CN112248484A - Novel quick forming die of continuity carbon fiber automobile parts - Google Patents
Novel quick forming die of continuity carbon fiber automobile parts Download PDFInfo
- Publication number
- CN112248484A CN112248484A CN202011098793.7A CN202011098793A CN112248484A CN 112248484 A CN112248484 A CN 112248484A CN 202011098793 A CN202011098793 A CN 202011098793A CN 112248484 A CN112248484 A CN 112248484A
- Authority
- CN
- China
- Prior art keywords
- carbon fiber
- metal structural
- prepreg
- die
- automobile
- 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.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- 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
-
- 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
- B29C70/545—Perforating, cutting or machining during or after moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0872—Prepregs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
- B29K2105/101—Oriented
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
Abstract
The invention discloses a novel continuous carbon fiber automobile part rapid forming die which comprises a thin-wall opening structural part, a carbon fiber reinforcing part, an upper die, a lower die and an air bag. The thin-wall opening structural part is manufactured by adopting the processes of stamping, extruding and rolling; the prepreg is prepared by combining a continuous carbon filament braided fabric and thermosetting resin; the air bag is made of soft materials with high elongation. And (2) taking the automobile metal structural part as a matrix, paving and pasting the carbon fiber prepreg on the metal structural part, then putting the metal structural part into the mould for heating and pressurizing, and curing and forming to form the reinforced automobile structural part assembly. The carbon fiber composite material can be used for reinforcing a metal structural member, realizing large-scale light weight and fast production rhythm, meeting the requirement of mass production in the automobile industry, and compared with other carbon fiber automobile part forming processes, the carbon fiber composite material has the advantages of low mold cost, low manufacturing cost, no need of rear end assembly, reduced assembly cost and the like, and can be widely applied to the automobile industry.
Description
Technical Field
The invention relates to a novel continuous carbon fiber automobile part rapid forming die.
Background
With the increasing national requirements on energy conservation and emission reduction of automobiles, the light weight of automobiles is a weight means for energy conservation and emission reduction in the automobile industry at present. The weight of the automobile body, chassis, power assembly and the like is very high in the weight and specific gravity of the whole automobile, the lightweight technology of the automobile body, chassis and power assembly is continuously developed and advanced, the new technology and new process from high-strength steel and light alloy to composite material are continuously updated, and the automobile body, chassis and power assembly is gradually developed from early all-steel materials to the existing multiple-material mixed design.
The application of the carbon fiber composite material in the automobile industry is rapidly developing, various carbon fiber manufacturing processes such as prepreg molding, HP-RTM, WCM, autoclave and the like can manufacture various automobile structural parts and covering parts, however, the processes mainly manufacture monomer carbon fiber parts, then the monomer carbon fiber parts are assembled with other parts of an automobile body, structural glue is adopted for bonding or riveting, the assembly cost is high, the production takt of the HP-RTM and WCM processes is high, but the costs of materials, molds, equipment and the like are high, the product cost is high, the large-scale popularization of the automobile industry cannot be realized, the production cycle of the prepreg molding and autoclave processes is long, and the requirement of mass production cannot be met.
Disclosure of Invention
The invention aims to provide a novel continuous carbon fiber automobile part rapid forming die, and aims to provide a carbon fiber reinforced solution for an automobile structural part, reduce the weight of the whole automobile, and improve the rigidity and safety performance of the whole automobile. And provides a low-cost production technology which can meet the requirement of mass production in the automobile industry.
In order to solve the above problems, the present invention adopts the following method:
the utility model provides a novel continuity carbon fiber automobile parts rapid prototyping mould which characterized in that comprises following structure: the structure comprises a thin-wall opening structural part (3), a carbon fiber reinforcing part (4), an upper die (1), a lower die (2) and an air bag (5).
Specifically, the thin-wall opening structural part (3) is manufactured by adopting the processes of stamping, extruding and rolling;
the carbon fiber reinforcement member (4) is subjected to pre-treatment of a prepreg, and the prepreg is prepared by combining a continuous carbon wire braided fabric and thermosetting resin;
the air bag (5) is made of soft material with high elongation.
Furthermore, the original shape of the air bag (5) is similar to that of the metal structural part (3), the air bag is not contacted with the metal structural part (3) when the upper die and the lower die are closed, the outer edge of the air bag (5) is embedded into the groove of the upper die (1) to form a closed cavity with the upper die (1), and the upper die (1) is provided with an air inlet and an air outlet.
Further, the lower die (2) is made of common steel, the cavity of the lower die is molded to the metal structural part (3) in a copying mode, a certain proportion is enlarged on the basis of the metal structural part (3), the metal structural part (3) can be conveniently placed into and taken out, the lower die (2) is provided with heating holes in the periphery of the molding surface of the cavity, and an oil heating or electric heating mode is adopted.
A novel method for preparing automobile parts by using a continuous carbon fiber automobile part rapid forming die is characterized by comprising the following steps:
the method comprises the following steps of performing surface roughening treatment on a metal structural part (3), simultaneously performing prepreg cutting blanking on a carbon fiber reinforcing part (4), paving the carbon fiber reinforcing part (4) after cutting at a position corresponding to the metal structural part (3), and fixing the prepreg without auxiliary equipment due to certain viscosity of the prepreg;
putting a metal structural part (3) paved with a prepreg carbon fiber reinforcing part (4) into a lower die (2), continuously heating a heating hole of the lower die (2) to keep the temperature of the profiling surface of the lower die (2) at the curing temperature of the prepreg, immediately closing an upper die (1) and the lower die (2) after the metal structural part (3) is put into the lower die (2), simultaneously filling high-pressure gas into the upper die (1), forcing an air bag (5) to expand by the high-pressure gas, and attaching the air bag to the carbon fiber reinforcing part (4) formed by the prepreg, so that the carbon fiber reinforcing part (4) is subjected to uniform pressure (the air pressure is set according to the curing characteristic and the temperature of resin) and is attached to the metal structural part (3);
and opening an exhaust port of the upper die (1), removing high-pressure air, then opening the die, taking out the metal structural part (3), and at the moment, curing and forming the carbon fiber reinforcing part (4) and bonding the carbon fiber reinforcing part and the metal structural part (3) together to form a part assembly.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural diagram of the present invention.
The reference numbers in the figures are: 1. the air bag structure comprises an upper die, 2 parts of a lower die, 3 parts of a metal structural part, 4 parts of a carbon fiber reinforcing part, 5 parts of an air bag, 1-1 part of an air inlet, 1-2 parts of an air outlet.
Detailed Description
The metal structural part (3) is a thin-wall opening structural part manufactured by adopting processes of stamping, extruding, rolling and the like, the part is made of steel or aluminum alloy, for example, the automobile body structural part comprises an A column, a B column, a C column, a threshold beam, a middle channel, a cross beam, a longitudinal beam and the like, and the automobile chassis part comprises a steel stamping lower swing arm, a stamping auxiliary frame and the like. The carbon fiber reinforcing part (4) is a reinforcing structural part which is formed by heating, pressurizing and curing prepreg combined by continuous carbon wire braided fabric (or carbon fiber and other fibers in a mixed way or other fibers in a braided way) and thermosetting resin, and the reinforcing structural part is completely attached to the metal structural part (3) to form a structural part assembly with higher rigidity and strength. According to the performance requirements of the automobile, the paving direction and the paving quantity of the carbon fiber reinforcement piece (4) can be flexibly designed, and different paving quantities can be realized at different positions.
The upper die (1), the lower die (2), the air bag (5) is a component of a die in a rapid forming technology, the upper die (1) is a cover plate made of common steel, the air bag (5) is made of soft materials with higher elongation rate (such as silica gel), the original shape of the air bag (5) is close to the metal structural member (3) and is not contacted with the metal structural member (3) when the upper die and the lower die are closed, the outer edge of the air bag (5) is embedded into a groove of the upper die (1) to form a closed cavity with the upper die (1), the upper die (1) is provided with an air inlet (1-1) and an air outlet (1-2), the lower die (2) is made of common steel, the cavity is molded with the metal structural member (3), and is enlarged to a certain proportion on the basis of the metal structural member (3), so as to ensure that the metal structural member (3) can be conveniently put in and taken out, the lower die (2) is provided with heating holes at the periphery of the cavity profiling surface and adopts an oil heating or electric heating mode.
The preparation process comprises the following steps: the method comprises the steps of roughening the surface of a metal structural part (3), cutting and blanking prepreg required by a carbon fiber reinforcing part (4), paving the prepreg at a corresponding position of the metal structural part (3) after cutting, continuously heating a heating hole of a lower die (2) to keep the profiling surface of the lower die (2) at a required temperature (the temperature is set according to the curing temperature requirement of the prepreg) without auxiliary equipment, putting the paved metal structural part (3) into the lower die (2), immediately closing the upper die (1) and the lower die (2) after the metal structural part (3) is put into the lower die (2), simultaneously filling high-pressure gas into the upper die (1) through a gas inlet (1-1), forcing an air bag (5) to expand by the high-pressure gas, and attaching the air bag to the carbon fiber reinforcing part (4) formed by the prepreg, so that the carbon fiber reinforcement (4) is subjected to uniform pressure (air pressure is set according to the curing characteristics and temperature of the resin) and is applied to the metal structural member (3). After a certain time (the time is set according to the curing characteristic and the temperature of the resin), opening an exhaust port (1-2) of the upper die (1), removing high-pressure air, then opening the die, and taking out the metal structural part (3), wherein the carbon fiber reinforcing part (4) is cured and molded and is bonded with the metal structural part (3) to form a part assembly.
In a word, the carbon fiber structure reinforcing scheme realizes that the thickness and the size of the metal structural member can be reduced, the integral rigidity, the integral strength and the like are improved, and the integral weight is reduced by pasting the carbon fiber composite material on the surface of the metal structural member. In the manufacturing process, use metal structure as the parent, directly paste prepreg and apply metal structure on, because the mould keeps the problem that lasts high, can guarantee that metal structure puts into the mould after the temperature that rises fast needs, the air pocket makes prepreg and metal structure laminating and solidification shaping through even high pressure simultaneously, can realize the hot effect of advancing and telling, the very high production speed of assurance, and reduce the process in the manufacturing process, the manufacturing cost who reduces, carbon fiber reinforcement (4) are direct and metal structure (3) keep the bonding state along with metal structure (3) shaping back, need not the assembly process of rear end, the production uniformity of improvement, reduce production processes, and the production cost is reduced.
Claims (5)
1. The utility model provides a novel continuity carbon fiber automobile parts rapid prototyping mould which characterized in that comprises following structure: thin wall opening structure, carbon fiber reinforcement, upper die, lower die, air pocket.
2. The novel continuous carbon fiber automobile part rapid forming die as claimed in claim 1, wherein the thin-walled open structure is manufactured by stamping, extruding and rolling processes;
the carbon fiber reinforcement is subjected to pre-treatment of a prepreg, and the prepreg is prepared by combining a continuous carbon wire braided fabric and thermosetting resin;
the air bag is made of soft materials with high elongation.
3. The novel continuous carbon fiber automobile part rapid prototyping mold of any one of claims 1 or 2 wherein the original shape of the air bag is similar to the metal structure and does not contact the metal structure when the upper and lower molds are closed, the outer edge of the air bag is inserted into the groove of the upper mold to form a closed cavity with the upper mold, and the upper mold is provided with air inlet holes and air outlet holes.
4. The novel continuous carbon fiber automobile part rapid forming die as claimed in claim 1, wherein the lower die is made of common steel, the cavity of the lower die is shaped like a metal structural member, the metal structural member is enlarged in a certain proportion on the basis of the metal structural member to ensure that the metal structural member can be conveniently put in and taken out, the lower die is provided with heating holes at the periphery of the shaped surface of the cavity, and the oil heating or electric heating mode is adopted.
5. A method for preparing automobile parts by using the novel continuous carbon fiber automobile part rapid forming die as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
the method comprises the following steps of performing surface roughening treatment on a metal structural part, simultaneously performing prepreg cutting blanking on a carbon fiber reinforcing part, and paving the carbon fiber reinforcing part after cutting to a corresponding position of the metal structural part, wherein the prepreg has certain viscosity and does not need auxiliary equipment to fix the prepreg;
placing a metal structural part paved with a prepreg carbon fiber reinforcing part into a lower die, continuously heating a heating hole of the lower die to keep the temperature of the profiling surface of the lower die at the curing temperature of the prepreg, immediately closing the upper die and the lower die after the metal structural part is placed into the lower die, simultaneously filling high-pressure gas into the upper die, forcing the air bag to expand by the high-pressure gas, attaching the air bag to the carbon fiber reinforcing part formed by the prepreg, and attaching the carbon fiber reinforcing part to the metal structural part under uniform pressure (the air pressure is set according to the curing characteristic and the temperature of resin);
and opening an exhaust port of the upper die, exhausting high-pressure air, then opening the die, taking out the metal structural member, and at the moment, curing and forming the carbon fiber reinforcing member and bonding the carbon fiber reinforcing member and the metal structural member together to form a part assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011098793.7A CN112248484A (en) | 2020-10-14 | 2020-10-14 | Novel quick forming die of continuity carbon fiber automobile parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011098793.7A CN112248484A (en) | 2020-10-14 | 2020-10-14 | Novel quick forming die of continuity carbon fiber automobile parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112248484A true CN112248484A (en) | 2021-01-22 |
Family
ID=74242434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011098793.7A Pending CN112248484A (en) | 2020-10-14 | 2020-10-14 | Novel quick forming die of continuity carbon fiber automobile parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112248484A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113997603A (en) * | 2021-11-17 | 2022-02-01 | 安徽皓翔航空科技有限公司 | Carbon fiber composite material U-shaped frame, U-shaped frame forming die and forming method |
| CN114043746A (en) * | 2021-11-15 | 2022-02-15 | 北京计算机技术及应用研究所 | Metal-containing embedded part carbon fiber shell forming method based on vacuum introduction process |
| CN114054574A (en) * | 2021-10-25 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | Thin-wall T-shaped rib characteristic local reinforcement forming method based on flexible liquid filling |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440853A (en) * | 2002-02-27 | 2003-09-10 | 复盛股份有限公司 | Making process of very large golf club head |
| CN107310082A (en) * | 2016-04-26 | 2017-11-03 | 上海怡鑫碳纤维复合材料有限公司 | The method for making air passenger seat carbon fibre composite product |
-
2020
- 2020-10-14 CN CN202011098793.7A patent/CN112248484A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440853A (en) * | 2002-02-27 | 2003-09-10 | 复盛股份有限公司 | Making process of very large golf club head |
| CN107310082A (en) * | 2016-04-26 | 2017-11-03 | 上海怡鑫碳纤维复合材料有限公司 | The method for making air passenger seat carbon fibre composite product |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114054574A (en) * | 2021-10-25 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | Thin-wall T-shaped rib characteristic local reinforcement forming method based on flexible liquid filling |
| CN114043746A (en) * | 2021-11-15 | 2022-02-15 | 北京计算机技术及应用研究所 | Metal-containing embedded part carbon fiber shell forming method based on vacuum introduction process |
| CN113997603A (en) * | 2021-11-17 | 2022-02-01 | 安徽皓翔航空科技有限公司 | Carbon fiber composite material U-shaped frame, U-shaped frame forming die and forming method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112248484A (en) | Novel quick forming die of continuity carbon fiber automobile parts | |
| CN102173060B (en) | Device and method for manufacturing carbon fiber reinforced composite construction member | |
| CN103464714B (en) | A kind of liquid casting and forging molding method of automotive brake clamp and device | |
| CN102765198A (en) | Vacuum assisted molding system of composite and molding method of composite | |
| CN106553357A (en) | Hollow multi-cavity abnormal shape surface composite material complex structural member integral forming technique | |
| GB2502651A (en) | Press moulding method | |
| CN107521124A (en) | Carbon fiber dual platen reinforced structure part and its manufacture method | |
| CN209191346U (en) | Manufacture the molding die of large-scale unmanned plane rib | |
| CN102407884A (en) | Automobile body part and production method thereof | |
| CN109367071B (en) | Production method of fiber reinforced composite ejection push arm | |
| CN104290337A (en) | Method for realization of co-cementing of reinforcing rib web composite produced part by accurate positioning soft tooling | |
| CN108437490A (en) | A kind of carbon fibre composite skylight reinforcement plate producing process | |
| CN109693399A (en) | Pressing shaping device and its method in carbon fiber prepreg mould | |
| CN104527201A (en) | Carbon fiber sandwich gauge framework and manufacturing method thereof | |
| CN114074436B (en) | Composite control arm for vehicle and forming method thereof | |
| CN110281547A (en) | A method of realizing deep camber Ω type Material Stiffened Panel co-curing | |
| CN110103489A (en) | A kind of melting adhered forming method of High Performance Thermoplastic Composites I-beam | |
| CN206999679U (en) | Carbon fiber dual platen reinforced structure part | |
| CN107672135B (en) | A kind of injection extruding integrated molding method that edge of transparent is strengthened | |
| CN105835301A (en) | Rapid vulcanization forming process for rubber parts, and die | |
| CN114103163A (en) | Integral manufacturing method of special-shaped carbon fiber horn of rotor unmanned aerial vehicle | |
| CN107696522A (en) | A kind of carbon fibre fabric method for forming parts at band R angles | |
| CN109486117B (en) | Automobile part and preparation method thereof | |
| CN112936909A (en) | Forming process of thickened V-shaped composite material part at bottom of trainer | |
| CN111284056B (en) | Forming process method for upper cover of battery box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210122 |
|
| WD01 | Invention patent application deemed withdrawn after publication |