CN109822933B - Magnetic field auxiliary pressurizing method for composite material structure forming - Google Patents
Magnetic field auxiliary pressurizing method for composite material structure forming Download PDFInfo
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- CN109822933B CN109822933B CN201910225155.8A CN201910225155A CN109822933B CN 109822933 B CN109822933 B CN 109822933B CN 201910225155 A CN201910225155 A CN 201910225155A CN 109822933 B CN109822933 B CN 109822933B
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- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000000465 moulding Methods 0.000 claims abstract description 25
- 239000006247 magnetic powder Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000012783 reinforcing fiber Substances 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 2
- 229920001567 vinyl ester resin Polymers 0.000 claims description 2
- 239000012792 core layer Substances 0.000 claims 2
- 238000003825 pressing Methods 0.000 claims 2
- 238000005516 engineering process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of composite material structure forming, and provides a magnetic field auxiliary pressurizing method for composite material structure forming, which comprises the following steps of firstly, laying magnetic powder in a hollow mold for composite material structure forming; then, arranging a magnetic field in the whole structure, so that the magnetic powder provides a supporting force for the die and strengthens the structure; and finally, after the composite material structure is cured, removing the magnetic force, reducing the mold, and demolding the member to obtain the composite material member with more excellent performance. The method lays the magnetic powder in a hollow mold to form an adjustable mold with supporting force, so that the magnetic force can be conveniently controlled after the composite material structure is cured and molded, and the demolding process is simplified. Compared with the traditional method for molding the composite material structure by adopting a hard mold, the invention aims at the complex structure, does not need to specially arrange a demolding mechanism, simplifies the design of the mold and reduces the molding cost. Provides a certain feasible method for the forming process of the complex structure.
Description
Technical Field
The invention relates to a magnetic field auxiliary pressurizing method for composite material structure molding, in particular to an auxiliary action method in processes such as contact molding, mold hot-press molding, vacuum auxiliary molding and the like.
Background
Composite materials are materials with excellent properties composed of two or more materials of different properties on a macroscopic scale by physical and chemical means. The sandwich structure such as corrugation and lattice made of the fiber reinforced composite material combines light materials and light structures, has light weight, high specific strength, high specific rigidity and multiple functions of easily realizing bearing, thermal control, energy absorption and energy storage by using an internal open and through space, and is a typical material-structure integrated high-performance component. The sandwich structure is a three-dimensional structure formed by connecting an upper panel, a lower panel and a middle core structure, and has various forms and wide application range by changing the structure of the core. Such as aircraft wings, empennages, fuselages, floors and automobile bodies, chassis, etc
The composite material forming process needs a mould to ensure the structural overall dimension, and simultaneously transmits external pressure to improve the mechanical property of the composite material, the preparation technology of the composite material structure comprises a mould hot-pressing one-step forming technology, a mould hot-pressing secondary forming technology, a vacuum auxiliary forming technology, a contact forming technology and the like, when the technology is used for forming a complex structure such as a corrugated plate, the mould design and manufacture are complex, demoulding is not easy, the forming quality is difficult to control, interface defects, geometric dimension defects and the like are easy to occur, integrated forming is not easy, meanwhile, different moulds are needed when different size series configurations are faced, and the problems of high cost, long production cycle time and the like are caused. These molding processes have difficulty meeting the ever-increasing demands for high-performance complex components in the future.
Disclosure of Invention
The invention aims to solve the problem that the existing mold for the molding process of the composite material structure cannot meet the engineering requirements when facing a complex structure, and provides a method for adding magnetic powder into a cavity of the mold and utilizing a magnetic field to assist in pressurization, so that the size design precision of the mold is simplified according to a magnetic force controllable method, the design period is shortened, and the molding cost of the composite material structure is reduced.
The technical scheme of the invention is as follows:
a magnetic field auxiliary pressurizing method for composite material structure molding comprises the following steps:
(1) laying magnetic powder in a hollow mould of a molding composite material structure, wherein the magnetic powder has uniform particle size and is convenient to tile, and the quantity of the magnetic powder is changed according to the size of the mould;
(2) laying a composite material panel to be formed;
(3) applying a magnetic field around the composite material to be molded through a flat electromagnetic device, wherein magnetic lines of force penetrate through the composite material and provide auxiliary supporting force for the composite material;
adjusting the magnetic field by changing the position of the electromagnetic device;
(4) after the molding, the magnetic field is removed, and the demolding is completed.
The reinforcing fiber in the fiber reinforced resin matrix composite material is glass fiber, carbon fiber or aramid fiber.
The resin is epoxy resin, unsaturated polyester resin, vinyl ester resin or bismaleimide resin.
The composite material forming process comprises a low-pressure contact forming process, a die hot-press forming process and a vacuum auxiliary forming process.
The invention has the beneficial effects that: compared with the traditional composite material structure forming process method, the method has the advantages that the magnetic powder is added into the composite material forming die, the magnetic field force is utilized to support the die, the size design precision of the die is simplified, the demolding process is simplified, a special method is not needed for demolding, the magnetic field is only required to be removed, and the process flow is simplified.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention; n, S and arrows indicate magnetic fields and magnetic field line directions, 1 a mould for forming a lower panel, 2 a lower panel of a corrugated plate made of composite materials, 3 a corrugated core made of composite materials, 4 an upper panel of a corrugated plate made of composite materials, and 5 a mould for forming an upper panel; 6-12 moulds for forming corrugated cores.
Fig. 2 is a schematic view of a single mold for forming a corrugated core according to an embodiment of the present invention, in which the inner hollow core can be filled with magnetic powder, and the black dots indicate the magnetic powder. By adding the magnetic field, the position of the magnetic powder in the die is changed, and the forming supporting force is provided for the die.
Fig. 3 is a schematic view of a mold assembling process according to an embodiment of the invention.
Fig. 4 is an isometric view of an embodiment of the invention, showing clearly the combination of the mold and the composite structure after mold closing.
Detailed Description
The following is a clear and complete description of the technical solutions according to the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 to 4 are schematic structural views of the present invention.
A composite corrugated plate is selected to illustrate a specific process, and the specific implementation mode is as follows:
step one, blanking: the required composite material facing is prepared according to the composite material corrugated plate structure to be formed.
Step two, mould treatment: and (3) coating a mold with a release agent, and filling magnetic powder into the bottom of the hollow corrugated core mold. Different requirements are required for different release agents, it is recommended to leave the mold for a certain period of time after application and then apply the release agent again to the mold.
Thirdly, laying a mold 1 for forming a lower panel, laying a composite corrugated plate lower panel 2 on the basis, sequentially placing molds 6-9 for forming a corrugated core on the composite corrugated plate lower panel 2, and finally laying a composite corrugated core 3. The specific process is shown in fig. 3.
The panel is a non-metal material plate, such as a composite material plate, a plastic plate, a rubber plate and the like made of fiber reinforced organic polymer materials. The mould can be the combined material forming die, and inside hollow places the magnetic, combines magnetic force, can provide the mould of inside holding power, and at actual forming process, the demand of combination design, the pertinence provides the holding power to the weak link, and is specific to adjust through the direction in magnetic field.
And step four, after the composite material corrugated core body 3 is laid, putting the composite material corrugated core body into a mold 10-12 for molding the corrugated core body. Then, an upper panel 4 of a corrugated plate made of a composite material is laid, a mold 5 for molding the upper panel is placed, the whole mold is pressurized, and a magnetic field is set. The schematic after clamping is shown in fig. 4.
Magnetic powder with magnetism, under the effect of magnetic force, can remove in the inside production of mould, again because the restriction of mould, can give holding power of sandwich layer and panel, including the pressure that wholly provides, the power that sandwich layer and panel received can concentrate more, plays and carries out the effect of supplementing to the weak place of atress in the buckled plate.
And step five, after the corrugated plate is integrally cured, removing the magnetic field, and facilitating demolding.
The magnetic field can adopt a flat electromagnetic device, and aiming at the problems that large-size composite materials and complex configurations are difficult to form and easily cause structural defects, the method utilizes a magnetic field auxiliary pressurization mode to adjust the supporting force, thereby reducing the demoulding difficulty and the manufacturing cost of complex structures.
During demoulding, the magnetic field is firstly removed, then the mould 5 for forming the upper panel is taken away, and the moulds 6-12 for forming the corrugated core body are sequentially taken out. And finally, taking away the die 1 for forming the lower panel to obtain the complete composite material corrugated plate structure.
For purposes of clarity, the present invention is described in terms of a corrugated structure, only the dies 6-12 that form the corrugated core are described. The corrugation dimensions may vary and are not limited to the several molds that form the corrugated core. When the mold is released, the magnetic powder in the mold can be poured out, so that the cyclic utilization is realized.
Claims (5)
1. A magnetic field auxiliary pressurizing method for composite material structure molding is characterized by comprising the following steps:
(1) laying magnetic powder in a hollow mould of a molding composite material structure, wherein the magnetic powder has uniform particle size and is convenient to tile, and the quantity of the magnetic powder is changed according to the size of the mould;
magnetic powder with magnetism moves in the die under the action of magnetic force, and because of the limitation of the die, a supporting force is provided for the core layer and the panel, and the pressure provided by the whole body is added, so that the force borne by the core layer and the panel can be more concentrated, and the effect of supplementing the weak-stressed place in the corrugated plate is achieved;
(2) laying a composite panel to be formed, wherein the composite panel comprises an upper panel and a lower panel, in the laying process, firstly laying a mold for forming the lower panel, laying the lower panel on the basis of the mold for forming the lower panel, then placing a plurality of hollow molds on the lower panel, then laying a composite corrugated core, after laying the composite corrugated core, then placing the composite corrugated core into the plurality of hollow molds, then laying the upper panel, and placing the mold for forming the upper panel on the upper panel;
(3) applying a magnetic field around the composite material to be molded through a flat electromagnetic device, wherein magnetic lines of force penetrate through the composite material and provide auxiliary supporting force for the composite material;
(4) after the molding, the magnetic field is removed, and the demolding is completed.
2. The magnetic field assisted forcing method of claim 1, wherein the magnetic field is adjusted by changing a position of the electromagnetic device.
3. The magnetic field assisted forcing method of claim 1 or 2, wherein the composite material comprises reinforcing fibers and a resin;
the reinforced fiber is glass fiber, carbon fiber and/or aramid fiber;
the resin is epoxy resin, unsaturated polyester resin, vinyl ester resin or bismaleimide resin.
4. The magnetic field assisted pressing method according to claim 1 or 2, wherein the molding process of the composite material is a low pressure contact molding process, a mold hot press molding process or a vacuum assisted molding process.
5. The magnetic field assisted pressing method of claim 3, wherein the molding process of the composite material is a low pressure contact molding process, a mold hot press molding process, or a vacuum assisted molding process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910225155.8A CN109822933B (en) | 2019-03-25 | 2019-03-25 | Magnetic field auxiliary pressurizing method for composite material structure forming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910225155.8A CN109822933B (en) | 2019-03-25 | 2019-03-25 | Magnetic field auxiliary pressurizing method for composite material structure forming |
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| CN109822933A CN109822933A (en) | 2019-05-31 |
| CN109822933B true CN109822933B (en) | 2020-09-11 |
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| CN114248464B (en) * | 2021-11-24 | 2022-08-26 | 威海光威复合材料股份有限公司 | Carbon fiber composite material forming device and method |
| CN115008669B (en) * | 2022-05-23 | 2024-08-02 | 江苏易塑复合新材料有限公司 | Corrugated board molding equipment and molding process thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0121919A2 (en) * | 1983-04-08 | 1984-10-17 | Siefried Henschke | Method of furnishing a construction element with a layer |
| US4675061A (en) * | 1985-09-24 | 1987-06-23 | Grumman Aerospace Corporation | Method for forming corrugated materials using memory metal cores |
| CN206781058U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of hand-operated magnetic fibrous composite shaped device |
| CN206780796U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of adjustable electromagnetism carbon fibre composite shaped device |
| CN206780802U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of carbon fiber forming magnetic case |
-
2019
- 2019-03-25 CN CN201910225155.8A patent/CN109822933B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0121919A2 (en) * | 1983-04-08 | 1984-10-17 | Siefried Henschke | Method of furnishing a construction element with a layer |
| US4675061A (en) * | 1985-09-24 | 1987-06-23 | Grumman Aerospace Corporation | Method for forming corrugated materials using memory metal cores |
| CN206781058U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of hand-operated magnetic fibrous composite shaped device |
| CN206780796U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of adjustable electromagnetism carbon fibre composite shaped device |
| CN206780802U (en) * | 2017-05-31 | 2017-12-22 | 兰州城市学院 | A kind of carbon fiber forming magnetic case |
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