CN115972614A - Prestress pressing process for wide plate - Google Patents
Prestress pressing process for wide plate Download PDFInfo
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- CN115972614A CN115972614A CN202211356841.7A CN202211356841A CN115972614A CN 115972614 A CN115972614 A CN 115972614A CN 202211356841 A CN202211356841 A CN 202211356841A CN 115972614 A CN115972614 A CN 115972614A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000003825 pressing Methods 0.000 title claims abstract description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 71
- 239000004917 carbon fiber Substances 0.000 claims abstract description 71
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000004744 fabric Substances 0.000 claims abstract description 48
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000004043 dyeing Methods 0.000 claims abstract description 9
- 238000007731 hot pressing Methods 0.000 claims abstract description 9
- 238000009941 weaving Methods 0.000 claims abstract description 7
- 239000000805 composite resin Substances 0.000 claims description 8
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000012943 hotmelt Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 3
- CMLFRMDBDNHMRA-UHFFFAOYSA-N 2h-1,2-benzoxazine Chemical compound C1=CC=C2C=CNOC2=C1 CMLFRMDBDNHMRA-UHFFFAOYSA-N 0.000 claims description 3
- 125000000304 alkynyl group Chemical group 0.000 claims description 3
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 3
- 239000002759 woven fabric Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000009998 heat setting Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 13
- 239000011159 matrix material Substances 0.000 abstract description 6
- 230000008646 thermal stress Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000003763 carbonization Methods 0.000 abstract description 4
- 238000005087 graphitization Methods 0.000 abstract description 4
- 230000035882 stress Effects 0.000 abstract description 4
- 230000037303 wrinkles Effects 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 17
- 238000004804 winding Methods 0.000 description 5
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 4
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 239000012467 final product Substances 0.000 description 1
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- 239000003292 glue Substances 0.000 description 1
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Images
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
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Reinforced Plastic Materials (AREA)
- Woven Fabrics (AREA)
Abstract
The invention discloses a prestress pressing process for a wide plate, and relates to the technical field of processing of carbon fiber reinforced resin matrix composite plates. The process comprises the following steps: weaving carbon fiber yarns into cloth in the weft direction and the radial direction, reserving allowance in the weft direction, and carrying out a hot melting dip dyeing process to form prepreg cloth; then, a pre-tension is given through a holding and pulling device, and finally hot-pressing cooling forming is carried out. The invention avoids the internal stress between cloth cover layers caused by the expansion and the flow of resin in the traditional temperature rise process of the mould pressing process; the thermal stress deformation of the product is reduced, and the phenomena of wrinkles, wave deformation and warping are reduced; the large tow yarn is adopted, so that the cost can be reduced; after the plate is cooled and shaped, the product has good diagonal flatness, good uniformity and flatness, less high-temperature deformation coefficient during subsequent carbonization and graphitization, and improved material modulus, and is beneficial to the subsequent process of the product to use the plate for structural design.
Description
Technical Field
The invention belongs to the technical field of processing of carbon fiber reinforced resin matrix composite plates, and particularly relates to a prestress pressing process for a wide plate of a carbon fiber reinforced resin matrix composite.
Background
The carbon fiber is a material with the advantages of light weight, high strength, corrosion resistance, fatigue resistance, high temperature resistance and the like, and is often combined with various resin matrixes in practical application to form carbon fiber composite materials suitable for different application fields, wherein the high temperature resistance and the fire resistance of the formed carbon fiber composite materials are main reasons for the wide application of the carbon fiber composite materials in the scenes such as aerospace, civil engineering and the like; the use of different resin matrices can determine the differences in their properties. For example, the aerospace industry often chooses phenolic resins with self-extinguishing properties; common epoxy resin modified by adding a large amount of fire-resistant filler is commonly adopted in the field of civil engineering.
The most common way for combining carbon fibers with a resin matrix is to manufacture a carbon fiber resin composite material plate which is widely applied to the industries of photovoltaics, semiconductors, energy sources and the like; because the carbon fiber resin composite material plate is made of the carbon fiber material, when the prepared carbon fiber resin composite material plate is thin in thickness and large in size, the plate product is easy to deform in a high-temperature and high-pressure pressing process, the flatness condition is poor, and the phenomena of folding, wave deformation, warping and the like are easy to occur, so that the finally made plate is low in structural strength and serious in deformation condition.
Disclosure of Invention
The invention provides a prestress pressing process for a wide plate, which solves the problems.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a prestress pressing process for a wide plate, which comprises the following steps of:
s1, weaving carbon cloth: in the weft direction, carbon fiber yarns with small K number and tensile strength larger than T700 are adopted, and the small K number is 1K-6K; the carbon fiber yarn with large K number is adopted in the radial direction, and the large K number is more than or equal to 12K; woven by weft carbon fiber yarns and radial carbon fiber yarns, the thickness of the weft carbon fiber yarns and the radial carbon fiber yarns is 0.1-0.8mm, and the surface density of the weft carbon fiber yarns and the radial carbon fiber yarns is 200g/m 2 -360g/m 2 The woven cloth is plain, twill and satin; meanwhile, when the woven fabric is subjected to edge folding in the weft directionLeaving the allowance of weft carbon fiber yarns;
s2, hot-melt dip dyeing: the carbon woven cloth is processed by a dipping process to form carbon fiber woven prepreg cloth, and then the carbon fiber woven prepreg cloth is shaped by a heat-setting oven and is coiled; the carbon fiber woven prepreg is obtained by putting the woven cloth into any one of epoxy resin, phenolic resin, unsaturated resin, polyurethane resin, bismaleimide resin, alkynyl resin and benzoxazine resin for dip dyeing and coating the prepreg on the surface of the woven cloth;
s3, cross layering: on the surface of a flat plate die, alternately and rotatably layering carbon fiber woven prepreg according to the directions of 0 degrees and 90 degrees, wherein a first allowance is reserved for weft-wise carbon fiber yarns in the direction of 0 degrees of the carbon fiber woven prepreg, a second allowance is reserved for weft-wise carbon fiber yarns in the direction of 90 degrees, and two layers of woven prepreg in the directions of 0 degrees and 90 degrees form a group;
s4, drawing and stretching: respectively setting pretension at a first allowance position and a second allowance position of a group of cross and flat woven prepreg cloth through a holding and drawing device, and releasing tension after maintaining the tension for a period of time; performing the same operation on other groups of woven prepreg cloth in the manner, then stacking the woven prepreg cloth layer by layer until the required process thickness is achieved, and setting pretension on the integrally woven prepreg cloth with the process thickness at a first allowance position and a second allowance position respectively through a holding and drawing device to keep the plate surface flat;
s5, hot-pressing, cooling and forming: adjusting according to the specification and size of the product, carrying out integral hot-press shaping on the drawn and stretched woven pre-impregnated cloth, and keeping the pressure, cooling to room temperature to obtain the wide carbon fiber resin composite material plate.
Further, the length of the first allowance and the second allowance is 5-10cm.
Further, the clamping and pulling device clamps and pulls the first allowance and the second allowance by adopting a wide clamp of 0.1-0.6 m; the wide clamp is composed of an upper plate and a lower plate which are connected by a pin structure, the first allowance or the second allowance is positioned between the upper plate and the lower plate, and the pin structure is used for limiting and fixing so as to realize clamping and drawing; the tail end of the holding and drawing device is connected with a tension controllable traction device.
Compared with the prior art, the invention has the following beneficial effects:
(1) The weft yarns with high strength are adopted, so that the product has enough traction strength, and the wide cloth cover is ensured to be smooth; the weft carbon fibers with large K number (K is more than or equal to 12) are adopted, so that the weaving intersections of the carbon fibers are reduced, the distance between the moments of the intersections of the weft carbon fibers is increased, and the in-plane stress of the material is reduced;
(2) In the hot-pressing cooling molding solidification process, the holding and drawing device of the technical scheme can give prestress, so that the problem of uneven thermal stress in the product pressing process is solved, the thermal stress deformation of the product is reduced, and the phenomena of wrinkles, wave deformation and warping are reduced;
(3) The woven cloth can adopt large-tow yarns, so that the cost can be reduced, the structure has a gap and the glue content is low, and if the plate manufactured by the method needs to be further processed, for example, when the plate needs to be densified by a vapor deposition process, more air flow channels can be formed, so that the gas carbon deposition is facilitated, the performance of the whole carbon-carbon composite material is improved, and the effect of converting the performance of the whole carbon-carbon composite material into the advantages is achieved;
(4) After cooling and shaping, the product has good diagonal flatness, good uniformity and flatness, less high-temperature deformation coefficient when performing carbonization and graphitization subsequently, and improved material modulus, and is beneficial to the subsequent process of the product to use the plate for structural design.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a finished wide sheet material manufactured by the pre-stressing press process of the present invention;
FIG. 2 is an enlarged view of a portion of the portion A of FIG. 1;
FIG. 3 is a schematic view of a woven prepreg fabric construction;
FIG. 4 is a schematic view of a scene in which the method performs cross laying on the woven prepreg cloth and clamping by using a clamping and pulling device;
FIG. 5 is a partial schematic view of a set of woven cloths being cross-plied using a clamping and pulling device;
FIG. 6 is a schematic diagram of a pulling mechanism connected to the rear of the tension device in accordance with an embodiment;
FIG. 7 is a side view of a wide format clip constructed with upper and lower plates and a pin configuration according to an exemplary embodiment;
fig. 8 is a schematic diagram of the steps of the prestressing pressing process for wide boards according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "latitudinal," "longitudinal," "lateral," "up-down," and the like, indicate positional or positional relationships, are used merely to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The technical scheme provides a process for preparing a wide carbon fiber reinforced resin matrix composite plate in order to solve the problems that the existing carbon fiber resin matrix composite plate, especially a large-size and thin-thickness plate product, is easy to deform, has poor flatness, and is easy to generate wrinkles, wave deformation, warping and the like after being pressed at high temperature and high pressure under the conditions that the length exceeds 2m, the width exceeds 1m and the thickness is less than 10 mm.
Referring to fig. 1-8, a pre-stress pressing process for a wide plate according to the present invention includes the following steps:
s1, weaving into cloth: the weft direction adopts the carbon fiber yarn with small K number (1K-6K) and tensile strength larger than T700; the carbon fiber yarns with large K number (more than or equal to 12K) are adopted in the radial direction, the low cost requirement is considered, and the tensile strength can be lower than that of T700 carbon fibers; woven by weft carbon fiber yarns and radial carbon fiber yarns, the thickness of the weft carbon fiber yarns and the radial carbon fiber yarns is 0.1-0.8mm, and the surface density of the weft carbon fiber yarns and the radial carbon fiber yarns is 200g/m 2 -360g/m 2 Meanwhile, when the weft direction of the woven fabric is subjected to edge folding, the weft direction carbon fiber yarn allowance is reserved;
s2, hot-melt dip dyeing: the carbon woven cloth is processed by a gum dipping process to form carbon fiber woven prepreg cloth, and the mass ratio of the resin to the woven cloth is 15-35%; in this embodiment, weft carbon fiber yarns with a specification of 3K and a strength of T700 and radial carbon fiber yarns with a specification of 24K and a strength of T300 are specifically used, and the thickness of the woven cloth is 0.5mm, and the areal density of the woven cloth is 320g/m 2 The woven cloth is in a plain weave structure, the 0-degree direction and the 90-degree direction are respectively a first allowance and a second allowance, and the lengths of the allowances are both 5cm; the prepreg cloth is prepared by putting woven cloth into any one of epoxy resin, phenolic resin, unsaturated resin, polyurethane resin, bismaleimide resin, alkynyl resin and benzoxazine resin for dip-dyeing, wherein the dip-dyeing time is less than 10min, the specific embodiment selects carbon fiber woven cloth for hot-melt dip-dyeing in phenolic resin, the mass ratio of the resin to the woven cloth is 20%, the viscosity of film forming resin is 8-80pa.s, the gel time of the phenolic resin is more than 4h, the film forming temperature is 60 +/-5 ℃, an adhesive film is formed after the film is formed on the surface of a PE film, the adhesive film is then impregnated with the woven cloth, the impregnation temperature is 70-80 ℃, and then the woven cloth is vertically covered with a release film for curling and storing;
s3, cross layering: on the surface of a flat plate die, tearing off a release film from a carbon fiber woven prepreg, and then alternately rotating and layering according to 0-degree and 90-degree directions, wherein the latitudinal margin in the 0-degree direction is a first margin position, and rotating to the latitudinal margin in the 90-degree direction is a second margin position, and two layers of woven prepregs in the 0-degree direction and the 90-degree direction form a group;
s4, drawing and stretching: placing the woven prepreg cloth which is cross-laid and placed layer by layer at a first allowance position and a second allowance position, respectively setting a pre-tension through a holding and drawing device, and controlling the tension to be 3-50N; a group of crossed and tiled woven prepreg cloth is positioned at a first allowance position and a second allowance position, pretension is given through a holding and drawing device respectively, the tension range is 1-10N, and the tension is removed after 5-30 s of tension is kept; carrying out the same operation on the woven prepreg of other groups in the manner, then stacking the woven prepreg layer by layer until the required process thickness is reached, and setting the pretension of the integrally woven prepreg reaching the process thickness at a first allowance position and a second allowance position respectively through a holding and drawing device, wherein the tension is controlled to be 3-50N so as to keep the plate surface flat; in the specific embodiment, 3N of tension is applied to the single-group woven prepreg, the tension is removed after the tension is kept for 20s, and the pretension applied to the whole woven prepreg is 30N;
as shown in fig. 6-7, the clamping and pulling device adopts a wide-width clamp, the wide-width clamp is composed of an upper plate and a lower plate which are connected by a pin structure, the thickness of a single plate of the clamp is 3-7 mm, the width range of the clamp is 0.1-0.6m, the depth range of the clamp is 20-100 mm, the diameter of the pin is 6-8 mm, the single plate is distributed at intervals of 30-100 mm along the width direction of the clamp, and the interval is 10-20 mm along the depth direction; the specific embodiment specifically adopts a wide-width clamp with the width of 0.3m and the depth of 40mm, the diameter of each pin is 8mm, 3 groups of the wide-width clamp are arranged along the width direction of the clamp, each group comprises two pins, and a first allowance or a second allowance is positioned between an upper plate and a lower plate and is limited and fixed by a pin structure so as to realize clamping and traction; the tail end of the holding and drawing device is connected with a tension controllable traction device; the upper plate and the lower plate are connected through a perforated splicing pin, a first allowance or a second allowance between the upper plate and the lower plate is pressed downwards and fixed after a bolt penetrates through a connecting hole at the end part of the pin, the woven prepreg cloth is clamped and fixed, a connecting ring is arranged at the rear ends of the upper plate and the lower plate through a perforation, the connecting ring is connected with a winding core of a tension control system in a winding mode through a connecting belt, a clamping and drawing device on one side of the woven prepreg cloth is respectively connected with a single clamping and drawing device in a winding mode, a magnetic powder controller driven by a motor is arranged on the winding core and connected with the tension controller, the tension of the corresponding winding core on the first allowance or the second allowance is controlled through the tension controller, and accordingly the wide cloth cover is guaranteed to be leveled.
S5, hot-pressing, cooling and forming: adjusting according to the specification and size of a product, carrying out integral hot-press shaping on stacked cloth formed by woven cloth after traction and stretching, and keeping pressure and cooling to room temperature to obtain a wide carbon fiber resin composite material plate; the hot pressing maximum temperature is 180-220 ℃, the hot pressing temperature rise time is 1-4h, the pressure is maintained for 2-5h, and the pressure is 1-10MPa. In the embodiment, the hot pressing temperature is 200 ℃, the hot pressing temperature rise time is 2 hours, the pressure is maintained for 3 hours, and the pressure is 5MPa.
The manufacturing size of the wide carbon fiber resin composite material plate is 2.4mx 1.3mx 5mm; the plate in the specific embodiment is used for a structural frame of a high-temperature furnace body, and because the use condition belongs to a high-temperature environment, the resin-based composite material needs to be manufactured firstly, and then high-temperature carbonization and graphitization processes are performed; the final product is used for supporting and placing high-temperature treatment objects and can be used in the industries of photovoltaics, semiconductors, energy sources and the like.
Specifically, the method comprises the following steps:
the method is characterized in that a holding device is not adopted, a common pre-dipping and flat-laying process is directly adopted, and the obtained wide-width plate has the following mechanical properties: the tensile strength is 160-200Mpa, the bending strength is 100-140Map, and the diagonal offset is 2-3mm;
by adopting the clamping device and the self-made carbon fiber cloth in the technical scheme, the clamping force is controlled to be 30-120N through staggered layering layer by layer, and the mechanical properties of the obtained wide-width plate are as follows: the tensile strength is 200-265Mpa, the bending strength is 140-170Mpa, and the diagonal offset is 1.5-2mm.
In conclusion, the technical scheme adopts the high-strength weft yarns, so that the product has enough traction strength, and the wide cloth cover is ensured to be smooth; the weft carbon fibers with large K number (K is more than or equal to 12) are adopted, so that the weaving cross points of the carbon fibers are reduced, the distance between the moment of the cross points of the weft carbon fibers is increased, and the in-plane stress of the material is reduced; the holding and drawing device of the technical scheme can apply prestress, reduce the problem of uneven thermal stress in the product pressing process, reduce the thermal stress deformation of the product, and reduce the phenomena of wrinkles, wave deformation and warping; the technical scheme can also adopt large-tow yarns, so that the cost can be reduced, the structure is provided with gaps, the gel content is low, and if the plate manufactured by the carbon fiber composite material needs to be further processed, for example, when the plate needs to be densified by a vapor deposition process, more airflow channels are provided, so that the carbon deposition of gas is facilitated, the performance of the whole carbon-carbon composite material is improved, and the effect of converting the performance of the carbon-carbon composite material into the advantages is achieved. After the product is cooled and shaped, the product has good diagonal flatness, good uniformity and flatness, less high-temperature deformation coefficient of the product during subsequent carbonization and graphitization, and improved material modulus, and is beneficial to the subsequent process of the product to use the plate for structural design.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. The prestress pressing process of the wide plate is characterized by comprising the following steps of:
s1, weaving carbon cloth: in the weft direction, carbon fiber yarns with small K number and tensile strength larger than T700 are adopted, and the small K number is 1K-6K; the carbon fiber yarn with large K number is adopted in the radial direction, and the large K number is more than or equal to 12K; woven by weft carbon fiber yarns and radial carbon fiber yarns, the thickness of the woven carbon fiber yarns is 0.1-0.8mm, and the surface density of the woven carbon fiber yarns is 200g/m 2 -360g/m 2 The weaving cloth of (2) is plain, twill and satin; meanwhile, when the weft direction of the woven fabric is subjected to edge folding, the weft direction carbon fiber yarn allowance is reserved;
s2, hot-melt dip dyeing: forming carbon fiber woven prepreg cloth by a gum dipping process, and then forming into coils by a heat setting oven; the carbon fiber woven prepreg is obtained by putting the woven cloth into any one of epoxy resin, phenolic resin, unsaturated resin, polyurethane resin, bismaleimide resin, alkynyl resin and benzoxazine resin for dip-dyeing and coating the prepreg on the surface of the woven cloth;
s3, cross layering: on the surface of a flat plate die, alternately and rotatably layering carbon fiber woven prepreg according to the directions of 0 degrees and 90 degrees, wherein a first allowance is reserved for weft-wise carbon fiber yarns in the direction of 0 degrees of the carbon fiber woven prepreg, a second allowance is reserved for weft-wise carbon fiber yarns in the direction of 90 degrees, and two layers of woven prepreg in the directions of 0 degrees and 90 degrees form a group;
s4, drawing and stretching: respectively setting pretension at a first allowance position and a second allowance position of a group of cross and flat woven prepreg cloth through a holding and drawing device, and releasing tension after maintaining the tension for a period of time; carrying out the same operation on the woven prepreg of other groups in the manner, then stacking the woven prepreg layer by layer until the required process thickness is reached, and respectively setting the pretension of the integrally woven prepreg reaching the process thickness at the first allowance position and the second allowance position through a holding and drawing device so as to keep the plate surface flat;
s5, hot-pressing, cooling and forming: adjusting according to the specification and size of the product, carrying out integral hot-press shaping on the drawn and stretched woven pre-impregnated cloth, and keeping the pressure, cooling to room temperature to obtain the wide carbon fiber resin composite material plate.
2. The pre-stress pressing process of claim 1, wherein the first and second margins have a length of 5-10cm.
3. The pre-stress pressing process of the wide-width plate according to claim 1, wherein the holding and pulling device uses a wide-width clamp of 0.1-0.6m to hold and pull the first allowance and the second allowance; the wide clamp is composed of an upper plate and a lower plate which are connected by a pin structure, the first allowance or the second allowance is positioned between the upper plate and the lower plate, and the pin structure is used for limiting and fixing so as to realize clamping and drawing; the tail end of the clamping and pulling device is connected with a traction device with controllable tension.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211356841.7A CN115972614A (en) | 2022-11-01 | 2022-11-01 | Prestress pressing process for wide plate |
| PCT/CN2023/100958 WO2024093254A1 (en) | 2022-11-01 | 2023-06-19 | Prestress pressing process for wide sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211356841.7A CN115972614A (en) | 2022-11-01 | 2022-11-01 | Prestress pressing process for wide plate |
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| CN115972614A true CN115972614A (en) | 2023-04-18 |
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| CN202211356841.7A Pending CN115972614A (en) | 2022-11-01 | 2022-11-01 | Prestress pressing process for wide plate |
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| Country | Link |
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| CN (1) | CN115972614A (en) |
| WO (1) | WO2024093254A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093254A1 (en) * | 2022-11-01 | 2024-05-10 | 上海骐杰碳素材料有限公司 | Prestress pressing process for wide sheet |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2836457B2 (en) * | 1993-10-26 | 1998-12-14 | 東レ株式会社 | Carbon fiber fabric and method and apparatus for producing the same |
| DE102008022377B4 (en) * | 2008-05-06 | 2014-02-13 | Eurocopter Deutschland Gmbh | Support strut for supporting an intermediate deck arranged in an aircraft fuselage and method for producing a rod body for such a support strut |
| CN102514206B (en) * | 2011-12-07 | 2014-02-05 | 长春工业大学 | Production method of phenol formaldehyde epoxy vinyl ester resin/carbon fiber composite material |
| CN104626669A (en) * | 2015-01-13 | 2015-05-20 | 上海杉华复合材料科技有限公司 | Carbon fiber enhanced composite material panel and preparation method thereof |
| CN106626439A (en) * | 2016-12-27 | 2017-05-10 | 长春工业大学 | Preparation method of low-cost and large-tow 48K carbon fiber preimpregnated cloth and composite material thereof |
| CN108582910A (en) * | 2018-07-11 | 2018-09-28 | 精功（绍兴）复合材料有限公司 | Carbon fiber high-temperature prepreg and laminated board thereof |
| CN112743876A (en) * | 2020-12-17 | 2021-05-04 | 江苏集萃复合材料装备研究所有限公司 | Equipment and process for preparing weaving and pultrusion integrated composite material |
| CN115972614A (en) * | 2022-11-01 | 2023-04-18 | 上海骐杰碳素材料有限公司 | Prestress pressing process for wide plate |
-
2022
- 2022-11-01 CN CN202211356841.7A patent/CN115972614A/en active Pending
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- 2023-06-19 WO PCT/CN2023/100958 patent/WO2024093254A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093254A1 (en) * | 2022-11-01 | 2024-05-10 | 上海骐杰碳素材料有限公司 | Prestress pressing process for wide sheet |
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| WO2024093254A1 (en) | 2024-05-10 |
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