CN109130240A - A kind of integrated molding die and forming method for covering copper electromagnetic shielding carbon fiber product - Google Patents
A kind of integrated molding die and forming method for covering copper electromagnetic shielding carbon fiber product Download PDFInfo
- Publication number
- CN109130240A CN109130240A CN201810868527.4A CN201810868527A CN109130240A CN 109130240 A CN109130240 A CN 109130240A CN 201810868527 A CN201810868527 A CN 201810868527A CN 109130240 A CN109130240 A CN 109130240A
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- Prior art keywords
- press strip
- carbon fiber
- adhesive tape
- product
- electromagnetic shielding
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Classifications
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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
-
- 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
Abstract
The present invention relates to a kind of molding die and forming method for being electromagnetically shielded carbon fiber product, molding die is made of master mold, pressing plate, long press strip, short press strip；Moulding process includes the following steps: mold cleaning；Paste adhesive tape；It is laid with copper mesh and prepreg；Product molding；Demoulding, post-processing.The present invention is integrally formed by the co-curing of red copper net and carbon fiber prepreg, is realized synchronous splicing merging of the red copper net in carbon fiber product forming process, is avoided shielded layer in existing method and be easy and matrix obscission；By the use of composable mold, the high dimensional accuracy requirement of carbon fiber product shielded layer is realized, phenomena such as shielded layer plane precision is poor in existing method is avoided；It is acted on by the combination of the different electromagnet shield effect of red copper network optimization and pressure sensitive adhesive tape every glue, realizes the high-frequency electromagnetic shielding requirement of carbon fiber product, avoid existing method high-frequency electromagnetic shielding inefficiency and boundary electromagnetism leakage phenomenon.
Description
Technical field
The invention belongs to mechanical, three technical fields of material and electromagnetism, are related to a kind of integrated electromagnetic shielding carbon fiber for covering copper
The mold design and forming method of product are tieed up, can be applied to should meet the requirement of structure high dimensional accuracy must be electromagnetically shielded again
Dual-use product scope.
Background technique
Carbon fibre composite has many advantages, such as lightweight, excellent in mechanical performance, environmental corrosion resisting, is manufacture lightweight, high-strength
Spend the ideal material of structural member.But the electromagnet shield effect of carbon fibre composite is poor, for there is electromagnetic shielding performance requirement
Carbon fiber product, need to increase metal layer to meet electromagnetic shielding requirements.
Currently, the electromagnetic shielding method of carbon fiber product mainly has metal plating layer, Bonding Metal layer and carbon fibre tow
Metallization.Metal plating layer is one layer of metal screen layer of chemical plating or coating in the shielded surfaces of carbon fiber product.It is glued gold
Belonging to layer is to be bonded one layer of metal foil shielded layer in carbon fiber product shielded surfaces adhesive.Carbon fibre tow metallization is in carbon
First metal lining shielded layer on fibre bundle surface infiltrates resin again, realizes carbon fiber bulk material electromagnetic shielding characteristic.
Existing carbon fiber product electromagnetic shielding method is other than at high cost and shielded layer quality weight, and there is also as following drawbacks:
(1) plating or Bonding Metal layer surface roughness are big, plane precision is poor, salt spray corrosion resistance is poor, and shielded layer is easy
It falls off.
(2) the shielding uniformity and high-frequency electromagnetic shielding inefficiency of carbon fibre tow metalization layer.
Certain product carbon fiber product be thin-walled inner cavity structure with flange, it is desirable that high-frequency electromagnetic shielding, high dimensional accuracy and
Shielded layer resisting salt fog corrosion, while needing to meet low cost and indexs, the existing screen methods such as shielded layer is light-weight cannot
Meet design requirement.
Summary of the invention
Technical problems to be solved
It is different using red copper network optimization it is an object of the invention to overcome the shortcomings of existing carbon fiber product electromagnetic shielding method
High-frequency electromagnetic shielding and environmental corrosion resisting characteristic are protected by red copper net and the molding high dimensional accuracy of carbon fiber prepreg co-curing
Card obtains a kind of screen method of new carbon fiber product, it is rotten to meet carbon fiber product electromagnetic shielding, dimensional accuracy, salt spray resistance
The index requests such as erosion, low cost and lightweight.
Technical solution
A kind of integrated molding die for covering copper electromagnetic shielding carbon fiber product, the integrated copper that covers are electromagnetically shielded carbon fiber
Product is inner cavity structure with flange, it is characterised in that including master mold, pressing plate, long press strip and short press strip；The master mold
For punch structure, it is made of forming surface, boss and working face；Boss is arranged in forming surface surrounding, for positioning long press strip and short pressure
Item；Pressing plate is rectangular configuration, and length, width are 4mm smaller than product chamber outer surface size respectively；Long press strip, short press strip are 45 °
Step structure.
The length of the forming surface, width carry out thermal compensation on the basis of product cavity inner surface size respectively, mend
Repaying coefficient is 1/ [1+ (αm-αf) Δ T)], in which: αm: the thermal expansion coefficient of mold materials, unit: × 10-6/ DEG C；αc: it is compound
The thermal expansion coefficient of material, unit: × 10-6/ DEG C；Δ T: the temperature difference between prepreg solidification temperature and environment temperature, it is single
Position: DEG C.
The master mold, pressing plate, long press strip, short press strip material are 45 steel.
A kind of integrated forming method for covering copper mesh electromagnetic shielding carbon fiber product, it is characterised in that steps are as follows:
Step 1: master mold, pressing plate, long press strip, short press strip are cleared up with alcohol or acetone, after drying at room temperature, surface coating
Release agent at least 2 times, interval time at least 10min；
Step 2: closely forming surface pastes double-sided elevated temperature adhesive tape, double-sided elevated temperature glue between the forming surface and boss of master mold
Band is 5mm bigger than product flange hem width degree；Reverse side pastes a lamination sensitive tape on double-sided elevated temperature adhesive tape, pressure sensitive adhesive tape width with it is two-sided
High temperature gummed tape is consistent, is flattened double-sided elevated temperature adhesive tape and pressure sensitive adhesive tape with polyfluortetraethylene plate, until bubble-free；
Step 3: one layer of red copper net is laid in the forming surface of master mold, the side of red copper net and pressure sensitive adhesive tape develop compacting, at
Red copper net size on type face reserves 2mm surplus on product inner surface size basis；
Step 4: red copper is laid with 8 layers of carbon fiber prepreg on the net, and ply stacking-sequence is (± 45 °/0 °/90) s, and interlayer requires nothing
Bubble gauffer generates, and first places outer plate, long press strip, short press strip, then be successively coated with isolation film, airfelt, vacuum bag sealing；
Step 5: packaged product is put into curing oven, according to the cure parameter of carbon fiber prepreg be arranged temperature,
Time, pressure parameter, and begin to warm up solidification；
Step 6: after solidification, removing auxiliary material, remove pressing plate, long press strip, short press strip, product flange is torn in demoulding
On pressure sensitive adhesive tape and double-sided elevated temperature adhesive tape；With sand paper polishing removing residual glue, milling side obtains final product.
The surface density of the red copper net is 130g/m2, and thickness 0.1mm, mesh number is 100 mesh, high-frequency electromagnetic shielding efficiency
Greater than 90db；The heat resisting temperature of double-sided elevated temperature adhesive tape and pressure sensitive adhesive tape is greater than 150 DEG C.
Beneficial effect
The present invention is integrally formed by the co-curing of red copper net and carbon fiber prepreg, realizes red copper net in carbon fiber system
Synchronous splicing merging in part forming process, avoids shielded layer in existing screen method and is easy and matrix obscission；Pass through
The use of composable mold and the high-precision of mold guarantee, realize the high dimensional accuracy requirement of carbon fiber product shielded layer, keep away
Phenomena such as shielded layer surface roughness is big, plane precision is poor in existing screen method is exempted from；Pass through the different electromagnetic screen of red copper network optimization
The combination for covering efficiency and double-sided elevated temperature adhesive tape and pressure sensitive adhesive tape is acted on every glue, and the high-frequency electromagnetic shielding for realizing carbon fiber product is wanted
It asks, avoids the boundary electromagnetism leakage phenomenon that existing screen method is easily led to.The several hundred set model machines of certain military products model the result shows that:
The carbon fiber component shield effectiveness designed with the method is excellent, and quality is reliable and stable.
Detailed description of the invention
Fig. 1 carbon fiber product structural schematic diagram: the carbon fiber product front (a)；(b) carbon fiber product reverse side.
Fig. 2 master mold structural schematic diagram；
Fig. 3 pressing plate, long press strip, short layering structure schematic diagram；
Fig. 4 shaping schematic view of the present invention.
In figure, 1- master mold；2- pressing plate；3- long press strip；The short press strip of 4-；5- master mold forming surface；6- master mold boss；7-
Master mold working face；8- high temperature double faced adhesive tape；9- pressure sensitive adhesive tape；10- red copper net；11- carbon fiber prepreg.
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
A kind of integrated molding die for covering copper mesh electromagnetic shielding carbon fiber product, by master mold 1, pressing plate 2, long press strip 3, short
Press strip 4 forms.Master mold 1 is punch structure, is made of forming surface 5, boss 6 and working face 7.Boss is arranged in 5 surrounding of forming surface
6, for positioning long press strip 3 and short press strip 4；Pressing plate 2 is rectangular configuration, and long press strip 3, short press strip 4 are 45 ° of step structures, institute
Stating master mold 1, pressing plate 2, long press strip 3,4 material of short press strip is 45 steel.
A kind of integrated forming method for covering copper mesh electromagnetic shielding carbon fiber product, using following steps:
Step 1: after master mold 1, pressing plate 2, long press strip 3, short press strip 4 are cleaned out, smearing release agent 2 times；
Step 2: double-sided elevated temperature adhesive tape 8 is pasted at 1 flange of master mold, double-sided elevated temperature adhesive tape 8 is than product flange hem width degree
Big 5mm；Reverse side pastes a lamination sensitive tape 9 on double-sided elevated temperature adhesive tape 8, and 9 width of pressure sensitive adhesive tape and double-sided elevated temperature adhesive tape 8 are consistent；
Step 3: one layer of red copper net 10 is laid in master mold 1, the red copper net 10 and pressure sensitive adhesive tape 9 at flange develop pressure
Real, 10 size of red copper net reserves 2mm or so surplus on product inner surface size basis at type face；
Step 4: carbon fiber prepreg 11 is laid on red copper net 10, ply stacking-sequence is (± 45 °/0 °/90 °)s, place pressing plate
2, long press strip 3, short press strip 4, then it is successively coated with isolation film, airfelt, vacuum bag sealing；
Step 5: packaged product being put into curing oven, temperature is arranged according to the cure parameter of carbon fiber prepreg 11
Degree, time, pressure parameter, and begin to warm up solidification；
Step 6: after solidification, removing auxiliary material, remove pressing plate 2, long press strip 3, short press strip 4, product flange is torn in demoulding
Pressure sensitive adhesive tape 9 and double-sided elevated temperature adhesive tape 8 on side；With sand paper polishing removing residual glue, milling side obtains final product.
The surface density of the red copper net 10 is 130g/m2, thickness 0.1mm, mesh number is 100 mesh, high-frequency electromagnetic shielding efficiency
For 90db or more (10GHz~18GHz).
The heat resisting temperature of the double-sided elevated temperature adhesive tape 8 and pressure sensitive adhesive tape 9 is 150 DEG C or more.
Embodiment:
Referring to figure 1, which is carbon fiber cavity laminate with flange, cavity thickness 1.0mm, flange thickness
Spend 1.5mm, flange planarity requirements 0.05mm, forming and hardening 0.1~0.2Mpa of pressure, 125 DEG C of forming and hardening temperature, product
It is required that electromagnet shield effect reaches 90db or more (10GHz~18GHz).
Referring to shown in attached drawing 2, master mold 1 is punch structure, is made of forming surface 5, boss 6 and working face 7.Forming surface 5
Length, width carry out thermal compensation on the basis of product cavity inner surface size respectively, highly than product cavity inner surface depth
High q is spent, wherein q is the overall thickness of red copper net 10, pressure sensitive adhesive tape 9 and double-sided elevated temperature adhesive tape 8.Boss 6 is arranged in 5 surrounding of forming surface,
For positioning long press strip 3 and short press strip 4, the distance of boss to forming surface 1 is r, and wherein r is the width of long press strip 3, short press strip 4
With the summation of product lumen thickness.
It participates in shown in attached drawing 3, pressing plate 2 is rectangular configuration, and length, width are 4mm smaller than product chamber outer surface size respectively,
With a thickness of 0.5mm.Long press strip 3, short press strip 4 are 45 ° of step structures, step range difference 1.5mm, long press strip 3, short press strip 4
Length is 2mm smaller than product chamber outer surface length and width respectively, width 40mm, and thickness is 2mm smaller than product cavity depth.
The master mold 1, pressing plate 2, long press strip 3,4 material of short press strip are 45 steel.
The size of the forming surface 5 of master mold 1 is determined by following formula in the present embodiment:
S=s1/(1+(αm-αc)ΔT) ①
P=p1/(1+(αm-αc)ΔT) ②
In formula: s is the length (unit: mm) of 1 forming surface 5 of master mold；P is the width (unit: mm) of forming surface 5；s1For
Product cavity inner surface length (unit: mm)；p1Product cavity inner surface width (unit: mm)；αmFor the thermal expansion of mold materials
Coefficient (unit: × 10-6/℃)；αcFor the thermal expansion coefficient (unit: × 10-6/ DEG C) of composite material；Δ T is prepreg solidification
Temperature difference (unit: DEG C) between temperature and environment temperature.
The present invention realizes that moulding process used by its purpose includes the following steps:
(1) with alcohol or acetone cleaning master mold 1, pressing plate 2, long press strip 3 and short press strip 4, after drying at room temperature, surface is applied
Release agent at least 2 times are covered, interval time at least 10min.
(2) 1 flange surrounding of master mold first pastes one layer of double-sided elevated temperature adhesive tape 8, and double-sided elevated temperature tape width 8 is than product method
The blue big 5mm of hem width degree；Reverse side pastes a lamination sensitive tape 9,9 width of pressure sensitive adhesive tape and double-sided elevated temperature glue on double-sided elevated temperature adhesive tape 8
Band 8 is consistent, is flattened double-sided elevated temperature adhesive tape 8 and pressure sensitive adhesive tape 9 with polyfluortetraethylene plate, until bubble-free.
(3) one layer of red copper net 10 is laid in master mold 1, the red copper net 10 and pressure sensitive adhesive tape 9 at flange develop compacting, wide
Degree is consistent with pressure sensitive adhesive tape 9, and it is left to reserve 5mm on the basis of the length of forming surface 5, width for 10 size of red copper net at cavity type face
Right surplus；
(4) 8 layers of carbon fiber prepreg 11 are laid on red copper net 10, ply stacking-sequence is (± 45 °/0 °/90 °)s, interlayer requirement
Bubble-free gauffer generates, and first places outer plate 2, long press strip 3, short press strip 4, then be successively coated with isolation film, airfelt, vacuum bag is close
Envelope；
(5) packaged product is put into curing oven, according to the cure parameter of carbon fiber prepreg 11 be arranged temperature, when
Between, pressure parameter, and begin to warm up solidification；
(6) after solidifying, auxiliary material is removed, removes outer plate 2, long press strip 3, short press strip 4, product flange is torn in demoulding
Pressure sensitive adhesive tape 9 and double-sided elevated temperature adhesive tape 8 on side；With sand paper polishing removing residual glue, milling side obtains final product.
Claims (5)
1. a kind of integrated molding die for covering copper electromagnetic shielding carbon fiber product, the integrated copper that covers is electromagnetically shielded carbon fiber system
Part is inner cavity structure with flange, it is characterised in that including master mold (1), pressing plate (2), long press strip (3) and short press strip (4)；Institute
The master mold (1) stated is punch structure, is made of forming surface (5), boss (6) and working face (7)；The setting of forming surface (5) surrounding
Boss (6), for positioning long press strip (3) and short press strip (4)；Pressing plate (2) is rectangular configuration, and length, width are respectively than product chamber
The small 4mm of external surface size；Long press strip (3), short press strip (4) are 45 ° of step structures.
2. a kind of integrated molding die for covering copper electromagnetic shielding carbon fiber product according to claim 1, it is characterised in that
The length of the forming surface (5), width carry out thermal compensation, penalty coefficient on the basis of product cavity inner surface size respectively
For 1/ [1+ (αm-αf) Δ T)], in which: αm: the thermal expansion coefficient of mold materials, unit: × 10-6/ DEG C；αc: composite material
Thermal expansion coefficient, unit: × 10-6/ DEG C；Δ T: the temperature difference between prepreg solidification temperature and environment temperature, unit: DEG C.
3. a kind of integrated molding die for covering copper electromagnetic shielding carbon fiber product according to claim 1, it is characterised in that
The master mold (1), pressing plate (2), long press strip (3), short press strip (4) material are 45 steel.
4. a kind of molding die described in claim 1 covers the forming method of copper mesh electromagnetic shielding carbon fiber product for integrating,
It is characterized by the following steps:
Step 1: master mold (1), pressing plate (2), long press strip (3), short press strip (4) are cleared up with alcohol or acetone, after drying at room temperature,
Surface coats release agent at least 2 times, interval time at least 10min；
Step 2: closely forming surface (5) pastes double-sided elevated temperature adhesive tape between the forming surface (5) and boss (6) of master mold (1)
(8), double-sided elevated temperature adhesive tape (8) is 5mm bigger than product flange hem width degree；Reverse side pastes one layer of pressure sensitive adhesive on double-sided elevated temperature adhesive tape (8)
Band (9), pressure sensitive adhesive tape (9) width and double-sided elevated temperature adhesive tape (8) unanimously, with polyfluortetraethylene plate by double-sided elevated temperature adhesive tape (8) and
Pressure sensitive adhesive tape (9) flattens, until bubble-free；
Step 3: one layer of red copper net (10), the side of red copper net (10) and pressure sensitive adhesive tape are laid in the forming surface (5) of master mold (1)
(9) compacting is developed, red copper net (10) size in forming surface (5) reserves 2mm surplus on product inner surface size basis；
Step 4: 8 layers of carbon fiber prepreg (11) are laid on red copper net (10), ply stacking-sequence is (± 45 °/0 °/90) s, and interlayer is wanted
It asks bubble-free gauffer to generate, first places outer plate (2), long press strip (3), short press strip (4), then be successively coated with isolation film, airfelt,
Vacuum bag sealing；
Step 5: packaged product is put into curing oven, according to the cure parameter of carbon fiber prepreg (11) be arranged temperature,
Time, pressure parameter, and begin to warm up solidification；
Step 6: after solidification, removing auxiliary material, remove pressing plate (2), long press strip (3), short press strip (4), product method is torn in demoulding
Pressure sensitive adhesive tape (9) and double-sided elevated temperature adhesive tape (8) on blue side；With sand paper polishing removing residual glue, milling side obtains final product.
5. the integrated copper that covers according to claim 4 is electromagnetically shielded carbon fiber product forming method, it is characterised in that described
The surface density of red copper net (10) is 130g/m2, and thickness 0.1mm, mesh number is 100 mesh, and high-frequency electromagnetic shielding efficiency is greater than 90db；It is double
The heat resisting temperature of face high temperature gummed tape (8) and pressure sensitive adhesive tape (9) is greater than 150 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810868527.4A CN109130240B (en) | 2018-08-02 | 2018-08-02 | Forming die and forming method for integrated copper-clad electromagnetic shielding carbon fiber product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN109130240A true CN109130240A (en) | 2019-01-04 |
| CN109130240B CN109130240B (en) | 2021-06-08 |
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| 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 |
| CN116021798A (en) * | 2023-01-28 | 2023-04-28 | 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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| CN110406129A (en) * | 2019-08-29 | 2019-11-05 | 西安电子工程研究所 | A kind of antenna house near-net-shape mold and forming method |
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| CN116021798A (en) * | 2023-01-28 | 2023-04-28 | 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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