CN110978564B - Integral forming method of U-shaped unit reinforced wall plate - Google Patents
Integral forming method of U-shaped unit reinforced wall plate Download PDFInfo
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- CN110978564B CN110978564B CN201911283573.9A CN201911283573A CN110978564B CN 110978564 B CN110978564 B CN 110978564B CN 201911283573 A CN201911283573 A CN 201911283573A CN 110978564 B CN110978564 B CN 110978564B
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- unit
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/04—Making preforms by assembling preformed material
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
-
- 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 is a method for forming integrally of U-shaped unit stiffened wall panel, the method lays the prepreg on skin forming mould 6 and unit forming mould 7, then assembles them together, takes out unit forming mould 7 before solidifying, and only keeps skin forming mould 6, the method can meet the requirements of forming quality and verticality of stud in the part, at the same time, the temperature field uniformity of the mould is improved, the quality of the product is guaranteed, the manufacturing period is short, and the production cost is reduced. The U-shaped unit stiffened wall plate prepared by the method has high integration degree, good weight reduction effect and high safety, and provides an important key technology for the application of the composite material in large-scale airplanes.
Description
Technical Field
The invention relates to an integral forming method of a U-shaped unit stiffened wall plate, belonging to the field of composite material wall plate forming.
Background
At present, composite materials are more and more widely applied to aerospace structures, and parts and quantity applied to airplanes become one of important indexes for measuring the advancement of airplane structures.
The traditional composite material wall plate reinforcement form comprises an L-shaped reinforcement wall plate, a T-shaped reinforcement wall plate, an I-shaped reinforcement wall plate, a J-shaped reinforcement wall plate and the like, as shown in figure 1, the sizes of the vertical rib web plates of the wall plates are about 10-50 mm, and in the autoclave forming process, all dies need to be assembled together and then subjected to autoclave forming together in order to ensure the quality of the assembled and formed wall plates. With the application of the composite material in an aviation structure being more and more extensive, the formed wall plate is larger and larger, the structure gradually tends to be integrated, the size of the stud web plate is about 100-400 mm, as shown in fig. 2, and fig. 2 is a U-shaped reinforced wall plate and requires integral forming. If the traditional method is adopted for forming, the size of the side vertical rib forming die is large, and the following defects exist:
1. the vertical rib mold and the skin mold are in over-hard fit, so that fit clearance is ensured to exist between the vertical rib mold and the skin mold, uneven pressure transmission is caused, and internal quality defects are easily caused;
2. too many moulds are arranged in the vacuum bag, so that uneven heat transfer is caused, the temperature rising and falling speed of the wall plate is slow and is difficult to control, internal quality defects are caused, the tank inlet time is long, the uniformity of a temperature field is poor, and the multi-mould tank inlet cannot be realized;
3. the problems of the precision of the reverse rotation, the matching and the positioning of the die exist, so that the difficulty of the die processing and the operation in the process is increased, the defects are easy to generate, and the cost is increased;
4. during the curing process, the axis degree shifts due to the coefficient of thermal expansion of the mold.
Disclosure of Invention
The invention provides an integral forming method of a U-shaped unit stiffened wall plate aiming at the defects in the prior art and aims to realize the integral forming of a large-size stiffened wall plate.
The purpose of the invention is realized by the following technical scheme:
in this kind of U-shaped unit adds muscle wallboard's whole forming method, U-shaped unit adds muscle wallboard includes covering 1 and a plurality of U-shaped units 2 that arrange in proper order at covering 1, and U-shaped unit 2 includes the stud 4 of both sides and the web 5 of bottom, and the stud 4 of adjacent U-shaped unit 2 links together, and web 5 links together with covering 1, and the one-way area 3, its characterized in that are filled to the clearance that forms between U-shaped unit 2 and the covering 1: the forming method comprises the following steps:
respectively blanking according to the design requirements of a skin 1 and a U-shaped unit 2;
secondly, respectively paving the skin forming mould 6 of the skin 1 and the unit forming mould 7 of the U-shaped unit 2 according to the layering sequence;
thirdly, sequentially positioning and assembling the unit forming molds 7 which are completely laid on an assembling platform 8, wherein a positioning baffle 9 is arranged on the assembling platform 8, and one ends of the unit forming molds 7 are abutted against the positioning baffle 9;
filling the unidirectional tape 3 between the adjacent unit forming dies 7, and positioning and assembling the unidirectional tape on the skin forming die 6 after the unidirectional tape is integrally turned over;
step five, taking out the unit forming die 7 upwards in sequence to obtain a prefabricated member of the U-shaped unit reinforced wall plate 10;
sixthly, paving air guide materials, isolating materials and a vacuum bag outside the prefabricated part for packaging, and placing L-shaped angle bars on two sides of the packaged stud 4 to maintain the verticality of the stud;
and step seven, placing the packaged prefabricated member with the skin forming die 6 into a hot pressing tank, and curing to obtain the U-shaped unit reinforced wall plate 10.
In one implementation, the surface of the skin forming mold 6 has the same shape as the outer shape of the skin, has a certain rigidity, and cannot be easily deformed, and the skin forming mold 6 is a frame mold or a flat mold according to different shapes and sizes.
In one implementation, the skin 1 is laid by an automatic tape laying machine, an automatic filament laying machine, or manually.
In one embodiment, the unit forming die 7 is a rectangular die having a rectangular shape with a rectangular cross section having a rectangular shape with a rectangular shape, the overlapping surface of the unit forming die 7 is the same as the inner profile of the U-shaped unit 2, and the non-overlapping surface of the unit forming die 7 is a flat surface.
In one implementation, the unit forming dies 7 are assembled on the assembly platform 8, and the unit forming dies 7 are positioned and assembled together by pins and screws.
In one implementation, the R angle between the studs 4 and the bottom web 5 of the U-shaped unit 2 is between 1mm and 8 mm.
In one implementation, the height of the studs 4 of the U-shaped unit 2 is between 15mm and 80 mm.
In one implementation, the assembled unit-forming mold 7 is positioned on the skin-forming mold 6 by means of two end pins or locating posts.
The technical scheme of the invention has the characteristics and beneficial effects that:
according to the technical scheme, the mould is simple to position in the forming process, only the skin forming mould 6 is arranged in the curing process, the requirements of the internal forming quality and the verticality of studs of parts can be met, the uniformity of the temperature field of the mould is improved, the quality of products is guaranteed, the manufacturing period is short, and the production cost is reduced, and the method solves a plurality of technical difficulties, and specifically comprises the following steps:
firstly, the unit forming die 7 is not fed into the tank along with the part, the pressurizing and heating process is not carried out, and the die material and the manufacturing cost are low;
secondly, a mould is not placed on the part, a fit clearance does not exist, pressure is directly applied to the part, and the internal quality of the part is good;
thirdly, the part in the vacuum bag is not provided with a die, so that the heat transfer performance is good, the temperature rise uniformity of the part is good, and multiple parts can be cured in a large hot-pressing tank at one time;
fourthly, the unit forming die 7 is assembled on an assembling platform 8, the assembling platform 8 is a plane, the assembling difficulty is low, and the precision is high;
and fifthly, the unit forming die 7 is assembled on the skin forming die 6 after being integrally assembled, so that the unidirectional tape 3 can be conveniently filled, and the integral one-step positioning is realized, and the positioning precision is high.
Drawings
FIG. 1 is a schematic view showing the structure of a conventional ribbed wallboard
FIG. 2 is a schematic structural view of a U-shaped unit stiffened wall panel
FIG. 3 is a schematic view showing the shape and structure of U-shaped unit 2 of the U-shaped unit stiffened wall panel
FIG. 4 is a schematic view of the assembly structure of the unit forming mold 7 after the completion of the lay-up, which is performed in the order of FIGS. 4a, 4b, 4c, 4d, and 4e
FIG. 5 is a schematic view of the combined structure of the combined unit forming mold 7 and skin forming mold 6
In the figure: 1: covering a skin; 2: a U-shaped unit; 3: a unidirectional tape; 4: erecting ribs; 5: a web; 6: a skin forming die; 7: a unit forming die; 8: assembling the platform; 9: positioning a baffle plate; 10: u-shaped unit adds muscle wallboard.
Detailed Description
The technical scheme of the invention is further detailed in the following by combining the drawings and the embodiment:
the U-shaped unit stiffened wall plate 10 with the height of the stud being 20mm, the R angle being 2mm and the width of the web plate being 100mm is prepared, the skin forming die 6 is a frame type die with the size of 2200mm 700mm 600mm, the 2000mm 500mm in the appearance of the upper surface of the die is the same as the outer shape of the skin, and the appearance of other upper surfaces is a plane, so that the later-stage packaging is facilitated. The unit forming die 7 is a rectangular die with a rigid cross section of a shape of Chinese character 'hui' with 100mm x 50mm, the overlapping surface of the unit forming die 7 is the same as the inner profile surface of the U-shaped unit 2, and the non-overlapping surface of the unit forming die 7 is a plane. The assembly platform 8 is a 2200mm x 700mm platform, and a 600mm x 30mm x 20mm positioning baffle 9 is arranged on the assembly platform 8. The forming method comprises the following steps
Respectively blanking according to the design requirements of a skin 1 and a U-shaped unit 2;
step two, the skin 1 is laid on the skin forming die 6 through an automatic tape laying machine; laying the U-shaped units 2 on the unit forming die 7 according to the layering sequence;
thirdly, referring to the attached figure 4a, placing 5 overlapped unit forming molds 7 on an assembly platform 8 in sequence, wherein one end of each unit forming mold 7 is abutted against a positioning baffle 9, and connecting, positioning and assembling the unit forming molds 7 together through pins and screws;
step four, as shown in the attached figures 4b, 4c, 4d and 5, filling the unidirectional tape 3 between the adjacent unit forming dies 7, and assembling the unidirectional tape on the skin forming die 6 through a positioning pin after the unidirectional tape is integrally turned over;
step five, referring to the attached figure 4e, sequentially taking out the 5 unit forming molds 7 upwards to obtain a prefabricated member of the U-shaped unit reinforced wall plate 10;
laying air guide materials, isolation materials and a vacuum bag outside the prefabricated part for packaging, and placing L-shaped angle bars with the length of 2000mm, the thickness of 2mm and the section of 30mm x 30mm on two sides of the packaged stud 4 to maintain the verticality of the stud;
and step seven, placing the packaged prefabricated member with the skin forming die 6 into a hot pressing tank, and curing to obtain the U-shaped unit reinforced wall plate 10 with the thickness of 2000mm x 500m x 5 mm.
Claims (2)
1. The utility model provides an integral forming method of U-shaped unit reinforced wallboard, U-shaped unit reinforced wallboard includes covering (1) and a plurality of U-shaped unit (2) of arranging in proper order at covering (1), U-shaped unit (2) include stud (4) and the web (5) of bottom of both sides, stud (4) of adjacent U-shaped unit (2) link together, web (5) link together with covering (1), the one-way area (3) are filled in the clearance that forms between U-shaped unit (2) and covering (1), its characterized in that: the R angle between the vertical rib (4) of the U-shaped unit (2) and the web plate (5) at the bottom is phi 1 mm-phi 8mm, the height of the vertical rib (4) of the U-shaped unit (2) is 15 mm-80 mm, and the forming method comprises the following steps:
respectively blanking according to the design requirements of a skin (1) and a U-shaped unit (2);
secondly, respectively paving the skin forming die (6) of the skin (1) and the unit forming die (7) of the U-shaped unit (2) according to a paving sequence;
the surface appearance of the skin forming die (6) is the same as the appearance of the skin, and the skin forming die (6) is a frame type die or a flat plate type die;
the unit forming die (7) is a rectangular die with rigidity and a square-shaped cross section, the laying surface of the unit forming die (7) is the same as the inner profile surface of the U-shaped unit (2), the non-laying surface of the unit forming die (7) is a plane, the unit forming die (7) is assembled on an assembling platform (8), the unit forming die (7) is positioned and assembled together through pins and screws, and the assembled unit forming die (7) is positioned on the skin forming die (6) through two pins at the end or positioning columns;
thirdly, sequentially positioning and assembling the unit forming molds (7) which are completely laid on an assembling platform (8), wherein a positioning baffle (9) is arranged on the assembling platform (8), and one ends of the unit forming molds (7) are abutted against the positioning baffle (9);
filling the unidirectional belt (3) between the adjacent unit forming dies (7), and positioning and assembling the unidirectional belt on the skin forming die (6) after the unidirectional belt is integrally turned over;
taking out the unit forming dies (7) upwards in sequence to obtain a prefabricated member of the U-shaped unit reinforced wall plate (10);
laying air guide materials, isolation materials and a vacuum bag outside the prefabricated part for packaging, and placing L-shaped angle bars on two sides of the packaged stud (4) to maintain the verticality of the stud;
and step seven, placing the packaged prefabricated member with the skin forming die (6) into a hot pressing tank, and curing to obtain the U-shaped unit reinforced wall plate (10).
2. The integral molding method of a U-shaped unit reinforced wall panel according to claim 1, wherein: the covering (1) is laid by an automatic tape laying machine, an automatic wire laying machine or a manual mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283573.9A CN110978564B (en) | 2019-12-13 | 2019-12-13 | Integral forming method of U-shaped unit reinforced wall plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283573.9A CN110978564B (en) | 2019-12-13 | 2019-12-13 | Integral forming method of U-shaped unit reinforced wall plate |
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| Publication Number | Publication Date |
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| CN110978564A CN110978564A (en) | 2020-04-10 |
| CN110978564B true CN110978564B (en) | 2021-11-02 |
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| CN201911283573.9A Active CN110978564B (en) | 2019-12-13 | 2019-12-13 | Integral forming method of U-shaped unit reinforced wall plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116176005A (en) * | 2023-04-17 | 2023-05-30 | 中国飞机强度研究所 | Variable-rigidity T-shaped stiffening plate design method for compression shear stability |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105729830A (en) * | 2016-04-06 | 2016-07-06 | 中航复合材料有限责任公司 | Mandrel-free autoclave integral molding method for U-shaped unit stiffened wallboards |
| CN110480884A (en) * | 2019-08-22 | 2019-11-22 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The manufacturing method of mold, the manufacturing method for assembling preform constructions and wall panel structure |
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- 2019-12-13 CN CN201911283573.9A patent/CN110978564B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105729830A (en) * | 2016-04-06 | 2016-07-06 | 中航复合材料有限责任公司 | Mandrel-free autoclave integral molding method for U-shaped unit stiffened wallboards |
| CN110480884A (en) * | 2019-08-22 | 2019-11-22 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The manufacturing method of mold, the manufacturing method for assembling preform constructions and wall panel structure |
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| CN110978564A (en) | 2020-04-10 |
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