CN108501404A - A kind of preparation method and mold of composite fibre shell - Google Patents
A kind of preparation method and mold of composite fibre shell Download PDFInfo
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- CN108501404A CN108501404A CN201810263376.XA CN201810263376A CN108501404A CN 108501404 A CN108501404 A CN 108501404A CN 201810263376 A CN201810263376 A CN 201810263376A CN 108501404 A CN108501404 A CN 108501404A
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- mold
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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
- B29C70/40—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
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/462—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
-
- 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
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
-
- 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
- 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
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Reinforced Plastic Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of preparation methods of composite fibre shell, include the following steps：Fibrous raw material is placed in mold, upper and lower mould semi-closed, wherein the semi-closed, which characterizes, has gap between the fibrous raw material and upper mold；The die cavity of semi-closed is infused resin by injection device, wherein mould intracavity gas is discharged by the exhaust apparatus of the mold in resin injection process；Mold is closed completely, to reach required component thickness；Obtain composite fibre shell.The present invention is by increasing mold semi-closure conjunction state, allow resin smooth outflow in a larger space, the air in die cavity and abundant wetting fibre is discharged, effectively prevent the surface that dry area remains in component, since fiber is infiltrated in advance, hot-forming pressure is greatly reduced, and then greatly reduces the probability of torsion of fibers dislocation.Using fiber and resin as raw material, material cost is also greatly lowered compared with conventional method, and raw material selects freedom higher.
Description
Technical field
The present invention relates to field of material technology more particularly to a kind of preparation methods and mold of composite fibre shell.
Background technology
Electronic product casing made of the fibrous composites such as carbon fiber, aramid fiber, glass fibre has both light and thin
The characteristics of, appearance can more play the spy of its high-strength light rich in high texture and high-tech feeling, especially continuous fiber composite material
Point becomes one of the hot spot that major brand manufacturers competitively researches and develops.
Current composite fibre shell manufacture craft is continuous carbon fibre prepreg compression molding, and prepreg is at normal temperatures
For dry state, as temperature constantly increases in mold process, the resin in prepreg is gradually softened thinning by dry state, and viscosity constantly becomes
Small, when temperature is continued to rise to up to solidification point, resin crosslinks, and viscosity gradually increases, until being fully cured and becoming dry state.
Since resin is by " dry " change " wet ", then become " dry ", in order to which resin substantially uniformity is spread over entire product surface, and
It is sufficiently impregnated inside product shell, especially resin to be made to reach and infiltrates the corner of 3D form shells, it is necessary in mold process
It imposes severe pressure to resin.And fiber can be inevitably displaced under such pressure, lead to torsion of fibers or line
Road entanglement.Such case shows particularly evident in the edge of 3D shells.This torsion of fibers or entanglement, not only directly affect
Product appearance can also be such that product strength and rigidity loses.Meanwhile it fully relying on higher press pressure and promoting resin stream
It is dynamic, and contact high between fibrous layer and mold profile inner wall so that infused through both parts surface completely becomes after resin softening
It is difficult.
In addition, the preparation of prepreg is a considerably complicated and accurate process, equipment cost is also very high.Although prepreg
And be made of carbon fiber and resin two parts, but its price is both identical weight carbon fiber+resins individually the sum of price
3-4 times, it is with high costs.
Invention content
In view of this, the technical problem to be solved in the present invention be to provide a kind of composite fibre shell preparation method and
Mold, it is at low cost, and product quality is high.
The present invention provides a kind of preparation methods of composite fibre shell, include the following steps：
Fibrous raw material is placed in mold, upper and lower mould semi-closed, wherein the semi-closed characterizes the fibrous raw material and upper
There is gap between mould；
The die cavity of semi-closed is infused resin by injection device, wherein pass through the mold in resin injection process
Exhaust apparatus be discharged mould intracavity gas；
Mold is closed completely, to reach required component thickness；
Obtain composite fibre shell.
Preferably, further include being heating and curing after the mold is closed completely.
Preferably, the pressure being heating and curing is 0.1~0.5MPa.
Preferably, the gap width between the fibrous raw material and upper mold is the 20%~50% of thickness of shell.
Preferably, the fibrous raw material is more than 1 layer, and the fiber direction of adjacent layer is non-parallel.
The present invention provides a kind of mold, including upper die and lower die, peripheral sealing is provided between the upper die and lower die
Device is used for sealing when mold semi-closure conjunction state；
The upper mold is provided with injection device and exhaust apparatus.
Preferably, the injection device is connect with resin feeding system, and the resin feeding system includes air pump, resinogen
Expect storage device and mixing arrangement.
Preferably, it is provided with fixing device between the upper die and lower die, is used for the fixation of mold semi-closure conjunction state.
Preferably, the mold further includes heating device.
Preferably, the peripheral sealing device is the elastic seal ring between being set to upper die and lower die.
Compared with prior art, the present invention provides a kind of preparation method of composite fibre shell, include the following steps：It will
Fibrous raw material is placed in mold, upper and lower mould semi-closed, wherein the semi-closed characterizes to be had between the fibrous raw material and upper mold
Gap；The die cavity of semi-closed is infused resin by injection device, wherein pass through the row of the mold in resin injection process
Mould intracavity gas is discharged in device of air；Mold is closed completely, to reach required component thickness；Obtain composite fibre shell.This hair
It is bright that resin smooth outflow in a larger space is allow by increase mold semi-closure conjunction state, the sky in die cavity is discharged
Gas and abundant wetting fibre effectively prevent the surface that dry area remains in component and are substantially reduced since fiber is infiltrated in advance
Hot-forming pressure, and then greatly reduce the probability of torsion of fibers dislocation.It is fine using individual fibrous raw material and resin
The selection freedom higher of peacekeeping resin, the shape of fiber and the component of resin can freely be adjusted according to product.With fiber
It is raw material with resin, material cost is also greatly lowered compared with conventional method.
Description of the drawings
Fig. 1 is mold semi-closed status diagram in the present invention；
Fig. 2 is mold fully closed condition schematic diagram in the present invention；
Fig. 3 is mold schematic diagram provided by the invention.
Specific implementation mode
The present invention provides a kind of preparation methods of composite fibre shell, include the following steps：
Fibrous raw material is placed in mold, upper and lower mould semi-closed, wherein the semi-closed characterizes the fibrous raw material and upper
There is gap between mould；
The die cavity of semi-closed is infused resin by injection device, wherein pass through the mold in resin injection process
Exhaust apparatus be discharged mould intracavity gas；
Mold is closed completely, to reach required component thickness；
Obtain composite fibre shell.
The present invention is due to increasing mold semi-closure conjunction state so that resin can prepare work with smooth outflow and wetting fibre
It is raw material that resin and fiber, which may be used, in skill, and the selection of raw material is freer.
In the present invention, the fibrous raw material can select natural fiber, inorfil or synthesis according to shell material demand
Fiber, such as carbon fiber, glass fibre, polyester fiber or aromatic polyamide fibre can also select a variety of fibres according to material demand
It ties up raw material and forms composite material.
In some embodiments of the invention, the fibrous raw material is carbon cloth, and the carbon cloth is not soak
The carbon cloth of stain resin.
The form of the fiber can not also circumscribed, can be band-like, sheet or felt shape etc..
In some embodiments of the invention, the fiber be Nomex, the needling structure with z-axis direction,
During thermocompression forming, due to the power in z-axis direction so that fiber interlayer is not susceptible to distort or misplace, and improves yield rate.
The number of plies of the fibrous raw material can be adjusted according to product thickness, can be that single layer is arranged, or and multilayer is arranged,
Preferably greater than 1 layer.Its overall thickness is preferable slightly larger than product thickness, can be real by each lamination when to be molded.
When being arranged for multilayer, the fiber direction of adjacent layer is preferably non-parallel.It is furthermore preferred that the fiber row of adjacent layer
Column direction has 30 °~120 ° angles.
In some embodiments of the invention, the fiber of the adjacent layer is vertical arrangement.
The above arrangement mode can make fiber form reticular structure, increase casing rigidity.
The present invention can cut fibrous raw material, cut size is preferably than the expansion of product first according to product size
Size is slightly larger, so as to for following process when deburring reserve safe clearance.
The total weight of the fibrous raw material is preferably the 50%~70% of case weight.
After fibrous raw material is placed in mold, by mold upper and lower mould semi-closed, wherein the semi-closed characterizes the fiber
There is gap between raw material and upper mold.
The semi-closed status diagram is as shown in Figure 1, wherein 1 gap reserved between fibrous raw material and upper mold.
The size in the gap can be adjusted according to shell dimension, it is preferred that the gap width is thickness of shell
20%~50%, which can make the runner in mould for casting resin become wider, also reduce the resistance of resin flowing,
Ensure that resin smooth can trickle, and wetting fibre.
Then the die cavity of semi-closed is infused resin by injection device, wherein by described in resin injection process
Mould intracavity gas is discharged in the exhaust apparatus of mold.
The resin can select to be applicable in type, such as epoxylite or polyolefin resin according to shell material, this
Invention is to this and is not particularly limited.
Can also include auxiliary agent in the resin, such as curing agent, accelerating agent, diluent, stabilizer, antifoaming agent or toughener
Etc. applicable auxiliary agent well known to those skilled in the art.
The present invention also and is not particularly limited the additive amount of the auxiliary agent, can voluntarily be adjusted according to shell material.
Resin constantly flows, complete wetting fiber surface in injection process.
It waits for that resin injection finishes, mold is closed completely, to reach required component thickness.
It is as shown in Figure 2 that the mold is closed completely schematic diagram.
When the thickness needed for press is closed into component, compression travel oppresses resin penetration fibrous raw material, ensures that
All fibers are all fully infiltrated.Since when resin injects before, mold is in semi-closure conjunction state, and resin is certain
Fiber has been infiltrated in degree.Thus press pressure at this time is without excessive, to ensure that the fiber of edge will not be due to pressure
Power is excessive and is rushed disorderly by resin.
The pressure of the press is preferably 0.1~0.5MPa.
Then the operation that is heating and curing is carried out.
The temperature being heating and curing can set mould heating-up temperature, make resin solidification according to resin types.
The pressure being heating and curing is preferably 0.1~0.5MPa.
It can be obtained composite fibre shell after demoulding.
It is currently preferred, the post-processing of shell can also be included, as CNC clear up product surrounding hair stubble, polishing surface,
The conventional post-processing operation such as spray painting.
The present invention allows resin smooth outflow in a larger space by the semi-closure conjunction state of increase mold,
The air in die cavity and abundant wetting fibre is discharged, the surface that dry area remains in component is effectively prevented, since fiber shifts to an earlier date
It is infiltrated, greatly reduces hot-forming pressure, and then greatly reduce the probability of torsion of fibers dislocation.Use individual fibre
Raw material and resin are tieed up, the selection freedom higher of fiber and resin, the shape of fiber and the component of resin can be according to products
Freely adjust.Using fiber and resin as raw material, material cost is also greatly lowered compared with conventional method.
It is close it to be provided with periphery the present invention also provides a kind of mold, including upper die and lower die, between the upper die and lower die
Seal apparatus is used for sealing when mold semi-closure conjunction state；
The upper mold is provided with injection device and exhaust apparatus.
The schematic diagram of the mold is as shown in Figure 3.
Wherein, 301 be exhaust duct, and 302 be upper mold, and 303 be elastic seal ring, and 305 be lower die, and 306 be injection orifice, 307
It is resin raw material storage device for air pump, 308,309 be auxiliary agent storage device, and 310 be mixing arrangement.
Wherein, 304 mold is indicated in use state, the fibrous raw material of laying.
The injection device and exhaust apparatus can be set as the forms such as duct or slot according to demand, as long as may be implemented
Liquid injects and gas discharge, and the present invention is to this and is not particularly limited.
Currently preferred, the injection device is connect with resin feeding system, the resin feeding system include air pump,
Resin raw material storage device and mixing arrangement.
Resin raw material is pumped into mixing arrangement by air pump, after mixing, is injected in mold by injection device.
Currently preferred, the resin raw material storage device can be multiple, store resin and auxiliary agent, Ke Yigen respectively
It is pumped into mixing arrangement respectively according to raw material proportioning.
It is provided with fixing device between the upper die and lower die, is used for the fixation of mold semi-closure conjunction state.The fixed dress
Setting can be fixing device well known to those skilled in the art, such as buckle.
In the present invention, the mold further includes heating device, for being heating and curing to resin.
It is provided with peripheral sealing device between the upper die and lower die, is set to die edge, is used for mold semi-closed shape
The sealing of die cavity when state.
The peripheral sealing device is preferably elastic material, such as rubber, can be with better seal cavity body of mould.
In some embodiments of the invention, the peripheral sealing device is the bullet between being set to upper die and lower die
Property sealing ring.
The present invention prepares fibrous composite using above-mentioned mold, can bet into resin, then in semi-closure conjunction state
It is closed completely and heats, make resin and fiber complete wetting and cure, ensure that the quality of composite material.
In order to further illustrate the present invention, with reference to embodiment to the preparation side of composite fibre shell provided by the invention
Method and mold are described in detail.
Embodiment 1
Product is the shell of thickness 1.0mm, using the carbon cloth (the hereinafter referred to as dry cloth of carbon fiber) for being not impregnated with resin, single layer
Thickness is 0.15mm, and 8 layers are laid in mold, lays order and is【90°/0°/90°/0°/90°/0°/90°/0°】.
The gap of mold semi-closed, the dry cloth of carbon fiber and upper mould is 0.2mm.
Resin is propanepoxy resin, and curing agent is maleic anhydride, and the two is according to 1:1 ratio is mixing
After being mixed in device, under the effect of the pressure, die cavity is injected.
Die cavity is surrounded by the sealing ring of elastic material making, to ensure that resin does not overflow mould before wetting fibre
Outside chamber.It is additionally provided with gas vent and exhaust passage on mold, resin can be by die cavity in injection process, including remains in carbon fiber
The air row of dry cloth between layers drives away.
After resin injection, mold is closed completely.When the thickness needed for press is closed into component, compression travel compressing tree
Fat permeates the dry cloth of carbon fiber, and all fibers are all fully infiltrated.Press pressure 0.2MPa.
It is heating and curing, 150~200 DEG C of mold temperature, 0.5~1.0h of hardening time.
After resin solidification, mold is opened, product is taken out, obtains fiber composite shell.
Compared with using prepreg, totle drilling cost reduces by 20%~30%.
25 shells are made according to above-mentioned technique.The results are shown in Table 1.
Comparative example 1
Using carbon fiber prepreg as raw material, hot pressing is carried out using traditional handicraft, makes shell, thickness of shell 1.0mm, hot pressing
Pressure 2MPa.
25 shells are made according to above-mentioned technique.The results are shown in Table 1.
1 embodiment 1 of table prepares shell appearance quality detection result with comparative example 1
By above-described embodiment and comparative example it is found that preparation process provided by the invention, reduces cost, yield rate is simultaneously
It greatly improves.
The explanation of above example is only intended to facilitate the understanding of the method and its core concept of the invention.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of preparation method of composite fibre shell, includes the following steps：
Fibrous raw material is placed in mold, upper and lower mould semi-closed, wherein the semi-closed characterize the fibrous raw material and upper mold it
Between have gap；
The die cavity of semi-closed is infused resin by injection device, wherein pass through the row of the mold in resin injection process
Mould intracavity gas is discharged in device of air；
Mold is closed completely, to reach required component thickness；
Obtain composite fibre shell.
2. preparation method according to claim 1, which is characterized in that further include that heating is solid after the mold is closed completely
Change.
3. preparation method according to claim 2, which is characterized in that the pressure being heating and curing is 0.1~0.5MPa.
4. preparation method according to claim 1, which is characterized in that the gap width between the fibrous raw material and upper mold
It is the 20%~50% of thickness of shell.
5. preparation method according to claim 1, which is characterized in that the fibrous raw material is more than 1 layer, and the fibre of adjacent layer
It is non-parallel to tie up orientation.
6. a kind of mold, including upper die and lower die, it is provided with peripheral sealing device between the upper die and lower die, for mold half
Sealing when closed state；
The upper mold is provided with injection device and exhaust apparatus.
7. mold according to claim 6, which is characterized in that the injection device is connect with resin feeding system, described
Resin feeding system includes air pump, resin raw material storage device and mixing arrangement.
8. mold according to claim 6, which is characterized in that be provided with fixing device between the upper die and lower die, use
In the fixation of mold semi-closure conjunction state.
9. mold according to claim 6, which is characterized in that the mold further includes heating device.
10. mold according to claim 6, which is characterized in that the peripheral sealing device is to be set to upper die and lower die
Between elastic seal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810263376.XA CN108501404A (en) | 2018-03-28 | 2018-03-28 | A kind of preparation method and mold of composite fibre shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810263376.XA CN108501404A (en) | 2018-03-28 | 2018-03-28 | A kind of preparation method and mold of composite fibre shell |
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| CN108501404A true CN108501404A (en) | 2018-09-07 |
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| CN201810263376.XA Pending CN108501404A (en) | 2018-03-28 | 2018-03-28 | A kind of preparation method and mold of composite fibre shell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119492A (en) * | 2021-04-13 | 2021-07-16 | 山东医学高等专科学校 | Preparation method of marine propeller blade fiber reinforced composite material |
| CN113211827A (en) * | 2020-01-21 | 2021-08-06 | 丰田自动车株式会社 | Method and apparatus for producing fiber-reinforced resin molded article |
| CN115257012A (en) * | 2022-08-15 | 2022-11-01 | 博材智能科技(东台)有限公司 | Hot press forming device for carbon fiber composite material |
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| CN1962232A (en) * | 2006-11-27 | 2007-05-16 | 浙江苏泊尔橡塑制品有限公司 | Thermosetting plastic injection transfer moulding method and its mould |
| CN101143492A (en) * | 2007-11-02 | 2008-03-19 | 贵州云马飞机制造厂 | Compression type RTM forming method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113211827A (en) * | 2020-01-21 | 2021-08-06 | 丰田自动车株式会社 | Method and apparatus for producing fiber-reinforced resin molded article |
| CN113211827B (en) * | 2020-01-21 | 2023-02-17 | 丰田自动车株式会社 | Method and apparatus for producing fiber-reinforced resin molded article |
| CN113119492A (en) * | 2021-04-13 | 2021-07-16 | 山东医学高等专科学校 | Preparation method of marine propeller blade fiber reinforced composite material |
| CN115257012A (en) * | 2022-08-15 | 2022-11-01 | 博材智能科技(东台)有限公司 | Hot press forming device for carbon fiber composite material |
| CN115257012B (en) * | 2022-08-15 | 2023-10-27 | 博材智能科技(东台)有限公司 | Hot briquetting device of carbon fiber composite |
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Application publication date: 20180907 |