CN110654039B - Manufacturing method of non-equal-diameter closed square tubular carbon fiber beam of unmanned aerial vehicle - Google Patents
Manufacturing method of non-equal-diameter closed square tubular carbon fiber beam of unmanned aerial vehicle Download PDFInfo
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- CN110654039B CN110654039B CN201910779289.4A CN201910779289A CN110654039B CN 110654039 B CN110654039 B CN 110654039B CN 201910779289 A CN201910779289 A CN 201910779289A CN 110654039 B CN110654039 B CN 110654039B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0003—Producing profiled members, e.g. beams
- B29D99/0007—Producing profiled members, e.g. beams having a variable cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
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Abstract
In order to effectively solve the technical problems of narrow application range, difficult demoulding, low yield of air bag core films, short service life, complex flow and higher cost of the existing manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam of the unmanned aerial vehicle, the invention provides a manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam of the unmanned aerial vehicle, which comprises the following steps: 1) processing an upper female die and a lower female die; step 2) processing an upper beam by using the upper female die; step 3) processing a lower beam by using the lower female die; step 4), gluing the upper beam and the lower beam by using a gluing and folding tool; and 5) removing the cementing and folding tool to obtain the required non-equal-diameter closed square tubular carbon fiber beam. The integral member is divided into two parts to be formed independently, compared with integral forming, the requirements on a forming process and a forming tool are lower, and the problem that the non-equal-diameter closed square pipe beam is difficult to demould is solved.
Description
Technical Field
The invention relates to a method for manufacturing a carbon fiber beam of an unmanned aerial vehicle, in particular to a method for manufacturing a non-equal-diameter closed square tubular carbon fiber beam of the unmanned aerial vehicle.
Background
Along with the development of unmanned aerial vehicles, unmanned aerial vehicle configuration is different day by day, and the structural style of unmanned aerial vehicle roof beam is also diversified, and wherein, non-constant diameter closed type square tubular carbon fiber roof beam has can laminate unmanned aerial vehicle configuration, advantage that load carrying performance is superior in the equal diameter square tubular carbon fiber roof beam. At present, most of non-equal-diameter closed square tubular carbon fiber beams are used as integral components during manufacturing, the defects of difficult demoulding, high production cost, complex processing, long processing period and the like are generally existed during molding, and the molding process and the production tool have higher requirements.
The invention discloses a method for manufacturing a non-equal-diameter closed square tubular carbon fiber beam structural part of an unmanned aerial vehicle (publication number CN 108943769A). The method comprises the steps of firstly manufacturing a rigid prosthesis by using a mould, then manufacturing an air bag core film by using the rigid prosthesis, then combining the air bag core film with the mould, and obtaining a molded product by combining the processes of vacuumizing, vacuum pre-compacting and the like by using a hot-pressing tank. The method is only suitable for tubular carbon fiber parts with large pipe diameter, short pipe length and simple structure, and is not suitable for closed square pipes with small pipe diameter, long pipe length and complex structure.
Disclosure of Invention
The invention provides a method for manufacturing a non-equal-diameter closed square tubular carbon fiber beam of an unmanned aerial vehicle, which aims to effectively solve the technical problems of narrow application range, difficult demoulding, low yield of air bag core films, short service life, complex flow and higher cost of the existing method for manufacturing the non-equal-diameter closed square tubular carbon fiber beam of the unmanned aerial vehicle.
The technical scheme for solving the problems is as follows:
a manufacturing method of an unmanned aerial vehicle non-equal-diameter closed type square tubular carbon fiber beam is characterized by comprising the following steps:
step 1), processing an upper female die and a lower female die:
optimally designing a non-equal-diameter closed square tubular carbon fiber beam to be processed, dividing the beam into an upper beam and a lower beam, and respectively manufacturing a corresponding upper female die and a corresponding lower female die according to the divided upper beam and lower beam; both ends of the upper female die and the lower female die in the length direction are open;
step 2) processing an upper beam by using the upper female die;
step 3) processing a lower beam by using the lower female die;
step 4), gluing the upper beam and the lower beam by using a gluing and folding tool;
and 5) removing the cementing and folding tool to obtain the required non-equal-diameter closed square tubular carbon fiber beam.
Further, the step 4) comprises the following steps:
step 4.1), respectively polishing the contact surfaces of the upper beam and the lower beam, and cleaning;
step 4.2) respectively coating epoxy adhesives on the contact surfaces of the upper beam and the lower beam;
step 4.3) cleaning the lower female die and smearing a release agent, putting the lower beam coated with the epoxy adhesive into the lower female die with the opening facing upwards, then slowly pressing the upper beam opening downwards into the lower beam until the upper surface of the upper beam is 5-10mm higher than the upper surface of the lower female die to form the cemented carbon fiber beam;
step 4.4) placing a plurality of baffles on the upper beam at intervals, wherein the baffles are vertically arranged with the upper beam, so that the baffles are overlapped on the lower female die when descending; fixing a baffle on the upper surface of the lower female die, and pressing the upper beam on the lower female die;
step 4.5) paving a layer of breathable felt on the upper beam, and fixing the breathable felt on the upper beam; arranging an opening on the breathable felt; the distance between the two sides of the opening and the baffle is 15mm to 20 mm;
step 4.6), drawing one end of a vacuum bag through the inner cavity of the cemented carbon fiber beam to ensure that one end of the vacuum bag exceeds the end part of the cemented carbon fiber beam by 30 cm;
step 4.7), folding back the other end of the vacuum bag from the outside of the lower female die, uniformly sleeving the vacuum bag outside the lower female die, and aligning two ends of the vacuum bag; one end of the vacuum bag forms an inner layer, and the other end of the vacuum bag forms an outer layer;
and 4.8) connecting an external vacuum pump between the inner layer and the outer layer of the vacuum bag, vacuumizing for 8-12 hours, and ensuring that the vacuum degree meets the requirement.
Further, the specific method of step 4.6) is as follows:
sleeving a vacuum bag in the protective film, and aligning one end of the vacuum bag and one end of the protective film; the length of the protective film is greater than that of the cemented carbon fiber beam; the length of the vacuum bag is more than twice the length of the cemented carbon fiber beam; fixing one end of a dragging rope at one aligned end of the vacuum bag and the protective film, enabling the other end of the dragging rope to penetrate through the inner cavity of the cemented carbon fiber beam, dragging the protective film and the vacuum bag through the inner cavity of the cemented carbon fiber beam, ensuring that one end of the protective film and one end of the vacuum bag exceed the end part of the cemented carbon fiber beam by 30cm, then releasing the dragging rope, and removing the protective film.
Further, the specific method of step 5) is as follows:
demolish outside vacuum pump, vacuum bag, airfelt and baffle, will solidify the carbon fiber roof beam and break away from the negative mould under on the whole, carry out appearance processing to the remaining limit of solidification carbon fiber roof beam to the sanding incision carries out the finishing, obtains non-constant diameter closed square tubular carbon fiber roof beam.
Further, the vacuum degree in the step 4.8) is more than 0.08 MPa.
Further, the specific method of step 2) is as follows:
cleaning the upper female die, smearing a release agent, then paving and pasting the carbon fiber pre-intrusion material on the inner surface of the upper female die layer by layer according to the thickness and paving and pasting angle required by design, carrying out autoclave curing on the carbon fiber pre-intrusion material, and carrying out demolding treatment after the carbon fiber pre-intrusion material is cooled to obtain the upper beam.
Further, the specific method of step 3) is as follows:
cleaning the lower female die, smearing a release agent, then paving the carbon fiber pre-impregnated material on the inner surface of the lower female die layer by layer according to the thickness and paving angle of the design requirement, curing the carbon fiber pre-impregnated material by an autoclave, and demolding after cooling to obtain the lower beam.
Further, the airfelt in the step 4.4) is bonded with the upper beam through a paper tape; and (4) bonding the baffle plate and the lower female die in the step 4.5) through a paper adhesive tape.
Further, the distance between two sides of the opening and the baffle in the step 4.5) is 15mm to 20 mm;
compared with the prior art, the invention has the beneficial effects that:
1. the invention divides the non-equal-diameter closed square tubular carbon fiber beam into an upper beam and a lower beam, and the upper beam and the lower beam are respectively formed by an upper female die and a lower female die, and then the formed upper beam and the lower beam are bonded to form the non-equal-diameter closed square tubular carbon fiber beam; the integral component is divided into two parts to be formed independently, compared with integral forming, the requirements on a forming process and a forming tool are lower, and the problem that the non-equal-diameter closed square pipe beam is difficult to demould is solved; the invention divides the integral component into two open components, the core mould is not needed in the processing process, the defect of low yield of the air bag core mould is overcome, and the invention can be suitable for large components and medium and small components with complex structures, and has wide application range.
2. When the upper beam and the lower beam are bonded, the lower beam is placed in the lower female die, the upper beam is pressed into the inner cavity of the lower beam, the baffle is tightly attached to the surface of the upper beam, the air felt is placed on the baffle, one end of the vacuum bag penetrates through the inner cavity of the beam and covers the whole lower female die and the air felt in an enveloping manner, and the upper surface of the beam is ensured to be consistent with the surface of the lower female die.
3. The invention simplifies the molding tool and process, ensures the reliable performance and the stable size of the molded product, effectively reduces the production cost and improves the production efficiency.
4. The invention is not only suitable for manufacturing the non-isodiametric tubular carbon fiber composite beam structural part, but also suitable for manufacturing the isodiametric closed square tubular carbon fiber composite beam structure.
Description of the drawings:
FIG. 1 is a flow chart of one embodiment of the present invention;
fig. 2 is a schematic structural view of the carbon fiber beam in this embodiment;
FIG. 3 is a schematic structural view of an upper female die and an upper beam in this embodiment;
FIG. 4 is a schematic structural view of a lower cavity block and a lower beam in this embodiment;
FIG. 5 is a front view of the cementitious closure tool of this embodiment (outer vacuum bag not shown);
FIG. 6 is a left side view of the cemented seaming tool of this embodiment;
reference numerals:
1-upper beam, 2-lower beam, 3-upper female die, 4-lower female die, 5-baffle, 6-air felt, 7-vacuum bag, 8-towing rope, 9-protective film, 10-non-equal-diameter closed square tubular carbon fiber beam and 11-cementation folding tool.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1 to 6:
a manufacturing method of an unmanned aerial vehicle non-equal-diameter closed type square tubular carbon fiber beam comprises the following steps:
step 1) processing an upper female die 3 and a lower female die 4:
the method comprises the steps of optimally designing a non-equal-diameter closed square tubular carbon fiber beam 10 to be processed by adopting CATIA software, dividing the beam into an upper beam 1 and a lower beam 2, respectively manufacturing a corresponding upper female die 3 and a corresponding lower female die 4 according to the divided upper beam 1 and the divided lower beam 2, wherein two ends of the upper female die 3 and the lower female die 4 in the length direction are open.
Step 2) processing the upper beam 1 by using the upper female die 3:
cleaning the upper female die 3, smearing a release agent, then paving and pasting the carbon fiber pre-intrusion material on the inner surface of the upper female die 3 layer by layer according to the thickness and paving and pasting angle of the design requirement, carrying out autoclave curing on the carbon fiber pre-intrusion material, and carrying out demolding treatment after the carbon fiber pre-intrusion material is cooled to obtain the upper beam 1.
Step 3) processing the lower beam 2 by using the upper female die 3:
cleaning the lower female die 4, smearing a release agent, then paving and pasting the carbon fiber pre-intrusion material on the inner surface of the lower female die 4 layer by layer according to the thickness and paving angle required by design, carrying out autoclave curing on the carbon fiber pre-intrusion material, and carrying out demolding treatment after cooling to obtain the lower beam 2. The upper beam 1 and the lower beam 2 can also be processed by a vacuum pressurization method.
Step 4), gluing the upper beam 1 and the lower beam 2 by using a gluing and folding tool 11:
the cementing and folding tool 11 in the embodiment comprises a lower female die 4, five baffle plates 5, an air-permeable felt 6 and a vacuum bag 7. The lower female die 4 is internally provided with a lower beam 2, the opening of the lower beam 2 is upward, the opening of the upper beam 1 is oppositely inserted into the lower beam 2, five baffles 5 are arranged on the lower beam 2 in parallel along the length direction of the lower beam, and a vacuum bag 7 penetrates through the inner cavity of the lower female die 4 and then is coated on the lower female die 4, the baffles 5 and the ventilated felt 6 to form a vacuum cavity.
Step 4.1) respectively polishing two outer side surfaces of the upper beam 1 and two inner side surfaces of the lower beam 2 by using abrasive paper, and cleaning;
step 4.2) respectively coating epoxy adhesives on two outer sides of the upper beam 1 and two inner sides of the lower beam 2;
step 4.3) cleaning the lower female die 4 and coating a release agent, placing the lower beam 2 coated with the epoxy adhesive into the lower female die 4 with the opening upward, then slowly pressing the upper beam 1 with the opening downward into the lower beam 2 until the upper surface of the upper beam 1 is 5-10mm higher than the upper surface of the lower female die 4 to form the cemented carbon fiber beam;
step 4.4) placing five baffles 5 at intervals along the length direction of the upper beam 1, wherein each baffle 5 is perpendicular to the upper beam 1, so that the long edge of each baffle 5 can be positioned above the side wall of the lower female die 4, the baffles 5 are placed on the lower female die 4 when descending, the baffles 5 are adhered to the upper surface of the lower female die 4 by paper tapes, and the upper beam 1 is pressed on the lower female die 4;
step 4.5) paving a layer of breathable felt 6 on the upper beam 1, and bonding the breathable felt 6 on the upper beam 1 through a paper adhesive tape; an opening is arranged on the air-permeable felt 6, and the distance between the positions of two sides of the opening and the baffle 5 is 20 mm;
step 4.6), sleeving the vacuum bag 7 in the protective film 9, and aligning one end of the vacuum bag and one end of the protective film; the length of the protective film 9 is greater than that of the cemented carbon fiber beam; the length of the vacuum bag 7 is more than twice of the length of the cemented carbon fiber beam; fixing one end of a dragging rope 8 at one aligned end of a vacuum bag 7 and a protective film 9, enabling the other end of the dragging rope 8 to penetrate through an inner cavity of the cemented carbon fiber beam, dragging the protective film 9 and the vacuum bag 7 through the inner cavity of the cemented carbon fiber beam to ensure that one ends of the protective film 9 and the vacuum bag 7 exceed the end part of the cemented carbon fiber beam by 30cm, then releasing the dragging rope 8, and removing the protective film 9;
step 4.7), folding back the other end of the vacuum bag 7 from the lower female die 4, uniformly sleeving the vacuum bag outside the lower female die 4, and aligning two ends of the vacuum bag 7; one end of the vacuum bag 7 forms an inner layer, and the other end of the vacuum bag 7 forms an outer layer;
and 4.8) connecting an external vacuum pump between the inner layer and the outer layer of the vacuum bag 7, vacuumizing for 8-12 hours, and ensuring that the vacuum degree is more than 0.08 MPa.
And step 5), removing the external vacuum pump, the vacuum bag 7, the air felt 6 and the baffle 5, integrally separating the cured carbon fiber beam from the lower female die 4, performing contour machining on the remaining edge of the cured carbon fiber beam, and performing sanding on the notch to perform finishing treatment to obtain the non-equal-diameter closed square tubular carbon fiber beam 10.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent flow transformations made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A manufacturing method of an unmanned aerial vehicle non-equal-diameter closed type square tubular carbon fiber beam is characterized by comprising the following steps:
step 1), processing an upper female die (3) and a lower female die (4):
optimally designing a non-equal-diameter closed square tubular carbon fiber beam (10) to be processed, dividing the beam into an upper beam (1) and a lower beam (2), and respectively manufacturing a corresponding upper female die (3) and a corresponding lower female die (4) according to the divided upper beam (1) and the divided lower beam (2); the two ends of the upper female die (3) and the lower female die (4) in the length direction are both open;
step 2) processing an upper beam (1) by using the upper female die (3);
step 3) processing a lower beam (2) by using the lower female die (4);
step 4), gluing the upper beam (1) and the lower beam (2) by using a gluing and folding tool (11);
step 4.1), respectively polishing the contact surfaces of the upper beam (1) and the lower beam (2), and cleaning;
step 4.2) respectively coating epoxy adhesives on the contact surfaces of the upper beam (1) and the lower beam (2);
step 4.3) cleaning the lower female die (4) and smearing a release agent, placing the lower beam (2) which is smeared with the epoxy adhesive into the lower female die (4) with the opening upward, then slowly pressing the upper beam (1) with the opening downward into the lower beam (2) until the upper surface of the upper beam (1) is 5-10mm higher than the upper surface of the lower female die (4), and forming the cemented carbon fiber beam;
step 4.4) placing a plurality of baffles (5) on the upper beam (1) at intervals, wherein the baffles (5) are perpendicular to the upper beam (1), so that the baffles (5) are arranged on the lower female die (4) when descending; fixing a baffle (5) on the upper surface of the lower female die (4), and pressing the upper beam (1) on the lower female die (4);
step 4.5), paving a layer of breathable felt (6) on the upper beam (1), and fixing the breathable felt (6) on the upper beam (1); an opening is arranged on the ventilated felt (6);
step 4.6), drawing one end of a vacuum bag (7) through the inner cavity of the cemented carbon fiber beam to ensure that one end of the vacuum bag (7) exceeds the end part of the cemented carbon fiber beam by 30 cm;
step 4.7), folding back the other end of the vacuum bag (7) from the lower female die (4), uniformly sleeving the vacuum bag outside the lower female die (4), and aligning two ends of the vacuum bag (7); one end of the vacuum bag (7) forms an inner layer, and the other end of the vacuum bag (7) forms an outer layer;
step 4.8) connecting an external vacuum pump between the inner layer and the outer layer of the vacuum bag (7), vacuumizing for 8-12 hours, and ensuring that the vacuum degree meets the requirement;
and 5) removing the cementing and folding tool (11) to obtain the required non-equal-diameter closed square tubular carbon fiber beam (10).
2. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 1, wherein the manufacturing method comprises the following steps:
the specific method of the step 4.6) comprises the following steps:
sleeving a vacuum bag (7) in a protective film (9), and aligning one end of the vacuum bag and one end of the protective film; the length of the protective film (9) is greater than that of the cemented carbon fiber beam; the length of the vacuum bag (7) is more than twice the length of the cemented carbon fiber beam; fixing one end of a dragging rope (8) at one aligned end of a vacuum bag (7) and a protective film (9), enabling the other end of the dragging rope (8) to penetrate through an inner cavity of the cemented carbon fiber beam, dragging the protective film (9) and the vacuum bag (7) through the inner cavity of the cemented carbon fiber beam, ensuring that one end of the protective film (9) and one end of the vacuum bag (7) exceed the end part of the cemented carbon fiber beam by 30cm, then releasing the dragging rope (8), and removing the protective film (9).
3. The method for manufacturing the non-isometric closed type square tubular carbon fiber beam of the unmanned aerial vehicle according to any one of claims 1 to 2, wherein the method comprises the following steps:
the specific method of the step 5) comprises the following steps:
demolish outside vacuum pump, vacuum bag (7), airfelt (6) and baffle (5), will solidify carbon fiber roof beam and wholly break away from female mould (4) down, carry out appearance processing to the remaining limit of solidification carbon fiber roof beam to the sanding incision carries out the finishing, obtains non-constant diameter closed type square tubular carbon fiber roof beam (10).
4. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 3, wherein the manufacturing method comprises the following steps:
the vacuum degree in the step 4.8) is more than 0.08 MPa.
5. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 4, wherein the manufacturing method comprises the following steps:
the specific method of the step 2) comprises the following steps:
cleaning the upper female die (3), smearing a release agent, then paving and pasting the carbon fiber pre-intrusion material on the inner surface of the upper female die (3) layer by layer according to the thickness and paving angle required by design, carrying out autoclave curing on the carbon fiber pre-intrusion material, and carrying out demolding treatment after cooling to obtain the upper beam (1).
6. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 5, wherein the manufacturing method comprises the following steps:
the specific method of the step 3) comprises the following steps:
cleaning the lower female die (4), smearing a release agent, then paving the carbon fiber pre-intrusion material on the inner surface of the lower female die (4) layer by layer according to the thickness and paving angle required by design, curing the carbon fiber pre-intrusion material in an autoclave, and demolding after cooling to obtain the lower beam (2).
7. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 6, wherein the manufacturing method comprises the following steps:
the airfelt (6) in the step 4.4) is bonded with the upper beam (1) through a paper adhesive tape; and (3) bonding the baffle (5) and the lower female die (4) in the step (4.5) through a paper adhesive tape.
8. The manufacturing method of the non-equal-diameter closed square tubular carbon fiber beam for the unmanned aerial vehicle according to claim 7, wherein the manufacturing method comprises the following steps:
the distance between the two sides of the opening and the baffle (5) in the step 4.5) is 15mm to 20 mm.
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| CN101905538B (en) * | 2010-01-14 | 2013-03-27 | 连云港中复连众复合材料集团有限公司 | Process for integrally manufacturing megawatt wind turbine blade |
| CN102661252B (en) * | 2012-05-18 | 2014-01-29 | 连云港中复连众复合材料集团有限公司 | Segmented fan blade as well as preparation and assembly method of segmented fan blade |
| CN103895238A (en) * | 2014-04-15 | 2014-07-02 | 江苏恒神纤维材料有限公司 | Manufacturing method of beam for square cabin subframe and obtained beam |
| CN104260368B (en) * | 2014-07-31 | 2017-01-11 | 上海复合材料科技有限公司 | Production method of large space-deployable composite material component for satellite |
| US20170182706A1 (en) * | 2015-12-29 | 2017-06-29 | Sikorsky Aircraft Corporation | Hollow composite structure and method of manufacturing |
| DE102016208117A1 (en) * | 2016-05-11 | 2017-11-16 | Contitech Mgw Gmbh | Method for producing a charge air tube |
| JP6875976B2 (en) * | 2017-10-27 | 2021-05-26 | 株式会社栗本鐵工所 | Manufacturing method of hollow cylinder |
| CN109774190B (en) * | 2019-01-17 | 2021-04-02 | 江苏恒神股份有限公司 | Manufacturing method of carbon fiber composite multi-pass joint |
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