CN104527085A - Composite multi-closed-chamber thick-walled box beam and integral moulding method - Google Patents
Composite multi-closed-chamber thick-walled box beam and integral moulding method Download PDFInfo
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- CN104527085A CN104527085A CN201410727516.6A CN201410727516A CN104527085A CN 104527085 A CN104527085 A CN 104527085A CN 201410727516 A CN201410727516 A CN 201410727516A CN 104527085 A CN104527085 A CN 104527085A
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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
- B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
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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
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- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention brings forward a composite multi-closed-chamber thick-walled box beam and an integral moulding method. The box beam comprises a multi-closed-chamber box framework and an external skin. The multi-closed-chamber box framework adopts a fiber reinforced material/prepreg resin system, and the external skin adopts a fiber reinforced material fabric/liquid molding resin system. The multi-closed-chamber box framework and the external skin are integrally formed. A layer of fibrofelt reinforced resin film is also included between the multi-closed-chamber box framework and the external skin. The fibrofelt reinforced resin film has a consistent resin system with the external skin. By inserting a layer of the fibrofelt reinforced resin film with lower surface density between the internal framework and the external skin, the resin film has good compatibility with the prepreg resin system and the liquid molding resin system in the curing mechanism. In addition, the influence on flow of the liquid molding resin is little, interface connection quality between the internal framework and the external skin is improved, and internal quality and integrity of the product are improved.
Description
Technical field
The present invention relates to a kind of composite many closed chambers heavy wall (referring to the situation that wall thickness is greater than 0.05 with the ratio of cross-sectional maximum dimension) box beam and integral forming method, belong to technical field of composite materials.
Background technology
Compared with simply cutting section bar, many closed chambers box beam has good counter-bending, anti-lateral shear and anti-torsion performance, and it, as the important engineering structure element of a class in Advanced Equipment, is widely used in the fields such as Aero-Space, traffic above-ground, marine ship.Along with Advanced Equipment improving constantly structure lightened demand, polymer matrix composites, with the feature of its high specific strength, high ratio modulus, become one of preferred version of alternative traditional metal materials gradually.
Many closed chambers box beam is generally made up of with " outer covering " " foam core ", " inner skeleton ", foam core is the supporting construction of inner skeleton in forming process, inner skeleton is the many closed cell structure of heavy wall be made up of multiple independently single closed cell structure, bears most of service load; Outer covering is closed thin-wall construction, by by inner skeleton integral coating, to keep globality and the stability of many closed chambers box beam.
The traditional molding methods of composite many closed chambers box beam can adopt autoclave or RTM forming method.According to autoclave molding method, inner closed cell structure and stressed-skin construction need be prepared first respectively, then be combined as an overall structure by secondary cementation solidifying, the method need use the equipment such as expensive autoclave on the one hand, also need hardens in several stages, product manufacturing cycle is longer, and cost is higher; And adopt traditional RTM forming method, when many closed chambers box beam length is longer, wall thickness is larger, resin flow path is longer and not easily fully infiltrate on wall thickness direction, causes producing dry spot, layering or the mass defect such as loose.At present, kinds of processes compound is a direction of composite material forming method research, as adopted the goods of RTM and the various comparatively labyrinth of mold pressing composite molding; But, the difference in curing mechanism, viscosity etc. due to prepreg resin system and liquid condition shaping resin system, in forming process, prepreg resin system can be the state of very thickness at two kinds of resin system interfaces, the flowing of liquid towards moulding resin system and consolidation are produced inhibition, easily form the defect such as hole, layering in interface, and then affect the internal soundness of final product.
Summary of the invention
The object of the invention is to overcome prior art deficiency, provide that a kind of interface quality is good, product internal soundness is stable, composite many closed chambers heavy wall box beam and integral forming method reliably.
Technical solution of the present invention: a kind of composite many closed chambers heavy wall box beam, comprise many closed chambers box-like skeleton and outer covering, many closed chambers box-like skeleton adopts fibre reinforced materials/prepreg resin system, outer covering adopts fibre reinforced materials fabric/liquid condition shaping resin system, many closed chambers box-like skeleton and outer covering global formation, also comprise the resin molding that one deck fibrofelt strengthens between described many closed chambers box-like skeleton and outer covering, the resin molding resin system used that fibrofelt strengthens is consistent with outer covering resin system used.
The resin molding that the present invention strengthens by increasing one deck fibrofelt between many closed chambers box-like skeleton and outer covering, when liquid condition shaping injecting glue, the interface of the resin molding that fibrofelt strengthens between prepreg resin system and liquid condition shaping resin system forms resin-rich layer, effectively improves quality between two kinds of resin system interfaces.
The resin molding that fibrofelt strengthens adopts the resin system with outer covering liquid condition shaping homology, on fibrofelt, resin molding is prepared by directly brushing, for making the film forming of process of deployment and form resin-rich layer smoothly at interface in liquid condition shaping, in the resin molding strengthen fibrofelt, the surface density of fibrofelt and resin content (quality of resin accounts for the percentage of the resin molding quality that fibrofelt strengthens) limit, and the surface density of fibrofelt is not more than 60g/m
2, resin content is 60 ~ 70%.
The resin molding paving that fibrofelt strengthens is applied in process comparatively large to the dependence of environment temperature, can when preparing the resin molding that fibrofelt strengthens, and in resin, add thickener, as glass microsphere or rubber etc., the consumption of thickener can be selected according to concrete operations environment; Also the resin molding that the fibrofelt prepared strengthens can be solidified in advance, make it have 20 ~ 30% curing degrees in advance.The object of aforesaid operations improves the viscosity that paving applies resin in process, reduces the dependence to environment temperature.
A kind of composite many closed chambers heavy wall box beam integral forming method, comprises the following steps:
Adopt the coated core of fibre-reinforced prepregs, prepare many closed chambers box-like prefabricated skeleton part;
A1, prepare single closed chamber box-like prefabricated skeleton part,
The size of the single closed chamber sub-block determining to form many closed chambers inner skeleton, number and wall thickness is required according to physical dimension and structural mechanical property, then single closed chamber sub-block is prepared, again single closed chamber sub-block combinations is become many closed chambers inner skeleton, adopt the processes such as vacuum bag, mold pressing, expansion flexible-mould assisted method to prepare inner skeleton structure.
A1.1, carry out prepreg according to single closed chamber box-like skeleton structure and size and cut out;
A1.2, according to Lay up design coated prepreg on core;
A1.3, at 70 ~ 90 DEG C of temperatures system 30 ~ 50min, obtain single closed chamber box-like prefabricated skeleton part;
A2, by after all single closed chamber box-like prefabricated skeleton part combinations, at 70 ~ 90 DEG C of temperatures system 30 ~ 50min, obtain many closed chambers box-like prefabricated skeleton part.
At the resin molding that the outer cladding fibrofelt of many closed chambers box-like prefabricated skeleton part strengthens, guarantee that precast body surface is covered completely by resin mold;
At the resin molding outer cladding dry state fabric that fibrofelt strengthens, obtain many closed chambers heavy wall box beam precast body;
By many closed chambers heavy wall box beam precast body injecting glue in a mold, carry out liquid condition shaping; With
Integrally curing obtains composite many closed chambers heavy wall box beam.
Complete many resin systems co-curing reaction process according to the injection technological parameter of resin system and curing cycle, the overall co-curing realizing inner skeleton and outer covering is shaping.
In the present invention, inner skeleton precast body (many closed chambers box-like prefabricated skeleton part) adopts fortifying fibre/prepreg resin system, by the methods such as vacuum bag, mold pressing or expansion flexible-mould assisted be shaping preparation; Outer covering adopts reinforcing material fabric/liquid condition shaping resin system, and after outer covering is coated by inner skeleton, the overall co-curing being realized many closed chambers heavy wall box beam by liquid condition shaping methods such as RTM, VARTM, VARI or RFI is shaping.
The present invention is in preparation process, employing areal density fibrofelt enhancing resin molding is laid in prepreg precast body as intercalation material and dry state strengthens between fabric, the matrix of this membrane material and liquid condition shaping resin are same material, in glued membrane state at lay temperature, be flowable liquid state under injection temperature.In forming process, areal density fibrofelt strengthens resin molding and has good paving manufacturability, can form even, fine and close resin-rich layer, and and have good flowing matching between liquid condition shaping resin in interface.The introducing of areal density fibrofelt enhancing resin molding improves the interface quality between prepreg resin system and liquid condition shaping resin system, guarantees that composite product internal soundness is stable, reliable.
The resin system of the present invention to prepreg does not have particular/special requirement, and those skilled in the art can select the conventional prepreg resin system used such as low temperature curing prepreg epoxy resin, intermediate temperature setting prepreg epoxy resin, hot setting prepreg epoxy resin or BMI prepreg resin as required.
The present invention does not have particular/special requirement to the liquid condition shaping resin matrix that outer covering adopts, and those skilled in the art can select the conventional liquid condition shaping resin system used such as low cold curing RTM epoxy resin, intermediate temperature setting RTM epoxy resin, hot setting RTM epoxy resin, RTM bimaleimide resin, VARI vinylite, VAR work epoxy resin as required.
The present invention does not have particular/special requirement to the kind that areal density fibrofelt strengthens reinforcing fiber mats in resin molding, for ensureing the film forming of resin molding in laying, only limiting reinforcing fiber mats surface density, requiring that surface density is not more than 60g/m
2, concrete kind can select glass mat, carbon fiber felt, aramid fiber felt etc. as required.
The present invention's beneficial effect compared with prior art:
(1) the present invention inserts one deck areal density fibrofelt by the interface between inner skeleton and outer covering and strengthens resin mold, this resin mold has good matching in curing mechanism and prepreg resin system and liquid condition shaping resin system, and liquid towards moulding resin flow effect is less, improve the interface quality of connection between inner skeleton and outer covering, improve internal soundness and the globality of product;
(2) the present invention is according to many closed chambers box beam design feature, the resin system with different process feature is adopted in forming process, prepreg system is applied to many closed chambers heavy wall skeleton structure shaping, guarantee that inner skeleton structural resin content is easy to control, and there is excellent moulded manufacturability, liquid condition shaping resin system is applied to outer thin-walled skin shaping structures, in liquid condition shaping process, resin only flows in outer thin-walled skin, runner is simple, overcomes the shortcoming that runner in complicated thick-wall part liquid condition shaping process is complicated, resin not easily fully infiltrates;
(3) the present invention has low cost of manufacture, manufacturing cycle short advantage, overcome existing many closed chambers heavy wall box beam and adopt that autoclave molding method cost is high, the cycle long, it is Integratively formed to be difficult to, and adopt conventional liquid forming method cannot guarantee the problem of interiors of products quality.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is exemplary construction schematic diagram (solid) of the present invention;
Fig. 3 is example sectional view of the present invention.
Detailed description of the invention
The present invention's many closed chambers heavy wall box beam mainly comprises inner skeleton, outer covering and foam core three part, and wherein foam core is the supporting construction of inner skeleton in forming process; Many closed chambers thick-walled structure that inner skeleton is combined by independently single closed cell structure, adopts fibre reinforced materials/prepreg resin system, by vacuum bag or mold pressing pre-formed; Outer covering is simple closed thin-wall construction, and adopt fibre reinforced materials fabric/liquid condition shaping resin system, after resin injection filling mould, inner skeleton and outer covering co-curing under unified curing cycle is an overall structure.
The present invention is described in detail below in conjunction with instantiation and accompanying drawing.
The present embodiment makes composite many closed chambers heavy wall box beam, for the mobile luggage carrier of numerical control device.Concrete structure is as 2, shown in 3, comprise entablature 1, sill 2, guide-track groove 3, upper journal 4, down journal 5, its internal structure is by foam core-A 6, foam core-B 7, foam core-C 8, foam core-D 9, single closed chamber box-like structure-A 10, single closed chamber box-like structure-B 11, single closed chamber box-like structure-C 12, single closed chamber box-like structure-D 13, areal density fibrofelt strengthens resin molding 14, outer covering 15 is formed, wherein single closed chamber box-like structure-A 10, single closed chamber box-like structure-B11, single closed chamber box-like structure-C 12 and single closed chamber box-like structure-D 13 forms inner skeleton, resin molding 14 is strengthened with areal density fibrofelt, outer covering 15 co-curing is shaped to an overall structure.This crossbeam length envelope is 1600mm, width envelope is 480mm, height envelope is 150mm, inner skeleton typical thickness is that (wherein skeleton frame structure is 5mm to 4mm and 8mm, the middle part type of falling π structure is 10mm), outer covering typical thickness is 2mm, and upper journal and collateral ear thickness are 4mm.
Inner skeleton adopts temperature epoxy carbon fiber prepreg in T700/9368, and prepreg thickness in monolayer is 0.125mm, and Post RDBMS temperature is 130 DEG C.Areal density fibrofelt strengthens 6808 resin moldings that resin molding adopts T700 chopped carbon fiber felt to strengthen, and T700 chopped carbon fiber felt surface density is 40g/m2, and resin mold apparent thickness is 0.1mm.Outer covering precast body material of main part adopts T700-12K carbon fiber multiple-axial WARP-KNITTING (multi-axial tricot is the knitted fabric simultaneously being woven lopping, mutually string cover by several groups of warp thread that machine direction is identical or different on warp loom), thickness in monolayer 0.125mm, top layer adopts the preparation of T300-3K carbon fiber plain cloth, thickness in monolayer is 0.2mm, liquid condition shaping injection resin adopts temperature epoxy system in 6808, and Post RDBMS temperature is 130 DEG C.
Above-mentioned composite many closed chambers heavy wall box beam adopts the overall co-curing forming method based on prepreg and RTM two kinds of resin systems, specific implementation process as shown in Figure 1:
1, vacuum bag process is adopted to prepare 4 pieces of single closed chamber box-like structure precast bodies:
According to each single closed chamber box-like structure shape and size, blanking and laying are carried out to prepreg, then adopt the laying scheme of [03/+45/03/-45] 2s respectively by foam core-A 6, foam core-B 7, foam core-C 8, foam core-D 9 integral coating, form single closed chamber box-like structure-A 10, single closed chamber box-like structure-B 11, single closed chamber box-like structure-C 12, the composite preform of single closed chamber box-like structure-D 13, wherein 0 ° of direction is that ([] 2s implication is this box beam length direction: first laying in bracket is carried out 2 circulations, the laying of lay and above-mentioned laying symmetry on this basis).Then adopt vacuum bag system to the composite preform of above-mentioned 4 pieces of single closed chamber box-like structures at 70 DEG C, suppress under 1atm air pressure, pressing process continues 40 minutes, naturally removes vacuum bag system after cooling.The laying scheme of [03/+45/03/-45] 2s that the present embodiment adopts is symmetrical equilibrium laying, and this laying effectively can control the thermal deformation that final composite product causes because different laying directions thermal coefficient of expansion is inconsistent.
2, vacuum bag process is adopted to prepare many closed chambers box beam inner skeleton composite preform:
Single closed chamber box-like structure-A 10, single closed chamber box-like structure-B 11, single closed chamber box-like structure-C 12, single closed chamber box-like structure-D 13 precast body are combined into many closed chambers box beam inner skeleton composite preform as shown in Figure 3, then vacuum bag system is adopted to this precast body at 80 DEG C, suppress under 1atm air pressure, pressing process continues 40 minutes, naturally removes vacuum bag system after cooling.
3, as shown in Figure 3, areal density fibrofelt enhancing resin mold 14 uniform spreading is attached on the many closed chambers box-like inner skeleton composite preform outer surface prepared in second step, guarantees that precast body outer surface is strengthened resin mold 14 by areal density fibrofelt and covers completely.
4, as shown in Figure 3, adopt T700-12K carbon fiber multiple-axial WARP-KNITTING, T300-3K carbon fiber plain cloth as the raw material of the outer covering 15 of preparation, the areal density fibrofelt that is affixed with prepared in step 3 strengthens on the inner skeleton composite preform outer surface of resin mold 14, carry out integral coating with the fiber-reinforced fabric in given laying direction, form the final final precast body of many closed chambers box beam.
5, final many closed chambers box beam composite preform is positioned in overall RTM injection molding, completes matched moulds.
6, open vacuum plant, RTM injection molding is vacuumized, RTM injection molding is slowly warming up to 70 DEG C simultaneously, under 70 DEG C of constant temperatures, then complete 6808 resin injections.
7, according to 9368 resin systems and the curing cycle of 6808 resin systems complete many resin systems prepreg-RTM co-curing reaction process (prepreg system adopt 9368 resin systems and RTM system to adopt 6808 resin system curing cycles identical, therefore unified curing cycle can be adopted to complete co-curing reaction process), the overall co-curing realizing inner skeleton and outer covering is shaping.
8, the demoulding after cooling, obtains composite many closed chambers heavy wall cell type beam.
The composite many closed chambers box beam outward appearance prepared by method described in the present embodiment is good, and dimensional accuracy conservation rate is high.In order to check the quality that above-mentioned box beam is shaping, cross section cutting has been carried out to it, observation metallographic style, metallographic result shows, and well, inner skeleton and outer covering land define an overall continuous interfacial district for box beam inner skeleton and outer covering body interior quality, ensure that structural intergrity, compared with the forming method that other are traditional, there is equal internal soundness and technological effect, and in the moulded manufacturability, manufacturing cost etc. of complicated product, there is obvious advantage.
The unspecified part of the present invention is known to the skilled person technology.
Claims (10)
1. composite many closed chambers heavy wall box beam, comprise many closed chambers box-like skeleton and outer covering, many closed chambers box-like skeleton adopts fibre reinforced materials/prepreg resin system, outer covering adopts fibre reinforced materials fabric/liquid condition shaping resin system, many closed chambers box-like skeleton and outer covering global formation, it is characterized in that: also comprise the resin molding that one deck fibrofelt strengthens between described many closed chambers box-like skeleton and outer covering, the resin molding resin system used that fibrofelt strengthens is consistent with outer covering resin system used.
2. a kind of composite many closed chambers heavy wall box beam according to claim 1, is characterized in that: in the resin molding that described fibrofelt strengthens, resin content is 60 ~ 70%.
3. a kind of composite many closed chambers heavy wall box beam according to claim 1 and 2, is characterized in that: in the resin molding that described fibrofelt strengthens, the surface density of fibrofelt is not more than 60g/m
2.
4. a kind of composite many closed chambers heavy wall box beam according to claim 1 and 2, is characterized in that: the resin molding that described fibrofelt strengthens solidifies in advance, and curing degree is 20 ~ 30%.
5. a kind of composite many closed chambers heavy wall box beam according to claim 1 and 2, is characterized in that: add thickener in the resin that the resin molding that described fibrofelt strengthens is used.
6. composite many closed chambers heavy wall box beam integral forming method, is characterized in that, comprise the following steps:
Adopt the coated core of fibre-reinforced prepregs, prepare many closed chambers box-like prefabricated skeleton part;
At the resin molding that the outer cladding fibrofelt of many closed chambers box-like prefabricated skeleton part strengthens;
At the resin molding outer cladding dry state fabric that fibrofelt strengthens, obtain many closed chambers heavy wall box beam precast body;
By many closed chambers heavy wall box beam precast body injecting glue in a mold, carry out liquid condition shaping; With
Integrally curing obtains composite many closed chambers heavy wall box beam.
7. a kind of composite many closed chambers heavy wall box beam integral forming method according to claim 6, is characterized in that: in the resin molding that described fibrofelt strengthens, resin content is 60 ~ 70%.
8. a kind of composite many closed chambers heavy wall box beam integral forming method according to claim 6 or 7, is characterized in that: in the resin molding that described fibrofelt strengthens, the surface density of fibrofelt is not more than 60g/m
2.
9. a kind of composite many closed chambers heavy wall box beam integral forming method according to claim 6 or 7, it is characterized in that: the resin molding that described fibrofelt strengthens solidifies in advance, curing degree be 20 ~ 30% or the resin molding that strengthens of described fibrofelt resin used in add thickener.
10. a kind of composite many closed chambers heavy wall box beam integral forming method according to claim 6, is characterized in that: the preparation of described many closed chambers box-like prefabricated skeleton part is realized by following steps,
A1, prepare single closed chamber box-like prefabricated skeleton part,
A1.1, carry out prepreg according to single closed chamber box-like skeleton structure and size and cut out;
A1.2, according to Lay up design coated prepreg on core;
A1.3, at 70 ~ 90 DEG C of temperatures system 30 ~ 50min, obtain single closed chamber box-like prefabricated skeleton part;
A2, by after all single closed chamber box-like prefabricated skeleton part combinations, at 70 ~ 90 DEG C of temperatures system 30 ~ 50min, obtain many closed chambers box-like prefabricated skeleton part.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109109400A (en) * | 2016-06-13 | 2019-01-01 | 亿航智能设备（广州）有限公司 | A kind of composite material and aircraft |
| CN109203519A (en) * | 2018-08-13 | 2019-01-15 | 江苏三强复合材料有限公司 | Siding reinforcement co-curing forming technique |
| CN112721241A (en) * | 2020-12-14 | 2021-04-30 | 成都航空职业技术学院 | Multi-wall sandwich structure carbon fiber composite material and preparation method thereof |
| CN114030205A (en) * | 2021-11-16 | 2022-02-11 | 航天特种材料及工艺技术研究所 | Packing box and manufacturing method thereof |
| CN116079991A (en) * | 2023-01-12 | 2023-05-09 | 东华大学 | Hybrid molding process for high-performance hybrid molding thermoplastic composite material with pre-optimized interface |
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| CN101678616A (en) * | 2007-03-29 | 2010-03-24 | 古瑞特（英国）有限公司 | Fibre-reinforced composite moulding and manufacture thereof |
| CN102448709A (en) * | 2009-05-25 | 2012-05-09 | 空中客车作业有限公司 | Device and method for producing a composite component |
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| CN101062594A (en) * | 2006-04-28 | 2007-10-31 | 通用电气公司 | Methods and apparatus for fabricating blades |
| CN101678616A (en) * | 2007-03-29 | 2010-03-24 | 古瑞特（英国）有限公司 | Fibre-reinforced composite moulding and manufacture thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109109400A (en) * | 2016-06-13 | 2019-01-01 | 亿航智能设备（广州）有限公司 | A kind of composite material and aircraft |
| CN109109400B (en) * | 2016-06-13 | 2021-03-02 | 亿航智能设备（广州）有限公司 | Composite material and aircraft |
| CN109203519A (en) * | 2018-08-13 | 2019-01-15 | 江苏三强复合材料有限公司 | Siding reinforcement co-curing forming technique |
| CN112721241A (en) * | 2020-12-14 | 2021-04-30 | 成都航空职业技术学院 | Multi-wall sandwich structure carbon fiber composite material and preparation method thereof |
| CN114030205A (en) * | 2021-11-16 | 2022-02-11 | 航天特种材料及工艺技术研究所 | Packing box and manufacturing method thereof |
| CN114030205B (en) * | 2021-11-16 | 2023-05-12 | 航天特种材料及工艺技术研究所 | Packing box and manufacturing method thereof |
| CN116079991A (en) * | 2023-01-12 | 2023-05-09 | 东华大学 | Hybrid molding process for high-performance hybrid molding thermoplastic composite material with pre-optimized interface |
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