CN109130240B - Forming die and forming method for integrated copper-clad electromagnetic shielding carbon fiber product - Google Patents
Forming die and forming method for integrated copper-clad electromagnetic shielding carbon fiber product Download PDFInfo
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- CN109130240B CN109130240B CN201810868527.4A CN201810868527A CN109130240B CN 109130240 B CN109130240 B CN 109130240B CN 201810868527 A CN201810868527 A CN 201810868527A CN 109130240 B CN109130240 B CN 109130240B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—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 matched moulds
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to a forming die and a forming method of an electromagnetic shielding carbon fiber part, wherein the forming die consists of a main die, a pressing plate, a long pressing strip and a short pressing strip; the molding process comprises the following steps: cleaning a mould; pasting an adhesive tape; laying a copper net and a prepreg; molding a workpiece; demolding and post-treating. According to the invention, the red copper net and the carbon fiber prepreg are integrally formed by co-curing, so that the synchronous gluing and placing of the red copper net in the forming process of the carbon fiber part are realized, and the phenomenon that a shielding layer is easy to fall off from a matrix in the existing method is avoided; by using the combined die, the high dimensional precision requirement of the shielding layer of the carbon fiber part is realized, and the phenomena of poor plane precision and the like of the shielding layer in the existing method are avoided; the high-frequency electromagnetic shielding requirement of the carbon fiber part is met through the excellent electromagnetic shielding effectiveness of the red copper mesh and the combined adhesive isolation effect of the pressure sensitive adhesive tape, and the phenomena of poor high-frequency electromagnetic shielding effectiveness and boundary electromagnetic leakage in the existing method are avoided.
Description
Technical Field
The invention belongs to the three technical fields of machinery, materials and electromagnetism, relates to a mold design and a forming method of an electromagnetic shielding carbon fiber product integrated with copper, and can be applied to the field of military and civil products which need to meet the requirement of high dimensional precision of structures and need electromagnetic shielding.
Background
The carbon fiber composite material has the advantages of light weight, excellent mechanical property, environmental corrosion resistance and the like, and is an ideal material for manufacturing light-weight and high-strength structural members. However, the carbon fiber composite material has poor electromagnetic shielding performance, and for carbon fiber products with electromagnetic shielding performance requirements, a metal layer needs to be added to meet the electromagnetic shielding requirements.
At present, the electromagnetic shielding method of the carbon fiber product mainly comprises a plating metal layer, a glue bonding metal layer and metallization of carbon fiber tows. The metal plating layer is formed by chemically plating or coating a metal shielding layer on the shielding surface of the carbon fiber product. The gluing metal layer is formed by gluing a metal foil shielding layer on the shielding surface of the carbon fiber part by using an adhesive. The metallization of the carbon fiber tows is to plate a metal shielding layer on the surface of the carbon fiber tows firstly and then soak resin, so that the electromagnetic shielding characteristic of the carbon fiber body material is realized.
The existing carbon fiber part electromagnetic shielding method has the following defects besides high cost and heavy shielding layer quality:
(1) the surface roughness of the plating or bonding metal layer is large, the plane precision is poor, the salt spray corrosion resistance is poor, and the shielding layer is easy to fall off.
(2) The shielding uniformity and high-frequency electromagnetic shielding effectiveness of the carbon fiber tow metalized layer are poor.
A certain product carbon fiber part is of a thin-wall inner cavity flanged edge structure, high-frequency electromagnetic shielding, high dimensional precision and salt spray corrosion resistance of a shielding layer are required, and meanwhile, indexes such as low cost, light weight of the shielding layer and the like need to be met, and the design requirements cannot be met by the existing shielding method.
Disclosure of Invention
Technical problem to be solved
The invention aims to overcome the defects of the existing carbon fiber part electromagnetic shielding method, and obtains a novel carbon fiber part shielding method by utilizing the excellent high-frequency electromagnetic shielding and environmental corrosion resistance characteristics of a red copper net and ensuring the high dimensional precision of co-curing molding of the red copper net and carbon fiber prepreg, thereby meeting the index requirements of the carbon fiber part such as electromagnetic shielding, dimensional precision, salt spray corrosion resistance, low cost, light weight and the like.
Technical scheme
A forming die for an integrated copper-clad electromagnetic shielding carbon fiber finished piece is of an inner cavity flanged edge structure and is characterized by comprising a main die, a pressing plate, a long pressing strip and a short pressing strip; the main die is of a male die structure and consists of a forming surface, a boss and a working surface; bosses are arranged on the periphery of the molding surface and used for positioning the long pressing strips and the short pressing strips; the pressing plate is of a rectangular structure, and the length and the width of the pressing plate are respectively 4mm smaller than the outer surface of the cavity of the workpiece; the long pressing strip and the short pressing strip are both in a 45-degree step structure.
The length and width of the molding surface are respectively subjected to thermal compensation on the basis of the size of the inner surface of the cavity of the manufactured part, and the compensation coefficient is 1/[1+ (alpha)m-αf)ΔT)]Wherein: alpha is alpham: coefficient of thermal expansion of the mold material, unit: x 10-6/deg.C; alpha is alphac: coefficient of thermal expansion of the composite material, in units: x 10-6/deg.C; Δ T: temperature difference between prepreg curing temperature and ambient temperature, unit: DEG C.
The main die, the pressing plate, the long pressing strip and the short pressing strip are all made of 45 steel.
A forming method of an integrated copper-clad mesh electromagnetic shielding carbon fiber product is characterized by comprising the following steps:
step 1: cleaning the main die, the pressing plate, the long pressing strip and the short pressing strip by using alcohol or acetone, airing at room temperature, and coating a release agent on the surface for at least 2 times at intervals of at least 10 min;
step 2: a double-sided high-temperature adhesive tape is adhered between the molding surface of the main die and the boss and is close to the molding surface, and the width of the double-sided high-temperature adhesive tape is 5mm larger than that of the flange edge of the workpiece; pasting a layer of pressure-sensitive adhesive tape on the upper and the reverse sides of the double-sided high-temperature adhesive tape, wherein the width of the pressure-sensitive adhesive tape is consistent with that of the double-sided high-temperature adhesive tape, and flattening the double-sided high-temperature adhesive tape and the pressure-sensitive adhesive tape by using a polytetrafluoroethylene plate until no bubbles exist;
and step 3: laying a layer of red copper net on the forming surface of the main die, flatly adhering and compacting the edge of the red copper net with a pressure sensitive adhesive tape, and reserving 2mm allowance on the basis of the size of the inner surface of a workpiece on the forming surface;
and 4, step 4: laying 8 layers of carbon fiber prepreg on a red copper net, wherein the laying sequence is (+/-45 degrees/0 degrees/90) s, no bubble wrinkle is required to be generated between layers, firstly placing an outer pressing plate, a long pressing strip and a short pressing strip, then sequentially laying and covering an isolation film and a breathable felt, and sealing a vacuum bag;
and 5: putting the packaged product into a curing furnace, setting temperature, time and pressure parameters according to curing parameters of the carbon fiber prepreg, and starting heating and curing;
step 6: after the solidification is finished, removing auxiliary materials, removing the pressing plate, the long pressing strip and the short pressing strip, demolding, and tearing off the pressure-sensitive adhesive tape and the double-sided high-temperature adhesive tape on the flange edge of the workpiece; and (5) polishing the residual glue by using abrasive paper, and milling edges to obtain a final product.
The area density of the red copper net is 130g/m2, the thickness is 0.1mm, the mesh number is 100 meshes, and the high-frequency electromagnetic shielding effectiveness is more than 90 db; the heat-resistant temperature of the double-sided high-temperature adhesive tape and the pressure-sensitive adhesive tape is more than 150 ℃.
Advantageous effects
According to the invention, the red copper net and the carbon fiber prepreg are integrally formed by co-curing, so that the synchronous gluing and embedding of the red copper net in the forming process of the carbon fiber product are realized, and the phenomenon that a shielding layer is easy to fall off from a matrix in the existing shielding method is avoided; by using the combined die and ensuring the high precision of the die, the high dimensional precision requirement of the shielding layer of the carbon fiber workpiece is realized, and the phenomena of large surface roughness, poor plane precision and the like of the shielding layer in the existing shielding method are avoided; the high-frequency electromagnetic shielding requirement of the carbon fiber product is met through the excellent electromagnetic shielding efficiency of the red copper mesh and the combined adhesive separating effect of the double-sided high-temperature adhesive tape and the pressure-sensitive adhesive tape, and the boundary electromagnetic leakage phenomenon easily caused by the existing shielding method is avoided. The results of hundreds of sample machines of certain military model show that: the carbon fiber part designed by the method has excellent shielding efficiency and stable and reliable quality.
Drawings
FIG. 1 is a schematic structural diagram of a carbon fiber part: (a) the front surface of the carbon fiber part; (b) the reverse side of the carbon fiber product.
FIG. 2 is a schematic view of a primary mold structure;
FIG. 3 is a schematic view of the structure of a pressing plate, a long pressing strip and a short pressing strip;
figure 4 is a schematic view of the forming process according to the invention.
In the figure, 1 — the main mold; 2-pressing a plate; 3-long layering; 4-short layering; 5-forming surface of the main die; 6-boss of the main mould; 7-working surface of the main die; 8-high temperature double-sided tape; 9-pressure sensitive adhesive tape; 10-a red copper mesh; 11-carbon fiber prepreg.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
a forming die for an integrated copper-clad mesh electromagnetic shielding carbon fiber product comprises a main die 1, a pressing plate 2, a long pressing strip 3 and a short pressing strip 4. The main die 1 is of a male die structure and consists of a forming surface 5, a boss 6 and a working surface 7. Bosses 6 are arranged on the periphery of the forming surface 5 and used for positioning the long pressing strips 3 and the short pressing strips 4; the pressing plate 2 is of a rectangular structure, the long pressing strip 3 and the short pressing strip 4 are of 45-degree step structures, and the main die 1, the pressing plate 2, the long pressing strip 3 and the short pressing strip 4 are made of 45 steel.
A forming method of an integrated copper-clad mesh electromagnetic shielding carbon fiber product comprises the following steps:
step 1: cleaning a main die 1, a pressing plate 2, a long pressing strip 3 and a short pressing strip 4, and then coating a release agent for 2 times;
step 2: a double-sided high-temperature adhesive tape 8 is stuck to the flange edge of the main die 1, and the width of the double-sided high-temperature adhesive tape 8 is 5mm larger than that of the flange edge of a workpiece; a layer of pressure sensitive adhesive tape 9 is stuck on the upper and the back surfaces of the double-sided high-temperature adhesive tape 8, and the width of the pressure sensitive adhesive tape 9 is consistent with that of the double-sided high-temperature adhesive tape 8;
and step 3: a layer of red copper net 10 is laid on the main die 1, the red copper net 10 at the flange edge is flatly pasted and compacted with the pressure sensitive adhesive tape 9, and the size of the red copper net 10 at the molded surface is reserved with a margin of about 2mm on the basis of the size of the inner surface of a workpiece;
and 4, step 4: carbon fiber prepreg 11 is laid on the red copper net 10, and the laying sequence is (+/-45 degrees/0 degrees/90 degrees)sPlacing a pressing plate 2, a long pressing strip 3 and a short pressing strip 4, sequentially paving an isolating film and a breathable felt, and sealing a vacuum bag;
and 5: putting the packaged product into a curing furnace, setting temperature, time and pressure parameters according to curing parameters of the carbon fiber prepreg 11, and starting heating and curing;
step 6: after the solidification is finished, removing auxiliary materials, removing the pressing plate 2, the long pressing strip 3 and the short pressing strip 4, demolding, and tearing off the pressure-sensitive adhesive tape 9 and the double-sided high-temperature adhesive tape 8 on the flange edge of the workpiece; and (5) polishing the residual glue by using abrasive paper, and milling edges to obtain a final product.
The surface density of the red copper net 10 is 130g/m2The thickness is 0.1mm, the mesh number is 100 meshes, and the high-frequency electromagnetic shielding effectiveness is more than 90db (10 GHz-18 GHz).
The heat-resistant temperature of the double-sided high-temperature adhesive tape 8 and the pressure-sensitive adhesive tape 9 is more than 150 ℃.
Example (b):
referring to the attached drawing 1, the product is a carbon fiber cavity laminated piece with a flange edge, the thickness of the cavity is 1.0mm, the thickness of the flange edge is 1.5mm, the flatness of the flange edge requires 0.05mm, the forming and curing pressure is 0.1-0.2 Mpa, the forming and curing temperature is 125 ℃, and the electromagnetic shielding efficiency of the product is required to reach more than 90db (10 GHz-18 GHz).
Referring to fig. 2, the main mold 1 is a male mold structure, and is composed of a molding surface 5, a boss 6 and a working surface 7. The length and the width of the molding surface 5 are respectively subjected to thermal compensation on the basis of the size of the inner surface of the workpiece cavity, and the height is higher than the depth of the inner surface of the workpiece cavity by q, wherein q is the total thickness of the red copper mesh 10, the pressure sensitive adhesive tape 9 and the double-sided high-temperature adhesive tape 8. Bosses 6 are arranged on the periphery of the forming surface 5 and used for positioning the long pressing strip 3 and the short pressing strip 4, the distance from each boss to the forming surface 1 is r, and r is the sum of the width of the long pressing strip 3 and the short pressing strip 4 and the thickness of the inner cavity of a workpiece.
Referring to the attached figure 3, the pressing plate 2 is rectangular, the length and the width of the pressing plate are respectively 4mm smaller than the outer surface of the cavity of the workpiece, and the thickness of the pressing plate is 0.5 mm. The long pressing strip 3 and the short pressing strip 4 are both of a 45-degree step structure, the step distance difference is 1.5mm, the length of the long pressing strip 3 and the length of the short pressing strip 4 are respectively 2mm less than the length and the width of the outer surface of the cavity of the workpiece, the width of the long pressing strip 3 and the width of the short pressing strip 4 are 40mm, and the thickness of the long pressing strip is 2mm less than the depth of the cavity.
The main die 1, the pressing plate 2, the long pressing strip 3 and the short pressing strip 4 are all made of 45 steel.
The dimensions of the forming surface 5 of the main mould 1 in this embodiment are determined by the following equation:
s＝s1/(1+(αm-αc)ΔT) ①
p＝p1/(1+(αm-αc)ΔT) ②
in the formula: s is the length (unit: mm) of the molding surface 5 of the main mold 1; p is the width (unit: mm) of the molding surface 5; s1The length (unit: mm) of the inner surface of the cavity of the workpiece; p is a radical of1The width (unit: mm) of the inner surface of the cavity of the workpiece; alpha is alphamIs the coefficient of thermal expansion (unit:. times.10) of the mold material-6/℃)；αcThe thermal expansion coefficient (unit: x 10-6/DEG C) of the composite material; Δ T is the temperature difference (unit:. degree. C.) between the prepreg curing temperature and the ambient temperature.
The forming process adopted by the invention to realize the purpose comprises the following steps:
(1) cleaning the main die 1, the pressing plate 2, the long pressing strip 3 and the short pressing strip 4 by using alcohol or acetone, airing at room temperature, and coating a release agent on the surfaces for at least 2 times at intervals of at least 10 min.
(2) Firstly, a layer of double-sided high-temperature adhesive tape 8 is pasted around the flange edge of the main die 1, and the width 8 of the double-sided high-temperature adhesive tape is 5mm larger than that of the flange edge of a workpiece; and a layer of pressure-sensitive adhesive tape 9 is stuck on the upper surface and the back surface of the double-sided high-temperature adhesive tape 8, the width of the pressure-sensitive adhesive tape 9 is consistent with that of the double-sided high-temperature adhesive tape 8, and the double-sided high-temperature adhesive tape 8 and the pressure-sensitive adhesive tape 9 are flattened by a polytetrafluoroethylene plate until no air bubbles exist.
(3) A layer of red copper mesh 10 is laid on the main die 1, the red copper mesh 10 at the flange edge is flatly pasted and compacted with the pressure sensitive adhesive tape 9, the width of the red copper mesh 10 is consistent with that of the pressure sensitive adhesive tape 9, and the size of the red copper mesh 10 at the cavity molded surface is reserved with a margin of about 5mm on the basis of the length and the width of the molding surface 5;
(4) 8 layers of carbon fiber prepreg 11 are laid on the red copper net 10, and the laying sequence is (+/-45 degrees/0 degrees/90 degrees)sWhen no bubble wrinkle is required to be generated between layers, an outer pressing plate 2, a long pressing strip 3 and a short pressing strip 4 are firstly placed, then an isolating film and a breathable felt are sequentially paved, and a vacuum bag is sealed;
(5) putting the packaged product into a curing furnace, setting temperature, time and pressure parameters according to curing parameters of the carbon fiber prepreg 11, and starting heating and curing;
(6) after the solidification is finished, removing auxiliary materials, removing the outer pressing plate 2, the long pressing strip 3 and the short pressing strip 4, demolding, and tearing off the pressure-sensitive adhesive tape 9 and the double-sided high-temperature adhesive tape 8 on the flange edge of the workpiece; and (5) polishing the residual glue by using abrasive paper, and milling edges to obtain a final product.
Claims (1)
1. A forming method of an integrated copper-clad mesh electromagnetic shielding carbon fiber product is characterized by comprising the following steps:
step 1: cleaning the main die (1), the pressing plate (2), the long pressing strip (3) and the short pressing strip (4) by using alcohol or acetone, and after drying at room temperature, coating a release agent on the surfaces for at least 2 times at intervals of at least 10 min;
step 2: a double-sided high-temperature adhesive tape (8) is closely attached to the forming surface (5) between the forming surface (5) of the main die (1) and the boss (6), and the width of the double-sided high-temperature adhesive tape (8) is 5mm larger than that of a flange edge of a workpiece; a layer of pressure-sensitive adhesive tape (9) is pasted on the upper and the back surfaces of the double-sided high-temperature adhesive tape (8), the width of the pressure-sensitive adhesive tape (9) is consistent with that of the double-sided high-temperature adhesive tape (8), and the double-sided high-temperature adhesive tape (8) and the pressure-sensitive adhesive tape (9) are flattened by a polytetrafluoroethylene plate until no air bubbles exist;
and step 3: a layer of red copper net (10) is laid on the forming surface (5) of the main die (1), the edge of the red copper net (10) is flatly pasted and compacted with the pressure-sensitive adhesive tape (9), and the size of the red copper net (10) on the forming surface (5) is reserved with 2mm allowance on the basis of the size of the inner surface of a manufactured part;
and 4, step 4: 8 layers of carbon fiber prepregs (11) are laid on the red copper net (10), the laying sequence is (+/-45 degrees/0 degrees/90) s, no bubble wrinkle is required to be generated between layers, an outer pressing plate (2), a long pressing strip (3) and a short pressing strip (4) are firstly placed, then an isolation film and a breathable felt are sequentially laid, and a vacuum bag is sealed;
and 5: putting the packaged product into a curing furnace, setting temperature, time and pressure parameters according to curing parameters of the carbon fiber prepreg (11), and starting heating and curing;
step 6: after solidification, removing auxiliary materials, removing the pressing plate (2), the long pressing strip (3) and the short pressing strip (4), demolding, and tearing off the pressure-sensitive adhesive tape (9) and the double-sided high-temperature adhesive tape (8) on the flange edge of the workpiece; polishing the residual glue by using abrasive paper, and milling edges to obtain a final product;
the area density of the red copper net (10) is 130g/m2, the thickness is 0.1mm, the mesh number is 100 meshes, and the high-frequency electromagnetic shielding effectiveness is more than 90 db; the heat-resistant temperature of the double-sided high-temperature adhesive tape (8) and the pressure-sensitive adhesive tape (9) is more than 150 ℃.
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| CN201810868527.4A CN109130240B (en) | 2018-08-02 | 2018-08-02 | Forming die and forming method for integrated copper-clad electromagnetic shielding carbon fiber product |
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| CN109130240B true CN109130240B (en) | 2021-06-08 |
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| CN110406129B (en) * | 2019-08-29 | 2021-11-16 | 西安电子工程研究所 | Near-net forming die and forming method for antenna housing |
| CN111086237A (en) * | 2019-11-22 | 2020-05-01 | 江苏恒神股份有限公司 | Forming method of carbon fiber composite material flow guide shell |
| CN116021798B (en) * | 2023-01-28 | 2023-10-20 | 哈尔滨远驰航空装备有限公司 | Zero-glue-absorption forming method of composite material for air inlet channel |
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| EP2939820A1 (en) * | 2014-04-30 | 2015-11-04 | Airbus Operations, S.L. | Method and device for manufacturing a composite part of an aircraft |
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| CN105774095A (en) * | 2016-02-03 | 2016-07-20 | 江苏恒神股份有限公司 | Composite material panel with electromagnetic shielding function |
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| EP2939820A1 (en) * | 2014-04-30 | 2015-11-04 | Airbus Operations, S.L. | Method and device for manufacturing a composite part of an aircraft |
| CN104175569A (en) * | 2014-07-21 | 2014-12-03 | 青岛顺益新材料科技有限公司 | Method for manufacturing fiber reinforced thermoplastic composite materials |
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