CN104275804A - Preparation method of large-size thin-wall foam sandwich structure and application of structure - Google Patents
Preparation method of large-size thin-wall foam sandwich structure and application of structure Download PDFInfo
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- CN104275804A CN104275804A CN201410228454.4A CN201410228454A CN104275804A CN 104275804 A CN104275804 A CN 104275804A CN 201410228454 A CN201410228454 A CN 201410228454A CN 104275804 A CN104275804 A CN 104275804A
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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
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
-
- 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
- B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
- B29C70/026—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers and with one or more layers of pure plastics material, e.g. foam layers
-
- 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
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
- B29C70/228—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being stacked in parallel layers with fibres of adjacent layers crossing at substantial angles
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Textile Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a preparation method of a large-size thin-wall foam sandwich structure. The preparation method comprises the following steps: (1) laying a prepreg on the outer surface of a die, and solidifying for forming inner skin units, wherein the inner skin units are of cavity structures with closed sections; (2) connecting the multiple inner skin units together in sequence along the axis direction of a cavity by an edge overlapping and adhering mode to form an inner skin; (3) adhering a foam plate to the outer surface of the inner skin; (4) culling foam from parts, in which reinforcement blocks are pre-buried, on the outer surface of the inner skin, and adhering the reinforcement blocks to the parts; and (5) laying the prepreg on the outer surface of the foam plate, then laying an auxiliary material, and performing vacuumizing and solidifying to obtain the whole outer skin. The large-size thin-wall foam sandwich structure prepared by the technical method has the advantages of light weight, excellent heat insulation performance, high rigidity and the like; furthermore, the die investment cost is low; the technical process is simple; the preparation method is convenient to operate and the large-size thin-wall foam sandwich structure is extremely high in practicability.
Description
Technical field
The present invention relates to a kind of preparation method of large size, thin walled foamed sandwich structure and the application of this structure, belong to nonmetal/composite material process planning technical field.
Background technology
In recent years, woven foam sandwich composite material structure is widely applied in fields such as carrier rocket, aviation, blade of wind-driven generator, athletic sports appliance, medical equipment accessory, shipbuilding, train locomotives, especially in developed countries such as America and Japan, be widely used in high-tech sector, mainly contain: the radome fairing of the Delta carrier rocket of the U.S., the radome fairing of the HII-A carrier rocket of Mitsubishi, the locomotive engine of modern architecture in Japan, the medical bed board of company, the blade of wind-driven generator etc. of Vestas such as general, Siemens.China uses woven foam sandwich composite material more late in high-end field application, and at the most of dependence on import of the foam core material of aerospace applications, although domestic in development, overall performance and same kind of products at abroad still exist certain gap.Except in high-end fields such as Aero-Space, at other civil area as bullet train head, blades of large-scale wind driven generator etc., abroad also apply comparatively early, and use in a large number.And domestic association area, apply more late, and most of project is for subcontracting or copying abroad, material therefore used also major part is foreign material, and especially core is mainly import.At present, domestic foam core material composite structure is mainly used in house partition board, refrigerator car dividing plate etc., plays thermal insulation function; The foam core material of application is based on polyurethane (PU) foam.Although China's woven foam sandwich composite material application and research larger gap of existence compared with abroad, but in recent years, domestic air mail space industry, as helicopter blade, rocket radome fairing, guided missile Fragile cap, launching tube cover, wind-tunnel blade have also applied this structure, development rapidly.
Foam interlayer structure compound material is generally the mould of input one side skin, and on mould, shaping covering, is then bonded in foam core material on covering, then at the surface forming opposite side covering of foam core material; Or two side skins are shaping separately separately, then rely on adhesive foam core material and covering to be bonded together.Compared with the sandwich structure composite material that air channel is shaping with current home and abroad: air channel length is longer, sectional dimension is equal and less, but not usually seen in coniform, spherical crown shape; The inside and outside covering in air channel is circumferentially closed, but not the distinguish usually adopted shaping after the version of assembling again.Current technology prepares that air channel exists shaping inside panel Mould Machining difficulty, input cost is high, and the thick inside panel of 2mm exist demoulding difficulty, even cannot the danger of the demoulding; Which kind of foam air channel sandwich material selects can the solidification temperature of fire-retardant, resistance to exterior skin, also there will not be local collapse in the curing process simultaneously; There is foam collapse, air channel appearance deformation and local during exterior skin global formation and there is the problems such as fold.
Summary of the invention
The object of the invention is to the above-mentioned deficiency overcoming prior art, a kind of preparation method of large size, thin walled foamed sandwich structure is provided, not only heat-proof quality is good, good seal performance, product rigidity excellent for the large size, thin walled foamed sandwich structure prepared of the method, lightweight, and with short production cycle, cost is low, efficiency is high, simple and feasible.
Another object of the present invention is the application providing a kind of large size, thin walled foamed sandwich structure.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A preparation method for large size, thin walled foamed sandwich structure, comprises the following steps:
Step (one), employing prepreg carry out laying at mold outer surface, and curing molding inside panel unit, described inside panel unit is the cavity structure that cross section closes;
Step (two), multiple inside panel unit is adopted overlapping edges and bonding mode links together successively along cavity axis direction, form inside panel;
Step (three), cystosepiment is bonded in inside panel outer surface;
Step (four), needed by inside panel outer surface the foam of pre-buried boss position to reject, boss is bonded in described position;
Step (five), adopt prepreg to carry out laying at cystosepiment outer surface, re-lay auxiliary material, and vacuumize, solidify, obtain overall exterior skin.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, carry out local reinforcement in step (two) to the overlapping edges place of inside panel unit, the prepreg namely adopting width to be greater than overlap edge at lap position carries out reinforcement.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the resin carried out in the prepreg of reinforcement is same with the resin-phase formed in the prepreg of inside panel, and fortifying fibre is carbon fiber or glass fibre two-dimensional fabric.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the cross section of inside panel unit is polygon or circle.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, inside panel unit is along length≤3 meter of cavity axis direction.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the prepreg in step (), (five) comprises resin and fortifying fibre, and wherein resin selects epoxy-resin systems, unsaturated polyester resin or phenolic resins; Fortifying fibre selects carbon fiber and carbon cloth thereof, or glass fibre and glass cloth thereof.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, in step (), (five), the ply sequence of prepreg is laying angle (90 °/0 °) n, and wherein n is positive integer, n >=4.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, in step (two), I (three), (four), the bonding agent of bonding employing is J-135 or J-22 adhesive.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the foam in step (three) is phenolic resin foam, polyamide foam or PMI foam.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, inside panel unit in step (), (five), exterior skin solidification process are as follows: first vacuumize, when starting to heat up after vacuum gauge pressure≤-0.09MPa, heating rate controls at 20 ~ 60 DEG C/h, 20 ~ 40min is incubated between 90 ~ 160 DEG C, then pressurized control pressure is 0 ~ 0.6MPa, continue afterwards to heat up, controlling solidification temperature is that 120 ~ 180 DEG C of insulations were naturally down to less than 80 DEG C and are taken out product after 3 ~ 8 hours, completes solidification.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the solidification process carried out in local reinforcement the overlapping edges place of inside panel unit is as follows: first vacuumize, when starting to heat up after vacuum gauge pressure≤-0.09MPa, heating rate controls at 20 ~ 60 DEG C/h, the follow-up temperature of continuing rising of 20 ~ 40min is incubated between 90 ~ 160 DEG C, controlling solidification temperature is that 120 ~ 180 DEG C of insulations were naturally down to less than 80 DEG C and are taken out product after 3 ~ 8 hours, completes solidification.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the thickness >=1.5mm of inside panel, exterior skin.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, in step (three), cystosepiment is bonded in inside panel outer surface, and cystosepiment gaping of joints is repaired.
In the preparation method of above-mentioned large size, thin walled foamed sandwich structure, the auxiliary material laid in step (five) are fluorine four cloth and ventilated membrane, and then use aluminium sheet compression, fix and use airfelt to carry out coated, finally make sealing bag inside and outside covering is sealed, vacuumizes, put into curing oven afterwards.
The application of the foamed sandwich structure that the preparation method of above-mentioned large size, thin walled foamed sandwich structure obtains, as air channel.
The present invention compared with prior art has following beneficial effect:
(1), the present invention is directed to Problems existing in large size, thin walled foamed sandwich structure (such as air channel) preparation process, propose a kind of preparation thinking newly, mould is adopted to prepare inside panel unit first, again inside panel unit is connected, form overall inside panel, namely the mode adopting inside panel sectional forming to overlap again prepares inside panel, by shaping inside panel die length size Control within the specific limits, both Mould Machining difficulty had been reduced, instructions for use and production cost, again reduce the laying difficulty of inside panel, the lifting of demoulding difficulty and mould, transport difficulty, this scheme is utilized to produce inside panel simple to operate, production efficiency is high, and large-sized inside panel can be prepared as required,
(2), the inside and outside covering of the present invention adopts 90 degree and 0 degree of ply sequence lay prepreg alternately, the thickness of covering all has good rigidity when thinner size, along its axis and hoop, there is not local collapse phenomenon in edge or face, the shaping of large size, thin walled component and follow-up assembling and use can be realized, ensure that product quality and performances, and alleviate product weight;
(3), between each unit of inside panel of the present invention, edge mate overlaps and after adopting adhesive bonding, prepreg is adopted to adopt prepreg reinforcement again outside its lap position, both the firmness of lap position can have been strengthened, also can ensure the sealing property of inside panel simultaneously, prevent the air channel of follow-up preparation from leaking gas, scrapping, the sealing property improving air channel is highly profitable;
(4) foam core of the present invention adopts that the method for splicing is bonding on inside panel, assembling, has both reduced the requirement of foam core to process equipment and difficulty of processing, and has also been conducive to the preservation of foam core, transport; The method of more direct spray mo(u)lding foam core reprocessing on covering, the method in shortening life cycle of the product, Foam machining difficulty and Defects in Foam control etc. advantageously;
(5), the present invention carries out preferably inside panel element length, thickness, and consider the processing cost of mould, the realizability of the covering demoulding and the guarantee of the bonding rear rigidity of follow-up inside panel unit, its cut to lengthen is comparatively suitable at 2.5 meters-3 meters; Skin thickness is had any different because reinforcing material is different, and reinforcement is its THICKNESS CONTROL of glass fibre prepreg can ensure product instructions for use at 1.5mm ~ 2mm, and reinforcement is that the prepreg thickness of carbon fiber can be suitably thinning;
(6) mode that, exterior skin of the present invention adopts sealing bag entirely to wrap is cured.Compared with employing half packet mode, exterior skin solidification adopts the sealing bag vacuum of whole subcontracting mode to keep better, is more conducive to ensureing the quality of exterior skin, the rigidity in air channel and its sealing property;
(7), the air channel loss of weight prepared of the present invention is with the obvious advantage, and designability is strong.The air channel lighter in weight prepared by this process, than metal solution loss of weight more than 50%; Simultaneously also can according to air channel instructions for use, the heat-proof quality in design air channel, fire-retardant, wave transparent and stealthy etc. functional;
(8), not only heat-proof quality is good, good seal performance, product rigidity excellent for the large size, thin walled woven foam sandwich composite material prepared of the preparation method of the large size, thin walled foamed sandwich structure of the present invention, lightweight, and with short production cycle, cost is low, efficiency is high, simple and feasible.
The air channel that produces of present invention process method smooth by its inflation, drench with rain and the certification test such as heat-proof quality, than employing metal solution loss of weight nearly 50%.
Accompanying drawing explanation
Fig. 1 is large size, thin walled foamed sandwich structure preparation method process chart of the present invention;
Fig. 2 is inside panel unit formation mould schematic diagram of the present invention;
Fig. 3 is the cross sectional representation of thin-walled foamed sandwich structure prepared by the inventive method;
Fig. 4 is inside panel vacuum or the shaping installation diagram of solidification of hot-press tank in preparation method of the present invention;
Fig. 5 is exterior skin vacuum or the shaping installation diagram of solidification of hot-press tank in preparation method of the present invention;
Wherein: 1. vacuum bag nylon film 2. porose fluorine four isolated material 3. inside panel or the pre-buried boss of its prepreg lamination 4. mold materials 5. vacuum seal rubber belt 6. airfelt 7. barrier film 8. aluminium sheet 9. exterior skin prepreg lamination 10. cystosepiment 11. adhesive 12..
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Embodiment 1
Large size, thin walled foam interlayer structure compound material preparation method comprises the following steps:
(1) adopt S4C660JA/610 high-intensity fiber prepreg as air channel inside panel prepreg, its laying angle is (90 °/0 °)
5, spread 10 layers altogether; Wherein S4C660JA/610 prepreg fiber areal densities is 276 ± 5g/m
2, resin content is 34 ± 3%, and prepreg thickness is 0.25 ± 0.02mm, fabric width 1.0m.
Be illustrated in figure 2 inside panel unit formation mould schematic diagram of the present invention, profile and the inside panel form fit needing to prepare of mould, if the cross section needing the inside panel prepared in the present embodiment is irregular hexagon, the then irregular hexagon of the cross section of mould also for matching, length≤3 meter of mould, be preferably 2.5 ~ 3 meters, the length of the inside panel unit prepared also is 2.5 ~ 3 meters.
Prepreg is after the complete layer in mould upper berth, coated, seal, vacuumize, when the laggard baking oven of vacuum gauge pressure≤-0.090MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, to being incubated 25 ~ 30min solidification when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, after post processing terminates, naturally cool to the room temperature demoulding.Complete the preparation of inside panel unit, prepare 6 inside panel unit altogether.Be illustrated in figure 4 inside panel vacuum or the shaping installation diagram of solidification of hot-press tank in preparation method of the present invention.
(2) 6 inside panel unit are adopted overlapping edges and bonding mode links together successively along cavity axis direction, form inside panel; Lap width, at about 50mm, adopts adhesive J-135 to carry out bonding, the adjustment of the intersegmental linearity in the bonding rear attention portion of each portion section, fixing.
(3) adopt width to be that the SW280F-90a/610 prepreg cloth of 100mm carries out local laying to step (2) bonding location, the center line of laying width overlaps with seam, and the number of plies is 4 layers; Wherein the glass cloth surface density of SW280F-90a/610 prepreg is 280 ± 5g/m
2, resin content 34 ± 3%, prepreg thickness is 0.25 ± 0.02mm, fabric width 900mm.
Prepreg cloth is after inside panel unit each portion section docking location has spread layer, coated at an air channel inner surface entirety preparation sealing bag, sealing, vacuumize, respectively prepare a sealing bag in the local reinforcement position, outside of air channel inside panel coated simultaneously, sealing, vacuumize, when the laggard baking oven of above vacuum bag vacuum gauge pressure≤-0.090MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, to being incubated 25 ~ 30min solidification when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, the room temperature demoulding is naturally cooled to after post processing terminates.
(4) the air channel inside panel of phenolic foam board that is previously prepared, that process on request and step (3) is carried out adaptation, local location can repair phenolic foam board.Phenolic foam board coordinate with air channel inside panel suitable after, J-135 adhesive is adopted to be bonded on the air channel of its correspondence by cystosepiment, then layer overlay aluminium sheet outside cystosepiment, and use outside aluminium sheet and fasten device and aluminium sheet is pressed on cystosepiment, so that fit preferably in cystosepiment and air channel.Wherein phenolic foam board density is at 50 ± 10kg/m
3, compressive strength>=0.15MPa, rate of closed hole>=90%.
(5) aluminium sheet in step of dismantling (4) outside, according to the requirement of local openings or bonding boss, in the setting-out of foam assigned address, reject and need the foam of aperture position or bonding boss position, and on inside panel, need the position of bonding boss to carry out polishing, adaptive.Use J-135 adhesive to be bonded in by boss on inside panel and use and fasten device and be fixed, compress, dismantling after waiting adhesive solidification fastens device, repairs the boss on bonding, makes itself and the smooth transition of Surrounding foam.
(6) at product external surfaces paving prepreg S4C660JA/610 and prepreg cloth SW280F-90a/610, its laying angle is outwards followed successively by (90/0 °/90 °/0 °/90 °/prepreg cloth/0 °) from inner, spreads 7 layers altogether.The wherein same step of the performance parameter of S4C660JA/610 prepreg and SW280F-90a/610 prepreg cloth (1) and (2)
Prepreg is after the complete layer in foam core upper berth, paving one deck fluorine four cloth and ventilated membrane, and then use above aluminium sheet is layered on, and outside aluminium sheet, use adhesive plaster to fix aluminium sheet position, then use successively obturator membrane, airfelt and nylon film coated, seal, vacuumize.When the laggard baking oven of vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, to being incubated 25 ~ 30min solidification when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, after post processing terminates, naturally cool to the room temperature demoulding.Be illustrated in figure 5 exterior skin vacuum or the shaping installation diagram of solidification of hot-press tank in preparation method of the present invention.
(7), after product has taken off mould, can local openings installation component, mounting structure it be made to form the cavity of a sealing, for the air channel of ventilation equipment as required; The depression exist outward appearance or defect can use putty to repair its outward appearance.Be illustrated in figure 1 large size, thin walled foamed sandwich structure preparation method process chart of the present invention.Be illustrated in figure 3 the cross sectional representation of thin-walled foamed sandwich structure prepared by the inventive method, comprise inside panel 3, exterior skin 9, cystosepiment 10 and pre-buried boss 12.
Air channel length through the preparation of above step entirety is about 15m, and during interior the blowing pressure≤3000Pa, air channel is without distortion, abnormal sound, and every min Pressure Drop≤0.5%, weight is about 270kg.
Embodiment 2
Large size, thin walled foam interlayer structure compound material preparation method comprises the following steps:
(1) adopt carbon fiber T300-3K/603 prepreg as air channel inside panel prepreg, its laying angle is (90 °/0 °) 8, spreads 8 layers altogether; Wherein T300-3K/603 prepreg fiber areal densities is 130 ± 5g/m
2, resin content is 44 ± 4%, and prepreg thickness is 0.125 ± 0.02mm, fabric width 1.0m.
Prepreg is after the complete layer in mould upper berth, coated, seal, vacuumize, when the laggard autoclave of vacuum gauge pressure≤-0.090MPa starts to heat up, heating rate controls at 20 ~ 30 DEG C/h, to 120 ~ 125 insulation 30min, then pressurized control pressure is 0.6MPa, then continues to heat up, controlling post-processing temperature is that 80 DEG C, release taking-up product are down in 175 ~ 180 DEG C of insulations naturally after 4 hours, and solidification completes.
Naturally cool to the room temperature demoulding after solidification terminates, obtain inside panel unit.Prepare 6 inside panel unit altogether.
(2) 6 inside panel unit are adopted overlapping edges and bonding mode links together successively along cavity axis direction, form inside panel; Lap width, at about 50mm, adopts adhesive J-135 to carry out bonding, the adjustment of the intersegmental linearity in the bonding rear attention portion of each portion section, fixing.
(3) adopt width to be that MT300-3K carbon cloth/603 prepreg cloth of 100mm carries out local laying to step (2) bonding location, the center line of laying width overlaps with seam, and the number of plies is 4 layers; Wherein the surface density of prepreg cloth is 260 ± 5g/m
2, resin content 44 ± 4%, prepreg thickness is 0.25 ± 0.02mm, fabric width 900mm.
Prepreg cloth is after inside panel unit each portion section docking location has spread layer, coated at air channel inner surface entirety preparation sealing bag, seal, vacuumize, respectively prepare in the local reinforcement position, outside of air channel inside panel simultaneously sealing bag coated, seal, vacuumize, when the laggard baking oven of above vacuum bag vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 30 DEG C/h, to 120 ~ 125 insulation 30min, then continue to heat up, controlling post-processing temperature is that 175 ~ 180 DEG C of insulations are down to the room temperature demoulding after 4 hours naturally.
(4) the air channel inside panel of PMI cystosepiment that is previously prepared, that process on request and step (3) is carried out adaptation, local location can repair phenolic foam board.Cystosepiment coordinate with air channel inside panel suitable after, J-135 adhesive is adopted to be bonded on the air channel of its correspondence by cystosepiment, then layer overlay aluminium sheet outside cystosepiment, and use outside aluminium sheet and fasten device and aluminium sheet is pressed on cystosepiment, so that fit preferably in cystosepiment and air channel.Wherein cystosepiment density is at 70 ± 10kg/m
3, compressive strength>=0.7MPa, rate of closed hole>=90%.
(5) aluminium sheet in step of dismantling (4) outside, according to the requirement of local openings or bonding boss, in the setting-out of foam assigned address, reject and need the foam of aperture position or bonding boss position, and on inside panel, need the position of bonding boss to carry out polishing, adaptive.Use J-135 adhesive to be bonded in by boss on inside panel and use and fasten device and be fixed, compress, dismantling after waiting adhesive solidification fastens device, repairs the boss on bonding, makes itself and the smooth transition of Surrounding foam.
(6) at product external surfaces paving prepreg T300-3K/610 and prepreg cloth MT300-3K/610, its laying angle is outwards followed successively by (90 °/0 °/90 °/0 °/90 °/90 °/0 °/90 °/0 °/prepreg cloth) from inner, spreads 10 layers altogether.The wherein same step of the performance parameter of T300-3K/610 prepreg and SW280F-90a/610 prepreg cloth (1) and (2)
Prepreg is after the complete layer in foam core upper berth, paving one deck fluorine four cloth and ventilated membrane, and then use above aluminium sheet is layered on, and outside aluminium sheet, use adhesive plaster to fix aluminium sheet position, then obturator membrane is used successively, airfelt and nylon film coated, sealing, vacuumize, when the laggard autoclave of vacuum gauge pressure≤-0.090MPa starts to heat up, heating rate controls at 20 ~ 30 DEG C/h, to 120 ~ 125 DEG C of insulation 30min, then pressurized control pressure is 0.3MPa, then continue to heat up, controlling post-processing temperature is that 175 ~ 180 DEG C of insulations are down to 80 DEG C after 4 hours naturally, product is taken out in release, solidification completes.
The room temperature demoulding is naturally cooled to after solidification terminates.
(7), after product has taken off mould, can local openings installation component, mounting structure it be made to form the cavity of a sealing, for the air channel of ventilation equipment as required; The depression exist outward appearance or defect can use putty to repair its outward appearance.
Air channel length through the preparation of above step entirety is about 15m, and in air channel during the blowing pressure≤3000Pa, air channel is without distortion, abnormal sound, and every min Pressure Drop≤0.2%, weight is about 230kg.
Embodiment 3
Large size, thin walled foam interlayer structure compound material preparation method comprises the following steps:
(1) adopt S4C660JA/610 high-intensity fiber prepreg as air channel inside panel prepreg, its laying angle is (90 °/0 °) 5, spreads 10 layers altogether; Wherein S4C660JA/610 prepreg fiber areal densities is 276 ± 5g/m
2, resin content is 34 ± 3%, and prepreg thickness is 0.25 ± 0.02mm, fabric width 1.0m.
Prepreg is after the complete layer in mould upper berth, coated, seal, vacuumize, when the laggard baking oven of vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, 0.3MPa is forced into after being incubated 25 ~ 30min when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, post processing terminates rear release, naturally cools to the room temperature demoulding.Obtain inside panel unit.Prepare 8 inside panel unit altogether.
(2) 8 inside panel unit are adopted overlapping edges and bonding mode links together successively along cavity axis direction, form inside panel; Lap width, at about 50mm, adopts adhesive J-22 to carry out bonding, the adjustment of the intersegmental linearity in the bonding rear attention portion of each portion section, fixing.
(3) adopt width to be that the SW280F-90a/610 prepreg cloth of 100mm carries out local laying to step (2) bonding location, the center line of laying width overlaps with seam, and the number of plies is 4 layers; Wherein the glass cloth surface density of SW280F-90a/610 prepreg is 280 ± 5g/m
2, resin content 34 ± 3%, prepreg thickness is 0.25 ± 0.02mm, fabric width 900mm.
Prepreg cloth is after each portion, air channel section docking location has spread layer, coated at an air channel inner surface entirety preparation sealing bag, sealing, vacuumize, respectively prepare a sealing bag in the local reinforcement position, outside of air channel inside panel coated simultaneously, sealing, vacuumize, when the laggard baking oven of above vacuum bag vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, to being incubated 25 ~ 30min solidification when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, room temperature is naturally cooled to after post processing terminates.
(4) the air channel inside panel of PMI cystosepiment that is previously prepared, that process on request and step (3) is carried out adaptation, local location can repair PMI cystosepiment.Cystosepiment coordinate with air channel inside panel suitable after, J-22 adhesive is adopted to be bonded on the air channel of its correspondence by cystosepiment, then layer overlay aluminium sheet outside cystosepiment, and use outside aluminium sheet and fasten device and aluminium sheet is pressed on cystosepiment, so that fit preferably in cystosepiment and air channel.Wherein PMI cystosepiment density is at 70 ± 10kg/m
3, compressive strength>=1.0MPa, rate of closed hole>=90%.
(5) aluminium sheet in step of dismantling (4) outside, according to the requirement of local openings or bonding boss, in the setting-out of foam assigned address, reject and need the foam of aperture position or bonding boss position, and on inside panel, need the position of bonding boss to carry out polishing, adaptive.Use J-22 adhesive to be bonded in by boss on inside panel and use and fasten device and be fixed, compress, dismantling after waiting adhesive solidification fastens device, repairs the boss on bonding, makes itself and the smooth transition of Surrounding foam.
(6) at product external surfaces paving prepreg S4C660JA/610 and prepreg cloth SW280F-90a/610, its laying angle is outwards followed successively by (90/0 °/90 °/0 °/90 °/prepreg cloth/0 °) from inner, spreads 7 layers altogether.The wherein same step of the performance parameter of S4C660JA/610 prepreg and SW280F-90a/610 prepreg cloth (1) and (2)
Prepreg is after the complete layer in foam core upper berth, paving one deck fluorine four cloth, ventilated membrane, and then use above aluminium sheet is layered on, and outside aluminium sheet, use adhesive plaster to fix aluminium sheet position, then obturator membrane is used successively, airfelt and nylon film coated, sealing, vacuumize, when the laggard autoclave of vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, 0.3MPa is forced into after being incubated 25 ~ 30min when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, the room temperature demoulding is naturally cooled to after post processing terminates.
(7), after product has taken off mould, can local openings installation component, mounting structure it be made to form the cavity of a sealing, for the air channel of ventilation equipment as required; The depression exist outward appearance or defect can use putty to repair its outward appearance.
Air channel length through the preparation of above step entirety is about 18m, and in air channel during the blowing pressure≤3000Pa, air channel is without distortion, abnormal sound, and every min Pressure Drop≤0.5%, weight is 305kg.
Embodiment 4:
Large size, thin walled foam interlayer structure compound material preparation method comprises the following steps:
(1) adopt carbon fiber T300-3K/610 prepreg as air channel inside panel prepreg, its laying angle is (90 °/0 °) 8, spreads 8 layers altogether; Wherein T300-3K/610 prepreg fiber areal densities is 130 ± 5g/m
2, resin content is 44 ± 4%, and prepreg thickness is 0.125 ± 0.02mm, fabric width 1.0m.
Prepreg is after the complete layer in mould upper berth, coated, seal, vacuumize, when the laggard autoclave of vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, 0.6MPa is forced into after being incubated 25 ~ 30min when 90 ~ 95 DEG C, then continue with the ramp of 20 ~ 25 DEG C/h, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, after post processing terminates, naturally cool to the room temperature demoulding.Complete the preparation of inside panel unit, prepare 6 inside panel unit altogether.
(2) after air channel inside panel unit formation 6, it is adaptive to carry out overlap joint between each, and lap width, at about 60mm, adopts adhesive J-135 to carry out bonding, the adjustment of the intersegmental linearity in the bonding rear attention portion of each portion section, fixing.
(3) adopt width to be that the SW280F-90a/610 prepreg cloth of 100mm carries out local laying to step (2) bonding location, the center line of laying width overlaps with seam, and the number of plies is 4 layers; Wherein the glass cloth surface density of SW280F-90a/610 prepreg is 280 ± 5g/m
2, resin content 34 ± 3%, prepreg thickness is 0.25 ± 0.02mm, fabric width 900mm.
Prepreg cloth is after each portion, air channel section docking location has spread layer, coated at air channel inner surface entirety preparation sealing bag, seal, vacuumize, respectively prepare in the local reinforcement position, outside of air channel inside panel simultaneously sealing bag coated, seal, vacuumize, when the laggard baking oven of above vacuum bag vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, continue with the ramp of 20 ~ 25 DEG C/h after being incubated 25 ~ 30min when 90 ~ 95 DEG C, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, after post processing terminates, naturally cool to room temperature.
(4) the air channel inside panel of phenolic foam board that is previously prepared, that process on request and step (3) is carried out adaptation, local location can repair cystosepiment.Phenolic foam board coordinate with inside panel suitable after, J-135 adhesive is adopted to be bonded on the air channel of its correspondence by cystosepiment, then layer overlay aluminium sheet outside cystosepiment, and use outside aluminium sheet and fasten device and aluminium sheet is pressed on cystosepiment, so that fit preferably in cystosepiment and air channel.Wherein phenolic foam board density is at 50 ± 10kg/m
3, compressive strength>=1.0MPa, rate of closed hole>=90%.
(5) aluminium sheet in step of dismantling (4) outside, according to the requirement of local openings or bonding boss, in the setting-out of foam assigned address, reject and need the foam of aperture position or bonding boss position, and on inside panel, need the position of bonding boss to carry out polishing, adaptive.Use J-135 adhesive to be bonded in by boss on inside panel and use and fasten device and be fixed, compress, dismantling after waiting adhesive solidification fastens device, repairs the boss on bonding, makes itself and the smooth transition of Surrounding foam.
(6) at product external surfaces paving prepreg T300-3K/610 and prepreg cloth SW280F-90a/610, its laying angle is outwards followed successively by (90 °/0 °/90 °/0 °/90 °/90 °/0 °/90 °/0 °/prepreg cloth) from inner, spreads 10 layers altogether.The wherein same step of the performance parameter of T300-3K/610 prepreg and SW280F-90a/610 prepreg cloth (1) and (2)
Prepreg is after the complete layer in foam core upper berth, paving one deck fluorine four cloth, ventilated membrane, and then use above aluminium sheet is layered on, and outside aluminium sheet, use adhesive plaster to fix aluminium sheet position, then use successively obturator membrane, airfelt and nylon film coated, seal, vacuumize, when the laggard baking oven of vacuum gauge pressure≤-0.096MPa starts to heat up, heating rate controls at 20 ~ 25 DEG C/h, continue with the ramp of 20 ~ 25 DEG C/h after being incubated 25 ~ 30min when 90 ~ 95 DEG C, rise to 130 ~ 135 DEG C of insulation 4h and carry out post processing, after post processing terminates, naturally cool to the room temperature demoulding.
(7), after product has taken off mould, can local openings installation component, mounting structure it be made to form the cavity of a sealing, for the air channel of ventilation equipment as required; The depression exist outward appearance or defect can use putty to repair its outward appearance.
Air channel length through the preparation of above step entirety is about 12m, and in air channel during the blowing pressure≤3000Pa, air channel is without distortion, abnormal sound, and every min Pressure Drop≤0.4%, weight is 180kg.
The above; be only the detailed description of the invention of the best of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content be not described in detail in description of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (15)
1. a preparation method for large size, thin walled foamed sandwich structure, is characterized in that: comprise the following steps:
Step (one), employing prepreg carry out laying at mold outer surface, and curing molding inside panel unit, described inside panel unit is the cavity structure that cross section closes;
Step (two), multiple inside panel unit is adopted overlapping edges and bonding mode links together successively along cavity axis direction, form inside panel;
Step (three), cystosepiment is bonded in inside panel outer surface;
Step (four), needed by inside panel outer surface the foam of pre-buried boss position to reject, boss is bonded in described position;
Step (five), adopt prepreg to carry out laying at cystosepiment outer surface, re-lay auxiliary material, and vacuumize, solidify, obtain overall exterior skin.
2. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, it is characterized in that: carry out local reinforcement to the overlapping edges place of inside panel unit in described step (two), the prepreg namely adopting width to be greater than overlap edge at lap position carries out reinforcement.
3. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 2, it is characterized in that: described in carry out resin in the prepreg of reinforcement and the resin-phase formed in the prepreg of inside panel with, fortifying fibre is carbon fiber or glass fibre two-dimensional fabric.
4. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, is characterized in that: the cross section of described inside panel unit is polygon or circle.
5. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, is characterized in that: described inside panel unit is along length≤3 meter of cavity axis direction.
6. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, it is characterized in that: the prepreg in described step (), (five) comprises resin and fortifying fibre, and wherein resin selects epoxy-resin systems, unsaturated polyester resin or phenolic resins; Fortifying fibre selects carbon fiber and carbon cloth thereof, or glass fibre and glass cloth thereof.
7. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1 or 6, it is characterized in that: in described step (), (five), the ply sequence of prepreg is laying angle (90 °/0 °) n, wherein n is positive integer, n >=4.
8. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, is characterized in that: in described step (two), I (three), (four), the bonding agent of bonding employing is J-135 or J-22 adhesive.
9. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, is characterized in that: the foam in described step (three) is phenolic resin foam, polyamide foam or PMI foam.
10. the preparation method of a kind of large size, thin walled foamed sandwich structure according to claim 1, it is characterized in that: described step (), (5) the inside panel unit in, exterior skin solidification process is as follows: first vacuumize, when starting to heat up after vacuum gauge pressure≤-0.09MPa, heating rate controls at 20 ~ 60 DEG C/h, 20 ~ 40min is incubated between 90 ~ 160 DEG C, then pressurized control pressure is 0 ~ 0.6MPa, continue afterwards to heat up, controlling solidification temperature is that 120 ~ 180 DEG C of insulations were naturally down to less than 80 DEG C and are taken out product after 3 ~ 8 hours, complete solidification.
The preparation method of 11. a kind of large size, thin walled foamed sandwich structures according to claim 2, it is characterized in that: the described solidification process carried out in local reinforcement the overlapping edges place of inside panel unit is as follows: first vacuumize, when starting to heat up after vacuum gauge pressure≤-0.09MPa, heating rate controls at 20 ~ 60 DEG C/h, the follow-up temperature of continuing rising of 20 ~ 40min is incubated between 90 ~ 160 DEG C, controlling solidification temperature is that 120 ~ 180 DEG C of insulations were naturally down to less than 80 DEG C and are taken out product after 3 ~ 8 hours, completes solidification.
The preparation method of 12. a kind of large size, thin walled foamed sandwich structures according to claim 1, is characterized in that: the thickness >=1.5mm of described inside panel, exterior skin.
The preparation method of 13. a kind of large size, thin walled foamed sandwich structures according to claim 1, is characterized in that: in described step (three), cystosepiment is bonded in inside panel outer surface, and repairs cystosepiment gaping of joints.
The preparation method of 14. a kind of large size, thin walled foamed sandwich structures according to claim 1, it is characterized in that: the auxiliary material laid in described step (five) are fluorine four cloth and ventilated membrane, and then use aluminium sheet compression, fix and use airfelt to carry out coated, finally make sealing bag inside and outside covering is sealed, vacuumizes, put into curing oven afterwards.
15. claim 1-6, the application of the foamed sandwich structure that the preparation method of a kind of large size, thin walled foamed sandwich structure described in 8-14 obtains, is characterized in that: as air channel.
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