CN117644668A - Mould of composite material bulkhead and manufacturing method of bulkhead - Google Patents
Mould of composite material bulkhead and manufacturing method of bulkhead Download PDFInfo
- Publication number
- CN117644668A CN117644668A CN202311601907.9A CN202311601907A CN117644668A CN 117644668 A CN117644668 A CN 117644668A CN 202311601907 A CN202311601907 A CN 202311601907A CN 117644668 A CN117644668 A CN 117644668A
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- China
- Prior art keywords
- die
- fixing block
- frame forming
- mouth frame
- positioning
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 238000005056 compaction Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 17
- 239000007769 metal material Substances 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 229910052755 nonmetal Inorganic materials 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- 238000000465 moulding Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention relates to the technical field of composite material bulkhead preparation, and discloses a die of a composite material bulkhead and a manufacturing method of the bulkhead, wherein the die comprises the steps of paving prepreg layers layer by layer on a port frame forming module; the lower positioning and fixing block is placed in the lower die, a plurality of port frame forming modules are fixed on the lower positioning and fixing block, and then the twisted strip filling area is filled with prepreg layers; placing the same number of mouth frame forming modules on a plurality of mouth frame forming modules fixed on a lower positioning and fixing block, fixing the mouth frame forming modules on an upper positioning and fixing block, and filling the mouth frame forming modules in a twisting strip filling area by using prepreg layering; laying prepreg layering on the outer peripheral surface of the inner die to form a rim; placing an outer die outside the inner die into the lower die; placing an upper die, placing the upper die on a flat plate hot press for heating, heating the temperature of a forming cavity to the softening temperature of a prepreg layer, pressurizing and closing the die by using the flat plate hot press, and demoulding and repairing burrs after heating and curing to obtain the bulkhead.
Description
Technical Field
The invention relates to the technical field of composite material bulkhead preparation, in particular to a die of a composite material bulkhead and a manufacturing method of the bulkhead.
Background
The composite material frame is generally used for main force transmission and bearing structures of products such as airplanes, cabins, projectiles, ship bodies and the like, and is generally composed of structures such as edge strips, webs, reinforcing ribs and the like. In order to meet the requirements of internal quality such as pores and layering, an autoclave is generally selected for forming the composite frame, so that the defects of no layering, dense pores and the like in the composite frame can be ensured, but the autoclave forming process in the prior art has the defects of low efficiency, high cost and high single-sided precision.
Disclosure of Invention
The invention aims to provide a mould of a composite material bulkhead and a manufacturing method of the bulkhead, so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a mould of a composite material bulkhead, comprising:
the lower positioning fixing block is positioned in the lower die;
the upper positioning fixing block is positioned in the upper die, the upper die is buckled with the lower die, a plurality of mouth frame forming modules are respectively arranged on the lower positioning fixing block and the upper positioning fixing block, and the positions and the numbers of the mouth frame forming modules positioned in the lower positioning fixing block are correspondingly arranged with the positions and the numbers of the mouth frame forming modules positioned in the upper positioning fixing block; the mouth frame forming modules are combined to form an inner die, and a plurality of outer dies are arranged outside the peripheral surface of the inner die;
the gaps between the mouth frame forming modules and the gaps between the inner die and the outer die form a forming cavity for loading prepreg layering, and the expansion coefficient of the mouth frame forming modules is larger than that of the lower die, the upper die, the lower positioning fixing block, the upper positioning fixing block and the outer die.
Preferably, the outer mold includes:
an insert block which is abutted against one side surface of the inner die;
one side of the compaction block is propped against the embedded block, and the other side of the compaction block is propped against the inner walls of the upper die and the lower die.
Preferably, the lower positioning fixing block and the upper positioning fixing block are respectively fixed with a plurality of mouth frame forming modules through positioning pins and limiting blocks.
Preferably, a twisted strip filling area is formed in the area between the outer corners of the adjacent mouth frame forming modules.
A method of manufacturing a composite former comprising the steps of:
laying prepreg layers layer by layer on a mouth frame forming module, and carrying out vacuumizing pre-compaction;
the lower positioning and fixing block is placed in a lower die, a plurality of mouth frame forming modules are fixed on the lower positioning and fixing block, and then the lower positioning and fixing block is filled in a twisting strip filling area by using a prepreg layer, and vacuum pumping pre-compaction is carried out;
placing the same number of mouth frame forming modules on a plurality of mouth frame forming modules fixed on a lower positioning and fixing block, fixing the mouth frame forming modules on an upper positioning and fixing block, filling the mouth frame forming modules in a twisting strip filling area by using prepreg layering, and then carrying out vacuumizing pre-compaction;
laying a prepreg layer on the outer peripheral surface of the inner die to form a rim strip, and performing vacuumizing pre-compaction;
placing an outer die outside the inner die into the lower die;
placing an upper die, placing on a flat plate hot press for heating, heating the temperature of a forming cavity to the softening temperature of a prepreg layer, pressurizing and closing the die by using the flat plate hot press, repeating for 3 times for air release, and demoulding and repairing burrs after heating and curing to obtain the bulkhead.
Preferably, the lower die, the upper die, the lower positioning fixing block, the upper positioning fixing block and the outer die are made of metal materials of the same material, and the mouth frame forming module is made of metal materials or nonmetal materials.
Preferably, the die clamping gap is kept to be less than or equal to 0.1mm when the flat plate hot press is used for pressing and die clamping.
Preferably, the insert is placed before the compression block is placed when the outer mold outside the inner mold is placed into the lower mold.
The invention discloses the following technical effects: the invention not only can ensure the internal quality to be layering-free and overcome the defects of dense pores and the like, but also can ensure the precision and the smoothness of each surface, and can greatly improve the production efficiency.
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 needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a mold for a composite former of the present invention;
FIG. 2 is a schematic view of a port frame molding module according to the present invention;
FIG. 3 is a schematic view of the structure of the lower positioning block according to the present invention;
FIG. 4 is a schematic view of the structure of the twisted strip filling area in the present invention;
FIG. 5 is a schematic view of the lower die structure of the present invention;
FIG. 6 is a schematic view of the structure of the upper positioning fixing block in the present invention;
FIG. 7 is a schematic view of a ribbon in accordance with the present invention;
FIG. 8 is a schematic view of the construction of an insert of the present invention;
FIG. 9 is a schematic view of a compact block according to the present invention;
FIG. 10 is a schematic view of the structure of the spacer after demolding in the present invention;
FIG. 11 is a schematic view of the structure of the machined spacer of the present invention;
wherein, 1, lower positioning fixed block; 2. a lower die; 3. an upper positioning fixing block; 4. an upper die; 5. a mouth frame molding module; 6. layering prepreg; 7. an insert; 8. a compaction block; 9. a positioning pin; 10. a limiting block; 11. a stranding filling area; 12. and a rim.
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.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Taking a cross-shaped composite material bulkhead as an example, the bulkhead is composed of a rim 12 and cross ribs, and the rib forms not only comprise the cross shape shown in the case, but also are applicable to the forms of a Chinese character, a T-shaped, an L-shaped and the like. In the case, the cross-shaped composite material frame is firstly decomposed according to a molding manufacturing method, and is divided into 8 mouth frame molding modules 5 with bottom surfaces, the mouth frames are combined back to form cross ribs and inner edge strips, the periphery is an outer edge strip, and a cavity between a cavity at the cross and the edge strip 12 is a twisting strip filling area 11. The prepreg ply 6 in this embodiment is a carbon fiber fabric prepreg. The material A is P20 die steel, the material B is nylon 66, and the curing temperature is 120-150 ℃.
Firstly, testing to obtain the thickness t of the carbon fiber fabric prepreg after single-layer curing under the state of no internal defects 1 And the uncured thickness of the prepreg is t 0 Since the curing process is required to be heated and pressurized in order to obtain a part having no internal defects, t 0 ＞t 1 Setting the number of the layers as n, wherein the absolute zero gap between the layers cannot be ensured in the layering process, and the gaps are needed to exist, and the actual uncured total thickness after the test and the application is t 2 And t 2 ＞nt 0 ＞nt 1 。
The lower die 2, the upper die 4, the lower positioning and fixing block 1, the upper positioning and fixing block 3 and the outer die are made of the same material metal material, and are marked as a material A, and the mouth frame forming die 5 is made of a metal material or a non-metal material, and is marked as a material B.
To make t of the spread 2 Can obtain nt after curing 1 The invention adopts materials with different thermal expansion coefficients as the die materials A and B. Calculation of t-nt 1 ＝ΔT(α B L-α A L), the expansion coefficient of B is large, and t is determined by the expansion difference at the curing temperature 2 As infinitely close as possible to compacted to nt 1 。
Wherein,
t1: a prepreg monolayer cured thickness;
t2: paving n layers of uncured total thickness of the prepreg;
t0: the uncured thickness of the prepreg monolayer;
n: number of prepreg layups;
Δt: temperature difference before and during curing;
α A : the thermal expansion coefficient of the material A;
α B : the thermal expansion coefficient of the material B;
l: the edge length of the mouth frame forming module.
Let the thickness of the die cavity at room temperature be t 3 ，t 3 ＜t 2 The invention adopts a designed mould structure, firstly, the prefabricated body and the mouth frame forming module 5 are put into the mould cavity, then the embedded block 7 and the compression block 8 are put into the lower mould 2, the thickness of the prefabricated body is larger than that of the mould cavity, the embedded block 7 and the compression block 8 are completely put in place, the upper mould 4 is covered and put into a flat plate hot press, the mould is closed when a certain temperature is reached, the mould blocks are in place by the extrusion of the upper mould 4 to the compression block 8, the prepreg is softened at the moment, the elimination of layer shearing gas is facilitated, and the product without defects inside is achieved.
The invention is applicable to various fiber reinforced prepregs and sheet soft unvulcanized materials, and is not only applicable to the materials used in the embodiment.
Referring to fig. 1, a mold for a composite former, comprising:
the lower positioning fixing block 1 is positioned in the lower die 2;
the upper positioning and fixing block 3 is positioned in the upper die 4, the upper die 4 is buckled with the lower die 2, a plurality of mouth frame forming modules 5 are respectively arranged on the lower positioning and fixing block 1 and the upper positioning and fixing block 3, and the mouth frame forming modules 5 positioned in the lower positioning and fixing block 1 are correspondingly arranged with the mouth frame forming modules 5 positioned in the upper positioning and fixing block 3 in position and quantity; the mouth frame forming modules 5 are combined to form an inner mold, and a plurality of outer molds are arranged outside the peripheral surface of the inner mold;
the gaps between the mouth frame forming modules 5 and the gaps between the inner mold and the outer mold form a forming cavity for loading the prepreg layup 6, and the expansion coefficient of the mouth frame forming modules 5 is larger than that of the lower mold 2, the upper mold 4, the lower positioning fixing block 1, the upper positioning fixing block 3 and the outer mold.
Further, the outer mold includes:
the embedded block 7 is propped against one side surface of the inner die;
one side of the compaction block 8 is propped against the embedded block 7, and the other side of the compaction block 8 is propped against the inner walls of the upper die 4 and the lower die 2.
Further, the lower positioning and fixing block 1 and the upper positioning and fixing block 3 are respectively fixed with a plurality of mouth frame forming modules 5 through positioning pins 9 and limiting blocks 10.
Further, a twisted strip filling area 11 is formed in the area between the outer corners of the adjacent mouth frame forming modules 5.
A method of manufacturing a composite former comprising the steps of:
referring to fig. 2, a prepreg layup 6 is laid layer by layer on a mouth frame molding module 5, and vacuum-pumping precompaction is performed;
referring to fig. 3 to 4, a lower positioning and fixing block 1 is placed in a lower die 2, a plurality of mouth frame forming modules 5 are fixed on the lower positioning and fixing block 1, and then a prepreg layer 6 is filled in a stranding filling area 11, and vacuum pumping pre-compaction is carried out;
referring to fig. 5 to 6, an equal number of mouth frame molding modules 5 are placed on a plurality of mouth frame molding modules 5 fixed on a lower positioning and fixing block 1 and fixed on an upper positioning and fixing block 3, and are filled in a stranding filling area 11 by a prepreg ply 6, and then vacuum pumping pre-compaction is performed;
referring to fig. 7, a prepreg layup 6 is laid on the outer circumferential surface of the inner mold to form a rim 12, and vacuum-pumping pre-compaction is performed;
laying carbon fiber fabric prepreg layer by layer to form an outer edge strip, and combining the outer edge strip with an inner edge strip formed by combining the outer periphery of the mouth frame forming module 5 to obtain an edge strip 12; the laying process is laid as close as possible, and the vacuum pumping pre-compaction at room temperature is selected at proper time.
Referring to fig. 8 to 9, an outer mold outside the inner mold is placed into the lower mold 2;
referring to fig. 1, an upper die 4 is placed, the upper die is placed on a flat hot press for heating, the temperature of a forming cavity is heated to the softening temperature of a prepreg layup 6, the flat hot press is used for pressurizing and closing the die, the die is repeatedly used for air release for 3 times, and after heating and solidification, a separation frame is obtained by demoulding and trimming burrs (as shown in fig. 10); machining may also be performed to design dimensions to obtain a former as shown in figure 11.
Further, the lower die 2, the upper die 4, the lower positioning and fixing block 1, the upper positioning and fixing block 3 and the outer die are made of the same material metal material, and the mouth frame forming module 5 is made of a metal material or a nonmetal material.
Further, when the flat plate hot press is used for pressurizing and closing the mold, the mold closing gap is kept to be less than or equal to 0.1mm.
Heating the molding cavity to softening temperature, wherein the resin has certain fluidity, bubbles are easy to remove, pores are easy to compact, pressurizing and closing the mold by a hot press to enable gaps of the upper mold 2 and the lower mold 2 to be closed as much as possible, repeating the process for 3 times for air release, finally keeping the closing gaps less than or equal to 0.1mm, and heating and curing, wherein the curing temperature is consistent with the required thermal expansion point.
Further, when the outer mold outside the inner mold is placed into the lower mold 2, the insert 7 is placed first and the pressing block 8 is placed second.
The references to orientations or positional relationships of "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the orientations or positional relationships shown in the drawings, are merely for purposes of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. A mold for a composite former, comprising:
the lower positioning fixing block (1) is positioned in the lower die (2);
the upper positioning fixing block (3) is positioned in the upper die (4), the upper die (4) is buckled with the lower die (2), a plurality of mouth frame forming modules (5) are respectively arranged on the lower positioning fixing block (1) and the upper positioning fixing block (3), and a plurality of mouth frame forming modules (5) positioned in the lower positioning fixing block (1) are correspondingly arranged in positions and numbers of the mouth frame forming modules (5) positioned in the upper positioning fixing block (3); the mouth frame forming modules (5) are combined to form an inner die, and a plurality of outer dies are arranged outside the peripheral surface of the inner die;
the mouth frame forming die comprises a plurality of mouth frame forming die modules (5), an inner die and an outer die, wherein gaps between the mouth frame forming die modules (5) and gaps between the inner die and the outer die form a forming cavity for loading prepreg layering (6), and the expansion coefficient of the mouth frame forming die modules (5) is larger than that of the lower die (2), the upper die (4), the lower positioning fixing block (1), the upper positioning fixing block (3) and the outer die.
2. A mould for a composite former as claimed in claim 1, wherein the outer mould comprises:
an insert (7) which is abutted against one side surface of the inner die;
one side of the compaction block (8) is propped against the embedded block (7), and the other side of the compaction block (8) is propped against the inner walls of the upper die (4) and the lower die (2).
3. A mould for a composite former as claimed in claim 2, wherein: the lower positioning and fixing block (1) and the upper positioning and fixing block (3) are respectively fixed with a plurality of mouth frame forming modules (5) through positioning pins (9) and limiting blocks (10).
4. A mould for a composite former according to claim 3, wherein: and a twisting strip filling area (11) is formed in the area between the outer corners of the adjacent mouth frame forming modules (5).
5. A method of manufacturing a composite former, using a mould for a composite former as claimed in claim 4, comprising the steps of:
laying prepreg layers (6) on the mouth frame forming module (5) layer by layer, and carrying out vacuumizing pre-compaction;
the lower positioning and fixing block (1) is placed in the lower die (2), a plurality of mouth frame forming modules (5) are fixed on the lower positioning and fixing block (1), and then the lower positioning and fixing block is filled in the stranding filling area (11) by using the prepreg paving layer (6), and vacuum pumping pre-compaction is carried out;
placing the same number of mouth frame forming modules (5) on a plurality of mouth frame forming modules (5) fixed on a lower positioning and fixing block (1) and on an upper positioning and fixing block (3), filling the mouth frame forming modules into a twisting strip filling area (11) by using a prepreg paving layer (6), and then carrying out vacuumizing pre-compaction;
laying a prepreg layer (6) on the outer peripheral surface of the inner die to form a rim (12), and performing vacuumizing pre-compaction;
an outer die outside the inner die is placed into the lower die (2);
placing an upper die (4), placing on a flat hot press for heating, heating the temperature of a forming cavity to the softening temperature of a prepreg layering layer (6), pressurizing and closing the die by the flat hot press, repeating for 3 times for air release, and demolding and repairing burrs after heating and curing to obtain the bulkhead.
6. A method of manufacturing a composite former as claimed in claim 5 wherein: the lower die (2), the upper die (4), the lower positioning and fixing block (1), the upper positioning and fixing block (3) and the outer die are made of metal materials of the same material, and the mouth frame forming die (5) is made of metal materials or nonmetal materials.
7. A method of manufacturing a composite former as claimed in claim 5 wherein: and (3) keeping the die closing gap smaller than or equal to 0.1mm when the flat plate hot press is used for pressing and die closing.
8. A method of manufacturing a composite former as claimed in claim 5 wherein: when the outer mold outside the inner mold is placed in the lower mold (2), the insert (7) is placed first and then the compression block (8) is placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311601907.9A CN117644668A (en) | 2023-11-28 | 2023-11-28 | Mould of composite material bulkhead and manufacturing method of bulkhead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311601907.9A CN117644668A (en) | 2023-11-28 | 2023-11-28 | Mould of composite material bulkhead and manufacturing method of bulkhead |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117644668A true CN117644668A (en) | 2024-03-05 |
Family
ID=90042737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311601907.9A Pending CN117644668A (en) | 2023-11-28 | 2023-11-28 | Mould of composite material bulkhead and manufacturing method of bulkhead |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117644668A (en) |
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2023
- 2023-11-28 CN CN202311601907.9A patent/CN117644668A/en active Pending
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