positioning tool connecting rod (210), and the positioning tool connecting rod (210) is detachably connected to the base (23).

3. The ribbed composite cabin forming mold according to claim 2, characterized in that: The longitudinal reinforcing rib positioning tool (29) comprises a longitudinal reinforcing rib positioning plate, wherein the longitudinal reinforcing rib positioning plate is provided with a long slot hole along the height direction; The screws (211) penetrate the long slotted holes to mount the longitudinal reinforcing rib positioning plate on the base (23).

4. The ribbed composite cabin forming mold according to claim 1, characterized in that: It also includes an annular preform positioning member (30) that is adapted to the shape of the core mold contour surface; The annular preform positioning piece (30) comprises an outer end surface (301) and an inner end surface (302) which are connected to each other, and the hardness of the outer end surface (301) is smaller than the hardness of the inner end surface (302).

5. The ribbed composite cabin forming mold according to claim 1, characterized in that: The mold body comprises a mold body 1 (21) and a mold body 2 (22), wherein the mold body 1 (21) and the mold body 2 (22) are connected to a base (23) via bolts, and the mold body 1 (21) and the mold body 2 (22) are connected to each other via bolts, and a receiving cavity is formed between the mold body 1 (21), the mold body 2 (22) and the base (23).

6. The ribbed composite cabin body forming mold according to claim 5, characterized in that: The female mold further comprises a plurality of positioning blocks, which are evenly distributed at the end of the accommodating cavity and are used to position the annular preform positioning piece (30).

7. The ribbed composite cabin forming mold according to claim 1, characterized in that: The outer core mold comprises 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), the right core mold (12), the lower core mold (13) and the left core mold (14) are respectively connected to the periphery of the middle core mold (15) and are connected via wedge blocks.

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

9. A method for forming a ribbed composite cabin, characterized in that: Using the molding die according to any one of claims 1 to 8, the method comprises: Placing the male mold on a support frame, rotating the male mold and laying the composite material to form a cabin skin (1); The small end flange (16) and the large end flange (17) are removed from the core mold, the middle core mold (15) is pulled out from the large end, and then the plurality of outer core molds are moved toward the middle and pulled out from the large end; Transferring and attaching the cabin skin (1) to the receiving cavity of the female mold; Installing the positioning fixture into the accommodating cavity, so that the reinforcing ribs on the positioning fixture and the cabin skin (1) are in contact with each other, and the reinforcing ribs and the cabin skin (1) are co-glued and cured to form a ribbed composite cabin; The positioning fixture and the mold body on the base (23) are removed, and the ribbed composite cabin body is taken out.

10. The method for forming a ribbed composite cabin according to claim 9, characterized in that: After the stiffener and the cabin skin (1) are glued together and cured, the method further includes: Installing the annular preform positioning member (30) into the annular preform (4); Connecting the annular preform positioning piece (30) to the cabin skin (1), and providing an annular preform positioning group at the end of the accommodating cavity to position the annular preform positioning piece (30); The annular preform positioning piece (30) having the annular preform (4) and the cabin skin (1) are cured.

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