CN116001312A - Manufacturing method of slender carbon fiber composite square tube structural member - Google Patents
Manufacturing method of slender carbon fiber composite square tube structural member Download PDFInfo
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- CN116001312A CN116001312A CN202211680162.5A CN202211680162A CN116001312A CN 116001312 A CN116001312 A CN 116001312A CN 202211680162 A CN202211680162 A CN 202211680162A CN 116001312 A CN116001312 A CN 116001312A
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- carbon fiber
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- structural member
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 61
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 61
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000009966 trimming Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims description 15
- 229920001971 elastomer Polymers 0.000 claims description 11
- 238000003892 spreading Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
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Abstract
The invention discloses a manufacturing method of a square tube structural member made of an elongated carbon fiber composite material, which comprises the following steps: the first step: preparing a die: s2: paving and positioning: s3: paving carbon fiber prepreg: s4: and (3) curing and forming parts: s5: and (3) releasing equalizing plates 21 and 22: s6: removing the paving male die: s7: and (3) part detection: s8: and (5) trimming the parts. The invention ensures the precision requirements of the inner and outer molded surfaces of the product, ensures the stability of the demolding quality of the product, adopts flanging for paving in the process of paving the carbon fiber prepreg, plays a role in assisting demolding of the subsequent product, and can slowly demold the male mold by the threaded rod through flanging around the product supported by the ejector rod and the ejector block in the auxiliary tool; after the male die and the slender carbon fiber composite square tube structural member are formed by heating, due to the principles of thermal expansion and cold contraction of the two materials in the curing process, a micro gap can be formed between the inner molded surface of the carbon fiber and the steel male die, and the male die can be slowly pulled out by an auxiliary tool conveniently.
Description
Technical Field
The invention belongs to the technical field of composite material processing, and relates to a manufacturing method of a square tube structural member made of an elongated carbon fiber composite material.
Background
The carbon fiber composite material has been widely used in aerospace products by virtue of the advantages of light weight, high strength, difficult corrosion, convenient molding, attractive quality and the like, and the structure of the composite material part application tends to be simple and lightweight; under the prior art conditions, there is a great difficulty in the composite material forming process, and one type of elongated composite material tubular structural member (see fig. 1) belongs to the type of structure; the composite material part structure is an elongated carbon fiber composite material square pipe structural member, the thickness of the periphery of the product is equal, and the size of an inner cavity is smaller; the size is (50X 60) mm; the length is about 1000mm, the inner and outer surfaces of the slender carbon fiber composite square tube structural member are required to be smooth, particularly, the inner surface is provided with a connecting piece assembling relationship in the follow-up mode, the assembling precision and the size requirement are high, the composite carbon fiber structural member is mainly subjected to load transmission by fibers, polishing and repairing are not allowed in an assembling area, the inner surface size precision requirement of the assembling area is high, and 4R angle areas are required to meet the size requirement, so that the inner surface of the slender carbon fiber composite square tube structural member is required to be molded by virtue of a mold, the inner surface size is required to meet the assembling requirement, but the structural square tube structural member of the part is relatively complex in the existing composite manufacturing process method; mainly embodied in the product demoulding mode, in order to ensure the structural requirement, the existing forming method mainly comprises the following modes:
1. in the demolding process of the part, the inner cavity of the part is small in size, the long and thin structural part is formed by adopting the male die, and the product and the male die are subjected to high-temperature high-pressure heating forming, so that the product and the die are relatively attached; the existing molding method can not separate the product from the male die, so that the product has the quality problem of being unable to be demolded;
2. the female die forming is adopted, the risk of the mode is that the size of the outer molded surface can be ensured, but according to the requirements of the inner molded surface and the R angle area size required by the product, the female die forming mode cannot ensure the requirements, and the matching precision requirement on the subsequent assembly of the product cannot be ensured;
3. adopting an elastomer mould; the method has the advantages that the forming risk of the slender carbon fiber composite square pipe structural member is that the forming requirement on the air bag core mold is high, the air bag core mold needs to be formed independently, the production and combination process is complex, and the production cost is increased;
under the technical background, for the slender carbon fiber composite square tube structural member, the product has simple shape, light weight and smooth inner and outer surfaces, the inner surface size requirement meets the requirement of assembly precision, and the stability of the product quality is improved by controlling the production cost; a breakthrough must be made in the existing molding process; the invention adopts a male die to lay and paste, the outer surface is formed by using a equalizing plate forming die in a combined way, and a demolding auxiliary tool is used for demolding the product on the premise of ensuring the product quality; the technical method completes the manufacture of the square tube structural member made of the slender carbon fiber composite material, better improves the quality of parts, and ensures the assembly accuracy and the size requirement of the inner profile of the product.
Disclosure of Invention
The invention aims to provide a manufacturing method of a square tube structural member made of an elongated carbon fiber composite material, so that the quality of parts is improved, the assembly accuracy and the size requirements of inner molded surfaces of products are ensured, and the production efficiency is improved.
The technical scheme of the invention is as follows:
a manufacturing method of a slender carbon fiber composite square tube structural member comprises the following steps:
s1: preparing a die:
manufacturing a paving male die, a uniform pressure plate forming die and a demolding auxiliary tool, wherein one end of the paving male die is provided with a threaded connection hole, the uniform pressure plate forming die consists of a left half uniform pressure plate and a right half uniform pressure plate, expanded rubber is paved on forming surfaces of the left half uniform pressure plate and the right half uniform pressure plate, assembly sealing is carried out after paving is completed, and curing molding is carried out according to vulcanization parameters; obtaining a left half equalizing plate and a right half equalizing plate with expanded rubber; the demolding auxiliary tool comprises a jacking block, an ejector rod, a threaded seat block, a threaded wrench and a threaded rod, wherein the jacking block is a matched part, the ejector rod is arranged around one side of the threaded seat block respectively, the threaded seat block is provided with the threaded rod, one end of the threaded rod is connected with the threaded wrench, and the other end of the threaded rod penetrates through a central hole of the jacking block to be matched with the threaded connecting hole;
s2: paving and positioning:
combining the top block with the paving male die to enable the top block to be positioned at one end of the paving male die;
s3: paving carbon fiber prepreg:
spreading the carbon fiber prepreg on a spreading male die, and spreading the carbon fiber prepreg along the side edge of the top block towards the periphery except the forming part during spreading to obtain a prepreg carbon fiber square tube;
s4: and (3) curing and forming parts:
paving a layer of release cloth and an isolating film on the surface of the prepreg carbon fiber square tube, combining a left half-equalizing plate and a right half-equalizing plate with expansion rubber on the prepreg carbon fiber square tube, and then carrying out vacuum hot-press molding according to the technological requirements of a composite material autoclave molding method to obtain a part molded body;
s5: and (3) removing the equalizing plate forming die:
removing the left half uniform pressure plate and the right half uniform pressure plate after solidification molding, and loosening the top block;
s6: removing the paving male die:
one end of the threaded rod penetrates through the center hole of the ejector block and then is connected with the threaded connection hole of the paving male die, so that the ejector rod is propped against the ejector block, and the threaded rod pushes the paving male die to be separated from the part forming body through rotating the threaded wrench, so that demolding is completed;
s7: and (3) part detection:
performing nondestructive inspection on the part molded body;
s8: trimming parts:
and (3) processing and trimming the part forming body according to related technical conditions to obtain the slender carbon fiber composite square tube structural member.
Further, the molded surface of the equalizing plate molding die expands 0.12mm on the basis of the outer surface of the carbon fiber square tube part.
Further, the combined surface of the left half pressure equalizing plate and the right half pressure equalizing plate is a step-shaped combined surface.
Further, the upper surface of half equalizing plate in left side is equipped with first outer concave station, and the lower surface is equipped with first concave station, the upper surface of half equalizing plate in right side be equipped with first outer concave station complex second concave station, the lower surface be equipped with first concave station matched second outer concave station.
In the step S3, the thickness of the flange is 1.5-2.5 times of that of the square tube structural member made of the slender carbon fiber composite material.
Further, the length of the threaded rod is 1100mm, and the diameter of the threaded rod is 20mm.
The invention has the beneficial effects that:
in order to ensure the assembly precision requirement of the inner profile of the product, the invention adopts paving male dies for molding, in order to ensure the outer profile of the part to have a flat surface quality, a set of equalizing plate forming dies is customized, in order to ensure the stability of the demolding quality of the product, auxiliary demolding tools are adopted, in order to ensure the stable demolding of the periphery of the product, the product adopts flanging paving in the paving process, the auxiliary demolding effect of the subsequent product is achieved, and the ejector rods and the ejector blocks in the auxiliary tools are propped against the flanging of the periphery of the product, so that the threaded rod can slowly demold the male dies; after the male die and the slender carbon fiber composite square tube structural member are formed by heating, due to the principles of thermal expansion and cold contraction of the two materials in the curing process, a micro gap is formed between the inner molded surface of the carbon fiber and the steel male die, and the male die can be slowly pulled out by an auxiliary tool conveniently; the subsequent series of detection of the carbon fiber composite structural member proves that the product quality meets the related technical requirements.
Drawings
FIG. 1 is a schematic structural view of an elongated carbon fiber composite square tube structural member;
FIG. 2 is a schematic illustration of a male die being applied in an embodiment of the present invention;
FIG. 3 is a schematic view of a mold for forming a uniform pressure plate according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a demolding auxiliary tool in an embodiment of the invention;
FIG. 5 is a schematic diagram of another structure of a demolding auxiliary tool according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing a combination of a mold for forming a uniform pressure plate according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of a paving process according to an embodiment of the present invention;
FIG. 8 is a schematic drawing of a mold release of an embodiment of the present invention;
FIG. 9 is a schematic view of a flange cut-out according to an embodiment of the present invention;
in the figure: paving a male die 1, a uniform pressure plate forming die 2, a demolding auxiliary tool 3, a prepreg carbon fiber square tube 4, a flanging excision 5, a threaded connection hole 11, a left half uniform pressure plate 21, a right half uniform pressure plate 22, a top block 31, a push rod 32, a threaded seat block 33, a threaded wrench 34, a threaded rod 35, a flanging 41, a left half uniform pressure plate first concave platform 211, a left half uniform pressure plate first concave platform 212, a right half uniform pressure plate second concave platform 221 and a right half uniform pressure plate second concave platform 222.
Detailed Description
The present invention will be further described by way of the following examples, however, the scope of the present invention is not limited to the following examples.
Examples: as shown in fig. 1, a method for manufacturing a square tube structural member made of an elongated carbon fiber composite material comprises the following steps:
s1: preparing a die:
firstly, in order to ensure that the assembly dimensional accuracy of the inner molded surface of the square tube structural member made of the slender carbon fiber composite material meets the requirement, a paving male die 1 (see fig. 2) is customized, and one end of the paving male die 1 is provided with a threaded connecting hole 11; in order to ensure that the outer surface of the part has a flat surface quality, a set of pressure equalizing forming die 2 and a soft expansion rubber die after forming (see fig. 3 and 6) are customized, the surface of the pressure equalizing die 2 expands 0.12mm on the basis of the outer surface of the part of the carbon fiber square tube 4, the pressure equalizing plate consists of a left half pressure equalizing plate 21 and a right half pressure equalizing plate 22, expansion rubber is paved on the left half pressure equalizing plate 21 and the right half pressure equalizing plate 22, assembling and sealing are carried out according to the requirements of related process files after the paving is finished, and then curing and forming are carried out by using related heating equipment according to the vulcanization parameters of the soft die, so that the left half pressure equalizing plate 21 and the right half pressure equalizing plate 22 with the expansion rubber are obtained, wherein the combined surface of the left half pressure equalizing plate 21 and the right half pressure equalizing plate 22 is a stepped combined surface, the upper surface of the left half pressure equalizing plate 21 is provided with a first outer concave table 211, the lower surface is provided with a second inner concave table 221 matched with the first outer concave table 211, and the lower surface is provided with a second concave table 222 matched with the first inner concave table 212; in order to ensure smooth demolding of the square tube structural member made of the slender carbon fiber composite material, a set of auxiliary demolding tool (see fig. 4 and 5) is customized, and the demolding auxiliary tool 3 comprises a jacking block 31, a jacking rod 32, a threaded seat block 33, a threaded wrench 34 and a threaded rod 35, wherein the jacking block 31 is a matched part, the jacking rod 32 is respectively arranged on the periphery of one side of the threaded seat block 33, the threaded rod 35 is installed on the threaded seat block 33, one end of the threaded rod 35 is connected with the threaded wrench 34, and the other end of the threaded rod 35 penetrates through a central hole (not shown in the figure) of the jacking block 31 to be matched with the threaded connection hole 11.
S2: paving and positioning:
combining the top block 31 with the paving male die 1, and positioning the top block 31 at one end of the paving male die 1; specifically, the top block 31 can be fixed at one end of the male die paving tool through double-sided adhesive tape (see fig. 7).
S3: paving carbon fiber prepreg:
according to the related requirements of the slender carbon fiber composite square tube structural member, carrying out carbon fiber prepreg paving on the paving male die 1, wherein the whole paving needs to be carried out on the flanging 41 around the top block 31 in the paving process, so as to obtain a prepreg carbon fiber square tube 4; the thickness of the flange 41 is 1.5-2.5 times, preferably 2 times, the thickness of the square tube structural member made of the slender carbon fiber composite material, and the flange 41 can play a role in transferring load, so that the follow-up product can be demoulded (see fig. 7).
S4: and (3) curing and forming parts:
a layer of release cloth and an isolating film, a left half equalizing plate 21 and a right half equalizing plate 22 with expansion rubber are paved on the surface of the prepreg carbon fiber square tube 4 to be combined and pressed on the prepreg carbon fiber square tube 4, and then vacuum bag process combination operation is carried out on the prepreg carbon fiber square tube according to the general process requirements of a composite material autoclave molding method; heating and curing the carbon fiber prepreg in an autoclave according to the technological parameters to obtain the molded part.
S5: and (3) removing the equalizing plate forming die:
removing the vacuum bag and the pressure equalizing left half equalizing plate 21 and the pressure equalizing right half equalizing plate 22; a loose top 31 is close to one end of the part forming body, and the loose top 31 and the paving male die 1 are ensured to be in a loose state (see fig. 8);
s6: removing the paving male die:
one end of a threaded rod 35 penetrates through a central hole of the top block 31 and then is connected with a threaded connection hole 11 of the paving male die 1, so that the ejector rod 2 is propped against the top block 31, and the threaded rod 35 pushes the paving male die 1 to be separated from a part forming body through rotating a thread wrench 34, so that demoulding is completed;
s7: and (3) part detection:
performing nondestructive inspection on the part molded body;
s8: trimming parts:
and (3) processing and trimming the product according to related technical conditions (see fig. 9, cutting off one end of the part forming body with the flanging) to obtain the slender carbon fiber composite square tube structural member.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. A manufacturing method of a slender carbon fiber composite square tube structural member is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing a die:
manufacturing a paving male die, a uniform pressure plate forming die and a demolding auxiliary tool, wherein one end of the paving male die is provided with a threaded connection hole, the uniform pressure plate forming die consists of a left half uniform pressure plate and a right half uniform pressure plate, expanded rubber is paved on forming surfaces of the left half uniform pressure plate and the right half uniform pressure plate, assembly sealing is carried out after paving is completed, and curing molding is carried out according to vulcanization parameters; obtaining a left half equalizing plate and a right half equalizing plate with expanded rubber; the demolding auxiliary tool comprises a jacking block, an ejector rod, a threaded seat block, a threaded wrench and a threaded rod, wherein the jacking block is a matched part, the ejector rod is arranged around one side of the threaded seat block respectively, the threaded seat block is provided with the threaded rod, one end of the threaded rod is connected with the threaded wrench, and the other end of the threaded rod penetrates through a central hole of the jacking block to be matched with the threaded connecting hole;
s2: paving and positioning:
combining the top block with the paving male die to enable the top block to be positioned at one end of the paving male die;
s3: paving carbon fiber prepreg:
spreading the carbon fiber prepreg on a spreading male die, and spreading the carbon fiber prepreg along the side edge of the top block towards the periphery except the forming part during spreading to obtain a prepreg carbon fiber square tube;
s4: and (3) curing and forming parts:
paving a layer of release cloth and an isolating film on the surface of the prepreg carbon fiber square tube, combining a left half-equalizing plate and a right half-equalizing plate with expansion rubber on the prepreg carbon fiber square tube, and then carrying out vacuum hot-press molding according to the technological requirements of a composite material autoclave molding method to obtain a part molded body;
s5: and (3) removing the equalizing plate forming die:
removing the left half uniform pressure plate and the right half uniform pressure plate after solidification molding, and loosening the top block;
s6: removing the paving male die:
one end of the threaded rod penetrates through the center hole of the ejector block and then is connected with the threaded connection hole of the paving male die, so that the ejector rod is propped against the ejector block, and the threaded rod pushes the paving male die to be separated from the part forming body through rotating the threaded wrench, so that demolding is completed;
s7: and (3) part detection:
performing nondestructive inspection on the part molded body;
s8: trimming parts:
and (3) processing and trimming the part forming body according to related technical conditions to obtain the slender carbon fiber composite square tube structural member.
2. The method for manufacturing the square tube structural member made of the slender carbon fiber composite material according to claim 1, wherein the method comprises the following steps: the molded surface of the equalizing plate molding die expands 0.12mm on the basis of the outer surface of the carbon fiber square tube part.
3. The method for manufacturing the square tube structural member made of the slender carbon fiber composite material according to claim 1, wherein the method comprises the following steps: the combined surface of the left half pressure equalizing plate and the right half pressure equalizing plate is a stepped combined surface.
4. A method of making an elongated carbon fiber composite square tube structural member according to claim 3, wherein: the upper surface of half equalizing plate in left side is equipped with first outer concave station, and the lower surface is equipped with first concave station, the upper surface of half equalizing plate in right side be equipped with first outer concave station complex second concave station, the lower surface be equipped with first concave station matched second outer concave station.
5. The method for manufacturing the square tube structural member made of the slender carbon fiber composite material according to claim 1, wherein the method comprises the following steps: and S3, the thickness of the flange is 1.5-2.5 times of that of the square tube structural member made of the slender carbon fiber composite material.
6. The method for manufacturing the square tube structural member made of the slender carbon fiber composite material according to claim 1, wherein the method comprises the following steps: the length of the threaded rod is 1100mm, and the diameter of the threaded rod is 20mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211680162.5A CN116001312A (en) | 2022-12-26 | 2022-12-26 | Manufacturing method of slender carbon fiber composite square tube structural member |
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| CN202211680162.5A CN116001312A (en) | 2022-12-26 | 2022-12-26 | Manufacturing method of slender carbon fiber composite square tube structural member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116552738A (en) * | 2023-07-04 | 2023-08-08 | 东莞市聚力复合材料科技有限公司 | Sail control rod and manufacturing process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116552738A (en) * | 2023-07-04 | 2023-08-08 | 东莞市聚力复合材料科技有限公司 | Sail control rod and manufacturing process thereof |
| CN116552738B (en) * | 2023-07-04 | 2023-11-14 | 东莞市聚力复合材料科技有限公司 | Sail control rod and manufacturing process thereof |
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