CN111823449A - Soft mold for precisely manufacturing inverted V-shaped composite material part - Google Patents
Soft mold for precisely manufacturing inverted V-shaped composite material part Download PDFInfo
- Publication number
- CN111823449A CN111823449A CN202010477881.1A CN202010477881A CN111823449A CN 111823449 A CN111823449 A CN 111823449A CN 202010477881 A CN202010477881 A CN 202010477881A CN 111823449 A CN111823449 A CN 111823449A
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- Prior art keywords
- air guide
- protective layer
- flexible protective
- soft
- pressure transmission
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
- B29C33/405—Elastomers, e.g. rubber
-
- 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
- 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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- 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
- B29L2031/3097—Cosmonautical vehicles; Rockets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a soft mold for accurately manufacturing an inverted V-shaped composite part, which comprises a first flexible protective layer attached to the surface of the inverted V-shaped composite part, wherein a rigid reinforcing layer covers the upper part of the first flexible protective layer, and a second flexible protective layer covers the surface of the rigid reinforcing layer; the flexible membrane is also provided with a plurality of air guide pressure transmission holes penetrating through the first flexible protective layer, the rigid reinforcing layer and the second flexible protective layer, the diameter of each air guide pressure transmission hole is 2-3 mm, and the distance between every two adjacent air guide pressure transmission holes is 20-100 mm. According to the invention, the novel soft film is provided, so that the soft film is tightly attached to the part blank in the part curing process, and the pressure in the composite material part forming process is effectively transmitted to the surface of the part, thereby avoiding the defects of internal gaps, layering and the like of the composite material part.
Description
Technical Field
The invention relates to the technical field of vacuum bag/autoclave molding, in particular to a soft mold for precisely manufacturing inverted V-shaped composite material parts.
Background
The vacuum bag/autoclave forming technology is one of the most widely used forming technologies for manufacturing composite material parts in the aerospace field, the process method has the advantages of wide application range, relatively simple mould, high efficiency, suitability for forming skin, wall plates and shells with large-area complex profiles, and relatively stable and reliable forming process, so that most composite material components requiring high bearing in the aerospace field adopt the autoclave forming process so far. However, for parts with smooth surface and narrow internal space, such as pipes, round pipes, square pipes, and Λ -shaped members, the composite material parts manufactured by the conventional vacuum bag/autoclave molding process have poor surface quality and cannot meet the use requirements. The surface quality problem not only affects the smooth finish of the part appearance, but also affects the external dimension of the part and the mechanical equipment capability, therefore, in order to solve the difficulty, a mold form of matching a metal male mold and a soft mold is adopted in the part forming process. The rigid metal male die is used for ensuring the basic configuration and the surface quality of the film-sticking surface of the part, and the soft die is used for ensuring the surface quality of the non-film-sticking surface (outer surface) of the part, so that the composite material part with a flat and smooth surface is prepared. However, with the requirements for structural reliability and manufacturing precision of composite parts becoming higher and higher, the relative position between the soft mold and the part blank cannot be ensured in the structure of a common metal mold and the soft mold, and the soft mold and the part blank cannot be attached to each other in the process of curing the part, so that the pressure cannot be effectively transmitted to the surface of the part in the process of forming the composite part, and the defects of internal gaps, delamination and the like of the composite part are caused.
Disclosure of Invention
The invention aims to provide a soft mold for accurately manufacturing an inverted V-shaped composite part, which solves the problems that the soft mold is not accurately positioned and pressure cannot be effectively transmitted to the surface of the part in the molding process of the composite part.
The invention is realized by the following technical scheme: a soft mold for accurately manufacturing an inverted V-shaped composite part comprises a first flexible protective layer attached to the surface of the inverted V-shaped composite part, wherein a rigid reinforcing layer covers the upper part of the first flexible protective layer, and a second flexible protective layer covers the surface of the rigid reinforcing layer; the flexible membrane is also provided with a plurality of air guide pressure transmission holes penetrating through the first flexible protective layer, the rigid reinforcing layer and the second flexible protective layer, the diameter of each air guide pressure transmission hole is 2-3 mm, and the distance between every two adjacent air guide pressure transmission holes is 20-100 mm.
The working principle of the technical scheme is that the rigid reinforcing layer is tightly coated by the first flexible protective layer and the second flexible protective layer, the flexible protective layer and the rigid reinforcing layer are completely attached, the phenomena of bubble swelling and the like do not exist, and the protective layer is smooth and has no wrinkles. Solidifying and forming under the action of certain temperature and pressure, and drilling a gas-guiding pressure-transmitting hole on the soft die body according to the structure of the part after demoulding. Through drilling the hole on the soft mould body, can effectively discharge the gas between combined material blank and soft mould, make soft mould and combined material part laminate more to effectively transmit pressure to the part surface, guarantee combined material's appearance precision and internal quality.
In order to better realize the soft membrane of the invention, further, the distance between the air guide pressure transmission holes is arranged differently according to the bending degree alpha of the reversed V-shaped composite material part,
when the alpha is less than or equal to 30 degrees, the distance between the adjacent air guide pressure transmission holes is 25 mm;
when alpha is more than 30 degrees and less than or equal to 60 degrees, the distance between the adjacent air guide pressure transmission holes is 50 mm;
when alpha is more than 60 degrees, the distance between the adjacent air guide pressure transmission holes is 100 mm.
In order to better realize the soft film, the end part of the soft film is also provided with a pin positioning hole, and the diameter of the pin positioning hole is 6 mm.
In order to better realize the soft film of the invention, the first flexible protective layer and the second flexible protective layer are made of the same material and have the same thickness, the material is rubber, and the thickness is 0.5-5 mm.
In order to better realize the soft film, the rigid reinforcing layer is formed by 2-6 layers of fabric prepreg, and the thickness of the fabric prepreg is 0.1-0.5 mm.
To better realize the flexible film of the invention, the fabric prepreg further has a cross section in the directions of 0 degrees and 90 degrees.
To better realize the flexible membrane of the present invention, further,
compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, the novel soft film is provided, so that the soft film is tightly attached to the part blank in the part curing process, and the pressure in the composite material part forming process is effectively transmitted to the surface of the part, thereby avoiding the defects of internal gaps, layering and the like of the composite material part;
(2) the novel soft film provided by the invention has smooth surface after being cured and molded, does not react with fiber, fabric, resin and the like, and is beneficial to molding and recycling of the soft film;
(3) according to the invention, through drilling the holes on the soft die, the gas between the composite material blank and the soft die can be effectively discharged, so that the soft die is more attached to the composite material part, the pressure is effectively transmitted to the surface of the part, and the appearance precision and the internal quality of the composite material are ensured;
(4) according to the invention, the positioning pin holes at the end parts of the soft die and the positioning pin grooves on the forming die are in one-to-one correspondence, so that the soft die can be accurately positioned on the composite material forming die, and the matching degree of the soft die and a blank in the part forming process and the shape accuracy of the part after forming are ensured.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic cross-sectional view of a soft mold for precision fabrication of a composite part of the type "Λ" in the present invention;
FIG. 2 is a cross-sectional view of a typical structure of an inverted V-shaped composite part according to the present invention;
fig. 3 is a structure diagram of the positioning of the soft mold for the precise manufacturing of the Λ -shaped composite material part in the invention.
Wherein: the manufacturing method comprises the following steps of 1, a first flexible protective layer, 2, a rigid reinforcing layer, 3, a first flexible protective layer, 4, an air guide pressure transmission hole, 5, a pin positioning hole, 6, a part and 7, and a tooling die body.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the definitions of "first" and "second" are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly including one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the main structure of this embodiment, as shown in fig. 1, includes a first flexible protective layer 1 attached to the surface of an Λ -shaped composite material part, a rigid reinforcing layer 2 covers the upper portion of the first flexible protective layer 2, and a second flexible protective layer 3 covers the surface 2 of the rigid reinforcing layer; the mantle still is provided with a plurality of air guide pressure transmission holes 4 that run through first flexible protective layer 1, rigid reinforcement layer 2, flexible protective layer 3 of second, the diameter that the air guide passed pressure hole 4 is 2~3mm, and the interval between the adjacent air guide pressure transmission hole 4 is 20~100 mm.
In the specific implementation mode, the typical structure of the Λ -shaped composite part is shown in fig. 2, and a mold is usually placed on the outer surface of a composite part blank and is matched with a composite material forming mold to prepare the composite material.
The composite material prepared by the soft mold can obviously improve the surface quality and the appearance precision of the composite material, and can effectively reduce the internal defects of the composite material, such as gaps, layering and the like.
Example 2:
the present embodiment is based on the above-mentioned embodiments, and further comprises air guide pressure transmission holes 4, wherein the distance between the air guide pressure transmission holes 4 is set differently according to the bending degree alpha of the Λ -shaped composite material part,
when the alpha is less than or equal to 30 degrees, the distance between the adjacent air guide pressure transmission holes 4 is 25 mm;
when alpha is more than 30 degrees and less than or equal to 60 degrees, the distance between the adjacent air guide pressure transmission holes 4 is 50 mm;
when alpha is more than 60 degrees, the distance between the adjacent air guide pressure transmission holes 4 is 100 mm.
The size of the hole spacing of the air guide pressure transfer holes 4 is determined according to the structure of the part and the complexity of the molded surface.
Example 3:
in this embodiment, on the basis of the above embodiment, a pin positioning pin 5 is further provided, as shown in fig. 3, a pin positioning hole 5 is further provided at an end of the flexible film, and a diameter of the pin positioning hole 5 is 6 mm. And a positioning pin groove corresponding to the pin positioning hole 5 is correspondingly arranged on the composite material forming die, and the pin positioning is fixed with the pin positioning hole 5 on the composite material forming die through a positioning pin. Through the one-to-one correspondence of the pin positioning holes 5 and the positioning pin grooves on the forming die, the soft die can be accurately positioned on the composite forming die, and the matching degree of the soft die and the blank in the part forming process and the shape accuracy of the formed part are ensured. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 4:
in this embodiment, on the basis of the above embodiment, the material and thickness of the first flexible protection layer 1 and the second flexible protection layer 3 are further defined, the material and thickness of the first flexible protection layer 1 and the second flexible protection layer 3 are the same, the material is rubber, and the thickness is 0.5-5 mm. The rubber has the characteristics of wear resistance, high temperature resistance, strong plasticity, extremely easy recovery and the like, and the surface is smooth after curing and molding, does not react with fibers, fabrics, resin and the like, and is beneficial to molding and recycling of a soft mold, wherein the first flexible protective layer 1 and the second flexible protective layer 3 are preferably made of rubber. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 5:
this embodiment further defines the stiffening layer 2 on the basis of the above embodiment, and the stiffening layer 2 is composed of 2-6 layers of fabric prepreg with the thickness of 0.1-0.5 mm. The fabric prepreg has the advantages of high strength, strong designability and the like, and the fabric prepreg is properly added as a reinforcing layer according to the structure of a part in the manufacturing process of the soft mold, so that the self rigidity and the forming capability of the soft mold can be improved, a composite material part is more accurate, and the rigid reinforcing layer 2 is formed by selecting a plurality of layers of fabric prepregs. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 6:
this embodiment further defines a fabric prepreg having 0 ° and 90 ° directional cross-sections on the basis of the above embodiment. After the plurality of layers of fabric prepreg in the rigid reinforcing layer are laid, the fabric prepreg is subjected to cutting treatment along the directions of 0 degree and 90 degrees respectively so as to ensure that the soft mold still has certain plasticity and self-adaptive capacity on the premise of having certain rigidity and shaping capacity, and ensure the attachment of the soft mold and the part blank. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
It is to be understood that the working principle and working process of the film structure, the pin positioning holes 5, the pins and other components according to an embodiment of the present invention are well known to those skilled in the art and will not be described in detail herein.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A soft mold for accurately manufacturing an inverted V-shaped composite part is characterized by comprising a first flexible protective layer (1) attached to the surface of the inverted V-shaped composite part, wherein a rigid reinforcing layer (2) covers the upper part of the first flexible protective layer (2), and a second flexible protective layer (3) covers the surface (2) of the rigid reinforcing layer; the flexible membrane is still provided with a plurality of air guide pressure transmission holes (4) that run through first flexible protective layer (1), rigid reinforcement layer (2), flexible protective layer of second (3), the diameter that the air guide passed pressure hole (4) is 2~3mm, and the interval between adjacent air guide pressure transmission hole (4) is 20~100 mm.
2. A soft mold for the precise manufacturing of composite parts of type 'Λ' according to claim 1, characterized in that the spacing between the air guide pressure transfer holes (4) is differently set according to the bending degree a of the composite parts of type 'Λ',
when the alpha is less than or equal to 30 degrees, the distance between the adjacent air guide pressure transmission holes (4) is 25 mm;
when alpha is more than 30 degrees and less than or equal to 60 degrees, the distance between the adjacent air guide pressure transmission holes (4) is 50 mm;
when alpha is more than 60 degrees, the distance between the adjacent air guide pressure transmission holes (4) is 100 mm.
3. A soft mold for the precise manufacturing of Λ -type composite parts according to claim 1 or 2, characterized in that the end of the soft film is further provided with a pin locating hole (5), and the diameter of the pin locating hole (5) is 6 mm.
4. A soft mould for the precise manufacturing of a composite part of the type 'A', according to claim 3, characterised in that the first flexible protection layer (1) and the second flexible protection layer (3) are made of the same material and have the same thickness, the material is rubber, and the thickness is 0.5-5 mm.
5. A soft mould for the precise manufacture of composite parts of the Λ type according to claim 1 or 2, characterized in that the stiffening layer (2) consists of 2-6 layers of fabric prepreg having a thickness of 0.1-0.5 mm.
6. A soft mold for the precise fabrication of composite parts of the type 'Λ' as claimed in claim 5, wherein the fabric prepreg has 0 ° and 90 ° directional cross sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010477881.1A CN111823449A (en) | 2020-05-29 | 2020-05-29 | Soft mold for precisely manufacturing inverted V-shaped composite material part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010477881.1A CN111823449A (en) | 2020-05-29 | 2020-05-29 | Soft mold for precisely manufacturing inverted V-shaped composite material part |
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| CN111823449A true CN111823449A (en) | 2020-10-27 |
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| CN202010477881.1A Pending CN111823449A (en) | 2020-05-29 | 2020-05-29 | Soft mold for precisely manufacturing inverted V-shaped composite material part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113715416A (en) * | 2021-06-23 | 2021-11-30 | 南京玻璃纤维研究设计院有限公司 | Fabric profiling mold |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113715416A (en) * | 2021-06-23 | 2021-11-30 | 南京玻璃纤维研究设计院有限公司 | Fabric profiling mold |
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Application publication date: 20201027 |
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