CN105881932A - Method for forming large-sized composite material box - Google Patents
Method for forming large-sized composite material box Download PDFInfo
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- CN105881932A CN105881932A CN201410664963.1A CN201410664963A CN105881932A CN 105881932 A CN105881932 A CN 105881932A CN 201410664963 A CN201410664963 A CN 201410664963A CN 105881932 A CN105881932 A CN 105881932A
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Abstract
The invention discloses a method for forming a large-sized composite material box. The method includes the following steps that (1) a mold is prepared; (2) a plurality of layers including fiber materials are laid on the outer surface of the mold; (3) a vacuum system is arranged on the upper surface of the laid reinforcing material layer, and a glue inlet pipe and a glue outlet pipe are further arranged; (4) the whole device is wrapped with vacuum, vacuum pumping is conducted, and then air tightness is checked; (5) glue is prepared for mold filling; and (6) demolding is performed after curing, and the product is dressed and processed to be formed. By the adoption of the method, the content of fibers in the formed product is even in distribution, quality is reliable, and process repeatability is good. The whole process can only be completed through a vacuum pump, and no special equipment is required, so that investment is small, labor intensity is low, consumed labor hours is short and cost is low. The process belongs to mold closing forming, the amount of volatilization of harmful gas is small, environmental pollution can be reduced, the good health of operators can be guaranteed, and therefore popularization is facilitated.
Description
Technical field
The present invention relates to a kind of casing forming method, particularly relate to a kind of large-sized composite material casing molding side
Method.
Background technology
Canister launch technology can be effectively improved the storage reliability of missile weapon system because of it, have whole day
Wait the advantage such as adaptation ability and battlefield quick-reaction capability, military by current various continental rises and carrier-borne sophisticated missile
Device system uses.The core of canister launch technology and it is crucial that firing box, the Main Trends of The Development in its future it
One is exactly the miniaturization of firing box, lightweight.Since the seventies, fibrous composite is with its specific strength
Height, specific modulus height, the designability of mechanical property, damping shock absorption, endurance, ageing-resistant, moulding process
The series of advantages such as simple, obtains in fields such as Aero-Space and is widely applied.
Casing as storing firing box key component, carry contain guided missile, install finder and
Primary load bearing effect, belongs to large scale closed cross-section member.Fibre reinforced composites are used to manufacture firing box casing,
The problems such as weight big, welding deformation, easy-to-rust that metal structure casing exists can be solved well,
And the lowest production cost, open wide prospect for application on storing firing box.
Firing box mostly is the structures such as tetragon, hexagon, octagon, and the polygon goods length of side is more than 300mm,
Length 2000mm～15000mm, thickness is more than 2mm.Reinforcing material can select glass fibre, carbon fiber, height
Strong fiber, basalt fibre；Resin material can select epoxy resin, vinylite, unsaturated-resin,
The synthetic resin such as phenolic resin, polyimide resin.
The main moulding process of composite material launching box has wet method hands paste, prepreg autoclave bag pressure, fiber to be wound around
Etc. several technological formings.Wet method hand pasting forming strength of materials performance rate is the highest, anthropic factor is relatively big, causes criticizing
Production. art reliability is poor；Prepreg autoclave bag presses technique raw and auxiliary material, equipment investment higher, and cost is relatively
Greatly, especially large scale goods；Fiber winding forming needs proprietary forming frock just can realize polygon goods
Molding, the realisation complexity of technique.Vacuum assisted resin transfer molding technique (VARTM/SCRIMP) is applicable to
Prescription height, small lot and larger-size goods.The composite processed in this way, fiber contains
Amount height, Mechanical Properties of Products is excellent, and product size is unrestricted, is especially suitable for making massive article.
It is compared with traditional autoclave forming process, has die cost low, resin cold curing and hardly
The feature that restricted product size etc. are prominent.Development and the property of relevant raw and auxiliary material along with SCRIMP technique
Can improve, make SCRIMP technique have obvious advantage in terms of polygon product molding.
Summary of the invention
The purpose of the present invention is that provides a kind of large-sized composite material casing to become to solve the problems referred to above
Type method.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes that multiple layers of laying of fibrous material are set on mold outer surface, at the reinforcing material laid
Layer upper surface lays vacuum system, is distributed into sebific duct, goes out sebific duct, overall bag vacuum, evacuation, check airtight
Property, join glue mold filling (glue perfusion), the demoulding after cured, product finishing, machine-shaping.
Described vacuum perfusion process includes following step:
1) mould prepares: cleaning mould, repairs smooth, then at mould surface spraying hole sealing agent and releasing agent.
2) lay reinforcing material: the reinforcing material that drying processes is laid on mould.
3) the auxiliary material of lay: be sequentially placed release cloth, perforated membrane on reinforcing material.
4) perfusion system is laid on described layers of reinforcement surface；If this perfusion system includes permeable formation
Dry bar runner and the gum-injecting port communicated with runner；Wherein, permeable formation is at least 1 layer and has Thief zone function
Flow-guiding screen；Some runner is laid on this flow-guiding screen；
5) in step 4) the perfusion system exterior surface laid is sealed and coated with at least one of which vacuum bag thin film, institute
State the edge of vacuum bag thin film and post sealing joint strip with described die joint joint, by vacuum bag film edge with
Described die joint closely bonds, and makes the die cavity between ground floor vacuum bag thin film and mould constitute a vacuum-pumping
Sealing space；Again the vacuum bag thin film at described gum-injecting port is pierced through, expose this gum-injecting port outside, with dress
Valvular injected rubber hose connects；
6) step 5) described in vacuum port connected by the vacuum pump of connected vacuum tube and peripheral hardware, open
Dynamic vacuum pump is by step 5) described in sealing space in be evacuated shape, make die sealing airtight, work as vacuum
Degree closes vacuum pump, pressurize 15min after reaching-0.090MPa～-0.1MPa, period vacuum allows drop-out value
Less than 50mbar；
7) be again turned on step 6) vacuum pump, described sealing space under the effect of negative pressure, glue mix
Thing flow to each position of described perfusion system after injecting and be full of described runner by described injected rubber hose, and
Gradually impregnate described layers of reinforcement, until after being impregnated with completely, stopping injecting glue.
Specifically, according to step 7) described in glue mold filling step be:
A) take quantitative resin mixture liquor by technological requirement to load in container；
B) by step 3) in be placed in the container equipped with glue mixture with valvular injected rubber hose, open note
Valve on sebific duct, glue mixture is directed under atmospheric pressure as in the sealing space of negative pressure；
C) when described glue mixture in steps 4) described in vacuum port when overflowing, determine this glue mixture
Layers of reinforcement described in thorough impregnation；The valve being then shut off on injected rubber hose, mold filling terminates.
Further, described solidification, the demoulding and deburring: solidify according to curing process, it is cooled to after solidification
Room temperature, tears described release cloth, perforated membrane, flow-guiding screen, vacuum bag film, runner and the note equipped with injected rubber hose off
Jiao Kou；Then carry out deburring, carry out post-treatment and assembling, obtain square chest goods.
Further, described reinforcing material includes reinforcing fiber and strengthens foam, and described reinforcing fiber is glass
One or more of fiber, carbon fiber, basalt fibre or organic fiber, organic fiber is selected from supra polymer
One or more in polyethylene fibre, aramid fiber.
Further, the form of described reinforcing fiber is plain cloth, twills, satin fabric, unidirectional knits
One or more of thing, multi-axial tricot etc..
Further, described foam is cork wood, PVC foam, PMI foam, the one of PU rigid foam or many
Kind.
Further, described resin is epoxy resin, vinylite, unsaturated-resin, phenolic resin.
The beneficial effects of the present invention is:
The present invention is compared with existing moulding process, and the fiber content of SCRIMP technological forming product is evenly distributed,
Reliable in quality, good process repeatability；Whole process has only to vacuum pump and can complete, and is not required to task equipment,
Small investment, labor intensity is low, and the man-hour of cost is less, and cost is relatively low, and this technique belongs to closed moulding, has
Evil gaseous volatilization is few, can reduce environmental pollution, can ensure again the health of operator, benefit popularization.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
The invention will be further described below:
Fill as it is shown in figure 1, the present invention describes vacuum in detail below by the moulding process of tetragon firing box
Note technique, its moulding process comprises the following steps, shown in its technological process Fig. 1:
1) mould prepares: with ethanol by die surface wiped clean, then at mould surface spraying15 Sealer hole sealing agents and release 818 releasing agent.
2) lay reinforcing material: the reinforcing material that drying processes is laid on mould, enhancing material therein
Expect to form by being laid in glass fiber cloth, cork wood, PVC cystosepiment and PU cystosepiment successively.Concrete paving
Putting forward sequence is: first lay 4-20 layer glass fiber cloth, optimal lay 10 layers；Then knit at glass fibre
Lay cork wood, PVC cystosepiment and PU cystosepiment in a conventional manner above thing, repave the glass putting 4-20 layer
Glass fabric, optimal lay 10 layers.
3) the auxiliary material of lay: the 85PA release cloth cut is laid on reinforcing material, is then sequentially placed
Perforated membrane and airfelt etc..
4) flow-guiding screen and flow-guiding channel are arranged: step 3) outer surface laying perfusion system；This perfusion system bag
Include permeable formation, some runners and the gum-injecting port communicated with runner；Wherein, permeable formation is at least 1 layer of tool
There is the flow-guiding screen of Thief zone function；Some runner is laid on this flow-guiding screen；
5) in step 4) the perfusion system exterior surface laid is sealed and coated with at least one of which vacuum bag thin film, institute
State the edge of vacuum bag thin film and post sealing joint strip with described die joint joint, by vacuum bag film edge with
Described die joint closely bonds, and makes the die cavity between ground floor vacuum bag thin film and mould constitute a vacuum-pumping
Sealing space；Again the vacuum bag thin film at described gum-injecting port is pierced through, expose this gum-injecting port outside, with dress
Valvular injected rubber hose connects；
6) evacuation perfusion: bleeding point is connected with vacuum pump, then evacuation and check sealing die cavity gas
Close property.Take quantitative resin mixture liquor by technological requirement to load in container；By step 3) the valvular injecting glue of middle band
Pipe is placed in the container equipped with glue mixture, opens the valve on injected rubber hose, and glue mixture is at atmospheric pressure
Effect under be directed into as in the sealing space of negative pressure；When described glue mixture in steps 4) described in true
When eating dishes without rice or wine to overflow, determine this layers of reinforcement described in glue mixture thorough impregnation；It is then shut off injecting glue
Valve on pipe, mold filling terminates.
7) solidification, the demoulding and deburring: solidify according to curing process, molding must be kept in solidification process
Vacuum in die cavity is until completion of cure.Room temperature, the then demoulding and deburring it is cooled to after solidification.The side of obtaining
To product.
For the ease of product stripping, in above-mentioned steps 2) described in flow-guiding screen and described layers of reinforcement between by
Under supreme be equipped with release cloth and perforated membrane successively；Wherein, surface activity is little, resistance to bond is strong in release cloth selection
Tetrafluoroethene or nylon material；Perforated membrane selects vistanex plastic sheeting with holes, Kong Jingwei 1.1mm；
Flow-guiding screen selects the Web materials with Thief zone characteristic, lays 1-2 layer；
In order to ensure the air-tightness of whole vacuum system, the present invention also can be in step 3) described in vacuum bag thin
Double vacuum system is used, i.e. at perfusion system exterior surface 2 layers of vacuum bag thin film of cladding, i.e. in step during film molding
Rapid 4) the 1st layer of vacuum bag thin film outer surface which floor airfelt of lay in length and breadth in；Second layer vacuum bag film edge
Bonding with the outer side seal of described die joint；Complete ground floor vacuum bag thin film and second layer vacuum bag thin film it
Between constitute second vacuum-pumping sealing space；Relative to double vacuum systems, on die joint along it,
Outer ring offers 2 circle vacuum ports, and wherein, inner ring vacuum port is opened in inside this die joint, outer ring vacuum port
It is opened in outside this die joint.
Above-described embodiment is presently preferred embodiments of the present invention, is not the restriction to technical solution of the present invention；
As long as the technical scheme that can realize on the basis of above-described embodiment without creative work, all should regard
In the range of falling into the rights protection of patent of the present invention.
Claims (7)
1. a large-sized composite material casing forming method, it is characterized in that: include that multiple layers of laying of fibrous material are set on mold outer surface, vacuum system is laid at the layers of reinforcement upper surface laid, it is distributed into sebific duct, goes out sebific duct, overall bag vacuum, evacuation, inspection air-tightness, join glue mold filling (glue perfusion), the demoulding after cured, product finishing, machine-shaping.
Described vacuum perfusion process includes following step:
1) mould prepares: cleaning mould, repairs smooth, then at mould surface spraying hole sealing agent and releasing agent.
2) lay reinforcing material: the reinforcing material that drying processes is laid on mould.
3) the auxiliary material of lay: be sequentially placed release cloth, perforated membrane on reinforcing material.
4) perfusion system is laid on described layers of reinforcement surface；This perfusion system includes permeable formation, some runners and the gum-injecting port communicated with runner；Wherein, the flow-guiding screen of permeable formation to be at least 1 layer have Thief zone function；Some runner is laid on this flow-guiding screen；
5) in step 4) the perfusion system exterior surface laid is sealed and coated with at least one of which vacuum bag thin film, sealing joint strip is posted in the edge of described vacuum bag thin film and described die joint joint, vacuum bag film edge is closely bonded with described die joint, makes the die cavity between ground floor vacuum bag thin film and mould constitute the sealing space of a vacuum-pumping；Again the vacuum bag thin film at described gum-injecting port is pierced through, expose this gum-injecting port outside, connect with filling valvular injected rubber hose；
6) step 5) described in vacuum port connected by the vacuum pump of connected vacuum tube and peripheral hardware, start vacuum pump by step 5) described in sealing space in be evacuated shape, make die sealing airtight, vacuum pump is closed after vacuum reaches-0.090MPa～-0.1MPa, pressurize 15min, period vacuum allows drop-out value less than 50mbar；
7) be again turned on step 6) vacuum pump, described sealing space is under the effect of negative pressure, glue mixture flow to each position of described perfusion system after injecting and be full of described runner by described injected rubber hose, and gradually impregnate described layers of reinforcement, until after being impregnated with completely, stopping injecting glue.
A kind of large-sized composite material casing forming method the most according to claim 1, it is characterised in that: according to step 7) described in glue mold filling step be:
A) take quantitative resin mixture liquor by technological requirement to load in container；
B) by step 3) in be placed in the container equipped with glue mixture with valvular injected rubber hose, open the valve on injected rubber hose, glue mixture is directed under atmospheric pressure as in the sealing space of negative pressure；
C) when described glue mixture in steps 4) described in vacuum port when overflowing, determine this layers of reinforcement described in glue mixture thorough impregnation；The valve being then shut off on injected rubber hose, mold filling terminates.
A kind of large-sized composite material casing forming method the most according to claim 2, it is characterized in that: described solidification, the demoulding and deburring: solidify according to curing process, it is cooled to room temperature after solidification, tears described release cloth, perforated membrane, flow-guiding screen, vacuum bag film, runner and the gum-injecting port equipped with injected rubber hose off；Then carry out deburring, carry out post-treatment and assembling, obtain square chest goods.
A kind of large-sized composite material casing forming method the most according to claim 3, it is characterized in that: described reinforcing material includes reinforcing fiber and strengthens foam, described reinforcing fiber is one or more of glass fibre, carbon fiber, basalt fibre or organic fiber, one or more in ultra high molecular polyethylene fiber, aramid fiber of organic fiber.
A kind of large-sized composite material casing forming method the most according to claim 4, it is characterised in that: the form of described reinforcing fiber is one or more of plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot etc..
A kind of large-sized composite material casing forming method the most according to claim 5, it is characterised in that: described foam be cork wood, PVC foam, PMI foam, PU rigid foam one or more.
A kind of large-sized composite material casing forming method the most according to claim 6, it is characterised in that: described resin is epoxy resin, vinylite, unsaturated-resin, phenolic resin.
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| CN201410664963.1A CN105881932A (en) | 2014-11-20 | 2014-11-20 | Method for forming large-sized composite material box |
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| CN201410664963.1A CN105881932A (en) | 2014-11-20 | 2014-11-20 | Method for forming large-sized composite material box |
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