CN109834957A - A kind of forming method and its molding die of prepreg - Google Patents
A kind of forming method and its molding die of prepreg Download PDFInfo
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- CN109834957A CN109834957A CN201711212491.6A CN201711212491A CN109834957A CN 109834957 A CN109834957 A CN 109834957A CN 201711212491 A CN201711212491 A CN 201711212491A CN 109834957 A CN109834957 A CN 109834957A
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- pressure
- air bag
- prepreg
- former
- formpiston
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Abstract
The present invention provides a kind of forming method of prepreg and its molding dies, it is vacuumized by utilizing, remove residual air, small molecule, infiltrate resin distribution uniformly, sufficiently, and the supplementary means also using Guan Bi mould, internal airbag as compacting prepreg, since air bag expands after being filled with pressure flow body, in hot briquetting, prepreg can be made to obtain uniform pressure in all directions, obtain compacting to improve the performance of prepreg.In addition, making the abundant wetting fibre of resin by setting gradient pressure and temperature, the poor resin phenomenon such as bridge formation, hickie, starved can be effectively improved.For the present invention in sealed mold internal pressurization, controllability is strong, while improving composite molding can effectively save cost, free from environmental pollution, expand use scope.More importantly, since mold designability is strong, pressure air bag morphotropism is good, temperature, pressure control precision is high, the composite product that structure is complicated and fiber content is high can be made.
Description
Technical field
The present invention relates to field shaping techniques, specifically, the forming method and its molding die of a kind of prepreg.
Background technique
Prepreg be with resin matrix impregnating continuous fibres or fabric under conditions of strict control, be made resin matrix with
The composition of reinforcement, be manufacture composite material intermediate materials, can be directly used for manufacturing various composite elements, therefore,
Its quality good or not is directly related to the quality of composite material, and the forming method of prepreg also directly influences the matter of prepreg
Amount is therefore, most important to the research of prepreg forming method.
Currently, various disadvantages are still had in the various forming methods of prepreg, for example, Qiu Qiyan etc. " is being eliminated compound
The mold and method of material autoclave female mould forming corner defects " in using corner addition with expansion character gasket come
Autoclave female mould forming corner regions are eliminated to build bridge and groove mark defect, but in this method, due to different location, different-thickness pad
Piece thermal expansion coefficient is different, it is difficult to control the bulbs of pressure, and for complicated turning, need complicated shape gasket, expanded by heating
It is also easy to produce deformation, to influence turning prepreg curing molding.Zhu family waits use in " compression moulding method for prepreg " by force
It is covered with silica gel piece in the upper mold of mold, in lower die or in upper and lower mould, internal pressure is generated using silica gel piece expanded by heating, makes to presoak
Material obtains pressure, but in this method, phenomena such as there is only silica gel piece differential expansions, prepreg unbalance stress, and
Interior side draw is easy to produce for curved surface, is not suitable for complex component.Therefore, a kind of at low cost, simple process and made is developed
Standby prepreg forming method of good performance has a very important significance.
Summary of the invention
For the problems in the relevant technologies, the present invention has studied the forming method and its molding die of a kind of prepreg, with
A kind of at low cost, simple process and prepared prepreg forming method of good performance are provided.
The forming method of prepreg provided by the invention, comprising: step S1: prepreg is coated on formpiston, and is had
The former of air bag molds, and forms sealed mold；Step S2: the sealed mold is vacuumized；And step S3: to the preimpregnation
Material applies external pressure and heats, and solidifies, and demoulding obtains molding prepregs.
In above-mentioned forming method, in the step S1, the prepreg is between the formpiston and the air bag.
In above-mentioned forming method, the side that the formpiston and the air bag are contacted with the prepreg has been coated with demoulding
Cloth.
In above-mentioned forming method, the step S2 includes: to be vacuumized using vacuum pump to the sealed mold ,-
0.95Bar or less vacuumizes at least 15min.
In above-mentioned forming method, the air bag is applied by the fluid flow port being passed through pressure flow body in the former
Add external pressure to realize and apply external pressure to the prepreg.
In above-mentioned forming method, the step S3 includes: that the air bag is forced into first using pressure flow body to preset
Pressure P1, while the sealed mold is heated to preset temperature T, heat-insulation pressure keeping continues growing pressure in the air bag extremely
Second preset pressure P2, solidify, demoulding obtains the molding prepregs, wherein the pressure of the pressure flow body is 50
~70psi, the first preset pressure P1For 90~100psi, the second preset pressure P2It is described pre- for 180~200psi
If temperature T is 55~65 DEG C.
In above-mentioned forming method, the described the step of sealed mold is heated to preset temperature T includes: will be described close
Envelope mold is heated to 25~35 DEG C of temperature, and heat-insulation pressure keeping is again heated to the preset temperature T later.
Described that the sealed mold is heated to preset temperature T in above-mentioned forming method, heat-insulation pressure keeping continues growing
Pressure in the air bag is to the second preset pressure P2The step of include: that the sealed mold is heated to 25~35 DEG C of temperature,
Heat-insulation pressure keeping continues growing pressure in the air bag to 140~160psi；It is again heated to the preset temperature T later, keeps the temperature
Pressure maintaining continues growing pressure in the air bag to the second preset pressure P2。
A kind of molding die for above-mentioned forming method, comprising: formpiston, prepreg are coated on the formpiston；Former,
Include: fluid flow port, be located in the former and air bag, the air bag is identical with the shape of the former, and described in being attached to
On former, wherein the air bag is connected to by the fluid flow port with outside air, and is applied by the fluid flow port to the air bag
Plus-pressure.
Further include vacuum port in above-mentioned molding die, be located in the formpiston, in the former and formpiston conjunction
After mould, vacuumized between mold and the prepreg.
In above-mentioned molding die, the air bag and the former pass through sealing glue connection.
The present invention removes residual air, small molecule using vacuumizing, and infiltrates resin distribution uniformly, sufficiently, and also adopt
Guan Bi mould, the supplementary means of internal airbag as compacting prepreg is used to add since air bag expands after being filled with pressure flow body
In thermoforming, prepreg is made to obtain uniform pressure in all directions, is compacted.In addition, passing through setting gradient pressure and temperature
Degree, makes the abundant wetting fibre of resin, can be effectively improved the poor resin phenomenon such as bridge formation, hickie, starved.The present invention is in sealed mold
Portion's pressurization, controllability is strong, can effectively save cost, free from environmental pollution, expansion use scope while improving composite molding.
More importantly, since mold designability is strong, pressure air bag morphotropism is good, temperature, pressure control precision is high, structure can be made
Complicated and high fiber content composite product.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of molding die according to an embodiment of the present invention, wherein 1 indicates formpiston, and 2 indicate former,
3 indicate air bag, and 4 indicate fluid flow port.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
The forming method of prepreg provided by the invention, comprising the following steps:
Step S1: prepreg is coated on formpiston, is molded with the former with air bag, sealed mold is formed.In the step
In rapid, the formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by air bag and
Former sealing glue connection, forms the space of a sealing, and be enclosed with release cloth on air bag, prepreg is then pressed laying work
Skill is required to cut, is coated on the formpiston with release cloth, is finally molded, and sealed mold is formed, and after molding, prepreg is located at sun
Between mould and air bag, and the side that formpiston and air bag are contacted with prepreg has been coated with release cloth.
Step S2: sealed mold is vacuumized.In this step, sealed mold is vacuumized using vacuum pump ,-
0.95Bar or less vacuumizes at least 15min, removes the air between mold and prepreg.
Step S3: applying external pressure to prepreg and heat, solidify, and demoulding obtains molding prepregs.At this
In step, air bag application external pressure applies prepreg to realize by the way that pressure flow body is passed through the fluid flow port in former
Add external pressure, wherein a fluid flow port can be set, pressure flow body is flowed by the fluid flow port, flows out air bag, can also set
At least two fluid flow ports are set, for pressure flow body by different fluid flow port inflow and outflow air bags, and wherein, pressure flow body includes nitrogen
Gas, air etc..In this step, air bag is forced into the first preset pressure 90 using the pressure flow body that pressure is 50~70psi
~100psi, while sealed mold is heated to 55~65 DEG C of preset temperature with 0.5~2 DEG C/min, heat-insulation pressure keeping 40~
50min, resin sufficiently infiltrate；Pressure in air bag is continued growing to second 180~200psi of preset pressure, by cure profile plus
Mold, resin solidification are heated seal, demoulding processing obtains molding prepregs.Temperature can also be used in above-mentioned steps
Gradient carrys out heat seal dies, using the pressure flow body that pressure is 50~70psi by air bag be forced into the first preset pressure 90~
Sealed mold is heated to 25~35 DEG C of temperature, 10~15min of heat-insulation pressure keeping with 0.5~2 DEG C/min by 100psi, later again with
0.5~2 DEG C/min is heated to 55~65 DEG C of preset temperature, and 30~35min of heat-insulation pressure keeping, resin sufficiently infiltrates；Continue growing gas
Pressure in capsule is to second 180~200psi of preset pressure, by above-mentioned temperature gradient heat seal dies, resin solidification, demoulding
Processing, obtains molding prepregs.Pressure can also be applied to air bag using barometric gradient in above-mentioned steps, utilized
Pressure is that air bag is forced into first 90~100psi of preset pressure by the pressure flow body of 50~70psi, by sealed mold with 0.5~
2 DEG C/min is heated to 25~35 DEG C of temperature, 10~15min of heat-insulation pressure keeping；Continue growing pressure in air bag to 140~
160psi, is heated to 55~65 DEG C of preset temperature, 30~35min of heat-insulation pressure keeping again later with 0.5~2 DEG C/min, and resin is abundant
Infiltration；The pressure in air bag is continued growing to second 180~200psi of preset pressure, by cure profile heating mould, resin is solid
Change, demoulding processing obtains molding prepregs.Increase temperature gradient, barometric gradient in above-mentioned steps, by temperature ladder
Degree, barometric gradient heat-insulation pressure keeping, can be further improved the infiltration degree of resin, product can be made closer, so as to
In the product of manufacture labyrinth.
In the present invention, by having the air bag of one layer of docile therewith on former, air bag is filled with after pressure flow body can be with
The expansion of the interior shape of former and formpiston generates a uniform positive pressure to prefabricated component, furthermore vacuumizes again to Guan Bi mould, formed
Negative pressure, under the action of high positive pressure and negative pressure, prefabricated component compacting, resin sufficiently infiltrates, then through hot setting, is made and mold shape
The consistent product of shape.More importantly, gradual staged pressure and temperature can be used in curing molding method, allows resin in molten condition
Retention time is long, pressure is big, is thoroughly impregnated reinforcing material, can avoid hickie and Gan Qu, and can effectively improve Coating combination
Intensity.
Embodiment 1
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.95Bar vacuumize 15min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 70psi
Air bag is forced into the first preset pressure 100psi；Sealed mold is heated to 60 DEG C of preset temperature with 1 DEG C/min, heat-insulation pressure keeping
40min, resin sufficiently infiltrate；Pressure in air bag is continued growing to the second preset pressure 180psi；Add by above-mentioned temperature gradient
Mold heat, resin solidification, demoulding processing obtain molding prepregs.
Embodiment 2
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.90Bar vacuumize 20min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 50psi
Air bag is forced into the first preset pressure 90psi, sealed mold is heated to 25 DEG C of temperature with 0.5 DEG C/min, heat-insulation pressure keeping
10min is heated to 65 DEG C of preset temperature again later with 0.5 DEG C/min, and heat-insulation pressure keeping 35min, resin sufficiently infiltrates；It continues growing
Pressure in air bag is to the second preset pressure 200psi, by above-mentioned temperature gradient heat seal dies, resin solidification, at demoulding
Reason, obtains molding prepregs.
Embodiment 3
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.85Bar vacuumize 30min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 60psi
Air bag is forced into the first preset pressure 95psi, sealed mold is heated to 35 DEG C of temperature with 2 DEG C/min, heat-insulation pressure keeping 15min；
Pressure in air bag is continued growing to 160psi, is heated to 55 DEG C of preset temperature, heat-insulation pressure keeping 30min again later with 2 DEG C/min,
Resin sufficiently infiltrates；Pressure in air bag is continued growing to the second preset pressure 190psi, by above-mentioned temperature gradient heating mould,
Resin solidification, demoulding processing, obtains molding prepregs.
Embodiment 4
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.95Bar vacuumize 20min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 65psi
Air bag is forced into the first preset pressure 90psi, sealed mold is heated to 25 DEG C of temperature with 1.5 DEG C/min, heat-insulation pressure keeping
12min；The pressure in air bag is continued growing to 140psi, is heated to 65 DEG C of preset temperature again later with 1.5 DEG C/min, heat preservation is protected
32min is pressed, resin sufficiently infiltrates；The pressure in air bag is continued growing to the second preset pressure 200psi, by above-mentioned temperature gradient
Heating mould, resin solidification, demoulding processing obtain molding prepregs.
Embodiment 5
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.95Bar vacuumize 20min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 70psi
Air bag is forced into the first preset pressure 100psi, sealed mold is heated to 30 DEG C of temperature with 0.5 DEG C/min, heat-insulation pressure keeping
15min；The pressure in air bag is continued growing to 150psi, is heated to 60 DEG C of preset temperature again later with 0.5 DEG C/min, heat preservation is protected
35min is pressed, resin sufficiently infiltrates；The pressure in air bag is continued growing to the second preset pressure 180psi, by above-mentioned temperature gradient
Heating mould, resin solidification, demoulding processing obtain molding prepregs.
Embodiment 6
The formpiston, former and air bag identical with former shape of mold are manufactured according to the shape of product first, by gas
Capsule and former sealing glue connection, form the space of a sealing, and wrap up release cloth on air bag, prepreg are then pressed laying
Technique is required to cut, is coated on the formpiston with release cloth, and molding forms sealed mold；Sealed mold is taken out with vacuum pump true
Sky, -0.95Bar vacuumize 25min, remove the air between mold and prepreg, will using the pressure flow body that pressure is 50psi
Air bag is forced into the first preset pressure 100psi, sealed mold is heated to 30 DEG C of temperature with 1 DEG C/min, heat-insulation pressure keeping 10min；
Pressure in air bag is continued growing to 160psi, is heated to 60 DEG C of preset temperature, heat-insulation pressure keeping 30min again later with 1 DEG C/min,
Resin sufficiently infiltrates；Pressure in air bag is continued growing to the second preset pressure 200psi, by above-mentioned temperature gradient heating mould,
Resin solidification, demoulding processing, obtains molding prepregs.
The present invention removes residual air, small molecule using vacuumizing, and infiltrates resin distribution uniformly, sufficiently, and also adopt
Guan Bi mould, the supplementary means of internal airbag as compacting prepreg is used to add since air bag expands after being filled with pressure flow body
In thermoforming, prepreg can be made to obtain uniform pressure in all directions, be compacted.In addition, passing through setting gradient pressure
And temperature, make the abundant wetting fibre of resin, the poor resin phenomenon such as bridge formation, hickie, starved can be effectively improved.The present invention is in sealed mould
Has internal pressurization, controllability is strong, and the effectively save cost of energy, free from environmental pollution while improving composite molding, expanding makes
Use range.More importantly, it since mold designability is strong, pressure air bag morphotropism is good, temperature, pressure control precision is high, can make
Obtain the composite product that structure is complicated and fiber content is high.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of forming method of prepreg characterized by comprising
Step S1: prepreg is coated on formpiston, is molded with the former with air bag, sealed mold is formed；
Step S2: the sealed mold is vacuumized；And
Step S3: applying external pressure to the prepreg and heat, solidify, and demoulding obtains molding prepregs.
2. preparation method according to claim 1, which is characterized in that in the step S1, the prepreg is located at institute
It states between formpiston and the air bag.
3. preparation method according to claim 1, which is characterized in that the formpiston and the air bag connect with the prepreg
The side of touching has been coated with release cloth.
4. forming method according to claim 1, which is characterized in that the step S2 includes: using vacuum pump to described
Sealed mold vacuumizes, and at least 15min is vacuumized below -0.95Bar.
5. forming method according to claim 1, which is characterized in that by being passed through pressure flow body in the former
Fluid flow port to the air bag apply external pressure come realize to the prepreg apply external pressure.
6. forming method according to claim 1, which is characterized in that the step S3 includes: using pressure flow body by institute
It states air bag and is forced into the first preset pressure P1, while the sealed mold is heated to preset temperature T, heat-insulation pressure keeping continues to increase
Add pressure in the air bag to the second preset pressure P2, solidify, demoulding obtains the molding prepregs, wherein institute
The pressure for stating pressure flow body is 50~70psi, the first preset pressure P1For 90~100psi, the second preset pressure P2
It is 55~65 DEG C for 180~200psi, the preset temperature T.
7. forming method according to claim 6, which is characterized in that described that the sealed mold is heated to preset temperature
The step of T includes: that the sealed mold is heated to 25~35 DEG C of temperature, and heat-insulation pressure keeping is again heated to the default temperature later
Spend T.
8. forming method according to claim 6, which is characterized in that described that the sealed mold is heated to preset temperature
T, heat-insulation pressure keeping continue growing pressure in the air bag to the second preset pressure P2The step of include: by the sealed mold
It is heated to 25~35 DEG C of temperature, heat-insulation pressure keeping continues growing pressure in the air bag to 140~160psi；It reheats later
To the preset temperature T, heat-insulation pressure keeping continues growing pressure in the air bag to the second preset pressure P2。
9. a kind of molding die for forming method according to any one of claims 1 to 8 characterized by comprising
Formpiston, prepreg are coated on the formpiston；
Former, comprising:
Fluid flow port is located in the former, and
Air bag, the air bag is identical as the shape of the former, and is attached on the former,
Wherein, the air bag is connected to by the fluid flow port with outside air, and is applied by the fluid flow port to the air bag
Pressure.
10. molding die according to claim 9, which is characterized in that further include vacuum port, is located in the formpiston, with
After the former and formpiston molding, vacuumized between mold and the prepreg.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711212491.6A CN109834957A (en) | 2017-11-28 | 2017-11-28 | A kind of forming method and its molding die of prepreg |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711212491.6A CN109834957A (en) | 2017-11-28 | 2017-11-28 | A kind of forming method and its molding die of prepreg |
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| CN109834957A true CN109834957A (en) | 2019-06-04 |
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ID=66879501
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Cited By (1)
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| CN112721238A (en) * | 2021-01-14 | 2021-04-30 | 辽宁通用航空研究院 | Preparation method of variable-thickness composite material workpiece |
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