CN109049753B - Preparation method of heat-resistant nose cone - Google Patents
Preparation method of heat-resistant nose cone Download PDFInfo
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- CN109049753B CN109049753B CN201810762986.4A CN201810762986A CN109049753B CN 109049753 B CN109049753 B CN 109049753B CN 201810762986 A CN201810762986 A CN 201810762986A CN 109049753 B CN109049753 B CN 109049753B
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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
- B29C70/28—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
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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
- B29C70/28—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
- B29C70/342—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 using isostatic pressure
-
- 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
-
- 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
Abstract
The invention discloses a preparation method of a heat-resistant nose cone in the technical field of aviation, which comprises the following steps of (1) blanking a fiber fabric; (2) preparing a mould; (3) paving a fiber fabric: calculating the using amount of resin according to the weight of the carbon fiber fabric, and weighing for later use; the cut carbon fiber fabric is laid on a clean and bright platform, polyimide resin is coated on the surface of the carbon fiber fabric by a brush and soaked, the carbon fiber fabric is pushed into a drying box after the coating is finished, the temperature is raised to 80 ℃, the carbon fiber fabric is dried for 1 hour, and the carbon fiber fabric is taken out for standby after the drying is finished; brushing a layer of resin on the surface of the core mold, and paving the fiber fabric on the surface of the core mold layer by layer according to a paving sequence; (4) vacuumizing; (5) closing the mold; (6) curing; (7) demolding; (8) drilling and trimming; the invention has low preparation cost.
Description
Technical Field
The invention belongs to the technical field of aviation, and particularly relates to a preparation method of a heat-resistant nose cone.
Background
Due to the excellent material performance and process characteristics of the composite material, the composite material is used for military purposes at home and abroad: main bearing structures such as airplane wings, airplane bodies and central wing boxes, and aerospace structural parts such as carrier rocket upper stages, satellite bearing cylinders, satellite battery arrays and missile shells; in the civil aspect: train shells, concrete pump truck booms, bridge construction, building reinforcement and the like are widely applied. With the rapid development of China in the military field in recent years, the application of the composite material in the military field is rapidly developed and is more and more widely applied. But the application gap in the high-end civil field is still large.
The heat-resistant nose cone is used as a nose fairing of a high-speed airplane, so that the continuity of the appearance of the airplane is ensured, the resistance is reduced, and aerodynamic reasons such as normal shock waves and the like are eliminated. The existing airplane nose cone can only bear the temperature of about 100 ℃, when the airplane reaches higher flying speed, the surface temperature of the nose cone reaches 500 ℃ due to the violent friction between the nose cone and air, and at the moment, the nose cone cannot bear the high surface temperature, so that components in the nose cone are easy to damage; in addition, the cost of preparing the nose cone is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to overcome the defects in the prior art and provide the preparation method of the heat-resistant nose cone, the preparation cost is low, and the prepared nose cone is high-temperature resistant, light in weight, fatigue resistant, good in performance stability and capable of meeting the requirement of higher flying speed.
The purpose of the invention is realized as follows: a preparation method of a heat-resistant nose cone comprises the following steps,
(1) fiber fabric blanking: drawing the appearance of each layer of fiber fabric by using three-dimensional software, guiding the appearance into an operating system of an automatic blanking machine, putting the fiber fabric on a bracket of the automatic blanking machine, cutting each material sheet according to an European program, and identifying the number by using label paper;
(2) preparation of a mold: disassembling a die, cleaning residues on the surface of each part, wiping the die parts by using clean cloth tapes to soak acetone after cleaning the residues, cleaning residues and dirt, then wiping the inner cavity of the die by using the clean cloth tapes to soak a release agent, wiping the release agent again after the release agent is dried, repeatedly wiping the release agent for 5 times, wiping the release agent again after 15 minutes of interval between every two times, and installing an aluminum mold core on a die bottom plate after wiping the last release agent, and fixing the aluminum mold core by using bolts;
(3) paving a fiber fabric: calculating the using amount of resin according to the weight of the carbon fiber fabric, and weighing for later use; the cut carbon fiber fabric is laid on a clean and bright platform, polyimide resin is coated on the surface of the carbon fiber fabric by a brush and soaked, the carbon fiber fabric is pushed into a drying box after the coating is finished, the temperature is raised to 80 ℃, the carbon fiber fabric is dried for 1 hour, and the carbon fiber fabric is taken out for standby after the drying is finished; brushing a layer of resin on the surface of the core mold, and paving the fiber fabric on the surface of the core mold layer by layer according to a paving sequence;
(4) vacuumizing: wrapping the paved core mold with a pasted vacuum bag, vacuumizing the vacuum bag at normal temperature, and compacting each layer of fiber fabric by using vacuum pressure;
(5) die assembly: after the fiber fabric is compacted, taking down the vacuum bag, respectively and correspondingly combining the two female dies on the two sides of the core die, locking the female dies on the base, and tightly pressing the fiber fabric by using the female dies;
(6) and (3) curing: placing the mold horizontally and sending the mold into an oven, and curing the mold according to a curing process;
(7) demolding: after solidification, closing the oven, taking out the mold after the temperature of the mold is reduced to be lower than 70 ℃, unloading the base, gradually drawing out the core mold, and taking down the female molds on the two sides to obtain a primary product;
(8) hole making and trimming: and (5) conveying the primary product obtained in the step (7) to a machining center for drilling, cutting off the allowance area after hole making is finished, and polishing burrs and the resin-rich area on the edge until the burrs and the resin-rich area are smooth to obtain a final product.
The preparation cost is low, and the prepared nose cone is light in weight, high-temperature resistant, high in strength and good in bending resistance, and meets the requirement of higher flying speed; can be used for preparing the airplane nose cone.
In order to further improve the curing effect, the curing process in the step (6) is characterized in that the temperature of the oven is firstly increased to 80 ℃, the oven is kept at 80 ℃ for 30min, the oven is heated to 140 ℃ after being kept at the temperature for 30min, the oven is kept at 140 ℃ for 30min, the oven is heated to 210 ℃ after being kept at the temperature for 30min, the oven is kept at 210 ℃ for 30min, the temperature of the oven is increased to 260 ℃ after being kept at the temperature for 30min, the bolt of the mold is loosened when the temperature of the oven is 260 ℃, the gas is discharged for 3min, the bolt is fastened after the gas is released, the oven is heated to 290 ℃ when the temperature of the oven is 290 ℃, the gas is discharged for 3min, the bolt is fastened after the gas is released, the oven is heated to 310 ℃, the oven is kept at 310 ℃ for 30min, the oven is heated to 340 ℃ after being kept at the temperature for 30min, is kept at 340 ℃ for 1h, the oven is heated to 370 ℃ after, and (4) heating the oven to 390 ℃, and preserving the heat at 390 ℃ for 2h to finish curing.
In order to make the fiber fabric tightly fit on the core mold, in the step (3), each layer of fiber fabric is paved, a layer of resin is brushed on the fiber fabric by using a hairbrush, and the resin is soaked in the fiber fabric until all the fiber fabrics are paved.
In order to further improve the strength and the bending resistance of the product, in the step (3), every four layers of the fiber fabric form a group of paving components, and the paving angles of the layers of each group of paving components are 45 degrees, 0 degrees, 45 degrees and 90 degrees in sequence.
In order to make each layer of fiber fabric tightly attached, in the step (3), 4 layers of fiber fabrics are attached to each layer of fiber fabric, the core mold is placed into an oven with the temperature of 80 ℃ for drying for 15min, after drying is finished, the core mold is taken out, and the fiber fabrics are continuously attached to each other.
In order to realize seamless connection of the two surfaces of the core mold, in the step (3), when the fiber fabric is applied to the core mold, specifically, the two surfaces of the core mold are respectively applied, and the joint of the two surfaces is applied with the strip-shaped patch.
In order to realize seamless connection of the two surfaces of the core mold, in the step (3), when the fiber fabrics are paved on the core mold, specifically, the two surfaces of the core mold are respectively paved, the fiber fabrics with the surface edges on one surface are turned over the connection part of the surface layer edges to be in butt joint with the layers on the other surface, and seams among different layers are staggered.
In order to facilitate the drawing of the core mold, the core mold is composed of a plurality of core modules, a plurality of connecting pins are distributed on the groove of the base, pin holes corresponding to the connecting pins are formed in the bottom of each core module, each core module is correspondingly installed in the groove of the base, and in the step (7), the core modules are drawn out one by one.
Drawings
Fig. 1 is a perspective view of a mold after clamping in the present invention.
Fig. 2 is a perspective view of the mold of the present invention after being separated.
Fig. 3 is a perspective view of the base of the present invention.
Fig. 4 is a schematic perspective view of the nose cone of the present invention.
FIG. 5 is a graph of the curing profile of the present invention.
Fig. 6 is a front view of the core mold of the present invention.
The die comprises a base 1, a female die 2, a core die 3, a connecting pin 4 and a groove 5.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A method for preparing a heat-resistant nose cone as shown in fig. 1 to 4, comprising the steps of,
(1) fiber fabric blanking: drawing the appearance of each layer of fiber fabric by using three-dimensional software, guiding the appearance into an operating system of an automatic blanking machine, putting the fiber fabric on a bracket of the automatic blanking machine, cutting each material sheet according to an European program, and identifying the number by using label paper;
(2) preparation of a mold: disassembling a die, cleaning residues on the surface of each part, wiping the die parts by using clean cloth tapes to soak acetone after cleaning the residues, cleaning residues and dirt, then wiping the inner cavity of the die by using the clean cloth tapes to soak a release agent, wiping the release agent again after the release agent is dried, repeatedly wiping the release agent for 5 times, wiping the release agent again after 15 minutes of interval between every two times, and installing an aluminum mold core on a die bottom plate after wiping the last release agent, and fixing the aluminum mold core by using bolts;
(3) paving a fiber fabric: calculating the using amount of resin according to the weight of the carbon fiber fabric, and weighing for later use; the cut carbon fiber fabric is laid on a clean and bright platform, resin is coated on the surface of the carbon fiber fabric by using a brush and soaked, the carbon fiber fabric is pushed into a drying box after the coating is finished, the temperature is raised to 80 ℃, the carbon fiber fabric is dried for 1 hour, and the carbon fiber fabric is taken out for standby after the drying is finished; brushing a layer of resin on the surface of the core mold 3, paving and pasting fiber fabrics on the surface of the core mold 3 layer by layer according to a paving sequence, specifically, paving and pasting two surfaces of the core mold 3 respectively, and paving and pasting a strip-shaped patch at the joint of the two surfaces;
(4) vacuumizing: wrapping the paved core mold 3 by the pasted vacuum bag, vacuumizing the vacuum bag at normal temperature, and compacting each layer of fiber fabric by using vacuum pressure;
(5) die assembly: after the fiber fabric is compacted, taking down the vacuum bag, correspondingly closing the two female dies 2 on two sides of the core die 3 respectively, locking the female dies 2 on the base 1, and compacting the fiber fabric by using the female dies 2;
(6) and (3) curing: placing the mold horizontally and sending the mold into an oven, and curing the mold according to a curing process;
(7) demolding: after solidification, closing the oven, taking out the mold after the temperature of the mold is reduced to be lower than 70 ℃, unloading the base 1, gradually drawing out the core mold 3, and taking down the female molds 2 on the two sides to obtain a primary product;
(8) hole making and trimming: and (3) conveying the primary product obtained in the step (7) to a machining center for drilling, cutting off an allowance area after hole making is finished, and polishing burrs and a resin-rich area on the edge until the burrs and the resin-rich area are smooth to obtain a final product (shown in figure 4).
In order to further improve the curing effect, the curing process is characterized in that in the step (6) (as shown in figure 5), the temperature of the oven is firstly raised to 80 ℃, the temperature is kept at 80 ℃ for 30min, after the temperature is kept for 30min, the temperature of the oven is raised to 140 ℃, the temperature is kept at 140 ℃ for 30min, after the temperature is kept for 30min, the temperature of the oven is raised to 210 ℃, the temperature is kept at 210 ℃ for 30min, after the temperature is kept for 30min, the temperature of the oven is raised to 260 ℃, when the temperature of the oven is 260 ℃, the bolt of the mold is loosened to discharge gas for 3min, after the air release is finished, the bolt is fastened, the temperature of the oven is raised to 310 ℃, the temperature is kept at 310 ℃ for 30min, after the temperature is kept for 30min, the temperature of the oven is raised to 340 ℃, the temperature is kept at 340 ℃ for 1h, after the temperature is kept for 1h, the temperature of the oven is raised to 370 ℃, after the temperature is kept for 1h at 370, and (4) heating the oven to 390 ℃, and preserving the heat at 390 ℃ for 2h to finish curing.
In order to make the fiber fabric tightly attached to the core mold 3, in step (3), every time one layer of fiber fabric is laid, a layer of XY5011 resin is brushed on the fiber fabric by using a hairbrush, so that the resin is soaked into the fiber fabric until all the fiber fabric is laid.
In order to further improve the strength and the bending resistance of the product, in the step (3), every four layers of fiber fabrics form a group of paving components, the paving angles of all layers of each group of paving components are 45 degrees, 0 degree, 45 degrees and 90 degrees in sequence, and the thickness of each layer of fiber fabrics is 0.2 mm; here, the upward central axis direction of the core mold 3 in the longitudinal direction (the direction indicated by the arrow shown in fig. 6) is set as a layer angle of 0 °, 45 ° counterclockwise in this direction is set as a layer angle of 45 °, 45 ° clockwise in this direction is set as a layer angle of-45 °, and 90 ° counterclockwise in this direction is set as a layer angle of 90 °.
In order to make each layer of fiber fabric tightly attached, in the step (3), 4 layers of fiber fabrics are attached to each layer of fiber fabric, the core mold 3 is placed into an oven with the temperature of 80 ℃ for drying for 15min, after drying is finished, the core mold 3 is taken out, and the fiber fabrics are continuously attached to each layer of fiber fabric.
In order to facilitate the extraction of the core mold 3, the core mold 3 is composed of a plurality of core modules, a plurality of connecting pins are distributed on the groove of the base 1, pin holes corresponding to the connecting pins are arranged at the bottom of the core modules, each core module is correspondingly installed in the groove of the base 1, and in the step (7), the core modules are extracted one by one.
The carbon fiber fabric in the embodiment is preferably T300 carbon fiber twill fabric, and the mechanical properties of the T300/XY5011 composite material are shown in Table 1.
TABLE 1T 300/XY5011 mechanical Properties of the composite Material
As can be seen from Table 1, the T300/XY5011 composite material system has better mechanical properties at normal temperature, and the mechanical properties are higher than normal temperature in medium-high temperature environment. The mechanical property retention rate is high under the environment of 500 ℃, and the use condition of the nose cone under the high-temperature environment can be met.
The preparation cost is low, and the prepared nose cone is light in weight, high-temperature resistant, high in strength and good in bending resistance, and can meet the requirement of higher flying speed; can be used for preparing the airplane nose cone.
Example 2
The difference between this embodiment and embodiment 1 is that in step (3), when the fiber fabric is applied to the core mold 3, specifically, the two surfaces of the core mold 3 are respectively applied, the fiber fabric with the surface edge on one surface is turned over the joint of the surface layer edges to be butted with the layer on the other surface, and the seams between different layers are staggered.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts based on the disclosed technical solutions, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. A preparation method of a heat-resistant nose cone is characterized by comprising the following steps,
(1) fiber fabric blanking: drawing the appearance of each layer of fiber fabric by using three-dimensional software, guiding the appearance into an operating system of an automatic blanking machine, putting the fiber fabric on a bracket of the automatic blanking machine, cutting each material sheet according to an European program, and identifying the number by using label paper;
(2) preparation of a mold: disassembling a die, cleaning residues on the surface of each part, wiping the die parts by using clean cloth tapes to soak acetone after cleaning the residues, cleaning residues and dirt, then wiping the inner cavity of the die by using the clean cloth tapes to soak a release agent, wiping the release agent again after the release agent is dried, repeatedly wiping the release agent for 5 times, wiping the release agent again after 15 minutes of interval between every two times, and installing an aluminum mold core on a die bottom plate after wiping the last release agent, and fixing the aluminum mold core by using bolts;
(3) paving a fiber fabric: calculating the using amount of resin according to the weight of the carbon fiber fabric, and weighing for later use; the cut carbon fiber fabric is laid on a clean and bright platform, polyimide resin is coated on the surface of the carbon fiber fabric by a brush and soaked, the carbon fiber fabric is pushed into a drying box after the coating is finished, the temperature is raised to 80 ℃, the carbon fiber fabric is dried for 1 hour, and the carbon fiber fabric is taken out for standby after the drying is finished; brushing a layer of resin on the surface of the core mold, and paving the fiber fabric on the surface of the core mold layer by layer according to a paving sequence;
(4) vacuumizing: wrapping the paved core mold with a pasted vacuum bag, vacuumizing the vacuum bag at normal temperature, and compacting each layer of fiber fabric by using vacuum pressure;
(5) die assembly: after the fiber fabric is compacted, taking down the vacuum bag, respectively and correspondingly combining the two female dies on the two sides of the core die, locking the female dies on the base, and tightly pressing the fiber fabric by using the female dies;
(6) and (3) curing: placing the mold horizontally and sending the mold into an oven, and curing the mold according to a curing process;
(7) demolding: after solidification, closing the oven, taking out the mold after the temperature of the mold is reduced to be lower than 70 ℃, unloading the base, gradually drawing out the core mold, and taking down the female molds on the two sides to obtain a primary product;
(8) hole making and trimming: conveying the primary product obtained in the step (7) to a machining center for drilling, cutting off a surplus area after hole making is finished, and polishing burrs and a resin-rich area on the edge until the burrs and the resin-rich area are smooth to obtain a final product;
the core mould is composed of a plurality of core modules, a plurality of connecting pins are distributed on the groove of the base, pin holes corresponding to the connecting pins are formed in the bottom of each core module, each core module is correspondingly installed in the groove of the base, and in the step (7), the core modules are only required to be pulled out one by one.
2. The preparation method of the heat-resistant nose cone according to claim 1, wherein in the step (6), the curing process specifically comprises the steps of raising the temperature of an oven to 80 ℃, keeping the temperature at 80 ℃ for 30min, keeping the temperature for 30min, raising the temperature of the oven to 140 ℃, keeping the temperature at 140 ℃ for 30min, keeping the temperature for 30min, raising the temperature of the oven to 210 ℃, keeping the temperature at 210 ℃ for 30min, keeping the temperature for 30min, raising the temperature of the oven to 260 ℃, loosening bolts of a mold to discharge gas for 3min when the temperature of the oven is 260 ℃, fastening bolts after air release, raising the temperature of the oven to 290 ℃, loosening bolts of the mold to discharge gas for 3min when the temperature of the oven is 290 ℃, fastening bolts after air release, raising the temperature of the oven to 310 ℃, keeping the temperature at 310 ℃ for 30min, keeping the temperature for 30min, raising the temperature of the oven to 340 ℃, keeping the temperature at 340 ℃ for 1h, raising the temperature of the oven to 370 ℃, keeping the temperature at 370 ℃ for 1h, after the heat preservation is carried out for 1h, the oven is heated to 390 ℃, the heat preservation is carried out for 2h at 390 ℃, and the curing is finished.
3. The method for preparing a heat-resistant nose cone as claimed in claim 1, wherein in the step (3), each layer of the fiber fabric is coated, a layer of resin is brushed on the fiber fabric by using a hairbrush, and the resin is impregnated into the fiber fabric until all the fiber fabric layers are coated.
4. The method for preparing a heat-resistant nose cone as claimed in claim 1, wherein in the step (3), every four layers of the fiber fabric are arranged in a group of paving assemblies, and the paving angles of the layers of each group of paving assemblies are 45 °, 0 °, -45 ° and 90 ° in sequence.
5. The method for preparing the heat-resistant nose cone as claimed in claim 3 or 4, wherein in the step (3), for every 4 layers of fiber fabrics, the core mold is placed into an oven with the temperature of 80 ℃ for drying for 15min, and after drying is finished, the core mold is taken out and the fiber fabrics are continuously paved.
6. The method for preparing a heat-resistant nose cone according to claim 5, wherein in the step (3), when the fiber fabric is applied to the core mold, specifically, the two surfaces of the core mold are respectively applied, and the joint of the two surfaces is applied with the strip-shaped patch.
7. The method for preparing a heat-resistant nose cone as claimed in claim 5, wherein in the step (3), when the fiber fabric is applied to the core mold, specifically, the fiber fabric is applied to two surfaces of the core mold respectively, the fiber fabric with the surface edge on one surface is turned over the joint of the surface layer edges to be in butt joint with the layer on the other surface, and the seams between different layers are staggered.
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| CN111186143B (en) * | 2019-12-26 | 2021-07-30 | 航天神舟飞行器有限公司 | Integrated forming process for composite nose cone of unmanned aerial vehicle electric cabin |
| CN111964537A (en) * | 2020-09-03 | 2020-11-20 | 天津爱思达新材料科技有限公司 | Composite material cross beam and forming tool and forming method thereof |
| CN112743872B (en) * | 2020-12-25 | 2022-09-20 | 中国航空制造技术研究院 | RTM (resin transfer molding) mold and method for large-curvature special-shaped structure composite material part |
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