CN113353110B - Carbon fiber composite material end wall structure and forming process thereof - Google Patents
Carbon fiber composite material end wall structure and forming process thereof Download PDFInfo
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- CN113353110B CN113353110B CN202110564583.0A CN202110564583A CN113353110B CN 113353110 B CN113353110 B CN 113353110B CN 202110564583 A CN202110564583 A CN 202110564583A CN 113353110 B CN113353110 B CN 113353110B
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- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 27
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 27
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 75
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 210000003205 muscle Anatomy 0.000 abstract description 12
- 238000011112 process operation Methods 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000463 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
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
- B61D17/04—Construction details of vehicle bodies with bodies of metal; with composite, e.g. metal and wood body structures
- B61D17/06—End walls
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Moulding By Coating Moulds (AREA)
- Revetment (AREA)
Abstract
The invention relates to the technical field of end wall structures, in particular to a carbon fiber composite end wall structure and a forming process thereof, comprising the following steps: an outer skin, and a support frame for supporting the outer skin, the support frame including vertical ribs, corner reinforcements, and lateral ribs; the corner reinforcing piece is the arch structure, and the symmetry is equipped with a plurality of constant head tanks on the corner reinforcing piece, forms first die cavity between constant head tank and the outer covering, and horizontal muscle sets up in first die cavity, is equipped with a plurality of draw-in grooves on the perpendicular muscle, and perpendicular muscle passes through the draw-in groove to be connected on horizontal muscle, and the one end of perpendicular muscle connection corner reinforcing piece is equipped with first slope type groove, and the plane in first slope type groove is connected with the corner reinforcing piece. Compared with the prior art, the transverse ribs, the vertical ribs and the corner reinforcing parts are integrally formed by adopting the carbon fiber composite material, so that the number of parts is reduced, the end wall realizes the integrated forming from the structural design to the manufacturing of the composite material, the assembly cost and the manufacturing cost are reduced, and the strength and the rigidity can meet the use requirements.
Description
Technical Field
The invention relates to the technical field of end wall structures, in particular to a carbon fiber composite end wall structure and a forming process thereof.
Background
Currently, rail transit equipment has become a beautiful name card manufactured by China technology, china equipment and China. Along with the high-speed development of the rail transit field at home and abroad, the weight reduction of the rail transit is receiving higher and higher importance. The weight reduction of the rail transit has particularly important practical significance in the aspects of vehicle weight reduction, speed increase, noise reduction, energy consumption reduction, riding comfort improvement and the like. The end walls are positioned at the front end and the rear end of the subway train body, form a closed space with the train body and the underframe, and are used for installing a through passage between adjacent train bodies so as to facilitate the passengers to pass through.
In the prior art, the end wall generally adopts a structural form formed by welding a plurality of metal beams, sectional materials and plates, so that the assembly workload is increased, the assembly cost and the manufacturing cost are higher, and meanwhile, the development requirement of the light rail transit is difficult to meet.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the carbon fiber composite material end wall structure and the forming process thereof are provided, the assembly workload is reduced, the assembly cost and the manufacturing cost are reduced, and the development requirement of light rail transit is met.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a carbon fiber composite material end wall structure and a forming process thereof comprise: an outer skin, and a support frame for supporting the outer skin, the support frame including vertical ribs, corner reinforcements, and lateral ribs;
The corner reinforcing piece is of an arch structure, a plurality of positioning grooves are symmetrically formed in the corner reinforcing piece, a first cavity is formed between the positioning grooves and the outer skin, transverse ribs are arranged in the first cavity, a plurality of clamping grooves are formed in vertical ribs, the vertical ribs are connected to the transverse ribs through the clamping grooves, a first slope-shaped groove is formed in one end of the corner reinforcing piece, and the plane of the first slope-shaped groove is connected with the corner reinforcing piece.
Further, a bottom reinforcement is arranged at the bottom opening of the corner reinforcement, two end parts of the corner reinforcement and the outer skin form a second cavity, and the bottom reinforcement is arranged in the second cavity.
Further, the bottom reinforcement is U type structure, just the bottom reinforcement is close to one side of horizontal muscle is equipped with the extension board, the extension board with horizontal muscle parallel and level butt joint.
Further, the end part of the vertical rib, which is close to the bottom reinforcement, is provided with a second slope-shaped groove and a third slope-shaped groove, the plane of the second slope-shaped groove is connected with the slope surface of the third slope-shaped groove, the bottom reinforcement is embedded into the third slope-shaped groove, and the extension plate is embedded into the second slope-shaped groove.
Further, a second reinforcement is arranged inside the bottom reinforcement, and the second reinforcement is arranged flush with the extension plate.
Further, a first contact surface and a second contact surface are arranged on the corner reinforcing piece, the first contact surface is perpendicular to the second contact surface, and the first contact surface is communicated with the positioning groove on the second contact surface.
Further, a cavity is arranged on one side, facing the outer skin, of the transverse rib, and a first reinforcing piece is arranged in the cavity;
The first reinforcement comprises a first plate and a second plate, the first plate protrudes towards the inner part of the cavity, a groove is formed between the protrusion and the outer skin, and the second plate is fixed at the groove to form a closed area.
Further, the transverse ribs and the vertical ribs are made of carbon fiber composite materials and are of omega-shaped structures, and the vertical ribs and the transverse ribs are fixedly connected in a cementing and riveting combined mode.
The molding process of the carbon fiber composite material end wall structure comprises the following steps:
Step1: manufacturing a forming die, and placing the cured and formed vertical ribs into the forming die;
Step2: disposing a corner reinforcement in a forming mold;
Step 3: placing the cured and formed transverse ribs into clamping grooves of the vertical ribs and positioning grooves of the corner reinforcing pieces;
step 4: placing the bottom reinforcement in a mold;
Step 5: placing a first reinforcement in the transverse bar of step 3 and a second reinforcement in the bottom reinforcement of step 4;
Step 6: paving wet skins integrally, and curing in an autoclave;
step 7: and after curing, cooling to a certain temperature and demoulding.
Further, the corner reinforcing member in the step2 is integrally formed by die pressing, and the first reinforcing member and the second reinforcing member in the step 5 are integrally formed by pultrusion.
The beneficial effects of the invention are as follows: compared with the prior art, the transverse ribs, the vertical ribs and the corner reinforcing parts are integrally formed by adopting the carbon fiber composite material structure, so that the assembly workload is reduced, the end wall is integrally formed by adopting the composite material forming process, the process operation is simple, the accuracy of the positions of the transverse ribs, the vertical ribs and the corner reinforcing parts is effectively ensured, the integrated forming from the structural design to the manufacturing of the composite material is realized, the assembly cost and the manufacturing cost are reduced, and the development requirement of the light weight of the rail transit is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is an exploded view of an end wall structure of a carbon fiber composite material in an embodiment of the present invention;
FIG. 2 is a general assembly view of an end wall structure made of carbon fiber composite material according to an embodiment of the present invention;
FIG. 3 is a schematic view of a corner reinforcement in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a structure of a vertical bar according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is an enlarged view of a portion of FIG. 4 at B;
FIG. 7 is a schematic view of a bottom reinforcement member according to an embodiment of the present invention;
FIG. 8 is a cut-away view of FIG. 2C-C;
Fig. 9 is a schematic view of another structure of the first reinforcement member according to the embodiment of the present invention.
FIG. 10 is a flow chart of a process for forming a carbon fiber composite end wall structure in accordance with an embodiment of the present invention;
Reference numerals: 1. an outer skin; 2. vertical ribs; 21. a clamping groove; 22. a first slope type groove; 23. a second slope type groove; 24. a third slope type groove; 3. corner reinforcements; 31. a first cavity; 32. a second cavity; 33. a first contact surface; 34. a second contact surface; 4. transverse ribs; 5. a first reinforcement; 51. a first plate; 52. a second plate; 53. a closed region; 6. a bottom reinforcement; 61. an extension plate; 7. and a second reinforcing member.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The carbon fiber composite headwall structure as shown in fig. 1 to 9 includes: an outer skin 1 and a support frame for supporting the outer skin 1, the support frame comprising vertical bars 2, corner reinforcements 3 and lateral bars 4; the corner reinforcement 3 is the arch structure, and the symmetry is equipped with a plurality of constant head tanks on the corner reinforcement 3, forms first die cavity 31 between constant head tank and the outer covering 1, and horizontal muscle 4 sets up in first die cavity 31, is equipped with a plurality of draw-in grooves 21 on the perpendicular muscle 2, and perpendicular muscle 2 passes through draw-in groove 21 to be connected on horizontal muscle 4, and the one end that perpendicular muscle 2 connects the corner reinforcement 3 is equipped with first slope type groove 22, and the plane and the corner reinforcement 3 of first slope type groove 22 are connected.
According to the invention, the transverse ribs 4, the vertical ribs 2 and the corner reinforcing pieces 3 are integrally formed by adopting a carbon fiber composite material structure in the preferred embodiment, so that the number of parts is reduced, the heat insulation performance is excellent, the accuracy of the positions of the transverse ribs 4 and the vertical ribs 2 is effectively ensured through the arrangement of the positioning grooves and the clamping grooves 21, the end wall is integrally formed by adopting a composite material forming process, the process operation is simple, the repeatability is good, the integrated forming from the composite material structure design to the manufacturing is realized, the assembly cost and the manufacturing cost are reduced, and the strength and the rigidity can meet the use requirements.
On the basis of the embodiment, the bottom reinforcement 6 is arranged at the bottom opening of the corner reinforcement 3, the two ends of the corner reinforcement 3 and the outer skin 1 form the second cavity 32, and the bottom reinforcement 6 is arranged in the second cavity 32. The second cavity 32 is designed towards the opening of the underframe, so that the contact area between the end wall and the underframe of the car body is increased, and the reliability of the connection between the end wall and the car body is improved.
In order to further strengthen the bulk strength of the end wall, the bottom reinforcement 6 is of a U-shaped structure, and one side of the bottom reinforcement 6, which is close to the transverse ribs 4, is provided with an extension plate 61, the extension plate 61 is in flush joint with the transverse ribs 4, and the bottom reinforcement 6 and the transverse ribs 4 are arranged at the bottom of the end wall, so that the dual reinforcement effect is realized, and the stability of the end wall when bearing loads is effectively ensured.
For the stability of the end wall in the integral structure, the end part of the vertical rib 2, which is close to the bottom reinforcement member 6, is provided with a second slope type groove 23 and a third slope type groove 24, the plane of the second slope type groove 23 is connected with the slope surface of the third slope type groove 24, the bottom reinforcement member 6 is embedded into the third slope type groove 24, the extension plate 61 is embedded into the second slope type groove 23, and the bottom reinforcement member 6 and a plurality of transverse ribs 4 are integrated through the second slope type groove 23 and the third slope type groove 24, so that the end wall structure is firmer, and the load bearing capacity of the end wall is improved.
On the basis of the above embodiment, preferably, the second reinforcement 7 is provided inside the bottom reinforcement 6, and the second reinforcement 7 is provided flush with the extension plate 61, and the strength of the bottom reinforcement 6 itself is increased by the provision of the second reinforcement 7, thereby improving the strength of the end wall overall structure.
In the preferred embodiment of the present invention, as shown in fig. 3, the corner reinforcing member 3 is provided with a first contact surface 33 and a second contact surface 34, the first contact surface 33 is disposed perpendicular to the second contact surface 34, and the first contact surface 33 communicates with a positioning groove on the second contact surface 34.
In order to ensure the load bearing capacity of the transverse ribs 4, a cavity is arranged on one side of the transverse ribs 4, which faces the outer skin 1, and a first reinforcing piece 5 is arranged in the cavity; as shown in fig. 8 to 9, the first reinforcement 5 includes a first plate 51 and a second plate 52, the first plate 51 protrudes toward the inside of the cavity, a groove is formed between the protrusion and the outer skin 1, the second plate 52 is fixed at the groove to form a closed area 53, the strength of the transverse rib 4 is enhanced by the arrangement of the first reinforcement 5, and the closed area 53 in the first reinforcement 5 forms a supporting cavity structure, so that the load bearing capacity is further enhanced.
In the embodiment of the invention, the transverse ribs 4 and the vertical ribs 2 are made of carbon fiber composite materials and are in omega-shaped structures, and the vertical ribs 2 and the transverse ribs 4 are fixedly connected in a cementing and riveting combined mode. The end wall formed by the carbon fiber composite material with flame retardant property has light weight, high strength and high rigidity, reduces the weight of a vehicle body, reduces noise and vibration, improves safety and comfort, reduces assembly workload, and reduces assembly cost and manufacturing cost.
In a preferred embodiment of the present invention, a process for forming a carbon fiber composite end wall structure, as shown in fig. 10, includes the following steps:
step 1: manufacturing a forming die, and placing the cured and formed vertical ribs 2 into the forming die;
step 2: arranging the corner reinforcements 3 in a forming mold;
step 3: placing the cured and molded transverse ribs 4 into the clamping grooves 21 of the vertical ribs 2 and the positioning grooves of the corner reinforcing pieces 3;
step 4: placing the bottom reinforcement in a mold;
Step 5: placing the first reinforcement 5 in the transverse bar 4 of step 3 and the second reinforcement 7 in the bottom reinforcement of step 4;
Step 6: paving wet skins integrally, and curing in an autoclave;
step 7: and after curing, cooling to a certain temperature and demoulding.
On the basis of the above embodiment, the corner reinforcing member 3 in step 2 is integrally formed by compression molding, and the first reinforcing member 5 and the second reinforcing member 7 in step 5 are integrally formed by pultrusion. The structure/function integrated and modularized design is adopted for the opposite end wall structure, and the structure/function integrated and modularized design is integrally formed by adopting a low-cost composite material forming process, so that the total cost of the carbon fiber composite material vehicle body is reduced as a whole, the performance characteristics of the carbon fiber composite material are fully exerted, and the safety performance is greatly improved.
According to the invention, the transverse ribs 4, the vertical ribs 2 and the corner reinforcing pieces 3 are integrally formed by adopting a carbon fiber composite material structure in the preferred embodiment, so that the number of parts is reduced, the heat insulation performance is excellent, the accuracy of the positions of the transverse ribs 4 and the vertical ribs 2 is effectively ensured through the arrangement of the positioning grooves and the clamping grooves 21, the end wall is integrally formed by adopting a composite material forming process, the process operation is simple, the repeatability is good, the integrated forming from the composite material structure design to the manufacturing is realized, the assembly cost and the manufacturing cost are reduced, and the strength and the rigidity can meet the use requirements.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A carbon fiber composite headwall structure, comprising: an outer skin (1), and a support frame for supporting the outer skin (1), the support frame comprising vertical ribs (2), corner reinforcements (3) and transverse ribs (4); the vertical ribs (2), the corner reinforcing pieces (3) and the transverse ribs (4) are integrally formed by adopting a carbon fiber composite material structure;
the corner reinforcing piece (3) is of an arch structure, a plurality of positioning grooves are symmetrically formed in the corner reinforcing piece (3), a first cavity (31) is formed between the positioning grooves and the outer skin (1), transverse ribs (4) are arranged in the first cavity (31), a plurality of clamping grooves (21) are formed in the vertical ribs (2), the vertical ribs (2) are connected to the transverse ribs (4) through the clamping grooves (21), a first slope-shaped groove (22) is formed in one end, connected with the corner reinforcing piece (3), of the vertical ribs (2), and the plane of the first slope-shaped groove (22) is connected with the corner reinforcing piece (3);
a bottom reinforcement (6) is arranged at the bottom opening of the corner reinforcement (3), a second cavity (32) is formed between the two end parts of the corner reinforcement (3) and the outer skin (1), and the bottom reinforcement (6) is arranged in the second cavity (32);
a cavity is arranged on one side of the transverse rib (4) facing the outer skin (1), and a first reinforcing piece (5) is arranged in the cavity;
The first reinforcement (5) comprises a first plate (51) and a second plate (52), the first plate (51) protrudes towards the cavity, a groove is formed between the protrusion and the outer skin (1), and the second plate (52) is fixed at the groove to form a closed area (53);
The bottom reinforcement (6) is of a U-shaped structure, an extension plate (61) is arranged on one side, close to the transverse ribs (4), of the bottom reinforcement (6), and the extension plate (61) is in flush butt joint with the transverse ribs (4);
The end part of the vertical rib (2) close to the bottom reinforcement (6) is provided with a second slope-type groove (23) and a third slope-type groove (24), the plane of the second slope-type groove (23) is connected with the slope surface of the third slope-type groove (24), the bottom reinforcement (6) is embedded into the third slope-type groove (24), and the extension plate (61) is embedded into the second slope-type groove (23);
a second reinforcement (7) is arranged in the bottom reinforcement (6), and the second reinforcement (7) is arranged in parallel with the extension plate (61);
The corner reinforcing piece (3) is provided with a first contact surface (33) and a second contact surface (34), the first contact surface (33) is perpendicular to the second contact surface (34), and the first contact surface (33) is communicated with the positioning groove on the second contact surface (34).
2. The carbon fiber composite material end wall structure according to claim 1, wherein the transverse ribs (4) and the vertical ribs (2) are made of carbon fiber composite materials and are all in omega-shaped structures, and the vertical ribs (2) and the transverse ribs (4) are fixedly connected in a cementing and riveting combined mode.
3. A process for forming a carbon fiber composite headwall structure according to claim 1 or 2, comprising the steps of:
Step 1: manufacturing a forming die, and placing the vertical ribs (2) after curing and forming into the forming die;
Step 2: -arranging corner reinforcements (3) in a forming mould;
Step 3: placing the transverse ribs (4) after the solidification and the molding into the clamping grooves (21) of the vertical ribs (2) and the positioning grooves of the corner reinforcing pieces (3);
step 4: placing the bottom reinforcement in a mold;
Step 5: placing a first reinforcement (5) in the transverse bar (4) of step 3 and a second reinforcement (7) in the bottom reinforcement of step 4;
Step 6: paving wet skins integrally, and curing in an autoclave;
step 7: and after curing, cooling to a certain temperature and demoulding.
4. A process for forming a carbon fiber composite end wall structure according to claim 3, wherein the corner reinforcement (3) in step 2 is integrally formed by compression molding, and the first reinforcement (5) and the second reinforcement (7) in step 5 are integrally formed by pultrusion.
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| CN202110564583.0A CN113353110B (en) | 2021-05-24 | 2021-05-24 | Carbon fiber composite material end wall structure and forming process thereof |
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| CN202110564583.0A CN113353110B (en) | 2021-05-24 | 2021-05-24 | Carbon fiber composite material end wall structure and forming process thereof |
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| CN113771891B (en) * | 2021-09-28 | 2022-08-02 | 常州市新创智能科技有限公司 | Apron board of rail transit vehicle body and forming process thereof |
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| CN113353110A (en) | 2021-09-07 |
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