CN110815855A - Fiber soft mold forming method for forming composite material reinforcing rib structural part and application - Google Patents
Fiber soft mold forming method for forming composite material reinforcing rib structural part and application Download PDFInfo
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- CN110815855A CN110815855A CN201911175178.9A CN201911175178A CN110815855A CN 110815855 A CN110815855 A CN 110815855A CN 201911175178 A CN201911175178 A CN 201911175178A CN 110815855 A CN110815855 A CN 110815855A
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- Prior art keywords
- reinforcing rib
- composite material
- forming
- die
- fiber
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
Abstract
The invention discloses a reinforced fiber soft mold forming method for forming a composite material component and application thereof.A metal dummy piece which is completely consistent with the external dimension of a composite material reinforcing rib structural member is processed by a mechanical manufacturing method, and a reinforced fiber soft mold tool with certain rigidity for forming the composite material component is manufactured by the metal dummy piece; the soft die tool can uniformly and accurately transmit the pressure applied by the autoclave to the composite material reinforcing rib structural member, thereby avoiding the thermal hysteresis effect of the reinforcing rib part, ensuring the overall dimension and the profile tolerance of the reinforcing rib and simultaneously improving the manufacturing efficiency of a finished piece.
Description
Technical Field
The invention relates to a reinforced fiber soft mold forming method for forming a composite material component and application thereof.
Background
The resin-based carbon fiber composite material has superior performances of high specific strength and specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability and the like, and is a high-performance structural material which is widely applied in the fields of aviation, aerospace, traffic and the like at present. In the molding process of various carbon fiber composite materials, the autoclave process has uniform molding temperature and pressure and good adaptability to parts of different materials, shapes, sizes and structures, thereby becoming one of the main process methods for researching and manufacturing aerospace high-quality composite material components.
With the increasing requirements for strength and rigidity of composite material parts, the structures of the parts are more and more complex, wherein a web structural member with a unidirectional or longitudinal-transverse reinforcing rib assembly is one of typical structural members. For example, a web of relatively complex composite material stiffeners, which includes not only longitudinal and transverse stiffener structures, but also thickened areas and lightening holes in the web, is often required to have strict spacing between the stiffeners and relative positioning of the stiffeners and the web during the manufacture of such parts.
At present, most of the parts are molded by a core mold method, and the core mold is generally made of mold steel or aluminum alloy. The core mold has the function of transferring the pressure and the temperature of the autoclave to a composite material workpiece to enable the workpiece to be molded at high temperature and high pressure, and simultaneously the rigidity of the core mold can ensure that the overall dimension of the reinforcing rib meets the design requirement. The disadvantages of using a mandrel are mainly the following three aspects: (1) because the core mould has certain rigidity, the external pressure is conducted through the core mould, so that the uniformity and the accuracy are difficult to achieve, and the thickness of the reinforcing rib part of the finished piece is easy to cause over-tolerance; (2) because the core mold has a certain thickness, according to the heat conduction effect, the temperature rise rate of the reinforcing rib part of the workpiece is lagged behind that of other parts, thereby influencing the internal molding quality of the workpiece; (3) because the core mould is made of metal, the dead weight is large, and the operation is very inconvenient. Meanwhile, the manufacturing and maintenance cost of the metal core mold is high, and the manufacturing period of repair or rework is long.
Disclosure of Invention
Aiming at the problems, the invention provides a reinforced fiber soft mold forming method for forming a composite material component and application thereof, wherein a reinforced fiber soft mold tool with certain rigidity is manufactured through a metal dummy piece which is completely consistent with a composite material reinforcing rib structural part; the soft die tool can uniformly and accurately transmit the pressure applied by the autoclave to the composite material reinforcing rib structural member, thereby avoiding the thermal hysteresis effect of the reinforcing rib part, ensuring the overall dimension and the profile tolerance of the reinforcing rib and simultaneously improving the manufacturing efficiency of a finished piece. The specific technical scheme is as follows:
the invention provides a fiber soft mold forming method for forming a composite material reinforcing rib structural member, which comprises the following steps:
1) manufacturing a metal dummy piece: processing a metal dummy piece which is completely consistent with the external dimension of the composite material reinforcing rib structural member by a mechanical manufacturing method;
2) manufacturing a soft mold: installing the metal dummy part manufactured in the step 1) in a forming die of a fiber soft die, paving a reinforced fiber prepreg on the surface of a cavity formed between the metal dummy part and the forming die of the fiber soft die, then combining the dies, and conveying the die assembly into an autoclave for curing, thereby manufacturing the fiber soft die with certain rigidity, namely the fiber soft die for forming the composite material reinforcing rib structural member.
As a preferable technical scheme, the cross section of the reinforcing rib in the sandwich structure of the composite material reinforcing rib structural member in the step 1) is L-shaped, T-shaped or omega-shaped.
As a preferable technical solution, in the step 2), the forming mold of the fiber soft mold has a side baffle and a bottom plate, and an assembly relationship exists between the side baffle and the metal dummy, and meanwhile, each baffle of the mold of the fiber soft mold has a limiting effect on the metal dummy. In addition, the surface of the reinforced fiber prepreg in the step 2) is coated with a rubber material. The reinforced fiber prepreg is a carbon fiber prepreg or a glass fiber prepreg and the like; the rubber material is preferably silicone rubber.
In a further preferable technical scheme, in the step 2), the number of the laid reinforcing fiber prepreg layers is 1-5.
As a preferable technical solution, in the step 2), the curing conditions are as follows: the curing pressure is 600-650 kPa, the curing temperature is 180 +/-6 ℃, and the curing time is 120 min. It should be noted that during the curing process described, the vacuum bag is vented to atmosphere when the curing pressure reaches 140kPa, and remains vented until curing is complete.
The invention also provides an application method of the fiber soft mold for molding the composite material reinforcing rib structural member, and specifically comprises the steps of installing the preformed reinforcing rib structural member into the fiber soft mold for molding the composite material reinforcing rib structural member, paving a web prepreg on the fiber soft mold and the reinforcing rib structural member, and then carrying out mold closing and curing to obtain the composite material reinforcing rib structural member.
The invention has the beneficial effects that:
compared with the prior art, the invention has at least the following advantages:
(1) the surface of the reinforced fiber soft mold manufactured by the invention is made of rubber with pressure pad performance, so that the pressure applied by the autoclave can be uniformly and accurately transmitted, the thermal hysteresis effect of the reinforcing rib part is avoided, and the phenomenon of the thickness of a composite material part being out of tolerance is avoided;
(2) the reinforcing fiber soft mold has certain rigidity, can be used for finishing co-curing manufacturing of reinforcing ribs and web structures, and improves the manufacturing efficiency of a workpiece while ensuring the overall dimension and the profile of the reinforcing ribs;
(3) the reinforced fiber soft mold manufactured by the invention can be repeatedly used, is more convenient to manufacture again, and effectively reduces the production cost and the manufacturing period.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the present embodiment, belong to the protection scope of the present invention.
The embodiment provides a fiber soft mold forming method for forming a composite material reinforcing rib structural member, and the fiber soft mold is applied to the forming process of the composite material reinforcing rib structural member. The forming method of the fiber soft mold for forming the composite material reinforcing rib structural part comprises the following steps:
1) manufacturing a metal dummy piece: processing a metal dummy piece which is completely consistent with the external dimension of the composite material reinforcing rib structural member by a mechanical manufacturing method; the section of the reinforcing rib in the sandwich structure of the composite material reinforcing rib structural member is L-shaped, T-shaped or omega-shaped.
2) Manufacturing a soft mold: installing the metal dummy piece manufactured in the step 1) in a forming die of a fiber soft die, wherein the forming die of the fiber soft die is provided with a side baffle and a bottom plate, an assembling relation exists between the side baffle and the metal dummy piece, and meanwhile, each baffle of the die of the fiber soft die plays a limiting role in the metal dummy piece.
Then 5 layers of reinforced fiber prepreg are paved on the surface of a cavity formed between the metal dummy piece and a forming die of the fiber soft die, the surface of the reinforced fiber prepreg is coated with a rubber material, the reinforced fiber prepreg is a carbon fiber prepreg, a glass fiber prepreg can be used in other embodiments, and the rubber material is preferably silicon rubber.
And (4) after the reinforcing fiber prepreg is laid and attached, carrying out die assembly, and then sending into an autoclave for curing. The curing pressure is controlled to be 600-650 kPa, the curing temperature is 180 +/-6 ℃, and the curing time is 120 min. Note that in the curing process, when the curing pressure reaches 140kPa, the vacuum bag is communicated with the atmosphere and is kept in a communicated state until the curing is completed, so that a fiber soft mold with certain rigidity, namely, the fiber soft mold for forming the composite material reinforcing rib structural member, is manufactured.
The method for forming the fiber soft mold used for the composite material reinforcing rib structural part comprises the steps of installing the preformed reinforcing rib structural part into the fiber soft mold, paving web prepreg on the fiber soft mold and the reinforcing rib structural part, and then carrying out mold closing and curing to obtain the composite material reinforcing rib structural part.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. Furthermore, it should be understood that the above description is only one preferred embodiment of the present invention, and is not intended to limit the present invention in any way, as those skilled in the art may change or modify the equivalent embodiments using the technical disclosure described above. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (9)
1. The fiber soft mold forming method for forming the composite material reinforcing rib structural part is characterized by comprising the following steps of: the method comprises the following steps:
1) manufacturing a metal dummy piece: processing a metal dummy piece which is completely consistent with the external dimension of the composite material reinforcing rib structural member by a mechanical manufacturing method;
2) manufacturing a soft mold: installing the metal dummy part manufactured in the step 1) in a forming die of a fiber soft die, paving a reinforced fiber prepreg on the surface of a cavity formed between the metal dummy part and the forming die of the fiber soft die, then combining the dies, and conveying the die assembly into an autoclave for curing, thereby manufacturing the fiber soft die with certain rigidity, namely the fiber soft die for forming the composite material reinforcing rib structural member.
2. The method of claim 1, wherein the method comprises the steps of: the section of the reinforcing rib in the sandwich structure of the composite material reinforcing rib structural member in the step 1) is L-shaped, T-shaped or omega-shaped.
3. The method of claim 1, wherein the method comprises the steps of: in the step 2), the forming die of the fiber soft die is provided with a side baffle and a bottom plate, an assembling relation exists between the forming die and the metal dummy, and meanwhile, each baffle of the die of the fiber soft die has a limiting effect on the metal dummy.
4. The method of claim 1, wherein the method comprises the steps of: in the step 2), the surface of the reinforced fiber prepreg is coated with a rubber material.
5. The method for forming a fiber soft mold for forming a structural member of a composite material reinforcing bar according to claim 1 or 4, wherein: the reinforced fiber prepreg is a carbon fiber prepreg or a glass fiber prepreg; the rubber material is silicon rubber.
6. The method of claim 1, wherein the method comprises the steps of: in the step 2), the number of the laid reinforced fiber prepreg layers is 1-5.
7. The method of claim 1, wherein the method comprises the steps of: in the step 2), the curing conditions are as follows: the curing pressure is 600-650 kPa, the curing temperature is 180 +/-6 ℃, and the curing time is 120 min.
8. The method for forming a fiber soft mold for forming a structural member of a composite material reinforcing bar according to claim 1 or 7, wherein: and in the step 2), curing, when the curing pressure reaches 140kPa, connecting the vacuum bag with the atmosphere, and keeping the connection state until the curing is finished.
9. The application of the fiber soft mold for forming the composite material reinforcing rib structural part is characterized in that: installing a preformed reinforcing rib structural member into the fiber soft mold according to claims 1-8, paving a web prepreg on the fiber soft mold and the reinforcing rib structural member, and then carrying out mold closing and curing to obtain the composite material reinforcing rib structural member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175178.9A CN110815855A (en) | 2019-11-26 | 2019-11-26 | Fiber soft mold forming method for forming composite material reinforcing rib structural part and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911175178.9A CN110815855A (en) | 2019-11-26 | 2019-11-26 | Fiber soft mold forming method for forming composite material reinforcing rib structural part and application |
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| CN110815855A true CN110815855A (en) | 2020-02-21 |
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| CN201911175178.9A Pending CN110815855A (en) | 2019-11-26 | 2019-11-26 | Fiber soft mold forming method for forming composite material reinforcing rib structural part and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470068A (en) * | 2020-03-18 | 2020-07-31 | 北京电子工程总体研究所 | Grille cover body structure for aircraft and manufacturing method thereof |
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| CN102963009A (en) * | 2012-12-11 | 2013-03-13 | 成都飞机工业（集团）有限责任公司 | Composite material multi-cavity structure piece manufacturing method |
| CN103213285A (en) * | 2013-04-24 | 2013-07-24 | 哈尔滨飞机工业集团有限责任公司 | Forming method of composite material part with variable cross-section closed cavity |
| CN104290336A (en) * | 2014-08-14 | 2015-01-21 | 航天海鹰(镇江)特种材料有限公司 | Method for forming J-shaped beam structure composite workpiece by open type soft tooling |
| CN105599318A (en) * | 2015-12-17 | 2016-05-25 | 航天海鹰(镇江)特种材料有限公司 | Method for using open-type rubber soft die for realization of thin-wall I-beam structure composite material part |
| CN105984154A (en) * | 2016-06-14 | 2016-10-05 | 沈阳飞机工业（集团）有限公司 | Forming method of U-shaped beam type composite part |
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2019
- 2019-11-26 CN CN201911175178.9A patent/CN110815855A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102963009A (en) * | 2012-12-11 | 2013-03-13 | 成都飞机工业（集团）有限责任公司 | Composite material multi-cavity structure piece manufacturing method |
| CN103213285A (en) * | 2013-04-24 | 2013-07-24 | 哈尔滨飞机工业集团有限责任公司 | Forming method of composite material part with variable cross-section closed cavity |
| CN104290336A (en) * | 2014-08-14 | 2015-01-21 | 航天海鹰(镇江)特种材料有限公司 | Method for forming J-shaped beam structure composite workpiece by open type soft tooling |
| CN105599318A (en) * | 2015-12-17 | 2016-05-25 | 航天海鹰(镇江)特种材料有限公司 | Method for using open-type rubber soft die for realization of thin-wall I-beam structure composite material part |
| CN105984154A (en) * | 2016-06-14 | 2016-10-05 | 沈阳飞机工业（集团）有限公司 | Forming method of U-shaped beam type composite part |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111470068A (en) * | 2020-03-18 | 2020-07-31 | 北京电子工程总体研究所 | Grille cover body structure for aircraft and manufacturing method thereof |
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Application publication date: 20200221 |