CN113021943A - Composite material bent sheet forming method and die - Google Patents
Composite material bent sheet forming method and die Download PDFInfo
- Publication number
- CN113021943A CN113021943A CN202110261819.3A CN202110261819A CN113021943A CN 113021943 A CN113021943 A CN 113021943A CN 202110261819 A CN202110261819 A CN 202110261819A CN 113021943 A CN113021943 A CN 113021943A
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- China
- Prior art keywords
- composite material
- silica gel
- material bent
- upper cover
- boss
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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
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
Abstract
The invention discloses a composite material bent sheet molding method and a mold, wherein the molding method utilizes a base and an upper cover to compress a silica gel gasket to form a sealing structure which can be inflated from the outside, and the inflation interface of the upper cover is inflated and pressurized, so that the silica gel gasket inside expands to extrude the composite material and is heated, cured and molded at the same time; the scheme has low requirement on production equipment, simple manufacture, low cost and environmental protection, the manufactured carbon fiber product has less post rework, good quality and high yield, and the problem that the existing forming method can not take processing quality and cost into consideration is practically solved.
Description
Technical Field
The invention relates to the field of composite material processing, in particular to a composite material bent sheet forming method and a die.
Background
The advanced composite material has a series of advantages of high specific strength, specific modulus, excellent corrosion resistance, fatigue resistance, designability and the like, and the thin plate made of the composite material is light and convenient, has high cost performance, and is mainly used for covering in the aviation field, bonding and reinforcing with a non-metal material shell, decorating products in various fields and the like.
At present, the forming process of the composite material bent plate mainly comprises compression molding of a hot pressing table and heating, curing and forming of a vacuumizing hot pressing tank. The artware manufactured by the two methods has good quality, but the cost of the input equipment is high. The compression molding efficiency is high, the operation is simple, but the requirement on the quality of the mold is high, and the early-stage investment preparation period is long; the early stage vacuumizing preparation work for heating, curing and forming of the vacuumizing autoclave is troublesome, the efficiency is low, and the vacuum bag cannot be reused and is not environment-friendly.
Disclosure of Invention
The invention aims to provide a composite material bent sheet forming method and a die, and aims to solve the problem that the existing forming method cannot give consideration to both processing quality and cost.
In order to solve the above technical problems, the present invention provides a method for forming a composite material bent sheet, comprising the steps of,
step S1, manufacturing a composite material bent thin plate forming die according to the shape of the composite material to be formed, wherein the composite material bent thin plate forming die comprises a base and an upper cover; the base is provided with an inner cavity and a sealing groove, the shape of the inner cavity is matched with the shape of the composite material to be molded, and the sealing groove is arranged in a circle around the periphery of the inner cavity; the upper cover is provided with an air nozzle interface which is communicated with two opposite surfaces of the upper cover;
step S2, manufacturing a silica gel gasket according to the shape of the composite material to be molded, wherein a boss is arranged on one surface of the silica gel gasket, and the boss is arranged around the periphery of the silica gel gasket for a circle;
step S3, coating a release agent in the inner cavity, and then pasting a prepreg composite material on the surface of the inner cavity;
step S4, embedding the boss into the sealing groove to enable the silica gel gasket to cover the prepreg composite material, and then pressing the silica gel gasket by using the upper cover;
step S5, placing the assembled composite material bent thin plate forming die on a heating table for heating, and inflating and pressurizing the interior of the composite material bent thin plate forming die through the air nozzle interface so as to utilize the expansion of the silica gel gasket to compact the prepreg composite material;
and step S6, completing the forming process, and taking out the formed composite material bent sheet from the composite material bent sheet forming die.
Preferably, in step S2, the height of the boss is 3-5 mm greater than the depth of the sealing groove.
Preferably, in step S2, a proper amount of silica gel raw material is prepared, vacuumized, poured and filled on a silica gel pad mold, placed on a heating table for heating and vulcanizing, cooled, removed from the mold, and trimmed to obtain the silica gel pad.
Preferably, in step S2, the shore hardness of the boss is set to be between 10 degrees and 20 degrees.
Preferably, in step S5, the heating is performed at a temperature of 140 to 180 ℃.
Preferably, in step S5, the pressure for inflation is between 0.4MPa and 0.8 MPa.
Preferably, in step S6, the composite material bent thin plate forming mold is water-cooled, and then the upper cover and the silica gel gasket are sequentially removed to take out the formed composite material bent thin plate.
In order to solve the technical problem, the invention also provides a composite material bent sheet forming die, which comprises a base, an upper cover and a silica gel gasket; the base is provided with an inner cavity and a sealing groove, the shape of the inner cavity is matched with the shape of the composite material to be molded, and the sealing groove is arranged in a circle around the periphery of the inner cavity; the upper cover is provided with an air nozzle interface which is communicated with two opposite surfaces of the upper cover; the silica gel gasket centre gripping in the base with between the upper cover, the silica gel gasket covers the inner chamber, silica gel gasket one surface is equipped with the boss, the boss centers on the week side of silica gel gasket arranges the round, the boss embedding in the seal groove.
Preferably, the height of the boss is 3-5 mm greater than the depth of the sealing groove.
Preferably, the shore hardness of the boss is between 10 degrees and 20 degrees.
The invention has the following beneficial effects:
when production is carried out, the assembled composite material bent thin plate forming die is placed on a heating table to be heated, the air nozzle interface is used for inflating and pressurizing the inside of the composite material bent thin plate forming die, so that the silica gel gasket is used for expanding and pressing the pre-impregnated composite material, and the bending forming of the composite material can be completed.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a composite material curved sheet structure provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a base structure provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a silica gel gasket according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an assembly state of a silica gel gasket according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an assembly manner of a composite material and a silica gel gasket according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a composite material in a molding state according to an embodiment of the present invention.
The reference numbers are as follows:
10. pre-impregnating the composite material; 11. bending the thin plate by the composite material;
20. a base; 21. an inner cavity; 22. a sealing groove;
30. an upper cover; 31. an air nozzle interface;
40. a silica gel gasket; 41. and (4) a boss.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 6, the present invention provides a composite material bent sheet forming method, including the steps of,
step S1, manufacturing a composite material bent sheet forming die according to the shape of the composite material to be formed, wherein the composite material bent sheet forming die comprises a base 20 and an upper cover 30; the base 20 is provided with an inner cavity 21 and a sealing groove 22, the shape of the inner cavity 21 is matched with the shape of the composite material to be molded, and the sealing groove 22 is arranged around the periphery of the inner cavity 21 for a circle; the upper cover 30 is provided with an air nozzle interface 31, and the air nozzle interface 31 is communicated with two opposite surfaces of the upper cover 30;
step S2, manufacturing a silica gel gasket 40 and the silica gel gasket 40 according to the shape of the composite material to be molded, wherein a boss 41 is arranged on one surface of the silica gel gasket 40, and the boss 41 is arranged around the periphery of the silica gel gasket 40 for a circle;
step S3, coating a release agent in the inner cavity 21, and then pasting the prepreg composite material 10 on the surface of the inner cavity 21;
step S4, embedding the boss 41 into the sealing groove 22, so that the silicone gasket 40 covers the prepreg composite material 10, and then pressing the silicone gasket 40 with the upper cover 30;
step S5, placing the assembled composite material bent thin plate forming die on a heating table for heating, and inflating and pressurizing the interior of the composite material bent thin plate forming die through an air nozzle interface 31 so as to utilize the expansion of the silica gel gasket 40 to compact the prepreg composite material 10;
in step S6, the molding process is completed, and the molded composite material bent sheet 11 is taken out from the composite material bent sheet molding die.
In the mode of vacuum bag machine-shaping, not only the operation is complicated, and the vacuum bag is damaged easily moreover, and this scheme requires lowly to the equipment of production, and the preparation is concise, with low costs, and the environmental protection, the carbon fiber goods later stage reworking that makes out is few, of high quality, and the yields is high, has solved the problem that current forming method can't compromise processingquality and cost conscientiously.
Preferably, in step S2, the height of the boss 41 is greater than the depth of the sealing groove 22 by 3-5 mm, and after the arrangement, the silicone gasket 40 can be stably clamped (so as to ensure sealing) between the upper cover 30 and the base 20, wherein the upper cover 30 and the base 20 can be screwed and fixed by using bolts.
Preferably, in step S2, a proper amount of silica gel raw material is prepared, vacuumized, poured and filled on a silica gel pad mold, placed on a heating table for heating and vulcanizing, cooled, removed from the mold and trimmed to obtain the silica gel pad 40; after the molding method is adopted, the expansion deformation of the silica gel gasket 40 in the subsequent operation can be ensured, so that the prepreg composite material 10 can be tightly pressed.
Preferably, in step S2, the shore hardness of the boss 41 is set to be between 10 degrees and 20 degrees; after the arrangement mode is adopted, the hardness and the deformation capacity of the boss 41 can be ensured, and important guarantee is provided for the sealing performance in the manufacturing process.
Preferably, in step S5, the heating is performed at a temperature of 140 to 180 ℃; with this arrangement, it is possible to ensure a suitable temperature, thereby facilitating the production of a composite material bent sheet 11 of excellent quality.
Preferably, in step S5, the pressure for inflation is between 0.4MPa and 0.8 MPa; with this arrangement, it is possible to ensure a suitable air pressure for producing the composite material bent sheet 11 of excellent quality.
Preferably, in step S6, the composite material bent sheet forming mold is water-cooled, and then the upper cover 30 and the silica gel gasket 40 are sequentially removed to take out the formed composite material bent sheet 11; after the operation mode is adopted, the difficulty in removing the composite material bent thin plate 11 is reduced, so that the removal of the composite material bent thin plate 11 is facilitated.
As shown in fig. 1 to 6, the present invention further provides a composite material bent thin plate forming mold, which is applied to the composite material bent thin plate forming method, and includes a base 20, an upper cover 30 and a silica gel gasket 40; the base 20 is provided with an inner cavity 21 and a sealing groove 22, the shape of the inner cavity 21 is matched with the shape of the composite material to be molded, and the sealing groove 22 is arranged around the periphery of the inner cavity 21 for a circle; the upper cover 30 is provided with an air nozzle interface 31, and the air nozzle interface 31 is communicated with two opposite surfaces of the upper cover 30; the silica gel gasket 40 is clamped between the base 20 and the upper cover 30, the silica gel gasket 40 covers the inner cavity 21, a boss 41 is arranged on one surface of the silica gel gasket 40, the boss 41 surrounds the silica gel gasket 40 in a circle, and the boss 41 is embedded into the sealing groove 22.
In a similar way, after the mold is adopted, the requirement on equipment can be lowered, the manufacturing is simple, the cost is low, the environment is protected, the reworking of the manufactured carbon fiber product in the later period is less, the quality is good, the yield is high, and the problem that the processing quality and the cost cannot be considered in the existing forming method is solved practically.
Like the above, the height of the boss 41 of this embodiment is greater than the depth of the sealing groove 22 by 3-5 mm, and after the arrangement, the upper cover 30 and the base 20 can be ensured to stably clamp the silica gel gasket 40, wherein the upper cover 30 and the base 20 can be screwed and fixed by using bolts.
As above, the shore hardness of the boss 41 of this embodiment is between 10 degrees and 20 degrees; after the arrangement mode is adopted, the hardness and the deformation capacity of the boss 41 can be ensured, and important guarantee is provided for the sealing performance in the manufacturing process.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for forming a composite material bent sheet is characterized by comprising the following steps,
step S1, manufacturing a composite material bent thin plate forming die according to the shape of the composite material to be formed, wherein the composite material bent thin plate forming die comprises a base and an upper cover; the base is provided with an inner cavity and a sealing groove, the shape of the inner cavity is matched with the shape of the composite material to be molded, and the sealing groove is arranged in a circle around the periphery of the inner cavity; the upper cover is provided with an air nozzle interface which is communicated with two opposite surfaces of the upper cover;
step S2, manufacturing a silica gel gasket according to the shape of the composite material to be molded, wherein a boss is arranged on one surface of the silica gel gasket, and the boss is arranged around the periphery of the silica gel gasket for a circle;
step S3, coating a release agent in the inner cavity, and then pasting a prepreg composite material on the surface of the inner cavity;
step S4, embedding the boss into the sealing groove to enable the silica gel gasket to cover the prepreg composite material, and then pressing the silica gel gasket by using the upper cover;
step S5, placing the assembled composite material bent thin plate forming die on a heating table for heating, and inflating and pressurizing the interior of the composite material bent thin plate forming die through the air nozzle interface so as to utilize the expansion of the silica gel gasket to compact the prepreg composite material;
and step S6, completing the forming process, and taking out the formed composite material bent sheet from the composite material bent sheet forming die.
2. The composite material bent sheet forming method as claimed in claim 1,
in step S2, the height of the boss is 3-5 mm greater than the depth of the sealing groove.
3. The composite material bent sheet forming method as claimed in claim 1,
in step S2, a proper amount of silica gel raw material is prepared, vacuumized, poured and filled on a silica gel pad mold, placed on a heating table for heating and vulcanizing, cooled, removed from the mold and trimmed to obtain the silica gel pad.
4. The composite material bent sheet forming method as claimed in claim 3,
in step S2, the shore hardness of the boss is set to be between 10 degrees and 20 degrees.
5. The composite material bent sheet forming method as claimed in claim 1,
in step S5, the heating temperature is 140 to 180 ℃.
6. The composite material bent sheet forming method as claimed in claim 1,
in step S5, the pressure of the air to be inflated is 0.4MPa to 0.8 MPa.
7. The composite material bent sheet forming method as claimed in claim 1,
in step S6, the composite material bent sheet forming mold is water-cooled, and then the upper cover and the silica gel gasket are sequentially removed to take out the formed composite material bent sheet.
8. A composite material bending sheet forming die is characterized in that,
comprises a base, an upper cover and a silica gel gasket;
the base is provided with an inner cavity and a sealing groove, the shape of the inner cavity is matched with the shape of the composite material to be molded, and the sealing groove is arranged in a circle around the periphery of the inner cavity;
the upper cover is provided with an air nozzle interface which is communicated with two opposite surfaces of the upper cover;
the silica gel gasket centre gripping in the base with between the upper cover, the silica gel gasket covers the inner chamber, silica gel gasket one surface is equipped with the boss, the boss centers on the week side of silica gel gasket arranges the round, the boss embedding in the seal groove.
9. The composite material bent sheet forming die as claimed in claim 8, wherein the height of the boss is 3-5 mm greater than the depth of the sealing groove.
10. The composite curved sheet forming die of claim 8, wherein the boss has a shore hardness of between 10 degrees and 20 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261819.3A CN113021943A (en) | 2021-03-10 | 2021-03-10 | Composite material bent sheet forming method and die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261819.3A CN113021943A (en) | 2021-03-10 | 2021-03-10 | Composite material bent sheet forming method and die |
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| Publication Number | Publication Date |
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| CN113021943A true CN113021943A (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110261819.3A Pending CN113021943A (en) | 2021-03-10 | 2021-03-10 | Composite material bent sheet forming method and die |
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| CN103831971A (en) * | 2012-11-23 | 2014-06-04 | 杨贤斌 | Silica gel inner core mould heating andcuring epoxy resin preimpregnated fiber forming method and product thereof |
| CN104801027A (en) * | 2015-03-13 | 2015-07-29 | 桐乡波力科技复材用品有限公司 | Manufacture method for baseball bat |
| 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 |
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| CN109591324A (en) * | 2017-09-30 | 2019-04-09 | 比亚迪股份有限公司 | The forming method of carbon fiber product |
| CN110027226A (en) * | 2019-02-28 | 2019-07-19 | 东华大学 | A kind of P-RTM moulding process being used to prepare enhancing composite material |
| CN111438964A (en) * | 2020-04-27 | 2020-07-24 | 李宁（中国）体育用品有限公司 | Forming die and forming method of composite material sheet |
| CN214926219U (en) * | 2021-03-10 | 2021-11-30 | 广州雷迅创新科技股份有限公司 | Composite material bent sheet forming die |
-
2021
- 2021-03-10 CN CN202110261819.3A patent/CN113021943A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350792A (en) * | 2011-09-15 | 2012-02-15 | 上海晋飞复合材料科技有限公司 | Connecting method of silica gel auxiliary composite material profile |
| CN103831971A (en) * | 2012-11-23 | 2014-06-04 | 杨贤斌 | Silica gel inner core mould heating andcuring epoxy resin preimpregnated fiber forming method and product thereof |
| CN104801027A (en) * | 2015-03-13 | 2015-07-29 | 桐乡波力科技复材用品有限公司 | Manufacture method for baseball bat |
| 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 |
| CN206106422U (en) * | 2016-06-29 | 2017-04-19 | 河南中机华远机械工程有限公司 | Novel vacuum bag shaping device |
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| CN110027226A (en) * | 2019-02-28 | 2019-07-19 | 东华大学 | A kind of P-RTM moulding process being used to prepare enhancing composite material |
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Application publication date: 20210625 |
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