Carbon fiber support arm mold and use method thereof

Abstract

The invention relates to a carbon fiber support arm mold which comprises a support arm mold main body and a flange forming auxiliary mold matched with the support arm mold main body, a support arm mold main body cavity is formed between the support arm mold main body and the flange forming auxiliary mold, and the flange forming auxiliary mold uniformly applies pressure to the support arm mold main body cavity in a vacuum pressure applying mode; a mold limit matched with the flange forming auxiliary mold is arranged at the bottom of the support arm mold main body, and after the mold limit is attached to the flange forming auxiliary mold, a gap meeting the thickness of the support arm flange is formed between the flange forming auxiliary mold and the support arm mold main body. During use, the support arm mold main body and the flange forming auxiliary mold are matched with each other to form a support arm flange mold cavity, and the mold molded surface of the flange forming auxiliary mold can form uniform and effective pressure on the surface of a product under the action of vacuumizing, so that the defect that the product is locally rich in resin or upwarps due to non-uniform local stress is prevented; and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship components, in particular to a carbon fiber support arm mold and a use method thereof, and in particular to a carbon fiber support arm mold for an air cushion vehicle aerodynamic device and a use method thereof. Background Art

[0002] A hovercraft is a high-speed ship that uses the principle of surface effect to form an air cushion between the hull and the supporting surface (ground or water surface) by relying on air with a pressure higher than atmospheric pressure, so that the hull can sail completely or partially away from the supporting surface. The duct is an important aerodynamic propulsion device of the hovercraft, which consists of a cylinder, a support arm and a fairing. The support arm is a component that connects the cylinder and the fairing. There are outward-folded connecting flanges at both ends of the support arm. One end of the flange is connected to the cylinder, and the other end of the flange is connected to the fairing.

[0003] In the prior art, carbon fiber materials are usually used to make the support arms. Carbon fiber materials have the advantages of light weight, high strength, corrosion resistance, good fatigue performance, etc., and are ideal materials for manufacturing hovercraft support arms. Carbon fiber support arms are often formed by vacuum infusion of carbon fiber fabric layers. In order to ensure the precise aerodynamic shape of the support arm components, the outer side of the support arm is often used as the mold surface and the inner side is used as the film surface. In this structure, the bonding surface of the support arm connection flange is the film surface. Since the vacuum bag film is a soft material, the flange bonding surface is prone to defects such as rich resin, warping, and excessive thickness, which affects assembly.

[0004] Therefore, there is an urgent need for a support arm mold that can produce a defect-free, high-quality support arm mold and an improved preparation method. Summary of the invention

[0005] The purpose of the present invention is to provide an improved carbon fiber arm mold and a method for using the same. By improving the structure and process methods, the defects of the arm flange such as resin-rich, warping or excessive thickness during the molding process are solved, thereby improving product quality and production efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a carbon fiber arm mold, characterized in that: the arm mold includes an arm mold main body and a flange forming auxiliary mold matching therewith, an arm mold main body cavity is formed between the arm mold main body and the flange forming auxiliary mold, and the flange forming auxiliary mold applies uniform pressure to the arm mold main body cavity by vacuum pressure; a mold limiter matching the flange forming auxiliary mold is provided at the bottom of the arm mold main body, and after the mold limiter is fitted with the flange forming auxiliary mold, a gap that meets the thickness of the arm flange is formed between the flange forming auxiliary mold and the arm mold main body.

[0007] Preferably, the flange forming auxiliary mold is arc-shaped, with an arc at the head and tail respectively, and the flange forming auxiliary mold is provided with 2-3 rows of exhaust holes at the end of the corresponding arm flange, the diameter of the exhaust holes is 1-2mm, the radius of the head arc is 15-20mm, and the radius of the tail arc is 20-25mm.

[0008] Furthermore, the exhaust holes are opened along the length direction of the flange, the exhaust holes are spaced 20 to 30 mm apart in the length direction of the flange, and the distance interval in the height direction of each row of exhaust holes is 3 to 5 mm.

[0009] Furthermore, a mold exhaust system is provided on the outer side of the flange forming auxiliary mold, and breathable cotton is laid on one end of the exhaust hole. The breathable cotton is connected to the exhaust system through an exhaust spiral tube.

[0010] A method for using a carbon fiber arm mold, which is used to make a carbon fiber arm, characterized in that: the carbon fiber arm includes an arm plane part and an arm flange part connected to the arm plane part, and the method for using includes the following steps: a, sequentially laying a continuous felt, a breathable cloth, a demoulding cloth under a structural layer, an arm carbon fiber cloth layer and a demoulding cloth on a structural layer in the main body of the arm mold; b, installing a flange to form an auxiliary mold and laying a guide net, so that the guide net and the flange forming auxiliary mold form an overlapping part; c, pasting a VAP film at the exhaust hole of the flange forming auxiliary mold, the flange forming auxiliary mold conflicts with the mold limiting structure, so that the mold surface of the flange forming auxiliary mold is installed in place; d, laying breathable cotton close to the outside of the exhaust hole, and laying an exhaust spiral tube matched with the breathable cotton, and connecting the exhaust spiral tube to the exhaust system; e, sleeve a vacuum bag film on the outside of the exhaust system and the flange forming auxiliary mold; f, sealing and vacuuming, then pouring resin under vacuum conditions, and finally curing and demoulding to form a carbon fiber arm.

[0011] Preferably, in step a, a continuous felt is laid in the main body of the arm mold, and the continuous felt has a gram weight of 300-450g / m 2 One end of the continuous felt extends to the plane part of the arm, exceeding the end of the flange forming auxiliary mold by 10-20mm, and the other end extends to the flange part of the arm, with a distance of 10-20mm from the top exhaust hole; then the polytetrafluoroethylene breathable cloth is laid, and the two ends of the breathable cloth extend beyond the two ends of the continuous felt by 20-30mm respectively; the lower demoulding cloth of the structural layer is laid, and the lower demoulding cloth of the structural layer extends beyond the polytetrafluoroethylene breathable cloth by 20-30mm on the side of the plane part of the arm, and exceeds the end face of the flange auxiliary molding mold of the arm by 30-50mm on the side of the flange part of the arm; the upper demoulding cloth of the structural layer is laid, and the upper demoulding cloth of the structural layer is fully spread on the plane part of the arm, and exceeds the end face of the flange auxiliary molding mold of the arm by 30-50mm on the side of the flange part of the arm.

[0012] Furthermore, in step b, the overlap portion between the guide net and the flange forming auxiliary mold is 10-20 mm.

[0013] Furthermore, in step d, the breathable cotton covers all the exhaust holes and exceeds the lowest and highest exhaust holes by 50-100 mm. The exhaust spiral tube cooperates with the breathable cotton and is laid at the middle and lower exhaust holes.

[0014] Furthermore, in step f, during the sealing vacuum process, when the vacuum value drops to -60 kPa, the vacuum system is turned off to check whether the flange forming auxiliary mold is in contact with the demolding cloth on the structural layer. If so, continue to evacuate the system to -99 kPa. Under the vacuum pressure, the mold surface of the flange forming auxiliary mold evenly applies pressure to the main cavity of the arm mold to avoid molding defects.

[0015] Furthermore, in step f, during the vacuum infusion process, the resin front first flows along the guide net to infiltrate the dry carbon fiber cloth layer of the support arm. When the resin reaches the flange forming auxiliary mold, the resin front changes to flow along the continuous felt, and the air in the cavity is discharged through the exhaust holes and is extracted by the exhaust system through the breathable cotton and the exhaust spiral tube, ensuring that after the flange forming auxiliary mold is installed, the carbon fiber cloth layer of the support arm can still be completely infiltrated with resin.

[0016] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0017] 1. In the improved solution of the present invention, a cavity of the main arm mold is formed between the main arm mold and the flange forming auxiliary mold, and the flange forming auxiliary mold uniformly presses the cavity of the main arm mold by vacuum pressure, thereby preventing defects such as local resin-rich or warping of the product caused by uneven local force, thereby improving product quality;

[0018] 2. In the technical solution of the present invention, the flange forming auxiliary mold is provided with 2-3 rows of exhaust holes at the end of the corresponding support arm flange, and a mold exhaust system is provided on the outside of the flange forming auxiliary mold. One end of the exhaust hole is provided with breathable cotton, and the breathable cotton is connected to the exhaust system through an exhaust spiral tube. After vacuuming, the resin is poured into the carbon fiber cloth layer of the support arm for a long time, thereby ensuring the effect of the pouring and improving the quality of the finished product.

[0019] 3. In the method of use of the present invention, continuous felt, breathable cloth, demoulding cloth under the structural layer, carbon fiber cloth layer of the arm and demoulding cloth on the structural layer are sequentially laid in the main body of the support arm mold; the flange is installed to form an auxiliary mold and a guide net is laid, so that the guide net and the flange forming auxiliary mold form an overlapping part. The continuous felt and the guide net are matched to avoid the formation of infusion envelopment, ensure the guide performance of the resin, and help the resin flow, so as not to form semi-dry yarn or dry yarn defects, and not cause indentation, which affects the aerodynamic appearance, and ensures the cost appearance quality;

[0020] 4. The mold structure of the present invention is simple and easy to operate, which can effectively improve the quality of the support arm products, while improving work efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of defects in support molding in the prior art.

[0022] Figure 2 It is a structural schematic diagram of an embodiment of the present invention.

[0023] Figure 3 The figure is a schematic diagram of the structure of the support arm mold according to an embodiment of the present invention.

[0024] Figure 4 It is a partial enlarged view of the flange forming auxiliary mold of the present invention.

[0025] Figure 5 It is a schematic diagram of the partially enlarged structure of the support arm mold body and the mold limiter of the present invention.

[0026] Reference numerals:

[0027] 100 arms;

[0028] 110 arm plane portion;

[0029] 120 arm flange part;

[0030] 130 The looseness of the fabric layer of the arm flange caused the defect of excessive thickness;

[0031] 140 Resin-rich defects on the surface of the arm flange;

[0032] 150 The edge of the arm flange is warped;

[0033] 200 flange forming auxiliary mold;

[0034] 210 air extraction hole;

[0035] 211 first arc;

[0036] 212 tail arc;

[0037] 220VAP membrane;

[0038] 230 breathable cotton;

[0039] 240 suction spiral tube;

[0040] 300 arm mold body

[0041] 310 mold limit;

[0042] 410 continuous felt;

[0043] 420 PTFE breathable cloth;

[0044] 430 structural layer lower release cloth

[0045] 440 release cloth on the structural layer;

[0046] 450 mold exhaust system;

[0047] 460 diversion net;

[0048] 470 The continuous felt is located on the side of the support arm plane portion and exceeds the flange forming auxiliary mold;

[0049] 480 The overlap part between the guide net and the flange forming auxiliary mold;

[0050] 500 vacuum bag film. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The present invention provides a carbon fiber arm mold, see Figure 2 The difference between the present invention and the prior art lies in that: the arm mold comprises an arm mold main body 300 and a flange forming auxiliary mold 200 matched therewith, an arm mold main body cavity is formed between the arm mold main body and the flange forming auxiliary mold, and the flange forming auxiliary mold uniformly pressurizes the arm mold main body cavity by vacuum pressure; a mold limiter 310 matched with the flange forming auxiliary mold is provided at the bottom of the arm mold main body, and after the mold limiter is fitted with the flange forming auxiliary mold, a gap that meets the thickness of the arm flange is formed between the flange forming auxiliary mold and the arm mold main body.

[0053] When in use, the arm flange mold cavity is formed by the cooperation between the arm mold main body and the flange forming auxiliary mold. The mold surface of the flange forming auxiliary mold will form uniform and effective pressure on the product surface under the action of vacuum, preventing defects such as local resin-rich or warping of the product caused by local uneven force, thereby improving product quality.

[0054] Example 1

[0055] In this embodiment, the support arm mold includes an arm mold main body 300 and a flange forming auxiliary mold 200 matched therewith. An arm mold main body cavity is formed between the arm mold main body and the flange forming auxiliary mold. The flange forming auxiliary mold applies uniform pressure to the arm mold main body cavity through vacuum pressure. A mold limiter 310 matched with the flange forming auxiliary mold is provided at the bottom of the arm mold main body. After the mold limiter is fitted with the flange forming auxiliary mold, a gap that matches the thickness of the arm flange is formed between the flange forming auxiliary mold and the arm mold main body.

[0056] Specifically, the arm mold body is provided with an arc surface, and the flange forming auxiliary mold is also provided with an arc surface matching therewith. The flange forming auxiliary mold is in an arc shape, with an arc at the head and tail, and the outer side is rounded. At the same time, a relatively gentle angle is provided to prevent the vacuum bag film 500 from being tight and causing stress concentration problems. The inner radius of the head arc 211 (i.e., the side facing the product) is 15-20mm, and the radius of the tail arc is 20-25mm.

[0057] Furthermore, the exhaust holes are opened along the length direction of the flange, and the exhaust holes are spaced 20 to 30 mm in the length direction of the flange, and the distance interval between each row of exhaust holes in the height direction is 3-5 mm. The exhaust holes are arranged along the height direction of the flange, and the interval between each row of exhaust holes is 10-20 mm. A mold exhaust system 450 is provided on the outside of the flange forming auxiliary mold, and breathable cotton is laid at one end of the exhaust hole, and the breathable cotton is connected to the exhaust system through an exhaust spiral tube. During implementation, the breathable cotton connects all the exhaust holes into a whole, and the exhaust spiral tube is connected to the vacuum system. Under the action of vacuum, the residual air in the flange cloth layer can be discharged through the exhaust holes on the auxiliary mold, and at the same time, an exhaust force is provided toward the top of the flange to help the resin on the continuous felt flow upward and infiltrate the entire support arm carbon fiber cloth layer. The mold exhaust system described here is a prior art, and its specific structure and working principle will not be repeated here.

[0058] Example 2

[0059] This embodiment introduces a method for using a mold. The method is used to make a carbon fiber support arm. The carbon fiber support arm includes a support arm plane portion and a support arm flange portion connected to the support arm plane portion. The method includes the following steps: a. laying a continuous felt 410, a breathable cloth 420, a lower mold release cloth 430 of a structural layer, a support arm carbon fiber cloth layer and an upper mold release cloth 440 of a structural layer in sequence in the support arm mold body; b. installing a flange to form an auxiliary mold and laying a guide net 460 so that the guide net and the flange forming auxiliary mold form an overlap portion 480; c. A VAP film 220 is attached to the exhaust hole of the flange forming auxiliary mold, and the flange forming auxiliary mold conflicts with the mold limiting structure, so that the mold surface of the flange forming auxiliary mold is installed in place; d. Breathable cotton 230 is laid against the outside of the exhaust hole, and an exhaust spiral tube 240 matched with the breathable cotton is laid, and the exhaust spiral tube is connected to the exhaust system; e. A vacuum bag film 500 is set on the outside of the exhaust system and the flange forming auxiliary mold; f. The vacuum is sealed, and then the resin is poured under vacuum conditions, and finally cured and demolded to form a carbon fiber arm. The VAP film here uses a one-way breathable film of model VAP-115 produced by Zhejiang Youwei.

[0060] Specifically, in step a, a continuous felt is laid in the main body of the arm mold, and the continuous felt weighs 300-450g / m 2 , one end of the continuous felt extends to the plane part of the arm, 10-20mm beyond the end of the flange forming auxiliary mold, and the other end extends to the flange part of the arm, 10-20mm away from the top exhaust hole; then lay the polytetrafluoroethylene breathable cloth, and the two ends of the breathable cloth exceed the two ends of the continuous felt by 20-30mm respectively; lay the lower demoulding cloth of the structural layer, the lower demoulding cloth of the structural layer exceeds the polytetrafluoroethylene breathable cloth by 20-30mm on the side of the plane part of the arm, and exceeds the end face of the auxiliary forming mold of the flange of the arm by 30-50mm on the side of the flange part of the arm; lay the upper demoulding cloth of the structural layer, the upper demoulding cloth of the structural layer is fully laid on the plane part of the arm, and exceeds the end face of the auxiliary forming mold of the flange of the arm by 30-50mm on the side of the flange part of the arm. The carbon fiber cloth layer of the arm here is produced by Guangwei Composites, and the model is KWC400 and KBC400 multi-axial warp knitted fabric.

[0061] Furthermore, in step b, the overlap portion between the guide net and the flange forming auxiliary mold is 10-20 mm.

[0062] Furthermore, in step d, the breathable cotton covers all the exhaust holes and exceeds the lowest and highest exhaust holes by 50-100 mm. The exhaust spiral tube cooperates with the breathable cotton and is laid at the middle and lower exhaust holes.

[0063] Furthermore, in step f, during the sealing vacuum process, when the vacuum value drops to -60kpa, the vacuum system is turned off to check whether the flange forming auxiliary mold is in contact with the demoulding cloth on the structural layer. If it is, continue to evacuate to -99kpa. Under vacuum pressure, the mold surface of the flange forming auxiliary mold evenly applies pressure to the main cavity of the arm mold to avoid molding defects. In step f, during the vacuum infusion process, the resin front first flows along the guide net to infiltrate the dry arm carbon fiber cloth layer. When the resin reaches the flange forming auxiliary mold, the resin front changes to flow along the continuous felt, and the air in the cavity is discharged through the exhaust hole and is extracted by the exhaust system through the breathable cotton and the exhaust spiral tube to ensure that the arm carbon fiber cloth layer can still be completely infiltrated with resin after the flange forming auxiliary mold is installed. Specifically, the epoxy resin model 2511A / 2511BM produced by Shangwei New Materials is used. The curing system here is to heat at 50℃ and keep it for 2.5h, then heat at 75℃ and keep it for 5h, and then demould after cooling to 40℃.

[0064] Example 3

[0065] In this embodiment, the support arm mold includes a support arm mold main body and a flange forming auxiliary mold matching therewith. An arm mold main body cavity is formed between the support arm mold main body and the flange forming auxiliary mold. The flange forming auxiliary mold applies uniform pressure to the support arm mold main body cavity through vacuum pressure. A mold limiter matching the flange forming auxiliary mold is provided at the bottom of the support arm mold main body. After the mold limiter is fitted with the flange forming auxiliary mold, a gap that matches the thickness of the arm flange is formed between the flange forming auxiliary mold and the support arm mold main body.

[0066] During processing, first lay a continuous felt on the mold surface, and the position of the continuous felt corresponds to the flange forming auxiliary mold. The continuous felt has good flow conductivity and can help the resin flow. At the same time, choose a continuous felt with a moderate weight, preferably 400g / m 2 It can not only ensure a better flow guidance effect, but also not easily cause indentations and affect the aerodynamic shape.

[0067] Then, vacuum sealing operation is performed. During the vacuum sealing process, when the vacuum value drops to -60kpa, the vacuum system is turned off, and the flange forming auxiliary mold 200 is checked to fit the release cloth 440 on the structural layer. Vacuuming is continued to -99kpa. Under vacuum pressure, the flange forming auxiliary mold 200 applies pressure evenly to the arm flange 120 to avoid defects such as loose arm flange cloth layer causing excessive thickness 130, arm flange surface rich in resin 140, and arm flange edge warping 150.

[0068] Then, the infusion is performed. During the vacuum infusion process, the resin front first flows along the guide net 460 to infiltrate the dry carbon fiber cloth layer. When the resin reaches the flange forming auxiliary mold 200, the resin front changes to flow along the continuous felt 410. The air in the system is discharged through the exhaust hole 210 and is extracted through the breathable cotton 230 and the exhaust spiral tube 240 to ensure that after the flange forming auxiliary mold 200 is installed, the carbon fiber cloth layer of the support arm can still be completely infiltrated with resin. Specifically, breathable cotton and exhaust spiral tubes are laid on the outside of the exhaust holes on the flange mold. The breathable cotton connects all the exhaust holes into a whole, and the exhaust spiral tube is connected to the vacuum system. Under the action of vacuum, the residual air in the carbon fiber cloth layer of the support arm can be discharged through the exhaust holes on the auxiliary mold, and at the same time, a suction force is provided toward the top of the flange to help the resin on the continuous felt flow upward and infiltrate the entire carbon fiber cloth layer of the support arm.

[0069] A VAP film (one-way breathable film) 220 is attached to the inner side of the air extraction hole 210. The VAP film is a semi-permeable polymer film that can prevent liquid resin from passing through while being breathable, ensuring that resin cannot enter the air extraction hole 210 while air is discharged through the air extraction hole 210, thereby preventing the air extraction hole 210 from being blocked by resin. After the arm product is cured and demoulded, the flange forming auxiliary mold only needs basic cleaning and can be quickly used for the production of the next product.

[0070] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A carbon fiber arm mold, characterized in that: The support arm mold includes an arm mold main body and a flange forming auxiliary mold matching therewith. An arm mold main body cavity is formed between the arm mold main body and the flange forming auxiliary mold. The flange forming auxiliary mold applies uniform pressure to the arm mold main body cavity through vacuum pressure. A mold limiter matching the flange forming auxiliary mold is provided at the bottom of the arm mold main body. After the mold limiter is fitted with the flange forming auxiliary mold, a gap that matches the thickness of the arm flange is formed between the flange forming auxiliary mold and the arm mold main body.

2. A carbon fiber arm mold according to claim 1, characterized in that: The flange forming auxiliary mold is arc-shaped, with an arc at the head and tail respectively. The flange forming auxiliary mold is provided with 2-3 rows of exhaust holes at the end of the corresponding arm flange, and the diameter of the exhaust holes is 1-2mm; the radius of the head arc is 15-20mm, and the radius of the tail arc is 20-25mm.

3. A carbon fiber arm mold according to claim 2, characterized in that: The exhaust holes are opened along the length direction of the flange, the exhaust holes are spaced 20-30 mm apart in the length direction of the flange, and the distance interval in the height direction of each row of exhaust holes is 3-5 mm.

4. The carbon fiber arm mold according to claim 2, characterized in that: A mold exhaust system is arranged on the outer side of the flange forming auxiliary mold, and breathable cotton is laid on one end of the exhaust hole, and the breathable cotton is connected to the exhaust system through an exhaust spiral pipe.

5. The method for using a carbon fiber support arm mold according to claim 1 is used to make a carbon fiber support arm, characterized in that: The carbon fiber support arm comprises a support arm plane part and a support arm flange part connected to the support arm plane part, and the use method comprises the following steps: a. laying a continuous felt, a breathable cloth, a demoulding cloth under the structural layer, a support arm carbon fiber cloth layer and a demoulding cloth on the structural layer in sequence in the support arm mold body; b. installing a flange to form an auxiliary mold and laying a guide net so that the guide net and the flange forming auxiliary mold form an overlapping part; c. pasting a VAP film at the exhaust hole of the flange forming auxiliary mold, the flange forming auxiliary mold conflicts with the mold limiting structure, so that the mold surface of the flange forming auxiliary mold is installed in place; d. laying breathable cotton close to the outside of the exhaust hole, and laying an exhaust spiral tube matched with the breathable cotton, and connecting the exhaust spiral tube to the exhaust system; e. sleeve a vacuum bag film on the outside of the exhaust system and the flange forming auxiliary mold; f. Seal and evacuate, then infuse resin under vacuum conditions, and finally cure and demould to form a carbon fiber support arm.

6. The method for using the carbon fiber support arm mold according to claim 5, characterized in that: In step a, a continuous felt is laid in the main body of the arm mold, and the continuous felt has a gram weight of 300-450g / m 2 One end of the continuous felt extends to the plane part of the support arm, 10-20mm beyond the end of the flange forming auxiliary mold, and the other end extends to the flange part of the support arm, 10-20mm away from the top exhaust hole; then lay the polytetrafluoroethylene breathable cloth, and the two ends of the breathable cloth extend 20-30mm beyond the two ends of the continuous felt respectively; Lay the lower release cloth of the structural layer, which protrudes 20-30mm from the polytetrafluoroethylene breathable cloth on the side of the support arm plane and 30-50mm from the end face of the support arm flange auxiliary molding mold on the side of the support arm flange; lay the upper release cloth of the structural layer, which fully spreads on the support arm plane and protrudes 30-50mm from the end face of the support arm flange auxiliary molding mold on the side of the support arm flange.

7. The method for using the carbon fiber support arm mold according to claim 5, characterized in that: In step b, the overlap portion between the guide net and the flange forming auxiliary mold is 10-20 mm.

8. The method for using the carbon fiber support arm mold according to claim 5, characterized in that: In step d, the breathable cotton covers all the exhaust holes and exceeds the lowest and highest exhaust holes by 50-100 mm. The exhaust spiral pipe cooperates with the breathable cotton and is laid at the middle and lower exhaust holes.

9. The method for using the carbon fiber support arm mold according to claim 5, characterized in that: In step f, during the sealing vacuum process, when the vacuum value drops to -60kpa, turn off the vacuum system and check whether the flange forming auxiliary mold is in contact with the demolding cloth on the structural layer. If so, continue to evacuate the system to -99kpa. Under the vacuum pressure, the mold surface of the flange forming auxiliary mold evenly applies pressure to the main cavity of the arm mold to avoid molding defects.

10. The method for using the carbon fiber support arm mold according to claim 5, characterized in that: In step f, during the vacuum infusion process, the resin front first flows along the guide net to infiltrate the dry carbon fiber cloth layer of the support arm. When the resin reaches the flange forming auxiliary mold, the resin front changes to flow along the continuous felt, and the air in the cavity is discharged through the exhaust holes and is extracted by the exhaust system through the breathable cotton and the exhaust spiral tube, ensuring that after the flange forming auxiliary mold is installed, the carbon fiber cloth layer of the support arm can still be completely infiltrated with resin.

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