An air vent grille for a rail vehicle and a forming method thereof

Abstract

An air vent grille for a rail vehicle and its forming method, which relates to the technical field of rail vehicles, includes an outer frame connected to the vehicle body, a load-bearing skeleton connected to the outer frame, an inner blade and an outer blade connected to the load-bearing skeleton. An inner load-bearing ring for connecting the inner blade and an outer load-bearing ring for connecting the outer blade are provided on the load-bearing skeleton. The outer load-bearing ring is arranged above the inner load-bearing ring. V-shaped air guiding parts and strip-shaped ventilation holes are formed on both the inner blade and the outer blade. The opening directions of the V-shaped air guiding parts of the inner blade are opposite to those of the V-shaped air guiding parts of the outer blade. The total thickness of the outer frame is 2-4 mm, the total thickness of the inner blade is 1-4 mm, and the total thickness of the outer blade is 2-4 mm. The overall structure of the present invention has good characteristics such as stiffness, fatigue resistance, impact resistance, and strong heat dissipation. Moreover, the forming method is simple, not easy to deform, has good size control, low cost, and wide application.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and particularly to a ventilation grille for rail vehicles and a forming method thereof. Background Art

[0002] In recent years, the country has vigorously developed the rail transit industry. The market demand for various component products of rail vehicles has become increasingly strong. With the development of rail vehicle manufacturing technology, the demand for vehicle body lightweighting has become more and more urgent. As a new type of lightweight and high-strength material, composite materials have high strength and high modulus, and at the same time have corrosion resistance, fatigue resistance, and high fatigue performance, which can effectively reduce weight and meet the lightweighting requirements.

[0003] The existing ventilation grille for rail vehicles is located on the skirt board of the equipment compartment under the side wall of the vehicle body. The product has a certain curved arc. At present, the ventilation grille is mainly made of aluminum alloy materials, so it is difficult to form, and the product is prone to deformation and unstable dimensions during the manufacturing process.

[0004] Therefore, it is necessary to design a ventilation grille for rail vehicles and a forming method thereof to improve the above problems. Summary of the Invention

[0005] Aiming at the above problems in the prior art, the present invention provides a ventilation grille for rail vehicles and a forming method thereof, which can effectively reduce weight, and the ventilation grille has good stiffness, fatigue resistance, impact resistance, strong heat dissipation and other characteristics.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A ventilation grille for rail vehicles includes an outer frame connected to the vehicle body, a load-bearing skeleton connected to the outer frame, an inner blade and an outer blade connected to the load-bearing skeleton. The load-bearing skeleton is provided with an inner load-bearing ring for connecting the inner blade and an outer load-bearing ring for connecting the outer blade. The outer load-bearing ring is arranged above the inner load-bearing ring. V-shaped air guiding parts and strip-shaped ventilation holes are formed on both the inner blade and the outer blade. The opening directions of the V-shaped air guiding parts of the inner blade are opposite to the opening directions of the V-shaped air guiding parts of the outer blade. The total thickness of the outer frame is 2-4 mm, the total thickness of the inner blade is 1-4 mm, and the total thickness of the outer blade is 2-4 mm.

[0008] Preferably, the V-shaped air guiding parts and the ventilation holes are arranged adjacent to each other.

[0009] Preferably, both the inner load-bearing ring and the outer load-bearing ring are provided with clamping parts matching the V-shaped air guiding parts.

[0010] Preferably, the outer frame is made of carbon fiber and / or glass fiber reinforced resin matrix composite material.

[0011] Preferably, the load-bearing framework is made of a material in which a fiber-reinforced resin matrix composite wraps a foam inner core and is filled with expandable microspheres.

[0012] Preferably, the outer layer of the outer blade is made of an aramid fiber-reinforced resin matrix composite, and the inner layer is made of a carbon fiber and / or glass fiber-reinforced resin matrix composite.

[0013] Preferably, the inner blade is made of a carbon fiber and / or glass fiber-reinforced resin matrix composite.

[0014] Preferably, the outer frame, the load-bearing framework, the inner blade, and the outer blade are stacked in sequence and fixed with a film, and are cured by heating and pressurization.

[0015] Preferably, during curing, the temperature is 120 - 140 °C, the curing time is 120 - 240 min, and the curing pressure is 0.1 - 0.3 MPa.

[0016] A forming method for an air grille of a rail vehicle includes the following steps:

[0017] Step 1: Fabricate the load-bearing framework, which is made of a material in which a fiber-reinforced resin matrix composite wraps a foam inner core and is filled with expandable microspheres.

[0018] Step 2: Fabricate the outer frame. Lay and compact a carbon fiber and / or glass fiber-reinforced resin matrix composite on the surface layer of the outer frame mold; lay a film on the inner surface of the uncured outer frame, then place the load-bearing framework prepared in Step 1 on the film, and cure by heating and pressurization to obtain the main structure of the air grille.

[0019] Step 3: Fabricate the outer blade. Lay the outer layer on the surface of the outer blade mold, the outer layer being an aramid fiber-reinforced resin matrix composite, and lay the inner layer, the inner layer being a carbon fiber and / or glass fiber-reinforced resin matrix composite, and cure by heating and pressurization to form.

[0020] Step 4: Fabricate the inner blade. Lay a carbon fiber and / or glass fiber-reinforced resin matrix composite on the upper layer of the inner blade mold, and cure by heating and pressurization to form.

[0021] Step 5: Lay a film on the connection surfaces of the load-bearing framework with the inner blade and the outer blade, fix the inner blade and the outer blade, cure by heating and pressurization, and trim to obtain the air grille structure.

[0022] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. For the air grille of a rail vehicle of the present invention, the overall structure has good characteristics such as stiffness, fatigue resistance, impact resistance, and strong heat dissipation;

[0024] 2. A ventilation grille for a rail vehicle according to the present invention is formed by composite materials, and the weight of the entire ventilation grille can be reduced by about 35%.

[0025] 3. A ventilation grille for a rail vehicle according to the present invention can resist the impact of flying objects such as sand and gravel (the vertical critical breakdown speed is 100 m / s), and can withstand the pneumatic load requirements of ±7850 Pa.

[0026] 4. A ventilation grille for a rail vehicle according to the present invention can be alternately used within the temperature range of -50°C to +70°C, has good fatigue resistance, and the vibration fatigue life ≥ 10 7 times;

[0027] 5. A ventilation grille for a rail vehicle according to the present invention has a simple forming method, is not easily deformed, has good dimensional control, low cost, and wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By referring to the following description in conjunction with the drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the drawings:

[0029] Figure 1 is a front view of the structure of the ventilation grille provided by an embodiment of the present invention;

[0030] Figure 2 is Figure 1 the sectional view taken along line A - A in

[0031] Figure 3 is Figure 2 the partial enlarged view of part B in

[0032] Figure 4 is Figure 1 the sectional view taken along line C - C in

[0033] Figure 5 is a side view of the structure of the ventilation grille provided by an embodiment of the present invention;

[0034] Figure 6 is an axonometric view of the outer frame of the structure of the ventilation grille provided by an embodiment of the present invention;

[0035] Figure 7 is an axonometric view of the load-bearing skeleton of the structure of the ventilation grille provided by an embodiment of the present invention;

[0036] Figure 8 is an axonometric view of the inner blades of the structure of the ventilation grille provided by an embodiment of the present invention;

[0037] Figure 9 is an axonometric view of the outer blades of the structure of the ventilation grille provided by an embodiment of the present invention;

[0038] The reference numerals therein include: outer frame 1, load-bearing framework 2, inner blade 3, outer blade 4, V-shaped air guiding part 5, strip-shaped ventilation holes 6, inner load-bearing ring 21, outer load-bearing ring 22, and clamping part 23. Specific embodiments

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present invention.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. It should be pointed out that all the accompanying drawings are exemplary representations. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention will be further described in detail below through specific examples in combination with the accompanying drawings.

[0043] Refer to Figures 1 to 9, An air vent grille for rail vehicles, comprising an outer frame 1 connected to the vehicle body, a load-bearing skeleton 2 connected to the outer frame 1, an inner blade 3 and an outer blade 4 connected to the load-bearing skeleton 2. The outer frame 1, the load-bearing skeleton 2, the inner blade 3 and the outer blade 4 are stacked in sequence and fixed with a film, and formed by curing under heating and pressure. During curing, the temperature is 120 - 140 °C, the curing time is 120 - 240 min, and the curing pressure is 0.1 - 0.3 MPa. The total thickness of the outer frame 1 is 2 - 4 mm, the total thickness of the inner blade 3 is 1 - 4 mm, and the total thickness of the outer blade 4 is 2 - 4 mm. This structure can improve the overall stiffness of the air vent grille, can withstand the pneumatic load requirement of ±7850 Pa, and can meet the use requirements under the operating condition of the maximum wind speed of 33 m / s.

[0044] Refer to Figure 6 , The outer frame 1 is made of carbon fiber and / or glass fiber reinforced resin matrix composite material. For example, carbon fiber prepreg is laid on the outer frame mold, and after laying, compaction treatment is carried out. Flanges are formed around the outer frame 1 to facilitate molding and installation. The outer frame 1 can also be an outer frame made of aluminum alloy.

[0045] Refer to Figure 3 and Figure 7 , The load-bearing skeleton 2 is made of a material in which a fiber-reinforced resin matrix composite material coats a foam inner core and fills expandable foaming microspheres. The volume density of the foam inner core is 80 - 200 kg / m 3 , the glass transition temperature ≥140 °C, and the density of the expandable foaming microspheres can be reduced from 1100 kg / m 3 to 100 kg / m 3 . An inner load-bearing ring 21 for connecting the inner blade 3 and an outer load-bearing ring 22 for connecting the outer blade 4 are provided on the load-bearing skeleton 2. The outer load-bearing ring 22 is arranged above the inner load-bearing ring 21. Clamping parts 23 matching the V-shaped air guiding part 5 are provided on both the inner load-bearing ring 21 and the outer load-bearing ring 22.

[0046] Refer to Figure 4 , Figure 8 , Figure 9 , The inner blade 3 is made of carbon fiber and / or glass fiber reinforced resin matrix composite material; the outer layer of the outer blade 4 is made of aramid fiber reinforced resin matrix composite material, and the inner layer is made of carbon fiber and / or glass fiber reinforced resin matrix composite material. The areal density of the aramid fiber woven fabric is 100 - 300 g / m 2, the total thickness of the outer blade is 2-4 mm, and the thickness of the outer layer is 0.2-0.6 mm. V-shaped air guiding parts 5 and strip-shaped ventilation holes 6 are formed on both the inner blade 3 and the outer blade 4. The opening directions of the V-shaped air guiding parts 5 of the inner blade 3 are opposite to those of the V-shaped air guiding parts 5 of the outer blade 4. The V-shaped air guiding parts 5 and the ventilation holes 6 are arranged adjacent to each other. Since there is a gap between the inner blade 3 and the outer blade 4, when external air flows inward, it first flows through the V-shaped air guiding parts 5 of the outer blade 4, and then flows through the strip-shaped ventilation holes 6 of the outer blade 4 to the V-shaped air guiding parts 5 of the inner blade 3. After being guided by the V-shaped air guiding parts 5 of the inner blade 3 and the V-shaped air guiding parts 5 of the outer blade 4, it finally flows inward through the strip-shaped ventilation holes 6 of the inner blade 3.

[0047] A forming method for a ventilation grille of a rail vehicle, comprising the following steps:

[0048] Step 1: Manufacture a load-bearing skeleton 2, which is made of a material in which a fiber-reinforced resin matrix composite wraps a foam inner core and fills expandable foamed microspheres; lay a surface layer prepreg on the surface of the load-bearing skeleton mold, compact and cure to obtain a surface layer. The areal density of the surface layer prepreg is preferably 100-300 g. Vacuum bag curing or autoclave curing can be used during curing, and autoclave curing is preferred. Process the foam core material according to the design structure of the load-bearing skeleton 2, lay a layer on the outer surface of the foam core material with a fiber-reinforced resin matrix prepreg, and cure after laying to obtain the load-bearing skeleton 2. Selective layer-by-layer curing can improve the overall mechanical properties of the load-bearing skeleton 2.

[0049] Step 2: Manufacture an outer frame 1, lay carbon fiber and / or glass fiber-reinforced resin matrix composite materials on the surface layer of the outer frame mold and compact; lay a layer of adhesive film on the inner surface of the uncured outer frame 1, then place the load-bearing skeleton 2 prepared in Step 1 on the adhesive film, and cure by heating and pressurizing to obtain the main structure of the ventilation grille.

[0050] Step 3: Manufacture an outer blade 4, lay an outer layer on the surface of the outer blade mold, the outer layer is an aramid fiber-reinforced resin matrix composite material, lay a layer of adhesive film on the inner surface of the uncured outer layer of the outer blade 4, lay an inner layer, the inner layer is a carbon fiber and / or glass fiber-reinforced resin matrix composite material, and cure by heating and pressurizing to form.

[0051] Step 4: Manufacture an inner blade 3, lay a carbon fiber and / or glass fiber-reinforced resin matrix composite material on the upper layer of the inner blade mold, and cure by heating and pressurizing to form.

[0052] Step Five: Lay a layer of adhesive film on the connecting surfaces of the load-bearing framework 2 with the inner blades 3 and the outer blades 4, fix the inner blades 3 and the outer blades 4, cure by heating and pressurization, and trim to obtain the ventilation grille structure; when curing, the temperature is preferably 120 - 140°C, the curing time is preferably 120 - 240 min, the curing pressure is 0.1 - 0.3 MPa. After curing, keep the pressure and cool down to below 50°C, and keep evacuating during the cooling process.

[0053] In the embodiment of the present invention, the outer frame 1 and the load-bearing framework 2 are preferably integrally formed, and the inner blades 3 and the outer blades 4 are formed separately, and are connected and fixed to the load-bearing framework using an epoxy adhesive film, and formed by heating and pressurization.

[0054] In other alternative embodiments, the outer frame 1, the outer blades 4 and the inner blades 3 can also be fixed to the load-bearing framework 2 by fasteners such as screws and rivets to improve the service life of the ventilation grille.

[0055] In the embodiment of the present invention, the resin matrix used is all epoxy resin; the adhesive films are all epoxy adhesive films cured at 120 - 140°C, the lap shear strength of the epoxy adhesive film is ≥30 MPa (23°C), and the thickness of the epoxy adhesive film is 0.2 - 0.4 mm. The resin matrix of each composite material is preferably an epoxy resin matrix, more preferably the Zhejiang Baihe Aerospace BAC488 resin system, to meet the requirements for fire resistance, aging resistance, impact toughness performance, etc. In other alternative embodiments, it can also be a phenolic resin matrix, a benzoxazine resin matrix, a vinyl resin matrix, etc.

[0056] In an alternative embodiment, the foam core material of the load-bearing framework 2 is preferably PMI, and it can also be PET, PI, EVA. The above foams can further reduce the weight while ensuring the stiffness.

[0057] In the embodiment of the present invention, the carbon fiber is preferably T300 or T700 grade carbon fiber with a surface density of 200 - 400 g / m 2 plain weave / twill weave, and the glass fiber is preferably plain weave, twill weave or satin weave with a surface density of 100 - 600 g / m 2 ; the aramid fiber is selected as plain weave, twill weave or satin weave fabric with a surface density of 200 - 300 g / m 2 .

[0058] The following is a specific embodiment of the present invention. All kinds of raw materials, reagents, instruments and equipment used in the present invention can be obtained through market purchase or can be prepared by existing methods.

[0059] The embodiment of the present invention provides a ventilation grille structure for a train car body with a speed of 450 km / h. As Figure 1 shown, the overall dimensions of the ventilation grille structure are 750×500 mm, the cross-section is arc-shaped, and the forming steps of the ventilation grille are as follows:

[0060] Step 1: According to the design dimensions of the ventilation grille structure, manufacture the foam core material of the load-bearing skeleton 2. The foam core material can be made in sections. The foam core material uses PMI foam with a volume density of 100 kg / m 3 ;

[0061] Step 2: Use a halogen-free flame-retardant epoxy resin prepreg with a areal density of 200 g / m 2 . The curing conditions of the load-bearing skeleton 2 are curing at 0.1 - 0.3 MPa and 130 °C for 4 h.

[0062] Step 3: Prepare the outer frame 1. Lay a carbon fiber prepreg with a areal density of 200 g / m 2 on the outer frame mold. The number of plies is 10 layers. After laying, perform a compaction treatment to control the total thickness of the subsequent obtained outer frame 1 to be 2 mm.

[0063] Step 4: Use a medium-temperature curing adhesive film J-69 purchased from Heilongjiang Petrochemical Research Institute Co., Ltd. to paste on the outer frame 1 prepared in Step 3. The areal density of the adhesive film is 320 g / m 2 .

[0064] Step 5: Fix the load-bearing skeleton 2 on the rubber mold, seal it with a vacuum bag, and put it into a autoclave. During curing, the temperature is 130 °C, the curing time is preferably 4 h, and the curing pressure is 0.2 MPa. After curing, keep the pressure and cool down to below 50 °C. During the cooling process, keep vacuum pumping.

[0065] Step 6: Prepare the outer blade 4. Lay an aramid plain weave fabric prepreg with a areal density of 200 g / m 2 on the outer blade mold. The number of plies is 2 layers. Then lay a carbon fiber unidirectional prepreg with the same resin system and a areal density of 200 g / m 2 . The number of plies is 8 layers. After laying, perform a compaction treatment to control the total thickness of the subsequent obtained cured outer blade 4 to be 2 mm. Put it into a autoclave. During curing, the temperature is 130 °C, the curing time is preferably 4 h, and the curing pressure is 0.3 MPa. After curing, keep the pressure and cool down to below 50 °C. During the cooling process, keep vacuum pumping.

[0066] Step 7: Prepare the inner blade 3. Lay a carbon fiber unidirectional prepreg with a areal density of 200 g / m 2 on it. The number of plies is 10 layers. After laying, perform a compaction treatment to control the total thickness of the subsequent obtained cured inner blade 3 to be 2 mm. Put it into a autoclave. During curing, the temperature is 130 °C, the curing time is preferably 4 h, and the curing pressure is 0.3 MPa. After curing, keep the pressure and cool down to below 50 °C. During the cooling process, keep vacuum pumping.

[0067] Step 8: Lay a layer of rubber mold on the connection surfaces of the load-bearing framework 2 with the inner blades 3 and the outer blades 4, fix the inner blades 3 and the outer blades 4, and cure them by heating and pressurization.

[0068] Step 9: Grind and process the circumferential bars according to the dimensional requirements and remove the excess residual glue to obtain the ventilation grille structure.

[0069] The outer frame 1, the load-bearing framework 2, the inner blades 3, and the outer blades 4 all adopt the same halogen-free flame-retardant epoxy resin system, and the performance of the obtained composite material meets the HL2 level of the EN45545 standard. The tensile strength of the carbon fiber reinforced resin matrix composite material is 920 MPa, the tensile modulus is 60 GPa, the shear strength is 110 MPa, and the shear modulus is 4 GPa; the tensile strength of the foam is 1.12 MPa, and the tensile modulus is 42.6 MPa. The thickness of the ventilation grille for the train with a speed of 450 km / h provided in this embodiment is 2 mm.

[0070] Test the high and low temperature performance, mechanical performance, fire performance, etc. of the ventilation grille. The test results are as follows:

[0071] According to the high and low temperature test requirements specified in GB / T17748-2008, within the range of -50 to 80 °C, cycle more than 50 times, and the product can withstand the pneumatic load requirement of ±7850 Pa. It meets the use requirements under the operating conditions of the train with a speed of 450 km / h and a maximum wind speed of 33 m / s, and can withstand 10 7 times of vibration fatigue tests. Conduct a fire test according to EN45545, and it can meet the fire protection requirements of the HL2 level.

[0072] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air vent grille for a rail vehicle, characterized in that, It includes an outer frame connected to the vehicle body, a load-bearing skeleton connected to the outer frame, an inner blade and an outer blade connected to the load-bearing skeleton. An inner load-bearing ring for connecting the inner blade and an outer load-bearing ring for connecting the outer blade are provided on the load-bearing skeleton. The outer load-bearing ring is arranged above the inner load-bearing ring. V-shaped air guiding parts and strip-shaped ventilation holes are formed on both the inner blade and the outer blade. The opening directions of the V-shaped air guiding parts of the inner blade are opposite to those of the V-shaped air guiding parts of the outer blade. The total thickness of the outer frame is 2-4 mm, the total thickness of the inner blade is 1-4 mm, and the total thickness of the outer blade is 2-4 mm.

2. The air vent grille for a rail vehicle according to claim 1, characterized in that, The V-shaped air guiding part and the ventilation hole are arranged adjacent to each other.

3. The air vent grille for a rail vehicle according to claim 1, characterized in that, Clamping parts matching the V-shaped air guiding parts are provided on both the inner load-bearing ring and the outer load-bearing ring.

4. The air vent grille for a rail vehicle according to claim 1, characterized in that, The outer frame is made of carbon fiber and / or glass fiber reinforced resin matrix composite material.

5. The air vent grille for a rail vehicle according to claim 1, characterized in that, The load-bearing skeleton is made of a material in which a fiber reinforced resin matrix composite material coats a foam inner core and fills expandable microspheres.

6. The air vent grille for a rail vehicle according to claim 1, characterized in that, The outer layer of the outer blade is made of an aramid fiber reinforced resin matrix composite material, and the inner layer is made of carbon fiber and / or glass fiber reinforced resin matrix composite material.

7. The air vent grille for a rail vehicle according to claim 1, characterized in that, The inner blade is made of carbon fiber and / or glass fiber reinforced resin matrix composite material.

8. The air vent grille for a rail vehicle according to claim 1, characterized in that, The outer frame, the load-bearing skeleton, the inner blade and the outer blade are stacked in sequence and fixed with a glue film, and are cured by heating and pressurization.

9. The air vent grille for a rail vehicle according to claim 8, characterized in that, During curing, the temperature is 120-140 °C, the curing time is 120-240 min, and the curing pressure is 0.1-0.3 MPa.

10. A forming method for an air vent grille of a rail vehicle, characterized in that, It includes the following steps: Step 1: Manufacture the load-bearing skeleton, which is made of a material in which a fiber reinforced resin matrix composite material coats a foam inner core and fills expandable microspheres; Step 2: Manufacture the outer frame. Lay carbon fiber and / or glass fiber reinforced resin matrix composite material on the surface layer of the outer frame mold and compact it; lay a layer of glue film on the inner surface of the uncured outer frame, then place the load-bearing skeleton prepared in Step 1 on the glue film, and cure it by heating and pressurization to obtain the main structure of the ventilation grille; Step 3: Manufacture the outer blade. Lay the outer layer, which is an aramid fiber reinforced resin matrix composite material, and lay the inner layer, which is carbon fiber and / or glass fiber reinforced resin matrix composite material, on the surface of the outer blade mold, and cure it by heating and pressurization; Step 4: Manufacture the inner blade. Lay carbon fiber and / or glass fiber reinforced resin matrix composite material on the upper layer of the inner blade mold, and cure it by heating and pressurization; Step 5: Lay a layer of glue mold on the connection surfaces of the load-bearing skeleton with the inner blade and the outer blade, fix the inner blade and the outer blade, cure it by heating and pressurization, and trim it to obtain the ventilation grille structure.

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