CN106853694A - The preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core - Google Patents
The preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core Download PDFInfo
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- CN106853694A CN106853694A CN201710092893.0A CN201710092893A CN106853694A CN 106853694 A CN106853694 A CN 106853694A CN 201710092893 A CN201710092893 A CN 201710092893A CN 106853694 A CN106853694 A CN 106853694A
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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
- B29C70/36—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 impregnating by casting, e.g. vacuum casting
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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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- 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
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Abstract
The present invention relates to a kind of preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core, the method is the core that grid is prepared with soluble material first, carbon fiber prepreg paving is carried out in the above, product solidification is carried out using SQRTM moulding process, later stage is dissolved its water-soluble core mould by the running water of certain pressure, and the demoulding obtains grid product.The release problems of grid higher curvature complexity product are this method solve, the SQRTM techniques of use combine prepeg process and liquid RTM forming techniques, effectively reduce manufacturing cost, and the high performance requirements of product are also ensure that while preparing net molded article.This invention can provide feasible solution for the parts of composite material aircraft complex curvatures.
Description
Technical field
It is the present invention relates to a kind of composite material forming method technical field more particularly to a kind of based on water-soluble core
The preparation method of SQRTM moulding process carbon fiber grilles.
Background technology
Carbon fiber enhancement resin base composite material（CFRP）One of current state-of-the-art composite, with specific strength and
Specific stiffness is high, thermal coefficient of expansion is small, anti-fatigue ability is strong and designability is strong, the features such as be easy to global formation, can effectively subtract
The architecture quality of light Aero-Space parts, is the inexorable trend of New Aerospace Materials development field.Current small-sized business machine
55% or so has been accounted for the carbon fibre composite consumption of helicopter, military aircraft 25% or so, airliner accounts for 20% or so.
The extensive application of composite can bring high cost, except raw material carbon fiber, the design of composite and
It has been manufactured into the key factor of restriction development.The resin-based compound material component that current aviation field is used is mostly using preimpregnation
Material/autoclave molding method, autoclave molding prepare composite property is excellent, steady quality reliability, in aviation composite wood
Core status are occupied in material forming technique, but its high process costs is always the common fault of manufacturer.Currently employed is non-thermal
Pressure tank（OAA）Technique effectively reduces manufacturing cost, but they are few ingenious more than SQRTM technologies.SQRTM it be one
Closed moulding method is planted, with reference to prepeg process and Liquid molding techniques, the boat of net shaping and high-strength combination can be prepared
Empty space flight parts, although do not use autoclave, but produce the part with autoclave quality.
The complexity of the parts of composite material aircraft is it is well known that for the structure member of multi-curvature, the demoulding
Already turn into the problem for preparing product.The present invention prepares the core of hyperbolicity using soluble material, is carried out on core
Prepreg overlay, product is solidified using SQRTM moulding process injecting glue, and the later stage is by the running water of certain pressure by its Water-Soluble Core
Mould dissolves, and the demoulding obtains grid product, solves the problems, such as that the demoulding of complex curvatures product is difficult.
Therefore, it is now necessary to which the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core is provided；
For solving complex curvatures composite material parts and reducing the problem of composite manufacturing cost.
The content of the invention
The technical problem to be solved in the present invention is to provide the SQRTM moulding process carbon fiber grilles based on water-soluble core
Preparation method；For solving complex curvatures composite material parts and reducing the problem of composite manufacturing cost.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：SQRTM shapings based on water-soluble core
The preparation method of technique carbon fiber grille, comprises the following steps：（1）The core of grid is prepared with soluble material, is obtained water-soluble
Property core；（2）Carbon fiber prepreg paving is carried out on the water-soluble core mould, using SQRTM（Identical qualified resin transmission
Shaping）Moulding process carries out product solidification, and grid product is obtained；（3）Its water-soluble core mould is dissolved by running water again, the demoulding
Obtain grid product.Using above-mentioned technical proposal, the method is the core that grid is prepared with soluble material first, preparation
Core has certain hardness, it is ensured that the quality requirement of grid surface of internal cavity, and carbon fiber prepreg paving is carried out in the above,
Prepreg paving carries out pre-compacted after finishing with vacuum, and product injecting glue solidification is carried out using SQRTM moulding process, by prepreg work
Skill and Liquid molding techniques are cleverly combined together, and the performance requirement of product is also assures that while reducing manufacturing cost,
Later stage is dissolved its water-soluble core mould by the running water of certain pressure, and the demoulding obtains grid product, solves hyperbolicity grid
The difficult problem of the product demoulding.Wherein, the soluble material is that water-soluble adhesives and quartz sand are mixed, and is used exclusively for
The material of precision manufactureing, there is preferably slight and lower porosity, thus can have in the core for preparing one it is smooth
Curved surface；The soluble material can also be gypsum or soluble silicate.During the later stage demoulding, the demoulding by being washed away with running water,
It is environment-friendly, save time and labour.
Further improvement is that, the step（1）The core that grid is prepared with soluble material, be obtained water-soluble core mould
Specific preparation process include：
1）Insert core material：Soluble core material is put into the die cavity of core mould, it is tight by core mould upper cover plate
Be compacted for soluble core material by fixing bolt；
2）Core solidifies：By step 1）Core mould after middle compacting is solidified in being put into baking oven, and solidification temperature is 100 ~ 140
DEG C, hardening time is 1 ~ 3h, is cooled to less than 60 DEG C and opens the baking oven taking-up core mould；
3）Core is sealed：The core mould of taking-up is sealed with surface sealer, it is stand-by.
Wherein preferred, the temperature of the solidification of the core of soluble material is 120 DEG C, and hardening time is 2h.
Further improvement is that, the step（2）Middle SQRTM molding process is to replace dry with a prepreg overlay
Fiber preform body, prepreg overlay is laid in core mould, and closes core mould, and resin is then injected into institute
State in core mould and the step（3）The demoulding is comprised the following steps that：
（A）Prepreg overlay：The carbon fiber prepreg paving of designated shape will be cut into soluble mandrel surface, paving is finished
After carry out vacuum preloading reality, vacuum pressure >=920mbar；
（B）Matched moulds：The carbon fiber prepreg laying that pre-compacted is crossed is placed on the locating clamp plate in core mould, and surrounding is put into
Positioning press strip, then the mold of core mould is covered, mold is locked by bolt；
（C）Injecting glue：Connection glue injection pipeline heats core mould simultaneously, when core mold temperature reaches injecting glue temperature, starts note
Glue simultaneously provides injection pressure；
（D）Solidification：After injecting glue terminates, firing equipment presses resin curing conditions and sets elevated cure, and solidification temperature is 170 ~ 200 DEG C
Hardening time is 1 ~ 3h；
（E）The demoulding：Treat that core mould cools to less than 60 DEG C, soluble core is dissolved with running water, until soluble
Core dissolving is finished, and obtains grid product.
Employ SQRTM techniques, it is ensured that reduce manufacturing cost outside the high performance requirements of grid product；Prepreg paving
After finishing, carry out vacuumizing pre-compacted, drive the bubble between prepreg away, it is ensured that the required precision of product.
Further improvement is that, the carbon fiber prepreg is twills carbon fiber prepreg or/and unidirectional carbon
Prepreg.
Further improvement is that, resin used by injecting glue is same resin with prepreg resin.
Further improvement is that, the curved surface cell structure form that obtained grid product is hyperbolicity, muscle in length and breadth is interlocked.
Further improvement is that, the step（C）In the injection pressure be 2 ~ 6bar.
Compared with prior art, the invention has the advantages that：The present invention is a kind of based on water-soluble core
The preparation method of SQRTM moulding process carbon fiber grilles；Soluble material is employed to prepare the grid core of hyperbolicity, later stage
Grid product can be obtained by the originally water dissolves core of certain pressure, solve the release problems of complex curvatures product；This
The SQRTM moulding process for using is invented, compared with conventional thermocompression tank shaping process, be also assures that while reducing manufacturing cost
The stability of product quality.
Brief description of the drawings
Technical scheme is further described below in conjunction with the accompanying drawings：
Fig. 1 is core schematic diagram prepared by soluble material of the invention；
Fig. 2 is the structural representation of the grid of SQRTM moulding process of the present invention based on water-soluble core；
Wherein 1- indulges muscle, 2- horizontal bars.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and Examples is further retouched in detail
State, the embodiment is only used for explaining the present invention, protection scope of the present invention is not constituted and is limited.
Embodiment 1：As shown in Figure 1 and 2, the preparation method of the grid of the SQRTM moulding process of water-soluble core should be based on,
Comprise the following steps：
（1）The preparation of soluble core：Soluble core material is put into core die cavity first, will by mould fastening bolt
Soluble core material compacting；It is put into baking oven afterwards to be solidified, solidification temperature is：120 DEG C, hardening time is 2h, is cooled to
Baking oven is opened for less than 60 DEG C to take out；Core after drying and moulding as shown in figure 1, be the surface smoothness for ensureing product, shaping
Mandrel surface is sealed using surface sealer, and the later stage carries out composite plys；
（2）Carbon fiber prepreg paving is carried out on the water-soluble core mould, using SQRTM（Identical qualified resin is transmitted into
Type）Moulding process carries out product solidification, and grid product is obtained；
（3）Its water-soluble core mould is dissolved by running water again, the demoulding obtains grid product；
Wherein：Prepreg overlay：Required carbon fiber prepreg is designed into blanking figure, Optimization Cutting shape, certainly by CAD software
Cut on dynamic cutter, every layer encodes and carry out paving record successively；Paving is distinguished successively after finishing above prepreg
The auxiliary materials such as the peelable cloth of laying, barrier film, airfelt and vacuum bag are encapsulated using vacuum bag, vacuumize pre-compacted.
Matched moulds：The prepreg overlay that pre-compacted is crossed is placed on locator card in mould according to the arrangement position of muscle in length and breadth 2 successively
On plate, corner region is filled with unidirectional pre-immersion material, it is ensured that the resin content uniformity consistency of whole product, finally in mould surrounding
Positioning press strip is put into, mold is covered, by bolt locking die.
Injecting glue solidifies：After matched moulds, vacuum and injecting glue pipeline are connected, heat mould, at the same time, resin in heating glue-injection machine
To 85 DEG C, and carry out resin deaeration 15min ~ 25min；When mould is heated to 120 DEG C, start injecting glue, basis during injecting glue
Resin flow velocity is pressurizeed, and with the reduction of resin flow velocity, injection pressure gradually increases, it is ensured that it is fine that resin can fully infiltrate carbon
Dimensional fabric.Pressure is finally controlled in 6bar, and pressure is excessive, and the dimension precision requirement of product, performance reduction are influenceed on the contrary；Injecting glue is complete
Bi Hou, carries out resin solidification, and solidification temperature is：180 DEG C, hardening time is 2h, and after end to be solidified, firing equipment stops adding
Heat, mould naturally cools to less than 60 DEG C；
The demoulding：Mould is placed on demoulding region using crane, bolt is turned on, positioning press strip is removed, by product and core one
Rise and deviate from from mould, soluble core is rinsed with the running water with certain pressure, until soluble core dissolving is finished, clearly
Reason product flash, is made carbon fibre composite grid product；As shown in Figure 2.
Embodiments of the present invention not limited to this, soluble core material could alternatively be soluble silicate, gypsum etc..
For Aero-Space complex curvatures abnormity parts, the multi-cavity structure that muscle in length and breadth is staggered to form can take this embodiment party
Case.Compared with traditional autoclave technique, manufacturing cost is greatly reduced, the product phase of its mechanical property and autoclave technique
When, possessing good internal soundness, fiber volume fraction can be controlled in 55 ± 3%, and porosity is low, meets as Aero-Space zero
The requirement of part.
Embodiment 2：This is based on the preparation method of the grid of the SQRTM moulding process of water-soluble core, comprises the following steps：
（1）The preparation of soluble core：First by soluble core material（Gypsum）It is put into core die cavity, is fastened by mould
Be compacted for soluble core material by bolt；It is put into baking oven afterwards to be solidified, solidification temperature is：100 DEG C, hardening time is 3h,
It is cooled to less than 60 DEG C and opens baking oven taking-up；Core after drying and moulding as shown in figure 1, be the surface smoothness for ensureing product,
The mandrel surface of shaping is sealed using surface sealer, and the later stage carries out composite plys；
（2）Carbon fiber prepreg paving is carried out on the water-soluble core mould, using SQRTM（Identical qualified resin is transmitted into
Type）Moulding process carries out product solidification, and grid product is obtained；
（3）Its water-soluble core mould is dissolved by running water again, the demoulding obtains grid product；
Wherein：Prepreg overlay：Required carbon fiber prepreg is designed into blanking figure, Optimization Cutting shape, certainly by CAD software
Cut on dynamic cutter, every layer encodes and carry out paving record successively；Paving is distinguished successively after finishing above prepreg
The auxiliary materials such as the peelable cloth of laying, barrier film, airfelt and vacuum bag are encapsulated using vacuum bag, vacuumize pre-compacted.
Matched moulds：The prepreg overlay that pre-compacted is crossed is placed on locator card in mould according to the arrangement position of muscle in length and breadth 2 successively
On plate, corner region is filled with unidirectional pre-immersion material, it is ensured that the resin content uniformity consistency of whole product, finally in mould surrounding
Positioning press strip is put into, mold is covered, by bolt locking die.
Injecting glue solidifies：After matched moulds, vacuum and injecting glue pipeline are connected, heat mould, at the same time, resin in heating glue-injection machine
To 85 DEG C, and carry out resin deaeration 25min；When mould is heated to 120 DEG C, start injecting glue, according to resin stream during injecting glue
Speed is pressurizeed, and with the reduction of resin flow velocity, injection pressure gradually increases, it is ensured that resin can fully infiltrate carbon fiber and knit
Thing.Pressure is finally controlled in 6bar, and pressure is excessive, and the dimension precision requirement of product, performance reduction are influenceed on the contrary；Injecting glue is finished
Afterwards, resin solidification is carried out, solidification temperature is：170 DEG C, hardening time is 3h, and after end to be solidified, firing equipment stops heating,
Mould naturally cools to less than 60 DEG C；
The demoulding：Mould is placed on demoulding region using crane, bolt is turned on, positioning press strip is removed, by product and core one
Rise and deviate from from mould, soluble core is rinsed with the running water with certain pressure, until soluble core dissolving is finished, clearly
Reason product flash, is made carbon fibre composite grid product.
Embodiment 3：This is based on the preparation method of the grid of the SQRTM moulding process of water-soluble core, comprises the following steps：
（1）The preparation of soluble core：First by soluble core material（Soluble silicate）It is put into core die cavity, passes through
Be compacted for soluble core material by mould fastening bolt；It is put into baking oven afterwards to be solidified, solidification temperature is：140 DEG C, during solidification
Between be 1h, be cooled to less than 60 DEG C open baking ovens take out；Core after drying and moulding is as shown in figure 1, be the surface of guarantee product
Finish, the mandrel surface of shaping is sealed using surface sealer, and the later stage carries out composite plys；
（2）Carbon fiber prepreg paving is carried out on the water-soluble core mould, using SQRTM（Identical qualified resin is transmitted into
Type）Moulding process carries out product solidification, and grid product is obtained；
（3）Its water-soluble core mould is dissolved by running water again, the demoulding obtains grid product；
Wherein：Prepreg overlay：Required carbon fiber prepreg is designed into blanking figure, Optimization Cutting shape, certainly by CAD software
Cut on dynamic cutter, every layer encodes and carry out paving record successively；Paving is distinguished successively after finishing above prepreg
The auxiliary materials such as the peelable cloth of laying, barrier film, airfelt and vacuum bag are encapsulated using vacuum bag, vacuumize pre-compacted.
Matched moulds：The prepreg overlay that pre-compacted is crossed is placed on locator card in mould according to the arrangement position of muscle in length and breadth 2 successively
On plate, corner region is filled with unidirectional pre-immersion material, it is ensured that the resin content uniformity consistency of whole product, finally in mould surrounding
Positioning press strip is put into, mold is covered, by bolt locking die.
Injecting glue solidifies：After matched moulds, vacuum and injecting glue pipeline are connected, heat mould, at the same time, resin in heating glue-injection machine
To 85 DEG C, and carry out resin deaeration 15min；When mould is heated to 120 DEG C, start injecting glue, according to resin stream during injecting glue
Speed is pressurizeed, and with the reduction of resin flow velocity, injection pressure gradually increases, it is ensured that resin can fully infiltrate carbon fiber and knit
Thing；Pressure is finally controlled in 2bar, and pressure is excessive, and the dimension precision requirement of product, performance reduction are influenceed on the contrary；Injecting glue is finished
Afterwards, resin solidification is carried out, solidification temperature is：190 DEG C, hardening time is 1h, and after end to be solidified, firing equipment stops heating,
Mould naturally cools to less than 60 DEG C；
The demoulding：Mould is placed on demoulding region using crane, bolt is turned on, positioning press strip is removed, by product and core one
Rise and deviate from from mould, soluble core is rinsed with the running water with certain pressure, until soluble core dissolving is finished, clearly
Reason product flash, is made carbon fibre composite grid product.
Embodiment of the present invention epoxy resin and its curing agent are the public general knowledge of those skilled in the art, its institute's generation
Table is various types of resins and its curing agent under thermosetting resin.The present invention is not limited to above-mentioned particular implementation, is not taking off
The various deformations or amendments made on the premise of the above-mentioned basic fundamental thought, all fall within the row of rights protection scope of the present invention.
Claims (8)
1. a kind of preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core, it is characterised in that including with
Lower step：（1）The core of grid is prepared with soluble material, water-soluble core mould is obtained；（2）Enter on the water-soluble core mould
Row carbon fiber prepreg paving, using SQRTM（Identical qualified resin transfer molding）Moulding process carries out product solidification, and lattice are obtained
Grid product；（3）Its water-soluble core mould is dissolved by running water again, the demoulding obtains grid product.
2. the preparation method of the SQRTM moulding process carbon fiber grilles of water-soluble core is based on according to claim 1, and it is special
Levy and be, the step（1）The core that grid is prepared with soluble material, be obtained water-soluble core mould specific preparation process bag
Include：
1）Insert core material：Soluble core material is put into the die cavity of core mould, it is tight by core mould upper cover plate
Be compacted for soluble core material by fixing bolt；
2）Core solidifies：By step 1）Core mould after middle compacting is solidified in being put into baking oven, and solidification temperature is 100 ~ 140
DEG C, hardening time is 1 ~ 3h, is cooled to less than 60 DEG C and opens the baking oven taking-up core mould；
3）Core is sealed：The core mould of taking-up is sealed with surface sealer, it is stand-by.
3. the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core according to claim 2, its
It is characterised by, the step（2）Middle SQRTM molding process is to replace dry fibers preform with a prepreg overlay,
Prepreg overlay is laid in core mould, and closes core mould, then resin is injected into the core mould,
The step（3）The demoulding is comprised the following steps that：
（A）Prepreg overlay：The carbon fiber prepreg paving of designated shape will be cut into soluble mandrel surface, paving is finished
After carry out vacuum preloading reality, vacuum pressure >=920mbar；
（B）Matched moulds：The carbon fiber prepreg laying that pre-compacted is crossed is placed on the locating clamp plate in core mould, and surrounding is put into
Positioning press strip, then the mold of core mould is covered, mold is locked by bolt；
（C）Injecting glue：Connection glue injection pipeline heats core mould simultaneously, when core mold temperature reaches injecting glue temperature, starts note
Glue simultaneously provides injection pressure；
（D）Solidification：After injecting glue terminates, firing equipment presses resin curing conditions and sets elevated cure, and solidification temperature is 170 ~ 200
DEG C, hardening time is 1 ~ 3h.
4.（E）The demoulding：Treat that core mould cools to less than 60 DEG C, soluble core is dissolved with running water, until solvable
Property core dissolving finish, obtain grid product.
5. the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core according to claim 2, its
It is characterised by, the carbon fiber prepreg is twills carbon fiber prepreg or/and unidirectional carbon prepreg.
6. the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core according to claim 4, its
It is characterised by, resin used by injecting glue is same resin with prepreg resin.
7. the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core according to claim 5, its
It is characterised by, the curved surface cell structure form that obtained grid product is hyperbolicity, muscle in length and breadth is interlocked.
8. the preparation method of the SQRTM moulding process carbon fiber grilles based on water-soluble core according to claim 6, its
It is characterised by, the step（C）In the injection pressure be 2 ~ 6bar.
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