CN112810182A - Forming method of composite material cylindrical support - Google Patents
Forming method of composite material cylindrical support Download PDFInfo
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- CN112810182A CN112810182A CN202011590094.4A CN202011590094A CN112810182A CN 112810182 A CN112810182 A CN 112810182A CN 202011590094 A CN202011590094 A CN 202011590094A CN 112810182 A CN112810182 A CN 112810182A
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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
- B29C70/04—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
Abstract
The invention discloses a forming method of a composite material cylindrical support, which comprises 1) preparing materials, 2) preparing a die; 3) blanking for the first time; 4) manufacturing a material arrangement; 5) blanking for the second time; 6) layering; 7) precuring, namely, reserving machine allowance according to the thickness of a product, precuring at a corresponding layer, using a silica gel plate to assist compaction, filling the silica gel plate in the axial groove and the circumferential groove, fixing the axial groove through an aluminum plate and an iron wire, and fixing the circumferential groove through the iron wire; manufacturing a vacuum bag, sequentially placing a porous isolating membrane, an air felt and an isolating membrane on the surface of a mould, and performing cold pressing test and high-pressure curing in an autoclave; 8) finally, curing; 9) machining; 10) paving an anticorrosive layer; 11) and (6) demolding. The method of the invention adopts the carbon fiber prepreg as the raw material, thus effectively reducing the weight of the product, resisting chemical corrosion and having stable structure.
Description
Technical Field
The invention relates to a molding method of a special-shaped bracket, in particular to a molding method of a composite material special-shaped structural part.
Background
The carbon fiber reinforced resin matrix composite has the characteristics of high specific strength, high specific modulus, stable size, strong designability and the like, is one of the hotspots of current material research, and the carbon fiber composite structural member gradually replaces a metal structural member and is widely applied to industries such as automobile industry, aerospace, rail transit, weaponry and the like in recent years. For complex structural members, the application of composite materials is often limited by product quality, and phenomena such as bridging, wrinkles, pores, glue enrichment and the like seriously affect the product quality, and the phenomena are particularly serious in special-shaped structural members.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for forming a composite material cylindrical support, which meets the requirements of light weight, chemical corrosion resistance, stable structure and the like of the support.
The purpose of the invention is realized as follows: a molding method of a composite material cylinder support comprises the following steps:
step 1) material preparation: taking out the prepreg and the adhesive film from the refrigeration house, and cooling for more than 6 hours at room temperature for later use;
step 2) preparing a die: installing and fastening an aluminum alloy insert of the die, screwing flanges at two ends, cleaning the surface of the die by using acetone, and coating the surface of the die for more than 3 times by using a release agent;
step 3), first blanking: according to the result of the strength calculation, cutting the prepreg sheets at all angles required by the laying by using an automatic fabric cutting machine for standby;
step 4) manufacturing a monolith: mixing materials according to the stacking angle sequence, laying 0 degree on a first layer on a flat plate mould, vacuumizing and compacting for 15min, and sequentially placing a suction adhesive tape, a porous isolating membrane and a breathable felt during compaction; then sequentially laying at-45 degrees, 90 degrees and 45 degrees, and then carrying out secondary vacuumizing compaction for more than 4 hours;
step 5) blanking for the second time: manufacturing a blanking drawing according to size requirements, and cutting the whole material into a proper size;
step 6) layering: two layering methods are adopted for alternate layering, wherein the first method is used for odd-numbered layers, axial whole laying and circumferential splicing are carried out; the second method is used for circumferential whole paving and axial splicing of even-numbered layers;
step 7) precuring: reserving a machine allowance according to the thickness of a product, performing precuring on a corresponding layer, performing compaction assisted by a silica gel plate, filling the silica gel plate with an axial groove and a circumferential groove, fixing the axial groove by an aluminum plate and an iron wire, and fixing the circumferential groove by the iron wire; manufacturing a vacuum bag, sequentially placing a porous isolating membrane, an air felt and an isolating membrane on the surface of a mould, and performing cold pressing test and high-pressure curing in an autoclave;
step 8) final curing: manufacturing a vacuum bag, wrapping a porous isolating membrane and an air felt on the surface of a mould, placing a vacuum nozzle according to the size of the mould, and performing cold pressing test, and then entering an autoclave for final high-pressure curing;
step 9), machining: after solidification, removing the die aluminum alloy insert, and machining the outer diameter of the composite material blank to the size of the drawing by using a lathe;
step 10), laying an anticorrosive layer: cleaning the surface of a product, sequentially paving and pasting an adhesive film and prepreg, and manufacturing a vacuum bag for compaction after each layer is paved; manufacturing a vacuum bag, and respectively placing a rubberized fabric and nylon cloth on the surface of the composite material; after the vacuum bag passes the cold pressing test, putting the mould and the composite material into an oven for final solidification;
step 11), demolding: the aluminum alloy insert is disassembled through the threaded hole in the surface of the insert, the limiting flange can be taken out by using the fastening flange, after the aluminum alloy insert and the flange are disassembled, the fastening flange at one end is assembled again, and the product can be taken down from the die by applying force to the product through the threaded hole in the flange by using the screw.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the method adopts the carbon fiber prepreg as the raw material, so that the weight of the product is effectively reduced; the inner surface and the outer surface adopt glass fiber/epoxy resin prepreg, so that the corrosion resistance is improved; the autoclave process is adopted for molding, so that the porosity of the composite material is reduced, and the structural strength of the composite material is improved; the accuracy and the work efficiency of prepreg paving in a small operation space are improved. The bracket manufactured by the method does not contain any metal, has relatively low density, meets the requirements of small mass and light weight, adopts the detachable insert to control the framework structure, and can effectively ensure the structural size and the raw material utilization rate of the product; through material arrangement manufacturing and precuring, operability of the prepreg paving process is improved, and production efficiency and product percent of pass can be effectively improved.
In order to improve the strength of the product, the paving angle in the step 4) is 0 degree, 45 degrees, 90 degrees and +45 degrees in sequence.
In order to control the quality of the laying layer, pre-pumping is carried out once when 4 layers of material are laid and adhered in step 6), and silica gel is filled and covered with a conformal aluminum alloy plate for prepressing in the pre-pumping process.
In order to ensure the internal quality and the forming effect of the product, the pressure adopted in the pre-curing and curing in the steps 7) and 8) is 0.6 MPa.
In order to prevent the product from being damaged, a copper plate is padded between the product and the fastening flange in the step 11).
Drawings
FIG. 1 is a schematic view of the mold structure of the present invention.
FIG. 2 is a cross-sectional view of a mold and product of the present invention during pre-curing.
FIG. 3 is a schematic view of the product and mold structure during demolding in accordance with the present invention.
FIG. 4 is a schematic view of the structure of the stent product of the present invention.
The die comprises a die 1, an aluminum alloy insert 1-1, a product 2, a silica gel plate 3, an aluminum plate 4, a copper plate 5, a fastening flange 6, a limiting flange 7 and a screw 8.
Detailed Description
A method of forming a composite material cylindrical stent as shown in fig. 1-3, comprising the steps of:
step 1) material preparation: taking out the prepreg and the adhesive film from the refrigeration house, and cooling for more than 6 hours at room temperature for later use;
step 2) preparing a die: installing and fastening an aluminum alloy insert 1-1 of the die, screwing flanges at two ends, cleaning the surface of the die by using acetone, and coating the surface of the die for more than 3 times by using a release agent;
step 3), first blanking: according to the result of the strength calculation, cutting the prepreg sheets at all angles required by the laying by using an automatic fabric cutting machine for standby;
step 4) manufacturing a monolith: mixing materials according to the stacking angle sequence of [0 to 45,90 and +45], laying 0 degree on a first layer on a flat plate mould, vacuumizing and compacting for 15min, and sequentially placing a suction adhesive tape, a porous isolating membrane and a breathable felt during compaction; then sequentially laying at-45 degrees, 90 degrees and 45 degrees, and then carrying out secondary vacuumizing compaction for more than 4 hours;
step 5) blanking for the second time: manufacturing a blanking drawing according to size requirements, and cutting the whole material into a proper size;
step 6) layering: because the structure of the bracket is a cross-shaped structure, two layering methods are adopted for alternative layering, and the first method is used for odd-numbered layers, axial whole-laying and circumferential splicing; the second method is used for circumferential whole paving and axial splicing of even-numbered layers; in order to control the quality of the laying layer, pre-pumping is carried out once when 4 layers of material are laid and adhered, and silica gel is filled and a cover is added to pre-press the follow-up type aluminum alloy plate in the pre-pumping process.
Step 7) precuring: reserving machine allowance according to the thickness of a product, performing precuring on a corresponding layer, reserving 5mm machine allowance according to the thickness of the product, wherein the total layer needs 100 layers, the precuring is performed on the 20 th layer, the 40 th layer, the 60 th layer and the 80 th layer respectively, the final curing is performed after the 100 th layer is layered, the corresponding thicknesses are 10mm, 20mm, 30mm, 40mm and 50mm respectively, a silica gel plate 3 is adopted for assisting compaction, an axial groove and a circumferential groove are filled with the silica gel plate 3, and then the axial groove and the circumferential groove are fixed through an aluminum plate 4 and an iron wire; manufacturing a vacuum bag, sequentially placing a porous isolating membrane, an air felt and an isolating membrane on the surface of a mould, and performing cold pressing test and high-pressure curing in an autoclave; in order to ensure the internal quality and the forming effect of the product, the pressure adopted during the pre-curing and the curing is 0.6 MPa;
step 8) final curing: manufacturing a vacuum bag, wrapping a porous isolating membrane and an air felt on the surface of a mould, placing a vacuum nozzle according to the size of the mould, and performing cold pressing test, and then entering an autoclave for final high-pressure curing;
step 9), machining: after solidification, removing the die aluminum alloy insert, and machining the outer diameter of the composite material blank to the size of the drawing by using a lathe;
step 10), laying an anticorrosive layer: cleaning the surface of a product, sequentially paving and pasting an epoxy adhesive film and a glass fiber/epoxy resin prepreg, and manufacturing a vacuum bag for compaction after each layer is paved and pasted; manufacturing a vacuum bag, and respectively placing a rubberized fabric and nylon cloth on the surface of the composite material; after the vacuum bag passes the cold pressing test, putting the mould and the composite material into an oven for final solidification;
step 11), demolding: the aluminum alloy insert 1-1 is disassembled through a threaded hole in the surface of the insert, the limiting flange 7 can be taken out through the fastening flange 6, after the aluminum alloy insert 1-1 and the flange are disassembled, the fastening flange 6 at one end is installed again, the product 2 can be taken down from the die by applying force to the product 2 through the threaded hole in the flange through the screw 8, and the copper plate 5 is arranged between the product 2 and the fastening flange 6 in a cushioning mode, so that the product 2 is prevented from being damaged.
As shown in fig. 4, the cylindrical stent after demolding has a cross-section ring with an outer diameter of 180mm, an inner diameter of 90mm, a thickness of 20mm, and an axial frame with a length of 1350 × 20 × 50mm, and if other structural members are bonded or assembled on the outer surface of the stent at a later stage, the step 10 can be eliminated.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (5)
1. A forming method of a composite material cylinder support is characterized by comprising the following steps:
step 1) material preparation: taking out the prepreg and the adhesive film from the refrigeration house, and cooling for more than 6 hours at room temperature for later use;
step 2) preparing a die: installing and fastening an aluminum alloy insert of the die, screwing flanges at two ends, cleaning the surface of the die by using acetone, and coating the surface of the die for more than 3 times by using a release agent;
step 3), first blanking: according to the result of the strength calculation, cutting the prepreg sheets at all angles required by the laying by using an automatic fabric cutting machine for standby;
step 4) manufacturing a monolith: mixing materials according to the stacking angle sequence, laying 0 degree on a first layer on a flat plate mould, vacuumizing and compacting for 15min, and sequentially placing a suction adhesive tape, a porous isolating membrane and a breathable felt during compaction; then sequentially laying at-45 degrees, 90 degrees and 45 degrees, and then carrying out secondary vacuumizing compaction for more than 4 hours;
step 5) blanking for the second time: manufacturing a blanking drawing according to size requirements, and cutting the whole material into a proper size;
step 6) layering: two layering methods are adopted for alternate layering, wherein the first method is used for odd-numbered layers, axial whole laying and circumferential splicing are carried out; the second method is used for circumferential whole paving and axial splicing of even-numbered layers;
step 7) precuring: reserving a machine allowance according to the thickness of a product, performing precuring on a corresponding layer, performing compaction assisted by a silica gel plate, filling the silica gel plate with an axial groove and a circumferential groove, fixing the axial groove by an aluminum plate and an iron wire, and fixing the circumferential groove by the iron wire; manufacturing a vacuum bag, sequentially placing a porous isolating membrane, an air felt and an isolating membrane on the surface of a mould, and performing cold pressing test and high-pressure curing in an autoclave;
step 8) final curing: manufacturing a vacuum bag, wrapping a porous isolating membrane and an air felt on the surface of a mould, placing a vacuum nozzle according to the size of the mould, and performing cold pressing test, and then entering an autoclave for final high-pressure curing;
step 9), machining: after solidification, removing the die aluminum alloy insert, and machining the outer diameter of the composite material blank to the size of the drawing by using a lathe;
step 10), laying an anticorrosive layer: cleaning the surface of a product, sequentially paving and pasting an adhesive film and prepreg, and manufacturing a vacuum bag for compaction after each layer is paved; manufacturing a vacuum bag, and respectively placing a rubberized fabric and nylon cloth on the surface of the composite material; after the vacuum bag passes the cold pressing test, putting the mould and the composite material into an oven for final solidification;
step 11), demolding: the aluminum alloy insert is disassembled through the threaded hole in the surface of the insert, the limiting flange can be taken out by using the fastening flange, after the aluminum alloy insert and the flange are disassembled, the fastening flange at one end is assembled again, and the product can be taken down from the die by applying force to the product through the threaded hole in the flange by using the screw.
2. The method for forming a composite material cylindrical stent according to claim 1, wherein the layering angle in the step 4) is 0 °, -45 °,90 ° and +45 ° in sequence.
3. The method for forming a composite material cylindrical support according to claim 1, wherein the pre-drawing is performed once every 4 layers of the whole materials are paved in the step 6), and silica gel is filled and a follow-up type aluminum alloy plate is covered for pre-pressing in the pre-drawing process.
4. The method for forming a composite material cylindrical stent according to claim 1, wherein the pressure used for pre-curing and curing in step 7) and step 8) is 0.6 MPa.
5. The method as claimed in claim 1, wherein a copper plate is padded between the product and the fastening flange in the step 11).
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| CN202011590094.4A CN112810182B (en) | 2020-12-29 | 2020-12-29 | Forming method of composite material cylindrical support |
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| CN202011590094.4A CN112810182B (en) | 2020-12-29 | 2020-12-29 | Forming method of composite material cylindrical support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114643724A (en) * | 2022-03-21 | 2022-06-21 | 天津爱思达新材料科技有限公司 | Rapid blanking method for complex curved surface composite material |
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