CN114290708A - Integrated forming preparation process for large-size carbon fiber plate type workpiece - Google Patents
Integrated forming preparation process for large-size carbon fiber plate type workpiece Download PDFInfo
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- CN114290708A CN114290708A CN202111652357.4A CN202111652357A CN114290708A CN 114290708 A CN114290708 A CN 114290708A CN 202111652357 A CN202111652357 A CN 202111652357A CN 114290708 A CN114290708 A CN 114290708A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 48
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005192 partition Methods 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 238000005056 compaction Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 7
- 238000000638 solvent extraction Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011825 aerospace material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
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- 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
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- Moulding By Coating Moulds (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an integrated forming preparation process for a large-size carbon fiber plate type part, and belongs to the field of carbon fiber plate type integrated processes. According to the method, a large-size carbon fiber plate type workpiece is divided into a plurality of small-size laying areas, the grouped laying areas are pre-pressed first, the pre-pressing compaction of the pre-pressing materials in each grouped laying area is guaranteed, then the whole area-dividing placement is carried out, the whole skin is laid, the mold closing is carried out, the pre-pressing compaction of the pre-pressing materials is achieved through the grouped pre-pressing, only the skin and the pre-pressing materials of the partitioned workpieces are guaranteed to be compact during the whole mold closing, and the process difficulty is reduced. The preparation process of the carbon fiber is feasible, the large-size carbon fiber plate type part can be integrally formed, the high rigidity and the high stability of the carbon fiber plate type part are ensured, and the application of the carbon fiber part in the field of aerospace is promoted.
Description
Technical Field
The invention belongs to the field of carbon fiber plate type integrated processes, and particularly relates to an integrated forming preparation process for a large-size carbon fiber plate type workpiece.
Background
With the development of space remote sensors towards large caliber and long focal length, the space camera supporting structure adopting the traditional metal material can not meet the requirement of ensuring high stability of relative positions among optical elements borne by the space camera supporting structure under the constraint of limited weight, so that the carbon fiber composite material is a novel aerospace material with good application prospect in the technical field of space remote sensing. Compared with the traditional material, the carbon fiber composite material has the advantages of small density, high specific strength and specific modulus, designable performance, good fatigue resistance and vibration resistance, good high temperature resistance and breakage resistance, easy processing and the like.
At present, two common process schemes are adopted for carbon fiber plate type workpieces, firstly, the plate shell workpieces are spliced through screws and bolts, the process is simple, but the assembly stress of large-size plate type workpieces is large, and the method is suitable for structural parts with low stability requirements; and secondly, carbon fiber plate type parts are integrally molded, the conventional process is a prepreg metal matched die pressurizing process, the process is mature for small-size structural parts, but the defects of insufficient curing pressure, easy delamination, large porosity and the like exist for large-size carbon fiber plate frame parts.
The common technical scheme of the large-size carbon fiber plate-type part is a metal matched die and mechanical pressurization process, and the preparation flow is shown in figure 1. Manufacturing and cutting a prepreg according to the process requirements, laying the prepreg on the surface of a soluble core mold layer by layer according to the designed laying angle and the laying sequence, stacking the soluble core mold with the laid prepreg and a metal mold according to the geometric characteristics of a product, pressurizing, and heating and curing the mold under the state of keeping the pressure. From the perspective of cost and simplified process, large-size carbon fiber plate type workpieces are subjected to mold assembly by mechanical pressurization, the principle is that pressure is applied from the outer surface of a model, the pressure is transmitted to the center of the workpiece through a mold and a soluble core mold, laid prepregs are compacted, and the side surfaces of the carbon fiber plate type workpieces are subjected to mechanical pressurization as shown in figure 3. In the actual production process, the soluble core mold is not a rigid body, the pressure is gradually reduced from outside to inside, and after a certain distance, the pressure disappears, as shown in the area indicated by the dotted line in the center of fig. 3, so that the carbon fiber in the area is easy to have the defects of layering, dispersion, large porosity and the like, and the product is an unqualified product.
Disclosure of Invention
The invention aims to solve the problem of insufficient curing pressure of a large-size carbon fiber plate frame part in the prior art, and provides an integrated forming preparation process of a large-size carbon fiber plate type part.
The invention provides a large-size carbon fiber plate type part integrated forming preparation process, which comprises the following steps:
the method comprises the following steps: dividing the large-size carbon fiber plate type structural part into a plurality of grouped laying areas;
step two: stacking the cut soluble core mould prepreg into a soluble core mould layer by layer according to the designed ply angle and ply sequence, and finishing the laying of all the soluble core mould prepreg;
step three: putting the soluble core mould paved with the soluble core mould prepreg in a partition manner;
step four: prepressing one set of laying areas, specifically: stacking a soluble core mold laid with prepreg and a partition pre-pressing tool lower plate, installing 4 partition pre-pressing tool lining plates on the periphery, installing 4 partition pre-pressing tool side plates on the outer sides of the lining plates, and connecting the side plates by fastening screws; mounting pre-pressing screws, adjusting the intervals between the 4 partition pre-pressing tool side plates and the 4 partition pre-pressing tool lining plates, and fastening the partition pre-pressing tool side plates and the partition pre-pressing tool lower plates by using fastening screws; installing a partition pre-pressing tool upper plate, fixedly connecting the partition pre-pressing tool upper plate with a partition pre-pressing tool side plate through fastening screws, completing pre-pressing on one group of laying areas by adjusting the pre-pressing screws, removing all tools after the pre-pressing is completed, and completing the pre-pressing of all the grouped laying areas according to the process;
step five: sequentially stacking all the grouped laying areas which are subjected to prepressing to a lower plate of an integral prepressing tool, laying an integral skin, after the laying of the integral skin is finished, mounting a lining plate, a side plate of the integral prepressing tool and prepressing screws, adjusting the interval between the mounting lining plate and the side plate of the integral prepressing tool through the prepressing screws, after the adjustment is finished, fixedly connecting the side plate of the integral prepressing tool with the lower plate of the integral prepressing tool through fastening screws, mounting an upper plate of the integral prepressing tool, fixedly connecting the upper plate of the integral prepressing tool with the side plate of the integral prepressing tool through the fastening screws, and finishing integral prepressing, cold die assembly and hot die assembly through adjusting the prepressing screws;
step six: hoisting the mold and the carbon fiber prepreg product into a curing furnace integrally, connecting a thermocouple, closing a tank door, setting process parameters according to a curing temperature curve, and curing under a pressure-keeping state;
step seven: and after the heat preservation is finished and the mold is cooled to the room temperature, stopping the curing process, opening the curing furnace, taking out the mold and the cured carbon fiber prepreg product, removing the metal mold and cleaning the soluble core mold to obtain the large-size carbon fiber plate-type product.
Preferably, the first step is divided into 2 to 6 sub-grouped placement zones.
Preferably, the cooling temperature in the fifth step is room temperature.
Preferably, the heat-sealing temperature in the fifth step is 40-60 ℃.
The invention has the advantages of
The invention provides an integrated forming preparation process of a large-size carbon fiber plate type workpiece, the large-size carbon fiber plate type workpiece is divided into a plurality of small-size laying areas according to structural characteristics, the laying areas are pre-pressed in groups firstly, the pre-pressing of the pre-pressing materials in each group laying area is guaranteed to be compact, then the whole area-division placing is carried out, the whole skin is laid, the mold closing is carried out, the pre-pressing materials are compact through the area-division pre-pressing, only the skin and the pre-pressing materials of each block type workpiece are required to be compact during the whole mold closing, and the process difficulty is reduced. Tests show that the carbon fiber preparation process is feasible, large-size carbon fiber plate type parts can be integrally formed, high rigidity and high stability of the carbon fiber plate type parts are guaranteed, and application of the carbon fiber parts in the field of aerospace is promoted.
Drawings
FIG. 1 is a flow chart of a conventional prepreg metal matched die pressing process;
FIG. 2 is a process flow diagram of the prepreg metal matched die pressurization process of the present invention;
FIG. 3 is a schematic side view of a carbon fiber plate-type part under a conventional process;
fig. 4 is a schematic view of a partition scheme of a carbon fiber plate type structural member according to embodiment 1 of the present invention;
FIG. 5 is a process layering of carbon fiber plate type structural member ribs;
FIG. 6 is a front view of the component placement area prepressing in example 1 of the present invention;
FIG. 7 is a side view of the component placement area prepressing in example 1 of the present invention;
FIG. 8 is a front view of the overall prepressing of embodiment 1 of the present invention;
fig. 9 is a side view of the overall preload of embodiment 1 of the present invention.
In the figure, 1. soluble core mould prepreg; 2. integral skin covering; 3. carrying out partition prepressing on the upper plate; 4. fastening screws; 5. a side plate a of the sectional prepressing tool; 6. prepressing screws; 7. a lower plate of the partition pre-pressing tool; 8. a side plate b of the sectional prepressing tool; 9. prepressing a tooling lining plate a in a partitioning manner; 10. a side plate c of the sectional prepressing tool; 11. b, prepressing a tooling lining plate b in a partitioning manner; 12. c, prepressing a tooling lining plate in a partitioning manner; 13. a soluble core mold; 14. a tooling lining plate d is prepressed in a partitioning manner; 15. a side plate d of the sectional prepressing tool; 16. integrally prepressing the upper plate of the tool; 17. integrally prepressing a tooling side plate; 18. integrally prepressing a lower plate of the tooling; 19. a liner plate.
Detailed Description
Embodiment 1 a large-size carbon fiber plate-type part integrated molding preparation process, as shown in fig. 2, includes:
the method comprises the following steps: dividing the large-size carbon fiber plate type structural part into 6 grouped laying areas, wherein a specific partition scheme schematic diagram is shown in fig. 4;
step two: stacking the cut soluble core mould prepreg 1 into a soluble core mould 13 layer by layer according to the designed ply angle and ply sequence, and finishing the laying of all the soluble core mould prepreg;
step three: putting the soluble core mould paved with the soluble core mould prepreg in a partition manner;
step four: as shown in fig. 5, the carbon fiber plate type structural member rib is divided into a soluble core mold prepreg 1 and an integral skin 2, and one group of laying areas are pre-pressed, specifically: stacking the soluble core die on which the prepreg is laid and a subarea prepressing tool lower plate 7 according to the dimensional position relationship shown in fig. 6 and 7, and installing a subarea prepressing tool lining plate a9, a subarea prepressing tool lining plate b11, a subarea prepressing tool lining plate c12 and a subarea prepressing tool lining plate d14 on the periphery; installing a subarea pre-pressing tool side plate a5, a subarea pre-pressing tool side plate b8, a subarea pre-pressing tool side plate c10 and a subarea pre-pressing tool side plate d15 on the outer side of the lining plate, and connecting the subarea pre-pressing tool side plate a5, the subarea pre-pressing tool side plate b8, the subarea pre-pressing tool side plate c10 and the subarea pre-pressing tool side plate d15 by fastening screws 4; mounting pre-pressing screws 6, adjusting the intervals between the 4 subarea pre-pressing tool side plates and the 4 subarea pre-pressing tool lining plates, and fastening the subarea pre-pressing tool side plate a5, the subarea pre-pressing tool side plate b8, the subarea pre-pressing tool side plate c10 and the subarea pre-pressing tool side plate d15 with a subarea pre-pressing tool lower plate 7 by using fastening screws 4; installing the subregion pre-compaction frock upper plate 3 to it links firmly with subregion pre-compaction frock curb plate a5, subregion pre-compaction frock curb plate b8, subregion pre-compaction frock curb plate c10 and subregion pre-compaction frock curb plate d15 with fastening screw 4, through adjusting pre-compaction screw 6, accomplishes the pre-compaction to the district is put in groups, demolish all frocks after the pre-compaction is accomplished, according to above-mentioned flow, accomplish the pre-compaction of all district of putting in groups.
Step five: according to the method, all grouped laying areas which are pre-pressed are sequentially stacked to a lower plate 18 of an integral pre-pressing tool and a whole skin 2 is laid, after the whole skin 2 is laid, a lining plate 19, a side plate 17 of the integral pre-pressing tool and a pre-pressing screw 6 are installed, the interval between the installation lining plate 19 and the side plate 17 of the integral pre-pressing tool is adjusted through the pre-pressing screw 6, after the adjustment is finished, the side plate 17 of the integral pre-pressing tool is fixedly connected with the lower plate 18 of the integral pre-pressing tool through a fastening screw 4, an upper plate 16 of the integral pre-pressing tool is installed and fixedly connected with the side plate 17 of the integral pre-pressing tool through the fastening screw 4, and the integral pre-pressing, cold die assembly and hot die assembly are completed through adjusting the pre-pressing screw 6; the cold sealing temperature is 20 ℃ and the heat sealing temperature is 50 ℃;
step six: hoisting the mold and the carbon fiber prepreg product into a curing furnace integrally, connecting a thermocouple, closing a tank door, setting process parameters according to a curing temperature curve, and curing under a pressure-keeping state;
step seven: and after the heat preservation is finished and the mold is cooled to the room temperature, stopping the curing process, opening the curing furnace, taking out the mold and the cured carbon fiber prepreg product, removing the metal mold and cleaning the soluble core mold to obtain the large-size carbon fiber plate-type product.
Claims (4)
1. The integral forming preparation process of the large-size carbon fiber plate type part is characterized by comprising the following steps of:
the method comprises the following steps: dividing the large-size carbon fiber plate type structural part into a plurality of grouped laying areas;
step two: stacking the cut soluble core mould prepreg into a soluble core mould layer by layer according to the designed ply angle and ply sequence, and finishing the laying of all the soluble core mould prepreg;
step three: putting the soluble core mould paved with the soluble core mould prepreg in a partition manner;
step four: prepressing one set of laying areas, specifically: stacking a soluble core mold laid with prepreg and a partition pre-pressing tool lower plate, installing 4 partition pre-pressing tool lining plates on the periphery, installing 4 partition pre-pressing tool side plates on the outer sides of the lining plates, and connecting the side plates by fastening screws; mounting pre-pressing screws, adjusting the intervals between the 4 partition pre-pressing tool side plates and the 4 partition pre-pressing tool lining plates, and fastening the partition pre-pressing tool side plates and the partition pre-pressing tool lower plates by using fastening screws; installing a partition pre-pressing tool upper plate, fixedly connecting the partition pre-pressing tool upper plate with a partition pre-pressing tool side plate through fastening screws, completing pre-pressing on one group of laying areas by adjusting the pre-pressing screws, removing all tools after the pre-pressing is completed, and completing the pre-pressing of all the grouped laying areas according to the process;
step five: sequentially stacking all the grouped laying areas which are subjected to prepressing to a lower plate of an integral prepressing tool, laying an integral skin, after the laying of the integral skin is finished, mounting a lining plate, a side plate of the integral prepressing tool and prepressing screws, adjusting the interval between the mounting lining plate and the side plate of the integral prepressing tool through the prepressing screws, after the adjustment is finished, fixedly connecting the side plate of the integral prepressing tool with the lower plate of the integral prepressing tool through fastening screws, mounting an upper plate of the integral prepressing tool, fixedly connecting the upper plate of the integral prepressing tool with the side plate of the integral prepressing tool through the fastening screws, and finishing integral prepressing, cold die assembly and hot die assembly through adjusting the prepressing screws;
step six: hoisting the mold and the carbon fiber prepreg product into a curing furnace integrally, connecting a thermocouple, closing a tank door, setting process parameters according to a curing temperature curve, and curing under a pressure-keeping state;
step seven: and after the heat preservation is finished and the mold is cooled to the room temperature, stopping the curing process, opening the curing furnace, taking out the mold and the cured carbon fiber prepreg product, removing the metal mold and cleaning the soluble core mold to obtain the large-size carbon fiber plate-type product.
2. The integrated forming and preparation process of the large-size carbon fiber plate-type workpiece according to claim 1, wherein the step one is divided into 2-6 grouped laying areas.
3. The integrated forming preparation process of the large-size carbon fiber plate-type part according to claim 1, wherein the temperature of the condensation in the fifth step is room temperature.
4. The integrated forming preparation process of the large-size carbon fiber plate-type workpiece according to claim 1, wherein the heat-bonding temperature in the fifth step is 40-60 ℃.
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| CN202111652357.4A CN114290708B (en) | 2021-12-30 | 2021-12-30 | Integrated molding preparation process for large-size carbon fiber plate-type workpiece |
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| CN202111652357.4A CN114290708B (en) | 2021-12-30 | 2021-12-30 | Integrated molding preparation process for large-size carbon fiber plate-type workpiece |
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| CN114290708B CN114290708B (en) | 2024-04-26 |
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