CN109454902A - The preparation method and applications of carbon fiber battery pack housing - Google Patents
The preparation method and applications of carbon fiber battery pack housing Download PDFInfo
- Publication number
- CN109454902A CN109454902A CN201811326105.0A CN201811326105A CN109454902A CN 109454902 A CN109454902 A CN 109454902A CN 201811326105 A CN201811326105 A CN 201811326105A CN 109454902 A CN109454902 A CN 109454902A
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- CN
- China
- Prior art keywords
- battery pack
- carbon fiber
- pack housing
- preparation
- fiber battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a kind of preparation method and applications of carbon fiber battery pack housing, and the preparation method comprises the following steps: (1) fabric prepares: carbon fibre fabric is loaded by laying information to material volume roller；(2) fabric cuts and welds: the carbon fibre fabric on different material volume rollers being unreeled and is stacked, a monolith block is welded into, unloads material containing block；(3) preforming: material block being put into after heating platform preheated, is put into preforming press, molds, edge excess fabric is dismissed in cold pressing, and precast body is made；(4) precast body enters mould: crawl precast body is put into HP-RTM mold；(5) molding and injecting glue: HP-RTM mold is subjected to molding and injecting glue, (6) solidification: is heating and curing and is processed into product；(7) demould: the molding after product solidification takes out product, that is, carbon fiber battery pack housing is made；Whole process realizes full-automatic production, and productive temp is short, can reach automobile industry component productive temp grade.
Description
Technical field
The present invention relates to carbon fiber battery pack housing fields, especially with regard to a kind of preparation of carbon fiber battery pack housing
Method and its application.
Background technique
Automotive light weight technology refers to that under the premise of guaranteeing automobile integral strength and security performance, mitigation automobile as far as possible is whole
Quality reduce energy consumption to reduce exhaust pollution to improve the dynamic property of automobile.Automotive light weight technology has become at present
A key technique of automobile R&D process in global range.Wherein, it is quickly sent out under environment and energy Double jeopardy
The pure electric automobile of exhibition, since battery durable ability is unable to satisfy consumer's daily demand, it has also become new-energy automobile is quickly sent out
The maximum resistance of exhibition.Therefore, pure electric automobile more needs to make up the deficiency of present power battery using Lightweight Technology, mentions
Rise its competitiveness in the market.
Power battery pack housing generallys use more than one piece metal plate punching welding molding, and production technology is complicated, manufacturing cost compared with
Height, and use thick and heavy cabinet more, increase vehicle body total quality.Therefore, meeting the basic performances such as battery pack housing waterproof, collision
On the basis of it is required that, it would be highly desirable to carry out light-weight design to battery pack housing, promote the fast development of electric car.Carbon is used at present
Fibrous composite realizes that battery pack housing lightweight scheme is more, and in certain sample car practical applications.
Carbon fiber battery pack housing scheme has using traditional handicrafts such as Shooting Technique, low pressure RTM, VARI at present, wherein infusing
Technique is moulded using product is made after heating melting injection mold cured after the hybrid process such as carbon fiber, resin, filler, selects and is chopped
Carbon fiber, intensity is lower, is unable to satisfy higher mechanical property requirement.Can sufficiently it be met using continuous fiber reinforcement battery pack housing
Mechanical property needed for product, low pressure RTM, VARI are all made of continuous carbon fibre fabric injection resin and are heating and curing molding.
Low pressure RTM whole operation process automation degree is low, and production efficiency is low, and personnel's operation influence factor is larger,
Cause product quality homogeneity poor.Battery pack housing leads components as automobile, and productive temp need to be with other metal parts
It is just unanimously able to satisfy production requirement, and should ensure that product quality homogeneity, low pressure RTM technique major defect has:
(1) carbon fiber laying process need to be successively coated with, and be taken a long time, and personnel are coated with technology difference leads to product quality not
?；
(2) air in mold/pipeline need to be discharged for injecting glue process, and the resin after overflow in plastic emitting pipeline stops after not having bubble
Only injecting glue, entire beat time-consuming 20-60min, and not can guarantee and bubble is discharged completely, product surface existing defects risk；
(3) demoulding needs after the solidification is complete, when mold temperature is down to 60 DEG C or less, to be demoulded；Due to mold heating, drop
Warm process takes a long time, and seriously affects productive temp.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation method and applications of carbon fiber battery pack housing, the preparation methods
It uses HP-RTM (that is, high-pressure resin Transfer molding, High Pressure Resin Transfer Molding) work
Skill, whole process realizes full-automatic production, and productive temp is short, can reach automobile industry component productive temp grade.
To achieve the above object, the present invention provides a kind of preparation methods of carbon fiber battery pack housing, including following step
Rapid: (1) fabric prepares: carbon fibre fabric is loaded by laying information to material volume roller；(2) fabric cuts and welds: will be different
Carbon fibre fabric on material volume roller unreel stack, head end be aligned in sanction material table top expansion cut, and by ultra-sonic welding techniques general
Carbon fibre fabric after cutting is welded into the material block an of entirety, unloads the material block；(3) preforming: the material block is put
Enter heating platform to be preheated so that the adhesive on material block surface melts, with manipulator take out the material block be put into it is pre- at
In swaging machine, molding is cold-pressed, and is put into post-processing work with the material block that manipulator takes out in preforming press after precompressed
It loads onto, dismisses the extra fabric in edge, precast body is made；(4) precast body enters mould: the precast body is put into molding feeding area,
The precast body is grabbed by manipulator to be put into HP-RTM mold；(5) molding and injecting glue: by the HP-RTM mold clamping,
It vacuumizes, and resin, curing agent and the inner pattern releasing agent applicable after preheating is injected into the HP-RTM mold by way of mixing and glue injection
It is interior, wherein the mass ratio of the resin, curing agent and inner pattern releasing agent applicable is followed successively by 100:(25-29): (1-2)；(6) solidify: to institute
Precast body is stated in the HP-RTM mold after molding, locking and injecting glue, is further processed into production by being heating and curing
Product, wherein the HP-RTM mold by apply coupling mechanism force locked, specific coupling mechanism force size can according to product structure,
Size carries out calculating determination；And (7) demoulding: the molding after product solidification takes out the product, that is, the carbon fiber is made
Tie up battery pack housing.
In a preferred embodiment, in the step (3), the material block is put into heating platform and is preheated to 180 DEG C
~220 DEG C melt the adhesive on material block surface.
In a preferred embodiment, in the step (3), the temperature in the preforming press is 60 DEG C~70
℃。
In a preferred embodiment, in the step (5), the resin is produced using flame-retarded resin with meeting
The requirement of product service performance.
In a preferred embodiment, in the step (5), the resin includes epoxy systems and polyurethane system,
Corresponding curing agent and inner pattern releasing agent applicable is added according to the type of the resin.
In a preferred embodiment, in the step (5), mixing and glue injection speed is 20-40g/s, when mixing and glue injection
Injection pressure be 90~150Bar.
In a preferred embodiment, in the step (6), solidification temperature is 110 DEG C~120 DEG C, and curing time is
2min~4min.
In a preferred embodiment, the production of the preparation method production single product of the carbon fiber battery pack housing
Period is no more than 6min.
The present invention also provides a kind of carbon fiber battery pack housing, the carbon fiber battery pack housing is by above-mentioned carbon fiber
It is come out prepared by the preparation method of dimension battery pack housing.
The present invention also provides the preparation methods of above-mentioned carbon fiber battery pack housing or above-mentioned carbon fiber battery pack housing to exist
Application in electric automobiles.
Compared with prior art, the invention has the following beneficial effects:
(1) preparation method of carbon fiber battery pack housing according to the present invention realizes full-automatic production, single product
Productive temp can be reduced within 6min；
(2) preparation method of carbon fiber battery pack housing according to the present invention passes through under high pressure that resin is quick
Full of die cavity, reduce the injecting glue time, and improve the quality of layup, make product have brilliant surface property and
Quality；
(3) the carbon fiber battery pack that the preparation method of related carbon fiber battery pack housing is produced through the invention
The thickness and dimensional discrepancy of shell are low, have high technology stability and repeatability.
Detailed description of the invention
Fig. 1 is the flow chart of the preparation method of carbon fiber battery pack housing according to an embodiment of the present invention.
Main appended drawing reference explanation:
A: fabric prepares, B: cut and weld, C: merging preforming tool, D: preforming, E: precast body, F: precast body enters
Mould, G: molding and injecting glue, H: solidification, I: demoulding.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples, it is unless otherwise specified, commercially commercially available.
As shown in Figure 1, a kind of preparation method of carbon fiber battery pack housing according to the preferred embodiment of the present invention, including
Following steps: (1) fabric prepares: carbon fibre fabric is loaded by laying information to material volume roller；(2) fabric cuts and welds:
Carbon fibre fabric on different material volume rollers is unreeled stack, head end is aligned in sanction material table top expansion and cuts, and pass through ultrasonic welding
Carbon fibre fabric after cutting is welded into the material block an of entirety by technology, unloads the material block；(3) preforming: will be described
Material block is put into heating platform and is preheated, so that the adhesive on material block surface melts, takes out the material block with manipulator and puts
Enter in preforming press, mold, be cold-pressed, after being put into material block of the manipulator taking-up in preforming press after precompressed
It handles in tooling, dismisses the extra fabric in edge, precast body is made；(4) precast body enters mould: the precast body is put into molding
Expect area, the precast body is grabbed by manipulator and is put into HP-RTM mold；(5) molding and injecting glue: by the HP-RTM mold
It molds, vacuumize, and resin, curing agent and the inner pattern releasing agent applicable after preheating are injected into the HP-RTM by way of mixing and glue injection
In mold, wherein the mass ratio of the resin, curing agent and inner pattern releasing agent applicable is followed successively by 100:(25-29): (1-2)；(6) solidify:
After the precast body in the HP-RTM mold after molding, locking and injecting glue, be further processed by being heating and curing
For product, wherein the HP-RTM mold is locked by applying coupling mechanism force, and specific coupling mechanism force size can be according to product knot
Structure, size carry out calculating determination；And (7) demoulding: the product is taken out in the molding after product solidification, that is, is made described
Carbon fiber battery pack housing.
As a kind of preferred embodiment, in the step (3), by the material block be put into heating platform be preheated to 180 DEG C~
220 DEG C melt the adhesive on material block surface.
As a kind of preferred embodiment, in the step (3), the temperature in the preforming press is 60 DEG C~70 DEG C.
As a kind of preferred embodiment, in the step (5), the resin is using flame-retarded resin, to meet product
The requirement of service performance.
In a preferred embodiment, in the step (5), the resin includes epoxy systems and polyurethane system,
Corresponding curing agent and inner pattern releasing agent applicable is added according to the type of the resin.
As a kind of preferred embodiment, in the step (5), mixing and glue injection speed is 20-40g/s, when mixing and glue injection
Injection pressure is 90~150Bar.
As a kind of preferred embodiment, in the step (6), solidification temperature is 110 DEG C~120 DEG C, and curing time is
2min~4min.
As a kind of preferred embodiment, the production week of the preparation method production single product of the carbon fiber battery pack housing
Phase is no more than 6min.
A kind of carbon fiber battery pack housing according to the preferred embodiment of the present invention, the carbon fiber battery pack housing is logical
The preparation method for crossing above-mentioned carbon fiber battery pack housing prepared comes out.
The preparation method of above-mentioned carbon fiber battery pack housing according to the preferred embodiment of the present invention or above-mentioned carbon fiber electrically
Application of the pond pack housing in electric automobiles.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (10)
1. a kind of preparation method of carbon fiber battery pack housing, which comprises the following steps:
(1) fabric prepares: carbon fibre fabric is loaded by laying information to material volume roller；
(2) fabric cut and welding: the carbon fibre fabric on different material volume rollers is unreeled stack, head end be aligned in sanction material table top exhibition
It opens and cuts, and the carbon fibre fabric after cutting is welded into the material block an of entirety by ultra-sonic welding techniques, described in unloading
Expect block；
(3) preforming: the material block being put into heating platform and is preheated, so that the adhesive on material block surface melts, is used
Manipulator takes out the material block and is put into preforming press, molds, is cold-pressed, and is taken out with manipulator and is passed through in preforming press
Material block after crossing precompressed is put on post-treatment tool, dismisses the extra fabric in edge, and precast body is made；
(4) precast body enters mould: the precast body being put into molding feeding area, the precast body is grabbed by manipulator and is put into HP-
In RTM mold；
(5) it molding and injecting glue: by the HP-RTM mold clamping, vacuumizes, and by resin, curing agent and the interior demoulding after preheating
Agent is injected by way of mixing and glue injection in the HP-RTM mold, wherein the quality of the resin, curing agent and inner pattern releasing agent applicable
Than being followed successively by 100:(25-29): (1-2)；
(6) solidify: after the precast body in the HP-RTM mold after molding, locking and injecting glue, further by plus
Product is processed into heat cure, wherein the HP-RTM mold is locked by applying coupling mechanism force；And
(7) demould: the molding after product solidification takes out the product, that is, the carbon fiber battery pack housing is made.
2. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that, will in the step (3)
The material block, which is put into heating platform and is preheated to 180 DEG C~220 DEG C, melts the adhesive on material block surface.
3. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that in the step (3), institute
Stating the temperature in preforming press is 60 DEG C~70 DEG C.
4. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that in the step (5), institute
Resin is stated using flame-retarded resin.
5. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that in the step (5), institute
Stating resin includes epoxy systems and polyurethane system.
6. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that in the step (5), mix
Conjunction injecting glue speed is 20-40g/s, and injection pressure when mixing and glue injection is 90~150Bar.
7. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that in the step (6), Gu
Changing temperature is 110 DEG C~120 DEG C, and curing time is 2min~4min.
8. the preparation method of carbon fiber battery pack housing as described in claim 1, which is characterized in that the carbon fiber battery pack
The production cycle of the preparation method production single product of shell is no more than 6min.
9. a kind of carbon fiber battery pack housing, which is characterized in that the carbon fiber battery pack housing is appointed by claim 1-8
It is come out prepared by the preparation method of carbon fiber battery pack housing described in one.
10. preparation method or carbon as claimed in claim 9 such as the described in any item carbon fiber battery pack housings of claim 1-8
Application of the fibre cell pack housing in electric automobiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811326105.0A CN109454902A (en) | 2018-11-08 | 2018-11-08 | The preparation method and applications of carbon fiber battery pack housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811326105.0A CN109454902A (en) | 2018-11-08 | 2018-11-08 | The preparation method and applications of carbon fiber battery pack housing |
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| Publication Number | Publication Date |
|---|---|
| CN109454902A true CN109454902A (en) | 2019-03-12 |
Family
ID=65609797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811326105.0A Pending CN109454902A (en) | 2018-11-08 | 2018-11-08 | The preparation method and applications of carbon fiber battery pack housing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110561674A (en) * | 2019-09-29 | 2019-12-13 | 苏州银禧新能源复合材料有限公司 | Electric motor car battery box upper cover molding system |
| CN111907092A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | RTM (resin transfer molding) method for sandwich structure of automobile composite material battery box |
| CN112406133A (en) * | 2020-09-22 | 2021-02-26 | 合肥兴海元能源科技有限公司 | High-temperature high-pressure RTM (resin transfer molding) method for new energy automobile battery upper cover |
| CN112497786A (en) * | 2020-12-03 | 2021-03-16 | 江苏亨睿碳纤维科技有限公司 | Forming method and die for carbon fiber automobile parts |
| CN112829336A (en) * | 2020-12-30 | 2021-05-25 | 广联航空工业股份有限公司 | Manufacturing method of Kevlar electronic product protective shell with shockproof function |
| CN113067084A (en) * | 2021-03-15 | 2021-07-02 | 四川长虹电源有限责任公司 | Carbon fiber composite material battery shell |
| CN116714282A (en) * | 2023-08-10 | 2023-09-08 | 中国汽车技术研究中心有限公司 | Method for preparing integrated composite battery box shell based on compression stroke of die |
| CN116728841A (en) * | 2023-08-10 | 2023-09-12 | 中国汽车技术研究中心有限公司 | Method for preparing fiber composite material based on compression stroke of mold |
-
2018
- 2018-11-08 CN CN201811326105.0A patent/CN109454902A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110561674A (en) * | 2019-09-29 | 2019-12-13 | 苏州银禧新能源复合材料有限公司 | Electric motor car battery box upper cover molding system |
| CN111907092A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | RTM (resin transfer molding) method for sandwich structure of automobile composite material battery box |
| CN112406133A (en) * | 2020-09-22 | 2021-02-26 | 合肥兴海元能源科技有限公司 | High-temperature high-pressure RTM (resin transfer molding) method for new energy automobile battery upper cover |
| CN112497786A (en) * | 2020-12-03 | 2021-03-16 | 江苏亨睿碳纤维科技有限公司 | Forming method and die for carbon fiber automobile parts |
| CN112829336A (en) * | 2020-12-30 | 2021-05-25 | 广联航空工业股份有限公司 | Manufacturing method of Kevlar electronic product protective shell with shockproof function |
| CN113067084A (en) * | 2021-03-15 | 2021-07-02 | 四川长虹电源有限责任公司 | Carbon fiber composite material battery shell |
| CN116714282A (en) * | 2023-08-10 | 2023-09-08 | 中国汽车技术研究中心有限公司 | Method for preparing integrated composite battery box shell based on compression stroke of die |
| CN116728841A (en) * | 2023-08-10 | 2023-09-12 | 中国汽车技术研究中心有限公司 | Method for preparing fiber composite material based on compression stroke of mold |
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