CN108943769A - The manufacturing method of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane - Google Patents
The manufacturing method of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane Download PDFInfo
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- CN108943769A CN108943769A CN201810640505.2A CN201810640505A CN108943769A CN 108943769 A CN108943769 A CN 108943769A CN 201810640505 A CN201810640505 A CN 201810640505A CN 108943769 A CN108943769 A CN 108943769A
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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
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Textile Engineering (AREA)
- Road Paving Structures (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The present invention relates to a kind of manufacturing methods of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane, mold is made first, then rigid prosthesis is made in mold, make air bag core film again in rigid prosthesis, finally remove rigid prosthesis, the paving prepreg between the gentle capsule-core film of mold is vacuumized, vacuum preloading is real, process combination and solidification obtain product.Integrally formed tooling is effectively simplified, moulding process is simplified, ensure that integrally formed properties of product are reliable, dimensionally stable.
Description
Technical field
The invention belongs to unmanned plane composite material process planning technical fields, are related to a kind of non-isometrical envelope of small and medium size unmanned aerial vehicles
The manufacturing process of closed form square tube type carbon fiber girder construction product.
Background technique
Unmanned plane composite material beam structure type is varied, and molding mode is also had nothing in common with each other.It is multiple with traditional line type
Condensation material girder construction is compared, and complicated non-isometrical enclosed type square tube type girder construction advantage is preferably to arrange the interior of fuselage wing
Portion's topology layout optimizes organism internal structure, effectively carries out load distribution, so that space utilization rate is high, it is good with type, it is especially suitable
Middle-size and small-size High Performance Unmanned Aerial Vehicle housing construction for blended wing-body layout；Moulding process and tooling are wanted when its is integrally formed
Ask high, product stripping is difficult, and to obtain the high quality complex beam infrastructure product for meeting design requirement, preferable molding scheme is
It is pressed and molded using the good core model of stripping result with die combinations.
The Chinese invention patent of notification number CN106182805 A discloses a kind of " isometrical tubulose knot of carbon fibre composite
The manufacturing process of structure " proposes to realize by non-autoclave molding in combination yin using the composite core formwork of metal bar and flexible rubber
Thermal expansion compression molding on mould.This method is suitable for the manufacture of the isometrical tubulose carbon fiber product compared with Large Diameter Pipeline, it is difficult to be applicable in
It is manufactured in complicated enclosed type square tube type beam product, can have metal bar and the demoulding of silicon rubber core model is difficult, core model service life
The problems such as short.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of non-isometrical enclosed type square tube of small and medium size unmanned aerial vehicles
The manufacturing method of shape carbon fiber girder construction product, the molding application of solution isometrical enclosed type square tube type carbon fiber girder construction product by no means
Limitation problem, optimization unmanned plane organism internal structure are laid out, and operability and release property during raising formed product improve
The technique scope of application of integrally formed middle-size and small-size complex structural member makes it be applicable to equal pipe shape carbon fibre composite beam
The manufacture of structural fabrication, it can also be used to the manufacture of non-isometrical enclosed type square tube type carbon fibre composite girder construction.
Technical solution
A kind of manufacturing method of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane, it is characterised in that step
It is as follows:
Step 1: the manufacture of integral gasbag molding die:
The three-dimensional modeling and optimization design that integral gasbag molding die is carried out using CATIA software, by the number after optimization
Model carries out mold processing；The integral gasbag molding die is divided into lower former (1) and upper former (2) two parts, lower yin
Mould (1) and upper former (2) are by positioning pin and are bolted, intermediate after combination to form a cavity, the cavity with it is to be added
The non-isometrical enclosed type square tube type carbon fiber girder construction product shape of the unmanned plane of work is consistent；It is set at integral gasbag molding die both ends
It is equipped with metal baffle, is used for closed above-mentioned cavity；Two end-stopping plates by bolt respectively with lower former (1) and upper former (2) end face
It is located by connecting, and one end baffle plate setting is filled and deflated by connector；
Step 2: the manufacture of air bag core model (3):
Step 2a: successively smearing hole sealing agent on lower former (1) and upper former (2) each inner surface respectively and water solubility is de-
15min is dried in mould agent, and layer-by-layer paving thickness in monolayer is the lamella of 0.1mm on the inner surface of lower former (1) and upper former (2)
Glass cloth Fabric prereg carries out vacuum preloading and makes in fact until forming the preform with product equal thickness during laying
Consolidation is bonded between prepreg；Successively paving non-porous release film, airfelt and vacuum bag on preform, pass through sealant tape
Adhesion formation vacuum tightness system, by containing preform lower former (1) and upper former (2) be placed in vacuum solidification furnace carry out
Solidify: first being heated up with the heating rate of 1-3 DEG C/min, until reaching 120 DEG C of thermostat temperature, keeps the temperature 1 hour；Again with 3 DEG C/
The rate of temperature fall of min cools down, and comes out of the stove to obtain rigid prosthesis up and down when 55 DEG C or less；In entire solidification process into
Row whole process vacuumizes, and vacuum level requirements 0.08MPa or more；
Step 2b: 1 layer of tooling release cloth of paving again distinguishes silicone rubber plate on the inner surface of upper and lower rigid prosthesis respectively
Paving thereon, forms silastic-layer；Silicon rubber layer, the lower former (1) of rigid prosthesis and upper former (2) are closed again
Mould installs both ends metal baffle, wherein connector is nuzzled in silastic-layer in advance on an end-stopping plate, forms the closed combination containing cavity
Body；Nitrogen is filled with cavity, pressure maintaining 0.4Mpa by being filled and deflated by connector；Air-leakage test is carried out to inside cavity, when 5 minutes
When the pressure of interior leakage is no more than 0.017MPa, assembly is put into vacuum solidification furnace and is vulcanized: first with 1-3 DEG C/min's
Heating rate heats up, until reaching 180 DEG C of thermostat temperature, keeps the temperature 2 hours；It is carried out again with the rate of temperature fall of 3 DEG C/min cold
But cool down, come out of the stove when 55 DEG C or less；Whole process is carried out in entire sulfidation to vacuumize, and vacuum level requirements 0.08MPa with
On；
Step 2c: disassembly metal baffle after separating the upper former (2) containing rigid prosthesis, will have the air bag core model of connector
(3) it is separated from the rigid prosthesis inner surface of lower former (1), obtains air bag core model (3) after side finishing more than silicon rubber；
Step 2d: rigid prosthesis is detached from from lower former (1) and upper former (2) respectively；When air bag core model (3) is unsatisfactory for
It can repeat to manufacture using rigid prosthesis and integral gasbag molding die when requirement；
Step 3: the layer-by-layer paving prepreg on lower former (1), paving step is: 1 layer of 0 °/90 ° carbon fibre fabric are pre-
Leaching material paving is on the inner surface of lower former (1)；Successively by 1 layer 0 °/90 ° and 1 layer of ± 45 ° of carbon fibre fabric prepreg paving in
On the left of lower former (1), and extra prepreg is placed on the inoperative type face (4) on the left of lower former (1) respectively, prepreg
Between separated using isolation film；Successively 2 layers 0 °/90 ° and 2 layers ± 45 ° of carbon ribbon prepreg of paving are in the inner surface of lower former (1)
On；By 1 layer of ± 45 ° of carbon fibre fabric prepreg paving on the left of lower former (1)；Successively by 1 layer 0 °/90 ° and 2 layers of ± 45 ° of carbon
Extra prepreg is placed on the left of lower former (1) by the paving of fabric prepreg in the right side of lower former (1), and respectively
On working surface (4), separated between prepreg using isolation film；
The prepreg is stored in -18 DEG C of deepfreeze environment, and evaporated condensation water is formed in preceding packaging bag of breaking seal；Institute
The paving stated is carried out in Clean room, 22 ± 4 DEG C of temperature is kept in Clean room, relative humidity is not more than 65%；
Step 4: metal baffle being installed at lower former (1) both ends, and wherein by air bag core model (3) merging, and be filled and deflated by and connect
Head is fixed on corresponding baffle；Nitrogen is filled with to 0.4MPa in air bag core model (3)；
Step 5: by the work of 1 layer of extra prepreg and right side being reserved on the working surface (4) on the left of lower former (1)
It is successively turned over respectively after the extra prepreg removal isolation film of 3 layers reserved on type face (4) in air bag core model (3) upper surface two sides；
Continue successively 2 layers ± 45 ° and 2 layers 0 °/90 ° carbon ribbon prepreg of paving in air bag core model (3) upper surface；By the inoperative type in left side
The 2 layers of extra prepreg reserved on face (4) successively turn over after removing isolation film respectively in air bag core model (3) upper surface；Upper
1 layer of 0 °/90 ° carbon fibre fabric prepreg of paving on former (2) inner surface；Finally by the upper former (2) respectively containing prepreg
It is combined with lower former (1), metal baffle is installed at both ends, forms closed assembly；
Step 6: being sequentially placed non-porous release film and pattern pressing type high ductibility vacuum bag in closing assembly outer edge, and lead to
Cross the Adhesion formation vacuum tightness system of sealant tape；Vacuum tightness system is placed in vacuum solidification furnace and is solidified: first
It is heated up with the heating rate of 1-3 DEG C/min, until reaching 120 DEG C of thermostat temperature, keeps the temperature 1 hour；Again with the drop of 3 DEG C/min
Warm rate cools down, and comes out of the stove when 55 DEG C or less；It carries out whole process in entire solidification process to vacuumize, and vacuum degree is wanted
Seek 0.08MPa or more；
Step 7: cleaning non-porous release film, pattern pressing type high ductibility vacuum bag, two end-stopping plate of dismountable body, by lower former
(2) whole upwards to be detached from；Air bag core model (3) is carried out after putting nitrogen treatment, by air bag core model (3) from cured product green body
Middle extraction；Product green body is detached from from upper former (1) again, sharp processing is carried out to side more than product, and notch is sanded and carries out light
Whole processing obtains the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane.
The integral gasbag molding die is frame-type metal punching block.
Beneficial effect
A kind of manufacturing method of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane proposed by the present invention, has
Beneficial effect is as follows:
(1) it is excellent to efficiently solve fuselage wing structure layout for the non-isometrical enclosed type square tube type carbon fiber girder construction product
Change problem improves internal body space utilization rate, reduces while its inner space occupies and optimizes housing construction.
(2) solve existing integrally formed carbon fiber girder construction product applies limitation problem, improves formed product mistake
Operability and release property in journey, effectively improve the scope of application of integral forming technique.
3) effectively improve it is integrally formed after release problems, realize the integrally formed of complicated beam structure, and mention
The reliability for having risen product extends the service life of core model；
(4) integrally formed tooling is effectively simplified, moulding process is simplified, ensure that integrally formed properties of product can
It leans on, dimensionally stable.
Detailed description of the invention
Fig. 1 is carbon fiber girder construction product schematic diagram of the present invention；
Fig. 2 is carbon fibre fabric laying schematic diagram；
Fig. 3 is tooling combination schematic diagram before solidifying；
The wherein upper former of former, 2-, 3- air bag core model under 1-；The non-forming working face of 4-；
Fig. 4 mold simple diagram；
Fig. 5 rigid prosthesis makes simple diagram (be separately formed out 2 prostheses, but do not demould)；
Fig. 6 air bag core film production simple diagram (individually in 2 prosthese upper berth silicon rubber)；
Fig. 7 mold pairing figure.
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
The technical scheme is that a kind of non-isometrical enclosed type square tube type carbon fiber girder construction product of small and medium size unmanned aerial vehicles
Manufacturing process, the technique the following steps are included:
Step 1, Fixture Design: according to product three-dimensional digital-to-analogue, carrying out Fixture Design with CATIA software, carries out work by digital-to-analogue
Die-filling tool processing, obtains integral gasbag molding die.Integral gasbag molding die is divided into 2 two parts of lower former 1 and upper former,
Lower former 1 and upper former 2 are by positioning pin and are bolted, intermediate after combination to form a cavity, the cavity with it is to be added
The non-isometrical enclosed type square tube type carbon fiber girder construction product shape of the unmanned plane of work is consistent.It is set in Fixture Design using piecemeal
Meter, to guarantee smoothly to demould after air bag vulcanizes；Composable mold both ends are respectively arranged with baffle, and one end baffle plate setting has and fills, puts
Gas connection port, for the connector that is filled and deflated by of fixation balloon core model 3, and connector uses quick-release connection type.
Step 2, air bag core model 3 is manufactured:
Unpacking molding die, successively smears hole sealing agent and water-soluble mold-release agent on its shaping work face.
Successively paving thickness in monolayer is that the lamella glass cloth of 0.1mm is pre- on the working face of lower former 1 and upper former 2 respectively
Leaching material, until forming the preform with product equal thickness；After the finishing of remaining side, solidification, spread respectively in rigid prosthesis inner surface
1 layer of tooling release cloth is pasted, air bag core model 3 is formed and forms required outer mold surface.
By silastic-layer paving on the respective inner mold face of rigid prosthesis；By the lower yin containing silastic-layer, rigid prosthesis
Mould 1 and upper former 2 are molded, and install overhead gage in two sides, form closed assembly；It is filled with by being filled and deflated by connector
Nitrogen, until the inside cavity of assembly forms 0.4MPa pressure；Air-leakage test is carried out to inside cavity, and when in 5 minutes
When the pressure of leakage is no more than 0.017MPa, assembly is put into vacuum solidification furnace and is vulcanized, main curing parameter is 180
Constant temperature 2 hours at DEG C.It is required that the temperature-controlled precision of vacuum solidification furnace is ± 3 DEG C, temperature uniformity is ± 5 DEG C, vacuum degree when solidification
0.08MPa should be not less than.
Two end-stopping plates and the upper former 2 containing rigid prosthesis are dismantled, air bag core model 3 is taken out；Using blade of cutting a sheet of paper to molding
It is modified to obtain molding air bag core model 3 in the remaining side generated.
Demoulding processing is carried out to the rigid prosthesis on lower former 1 and upper former 2 respectively, obtains corresponding 2 rigid prosthesis.
Air bag core model 3 generally may be reused 6-12 times, if the generation damage of air bag core model 3 cannot function as molding core model, can pass through
The rigid prosthesis and integral gasbag molding die repeat to make.
Step 3, preparation process: preparation is integrally formed to use prepreg.It is required that prepreg is stored in -18 DEG C of deepfreeze environment
In, and evaporated condensation water is formed in preceding packaging bag of breaking seal.
Step 4, preforming:
The layer-by-layer paving prepreg on lower former 1, and extra prepreg (reserved) is separated using isolation film respectively,
It is placed on mould ambilateral inoperative type face.
Baffle is installed at lower 1 both ends of former, and wherein by the merging of air bag core model 3, and is filled and deflated by connector and is fixed on corresponding gear
On plate；Nitrogen is filled with into air bag core model 3 to 0.4MPa.The extra prepreg difference that will be reserved on lower 1 inoperative type face of former
Successively paving is on 3 two sides of air bag core model.
The paving prepreg on upper former 2.
By respectively containing prepreg upper former 2 and lower former 1 be combined, formed closing assembly.
Paving is carried out in Clean room, 22 ± 4 DEG C of temperature is kept in Clean room, relative humidity is not more than 65%, whole process
It is real to carry out necessary vacuum preloading, the method for vacuum preloading reality is that vacuum preloading reality method is successively affixed on preform
Hole isolation film, airfelt, vacuum bag, by the Adhesion formation vacuum tightness system of sealant tape, then by persistently vacuumizing
Mode keeps 0.08MPa or more vacuum degree at least 10 minutes in system.
Step 5, non-porous release film and pattern pressing type Gao Yan process combination and solidification: are sequentially placed in closing assembly outer edge
Malleability vacuum bag, and pass through the Adhesion formation vacuum tightness system of sealant tape；According still further to the solidification of prepreg material specification
Parameter request carries out vacuumizing solidification in vacuum solidification furnace, and primary curing parameter is constant temperature 1 hour at 120 DEG C.
Step 6, demould: cleaning non-porous release film, pattern pressing type high ductibility vacuum bag, two end-stopping plate of dismountable body will
Lower former 2 is whole upwards to be detached from；After carrying out deflation processing to air bag core model 3, by air bag core model 3 from cured product green body
Extraction；Product green body is detached from from upper former 1 again.
Step 7, sharp processing: sharp processing is carried out to side more than product along outer peripheral contour line, and notch is sanded, is carried out
Finishing processing.
Specific embodiment:
The first step, Fixture Design.
Referring to Fig.1, the present embodiment product is typical non-isometrical enclosed type square tube type carbon fiber girder construction shaped piece, not only
It is small in ends, middle part is big, and symmetrical invagination groove is distributed in both ends, can with other carbon fibre composite connector bolts,
It is fixed, and it is convenient for load transmission.
According to product three-dimensional digital-to-analogue, Fixture Design is carried out using CATIA software, mold processing is carried out by digital-to-analogue, obtains whole
Body air bag molding die.
Referring to Fig. 3, integral gasbag molding die is mainly made of lower former 1 and upper former 2, and lower former 1 is main molding
Mold carries out the block design of moulds of industrial equipment along production breakdown interface；Upper former 2 is used cooperatively with lower former 1, by positioning pin and
Bolt connecting mode forms entire combination mold, required for providing when the integrally formed of air bag core model 3 and solidification for product
Mo(u)ld top half face.
On this basis, the integral gasbag molding die both ends after combination are provided with baffle, are convenient for airtight cavity.Baffle is
With the metal plate of mold same material, surface contains bolt hole, by bolt by it respectively with lower former 1 and upper former 2 two
Side end face is cooperatively connected.One of metal plate central region contains centre bore, can be used for being filled and deflated by for fixation balloon core model 3
Connector, the connector use quick-release connection type.
Integral gasbag molding die block design is simple, reasonable, can effectively avoid causing because of excessive block design airtight
Property it is poor the problems such as, by both ends be arranged dismountable block plate, that is, ensure the detachability of type intracavitary good airtightness and baffle,
Be conducive to the positioning and demoulding of air bag core model again.It can be sufficiently by integral gasbag molding die and being used cooperatively for air bag core model 3
Efficiently solve the total quality state before product solidifies and after solidifying, improve product releasability and inside and outside quality can
By property.
Second step manufactures air bag core model 3.
Break seal lower former 1 and upper former 2, successively smeared on each shaping work face hole sealing agent and water-soluble mold-release agent,
Dry 15min.
Referring to Fig. 2, (the rigid prosthesis inner surface is for providing air bag core for the rigid prosthesis manufacture of progress and product equal thickness
Mould 3 forms required outer surface): the layer-by-layer paving prepreg on the working face of lower former 1 and upper former 2 respectively, until shape respectively
At the preform with product equal thickness；Contouring is carried out to preform using paper knife.Single layer is used in the present embodiment
With a thickness of the lamella glass cloth Fabric prereg of δ 0.1mm, it is desirable that carry out necessary vacuum preloading reality, method during laying
As described above.Then process combination and solidification are carried out to the lower former 1 containing preform and upper former 2 respectively.Process combination
Content is successively paving non-porous release film, airfelt and vacuum bag on preform, true by the Adhesion formation of sealant tape
Empty closed system.Solidification process is carried out in vacuum solidification furnace, to the effect that first with the heating rate of 1-3 DEG C/min
It heats up, until reaching 120 DEG C of thermostat temperature, keeps the temperature 1 hour；It is cooled down again with the rate of temperature fall of 3 DEG C/min, directly
It comes out of the stove when to 55 DEG C or less；It carries out whole process in entire solidification process to vacuumize, and vacuum level requirements 0.08MPa or more.
1 layer of tooling release cloth of paving is again by silicone rubber plate point on each rigid prosthesis inner mold face of lower former 1 and upper former 2
Other paving thereon, forms silastic-layer.Require air bag when shaped article that there is certain rigidity and rate of collapsing when paving, it can
Support and positioning action well are played to the prepreg of paving, and the adjustment to bag material thickness can be passed through, it is ensured that vulcanization
Good air-tightness and release property in the process, specific method are the silicon that paving is thicker on each turning of rigid prosthesis and baffle
Rubber layer can be effectively formed certain rigidity, form effective support type face；Connector is nuzzled silicon rubber in advance on one end-stopping plate
In layer, it is ensured that the leakproofness after connector and silicon rubber vulcanization.After paving, contouring is carried out to silastic-layer, future takes
Connect the reserved 5mm surplus in place.
On this basis, the lower former 1 containing silastic-layer, rigid prosthesis and upper former 2 are molded, then combined
Both mold ends install baffle respectively, ultimately form closed assembly.
It is filled with nitrogen to the inside cavity of closed assembly by being filled and deflated by connector, until inside cavity forms 0.4MPa
Pressure；Air-leakage test is carried out to inside cavity, and when the pressure revealed in 5 minutes is no more than 0.017MPa, by assembly
It is put into vacuum solidification furnace and is vulcanized, to the effect that first heated up with the heating rate of 1-3 DEG C/min, until reaching
180 DEG C of thermostat temperature, keep the temperature 2 hours；It is cooled down again with the rate of temperature fall of 3 DEG C/min, is come out of the stove when 55 DEG C or less,
And it demoulds.Finally using cut a sheet of paper blade to air bag molding generate flake more than side modify, obtain air bag core model 3.
Third step, preparation process.
Prepare integrally formed to use prepreg；The prepreg used in the present embodiment is the MTM28/ of thickness in monolayer δ 0.2mm
CF0300-42%RW carbon cloth Fabric prereg and MTM28-1/T700SC-125-33%RW carbon ribbon prepreg.
4th step, prepreg are cut out.
The expansion setting-out of prepreg is carried out by product three-dimensional digital-to-analogue, and the optimization row of prepreg is carried out using AutoCAD
Material design, to improve stock utilization, reduce cost；It reuses CNC cutting machine to be cut out, and to the prepreg cut out
It is marked and lamination is placed.The expansion, setting-out and discharge of size are cut out to prepreg using AutoCAD software, then is made
Be cut out with CNC cutting machine, and be marked with lamination place, when cutting out allow the cut-parts deviation of directivity be ± 1 °, size it is inclined
Difference is ± 1mm.
5th step, prepreg overlay.
Referring to Fig. 2, the layer-by-layer paving prepreg on lower former 1, paving step is: 1 layer of 0 °/90 ° carbon fibre fabric are pre-
Leaching material paving is in the bottom surface (web) of lower former 1；Successively by 1 layer 0 °/90 ° and 1 layer of ± 45 ° of carbon fibre fabric prepreg paving in
Lower 1 left side (left border item) of former, and respectively separate extra prepreg (reserved), it is placed in lower 1 left side inoperative type of former
On face；Successively 2 layers 0 °/90 °, 2 layers ± 45 ° of carbon ribbon prepreg of paving are in the bottom surface (web) of lower former 1；By 1 layer of ± 45 ° of carbon fiber
Fabric prereg paving is tieed up in lower 1 left side (left border item) of former；Successively by 1 layer 0 °/90 ° and 2 layers of ± 45 ° of carbon fibre fabrics preimpregnation
Material paving respectively separates extra prepreg (reserved) in lower 1 right side (right border item) of former, is placed in lower 1 left side of former
On inoperative type face.
Baffle is installed at lower 1 both ends of former, and wherein by the merging of air bag core model 3, and is filled and deflated by connector and is fixed on corresponding gear
On plate；Nitrogen is filled with into air bag core model 3 to 0.4MPa.
By 1 layer at left border item and 3 layers of right border item reserved extra prepreg successively turned over respectively after removing isolation film in
3 upper surface two sides of air bag core model；Continue successively 2 layers ± 45 °, 2 layers 0 °/90 ° carbon ribbon prepreg of paving in table on air bag core model 3
Face；2 layers at left border item reserved extra prepreg are successively turned over respectively after removing isolation film in 3 upper surface of air bag core model.
1 layer of 0 °/90 ° carbon fibre fabric prepreg of paving on upper former 2.
Finally by respectively containing prepreg upper former 2 and lower former 1 be combined, form closed assembly.
It is as follows that range request is crossed in entire paving: vacuum preloading reality should be carried out after the 1st layer of paving, behind every paving 1-3 layer carry out
Vacuum preloading is 1 time real, and vacuum preloading requires as described above in fact；Overlap joint processing should be carried out when carbon fibre fabric prepreg paving, taken
Connecing width is 25mm or so, and adjacent interlayer lap side seam should be staggered 25mm or so, every 5 layers repeat it is staggered.Carbon ribbon preimpregnation
Expect that fiber is not allowed to be radially broken when paving, allows to dock along machine direction, and single layer butt-welded side seam maximal clearance is
1mm。
6th step, process combination and solidification.
It is sequentially placed non-porous release film and pattern pressing type high ductibility vacuum bag in closing assembly outer edge, and passes through sealing
The Adhesion formation vacuum tightness system of adhesive tape；According still further to the cure parameter requirement of prepreg material specification, in vacuum solidification furnace
In carry out vacuumizing solidification, specifically first heated up with the heating rate of 1-3 DEG C/min, until reach 120 DEG C of thermostat temperature,
Heat preservation 1 hour；It is cooled down again with the rate of temperature fall of 3 DEG C/min, is come out of the stove when 55 DEG C or less.
7th step, demoulding and sharp processing.
Non-porous release film, pattern pressing type high ductibility vacuum bag are cleared up, two end-stopping plate of dismountable body is upward by lower former 2
It is whole to be detached from；Air bag core model 3 is carried out after putting nitrogen treatment, air bag core model 3 is extracted out from cured product green body；Again will
Product green body is detached from from upper former 1.Sharp processing is carried out to side more than product, and notch is sanded, carries out finishing processing.
So far, the integrally formed of non-isometrical enclosed type square tube type carbon fiber girder construction product is completed.
It is shown in Figure 4, Fixture Design: upper and lower composable mold；Shown in Fig. 5, rigid prosthesis manufacture: it is separately formed out 2
Prosthese, but do not demould；Shown in Fig. 6, individually in 2 prosthese upper berth silicon rubber；Shown in Fig. 7, pairing；The principle of the invention: 1. silicon rubbers
Glue will become thick rubber fluid at vulcanization (i.e. constant temperature 180 degree), as the continuity of temperature and time will form continuously
, the rubber of sealing, therefore understand when two light blue silastic-layer pairings after and gradually form one with the continuity of temperature and time
A entirety, and inside inflated with nitrogen can preferably form one and press, and make it smooth.
2. steel is not glued with steel.
3. prosthese be respectively it is molding, at a temperature of also do not glue.
4. combining above 3 points, whole core model is obtained after just having piecemeal pairing, and can dismantling pairing.
It is then the process that prosthese is just substituted for product laying 5. arrive formed product.It can be said that being mould
Tool+prosthese → silicon rubber；Mold+silicon rubber → " new prosthese " (i.e. product).
The features of the present invention: using combination the gentle capsule-core mould of former mode be used for product molding, it is ensured that product it is easy
The stability and reliability of release property, quality.Method of the present invention can also be used for isometrical tubulose laminated carbon-fibre composite wood
Expect the manufacture of product.
Claims (2)
1. a kind of manufacturing method of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane, it is characterised in that step is such as
Under:
Step 1: the manufacture of integral gasbag molding die:
The three-dimensional modeling and optimization design that integral gasbag molding die is carried out using CATIA software, by the mathematical model after optimization
Carry out mold processing；The integral gasbag molding die is divided into lower former (1) and upper former (2) two parts, lower former (1)
It by positioning pin and is bolted with upper former (2), it is intermediate after combination to form a cavity, the cavity and nothing to be processed
Man-machine non-isometrical enclosed type square tube type carbon fiber girder construction product shape is consistent；Integral gasbag molding die both ends are provided with gold
Belong to baffle, is used for closed above-mentioned cavity；Two end-stopping plates are determined with lower former (1) and upper former (2) end face respectively by bolt
Position connection, and one end baffle plate setting is filled and deflated by connector；
Step 2: the manufacture of air bag core model (3):
Step 2a: hole sealing agent and water-soluble demoulding are successively smeared on lower former (1) and upper former (2) each inner surface respectively
15min is dried in agent, and layer-by-layer paving thickness in monolayer is the lamella glass of 0.1mm on the inner surface of lower former (1) and upper former (2)
Glass cloth Fabric prereg, until forming the preform with product equal thickness, progress vacuum preloading makes pre- in fact during laying
Consolidation is bonded between leaching material；Successively paving non-porous release film, airfelt and vacuum bag on preform, pass through sealant tape
Adhesion formation vacuum tightness system, by containing preform lower former (1) and upper former (2) be placed in vacuum solidification furnace and consolidated
Change: first being heated up with the heating rate of 1-3 DEG C/min, until reaching 120 DEG C of thermostat temperature, keeps the temperature 1 hour；Again with 3 DEG C/
The rate of temperature fall of min cools down, and comes out of the stove to obtain rigid prosthesis up and down when 55 DEG C or less；In entire solidification process into
Row whole process vacuumizes, and vacuum level requirements 0.08MPa or more；
Step 2b: silicone rubber plate is distinguished paving again by 1 layer of tooling release cloth of paving on the inner surface of upper and lower rigid prosthesis respectively
Thereon, silastic-layer is formed；Silicon rubber layer, the lower former (1) of rigid prosthesis and upper former (2) are molded again, pacified
Both ends metal baffle is filled, wherein connector is nuzzled in silastic-layer in advance on an end-stopping plate, forms the closed assembly containing cavity；It is logical
It overcharges, nitrogen is filled with cavity, pressure maintaining 0.4Mpa by vent connection；Air-leakage test is carried out to inside cavity, is revealed when in 5 minutes
Pressure when being no more than 0.017MPa, assembly is put into vacuum solidification furnace and is vulcanized: first with the heating of 1-3 DEG C/min speed
Rate heats up, until reaching 180 DEG C of thermostat temperature, keeps the temperature 2 hours；It is cooled down again with the rate of temperature fall of 3 DEG C/min,
It comes out of the stove when 55 DEG C or less；It carries out whole process in entire sulfidation to vacuumize, and vacuum level requirements 0.08MPa or more；
Step 2c: disassembly metal baffle, separate the upper former (2) containing rigid prosthesis after, by with connector air bag core model (3) from
The rigid prosthesis inner surface of lower former (1) is separated, and obtains air bag core model (3) after side finishing more than silicon rubber；
Step 2d: rigid prosthesis is detached from from lower former (1) and upper former (2) respectively；When air bag core model (3) be unsatisfactory for using
It is required that when can repeat to manufacture using rigid prosthesis and integral gasbag molding die；
Step 3: the layer-by-layer paving prepreg on lower former (1), paving step is: by 1 layer of 0 °/90 ° carbon fibre fabric prepreg
Paving is on the inner surface of lower former (1)；Successively by 1 layer 0 °/90 ° and 1 layer of ± 45 ° of carbon fibre fabric prepreg paving in Xia Yin
On the left of mould (1), and extra prepreg is placed on the inoperative type face (4) on the left of lower former (1) respectively, between prepreg
It is separated using isolation film；Successively 2 layers 0 °/90 ° and 2 layers ± 45 ° of carbon ribbon prepreg of paving are on the inner surface of lower former (1)；By 1
± 45 ° of carbon fibre fabric prepreg paving of layer are on the left of lower former (1)；Successively 1 layer 0 °/90 ° and 2 layers of ± 45 ° of carbon fiber are knitted
Extra prepreg is placed in the work type on the left of lower former (1) in the right side of lower former (1) by the paving of object prepreg respectively
On face (4), separated between prepreg using isolation film；
The prepreg is stored in -18 DEG C of deepfreeze environment, and evaporated condensation water is formed in preceding packaging bag of breaking seal；Described
Paving is carried out in Clean room, 22 ± 4 DEG C of temperature is kept in Clean room, relative humidity is not more than 65%；
Step 4: metal baffle being installed at lower former (1) both ends, and wherein by air bag core model (3) merging, and it is solid to be filled and deflated by connector
Due on corresponding baffle；Nitrogen is filled with to 0.4MPa in air bag core model (3)；
Step 5: by the working surface of 1 layer of extra prepreg and right side being reserved on the working surface (4) on the left of lower former (1)
(4) it is successively turned over respectively after the extra prepreg removal isolation film of 3 layers reserved in air bag core model (3) upper surface two sides；Continue
Successively 2 layers ± 45 ° and 2 layers 0 °/90 ° carbon ribbon prepreg of paving are in air bag core model (3) upper surface；By the inoperative type face in left side
(4) the 2 layers of extra prepreg reserved on successively turn over after removing isolation film respectively in air bag core model (3) upper surface；In Shang Yin
1 layer of 0 °/90 ° carbon fibre fabric prepreg of paving on mould (2) inner surface；Finally by respectively containing prepreg upper former (2) and
Lower former (1) is combined, and metal baffle is installed at both ends, forms closed assembly；
Step 6: being sequentially placed non-porous release film and pattern pressing type high ductibility vacuum bag in closing assembly outer edge, and by close
The Adhesion formation vacuum tightness system of sealed adhesive tape；Vacuum tightness system is placed in vacuum solidification furnace and is solidified: first with 1-3
DEG C/heating rate of min heats up, until reaching 120 DEG C of thermostat temperature, keep the temperature 1 hour；Again with the cooling speed of 3 DEG C/min
Rate cools down, and comes out of the stove when 55 DEG C or less；It carries out whole process in entire solidification process to vacuumize, and vacuum level requirements
0.08MPa or more；
Step 7: cleaning non-porous release film, pattern pressing type high ductibility vacuum bag, two end-stopping plate of dismountable body, by lower former (2)
It is whole upwards to be detached from；Air bag core model (3) is carried out after putting nitrogen treatment, by air bag core model (3) from cured product green body
Extraction；Product green body is detached from from upper former (1) again, sharp processing is carried out to side more than product, and notch is sanded and carries out finishing
Processing, obtains the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane.
2. a kind of manufacturer of the non-isometrical enclosed type square tube type carbon fiber girder construction product of unmanned plane according to claim 1
Method, it is characterised in that the integral gasbag molding die is frame-type metal punching block.
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