CN113799414B - Large grid cylinder and vacuum-assisted RTM (real time kinematic) forming method thereof - Google Patents
Large grid cylinder and vacuum-assisted RTM (real time kinematic) forming method thereof Download PDFInfo
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- CN113799414B CN113799414B CN202111022904.0A CN202111022904A CN113799414B CN 113799414 B CN113799414 B CN 113799414B CN 202111022904 A CN202111022904 A CN 202111022904A CN 113799414 B CN113799414 B CN 113799414B
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
-
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The application provides a vacuum auxiliary RTM forming method of a large grid cylinder, which comprises the following steps: manufacturing a vacuum bag along the molding surface of the mold by using the grid cylinder product prefabricated member; the plastic outlet tank is connected with a plurality of plastic outlets of the cylinder body for vacuumizing; injecting glue to the grating cylinder from bottom to top in a layered manner, and when the height of the layer and the circumferential glue injection are finished and the glue outlet of the lower layer begins to be out, controlling the glue outlet of the lower layer to switch from vacuumizing to RTM glue injection through a three-way switching valve, and finishing the process from bottom to top in a layered manner through an annular runner until the top is completely soaked and the glue begins to be out; when a large amount of glue is discharged from a glue outlet at the top of the grid cylinder, reversely pressurizing from a glue discharge tank; closing the interface of the glue injection pipeline, and continuously vacuumizing the glue outlet until the subsequent furnace feeding is heated and solidified to obtain the large grid barrel. The method can ensure the full infiltration of the residual dead angle of the prefabricated part of the grid cylinder under the condition of higher required fiber volume content, reduce the air holes in the product, improve the product quality and ensure that the porosity of the product is lower than 2 percent.
Description
Technical Field
The application relates to the technical field of composite material forming, in particular to a large-scale grating cylinder and a vacuum-assisted RTM forming method suitable for the large-scale grating cylinder.
Background
As an innovative material, the composite material has the advantages of designability, light weight, high strength, high modulus, stable chemical property, good mechanical property and the like, and is widely applied to various fields of national economy. In the age of rapid development of aerospace industry, the aerospace industry aims at the huge advantages of composite materials, in the projects of space stations, manned lunar climbing and the like, large-scale composite material grid barrels with large size and large bearing characteristics are gradually developed, and the bearing efficiency and the bearing capacity of a large-scale grid structure can be improved through winding sequence, layering angles, layer numbers and process design. The low expansion target of the structural member in all directions can be achieved through winding and layering design, the light weight can be achieved, and meanwhile, high structural rigidity can be maintained under high-low temperature alternation in the service process. The large composite material grating cylinder has long molding period, and the dry winding preformed piece is preferable in the molding method, but the porosity is high, so that the molding quality of the product cannot be ensured.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a vacuum-assisted RTM forming method suitable for a large grid barrel. So as to solve the problem of long product forming period, reduce product pores and ensure product quality.
The application aims at realizing the following scheme:
a vacuum-assisted RTM molding method suitable for a large grid cylinder comprises the following steps:
s1, manufacturing a vacuum bag along the molding surface of a mold by using a grid cylinder product prefabricated member;
step S2, connecting a glue outlet tank through a plurality of glue outlets of the cylinder body, and vacuumizing; the glue outlet tank is provided with a glue solution storage function, a vacuum system is protected, the glue outlet tank is used as a glue injection device for pressurizing in the subsequent direction, and the vacuum degree of the product is monitored by adopting a measurement mode of suction measurement and separation;
s3, injecting glue into the grid cylinder prefabricated member from the bottom to the top in a layered mode, when the height of the layer (the first layer) and the circumferential glue injection are finished, and the glue outlet of the second layer starts to be out, controlling the conversion from vacuumizing to RTM glue injection of the glue outlet through a three-way switching valve by a plurality of glue outlets of the second layer, finishing the process from the bottom to the top in a layered mode through an annular runner, and controlling the glue injection rate until the top is completely soaked and the glue outlet starts to be out; setting observation intervals along the height direction of the barrel section of the grid barrel prefabricated member, the tank bodies of the glue inlet tank and the glue outlet tank, the pipeline flow channels and the like, monitoring the glue injection condition in real time, and adjusting the glue injection rate accordingly;
s4, when a large amount of glue is discharged from a glue outlet at the top of the grid cylinder prefabricated member, reversely pressurizing the glue from the glue outlet of the glue discharge tank to the inside of the grid cylinder prefabricated member; fiber infiltration is increased, and air holes are reduced;
and S5, closing the interface of the glue injection pipeline, continuously vacuumizing the glue outlet, and further removing air holes until the subsequent furnace feeding is heated and solidified to obtain the large grid barrel.
Preferably, in the step S2, the vacuum degree of the product is also monitored by adopting a measurement mode of separated suction measurement.
Preferably, in the step S2, the vacuum degree of the separated product is less than or equal to-0.097 MPa.
Preferably, in the step S3, the glue injection rate is completed layer by layer according to the height of 200mm/4h of each layer.
Preferably, in the step S3, the resin system used for injecting the glue is an epoxy TDE-85 resin system, and the normal temperature viscosity is 200mpa·s to 300mpa·s.
Preferably, in the step S3, the grid cylinder prefabricated member is subjected to glue injection by 10 layers from bottom to top.
Preferably, in the step S4, the pressure of the reverse pressurization is 0.1MPa.
Preferably, the basic properties of the resin casting body adopted by the large grid barrel are as follows: the tensile strength is more than or equal to 55MPa, and the tensile modulus is more than or equal to 3.5GPa; the bending strength is more than or equal to 110MPa, and the bending modulus is more than or equal to 3.5GPa.
Preferably, the grid cylinder prefabricated part has the diameter of phi 3800mm and the height of 2000mm.
Preferably, 30 glue injection ports are uniformly arranged in the height direction and the circumferential direction of the grid cylinder prefabricated member.
Compared with the prior art, the application has the following beneficial effects:
1. the method of the application not only can solve the problem of the applicability period of wet winding resin under the condition of long winding period, but also can reduce the pores between the product fiber and the resin and ensure the molding quality of the product.
2. According to the method, the multiple glue outlets are connected with the glue outlet tank for vacuumizing, so that the vacuumizing efficiency is improved, and the authenticity and accuracy of the vacuum degree of the product are improved by adopting a vacuumizing separation method;
3. according to the method, the problem of short resin pot life of the wet winding piece can be perfectly solved by using the dry winding post-injection glue.
4. The method of the application adopts the measures of layer-by-layer glue injection and reverse pressing, can ensure the full infiltration of the residual dead angle of the prefabricated part of the grating cylinder under the condition of higher required fiber volume content, further reduces the air holes in the product, improves the quality of the grating cylinder product, ensures that the porosities of two products molded by the method meet the requirement of being superior to 2 percent in design, and is lower than the index of 3 to 4 percent of the porosities of the conventional RTM products. The porosity of the product is lower than 2%. The ultrasonic nondestructive inspection device is used for detecting the material, meets the C-level standard in GJB2895, and has stable molding quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a grid cylinder mold glue injection system according to the present application.
FIG. 2 is a schematic view of the injection port of the grid cylinder mold of the present application.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.
The present application will be described in detail with reference to specific embodiments and fig. 1 and 2.
Examples
A vacuum-assisted RTM molding method suitable for a large grid cylinder comprises the following steps:
s1, manufacturing a vacuum bag from a grid cylinder product prefabricated member to an outer flange surface by using a pressure equalizing plate and other auxiliary materials;
s2, connecting 30 glue injection ports 2 and three glue outlet ports 1 (as shown in figure 2, 3 glue injection ports are uniformly distributed along the circumferential direction, ten glue outlet ports are formed in each row, and the vacuum degree of a product is monitored by adopting a measurement mode of sampling and measuring separation) with a vacuum pipeline interface 3 of a glue outlet tank for vacuumizing; wherein, 3 glue outlets 1 are only used for glue outlet and are arranged at the positions of the nodes where the glue outlet is difficult;
s3, injecting glue into 10 layers of grid cylinder prefabricated parts from bottom to top, starting to discharge the glue from an outlet of a glue injection tank 6, connecting 3 glue injection ports of a bottom flange of a product mold through a three-way switching valve, wherein 3 rows of cylinder bodies are divided into 30 glue injection ports (as shown in FIG. 2, 3 rows of glue injection ports are uniformly distributed along the circumferential direction, 10 glue injection ports are arranged in each row, and meanwhile, the function of the glue injection ports) are kept in a vacuumizing state, when three glue outlet ports of a second layer of the product in the circumferential direction start to discharge the glue, switching from vacuumizing to RTM glue injection of the second layer of the glue outlet ports is controlled through a three-way valve switch, finishing from bottom to top by level through an annular runner, respectively controlling the glue injection time to be 200mm/4h according to the height of each layer, finishing level by level until the top is completely soaked and starting to discharge the glue;
s4, arranging glass observation windows 5 on the barrel section of the grid barrel prefabricated member along the height direction, the glue injection tank body and the glue outlet tank body, using a transparent pipeline 7 as an observation section for a pipeline runner, monitoring the glue injection condition in real time, and adjusting the glue injection rate accordingly;
s5, when a large amount of glue is discharged from a glue outlet at the top of the grid cylinder prefabricated member, pressurizing the glue outlet tank 4 reversely by 0.1MPa, pressurizing the glue solution of the glue outlet tank reversely from 33 paths of vacuum pipelines of the glue outlet to the inside of the grid cylinder, maintaining the pressure for 3 hours, increasing fiber infiltration, and reducing air holes;
s6, closing an interface of the glue injection pipeline, continuously vacuumizing a glue outlet, and further removing air holes until the glue outlet is heated and solidified after the glue inlet is subsequently fed into a furnace, wherein the vacuum degree is less than or equal to-0.097 MPa;
the application discloses a vacuum auxiliary RTM forming method suitable for a large grid barrel, wherein the grid barrel is a large composite material part with the diameter phi 3800mm and the height 2000mm and composed of variable density grid ribs, a skin and a flange. In the method, the vacuum pumping efficiency is improved by adopting a plurality of glue outlets to connect the glue outlet tanks for vacuum pumping, and the authenticity and the accuracy of the vacuum degree of the product are improved by adopting a method of vacuum testing and separation; the problem of short resin pot life of the wet winding piece can be perfectly solved by using the dry winding post-injection glue. The measures of layer-by-layer glue injection and reverse pressing are applied, so that under the condition of high-requirement fiber volume content, the full infiltration of residual dead angles of the prefabricated parts of the grid cylinder can be ensured, the air holes in the product are further reduced, the quality of the product of the grid cylinder is improved, and the porosity of the product is lower than 2%.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (6)
1. The vacuum-assisted RTM forming method for the large grid cylinder is characterized by comprising the following steps of:
s1, manufacturing a vacuum bag along the molding surface of a mold by using a grid cylinder product prefabricated member;
step S2, connecting a glue outlet tank through a plurality of glue outlets of the cylinder body, and vacuumizing;
s3, injecting glue to the grid cylinder prefabricated member from bottom to top in a layered mode, when the first layer of height direction and the annular glue injection are completed, and the glue outlet of the second layer begins to discharge glue, controlling the glue outlet of the second layer to switch from vacuumizing to RTM glue injection through a three-way switching valve, and completing the process from bottom to top in a layered mode through an annular runner until the top is completely soaked and glue discharge begins; the glue injection rate is finished layer by layer according to the height of each layer of 200mm/4 h; the resin system used for injecting glue is an epoxy TDE-85 resin system, and the normal temperature viscosity is 200 mPas to 300 mPas; injecting glue into 10 layers of the grid cylinder prefabricated member from bottom to top, and uniformly arranging 30 glue injection ports in the height direction and the circumferential direction of the grid cylinder prefabricated member;
s4, when a large amount of glue is discharged from a glue outlet at the top of the grid cylinder prefabricated member, reversely pressurizing the glue from the glue outlet of the glue discharge tank to the inside of the grid cylinder prefabricated member; the pressure of the reverse pressurization is 0.1MPa;
and S5, closing the interface of the glue injection pipeline, and continuously vacuumizing the glue outlet until the glue outlet is heated and solidified in a subsequent furnace to obtain the large grid barrel.
2. The method for forming a large grid cylinder according to claim 1, wherein in step S2, the vacuum degree of the product is monitored by a measurement method of separation by suction measurement.
3. The method for vacuum assisted RTM molding of a large grating cylinder according to claim 2, wherein in the step S2, the vacuum degree of the vacuum separation monitoring product is less than or equal to-0.097 MPa.
4. The method for vacuum assisted RTM molding of large grating cylinders according to claim 1, wherein the basic properties of the resin casting body used for the large grating cylinder preform satisfy: the tensile strength is more than or equal to 55MPa, and the tensile modulus is more than or equal to 3.5GPa; the bending strength is more than or equal to 110MPa, and the bending modulus is more than or equal to 3.5GPa.
5. The method of vacuum assisted RTM molding of large grating cylinders according to claim 1, wherein the grating cylinder preform is 3800mm in diameter and 2000mm in height.
6. A large grating cylinder prepared by the vacuum assisted RTM molding method of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022904.0A CN113799414B (en) | 2021-09-01 | 2021-09-01 | Large grid cylinder and vacuum-assisted RTM (real time kinematic) forming method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022904.0A CN113799414B (en) | 2021-09-01 | 2021-09-01 | Large grid cylinder and vacuum-assisted RTM (real time kinematic) forming method thereof |
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| CN113799414A CN113799414A (en) | 2021-12-17 |
| CN113799414B true CN113799414B (en) | 2023-08-22 |
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| CN114589943B (en) * | 2022-03-23 | 2023-08-04 | 成都飞机工业（集团）有限责任公司 | T-shaped rib glue injection mold for resin transfer molding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101352925A (en) * | 2008-08-25 | 2009-01-28 | 中国船舶重工集团公司第七二五研究所 | Vacuum auxiliary molding technique produced by high-facade composite material for ship |
| CN105398064A (en) * | 2015-11-30 | 2016-03-16 | 南京航空航天大学 | Integral molding method and molding die for fiber-reinforced resin-based composite round pipe |
| CN111421858A (en) * | 2020-05-18 | 2020-07-17 | 北京玻钢院复合材料有限公司 | Composite material launching box and preparation method thereof |
| CN111572065A (en) * | 2020-06-24 | 2020-08-25 | 福建省华辰管业科技有限公司 | Improved glue injection mold for fiber woven winding pultrusion pipeline |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6818159B2 (en) * | 2000-03-17 | 2004-11-16 | Deutsches Zentrum Fuer Luft-Und Raumfahrt E.V. | Process for the production of a composite consisting of a fiber reinforced material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101352925A (en) * | 2008-08-25 | 2009-01-28 | 中国船舶重工集团公司第七二五研究所 | Vacuum auxiliary molding technique produced by high-facade composite material for ship |
| CN105398064A (en) * | 2015-11-30 | 2016-03-16 | 南京航空航天大学 | Integral molding method and molding die for fiber-reinforced resin-based composite round pipe |
| CN111421858A (en) * | 2020-05-18 | 2020-07-17 | 北京玻钢院复合材料有限公司 | Composite material launching box and preparation method thereof |
| CN111572065A (en) * | 2020-06-24 | 2020-08-25 | 福建省华辰管业科技有限公司 | Improved glue injection mold for fiber woven winding pultrusion pipeline |
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