A co-curing method of a double curvature laminate structure winglet

Abstract

The application discloses a co-curing forming method of a double-curvature laminated plate structure wing tip winglet, and belongs to the technical field of aircraft winglet manufacturing. The co-curing forming method comprises the following steps: firstly, a soft silicon rubber mold suitable for an inner surface of a product is designed, the soft silicon rubber mold is divided into three parts, and prepreg laying is carried out on the three parts respectively; then, after copper mesh is laid on a lower die of a product metal forming mold, lower skin layers are continuously laid according to a layer design sequence; the soft silicon rubber mold is placed on the lower skin layers, and then upper skin layers are laid on the soft silicon rubber mold; after copper mesh is laid on an upper die of the product metal forming mold, the upper die is placed on the upper skin layers, and mold closing is carried out; finally, curing forming and mold stripping are carried out to obtain the product. The forming method has simple procedures and is easy to operate, is optimized from a conventional autoclave process into a low-cost curing furnace forming process, and greatly reduces manufacturing cost; and the prepared soft silicon rubber mold can be repeatedly used, and the use of adhesive and rivets is cancelled, thereby saving a large amount of labor cost and mold cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite material manufacturing, in particular to a co-curing forming method of a double curvature laminated plate structure wing tip winglet. BACKGROUND

[0002] The wing tip winglet is an additional structure at the end of the wing of a civil aircraft, and is stably connected with the wing through a root center joint. The design can significantly interfere with the airflow in the wing tip area, thereby effectively reducing the induced drag in the high-speed flight state of the aircraft. For most transport aircraft, the induced drag accounts for about 40% of the total drag during flight. Therefore, the application of the wing tip winglet not only helps to save fuel consumption, but also shows significant economic benefits in reducing the operating cost of the aircraft.

[0003] In recent years, under the background of pursuing higher performance and higher efficiency, the aviation industry has increasingly urgent demands for lightweight, high-strength and low-cost structures. Under this premise, more and more wing tip winglets begin to adopt laminated plate structures. The skin, beam and rib in the structure cooperate with each other, which can effectively enhance the overall stiffness and improve the stability and anti-deformation ability of the wing tip winglet.

[0004] The common forming method of the wing tip winglet of the laminated structure is hot press tank forming, including two methods of secondary bonding and co-bonding. The secondary bonding refers to bonding two or more cured composite parts together by using adhesive, and the adhesive is cured during the bonding process to realize the connection of the parts. The advantage is that it can connect parts of different shapes and sizes, has high connection strength and reliability, and the disadvantage is that the process is relatively complex, and the parts need to be accurately processed and positioned to ensure the bonding quality. Co-bonding refers to bonding one or more cured parts with one or more uncured prepregs together and curing, and during the curing process, the resin in the prepreg reacts chemically to form a firm connection with the cured parts. The advantage is that it can realize one-step forming, reduce the process and assembly time, and improve the production efficiency. The disadvantage is that the process control requirement is relatively high, and the curing temperature, pressure and time parameters need to be accurately controlled to ensure the bonding quality and structural performance. In addition, during the secondary bonding and co-bonding process, although the use of rivets simplifies the assembly process, the weight of the rivets and the influence on the structural strength cannot be ignored. Therefore, although the laminated plate structure has significant advantages in weight reduction and stiffness improvement, it still faces many challenges in the forming process, including: (1) the hot press tank process is expensive; (2) the assembly positioning process is complex, resulting in relatively low production efficiency; (3) the use of adhesive can provide good connection effect, but its weight and curing time limit its application in lightweight design; (4) the use of rivets simplifies the assembly process, but its own weight and influence on structural strength cannot be ignored; (5) the number of molds is large and there is high precision assembly requirement, and the mold manufacturing cost is high. SUMMARY

[0005] In view of the problems in the above background art, the present application designs a co-curing forming method for a double curvature laminated plate structure wing tip winglet, which is only applicable to a laminated plate wing tip winglet without ribs, and is designed by using a non-hot press tank co-curing manufacturing technology, combined with a large size, high precision and double curvature combined mold tooling design, thereby providing a low-cost, lightweight manufacturing technology, a simplified manufacturing process and a quality controllable co-curing forming method.

[0006] To achieve the above invention purposes, the present application provides the following technical solutions:

[0007] A co-curing forming method for a double curvature laminated plate structure wing tip winglet, comprising the following steps:

[0008] (1) Silicone rubber soft mold design and laying design: design a silicone rubber soft mold suitable for the inner surface of the product according to the product structure, and then divide it into three parts according to the product forming mold cavity requirements, and lay the prepreg in each part;

[0009] The first layer of the two parts of the silicone rubber soft mold is made of glass fiber prepreg, and then several layers of carbon fiber prepreg are laid according to the layer design sequence, and the number of layers is greater than or equal to 1;

[0010] The uppermost layer of the silicone rubber soft mold is first laid with a layer of glass fiber prepreg, which has an assembly relationship with the metal connecting rib (i.e. the connecting piece between the wing), and then several layers of carbon fiber prepreg are laid according to the layer design sequence, and the number of layers is greater than or equal to 1;

[0011] The layer design sequence is repeated with a laying angle of ±45, 0 / 90;

[0012] (2) Lower mold laying design of product metal forming mold: after laying a layer of copper mesh on the lower mold of the product metal forming mold, several layers of carbon fiber prepreg are laid on top according to the layer design sequence, and the laying of the remaining lower skin layers is completed;

[0013] The layer design sequence is repeated with a laying angle of ±45, 0 / 90;

[0014] (3) Assembly of silicone rubber soft mold and product metal forming mold: place the structure in step (1) with the lower part of the silicone rubber soft mold as the bottom on the layers in step (2), and use the large end cover plate in the product metal forming mold and the silicone rubber positioning screw tooling to position and assemble the silicone rubber soft mold, then continue to lay the remaining upper skin layers on top of the silicone rubber soft mold according to the layer design;

[0015] The upper skin layer is laid in sequence with several layers of carbon fiber prepreg laid in sequence with a laying angle of 0 / 90, ±45, and the layers of carbon fiber prepreg laid on top of the silicone rubber soft mold are symmetrically designed;

[0016] When the silicone rubber soft mold is placed in the middle of the product metal forming mold, the left and right ends of the silicone rubber soft mold are respectively attached to the large end cover plate and the small end cover plate of the product metal forming mold;

[0017] (4) Upper mold laying design and mold closing of product metal forming mold: after laying a layer of copper mesh on the upper mold of the product metal forming mold, place the structure on the upper skin layer in step (3) and close the mold;

[0018] (5) Curing and forming: place the forming mold and product obtained in step (4) together in a curing oven for curing and forming; during the heating process of the curing oven, the silicone rubber expands under heat to pressurize the product;

[0019] The curing temperature is 120-180℃, and the curing time is 1-3h;

[0020] (6) demolding: after the solidification forming is finished, the front baffle of the product metal forming mold is first disassembled, and then the silicone rubber soft mold is directly pulled out, since the silicone rubber has certain elasticity, the metal upper mold is disassembled, and the double curvature laminated plate structure wing tip wing of the application is obtained; the demolding process is simple and easy to operate, and a large amount of labor cost is saved;

[0021] The silicone rubber soft mold and the product metal forming mold are matched with the product shape structure, and the product metal forming mold is of double curvature.

[0022] Further, in steps (2) and (3) of the application, the front edge needs to consider staggered floor design to avoid weak connection of the product at the same place, the splicing seam spacing is generally >=25mm, and the splicing mode has lap joint and butt joint two kinds, which can be determined according to actual requirements; the lap joint width is generally 12.5-25.4mm, and the splicing gap is <=1.5mm.

[0023] Further, the carbon fiber prepreg of the application has a fiber area weight of 100-400g / m 2 , and the resin content is 30%-50%; the glass fiber prepreg has a fiber area weight of 50-100g / m 2 , and the resin content is 40%-80%.

[0024] Further, the outermost layer of the wing tip wing of the application is a lightning protection surface film, and the area weight is 100-400g / m 2 ; the inner layer of the assembly surface of the wing tip wing connected with the metal connecting rib (i.e. the connecting piece between the wing) is a glass fiber prepreg with smaller area weight.

[0025] Further, the laying number of layers of the carbon fiber prepreg in each part and the prepreg parameters are designed according to the load bearing, thickness and weight requirements of the wing tip wing, the amount of each layer of prepreg is determined according to the product area, and the increase of ±45° laying layer can improve the shear performance of the product.

[0026] The wing tip wing of the application adopts a co-curing forming process, which needs to use three different types of molds, namely a silicone rubber forming metal mold, a silicone rubber soft mold and a product forming metal mold. In the curing process, the silicone rubber mold can provide the necessary forming pressure after being heated and expanded, and the product forming metal mold is responsible for ensuring the size and precision of the product outer shape.

[0027] Further, the soft silicone rubber mold of the present application is formed by normal temperature curing using a silicone rubber forming metal mold, and the structure of the silicone rubber forming metal mold comprises a left mold, a right mold, two partition plates, a large end plate, a small end plate and a support frame; wherein the left mold and the right mold are connected by the large end plate and the small end plate respectively, the two partition plates are perpendicular to the large and small end plates and are arranged between the two end plates; the left mold and the right mold are arranged on the support frame, and the left mold, the right mold, the large end plate and the small end plate are all provided with sealing grooves, and the partition plates are positioned with the left and right molds by positioning grooves.

[0028] Since the silicone rubber male mold is formed by normal temperature curing, the material of the silicone rubber forming metal mold is aluminum alloy, and the left and right molds, the large end plate and the small end plate are designed with sealing grooves to prevent the silicone rubber from flowing out of the mold before curing, and the partition plates are positioned with the left and right molds by positioning grooves.

[0029] Further, the product forming metal mold structure of the present application comprises an upper mold, a lower mold, a large end cover plate, a small end cover plate, an insert, a silicone rubber positioning screw, a mold closing block and a guide column; wherein the upper mold and the lower mold are connected by the large end cover plate and the small end cover plate respectively, the upper mold and the lower mold are positioned and closed by the mold closing block and the guide column, the insert is arranged between the upper and lower molds, and the silicone rubber positioning screw is located on the large end cover plate; the silicone rubber positioning screw adopts an M24 internal hexagonal screw.

[0030] The upper and lower molds are used to ensure the overall size of the winglet, and the upper and lower molds are mainly positioned by the mold closing block and the guide column when the molds are closed, and the M24 internal hexagonal screw is used for locking. The winglet size is large and the shape is double curvature. In order to reduce the weight of the mold and ensure the strength of the mold, reinforcing ribs are designed on the back of the mold.

[0031] In the present application, since the forming temperature of the winglet is 120-180℃, in order to improve the forming precision of the product, the expansion deformation of the mold under high temperature needs to be considered, so the mold cavity is designed to be smaller, and the expansion size is calculated according to formula (1):

[0032]

[0033] In the formula: △L is the expansion size, L is the product size, and ε is the metal linear expansion coefficient.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] (1) The forming method of the present application optimizes the conventional hot press tank process to a low-cost curing oven forming process, which greatly reduces the manufacturing cost.

[0036] (2) The forming method of the present application is simple and easy to operate, and the silicone rubber soft mold can be reused many times, which saves a lot of labor cost and mold cost.

[0037] (3) The forming method of the present application cancels the use of adhesive and rivets, providing a prerequisite for lightweight design.

[0038] (4) The forming method of the present application provides effective forming pressure and profile guarantee for the co-curing design of the wing tip winglet of the laminated plate soft and hard combined die, and the measured value of the product meets the requirements of ≤2% porosity, the value deviation meets the requirements of ±0.75mm, and the internal single defect area meets the requirements of ≤100mm 2 . BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 The wing tip winglet structure of the present application is shown in the figure.

[0040] Fig. 2 The structure of the silicone rubber forming die and the A-A cross section of the present application are shown in the figure.

[0041] Fig. 3 The structure of the silicone rubber soft die after forming of the present application is shown in the figure.

[0042] Fig. 4 The front view of the product forming metal die structure of the present application is shown in the figure.

[0043] Fig. 5 The right view of the product forming metal die structure of the present application is shown in the figure.

[0044] Fig. 6 The structure of the product forming metal die of the present application is shown in the figure.

[0045] Figs. 1-6 Each mark is: 1 large end plate, 2 left die, 3 support frame, 4 small end plate, 5 right die, 6 partition plate,

[0046] 7 positioning groove, 8 large end cover plate, 9 small end cover plate, 10 upper die, 11 silicone rubber positioning screw, 12 lower die,

[0047] 13 insert, 14 die block, 15 guide pillar. DETAILED DESCRIPTION

[0048] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings.

[0049] The wing tip winglet of the present application adopts a co-curing forming process, which requires the use of three different types of dies, namely a silicone rubber forming metal die, a silicone rubber soft die and a product forming metal die. In the curing process, the silicone rubber die can provide the necessary forming pressure after being heated and expanded, and the product forming metal die is responsible for ensuring the size and precision of the product outer profile.

[0050] The silicon rubber soft mold is formed by normal temperature curing using a silicon rubber forming metal mold, and the silicon rubber forming metal mold structure comprises a left mold 2, a right mold 5, two partition plates 6, a large end plate 1, a small end plate 4 and a support frame 3; wherein the left mold 2 and the right mold 5 are connected and installed by the large end plate 1 and the small end plate 4 respectively, the two partition plates are parallel to the large and small end plates and are arranged between the two end plates; the left mold and the right mold are arranged on the support frame, and the left mold, the right mold, the large end plate and the small end plate are all provided with sealing grooves, and the partition plates are positioned with the left and right molds through positioning grooves 7.

[0051] Since the silicon rubber male mold is formed by normal temperature curing, the material of the silicon rubber forming metal mold is aluminum alloy, the left and right molds, the large end plate and the small end plate are designed with sealing grooves to prevent the silicon rubber from flowing out of the mold before curing, and the partition plates are positioned with the left and right molds through positioning grooves.

[0052] The product forming metal mold structure comprises an upper mold 10, a lower mold 12, a large end cover plate 8, a small end cover plate 8, an insert 13, a silicon rubber positioning screw 11, a mold closing block 14 and a guide column 15; wherein the upper mold and the lower mold are connected and installed by the large end cover plate and the small end cover plate respectively, the upper mold and the lower mold are positioned and closed by the mold closing block and the guide column, the insert is arranged between the upper and lower molds, and the silicon rubber positioning screw is located on the large end cover plate; the silicon rubber positioning screw adopts an M24 internal hexagonal screw.

[0053] The upper and lower molds are used to ensure the overall size of the winglet, and the upper and lower molds are mainly positioned by the mold closing block and the guide column when the upper and lower molds are closed, and the M24 internal hexagonal screw is used for locking. The winglet size is large and the shape is double curvature. In order to reduce the weight of the mold and ensure the strength of the mold, reinforcing ribs are designed on the back of the mold.

[0054] A co-curing forming method of a double curvature laminated plate structure wing tip winglet, comprising the following steps:

[0055] (1) Silicon rubber soft mold design and laying design: design a silicon rubber soft mold suitable for the inner surface of the product according to the product structure, and then divide it into three parts according to the product forming mold cavity requirements, and lay and paste the pre-impregnated material of each part respectively;

[0056] The first layer of the lower two parts of the silicon rubber soft mold is 14#, and the laying design order is 13#-8#;

[0057] The uppermost layer of the silicon rubber soft mold is first laid and pasted with 14#, which has an assembly relationship with the metal connecting rib (i.e. the connecting piece between the wing), and then laid and pasted according to the laying design order 13#-8#;

[0058] The silicone rubber mold design refers to the specification of HB Z 245-1993, the forming pressure is all greater than or equal to 0.4 MPa, the use requirements are met, and the design of each mold cavity volume and stress theoretical calculation results are shown in Table 1;

[0059] Table 1 shows the stress theoretical calculation results of each mold cavity

[0060]

[0061] (2) The lower mold of the product metal forming mold is laid out: a layer of 1# is laid on the lower mold of the product metal forming mold, and then 2#-7# is continuously laid according to the design order of the layers, so as to complete the laying of the remaining lower skin layers;

[0062] (3) Assembly of the silicone rubber soft mold and the product metal forming mold: the structure in step (1) is placed on the layers in step (2) with the lower part of the silicone rubber soft mold as the bottom, and the silicone rubber soft mold is positioned and assembled by using the large end cover plate in the product metal forming mold and the silicone rubber positioning screw tooling, and then the remaining upper skin layers 7#-2# are continuously laid on the silicone rubber soft mold according to the design of the layers;

[0063] When the silicone rubber soft mold is placed in the middle of the product metal forming mold, the two ends thereof are respectively attached to the large end cover plate and the small end cover plate of the product metal forming mold;

[0064] (4) Upper mold laying design and mold closing of the product metal forming mold: after laying a layer of 1# on the upper mold of the product metal forming mold, the structure is placed on the upper skin layers in step (3) for mold closing;

[0065] (5) Curing forming: the forming mold and the product obtained in step (4) are placed in a curing oven for curing forming; during the heating process of the curing oven, the silicone rubber expands under the heat to pressurize the product;

[0066] The curing temperature is 120-180 DEG C, and the curing time is 1-3 h;

[0067] (6) Demolding: after the curing forming is completed, the front baffle of the product metal forming mold is first disassembled, and then the silicone rubber soft mold is directly pulled out; since the silicone rubber has a certain elasticity, the metal upper mold is disassembled to obtain the double curvature laminated plate structure wing tip wing of the application; the demolding process is simple and easy to operate, and a large amount of labor cost is saved;

[0068] The silicone rubber soft mold and the product metal forming mold are matched with the shape and structure of the product, and the shape of the product metal forming mold is double curvature;

[0069] The structural layer design of the application is to select specific prepreg parameters and layer numbers according to the load, thickness and weight requirements of the wing tip winglet, and the layers are generally symmetrically laid, and the increase of ±45° layers can improve the shear performance of the product, and the typical overall structural layer design is shown in Table 1.

[0070] Table 2 Typical overall layer design

[0071]

[0072]

[0073] In steps (2) and (3) of the application, the front edge needs to consider staggered layer design to avoid weak connection of the product at the same place, and the splicing gap is generally ≥25mm, and the splicing method has lap joint and butt joint, which can be determined according to actual requirements; the lap joint width is generally 12.5-25.4mm, and the splicing gap is ≤1.5mm.

[0074] The carbon fiber prepreg of the application has a fiber area weight of 100-400g / m 2 , and the resin content is 30%-50%; the glass fiber prepreg has a fiber area weight of 50-100g / m 2 , and the resin content is 40%-80%.

[0075] The outermost layer of the wing tip winglet of the application is a lightning protection surface film, and the area weight is 100-400g / m 2 ; the inner layer of the assembly surface of the wing tip winglet connected with the metal connecting rib (i.e. the connecting piece between the wing) is a glass fiber prepreg with smaller area weight.

[0076] The carbon fiber prepreg of the application has a fiber area weight of 100-400g / m 2 ; the inner layer of the assembly surface of the wing tip winglet connected with the metal connecting rib (i.e. the connecting piece between the wing) is a glass fiber prepreg with smaller area weight.

[0077] In the application, the forming temperature of the wing tip winglet is 120-180℃, in order to improve the forming precision of the product, the expansion deformation of the mold under high temperature needs to be considered, so the mold cavity is designed to be smaller, and the expansion size is calculated according to formula (1):

[0078]

[0079] In the formula: △L is the expansion size, L is the product size, and ε is the metal wire expansion coefficient.

[0080] The present application is a co-curing forming method for a rib-free laminate winglet, which is designed by using a non-heat autoclave co-curing manufacturing technology, combined with a large-size, high-precision and double-curvature combined mold tooling design, thereby providing a low-cost, lightweight manufacturing technology, a simplified manufacturing process and a quality controllable co-curing forming method.

Claims

1. A co-curing molding method of a double curvature laminated structure wing tip winglet, characterized by, It comprises the following steps: (1) The design and paving of the soft silicone rubber mold: a soft silicone rubber mold is designed according to the product structure and is adapted to the inner surface of the product, and then the mold is divided into three parts according to the requirements of the product forming mold cavity, and each part is separately paved with prepreg; The first layer of the lower two parts of the soft silicone rubber mold is glass fiber prepreg, and then several layers of carbon fiber prepreg are paved according to the paving design sequence, with the number of layers being greater than or equal to 1; The uppermost layer of the soft silicone rubber mold is first paved with a layer of glass fiber prepreg, which has an assembly relationship with the metal connecting rib, and then several layers of carbon fiber prepreg are paved according to the paving design sequence, with the number of layers being greater than or equal to 1; (2) The lower mold paving design of the product metal forming mold: after paving a layer of copper mesh on the lower mold of the product metal forming mold, several layers of carbon fiber prepreg are continued to be paved on the upper layer according to the paving design sequence, and the paving of the remaining lower skin layers is completed; The product metal forming mold is matched with the shape and structure of the product, and the outer shape is double curvature; it mainly comprises an upper mold, a lower mold, a large end cover plate and a small end cover plate, and the upper mold and the lower mold are respectively installed and connected through the large end cover plate and the small end cover plate; The paving design sequence of steps (1) and (2) is repeated paving with a paving angle of ±45, 0 / 90; (3) Assembly of the soft silicone rubber mold and the product metal forming mold: the structure of step (1) is placed on the upper layer of step (2) with the lower part of the soft silicone rubber mold as the bottom, and then the remaining upper skin layers are continued to be paved on the upper layer of the soft silicone rubber mold according to the paving design; When the soft silicone rubber mold is placed in the middle of the product metal forming mold, the left and right ends of the mold are respectively fitted with the large end cover plate and the small end cover plate of the product metal forming mold; The upper skin layer is paved with several layers of carbon fiber prepreg according to the paving angle of 0 / 90, ±45, and the layers of carbon fiber prepreg paved on the upper layer of the soft silicone rubber mold are symmetrically designed; (4) The upper mold paving design of the product metal forming mold and the mold closing: after paving a layer of copper mesh on the upper mold of the product metal forming mold, the structure is placed on the upper skin layer of step (3) for mold closing; (5) Curing forming: the forming mold and the product obtained in step (4) are placed in a curing oven for curing forming; (6) Demolding: after the curing forming is completed, the front stop plate of the product metal forming mold is first removed, then the soft silicone rubber mold is directly pulled out, and the metal upper mold is removed to obtain the double curvature laminated plate structure wing tip winglet; The soft silicone rubber mold is obtained by curing forming at room temperature using a silicone rubber forming metal mold; The structure of the silicone rubber forming metal mold comprises a left mold (2), a right mold (5), two partition plates (6), a large end plate (1), a small end plate (4) and a support frame (3), wherein the left mold (2) and the right mold (5) are installed and connected through the large end plate (1) and the small end plate (4) respectively, the two partition plates (6) are perpendicular to the large and small end plates and are placed between the two end plates; The left mold (2) and the right mold (5) are placed on the support frame (3), and the left mold, the right mold, the large end plate and the small end plate are all provided with sealing grooves, and the partition plates are positioned with the left and right molds through positioning grooves (7); The material of the silicone rubber forming metal mold is aluminum alloy; The product forming metal mold cavity is smaller than the product size.

2. A co-curing forming method of a double curvature laminated structure wing tip winglet according to claim 1, characterized in that, The carbon fiber prepreg has a fiber area weight of 100-400 g / m 2 The glass fiber prepreg has a fiber area weight of 50-100 g / m 2 The wing tip winglet outermost layer is a lightning protection surface film having an area weight of 100-400 g / m 2 .

3. A co-curing forming method of a double curvature laminated structure wing tip winglet according to claim 2, characterized in that, The curing temperature in step (5) is 120-180 DEG C, and the curing time is 1-3 hours.

4. A co-curing forming method of a double curvature laminated structure wing tip winglet according to claim 3, characterized in that, In step (3), the structure in step (1) is placed on the lay-up in step (2) using staggered layer design, and the splicing mode is in the form of lap joint or butt joint, the lap joint width is 12.5-25.4 mm, and the splicing gap is ≤1.5 mm.

5. A co-curing molding method of a double curvature laminated structure wing tip winglet according to claim 3, characterized in that, The laying layer number and the pre-impregnated material parameters of each part are designed according to the load, thickness and weight requirements of the wing tip winglet, and the pre-impregnated material usage is determined according to the product area.

6. A co-curing forming method of a double curvature laminated structure wing tip winglet according to claim 3, characterized in that, The product forming metal mold structure specifically comprises an upper mold (10), a lower mold (12), a large end cover plate (8), a small end cover plate (9), an insert (13), a silicone rubber positioning screw (11), a mold closing block (14) and a guide column (15). The upper mold and the lower mold are respectively installed and connected through the large end cover plate and the small end cover plate, the upper mold and the lower mold are positioned and closed through the mold closing block and the guide column, the insert is arranged between the upper mold and the lower mold, and the silicone rubber positioning screw is arranged on the large end cover plate.

7. A co-curing forming method of a double curvature laminated structure wing tip winglet according to claim 6, characterized in that, When the silicone rubber soft mold is arranged in the product metal forming mold, it is positioned and assembled through the large end cover plate and the silicone rubber positioning screw tooling.

8. A co-curing molding method of a double curvature laminated structure wing tip winglet according to claim 6, characterized in that, The product forming metal mold back is also provided with a reinforcing rib.

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