CN116852757B - Vacuum auxiliary injection molding method for composite material based on pressure cooperation - Google Patents
Vacuum auxiliary injection molding method for composite material based on pressure cooperation Download PDFInfo
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- CN116852757B CN116852757B CN202311133038.1A CN202311133038A CN116852757B CN 116852757 B CN116852757 B CN 116852757B CN 202311133038 A CN202311133038 A CN 202311133038A CN 116852757 B CN116852757 B CN 116852757B
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- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000001746 injection moulding Methods 0.000 title claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 154
- 229920005989 resin Polymers 0.000 claims abstract description 154
- 239000000835 fiber Substances 0.000 claims abstract description 77
- 239000000463 material Substances 0.000 claims abstract description 58
- 239000003292 glue Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 238000005056 compaction Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 239000004744 fabric Substances 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012783 reinforcing fiber Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000012779 reinforcing material Substances 0.000 abstract description 3
- 229940088594 vitamin Drugs 0.000 abstract description 2
- 229930003231 vitamin Natural products 0.000 abstract description 2
- 235000013343 vitamin Nutrition 0.000 abstract description 2
- 239000011782 vitamin Substances 0.000 abstract description 2
- 150000003722 vitamin derivatives Chemical class 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 25
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a vacuum auxiliary injection molding method of a composite material based on pressure synergy, and belongs to the technical field of composite material molding. The molding method comprises the steps of paving a vitamin reinforcing material, packaging a vacuum bag, vacuumizing the inside of the vacuum bag, vacuumizing the outside of the vacuum bag, defoaming a resin system, injecting glue, compacting and solidifying by positive pressure glue discharging. According to the invention, the air is exhausted by vacuumizing in the vacuum bag, and then vacuumizing outside the vacuum bag, so that the external pressure applied to the fiber reinforced material is reduced by the synergistic effect of the pressure outside the vacuum bag and the pressure inside the vacuum bag, the fiber reinforced material is in a relatively fluffy state, the permeability of the fiber reinforced material is improved, the rate of impregnating the fiber reinforced material by a resin system is increased, the production efficiency is improved, and the fiber reinforced material is impregnated more completely. In addition, in the positive pressure glue discharging compaction process, the fiber volume fraction of the composite material is further improved through the synergistic effect of the outside of the vacuum bag and the pressure in the vacuum bag, so that the mechanical property of the composite material is further improved.
Description
Technical Field
The invention belongs to the technical field of composite material molding, and particularly relates to a vacuum auxiliary injection molding method of a composite material based on pressure cooperation.
Background
Vacuum assisted injection molding (VARI) is widely used in the manufacture of composite parts as a representative composite liquid molding process. In the process of vacuum assisted injection molding (VARI), a fiber reinforcement is first laid on a mold, then a vacuum bag or flexible vacuum film is laid, and then air in the vacuum bag is pumped out using a vacuum pump to form a vacuum negative pressure environment. Resin pipelines penetrating through the vacuum bag are laid in the vacuum auxiliary injection molding system in advance, a certain pressure difference exists between the resin system tank outside the vacuum bag and the vacuum bag, and under the action of the pressure difference, resin in the resin system tank is pushed to be injected into the vacuum bag, so that fiber reinforced materials are soaked. And after the fiber reinforced material is fully soaked by the resin, curing to finally form a composite material product.
In the process of vacuum auxiliary injection molding, the inside of the vacuum bag is always in a vacuum negative pressure environment, the outside of the vacuum bag is in atmospheric pressure, the maximum value of the pressure difference between the inside and the outside of the vacuum bag is 0.1MPa under the vacuum effect, and the vacuum bag compresses the fiber reinforced materials under the effect of the pressure difference between the inside and the outside, so that the fiber reinforced materials are arranged very tightly. However, closely packed fibrous reinforcement may reduce its permeability, thereby impeding the wetting of the fibrous reinforcement by the resin system, reducing the rate at which the resin system wets the fibrous reinforcement or making the wetting incomplete. Firstly, the process time is prolonged, and the production efficiency is affected; secondly, as the maximum value of the pressure difference between the inside and outside of the vacuum bag is only 0.1MPa, the further compaction of the fiber reinforced material cannot be promoted, and the fiber volume fraction of the formed composite material is lower, so that the mechanical property of the composite material is affected.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings of the prior art, the present invention provides a vacuum assisted injection molding method for composite materials based on pressure synergy, which can improve the performance of the composite material product and the molding efficiency.
The invention provides a vacuum auxiliary injection molding method of a composite material based on pressure synergy, which comprises the following steps:
paving fiber reinforced materials and packaging by a vacuum bag;
the fiber reinforced material is paved on a forming die, then an optional release cloth, an optional flow guide net, an optional airfelt and a resin pipeline are paved, a vacuumizing pipeline is paved, and then the vacuum bag is packaged.
B, vacuumizing the vacuum bag;
vacuumizing the vacuum bag, and keeping the vacuum degree at-0.1 MPa.
C, vacuumizing outside the vacuum bag;
vacuumizing the outside of the vacuum bag, and keeping the vacuum degree at-0.05 MPa to-0.09 MPa.
D, defoaming a resin system;
vacuumizing the resin system tank, keeping the vacuum degree at-0.1 MPa, and defoaming the resin system.
E, injecting glue;
and injecting resin into the vacuum bag until the resin is completely soaked in the reinforcing fiber material to be paved, and stopping injecting glue.
F, positive pressure glue discharging is compact;
and after the glue injection binding is started, before solidification, stopping vacuumizing the outside of the vacuum bag, applying positive pressure to the outside of the vacuum bag, simultaneously stopping vacuumizing the inside of the vacuum bag, keeping the pressure outside the vacuum bag at 0.3-0.6 MPa, and performing glue discharging compaction.
G, curing;
and heating the die to finish the curing and forming of the composite material.
Preferably, the pressure outside the vacuum bag is kept no less than the pressure inside the resin system tank during the E-shot step.
Preferably, after the defoaming of the resin system is completed and before the glue injection, the vacuum degree of the resin system tank is adjusted to be minus 0.05MPa to minus 0.09MPa.
Preferably, a resin discharge line is provided around the fiber reinforced material, and the resin discharge line is connected to the resin buffer tank.
Preferably, positive pressure is maintained applied to the outside of the vacuum bag during the G curing step.
Preferably, in the step of vacuumizing in the B vacuum bag, before the vacuum degree reaches-0.1 MPa in the vacuumizing process, the positions of folds of the vacuum bag are continuously adjusted, so that the vacuum bag is completely attached to the die or the fiber reinforced material.
Preferably, the vacuum degree in the vacuum bag is kept at-0.1 MPa for 10-20 min, and then the step of vacuumizing outside the vacuum bag C is carried out.
Preferably, in the step E, the resin is stopped when it enters the first vacuuming line from within the vacuum bag, indicating that the resin is fully impregnated with the reinforcing fibre material lay-up.
Preferably, the resin buffer tank is connected to the first evacuation pipe.
The beneficial effects of the invention include:
the invention relates to a vacuum auxiliary injection molding method of a composite material based on pressure synergy, which comprises the steps of paving a vitamin reinforcing material, packaging a vacuum bag, vacuumizing the vacuum bag, defoaming a resin system, injecting glue, compacting and solidifying by positive pressure glue discharging. In the step of vacuumizing in the vacuum bag, keeping the vacuum degree in the vacuum bag to be-0.1 MPa, and discharging air in the vacuum bag and the fiber reinforced material paving layer; and then vacuumizing outside the vacuum bag, keeping the vacuum degree to be minus 0.05MPa to minus 0.09MPa, and reducing the external pressure exerted by the fiber reinforced material in the vacuum bag and the external pressure exerted by the fiber reinforced material through the synergistic effect of the external pressure and the internal pressure of the vacuum bag, wherein the fiber reinforced material is in a relatively fluffy state, so that the flowing resistance of the resin system among the fiber reinforced materials is reduced, the permeability is improved, the rate of the resin system infiltrating the fiber reinforced material is increased, the production efficiency can be improved on one hand, the resin system is more completely infiltrated into the fiber reinforced material on the other hand, and the mechanical property of the composite material can be improved.
After the glue is injected and before solidification, the invention adds the step of positive pressure glue discharging compaction. The positive pressure glue discharging compaction is to apply positive pressure outside the vacuum bag, the external pressure further compresses the fiber reinforced material through the synergistic effect of the pressure outside the vacuum bag and the pressure inside the vacuum bag, redundant resin is extruded and discharged from the inside of the composite material, the fiber volume fraction of the composite material is further improved, and the mechanical property of the composite material after curing and forming is further improved.
Drawings
FIG. 1 is a process flow diagram of one embodiment of a pressure synergy-based composite vacuum assisted injection molding method;
FIG. 2 is a schematic diagram of a composite vacuum assisted injection molding system based on pressure synergy;
wherein, the label is as follows:
1. a pressure control system; 2. a vacuum bag; 3. a flow guiding net; 4. a forming die; 5. a fibrous reinforcing material; 6. a first vacuum line; 7. a second vacuumizing pipeline; 8 resin injection pipelines; 9. a resin system tank; 10. a resin buffer tank.
Detailed Description
In the following description, certain specific details are included to provide a thorough understanding of various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other methods, components, materials, etc.
Unless otherwise required by the present invention, the words "comprise" and "comprising" are to be interpreted in an open, inclusive sense, i.e. "including but not limited to.
Reference throughout this specification to "one embodiment" or "an embodiment" or "one preferred embodiment" or "certain embodiments" means that a particular reference element, structure, or feature described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" or "in a preferred embodiment" or "in certain embodiments" appearing in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular elements, structures, or features may be combined in any suitable manner in one or more embodiments.
The invention provides a vacuum auxiliary injection molding method of a composite material based on pressure synergy, which comprises the following steps:
a, paving fiber reinforced materials 5 and packaging by a vacuum bag 2;
the fibre reinforcement 5 is laid on the forming mould 4, then the optional release cloth, the optional flow net 3, the optional airfelt and the resin pipeline are laid, and the evacuation pipeline is laid, then the vacuum bag 2 is encapsulated.
Specifically, as shown in fig. 2, the forming die 4, the fiber-reinforced material 5, the optional release fabric, the optional guide wire 3, the optional airfelt and the vacuum bag 2 are positioned in the pressure control system 1, and the vacuum bag 2 encapsulates the fiber-reinforced material 5, the optional release fabric, the optional guide wire 3 and the optional airfelt on the forming die 4 and is positioned in the vacuum bag 2. If the vacuum bag 2 is optimized as a vacuum bag 2 with a release cloth function, a release cloth may not be used. The diversion net 3 is used for diversion of resin, so that the resin flows more uniformly.
The resin pipeline comprises a resin injection pipeline 8 and a resin discharge pipeline, one end of the resin injection pipeline 8 is connected with the bottom of the resin system tank 9, and the other end of the resin injection pipeline 8 is paved in the vacuum bag 2.
The vacuumizing pipeline comprises a first vacuumizing pipeline 6, one end of the first vacuumizing pipeline 6 is paved in the vacuum bag 2, the other end of the first vacuumizing pipeline 6 is connected with a vacuum pump, and the pressure in the vacuum bag 2 is controlled through the first vacuumizing pipeline 6. The pressure outside the vacuum bag 2 is controlled by a pressure control system 1.
B, vacuumizing the vacuum bag 2;
the resin injection line 8 and the resin discharge line were closed, and then the vacuum bag 2 was evacuated to maintain the vacuum degree at-0.1 MPa.
Specifically, when the vacuum bag 2 is vacuumized, the air in the vacuum bag 2 and the fiber reinforced material 5 are discharged under the action of the vacuum, and the vacuum degree in the vacuum bag 2 is kept at-0.1 MPa. At this time, the pressure difference between the outside of the vacuum bag 2 and the inside of the vacuum bag 2 is 0.1MPa, and the vacuum bag 2 tightly compresses the fiber-reinforced material 5, so that the fiber-reinforced material 5 is compressed relatively tightly.
Vacuumizing outside the vacuum bag 2;
and vacuumizing the outside of the vacuum bag 2 through the pressure control system 1, and keeping the vacuum degree at-0.05 MPa to-0.09 MPa.
Specifically, vacuum is pumped out of the vacuum bag 2, the vacuum degree is kept at-0.05 MPa to-0.09 MPa, at the moment, the pressure difference between the outside of the vacuum bag 2 and the inside of the vacuum bag 2 is reduced to 0.01MPa to 0.05MPa, the pressure applied to the fiber reinforced material 5 is reduced, and the fiber reinforced material 5 is in a relatively fluffy state. At this point the vacuum bag 2 is still fully attached to the fibre reinforcement 5 and the mould. The forming of a resin flow channel between the forming die 4 and the vacuum bag 2 can be avoided, the disordered flow of the resin is avoided, the resin waste is caused, and the influence on the forming quality of the composite material product is avoided.
Due to the reduced applied pressure on the fibre reinforcement 5, the tightness of the arrangement of the fibre reinforcement 5 is reduced, the permeability of the fibre reinforcement 5 is increased, facilitating the flow and infiltration of resin in the fibre reinforcement 5 ply.
D, defoaming a resin system;
before glue injection, the resin system tank 9 is vacuumized, the vacuum degree is kept at-0.1 MPa, and the resin system is defoamed.
In the invention, the vacuumizing pipeline further comprises a second vacuumizing pipeline 7, one end of the second vacuumizing pipeline 7 is connected with the resin system tank 9, the other end of the second vacuumizing pipeline 7 is connected with another vacuum pump, and the pressure in the resin system tank 9 is controlled through the second vacuumizing pipeline 7. At this time, the resin injection line 8 is in a closed state.
E, injecting glue;
and opening a resin injection pipeline 8, injecting resin into the vacuum bag 2 until the resin completely infiltrates the reinforcing fiber material layer, and stopping injecting the glue.
Specifically, the resin injection pipeline 8 is opened, the pressure in the resin system tank 9 is kept to be larger than the pressure in the vacuum bag 2, the pressure difference pushes the resin to flow, the resin is injected into the vacuum bag 2, and the fiber reinforced material 5 is infiltrated. And closing the resin injection pipeline 8 until the resin completely infiltrates the fiber reinforced material 5, and stopping injecting the glue.
F, positive pressure glue discharging is compact;
after the glue injection binding, before solidification, stopping vacuumizing the outside of the vacuum bag 2, applying positive pressure to the outside of the vacuum bag 2, stopping vacuumizing the inside of the vacuum bag 2, keeping the pressure outside the vacuum bag 2 at 0.3-0.6 MPa, and opening a resin discharge pipeline to discharge glue.
In the prior art, no positive pressure is applied outside the vacuum bag 2. Before the resin system infiltrates the fiber reinforcement 5, the pressure applied by the vacuum bag 2 is applied to the fiber reinforcement 5, and during the resin system infiltrates the fiber reinforcement 5, the applied pressure is borne by the resin system and the fiber reinforcement 5 together, and under the condition that the applied pressure is unchanged, the pressure directly acting on the fiber reinforcement 5 is reduced, and the arrangement tightness of the fiber reinforcement 5 is reduced. On the one hand, the cured composite material has larger resin content and smaller fiber volume content, and further, the composite material has relatively lower performance. On the other hand, in the process of impregnating the fiber reinforcement 5 with the resin system, although the degree of tightness of the arrangement of the fiber reinforcement 5 impregnated with the resin system is reduced, the degree of tightness of the arrangement of the fiber reinforcement 5 which is not impregnated is not changed, and thus, the impregnation speed of the fiber reinforcement 5 by the resin system flow front cannot be improved.
In the invention, after the glue injection is finished, the resin injection pipeline 8 is closed, the resin discharge pipeline is opened, positive pressure is applied outside the vacuum bag 2 through the pressure control system 1, meanwhile, the first vacuumizing pipeline 6 is closed, and the whole system is not vacuumized. The external pressure of the vacuum bag 2 is kept to be more than 0.3MPa. At this time, the pressure difference between the outside of the vacuum bag 2 and the inside of the vacuum bag 2 is much greater than 0.1MPa. The applied pressure will further compress the fibre reinforced material 5, squeezing excess resin out of the interior of the composite material and out of the resin discharge line. As the excess resin is discharged, the fiber volume content gradually increases, and as the applied pressure matches the applied pressure that the fiber reinforcement 5 can assume due to the compressed state, the fiber reinforcement 5 is not compressed, and the resin is not discharged, reaching a steady state. In the process, the fiber volume fraction of the composite material is increased, so that the mechanical property of the composite material after curing and forming is effectively improved.
G, curing;
and heating the die to finish the curing and forming of the composite material.
Specifically, after the resin completely infiltrates the fiber reinforced material 5, the curing parameters matched with the resin are determined according to the properties of the resin, so that the curing and forming of the composite material are completed.
In a preferred embodiment of the invention, in the F positive pressure glue discharging compaction step, the pressure outside the vacuum bag is kept at 0.4-0.5 MPa.
In a preferred embodiment of the present invention, to ensure that the resin flows only in a predetermined area, the vacuum bag is not lifted, and the pressure outside the vacuum bag is maintained not less than the pressure inside the resin system tank 9 during the E-injection step.
In a preferred embodiment of the invention, after the resin system is defoamed, and before the glue injection, the vacuum degree of the resin system tank 9 is adjusted to be-0.05 MPa to-0.09 MPa. Therefore, the pressure in the vacuum bag is smaller than the pressure in the resin system tank 9 during the injection, and the resin smoothly flows into the vacuum bag under the action of the pressure difference.
In the prior art vacuum assisted injection molding method, air bubbles are involved in the mixing process of the multicomponent resin system, and if the fiber reinforcement 5 is directly injected, the cured composite product has void defects therein, which will affect the performance of the composite product. In the prior art, the mixed resin system is usually subjected to off-line vacuum defoaming treatment, but for the resin system with high reactivity, the resin system is easy to start to solidify in the defoaming process, so that the defoaming treatment time is generally short, the defoaming cannot be effectively completed, and the resin system still contains bubbles.
In the prior art, if an on-line vacuum degassing treatment is used, a theoretical vacuum is applied to the resin system liquid level in the resin system tank 9, and when a pressure difference cannot be formed, the resin cannot be injected into the vacuum bag to infiltrate the fiber reinforced material 5. Therefore, in the process of injecting the glue, the vacuum degree in the resin system tank 9 can be reduced only, so that the pressure difference of the flowing of the resin system is ensured, and on one hand, the vacuum degree in the resin system tank 9 is too low to achieve the effect of on-line defoaming; on the other hand, the vacuum degree in the resin system tank 9 is too high, the pressure difference of the flowing of the resin system is small, and the flowing power of the resin is small; and when the vacuum bag tightly compresses the fiber reinforced material 5, the resistance of resin flow is further increased, so that the speed of the resin system for infiltrating the fiber reinforced material 5 is reduced, and the production efficiency of the composite material product is seriously affected.
In the invention, the resin system tank 9 is vacuumized to a vacuum degree of-0.1 MPa, and the vacuum degree of the resin system tank 9 is adjusted to be-0.05 MPa to-0.09 MPa after the resin system is defoamed. At this time, the pressure difference between the inside of the resin system tank 9 and the inside of the vacuum bag is greater than 0.01MPa, and the pressure outside of the vacuum bag is not less than the pressure inside the resin system tank 9. The resin system tank 9 and the pressure outside the vacuum bag cooperate to ensure that the resin flows only in a predetermined area and the vacuum bag is not supported; the resin system tank 9 and the pressure in the vacuum bag cooperate to enable the resin to smoothly flow into the vacuum bag under the action of pressure difference; simultaneously, the pressure in the vacuum bag is cooperated with the pressure outside the vacuum bag, the pressure of the vacuum bag to the fiber reinforced material 5 is reduced, the flow resistance of the resin in the vacuum bag is reduced, the infiltration speed of the resin to the fiber reinforced material 5 is improved, the production efficiency is improved, and the infiltration quality is ensured.
In a preferred embodiment of the present invention, the resin discharge line is provided around the fiber reinforced material 5, and the resin discharge line is connected to the resin buffer tank 10.
In the present invention, the resin discharge line is provided around the fiber reinforced material 5 to further facilitate the discharge of the resin, and the resin buffer tank 10 is provided outside the pressure control system to receive the discharged surplus resin.
In a preferred embodiment of the invention, positive pressure is maintained applied to the outside of the vacuum bag during the G curing step.
In a preferred embodiment of the invention, in the step of evacuating the B vacuum bag, the position of the folds of the vacuum bag is continuously adjusted before the vacuum degree reaches-0.1 MPa in the evacuating process, so that the vacuum bag is completely attached to the forming die 4 and the fiber reinforced material 5.
In the invention, in the process of vacuumizing the vacuum bag, before the vacuum degree reaches-0.1 MPa, the positions of folds of the vacuum bag are continuously adjusted to ensure that the vacuum bag is completely attached to the die or the fiber reinforced material 5 in order to avoid bridging of the vacuum bag in the region with a complex die structure.
In a preferred embodiment of the invention, the step of vacuumizing outside the vacuum bag C is performed after the vacuum degree in the vacuum bag is kept at-0.1 MPa for 10-20 min.
In the invention, in order to ensure that the air in the fiber reinforced material 5 is discharged more completely, the vacuum degree in the vacuum bag is kept at-0.1 MPa for 10-20 min, and then the step of vacuumizing outside the vacuum bag is carried out.
In a preferred embodiment of the invention, in the E-shot step, the resin is said to completely infiltrate the fibre reinforcement material 5 and stop the shot when it enters the first evacuation line 6 from within the vacuum bag.
Preferably, in order to prevent the resin from possibly entering the vacuum pump and damaging the vacuum pump, the resin buffer tank 10 is connected to the first vacuumizing line 6. Specifically, the resin buffer tank 10 is a sealed tank, the first vacuumizing pipeline 6 is communicated with the resin buffer tank 10, and then the resin buffer tank 10 is communicated with a vacuum pump.
In a preferred embodiment of the present invention, as shown in fig. 1, the molding method includes the steps of:
a, paving fiber reinforced materials 5 and packaging by a vacuum bag;
the fiber reinforcement 5 is laid on the forming die 4, then an optional release cloth, an optional flow net, an optional airfelt and a resin pipeline are laid, and a vacuumizing pipeline is laid, and then a vacuum bag is encapsulated.
B, vacuumizing the vacuum bag;
vacuumizing the vacuum bag, and keeping the vacuum degree in the vacuum bag at-0.1 MPa.
C, vacuumizing outside the vacuum bag;
vacuumizing the outside of the vacuum bag, and keeping the vacuum degree of the outside of the vacuum bag at-0.05 MPa to-0.09 MPa.
D, defoaming a resin system;
before glue injection, vacuumizing a resin system tank 9, keeping the vacuum degree at-0.1 MPa, and defoaming a resin system;
after the defoaming is completed, the vacuum degree of the resin system tank 9 is adjusted to be minus 0.05MPa to minus 0.09MPa, and the pressure outside the vacuum bag is kept not smaller than the pressure in the resin system tank 9.
E, injecting glue;
opening a resin injection pipeline 8, injecting resin into the vacuum bag until the resin completely infiltrates the fiber reinforced material 5, and stopping injecting glue;
during the injection process, the pressure outside the vacuum bag is kept at a value not smaller than the pressure inside the resin system tank 9.
F, positive pressure glue discharging is compact;
after the glue injection beam is injected, before solidification, vacuum pumping outside the vacuum bag is stopped, positive pressure is applied to the outside of the vacuum bag, then vacuum pumping inside the vacuum bag is stopped, the pressure outside the vacuum bag is kept at 0.3-0.6 MPa, and glue discharging is performed.
G, curing;
and heating the die, and keeping applying positive pressure to the outside of the vacuum bag to finish the curing and forming of the composite material.
In the invention, the steps A, B, C, E, F and G are sequentially carried out, and the step D is completed before the step E.
According to the forming method, through the cooperation of the pressure in the vacuum bag and the pressure outside the vacuum bag and the cooperation of the pressure in the resin system tank 9 and the pressure in the vacuum bag, the infiltration speed of a resin system can be effectively improved, the forming efficiency can be improved, and the infiltration of the resin to the fiber reinforced material can be more complete; in addition, positive pressure is applied outside the vacuum bag, so that positive pressure glue discharging compaction is performed, the fiber volume fraction of the composite material is further improved, and the product performance of the composite material is further improved.
Claims (8)
1. The vacuum-assisted injection molding method for the composite material based on pressure cooperation is characterized by comprising the following steps of:
paving fiber reinforced materials and packaging by a vacuum bag;
paving fiber reinforced materials on a forming die, paving optional release cloth, optional flow guide net, optional airfelt and resin pipelines, paving a vacuumizing pipeline, and packaging a vacuum bag;
b, vacuumizing the vacuum bag;
vacuumizing the vacuum bag, and keeping the vacuum degree at-0.1 MPa;
c, vacuumizing outside the vacuum bag;
vacuumizing the outside of the vacuum bag, and keeping the vacuum degree at-0.05 MPa to-0.09 MPa;
d, defoaming a resin system;
vacuumizing the resin system tank, keeping the vacuum degree at-0.1 MPa, and defoaming the resin system;
e, injecting glue;
injecting resin into the vacuum bag until the resin is completely soaked in the reinforcing fiber material to be paved, and stopping injecting glue;
in the E glue injection step, the pressure in the vacuum bag is kept smaller than the pressure in the resin system tank, and the pressure outside the vacuum bag is kept not smaller than the pressure in the resin system tank, so that the resin can flow only in a preset area and the vacuum bag is not supported;
f, positive pressure glue discharging is compact;
after the glue injection binding is started, before solidification, stopping vacuumizing the outside of the vacuum bag, applying positive pressure to the outside of the vacuum bag, simultaneously stopping vacuumizing the inside of the vacuum bag, keeping the pressure outside the vacuum bag at 0.3-0.6 MPa, and performing glue discharging compaction;
g, curing;
and heating the die to finish the curing and forming of the composite material.
2. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
after the defoaming of the resin system is completed and before the glue injection, the vacuum degree of the resin system tank is adjusted to be minus 0.05MPa to minus 0.09MPa.
3. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
the resin discharge pipeline is arranged around the fiber reinforced material and is connected with the resin buffer tank.
4. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
during the G curing step, positive pressure was maintained outside the vacuum bag.
5. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
in the step of vacuumizing in the vacuum bag B, before the vacuum degree reaches-0.1 MPa in the vacuumizing process, the positions of folds of the vacuum bag are continuously adjusted, so that the vacuum bag is completely attached to a die or a fiber reinforced material.
6. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
and (3) maintaining the vacuum degree in the vacuum bag at-0.1 MPa for 10-20 min, and then vacuumizing the outside of the vacuum bag C.
7. The pressure synergy based vacuum assisted injection molding method of composite material of claim 1, wherein:
in the step E, when the resin enters the first vacuumizing pipeline from the vacuum bag, the resin is completely infiltrated into the reinforcing fiber material layer, and the glue injection is stopped.
8. The pressure synergy based vacuum assisted injection molding method of composite material of claim 7, wherein:
the resin buffer tank is connected to the first vacuumizing pipe.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825797A (en) * | 2012-08-30 | 2012-12-19 | 内蒙古金岗重工有限公司 | Large-scale composite wind blade forming process |
| CN105881932A (en) * | 2014-11-20 | 2016-08-24 | 北京玻钢院复合材料有限公司 | Method for forming large-sized composite material box |
| CN115257010A (en) * | 2022-07-14 | 2022-11-01 | 中南大学 | Pressure regulation and control device for enhancing VARTM (vacuum assisted transfer molding) process and application method thereof |
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2023
- 2023-09-05 CN CN202311133038.1A patent/CN116852757B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825797A (en) * | 2012-08-30 | 2012-12-19 | 内蒙古金岗重工有限公司 | Large-scale composite wind blade forming process |
| CN105881932A (en) * | 2014-11-20 | 2016-08-24 | 北京玻钢院复合材料有限公司 | Method for forming large-sized composite material box |
| CN115257010A (en) * | 2022-07-14 | 2022-11-01 | 中南大学 | Pressure regulation and control device for enhancing VARTM (vacuum assisted transfer molding) process and application method thereof |
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