CN118046596A - Forming method of composite material ellipsoidal shell - Google Patents
Forming method of composite material ellipsoidal shell Download PDFInfo
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- CN118046596A CN118046596A CN202410455568.6A CN202410455568A CN118046596A CN 118046596 A CN118046596 A CN 118046596A CN 202410455568 A CN202410455568 A CN 202410455568A CN 118046596 A CN118046596 A CN 118046596A
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- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 23
- 210000001503 joint Anatomy 0.000 claims abstract description 17
- 239000004744 fabric Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000012797 qualification Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010017472 Fumbling Diseases 0.000 description 1
- 238000011074 autoclave method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a forming method of a composite material ellipsoidal shell in the technical field of composite material products, which comprises the following steps: step 1), preparing materials; step 2) preparing a die: the mold is divided into a forming mold and a preforming mold, wherein the forming mold is of a dish-shaped structure, an ellipsoidal cavity is formed in the inner side of the forming mold, the preforming mold is of a C-shaped structure, and if the two preforming molds are in butt joint, the ellipsoidal structure can be formed, and the outer surface of the preforming mold is consistent with the inner surface of the forming mold in shape; cleaning the surface to be paved of the mold, coating the surface of the mold by using a release agent, and abutting the preformed mold surface at the positions where release cloth is required to be adhered and joints are required to be jointed, so that the flatness of the molded surface is ensured; step 3) paving; step 4) making bags; step 5) curing; step 6) demoulding, the invention solves the problem of difficult paving in the prior art, and improves the production efficiency and the product qualification rate.
Description
Technical Field
The invention relates to the technical field of composite products, in particular to a composite shell forming method.
Background
The streamline design concept is widely applied to airplanes, submarines, automobiles, ships and the like, and streamline is often influenced by factors such as the profile degree, the appearance quality, the internal quality, the mechanical property and the like of products, so that the application of the composite material is greatly restrained. The composite material part obtained by the autoclave method has excellent internal quality and appearance quality, and the mechanical property can be regulated by reinforcing fibers. The composite material is subjected to high temperature and high pressure in the forming process, and is easy to deform. The amount of deformation often needs to be controlled by mold compensation iterative design and layup design, increasing material costs and mold manufacturing costs. The method for forming the ellipsoidal shell of the composite material is provided. The structure is paved in the female die in the traditional way, and the defect is that: the paving space is smaller, the paving difficulty is larger, and the qualification rate of the finally formed product is low.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a forming method of a composite material ellipsoidal shell, solves the problem of difficult paving and pasting in the prior art, and improves the production efficiency and the product qualification rate.
The purpose of the invention is realized in the following way: the forming method of the ellipsoidal shell of the composite material is characterized by comprising the following steps of:
Step 1) material preparation: cutting carbon fiber prepreg sheets at all angles required by layering for later use;
Step 2) preparing a die: the mold is divided into a forming mold and a preforming mold, wherein the forming mold is of a dish-shaped structure, an ellipsoidal cavity is formed in the inner side of the forming mold, the preforming mold is of a C-shaped structure, and if the two preforming molds are in butt joint, the ellipsoidal structure can be formed, and the outer surface of the preforming mold is consistent with the inner surface of the forming mold in shape; cleaning the surface to be paved of the mold, coating the surface of the mold by using a release agent, and abutting the preformed mold surface at the positions where release cloth is required to be adhered and joints are required to be jointed, so that the flatness of the molded surface is ensured;
step 3) paving: firstly paving and pasting the outer surface of a preformed mould to manufacture a hemispherical shell, and then transferring the preformed hemispherical shell into a forming mould;
And 4) bag making: sequentially placing a piece of stripping cloth, a non-porous isolating film, an air felt and a vacuum bag film on the upper surface of the part blank to manufacture a solidified vacuum bag;
Step 5) curing: heating, pressurizing and solidifying by using an autoclave;
Step 6) demolding: and removing the shell from the die to obtain the composite ellipsoidal shell.
As a further definition of the invention, the mould in step 2) comprises in particular:
The forming die comprises an upper die and a lower die which are integrally dish-shaped, wherein an ellipsoidal die cavity is formed on the inner surface of the upper die and the lower die after being in butt joint;
and the single preforming die is integrally C-shaped, and the outer surface of the single preforming die is consistent with the inner surface of the upper die and the lower die.
As a further definition of the invention, step 3) specifically comprises:
heating a pre-forming die and a forming die in advance to enable the temperature of the die to reach a preset temperature, manufacturing a hemispherical shell by using the pre-forming die, pre-pumping one layer by using a vacuum bag every time, and dividing the prepreg into three groups from inside to outside for paving; then taking off the hemispherical shell from the pre-forming die, putting the hemispherical shell into a forming die, rolling the hemispherical shell into a solid after putting the hemispherical shell into the forming die, and pre-drawing the hemispherical shell by using a vacuum bag to ensure that the hemispherical shell is in close contact with the forming die;
Butt joint is adopted when the prepreg is paved and pasted, the splicing gap is smaller than the set size, the butt joint is not allowed along the fiber direction, and the splicing seams are required to be staggered when the upper layer and the lower layer are paved and pasted; when the half spherical shells are paved and attached to the forming die, the half spherical shells are butted in pairs, and the upper layer and the lower layer are paved and attached in staggered butting positions.
As a further definition of the invention, step 4) specifically comprises:
the high-temperature curing auxiliary material is adopted: sequentially placing a piece of peeling cloth, a non-porous isolating film, an air felt and a high-temperature vacuum bag film on the inner surface of the inner shell of the forming die;
Placing a vacuum nozzle for vacuumizing, removing vacuumizing after the vacuum in the bag reaches a set value, checking whether a bridging place exists between the bag and the tool, and if so, leveling;
and continuously vacuumizing, removing vacuumizing after the vacuum in the bag reaches a set value, and performing vacuum leak detection to ensure that the vacuum meets the requirements.
As a further definition of the invention, step 5) specifically comprises: cold pressing test is needed before curing: and connecting the product to an autoclave vacuum system, performing three-suction one-measurement, applying pressure in the autoclave, wherein the vacuum bag is required to have vacuum pressure below a set value, the vacuum is not reduced in set time, and after cold pressing is qualified, discharging the cold pressing, and performing a curing procedure.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the carbon fiber prepreg as the raw material, so that the strength of the product is effectively improved, the shell manufactured by the method does not contain any metal, the density is relatively low, and the requirements of small quality and light weight are met; the composite material is formed by adopting an autoclave process, so that the porosity of the composite material is reduced, and the structural strength of the composite material is improved; the external dimension is controlled by adopting the female die, so that the structural dimension and the raw material utilization rate of the product can be effectively ensured; the preformed mould is introduced, so that the operability of the prepreg paving process is improved, and the production efficiency and the product qualification rate can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a schematic view of a molding die according to the present invention.
FIG. 4 is a schematic view of a preform mold according to the present invention.
FIG. 5 is a schematic view of the lower die structure of the present invention.
FIG. 6 is a cross-sectional view of a molding die according to the present invention.
Fig. 7 is a schematic view of a housing structure made by the present invention.
The forming die comprises a forming die 100, an upper die 101, a demolding hole 101a, an upper flanging 101b, an upper top edge 101c, a lower die 102, a hollow 102a, a reinforcing rib 102b, a lower flanging 102c, a lower bottom edge 102d, a 103 bolt, an upper lifting lug 104, a lower lifting lug 105, a die cavity 106, a 107 positioning pin and a pre-forming die 200.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method of forming a composite ellipsoidal shell as shown in fig. 1-7, comprising the steps of:
Step 1) material preparation: taking out the carbon fiber double-horse prepreg from the cold storage, and cooling for more than 6 hours at room temperature for later use; and cutting the prepreg by using an automatic cloth cutting machine, and counting the number of the sheets.
Step 2) preparing a die: the molds include a molding mold 100 and a preform mold 200.
The forming die 100 comprises an upper die 101 and a lower die 102 which are integrally dish-shaped, an ellipsoidal die cavity 106 is formed in the inner surface of the upper die 101 and the lower die 102 after being in butt joint, an upper flange 101b is arranged on the periphery of the upper die 101, a lower flange 102c is arranged on the periphery of the lower die 102, the upper flange 101b is connected with the lower flange 102c through bolts 103, the lower flange 102c is of a right-angle structure, a hollowed-out 102a is adopted between the lower flange 102c and the lower die 102, a reinforcing rib 102b is further arranged, an upper lifting lug 104 is arranged on the upper flange 101b, a lower lifting lug 105 is arranged on the side surface of the lower flange 102c, the upper flange 101b is connected with the lower flange 102c through a positioning pin 107, a demoulding hole 101a is formed in the upper flange 101b, an upper top edge 101c is arranged on the upper edge of the upper die 101, and a lower bottom edge 102d is arranged on the lower edge of the lower die 102.
In this embodiment, 1 pre-forming mold 200 is adopted, the pre-forming mold 200 is C-shaped, the outer surface of the pre-forming mold 200 is consistent with the inner surfaces of the upper mold 101 and the lower mold 102, and the interior of the pre-forming mold 200 is hollow.
Tightening an upper die 101 and a lower die 102 of a forming die 100 by using bolts 103, cleaning the inner surface of the forming die 100 by using acetone, and coating the die surface by using a release agent for more than 3 times; when the mould is used for the first time, the mould is fully cleaned and smeared with a release agent after degreasing.
The preformed mold 200 needs to be repeatedly used and demoulded for a plurality of times, in order to prevent the release agent from being transferred to the prepreg and affecting the internal quality of the product, the surface of the mold is paved with release cloth instead of being smeared with the release agent; in order to ensure that the pre-forming die 200 is convenient to release and the surface of the pre-forming die is not affected by sticking the release cloth, the surface of the pre-forming die needs to be stuck with the release cloth with the thickness of 0.1mm, butt joint of the seam positions of the release cloth is ensured, and the release cloth is tightly pressed with the pre-forming die 200 by utilizing vacuum bag for pumping.
The invention has the advantages of simple structure, ensuring the surface finish degree of the product and the contour tolerance of the product, and effectively controlling the requirements of product size precision, along with good layering operation, easy product demoulding operation and the like.
Step 3) paving:
The paving sequence is [ +45/-45/0/90/+45/-45/90/0/-45/+45], and 10 layers are added.
The axial direction is 0 DEG, and the peripheral allowance of the material sheet is 10mm; manufacturing a half spherical shell by using a pre-forming die 200, pre-pumping one layer by using a vacuum bag every time, dividing 10 layers of prepregs into three parts in a 3-4-3 layer combination mode, and paving 6 half spherical shells on the pre-forming die 200, wherein each two half spherical shells are combined into one group; and then putting the hemispherical shells into the forming die 100 in sequence, and rolling the hemispherical shells into a solid state and pre-drawing the hemispherical shells by using a vacuum bag after putting the hemispherical shells into the forming die 100, so as to ensure that the hemispherical shells are adhered to the forming die 100.
Butt joint is adopted when the prepreg is paved and pasted, the splicing gap is less than or equal to 1mm, the butt joint is not allowed along the fiber direction, and the splicing seams are required to be staggered when the upper layer and the lower layer are paved and pasted; when the half spherical shells are paved and attached to the forming die 100, the half spherical shells are butted in pairs, the upper layer and the lower layer are paved and attached in staggered and butted positions, and butt joints are placed once every 60 degrees.
It should be noted that, the molding die 100 and the pre-molding die 200 are placed in an oven or a heating table in advance to heat the materials to 40 ℃, so that the prepreg is soft and viscous after being heated, which is helpful for paving the prepreg, separating the hemispherical shell from the die, and pasting the hemispherical shell on the molding die 100, and is limited by the size of the die, and when the prepreg is directly paved on the molding die 100 (female die), the visual field is poor, the space is small, and the paving effect and the paving efficiency are greatly affected; the prepreg is preformed by a male mold and then transferred to a female mold for curing. And manufacturing the prepreg into a hemispherical shell during preforming, and butting the two hemispherical shells to form an ellipsoid matched with the cavity. Through practical fumbling, the half spherical shell is not too thick, the lamination effect of the half spherical shell and the forming die 100 can be affected when the thickness of the half spherical shell exceeds 0.5mm, and the lamination can be prevented from being affected when the half spherical shell is too thick by grouping the layers according to 3-4-3 in consideration of the thickness of the prepreg.
And 4) bag making:
Arranging a high-temperature curing auxiliary material: sequentially placing stripping cloth, non-porous isolating film, ventilated felt (spread around), high temperature vacuum bag film, etc. on the upper surface of the part blank.
And (3) placing a vacuum nozzle (three-suction one-measurement) for vacuumizing, removing vacuumizing when the vacuum in the bag reaches-85 KPa (-0.085 MPa), checking whether a bridging place exists between the bag and the tool, and if so, opening the vacuum and leveling the bridging.
And continuously vacuumizing, carrying out vacuum leak detection, and sealing the vacuum bag if the vacuum pressure drop is not more than 10KPa (0.01 MPa) within 10 minutes. If the vacuum drop pressure exceeds 10KPa (0.01 MPa), checking the air leakage condition of the vacuum bag until the vacuum drop pressure meets the requirement.
It should be noted that if the initial vacuum bag is less than-85 KPa, the vacuum bag will be greatly reduced or even positive under the high temperature and high pressure of the autoclave, which is not beneficial to the quality of the product.
Step 5) curing:
The cold pressing test is carried out before curing, namely the product is connected to an autoclave vacuum system, three pumps and one test are carried out, 500KPa pressure is applied in the autoclave, the vacuum bag needs to have vacuum pressure below-85 KPa, and the vacuum does not drop by more than 10KPa (0.01 MPa) within 10 min.
After the cold pressing is qualified, the cold pressing is released, and a curing program is set according to the curing parameters in fig. 5, wherein the curing program is as follows:
a. the whole process of vacuumizing (three vacuumizing and one measuring) is required, the vacuum degree is not less than-0.085 MPa, and the whole process of heating is carried out at 0.5 ℃/min.
And b, preserving the temperature at 100 ℃ for 1h.
C, pressurizing to 0.3MPa at 125 ℃, preserving heat for 30min, pressurizing to 0.5MPa, and preserving heat for 1h.
D. heating to 170 ℃, and preserving heat for 3 hours at 170 ℃.
E, preserving the temperature at 210 ℃ for 5 hours.
F. Cooling to below 60 ℃ at a cooling rate of 2 ℃ and taking out the workpiece.
Step 6) demolding: the vacuum bag is disassembled, surface fibers need to be prevented from being torn when auxiliary materials are removed, the upper die 101 and the lower die 102 are opened after the bolts 103 are unscrewed, and products are lifted up and the edges of the dies are knocked by a copper hammer so that the products and the dies can be separated.
Step 7) nondestructive testing: nondestructive testing is carried out according to the ultrasonic testing of the 1 st part (GJB 1038.1A) of the nondestructive testing method of the fiber reinforced composite material, and the testing result meets the HB 7224 primary acceptance requirement.
Step 8) cutting: cutting by an air mill according to the cutting line to obtain the required product.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (5)
1. The forming method of the ellipsoidal shell of the composite material is characterized by comprising the following steps of:
Step 1) material preparation: cutting carbon fiber prepreg sheets at all angles required by layering for later use;
Step 2) preparing a die: the mold is divided into a forming mold (100) and a preforming mold (200), wherein the forming mold (100) is of a disc-shaped structure, an ellipsoidal cavity is formed in the inner side of the forming mold, the preforming mold (200) is of a C-shaped structure, if the two preforming molds (200) are in butt joint, an ellipsoidal structure can be formed, and the outer surface of the preforming mold (200) is consistent with the inner surface of the forming mold (100); cleaning the surface to be paved of the mold, coating the surface of the mold by using a release agent, and abutting the surface of the preformed mold (200) at the positions where release cloth is required to be adhered and joints are required to be butted, so that the surface is smooth;
step 3) paving: firstly paving and manufacturing a hemispherical shell on the outer surface of a preformed mould (200), and then transferring the preformed hemispherical shell into a forming mould (100);
And 4) bag making: sequentially placing a piece of stripping cloth, a non-porous isolating film, an air felt and a vacuum bag film on the upper surface of the part blank to manufacture a solidified vacuum bag;
Step 5) curing: heating, pressurizing and solidifying by using an autoclave;
Step 6) demolding: and removing the shell from the die to obtain the composite ellipsoidal shell.
2. The method for forming an ellipsoidal shell of a composite material according to claim 1, wherein the mold in step 2) specifically comprises:
The forming die (100) comprises an upper die (101) and a lower die (102) which are integrally dish-shaped, wherein an ellipsoidal die cavity (106) is formed on the inner surface of the upper die (101) and the lower die (102) after being in butt joint;
And a preforming mold (200), wherein the single preforming mold (200) is integrally C-shaped, and the outer surface of the single preforming mold is consistent with the inner surface of the upper mold (101) and the lower mold (102).
3. The method for forming an ellipsoidal shell of a composite material according to claim 1 or 2, wherein step 3) specifically comprises:
Heating a pre-forming die (200) and a forming die (100) in advance to enable the temperature of the die to reach a preset temperature, manufacturing a hemispherical shell by using the pre-forming die (200), pre-pumping a vacuum bag once for each layer, and dividing the prepreg into three groups from inside to outside for paving; then taking off the hemispherical shell from the pre-forming die (200), putting the hemispherical shell into the forming die (100), rolling the hemispherical shell into a solid state after putting the hemispherical shell into the forming die, and pre-drawing the hemispherical shell by using a vacuum bag to ensure that the hemispherical shell is adhered to the forming die (100);
Butt joint is adopted when the prepreg is paved and pasted, the splicing gap is smaller than the set size, the butt joint is not allowed along the fiber direction, and the splicing seams are required to be staggered when the upper layer and the lower layer are paved and pasted; when the half spherical shells are paved and stuck on the forming die (100), the half spherical shells are butted in pairs, and the upper layer and the lower layer are paved and stuck at staggered butted positions.
4. The method for forming an ellipsoidal shell of a composite material according to claim 1 or 2, wherein step 4) specifically comprises:
the high-temperature curing auxiliary material is adopted: sequentially placing a piece of peeling cloth, a non-porous isolating film, an air felt and a high-temperature vacuum bag film on the inner surface of the inner shell of the forming die (100);
Placing a vacuum nozzle for vacuumizing, removing vacuumizing after the vacuum in the bag reaches a set value, checking whether a bridging place exists between the bag and the tool, and if so, leveling;
and continuously vacuumizing, removing vacuumizing after the vacuum in the bag reaches a set value, and performing vacuum leak detection to ensure that the vacuum meets the requirements.
5. The method for forming an ellipsoidal shell of a composite material according to claim 1 or 2, wherein step 5) specifically comprises: cold pressing test is needed before curing: and connecting the product to an autoclave vacuum system, performing three-suction one-measurement, applying pressure in the autoclave, wherein the vacuum bag is required to have vacuum pressure below a set value, the vacuum is not reduced in set time, and after cold pressing is qualified, discharging the cold pressing, and performing a curing procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410455568.6A CN118046596A (en) | 2024-04-16 | 2024-04-16 | Forming method of composite material ellipsoidal shell |
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| CN202410455568.6A CN118046596A (en) | 2024-04-16 | 2024-04-16 | Forming method of composite material ellipsoidal shell |
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| CN118046596A true CN118046596A (en) | 2024-05-17 |
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| CN202410455568.6A Pending CN118046596A (en) | 2024-04-16 | 2024-04-16 | Forming method of composite material ellipsoidal shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119704711A (en) * | 2024-10-29 | 2025-03-28 | 上海交通大学 | Manufacturing method and system of implosion protection spherical pressure-resistant structure suitable for deep sea submersible vehicle |
| CN120840109A (en) * | 2025-09-22 | 2025-10-28 | 江苏新扬新材料股份有限公司 | Composite material concave rotating body mold and structural part forming method |
-
2024
- 2024-04-16 CN CN202410455568.6A patent/CN118046596A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119704711A (en) * | 2024-10-29 | 2025-03-28 | 上海交通大学 | Manufacturing method and system of implosion protection spherical pressure-resistant structure suitable for deep sea submersible vehicle |
| CN120840109A (en) * | 2025-09-22 | 2025-10-28 | 江苏新扬新材料股份有限公司 | Composite material concave rotating body mold and structural part forming method |
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