CN111152478A - Resin flow control method for integral forming of hat-shaped reinforced wall plate RFI - Google Patents
Resin flow control method for integral forming of hat-shaped reinforced wall plate RFI Download PDFInfo
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- CN111152478A CN111152478A CN201911282274.3A CN201911282274A CN111152478A CN 111152478 A CN111152478 A CN 111152478A CN 201911282274 A CN201911282274 A CN 201911282274A CN 111152478 A CN111152478 A CN 111152478A
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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Abstract
The invention belongs to the technical field of low-cost manufacture of high-performance resin-based composite materials, and relates to a resin flow control method for integral forming of a hat-shaped reinforced wall plate RFI. In the traditional RFI process, resin flows in the root part of the cap-shaped rib, and flows towards the cap top along two side layers of the cap-shaped rib, so that dry spots are easily generated on the cap top and the cap bottom, and parts are scrapped. The invention considers the structural characteristics of the hat-shaped reinforced wall plate and the resin flow characteristics of the RFI process, decomposes the hat-shaped reinforced wall plate into two structural units of an annular structure and a plate-shaped structure, establishes a resin flow model simultaneously suitable for controlling the resin flow of the annular structure and the plate-shaped structure, forms the RFI integral molding resin flow model of the hat-shaped reinforced wall plate, carries out resin laying and air path arrangement according to the established resin flow model, guides the resin flow in the RFI process, and realizes the complete infiltration of the resin to the preformed body of the hat-shaped reinforced wall plate.
Description
Technical Field
The invention belongs to the technical field of low-cost manufacture of high-performance resin-based composite materials, and relates to a resin flow control method for integral forming of a hat-shaped reinforced wall plate RFI.
Background
With the continuous expansion of the use amount of composite materials, the trend of composite material development is to improve the structural integrity and reduce the manufacturing cost of the composite materials, and as the Resin Film infiltration process, namely RFI, can be combined with three-dimensional reinforcement technologies such as sewing, weaving and the like to improve the interlayer strength and the impact damage resistance of the traditional laminated plate structure, the Resin Film infiltration process is suitable for the integral forming of large-size wall plate members, and is increasingly applied in recent years. The realization of RFI process resin transfer is the key for restricting the success or failure of molding, the RFI resin transfer process is that resin is melted in the temperature rise process, the resin flows under the action of vacuum pressure difference in the system, and soaks a dry fiber preformed body, and the quality of an RFI process finished piece is greatly dependent on the condition that the resin soaks the preformed body.
Hat-type composite stiffened panels are a form of composite stiffened panels commonly used in aircraft construction due to their superior stiffness and have become a very typical panel construction in recent years using the stitch/RFI process. Because the structure of the hat-shaped reinforced wall plate is poor in openness, the integral forming of the RFI of the hat-shaped reinforced wall plate is realized, the forming difficulty of prepreg/autoclave processes such as pressurization and demolding is overcome, and in addition, the RFI liquid forming process also relates to a plurality of problems such as resin flow control.
An annular structure is formed by enclosing the hat-shaped ribs and the skin of the hat-shaped reinforced wall plate, resin flows at the root parts of the hat-shaped ribs in the traditional RFI process, the resin flows to the hat top along two side layers of the hat-shaped ribs, and dry spots are easily generated at the hat top and the hat bottom to cause part scrap, as shown in figure 1. How to control the resin flow of the hat-shaped reinforced wall plate in the RFI technological process so that the resin completely soaks dry fibers to avoid dry spots is a key technology for integrally forming the RFI of the hat-shaped reinforced wall plate.
Disclosure of Invention
The invention aims to provide a resin flow control method for integrally forming RFI of a hat-shaped reinforced wall plate, aiming at the problem that dry spots are easy to appear in the prior art, and the RFI of the high-quality hat-shaped reinforced wall plate is integrally formed.
The invention considers the structural characteristics of the hat-shaped reinforced wall plate and the resin flow characteristics of the RFI process, decomposes the hat-shaped reinforced wall plate into two structural units of an annular structure and a plate-shaped structure, establishes a resin flow model simultaneously suitable for controlling the resin flow of the annular structure and the plate-shaped structure, forms the RFI integral molding resin flow model of the hat-shaped reinforced wall plate, carries out resin laying and air path arrangement according to the established resin flow model, guides the resin flow in the RFI process, and realizes the complete infiltration of the resin to the preformed body of the hat-shaped reinforced wall plate.
The invention provides a resin flow control method for integrally forming a hat-shaped reinforced wall plate RFI, which comprises the following steps:
s1, decomposing the hat-shaped reinforced wall plate into two structural units of an annular structure and a plate-shaped structure;
s2, establishing a resin flow control model suitable for the annular structure and the plate-shaped structure;
s3, resin film laying and air path setting are carried out according to the resin flow control model;
and S4, overlapping to form an air path and executing an RFI process to guide resin to flow, so that the resin can completely infiltrate the preformed body of the hat-shaped reinforced wall plate.
Further, in step S1, the annular structure is formed by the side wall of the hat-shaped stiffener, the crown, and the skin corresponding to the bottom of the cavity of the hat-shaped stiffener, and the plate-shaped structure is formed by the downward flange of the hat-shaped stiffener and the skin in other areas.
Further, in step S2, a first resin flow control model is respectively established for the annular structure and the plate-shaped structure, wherein the resin flow direction for the annular structure is from inside to outside, and the resin flow direction for the plate-shaped structure is consistent with the resin flow direction of the annular structure on the skin side.
Further, in step S2, a second resin flow control model is respectively established for the annular structure and the plate-shaped structure, wherein the resin flow direction for the annular structure is from outside to inside, and the resin flow direction for the plate-shaped structure is consistent with the resin flow direction of the annular structure on the skin side.
Further, for the first resin flow control model, the upper profile mold is butted with the cap-shaped reinforcement at the edge; in the annular structure area, the inner side of the cap-shaped reinforcement is provided with a resin film and a cap-shaped reinforcement inner section mold, and the outer side of the cap-shaped reinforcement is sequentially provided with a cap-shaped reinforcement outer section mold, a breathable material or a semi-permeable film material and an isolation material from inside to outside; sequentially paving a resin film and an isolation material paved at the edge in the plate-shaped structure area; a plurality of through holes are uniformly distributed on the cap-shaped reinforced outer section die, and the upper profile die is provided with a plurality of through holes; on the basis of the structure, a second breathable material and a vacuum film are integrally laid; resin films are laid between adjacent layers of the multi-layer woven fabric of the skin; the outermost part of the skin is covered or completely covered with the breathable material.
Further, for the first resin flow control model, the upper profile mold is butted with the cap-shaped reinforcement at the edge; in the annular structure area, the inner side of the cap-shaped reinforcement is provided with a cap-shaped reinforcement inner section mold, resin films are arranged between adjacent layers of the multi-layer woven fabric of the cap-shaped reinforcement, and the outer side of the cap-shaped reinforcement is sequentially provided with a cap-shaped reinforcement outer section mold, a breathable material or a semi-permeable film material and an isolation material from inside to outside; sequentially paving a resin film and an isolation material paved at the edge in the plate-shaped structure area; a plurality of through holes are uniformly distributed on the cap-shaped reinforced outer section die, and the upper profile die is provided with a plurality of through holes; on the basis of the structure, a second breathable material and a vacuum film are integrally laid; resin films are laid between adjacent layers of the multi-layer woven fabric of the skin; the outermost part of the skin is covered or completely covered with the breathable material.
Further, the breathable material is laid on the outer surface of the skin or outside the theoretical edge of the skin in the peripheral allowance area.
Further, for the second resin flow control model, the upper profile mold is butted with the cap-shaped reinforcement at the edge; in the annular structure area, the inner side of the cap-shaped reinforcement is sequentially provided with a first air-permeable material and a cap-shaped reinforcement inner section die from outside to inside, and the outer side of the cap-shaped reinforcement is sequentially provided with a cap-shaped reinforcement outer section die, a resin film and an isolation material or a semi-permeable membrane material from inside to outside; a third breathable material or semi-permeable membrane material and an isolation material are sequentially paved in the plate-shaped structure area; a second breathable material and a vacuum film are integrally laid on the basis of the laying layer; a plurality of through holes are uniformly distributed on the cap-shaped reinforced outer section die, and the upper profile die is provided with a plurality of through holes; a resin film is laid between adjacent layers of the multi-layer woven fabric having the entire outer side of the skin or the skin laid thereon.
Further, for the second resin flow control model, the upper profile mold is butted with the cap-shaped reinforcement at the edge; in the annular structure area, the inner side of the cap-shaped reinforcement is sequentially provided with a first air-permeable material and a cap-shaped reinforcement inner section die from outside to inside, the outer side of the cap-shaped reinforcement is sequentially provided with a cap-shaped reinforcement outer section die and an isolation material or semi-permeable membrane material from inside to outside, wherein the cap-shaped reinforcement is a multi-layer fiber woven fabric, and resin membranes are laid between adjacent layers; a third breathable material or semi-permeable membrane material and an isolation material are sequentially paved in the plate-shaped structure area; a second breathable material and a vacuum film are integrally laid on the basis of the laying layer; a plurality of through holes are uniformly distributed on the cap-shaped reinforced outer section die, and the upper profile die is provided with a plurality of through holes; a resin film is laid between adjacent layers of the multi-layer woven fabric having the entire outer side of the skin or the skin laid thereon.
The invention has the advantages that:
the resin flow model of the hat-shaped reinforced wall plate overcomes the phenomenon that resin flows at the root part of the hat-shaped reinforced wall plate in the traditional RFI process method, avoids dry spots generated by resin flow division of the hat-shaped reinforced wall plate, and provides necessary conditions for the integral forming of the hat-shaped reinforced wall plate by the RFI.
2, providing an air path setting method matched with a cap-shaped reinforced wall plate resin flow model, setting an air path by combining a mold structure, and guiding resin flow by adopting a ventilating material and an isolating material in a subarea in the assembling process of a preformed body and a mold to realize the infiltration of resin to dry fibers.
3 the built resin flow model of the hat-shaped reinforced wall plate and the matched air path setting method not only realize the RFI molding of the hat-shaped reinforced wall plate, but also shorten the time for the resin to permeate the preformed body and improve the molding efficiency
4, calculating through the adopted materials, guiding and formulating a resin film laying scheme of the hat-shaped reinforced wall plate, and selecting a more proper resin flow control model to realize the integral molding of the RFI of the high-quality hat-shaped reinforced wall plate.
Drawings
FIG. 1 is a schematic diagram of resin flow in a conventional RFI process hat stiffened wall panel;
FIG. 2 is an exploded view of the hat stiffened panel of the present invention;
FIG. 3 is a schematic diagram of two resin flow models for the hat stiffened panel RFI process;
fig. 4 is a schematic diagram of the placement of the RFI process resin film;
FIG. 5 is a schematic diagram showing the resin film placement and gas path arrangement of a first resin flow control model;
fig. 6 is a schematic diagram showing resin film placement and gas path arrangement of the second resin flow control model.
Detailed Description
The present invention is described in further detail below.
The hat stiffened panel is composed of a plurality of hat stiffeners 9 and a skin 10, and is structurally decomposed for resin flow control of the hat stiffened panel. The two sides of the cap-shaped reinforcement, the cap top and the skin at the bottom of the cavity of the cap-shaped reinforcement are used as an annular structure 1, and the downward flanging of the cap-shaped reinforcement and the skin outside the cavity of the cap-shaped reinforcement form a plate-shaped structure 2, as shown in figure 2.
When a resin flow model suitable for molding the hat-shaped stiffened wall panel RFI is established, the resin flow models are respectively established for the annular structure 1 and the plate-shaped structure 2. Resin flow directions a3 and b5 for the annular structure 1 control resin flow in two directions, the resin flow in direction a3 from the inside out and the resin flow in direction b5 from the outside in. The resin flow direction of the plate-shaped structure 2 is consistent with the resin flow direction of the skin at the bottom of the hat-shaped reinforcement cavity of the annular structure 1. The flow direction c4 of the skin resin corresponding to the direction a3 is from top to bottom, the direction a3+ the direction c4 are combined to form a first resin flow control model 7 of the hat stiffened wall, and the flow model d6 of the skin resin corresponding to the direction b5 is from bottom to top, and the flow control model b5+ d6 is combined to form a second resin flow control model 8 of the hat stiffened wall, as shown in fig. 3.
(1) The resin film laying positions of the hat-shaped reinforced wall plate are different according to different resin flow models.
a. When the first resin flow control model 7 is used:
the resin films 11 of the annular structure 1 are intensively laid and sealed between the inner side of the cavity of the annular structure 1 and the cap-shaped reinforced inner section mould 15 or are laid between the annular structure 1 layer by layer in the process of preparing the cap-shaped reinforced wall plate preform.
The resin film 11 of the plate-shaped structure 2 can be paved layer by layer between all areas or partial areas of the plate-shaped structure 2 in the process of preparing the cap-shaped reinforced wallboard preform, or intensively paved and sealed in all areas outside the upper profile mold 14 or the areas without the interlayer resin film among the layers of the plate-shaped structure 2 according to different process requirements of each area of the plate-shaped structure. The boundary of the area where the resin films are intensively laid is generally larger than the boundary of the area where the resin films are not laid between the layers of the plate-shaped structure 2, the allowable deviation is +25mm to-5 mm, and the molded surface die 14 on the area 5mm to 15mm away from the edge of the area where the resin films are intensively laid needs to be provided with through holes with the diameter of not more than phi 2.0mm at the distance of 10mm to 25 mm.
b. When the second resin flow control model 8 is used:
the resin films 11 of the annular structure 1 are paved among the annular structure 1 layers or intensively paved and sealed in the outer side area of the cap-shaped reinforced outer mould 13 layer by layer in the process of preparing the cap-shaped reinforced wallboard preforming body. The cap-shaped reinforcement outer die 13 needs to be provided with through holes with the edge distance of 5 mm-20 mm, the distance of 10 mm-25 mm and the diameter of less than phi 2.0 mm. The resin film required by the bottom skin of the hat-shaped reinforcement cavity is laid together with the resin film of the plate-shaped structure 2.
The resin films 11 of the plate-shaped structure 2 are laid layer by layer between the whole area or partial area of the plate-shaped structure 2 in the process of preparing the preformed body of the hat-shaped stiffened wall plate, or are intensively laid and sealed between the outer mould 12 of the wall plate and the outer surface of the hat-shaped stiffened wall plate.
(2) Air path arrangement of cap-shaped reinforced wall plate RFI forming process
Aiming at different resin flow models and resin laying modes, the positions of air passages and the adopted materials are different, the air passages are arranged by combining a mold structure, and the air-permeable material and the glue-impermeable isolating material are adopted in the divided areas in the process of assembling the cap-shaped ribbed wallboard preform and the mold to guide the resin to flow so as to realize the infiltration of the resin on dry fibers.
a. When the first resin flow control model 7 is adopted, 50-150 mm of distance between the top middle positions of the cap-shaped reinforcement outer die 13 is drilled with 1 row of through holes with the diameter not more than phi 2.0mm, the outer surface of the cap-shaped reinforcement forming die is paved with air-permeable materials 16 with the width not less than 120mm, and the air-permeable materials are centrally paved according to the axis of the cap-shaped reinforcement. The air permeable material 16 can be selected from polytetrafluoroethylene cloth, EW100 or EW200 glass cloth, adhesive absorption felt, semi-permeable membrane and other materials with air permeable function. When the air permeable material 16 adopts a semi-permeable membrane, the outer surface does not need to be paved with the isolation material 18, and when the rest materials are polytetrafluoroethylene cloth, EW100 or EW200 glass cloth and glue absorption felt, the isolation material 18 needs to be paved outside, the width is not less than 100mm, and the width is smaller than the single side of the air permeable material by more than 5 mm. The isolating material 18 may be selected from a gas-impermeable a4000 film, a vacuum film. And (3) laying the breathable material 17 outside the theoretical edge of the skin of the outer surface or peripheral allowance area of the skin 10, wherein the outline is wider than the edge single side of the skin preforming body by more than 60 mm. The air-permeable material 17 can be selected from polytetrafluoroethylene cloth, EW100 or EW200 glass cloth and other materials which have the air-permeable function and do not affect the flatness of the profile. The air-permeable material 17 is paved with the isolation material 19 on the peripheral area of the preforming body, the outline of the isolation material 19 is larger than the single edge of the peripheral edge of the skin of the preforming body by more than 50mm, smaller than the single edge of the air-permeable material 17 by more than 5mm, and smaller than the peripheral edge of the skin of the inner outline by more than 50 mm. The separating material 19 may be selected from a gas-impermeable a4000 film, a vacuum film, or a gas-permeable and glue-impermeable semi-permeable film.
b. When the second resin flow control model 8 is adopted, a first air permeable material 20 is laid between the inner surface of the hat-shaped reinforcement and the inner section mould 15 of the hat-shaped reinforcement, and the two ends of the first air permeable material are longer than one side of the end edge of the hat-shaped reinforcement by more than 60 mm. The first gas permeable material 20 can be selected from teflon cloth, EW100 or EW200 glass cloth. The isolation materials 22 on the outer sides are laid at two ends of the hat-shaped reinforcement, the outer edge of each isolation material is larger than the single edge of the end edge of the hat-shaped reinforcement by more than 50mm, the outer edge of each isolation material is smaller than the single edge of the first air-permeable material 20 by more than 5mm, and the inner edge of each isolation material is longer than the length of the end edge of the hat-shaped reinforcement. The separator material 22 may be selected from a gas impermeable a4000 film, a vacuum film, or a gas permeable, glue impermeable semi-permeable film. And (3) drilling through holes with the diameter not more than phi 2.0mm at the interval of 200-300 mm on the upper molding surface mould 14, and paving a third breathable material 21 on the whole area or part of the upper surface of the upper molding surface mould 14 to the periphery to form a passage, wherein the outline is wider than the single side of the peripheral edge of the skin by more than 60 mm. The third air permeable material 21 can be selected from teflon cloth, EW100 or EW200 glass cloth, adhesive absorption felt, semi-permeable membrane and other materials with air permeable function. When the air-permeable material 21 adopts a semi-permeable membrane, the outer surface does not need to be paved with the isolation material 23, and when the rest materials are polytetrafluoroethylene cloth, EW100 or EW200 glass cloth and glue-absorbing felt, the isolation material 23 needs to be paved outside, and the outline of the isolation material 23 is larger than the single edge of the periphery edge of the skin of the preformed body by more than 50mm and smaller than the single edge of the third air-permeable material 21 by more than 5 mm. The isolating material 23 may be selected from a gas-impermeable a4000 film and a vacuum film.
(3) After the operations are completed, the second air-permeable material 24 is laid in a full-covering mode, overlapped with the hat-shaped reinforcement and the air-permeable material on the periphery of the skin to form an air path, and the vacuum film 25 is packaged by the sealing rubber strip 26. And transferring and curing the resin according to the resin process specification.
In order to realize the application of the RFI forming hat-shaped reinforced wall plate on the airplane structure, a large number of process tests are carried out on the hat-shaped reinforced wall plate structure. In view of the fact that dry spots are generated at the top and the bottom of the hat-shaped reinforced wall plate by the traditional resin flow control method, the resin flow model is improved by analyzing the structural characteristics of the hat-shaped reinforced wall plate, the technical scheme is adopted, the hat-shaped reinforced wall plate is formed by RFI, the large-size and high-quality hat-shaped reinforced integral wall plate can be formed by three-dimensional reinforcement technologies such as structural sewing and weaving through the RFI technology, the formed wall plate is good in structural quality and stable in technology, and the method is successfully applied at present.
Example 1: a test piece of a hat stiffened panel having a size of 1.5m x 0.7m is provided with 2 hat stiffeners 9 having the same length as the skin 10, and the hat stiffener turndown is sewn to the skin 10 and then molded by an RFI process. The cap-shaped composite material reinforced wall plate test piece is prepared by the scheme, and the specific operation method is as follows:
a. partitioning of hat stiffened wall panel structural units
In order to realize the resin flow control of the hat-shaped stiffened wall panel, the structure of the hat-shaped stiffened wall panel is decomposed. The two side walls of the cap-shaped reinforcement, the cap top and the skin at the bottom of the cap-shaped reinforcement cavity are used as an annular structure 1, and the lower flange of the cap-shaped reinforcement and the skin outside the cap-shaped reinforcement cavity form a plate-shaped structure 2.
b. Selecting resin flow model suitable for forming hat-shaped reinforced wall plate RFI
And selecting the second resin flow control model 8 of the hat-shaped reinforced wall plate, wherein the annular structure 1 flows the resin from outside to inside in the direction b5, and the plate-shaped structure 2 flows from bottom to top in the direction d 6.
c. Resin film laying position of hat-shaped reinforced wall board
The test piece adopts a second resin flow control model 8, resin films 11 required by the top and two sides of the cap-shaped reinforcement of the annular structure 1 are intensively paved and sealed in the outer side area of a cap-shaped reinforcement outer die 13, and the cap-shaped reinforcement outer die 13 needs to be provided with through holes with the edge distance of 5-20 mm, the distance of 10-25 mm and the diameter of no more than phi 2.0 mm. The resin film required by the bottom skin of the hat-shaped reinforcement cavity is laid together with the resin film of the plate-shaped structure 2.
The resin film 11 of the plate-shaped structure 2 is collectively laid and sealed between the panel outer mold 12 and the outer surface of the hat-shaped stiffened panel.
d. Air path arrangement of cap-shaped reinforced wall plate RFI forming process
A first air permeable material 20 is laid between the inner surface of the hat-shaped reinforcement and the inner section mould 15 of the hat-shaped reinforcement, and both ends of the first air permeable material are longer than one side of the end edge of the hat-shaped reinforcement by about 100 mm. The first breathable material 20 is selected from teflon cloth. The two ends of the hat-shaped reinforcement are laid with the isolation materials 22, the outer edge is about 80mm longer than the single edge of the end edge of the hat-shaped reinforcement and about 20mm shorter than the single edge of the first air-permeable material 20, and the inner edge is about 80mm longer than the end edge of the hat-shaped reinforcement. The barrier material 22 is selected to be an a4000 film that is impermeable to air. The upper molding surface die 14 is spaced by 200mm and provided with through holes with the diameter phi of 2.0mm, the upper surface of the upper molding surface die 14 is paved with a third breathable material 21 in the whole area, and the outline is about 80mm wider than the single side of the peripheral edge of the skin. The third gas permeable material 21 is selected from EW100 glass cloth. And (3) laying an isolating material 23 outside the third breathable material 21, wherein the outline of the isolating material 23 is about 70mm smaller than one side of the peripheral edge of the skin of the preformed body and about 10mm smaller than one side of the third breathable material 21. The barrier material 23 is selected to be an a4000 film that is impermeable to air.
e. After the above operations are completed, the glue absorption felt is laid in a full-covering mode to serve as a second breathable material 24, the second breathable material is overlapped with the hat-shaped reinforcement and the breathable material on the periphery of the skin to form an air path, and the vacuum film 25 is packaged by the sealing rubber strips 26, as shown in fig. 5. And transferring and curing the resin according to the resin process specification.
Example 2: the hat-shaped ribbed wall plate with the size of 6.0m multiplied by 0.9m is provided with 4 hat-shaped ribs 9 with the length of 4.5m, two ends and the periphery of a skin 10 are sewed, and the lower flanging of the hat-shaped ribs is sewed with the skin and is formed by an RFI process. The cap-shaped composite material reinforced wall plate is prepared by adopting the scheme, and the specific operation method is as follows:
a. partitioning of hat stiffened wall panel structural units
In order to realize the resin flow control of the hat-shaped stiffened wall panel, the structure of the hat-shaped stiffened wall panel is decomposed. The two sides of the cap-shaped reinforcement, the cap top and the skin at the bottom of the cap-shaped reinforcement cavity are used as an annular structure 1, and the lower flange of the cap-shaped reinforcement and the skin outside the cap-shaped reinforcement cavity form a plate-shaped structure 2.
b. Selecting resin flow model suitable for forming hat-shaped reinforced wall plate RFI
The first resin flow control model 7 of the hat-shaped stiffened wall panel is selected, the annular structure 1 flows resin from inside to outside in the direction a3, and the plate-shaped structure 2 flows from top to bottom in the direction c 4.
c. Resin film laying position of hat-shaped reinforced wall board
The wall plate adopts a first resin flow control model 7, and resin films 11 of the annular structure 1 are laid between layers layer by layer in the process of preparing the preformed body.
The resin film 11 of the plate-shaped structure 2 is intensively laid and sealed in the corresponding area outside the upper molded surface die 14 in the sewing areas at the two ends of the skin and the hat-shaped reinforced flanging sewing areas, the boundary of the area where the resin film is intensively laid is larger than the boundary of the area where the resin film is not laid between the layers of the plate-shaped structure 2, the single edge is increased by 10mm, and the upper molded surface die 14 is 5mm away from the edge of the area where the resin film is intensively laid and needs to be provided with through holes with the distance of 15 mm. The resin film 11 in the remaining areas is layered between the layers of these areas during the preform preparation.
d. Air path arrangement of cap-shaped reinforced wall plate RFI forming process
The wall plate adopts a first resin flow control model 7, 1 row of through holes with the diameter exceeding phi 2.0mm are drilled at the middle position of the top of a cap-shaped reinforcement outer die 13 at the interval of 100mm, an air-permeable material 16 is paved on the outer surface of the cap-shaped reinforcement outer die, the width of the air-permeable material is not less than 140mm, and the air-permeable material is paved in the middle according to the axis of the cap-shaped reinforcement. The air permeable material 16 is made of an adhesive absorption felt, and the isolating material 18 is laid outside the air permeable material 16, has the width not less than 120mm and is about 10mm smaller than the single side of the air permeable material. The barrier material 18 is selected to be an a4000 film that is impermeable to air. Between the outer surface of the wallboard skin and the wallboard outer mould 12, and outside the theoretical edge of the skin, a breathable material 17 is laid, and the outline is about 90mm wider than the edge single side of the skin preform. The breathable material 17 is selected from EW100 glass cloth. The air-permeable material 17 is laid with the isolation material 19 on the peripheral area of the preform body, the outline of the isolation material 19 is about 60mm smaller than the single edge of the peripheral edge of the skin preform body, and is 30mm smaller than the single edge of the air-permeable material 17, and the peripheral edge of the inner contour skin is about 60mm smaller. The barrier material 19 is selected to be an a4000 film that is impermeable to air.
e. After the above operations are completed, the air-permeable felt is laid in a full-covering mode, overlapped with the hat-shaped reinforcement and the air-permeable material on the periphery of the skin to form an air path, the vacuum film (25) is packaged by the sealing rubber strip 26, and resin transfer and curing are carried out according to the resin process specification as shown in fig. 6.
Claims (9)
1. A resin flow control method of integral molding of a hat-shaped stiffened wall RFI, comprising the steps of:
s1, decomposing the hat-shaped reinforced wall plate into two structural units, namely an annular structure (1) and a plate-shaped structure (2);
s2, establishing a resin flow control model suitable for the annular structure (1) and the plate-shaped structure (2);
s3, resin film laying and air path setting are carried out according to the resin flow control model;
and S4, overlapping to form an air path and executing an RFI process to guide resin to flow, so that the resin can completely infiltrate the preformed body of the hat-shaped reinforced wall plate.
2. The resin flow control method according to claim 1, characterized in that: in step S1, the annular structure (1) is formed by the side wall of the hat-shaped stiffener, the crown, and the skin (10) corresponding to the bottom of the cavity of the hat-shaped stiffener (9), and the plate-shaped structure (2) is formed by the skin (10) of the hat-shaped stiffener turndown and other areas.
3. The resin flow control method according to claim 2, characterized in that: in step S2, a first resin flow control model (7) is established for the annular structure (1) and the plate-shaped structure (2), respectively, wherein the resin flow direction for the annular structure (1) is from inside to outside, and the resin flow direction for the plate-shaped structure (2) is consistent with the resin flow direction of the annular structure (1) on the skin side.
4. The resin flow control method according to claim 2, characterized in that: in step S2, a second resin flow control model (8) is respectively established for the annular structure (1) and the plate-shaped structure (2), wherein the resin flow direction suitable for the annular structure (1) is from outside to inside, and the resin flow direction suitable for the plate-shaped structure (2) is consistent with the resin flow direction of the annular structure (1) on the skin side.
5. The resin flow control method according to claim 3, characterized in that: for the first resin flow control model (7), an upper profile mold (14) is butted with the cap-shaped reinforcement (9) at the edge; in the area of the annular structure (1), the inner side of the cap-shaped reinforcement (9) is provided with a resin film (11) and a cap-shaped reinforcement inner-forming die (15), and the outer side of the cap-shaped reinforcement (9) is sequentially provided with a cap-shaped reinforcement outer-forming die (13), a breathable material (16) or a semi-permeable film material and an isolation material (18) from inside to outside; in the area of the plate-shaped structure (2), a resin film (11) and an isolation material (19) coated on the edge are sequentially paved; a plurality of through holes are uniformly distributed in the cap-shaped reinforced outer section die (13), and the upper section die (14) is provided with a plurality of through holes; on the basis of the structure, a second air-permeable material (24) and a vacuum film (25) are integrally laid; a resin film (11) is laid between adjacent layers of the multi-layer woven fabric of the skin (10); the outermost part of the skin (10) is covered or completely covered with a breathable material (17).
6. The resin flow control method according to claim 3, characterized in that: for the first resin flow control model (7), an upper profile mold (14) is butted with the cap-shaped reinforcement (9) at the edge; in the area of the annular structure (1), a hat-shaped reinforcement inner die (15) is arranged on the inner side of the hat-shaped reinforcement (9), a resin film (11) is arranged between adjacent layers of the multi-layer woven fabric of the hat-shaped reinforcement (9), and a hat-shaped reinforcement outer die (13), a breathable material (16) or a semi-permeable film material and a separation material (18) are sequentially arranged on the outer side of the hat-shaped reinforcement (9) from inside to outside; in the area of the plate-shaped structure (2), a resin film (11) and an isolation material (19) coated on the edge are sequentially paved; a plurality of through holes are uniformly distributed in the cap-shaped reinforced outer section die (13), and the upper section die (14) is provided with a plurality of through holes; on the basis of the structure, a second air-permeable material (24) and a vacuum film (25) are integrally laid; a resin film (11) is laid between adjacent layers of the multi-layer woven fabric of the skin (10); the outermost part of the skin (10) is covered or completely covered with a breathable material (17).
7. The resin flow control method according to claim 5 or 6, characterized in that: and laying the breathable material (17) on the outer surface of the skin (10) or outside the theoretical edge of the skin in the peripheral allowance area.
8. The resin flow control method according to claim 4, characterized in that: for the second resin flow control model (8), the upper profile mold (14) is butted with the cap-shaped reinforcement (9) at the edge; in the area of the annular structure (1), the inner side of the cap-shaped reinforcement (9) is sequentially provided with a first air-permeable material (20) and a cap-shaped reinforcement inner-type die (15) from outside to inside, and the outer side of the cap-shaped reinforcement (9) is sequentially provided with a cap-shaped reinforcement outer-type die (13), a resin film (11) and a separation material (22) or a semi-permeable membrane material from inside to outside; in the area of the plate-shaped structure (2), a third air-permeable material (21) or a semi-permeable membrane material and a separation material (23) are laid in sequence; a second air-permeable material (24) and a vacuum film (25) are integrally laid on the basis of the above laying layers; a plurality of through holes are uniformly distributed in the cap-shaped reinforced outer section die (13), and the upper section die (14) is provided with a plurality of through holes; a resin film (11) is laid on the outer side of the whole skin (10) or a resin film (11) is laid between adjacent layers of the multi-layer woven fabric of the skin (10).
9. The resin flow control method according to claim 4, characterized in that: for the second resin flow control model (8), the upper profile mold (14) is butted with the cap-shaped reinforcement (9) at the edge; in the area of the annular structure (1), a first air-permeable material (20) and a cap-shaped reinforcement inner-forming die (15) are sequentially arranged on the inner side of a cap-shaped reinforcement (9) from outside to inside, a cap-shaped reinforcement outer-forming die (13) and an isolation material (22) or a semipermeable membrane material are sequentially arranged on the outer side of the cap-shaped reinforcement (9) from inside to outside, the cap-shaped reinforcement (9) is a multi-layer fiber woven fabric, and resin films (11) are laid between adjacent layers; a third air-permeable material (21) or a semi-permeable membrane material and an isolation material (23) are sequentially paved in the area of the plate-shaped structure (2); a second air-permeable material (24) and a vacuum film (25) are integrally laid on the basis of the above laying layers; a plurality of through holes are uniformly distributed in the cap-shaped reinforced outer section die (13), and the upper section die (14) is provided with a plurality of through holes; a resin film (11) is laid on the outer side of the whole skin (10) or a resin film (11) is laid between adjacent layers of the multi-layer woven fabric of the skin (10).
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| CN111152479A (en) * | 2019-12-19 | 2020-05-15 | 中国航空制造技术研究院 | Resin flow control method for integral forming of hat-shaped reinforced wall plate RFI |
| CN112454948A (en) * | 2020-10-22 | 2021-03-09 | 中国航空制造技术研究院 | Method for determining preset mode of RFI (radio frequency Integrated Circuit) process resin film |
| CN113524722A (en) * | 2021-07-27 | 2021-10-22 | 中航西安飞机工业集团股份有限公司 | Composite material hat-shaped reinforced wall plate VARI forming resin flow infiltration device and method |
| CN113733601A (en) * | 2021-08-24 | 2021-12-03 | 成都飞机工业（集团）有限责任公司 | Flow guiding method for VARI liquid forming composite material reinforced wall plate |
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