The forming method of carbon fiber productTechnical field
The present invention relates to carbon fiber forming fields, and in particular to a kind of forming method of carbon fiber product.
Background technique
Carbon fiber weight ratio aluminium is light, and intensity is but higher than steel, and has the advantages that corrosion-resistant, high temperature resistant, modulus are high, referred to as" king of brand-new material ".Mature moulding process mainly has four kinds of molding works such as SMC, RTM, vacuum bag pressure and autoclave at presentSkill.Wherein, most product all uses autoclave process.Different carbon fiber products when using autoclave process, method withStep is similar, be essentially all according to laying blank, vacuum bag processed, vacuum leak hunting, workpiece enter tank, open temperature program, pressurization,Heat-insulation pressure keeping, cooling, decompression shut down, workpiece go out tank sequence carry out, the main distinction is the difference of mold and according to systemPerformance needed for product and the technological parameter set.
The investment of autoclave molding method is big, at high cost, and autoclave integrates with, and complicated, cost is high, and investment is big.When using every time not onlyConsume the energy such as water, electricity, gas, it is also necessary to which vacuum bag film, inhales the auxiliary materials such as gluing, isolation cloth at sealing joint strip, makes production costIncrease by a relatively large margin.
CN201611250618.9 discloses a kind of high pressure temperature equalization system for being used to prepare carbon fiber part, and it is multiple to belong to carbon fiberCondensation material manufacturing technology field.The system includes hot blast heater, the vacuum pump being arranged in outside hot blast heater, is arranged in air blastMetal autoclave in heating furnace, the air compressor for being arranged in outside hot blast heater and being connected with metal autoclave；It is describedMetal autoclave set gradually vacuum bag, breathing cloth, isolation film and mold from outside to inside, vacuum nozzle is set on vacuum bag, veryEmpty mouth is controlled to a vacuum pump.High pressure temperature equalization system of the invention provides system by using metal autoclave and air compressor and needsThe air pressure wanted is realized without using autoclave bulky, at high cost and carries out carbon fibre material under high temperature and high pressure environmentMolding；High pressure temperature equalization system through the invention can have low cost to carbon fiber product flexibility batch micro operations, and flexibility is highFeature.
CN201010562570.1 discloses a kind of thermoforming method of co-woven continuous fiber reinforced thermoplastic structural plate,First on braider by prepreg shuffling be sheet or band-like prepreg tape；Prepreg tape is laid on mold and with vacuum bag orSealable polyester film；Then it heats up, vacuumizes, keep negative pressure of vacuum, keep the temperature one when temperature reaches the fusing point of thermoplastic resinPressure maintaining cooling molding after the section time；Vacuum bag or polyester film are finally removed, structural panel is obtained.It is produced with this shuffling methodStructural panel can drive away the air of interlayer in prepreg, and pressure is uniformly transferred by fiber, avoids and send out in machine directionRaw offset, can also further strengthen on the basis of original fiber reinforcement, cost is greatly saved.
Summary of the invention
The purpose of the invention is to overcome the above problem of the existing technology, a kind of molding of carbon fiber product is providedMethod, the better quality of the carbon fiber product of this method preparation, cost are lower.
To achieve the goals above, the present invention provides a kind of forming methods of carbon fiber product, wherein this method is in liquidIt is carried out in press, the hydraulic press includes cope plate, lower template and mold, is formed between the cope plate and the lower template closeSpace is closed, the mold is arranged in the confined space and is located in the lower template, and the cope plate is provided with gas and addsPress mouth, the lower template and the mold be provided with and vacuumize interface, and the lower template vacuumizes interface and the mouldTool vacuumizes orifice；
The described method includes: the carbon fiber Jing Guo pre-preg is placed in the mold, and vacuum bag is spread, it is true by taking outNull interface vacuumizes mold and is heated to mold, is then filled with gas to the confined space by gas pressurized mouthBody, and mold is made to continue to keep vacuum state.
Through the above technical solutions, the forming method using the application prepares carbon fiber product, have the advantage that
(1) complicated hot pressing jar structure and autoclave process are eliminated, using hydraulic press, and have can be with for the hydraulic pressThe confined space of opening and closing facilitates pick-and-place product.
(2) for SMC technique, the upper mold of mold cavity is eliminated, only retains lower die, and can vacuumize.
(3) final product quality is more preferable, and cost is lower, high-efficient.
(4) for vacuum bag pressure technique, large-scale oven is eliminated, low energy consumption.
(5) gas pressure in the confined space that the cope plate of the hydraulic press and lower template are formed can be up to 1.6Mpa,Final product quality is more stable.
Detailed description of the invention
Fig. 1 is the schematic diagram of the forming method of carbon fiber product；
Fig. 2 is the schematic diagram of molding die.
Description of symbols
1, master cylinder 2, cope plate 3, brother's woods column
4, sealing element 5, lower template 6, vacuum bag
7, carbon fiber 8, die ontology
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouchedThe specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
A kind of forming method of carbon fiber product is provided according to the present invention, wherein this method carries out in hydraulic press, instituteStating hydraulic press includes cope plate, lower template and mold, and confined space, the mould are formed between the cope plate and the lower templateTool is arranged in the confined space and is located in the lower template, and the cope plate is provided with gas pressurized mouth, the lower diePlate and the mold, which are provided with, vacuumizes interface, and the lower template vacuumize interface and the mold vacuumize interfaceConnection；
The described method includes: the carbon fiber Jing Guo pre-preg is placed in the mold, and vacuum bag is spread, it is true by taking outNull interface vacuumizes mold and is heated to mold, is then filled with gas to the confined space by gas pressurized mouthBody, and mold is made to continue to keep vacuum state.
According to the method for the present invention, after the die ontology to be carried out to vacuumize process, it is ensured that vacuum bag safely may be usedIt leans on, it is then possible to be less than the gas of 1.6MPa to the confined space charged pressure by the gas pressurized mouth, preferablyThe gas of 1.2-1.55MPa, the more preferably gas of 1.48-1.52MPa；At this point, the die ontology continues to keep vacuum shapeState, pressure maintaining allow the gas pressure (passing through vacuum bag) of confined space to be applied on carbon fiber, can make the carbon fiber product of preparationBetter quality, cost is lower.
According to the method for the present invention, the gas can be inert gas, for example, the inert gas can be for i.e.Helium(He)、Neon(Ne)、Argon(Ar), krypton (Kr), xenon (Xe) and tool are radioactiveRadon(Rn), in the present invention, it is preferred to beArgonGas.
According to the method for the present invention, the carbon fiber can be for the carbon fiber sheet by pre-preg and/or by pre-pregCarbon fiber felt, it is preferable that the carbon fiber can be in viscose glue base fiber, polyacrylonitrile-based carbon fibre and asphalt base carbon fiberIt is one or more.
According to the method for the present invention, sealing element can be set between the cope plate and the lower template, it is preferable that instituteState the sealing element that sealing element is self-sealing form.In the present invention, confined air is formed by cope plate, lower template and sealing elementBetween.
According to the method for the present invention, the cope plate, lower template can be fixedly installed, and can also be arranged with on-fixed, not hadSpecific to limit, for example, the lower template can be fixedly installed, the cope plate is set as liftable；Or it can will be describedCope plate fixed setting, the lower template are set as liftable.In the present invention, it is preferred to the lower template is fixedly installed,The cope plate is set as liftable.
Method in accordance with the invention it is preferred that while being vacuumized to mold, it can be to the cope plate and instituteIt states the confined space formed between lower template and carries out vacuumize process.
According to the method for the present invention, slide unit can also be set in the lower template, can be laid with and (puts when slide unit skids offSet) carbon fiber.
According to the method for the present invention, the molding die may include die ontology, vacuum bag and vacuum pump；Wherein, instituteState the mold cavity being formed on die ontology for placing the carbon fiber by pre-preg；In addition, the mold cavity hasWith the binding face of the carbon fiber, binding face plays supporting role to the carbon fiber.In the present invention, specifically, the mouldHaving ontology further includes matrix part and sidewall portion, and the sidewall portion is arranged in the outer edge of described matrix portion and upwardly extends, describedThe mold cavity, mold cavity approximation "u"-shaped are limited between matrix part and the sidewall portion, material carbon fiber to be laminated is putAfter entering the mold cavity, it can be bonded with the mold inner cavity surface.
Wherein, the vacuum bag can be set on the die ontology, and by using sealing structure by the vacuumBag and mold cavity sealing；Specifically, the upper surface of the sidewall portion of the vacuum bag and the mold cavity passes through sealing structureIt is tightly connected.In the present invention, for example, the sealing structure can be sealing strip, sealing structure can guarantee the vacuum bag andThe favorable sealing property in space formed between the mold cavity, so that the vacuum bag is applied to by external pressure, intoAnd apply effective pressure to the carbon fiber.That is, the vacuum bag, the carbon fiber and the mold cavity form oneThe carbon fiber is arranged between the vacuum bag and the mold cavity in other words for a so-called " sandwich " structure.
Wherein, the vacuum pump can be connected with the vacuum bag and for vacuumizing the bag vacuumDuring, vacuum bag applies a lasting pressure to material to be laminated such as carbon fiber, and can make carbon fiber surfaceWhole uniform force can obtain densely institutional framework, and then obtain good mechanical property to keep carbon fiber more closely knitEnergy.Vacuum bag is arranged on die ontology and sealed mold chamber.
According to the method for the present invention, the mold cavity can be for only with the mold cavity of lower mold, the bottom of the mold cavityPortion, which can be set, vacuumizes interface, and the interface that vacuumizes of the bottom of the mold cavity can be with the lower template of the hydraulic pressVacuumize interface be connected.
According to the method for the present invention, the condition vacuumized to the vacuum bag can be 300Pa or less, it is preferable thatVacuum degree is 100-300Pa.
According to the method for the present invention, the item confined space of the die ontology or the hydraulic press vacuumizedPart is not particularly limited.
According to the method for the present invention, this method can also include using before being filled with gas to the confined spaceElectric heater unit heats the die ontology.In addition, in the present invention, the electric heater unit is not particularly limited,For example, the electric heater unit can be heating sheet, the heating sheet is arranged on the binding face；The electric heater unit is alsoIt can be heating rod, the heating rod is built in the die ontology.It, should for traditional heat radiation heating methodThe heating efficiency of vacuum bag compression mould is higher, heating effect is more preferable.
According to the method for the present invention, the electric heater unit can be set on the die ontology and for being placed inThe carbon fiber stated on die ontology is heated；Material to be laminated such as carbon fiber has the characteristic of hot setting, therefore,By heating to carbon fiber, it can make that carbon fiber is more closely knit, mechanical property is more preferable.In the present invention, vacuum bag is to carbonFiber applies pressure, meanwhile, electric heater unit directly heats carbon fiber, and double effects act on carbon fiber, and effect is more preferable.
Wherein, the temperature measuring equipment can be used for measuring the heating temperature of the electric heater unit, to detect the heating temperatureWhether degree meets the heating process requirement of carbon fiber.
Wherein, the control device can be connected with the temperature measuring equipment and the electric heater unit respectively.Controller is realWhen monitoring temperature measuring equipment measured by temperature, when the temperature is unsatisfactory for target temperature, controller control electric heater unit adjustmentHeating temperature so that heating temperature is met the requirements, and then accelerates the curing rate of material carbon fiber to be laminated.
According to the method for the present invention, the condition heated to the die ontology can be with are as follows: heating temperature be 150 to200℃；Preferably, heating temperature is 150 DEG C.
According to the method for the present invention, the tonnage of the hydraulic press and work top are determined by the size of product.Wherein, forMassive article can take side to place the mode of mold, can reduce the size in hydraulic press workbench face in this way.
In conjunction with attached Fig. 1 and 2, preferred a kind of embodiment of the forming method of carbon fiber product according to the present invention, whereinMethod includes the following steps:
(1) carbon fiber sheet Jing Guo pre-preg and/or the carbon fiber felt Jing Guo pre-preg flat 7 are layered on the die ontologyIn 8 mold cavity, and vacuum bag 6 is set thereon；The bottom of the mold cavity is vacuumized into interface and the hydraulic pressThe interface that vacuumizes of lower template 5 is connected, and carries out vacuumize process to vacuum bag, it is ensured that vacuum bag installation is reliable；
(2) hydraulic press cope plate 2 is declined, the confined space formed with lower template accommodates molding die get up, up and downSealing element 4 between template uses self-sealing form, it is ensured that closure, wherein and the cope plate 2 is connected on master cylinder 1, andThe cope plate declines along brother woods column 3, and then contacts with the lower template, forms confined space；
(3) vacuumize process is carried out to the molding die；Also, using electric heater unit to the die ontology intoRow heating；Preferably, vacuumize process is carried out to the confined space formed between the cope plate and the lower template；
(4) after mold to be formed and vacuum degree reach technique requirement, Xiang Suoshu confined space charged pressure is less than 1.6MpaInert gas, molding die continue keep vacuum state；
(5) pressure maintaining allows the gas pressure of confined space to be applied on carbon fiber product by vacuum bag, obtains qualified systemProduct；
(6) pressure release, hydraulic press are opened, and finished product is taken out.
Using the forming method of carbon fiber product of the invention, on the one hand, during the preparation process, can be opened using hydraulic pressThe confined space closed facilitates taking-up product；The structure of autoclave complexity is eliminated, and eliminates large-scale oven, low energy consumption；SeparatelyOn the one hand, mold cavity eliminates the upper mold of product, only retains lower die, and can vacuumize, and the gas that confined space providesPressure can be up to 1.6Mpa, and final product quality is more preferable, and final product quality is more stable, and cost is lower.
The present invention will be described in detail by way of examples below.
Embodiment 1
The present embodiment indicates that the forming method of carbon fiber product of the invention.
(1) carbon fiber sheet Jing Guo pre-preg is laid in the mold cavity of the die ontology, and setting is true thereonEmpty bag；The interface that vacuumizes of the bottom of the mold cavity is connected with the interface that vacuumizes of the lower template of the hydraulic press, and rightVacuum bag carries out vacuumize process, it is ensured that vacuum bag installation is reliable；Wherein, the vacuum degree of vacuum bag is 300Pa；
(2) hydraulic press cope plate is declined, the confined space formed with lower template accommodates molding die get up, upper and lower mouldSealing element between plate uses self-sealing form, it is ensured that closure；
(3) vacuumize process is carried out to the molding die；Also, using electric heater unit to the die ontology intoRow heating, wherein heating temperature is 180 DEG C；Also, to the confined space formed between the cope plate and the lower template intoRow vacuumize process；Wherein, the vacuum degree of the die ontology is 300Pa, and the vacuum degree of the confined space B is 300Pa；
(4) after mold to be formed and vacuum degree reach technique requirement, Xiang Suoshu confined space charged pressure is less than 1.6MPaInert gas, molding die continue keep vacuum state；
(5) pressure maintaining allows the gas pressure of confined space to be applied on carbon fiber product by vacuum bag, obtains qualified systemProduct；
(6) pressure release, hydraulic press are opened, and finished product is taken out.
As a result the carbon fiber product S1 quality of finished product good prepared, it is at low cost.
Embodiment 2
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to instituteState the inert gas that confined space charged pressure is 1.5MPa.
As a result the carbon fiber product S2 quality of finished product good prepared, it is at low cost.
Embodiment 3
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to instituteState the inert gas that confined space charged pressure is 1.25MPa.
As a result the carbon fiber product S3 quality of finished product good prepared, it is at low cost.
Embodiment 4
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to instituteState the inert gas that confined space charged pressure is 1.3MPa.
As a result the carbon fiber product S4 quality of finished product good prepared, it is at low cost.
Embodiment 5
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (3), do not haveVacuumize process is carried out to the confined space formed between the cope plate and the lower template；
As a result the carbon fiber product S5 quality of finished product good prepared, it is at low cost.
Comparative example 1
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in comparative example only withMolding die prepares carbon fiber product, that is, hydraulic press is not used, specifically, method includes the following steps:
(1) carbon fiber sheet Jing Guo pre-preg is laid in the mold cavity of the die ontology, and setting is true thereonEmpty bag；And vacuumize process is carried out to vacuum bag, it is ensured that vacuum bag installation is reliable；Wherein, the vacuum degree of vacuum bag is 300Pa；
(2) vacuumize process is carried out to the molding die；Also, the die ontology is carried out using electric heater unitHeating, wherein heating temperature is 180 DEG C；Wherein, the vacuum degree of the die ontology is 300Pa；
(3) after mold to be formed and vacuum degree reach technique requirement, molding die continues to keep vacuum state；
(4) pressure maintaining allows vacuum bag to be applied on carbon fiber product, obtains product；
(5) finished product is taken out in pressure release.
As a result the carbon fiber product DS1 final product quality portion prepared is good, at high cost.
By the result of above embodiments and comparative example it can be seen that preparing carbon fiber system using the forming method of the applicationProduct have the advantage that are as follows: (a) uses hydraulic press, and the hydraulic press has the confined space that can be opened and closed, and facilitates pick-and-place product.(b) upper mold of mold cavity is eliminated, only retains lower die, and can vacuumize, final product quality is more preferable, and cost is lower.(c) liquidThe gas pressure in confined space that the cope plate and lower template of press are formed can be up to 1.6MPa, and final product quality is more stable.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the inventionIn art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any itsIts suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged toProtection scope of the present invention.