CN113997606B - Prepreg forming process for special-shaped beam product - Google Patents
Prepreg forming process for special-shaped beam product Download PDFInfo
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- CN113997606B CN113997606B CN202111423397.1A CN202111423397A CN113997606B CN 113997606 B CN113997606 B CN 113997606B CN 202111423397 A CN202111423397 A CN 202111423397A CN 113997606 B CN113997606 B CN 113997606B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004804 winding Methods 0.000 claims abstract description 38
- 238000000465 moulding Methods 0.000 claims abstract description 35
- 238000013007 heat curing Methods 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 238000001723 curing Methods 0.000 claims abstract description 10
- 229920001187 thermosetting polymer Polymers 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 13
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 230000004308 accommodation Effects 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a prepreg molding process for a special-shaped beam product, which comprises the steps of clamping and fixing a core mold by using a rotary supporting device; then forming a product foundation; then removing the core mould; reshaping the product base composite; then clamping and fixing the product basic composite part to wind the prepreg for the second time; and then thermally curing for the second time; then winding the prepreg for the third time for the third heat curing; after which the prepreg is wound a fourth time; and performing heat curing for the fourth time to form a product. The molding process provided by the invention reasonably decomposes the molding process steps of the special-shaped beam product, is very convenient to demold, does not influence the product quality after demolding, and does not lay a structural foundation for subsequent production. In addition, the prepreg winding, heat curing and demolding are effectively combined, the product quality is easier to ensure by applying the process, and the rejection rate can be greatly reduced without increasing equipment investment and mold development cost, so that the economic benefit is good.
Description
Technical Field
The invention belongs to the technical field of processing equipment of side beams of aircrafts, and particularly relates to a prepreg molding process of a special-shaped beam product.
Background
Although the prepreg autoclave process is a composite material forming processing process which is relatively commonly used at present, in the prior art, aiming at a special-shaped long beam member with complex structural dimensions, a product is generally wound on a mandrel to form the required number of layers of prepregs, and the prepregs are processed from a die by adopting an upper die, a lower die and sliding blocks on the left side and the right side, and the inner walls of the upper die, the lower die and the sliding blocks are respectively designed with profiling structures corresponding to all partial structures of the product so as to adapt to the special shape of the surface of a workpiece. However, the shaped core mold is very difficult to release. For example, a core mold made of rubber or foam materials can be demolded in a mode of destroying the core mold, but the operation is complicated, time and labor are wasted, the surface of a product is easy to damage during demolding, the surface of the destroyed core mold is rough due to the limited surface of the destroyed core mold, and the structural strength is difficult to meet the requirement of product molding sometimes, so that the product quality is influenced. Particularly, the product molding quality is difficult to ensure for the workpiece with high requirements on the surface quality of the side wall of the inner cavity, and the metal core mold is adopted, so that the product thermosetting molding quality is good, but the demolding is more difficult after the product thermosetting molding.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides a prepreg molding process for a special-shaped beam product.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a prepreg molding process for a special-shaped beam product comprises the following steps:
s0, clamping and fixing the core mold;
two ends of a base plate are respectively provided with a set of rotary supporting devices;
fixing two ends of the core mould by rotary supporting devices at corresponding sides respectively;
s1, forming a product foundation;
paving basic prepreg on the core mold, and continuously winding the prepreg from one end of the core mold to the other end by rotating the core mold when paving the basic prepreg;
then, performing thermosetting molding to form a product foundation;
s2, removing the core mold;
respectively scribing horizontal cutting lines on two side wall parts of the product foundation;
cutting the two side walls of the product foundation along the horizontal direction respectively, and taking out the core mould;
s3, molding a product basic composite part;
after demolding the core mold, buckling the upper product base flap and the lower product base flap according to the state before cutting, and winding adhesive tapes at intervals for fixing;
bonding joints of the upper petals of the product foundation and the lower petals of the product foundation by using the impregnated fiber strips at the positions where the adhesive tape is not wound;
s4, clamping and fixing the product foundation composite piece;
clamping and fixing the product foundation composite part on two rotary supporting devices;
s5, winding the prepreg for the second time;
winding the prepreg on the product foundation composite part to an embedded part embedded layer, and realizing prepreg winding by rotating the product foundation composite part when the prepreg is paved;
s6, performing heat curing for the second time;
thermosetting and forming the workpiece after the prepreg is wound for the second time, and polishing the surface of the workpiece after the thermosetting and forming;
s7, winding the prepreg for the third time;
winding prepreg along one end of the workpiece subjected to the second heat curing molding to the other end of the workpiece, and installing an embedded part at a preset position until the prepreg is wound on the pre-reinforcing layer;
s8, performing heat curing for the third time;
thermosetting and forming the workpiece wound with the prepreg for the third time;
s9, winding the prepreg for the fourth time;
winding prepreg along one end of the workpiece formed by the third heat curing until the prepreg is wound to the number of layers designed by the product;
s10, performing heat curing for the fourth time;
and (3) thermally curing the workpiece wound with the prepreg for the fourth time to form a product.
Further, the rotary supporting device comprises a support, and a top seat is arranged on the support; the footstock includes the dead axle of top portion and top portion one side, and the support is including installing in the supporting shoe of base plate and installing in the briquetting of supporting shoe, is equipped with dead axle accommodation space between briquetting and supporting shoe.
Further, the horizontal cutting lines on two sides of the product foundation are symmetrically arranged.
Further, the surface of the work piece after the third thermosetting molding in step S8 is polished.
Further, when the prepregs are laid, the overlapping positions of the adjacent two layers of prepregs are staggered.
Further, the molded product included 13 sets of prepreg units, each prepreg unit including 13 layers of prepregs, wherein the lay-up directions of the respective layers of prepregs were 45 °, 0 °, 45 °, 0 °, 90 °, 0 °, respectively.
Further, the basic prepreg comprises 1-3 groups of prepreg units, and 2-4 groups of prepreg units are arranged between the embedded part embedded layer and the product foundation.
Compared with the prior art, the invention has the following advantages:
the molding process provided by the invention reasonably decomposes the molding process steps of the special-shaped beam product, is very convenient to demold, does not influence the product quality after demolding, and does not lay a structural foundation for subsequent production. In addition, the prepreg winding, heat curing and demolding are effectively combined, the product quality is easier to ensure by applying the process, and the rejection rate can be greatly reduced without increasing equipment investment and mold development cost, so that the economic benefit is good.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic illustration of the operation of the mandrel in laying prepreg in accordance with the present invention;
FIG. 2 is a schematic illustration of FIG. 1 with the mandrel removed;
FIG. 3 is a schematic representation of the operation of applying a prepreg on a product basis in accordance with the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the invention, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
A prepreg molding process for a special-shaped beam product comprises the following steps:
s0, clamping and fixing the core mould, as shown in figures 1 and 3,
a set of rotary supporting devices 2 are respectively arranged at two ends of a base plate 1;
fixing two ends of the core mold 3 by rotary supporting devices at corresponding sides respectively;
s1, forming a product foundation;
paving basic prepreg on the core mold, and continuously winding the prepreg from one end of the core mold to the other end by rotating the core mold when paving the basic prepreg;
then the product foundation is sent into an autoclave for thermosetting molding, so as to form the product foundation; in this step, the heat curing temperature was 130 degrees celsius, and the pressure was 0.6MPa for 3 hours.
S2, removing the core mold;
respectively scribing horizontal cutting lines on two side wall parts of the product foundation;
cutting the two side walls of the product foundation along the horizontal direction respectively, and taking out the core mould;
s3, molding a product basic composite part;
after demolding the core mold, buckling the upper product base flap and the lower product base flap according to the state before cutting, and winding adhesive tapes at intervals for fixing;
bonding joints of the upper petals of the product foundation and the lower petals of the product foundation by using the impregnated fiber strips at the positions where the adhesive tape is not wound;
s4, clamping and fixing the product foundation composite piece;
clamping and fixing the product foundation composite part on two rotary supporting devices;
s5, winding the prepreg for the second time;
winding the prepreg on the product foundation composite part to an embedded part embedded layer, and realizing prepreg winding by rotating the product foundation composite part when the prepreg is paved;
s6, performing heat curing for the second time;
thermosetting and forming the workpiece after the prepreg is wound for the second time, and polishing the surface of the workpiece after the thermosetting and forming; in this step, the heat curing temperature is 130 degrees celsius, pressurized to 0.3MPa, for 3 hours;
s7, winding the prepreg for the third time;
winding prepreg along one end of the workpiece subjected to the second heat curing molding to the other end of the workpiece, and installing an embedded part at a preset position, wherein the embedded part is wound and fixed by the prepreg, and a connecting hole site is exposed until the embedded part is wound to a pre-reinforcing layer;
s8, performing heat curing for the third time;
the work piece of the third winding prepreg was heat-cured to be molded, and in this step, the heat curing temperature was 80 degrees celsius, and the pressure was 0.3MPa for 1 hour. In general, the surface of the workpiece (i.e., the surface of the embedded layer) after the third thermosetting molding is polished, so as to improve the compactness of the prepreg wound later and lay a foundation for final molding of high-quality products.
S9, winding the prepreg for the fourth time;
winding prepreg along one end of the workpiece formed by the third heat curing until the prepreg is wound to the number of layers designed by the product;
s10, performing heat curing for the fourth time;
the prepreg-wound work piece of the fourth time was heat-cured to form a product, and in this step, the heat-curing temperature was 130 degrees celsius, and the pressure was 0.6MPa for 3 hours.
It should be pointed out that the invention carries out special design aiming at heat curing parameters, because the obtained product foundation is a hollow structure after the core mold is removed, the number of layers of the prepreg is small, the structural strength is weak, and the compression resistance does not reach the performance which can be achieved by the whole design of the product, therefore, the heat curing pressure for the second time and the third time is low, so that the product foundation is prevented from being crushed.
The third heat curing is used as a fourth preparation foundation, and corresponds to the pre-curing of the external structure of the embedded layer of the product, so that the fourth winding prepreg and the third winding prepreg and the second winding prepreg can be better cured and formed into an integral structure. In the fourth heat curing process, the duration is prolonged due to the increase of temperature and pressure, at this time, the product foundation part does not collapse inwards, but has a tendency of expanding outwards under the pressure in the cavity, so that the curing and molding of the thinner product foundation and the second winding prepreg can be effectively ensured, and the molding quality is high.
It should be noted that the second curing pressure is selected to be low, which just lays a foundation for the formation of the second winding prepreg and the product base prepreg in the fourth curing (i.e., the final curing stage) better. In the invention, the second and third curing molding play a role in linking after the starting, the product molding is decomposed into four curing molding, and the molding effect of achieving the optimal product quality is achieved by each time of heat curing process parameters.
The rotary supporting device comprises a support 4, and a top seat 5 is arranged on the support; the footstock includes roof portion 6 and roof portion one side's dead axle 7, and the support is including installing in the supporting shoe 8 of base plate and installing in the briquetting 9 of supporting shoe, is equipped with dead axle accommodation space between briquetting and supporting shoe. After the pressing block is fixed on the supporting block through the connecting piece such as the screw, the end shaft can be pressed, the top seat is fixed, and then the clamping and fixing of the workpiece (or the core die) between the two top seats are realized. The accommodation space is generally the mounting hole that the semicircle groove of briquetting lower extreme constitutes with the semicircle groove of supporting shoe upper end, and the dead axle cartridge is in this mounting hole, and when needs, the dead axle can be in the mounting hole internal rotation, and then realizes the rotation of dabber or work piece, can conveniently high-efficient winding prepreg.
In order to adapt to the process, the footstock of the clamping unit can be designed to be of a ventilation structure, specifically, a central hole 10 is formed in the center of a fixing part of the footstock, a through hole 11 communicated with the central hole is formed in a jacking part, so that the pressure difference between the inner surface and the outer surface of a product can be effectively ensured to be consistent, and when prepreg is paved on the basis of the product for secondary solidification, the yield of the product can be effectively improved, and the problems of compression deformation or collapse and the like of hollow side beam workpieces are avoided.
When the prepregs are laid, the lap joint positions of two adjacent layers of prepregs are staggered. Typically, the horizontal cut lines on both sides of the product base are symmetrically arranged. In another alternative embodiment, the horizontal cutting lines on two sides of the product foundation are designed to be in a high-low mode, so that the cut upper petals of the product foundation and the cut lower petals of the product foundation are of an asymmetric structure, and the staggered cutting seams and the mutual staggering among the layers of prepregs during the subsequent prepreg paving are more facilitated.
As an example, the molded product includes 13 sets of prepreg units, each prepreg unit including 13 layers of prepregs, wherein the lay-up directions of the respective layers of prepregs are 45 °, 0 °, 45 °, 0 °, 90 °, respectively. Typically, the base prepreg comprises 1-3 sets of prepreg units, and 2-4 sets of prepreg units are included between the embedment layer and the product base.
The molding process provided by the invention reasonably decomposes the molding process steps of the special-shaped beam product, is very convenient to demold, does not influence the product quality after demolding, and does not lay a structural foundation for subsequent production. The surface quality of the side wall of the inner cavity is required to be high, such as a large and long workpiece with a special-shaped structure, such as an engine air inlet channel of an aircraft, and the product forming quality is easy to ensure. In addition, the prepreg winding, heat curing and demolding are effectively combined, the product quality is easier to ensure by applying the process, and the rejection rate can be greatly reduced without increasing equipment investment and mold development cost, so that the economic benefit is good.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A prepreg molding process for a special-shaped beam product is characterized in that,
the method comprises the following steps:
s0, clamping and fixing the core mold;
two ends of a base plate are respectively provided with a set of rotary supporting devices;
fixing two ends of the core mould by rotary supporting devices at corresponding sides respectively;
s1, forming a product foundation;
paving basic prepreg on the core mold, and continuously winding the prepreg from one end of the core mold to the other end by rotating the core mold when paving the basic prepreg;
then, performing thermosetting molding to form a product foundation;
s2, removing the core mold;
respectively scribing horizontal cutting lines on two side wall parts of the product foundation;
cutting the two side walls of the product foundation along the horizontal direction respectively, and taking out the core mould;
s3, molding a product basic composite part;
after demolding the core mold, buckling the upper product base flap and the lower product base flap according to the state before cutting, and winding adhesive tapes at intervals for fixing;
bonding joints of the upper petals of the product foundation and the lower petals of the product foundation by using the impregnated fiber strips at the positions where the adhesive tape is not wound;
s4, clamping and fixing the product foundation composite piece;
clamping and fixing the product foundation composite part on two rotary supporting devices;
s5, winding the prepreg for the second time;
winding the prepreg on the product foundation composite part to an embedded part embedded layer, and realizing prepreg winding by rotating the product foundation composite part when the prepreg is paved;
s6, performing heat curing for the second time;
thermosetting and forming the workpiece after the prepreg is wound for the second time, and polishing the surface of the workpiece after the thermosetting and forming;
s7, winding the prepreg for the third time;
winding prepreg along one end of the workpiece subjected to the second heat curing molding to the other end of the workpiece, and installing an embedded part at a preset position until the prepreg is wound on the pre-reinforcing layer;
s8, performing heat curing for the third time;
thermosetting and forming the workpiece wound with the prepreg for the third time;
s9, winding the prepreg for the fourth time;
winding prepreg along one end of the workpiece formed by the third heat curing until the prepreg is wound to the number of layers designed by the product;
s10, performing heat curing for the fourth time;
and (3) thermally curing the workpiece wound with the prepreg for the fourth time to form a product.
2. A process for prepreg forming a profiled beam product according to claim 1, wherein: the rotary supporting device comprises a support, and a top seat is arranged on the support; the footstock includes the dead axle of top portion and top portion one side, and the support is including installing in the supporting shoe of base plate and installing in the briquetting of supporting shoe, is equipped with dead axle accommodation space between briquetting and supporting shoe.
3. A process for prepreg forming a profiled beam product according to claim 1, wherein: the horizontal cutting lines on two sides of the product foundation are symmetrically arranged.
4. A process for prepreg forming a profiled beam product according to claim 1, wherein: and (3) polishing the surface of the workpiece after the third heat curing molding in the step S8.
5. A process for prepreg forming a profiled beam product according to claim 1, wherein: when the prepregs are laid, the lap joint positions of two adjacent layers of prepregs are staggered.
6. A process for prepreg forming a profiled beam product according to claim 1, wherein: the molded product included 13 sets of prepreg units, each prepreg unit including 13 layers of prepregs, wherein the lay-up directions of the respective layers of prepregs were 45 °, 0 °, 45 °, 0 °, 90 °, 0 °, respectively.
7. The process for forming the prepreg for the profiled beam product according to claim 6, wherein: the basic prepreg comprises 1-3 groups of prepreg units, and 2-4 groups of prepreg units are arranged between the embedded part embedded layer and the product foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423397.1A CN113997606B (en) | 2021-11-26 | 2021-11-26 | Prepreg forming process for special-shaped beam product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423397.1A CN113997606B (en) | 2021-11-26 | 2021-11-26 | Prepreg forming process for special-shaped beam product |
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| Publication Number | Publication Date |
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| CN113997606A CN113997606A (en) | 2022-02-01 |
| CN113997606B true CN113997606B (en) | 2024-02-20 |
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| CN202111423397.1A Active CN113997606B (en) | 2021-11-26 | 2021-11-26 | Prepreg forming process for special-shaped beam product |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05269868A (en) * | 1992-03-25 | 1993-10-19 | Sumitomo Metal Ind Ltd | Production of perforated hollow composite material |
| JP2006327562A (en) * | 2005-05-24 | 2006-12-07 | Tokiwa Chemical Industry Co Ltd | Method for manufacturing synthtic resin core material |
| CN206589365U (en) * | 2017-04-01 | 2017-10-27 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of composite hat stringer is preforming and its core of Material Stiffened Panel solidification |
| CN107901447A (en) * | 2017-09-28 | 2018-04-13 | 刘长喜 | Prepreg tape preheats molding carbon fibre composite revolving meber winding process |
| CN108162430A (en) * | 2017-12-06 | 2018-06-15 | 航天材料及工艺研究所 | A kind of abnormity composite material grid covering bay section forming method |
| CN109910208A (en) * | 2019-04-23 | 2019-06-21 | 哈尔滨工业大学 | A kind of core model and preparation method thereof and composite material shape tube forming method |
-
2021
- 2021-11-26 CN CN202111423397.1A patent/CN113997606B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05269868A (en) * | 1992-03-25 | 1993-10-19 | Sumitomo Metal Ind Ltd | Production of perforated hollow composite material |
| JP2006327562A (en) * | 2005-05-24 | 2006-12-07 | Tokiwa Chemical Industry Co Ltd | Method for manufacturing synthtic resin core material |
| CN206589365U (en) * | 2017-04-01 | 2017-10-27 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of composite hat stringer is preforming and its core of Material Stiffened Panel solidification |
| CN107901447A (en) * | 2017-09-28 | 2018-04-13 | 刘长喜 | Prepreg tape preheats molding carbon fibre composite revolving meber winding process |
| CN108162430A (en) * | 2017-12-06 | 2018-06-15 | 航天材料及工艺研究所 | A kind of abnormity composite material grid covering bay section forming method |
| CN109910208A (en) * | 2019-04-23 | 2019-06-21 | 哈尔滨工业大学 | A kind of core model and preparation method thereof and composite material shape tube forming method |
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| CN113997606A (en) | 2022-02-01 |
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