Face the technology of high-powered VARI composite material of aviation structure

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Colophony radical composite material is had because of its taller than intensity, bigger than stiffness and it is good to can design a gender one of the mainest construction material that wait for an advantage to already became the domain such as aerospace to be used extensively. But increase as dosage ceaselessly, traditional colophony base the weakness of composite material oneself also is exposed ceaselessly come out, outstanding watch is traditional now colophony radical the production cost of composite material is higher, because traditional composite material is used mostly,this basically is beforehand dip expects / autoclave shapes, beforehand the high cost that the installation cost certainly will such as the autoclave with the preparation that dip expects and microtherm deposit, multifarious process and high price creates composite material, this restricted composite material to expand of dosage further again on certain level. VARI (Vacuum Assistant Resin Infusion) namely vacuum assists colophony to permeate is to develop the low cost of a kind of composite material that rise to make a technology in recent years, its craft principle is will good according to structure and performance demand preparation fiber shapes beforehand body is placed go up in the mould, make below action of a vacuum liquid state colophony is in shape to flow inside body and infiltrate beforehand fiber, again the composite material component part that via warming up solidify, cooling drawing of patterns gets can bearing the weight of, if pursue,1 is shown. The biggest characteristic of VARI craft is whole process finish below condition of a vacuum, do not need to bring to bear on additional pressure, because this does not need autoclave, not only dispense with the investment of autoclave and equipment of form a complete set, and be shaped the restriction that the dimension of the spare parts does not accept autoclave measure, apply to especially exceed spare parts of large size composite material to shape. Can combine suture at the same time, braid etc three-dimensional the whole that enhances a method to implement complex component part shapes, reduce spare parts and fastener amount thereby, reduced fastener and assemble cost. But the characteristic of VARI craft oneself decided what to shape the fiber bulk content of the spare parts (be in commonly 50% the following) with beforehand dip expects / difference of autoclave craft existence, the application that should come true to go up in plane structure must is opposite conventional VARI technology undertakes improvement. Foreign VARI technology applies technology of circumstance abroad VARI to apply in ship vessel domain at first, because its are reducing composite material to make cost and whole of large component part,shape the respect has some advantages, in recent years relevant research organization is to VARI technology on structure of aerospace composite material feasibility respect of application already did much research work. Fourth company of horse of Losk Heed · is the earliest the research organization that uses VARI technology at plane structure, use VARI technology to shape cockpit of integral composite material, 51 spare partses adopt VARI technology in all solidify makes structure of a whole, raised integral sex of the structure effectively, reduce fastener 400, in assure to decrease the circumstance with heavy changeless efficiency to fall, cost reduces 38 ％ above. This company still cooperates with naval IPT company, the wainscot of composite material of commutate of face leaving a wing that uses VARI craft to make P-3 aircraft, and the plan expands VARI craft application to other spare parts. In addition, fourth company of horse of Losk Heed · is the application that expedites technology of VARI low cost to go up in large airlines, the experiment that has begun to develop VARI technology on the type such as C-5, C-130 at present and test and verify work [1] . In by American aerospace bureau (NASA) aid financially " Boeing shapes beforehand body " in the plan, company of V System Composites uses VARI craft to reach those who take structure of interlining of composite material of reinforcement airframe whole to shape to structure of composite material wing undertook test and verify, structure of wainscot of the whole interlining that add muscle is finished in an injection process. Additional, boeing company still uses VARI technology at the production of CH-47 part part. American Seaman company carries out " hope graceful " plan, its are main one of purposes are to use VARI craft to finish the whole of half airframe to make in an injection process. The wheat road company that incorporates with Boeing company abandoned using beforehand dip makings autoclave shapes the method of envelope of craft production wing, turn to use VARI craft to make the research of envelope of ala of large scale computer. VARI craft also gets applied in domain of other national defense. Fourth company of horse of Losk Heed · is being made " trident " IID5 is ballistic missile instrument cabin paragraph when composite material component, to reduce cost, right beforehand dip makings autoclave shapes craft, low temperature beforehand the production cost that dip expects craft reachs VARI craft to wait and composite material make a mechanical function undertake be assessmented integratedly, choose VARI finally to shape craft created module of ballistic missile instrument paragraph, realized whole to shape. With beforehand photograph of craft of dip makings autoclave compares: Spare parts gross by 61 decrease 1, fastener reduces 376, mechanical function and reduce serious effect identical (make a fiber bulk content amount to 58.

6 ％ ) , cost reduces 75 ％ . German Aerospace Center uses the method that colophony permeates, finished bubble of full measure ROHACELL to place core the development of the airframe before composite material. Provide the goods port that representative is the A400M transport that European defense company succeeds at was being developed 2007 most (if the graph is shown 2 times) this port dimension makes an appointment with 7m × 4m, be located in the sealed compartment part of airframe, because its want to bear bigger airtight load, very tall to the quality requirement of component part, the wainscot that add muscle and transverse lie between casing to use composite material design, the wainscot that add muscle shapes without the composite material that uses a convention method, mix envelope first however long joist is prefab become dry state fiber to shape beforehand body, make through VARI craft colophony infiltrates each area of envelope and long joist below vacuum action, shape in the solidify in oven next. Shape with the tradition methodological photograph is compared, did not use costly autoclave, cost is low; In the meantime, because use VARI technology to count interior the root long joist and outside envelope whole solidify, spare parts amount decreases, not only structural whole sex is tall, and when can saving about 3000 ship-fitter, shape efficiency is tall; In addition optimize a design through the structure, the goods port of A400M reduces heavy benefit very apparent also. The graph is the aileron structure that A380 uses VARI technology to shape 3 [2] . Progress of research of technology of Nextpage home VARI and applied circumstance are reducing composite material to produce the advantage that cost respect has in view of VARI technology, home begins to already many research organization began VARI technology research at the beginning of this century oneself. Aviation of boat industry Beijing creates project institute in is one of scientific research orgnaizations that home develops VARI technology and application the earliest, in special colophony system fiber of development, dry state increases to shape beforehand body permeates colophony of craft of characteristic, VARI control of going from place to place and shape the respect such as craft all began much research to work, developed BA9911, BA9912 and system of BA9914 VARI colophony, broke through complex form model shape beforehand the crucial technology such as control of flow of colophony of craft of VARI of content of body preparation, tall fiber and VARI craft, the fiber bulk content of the aviation model structural member of development achieved 58% above, undertook on many projects test and verify and outfit machine apply experimenting. Respect of system of 1 VARI special colophony (1) BA9912 epoxy resin. BA9912 is medium institute of production project of aviation of boat industry Beijing is own the epoxy resin system of the 120 ℃ solidify of research and development, viscosity of this resinous room temperature has 120mPa · S only, the requirement of craft of OK and contented VARI to matrix colophony low viscosity. The solidify temperature of BA9912 composite material is 120 ℃ , tg is 187 ℃ , quantity of the model when 82 ℃ maintains rate achieve 88% , contented use temperature the demand of construction of aviation composite material of 82 ℃ . At present this data system already was mixed in wing, aileron test and verify and application have on port structure [3] . (2) BA9914 epoxy resin. BA9914 is medium institute of production project of aviation of boat industry Beijing is own the epoxy resin system of the 180 ℃ solidify of research and development, the viscosity that 60 ℃ issue this colophony is 110mPa · S, · S of lowermost viscosity 30 MPa, can satisfy requirement of VARI craft low viscosity. BA9914 is in shape there is longer operation in the process period, can shape large component part. The Tg after solidify of standard of standard of classics of BA9914 composite material is 251 ℃ , have better hear resistance, the use that can satisfy 133 ℃ asks [4] . 2 VARI shapes craft respect is empty to boat for composite material structural member, the fiber bulk content of general requirement composite material is in 55 ％ above. Because conventional VARI technology is to be below condition of strength of a true pneumatics,shape, can't make fiber shapes beforehand the close-grained status that body achieves ideal, the fiber content of shapes VARI composite material often on the low side, this is the key that restricts VARI technology to apply on aviation structure. To satisfy the function requirement of aviation composite material, began high-powered VARI to shape technology research, optimize colophony flow path through using design, adjust colophony to enter / give the measure such as pipeline pressure, make VARI composite material is made fiber bulk content gets ameliorative, express the 1 fiber bulk content that improves around to use VARI technology to contrast. Undertake contrasting analytic by two kinds of circumstances, before ① VARI craft is improved, the circumstance of fiber bulk content of the U3160/BA9912 composite material after; The U3160/BA9912 after ② VARI craft is improved, U3160/BA9914 circumstance of content of fiber of system of two kinds of data. Mix by one-way layer pressing plate classify to layer plywood more, take measures fiber content result average, contrast of two kinds of circumstances sees a picture respectively as a result 4 with the graph 5. Can see, content of fiber of composite material of the U3160/BA9912 that after classics craft is improved, shapes, U3160/BA9914 is close to basically, achieve the fiber bulk content of 58% above. Use the U3160/BA9912 composite material that improves VARI craft to shape to compare before improving, rise about 5% the left and right sides. The cap that Nextpage uses BA9914 to shape wainscot that add muscle and large size add muscle wainscot model, farther test and verify after VARI craft is improved, be opposite the feasibility that raises content of fiber of VARI composite material. Graph 6 it is cap form test of ply of the wainscot that add muscle chooses distributinging plan, the test sees a table as a result 2. Graph 7 to add muscle wainscot model, use BA9914 to shape by VARI craft, use composite material can design a gender, the implementation structure of utmost is decreased heavy, carry circumstance envelope design to be spent for thickening according to sufferring, by fore-and-aft add muscle and transverse assemble divisional for a few area, reduce 4 kinds of ply, result of its ply test and fiber content see a table 3. Will high-powered VARI shapes technical application at U3160/BA9914 composite material mechanical function experiments the development, cap wainscot that add muscle is typical and large size adds muscle wainscot typical development, graph 8 tests data shows VARI shapes composite material panel and content of bulk of structural member fiber all achieve 58 ％ above. Conclusion although the research of domestic VARI technology starts later, but the research through nearly ten years, fasten development, complex form from special VARI resinite model shape beforehand flow of colophony of craft of body preparation, VARI controls VARI to shape craft already all gained revolutionary headway, VARI is made fiber bulk content can achieve 58% above, already approached autoclave craft level. Current, VARI composite material already had test and verify and application on many aviation structure, as the ceaseless development that test and verify works, VARI technology is sure to become afterwards beforehand dip expects / after autoclave craft another but the composite material that the project turns application makes a technology. CNC Milling CNC Machining