CN110861318A - Carbon fiber automobile front floor compression molding method - Google Patents
Carbon fiber automobile front floor compression molding method Download PDFInfo
- Publication number
- CN110861318A CN110861318A CN201911028830.4A CN201911028830A CN110861318A CN 110861318 A CN110861318 A CN 110861318A CN 201911028830 A CN201911028830 A CN 201911028830A CN 110861318 A CN110861318 A CN 110861318A
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- China
- Prior art keywords
- carbon fiber
- front floor
- prepreg
- automobile front
- compression molding
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- 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
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of traffic facilities, and relates to a carbon fiber automobile front floor compression molding method, which takes carbon fiber prepreg as a molding material and takes a prepreg compression molding process as a basis to realize the following compression molding method: cutting the prepreg; maintaining the mold; laying and pasting prepreg: paving and sticking the cut prepreg layer by layer according to a designed laying area and a laying angle, wherein the prepreg is 12K carbon fiber and unidirectional tape prepreg; and (5) carrying out die assembly, pressurization, temperature rise and demolding after solidification. Compared with the existing forming process, the invention does not need to use auxiliary materials, has no air tightness requirement and is environment-friendly in production; the carbon fiber automobile front floor body manufactured by the method has good appearance quality, no defect exists in corner areas, and the product thickness and the molded surface tolerance in different areas meet the requirements.
Description
Technical Field
The invention belongs to the technical field of traffic facilities, and relates to a carbon fiber front floor compression molding method for an automobile.
Background
At present, most of front floors common in the automobile industry are made of metal materials, are integrally punched and formed and are also formed by block punching and then assembled, and with the rapid development of new energy automobiles, the weight reduction of automobile bodies becomes a key point, so that carbon fibers are increasingly applied to automobile body parts, wherein the front floor body is used as a main bearing part and is manufactured by using the conventional forming process methods such as VARI (vacuum induced plasticity), RTM (resin transfer molding) and the like, and the forming process methods are approximately dry fiber cloth laying and liquid resin introduction and then curing forming; the VARI forming process method needs to use various auxiliary materials, such as demolding cloth, a porous isolating membrane, a flow guide net, an injection pipe, a vacuum bag, a sealing adhesive tape and the like, and the RTM forming process method needs to use the auxiliary materials, such as the injection pipe, the vacuum pipe and the like, which are disposable and non-recyclable, so that the production environment is not friendly; in addition, the air tightness requirement is strict in the resin introducing and curing processes, and once air leakage occurs, products are scrapped; the compression molding method adopted by the invention does not consider the problems at all, but the compression molded carbon fiber front floor body has two technical problems: the prepreg can not be lapped in the prepreg paving and pasting process, the thickness uniformity of different areas of a large special-shaped mould pressing part is uniform, the corner area is free of defects, and the molded surface tolerance meets the requirement.
Disclosure of Invention
The purpose of the invention is: the invention provides a carbon fiber automobile front floor compression molding method, which aims to solve the technical problem.
In order to solve the technical problem, the technical scheme of the invention is as follows:
the carbon fiber automobile front floor compression molding method comprises the following steps of:
step one, cutting a prepreg: cutting the carbon fiber prepreg according to the designed appearance of the automobile front floor and the appearances of different paving areas;
step two, maintaining the mold;
step three, prepreg paving and pasting: paving and pasting the cut prepreg layer by layer according to the designed paving area and the paving angle;
step four, mold closing and pressurization;
step five, curing: heating the mould to the medium temperature and simultaneously curing;
step six, demolding: and after the solidification is finished, the mold is cooled to the medium-low temperature, and the solidified front floor body is demoulded.
The carbon fiber automobile front floor body adopts a completely symmetrical layer laying design. The adoption of the symmetrical layer laying design can avoid causing product deformation. The automobile front floor is an integrally formed non-uniform-thickness product, namely different layer numbers and different layer angles of the paving layer are designed according to the functional requirements of different areas.
The second step is specifically operated as follows: the cotton yarn is dipped in the release agent to uniformly coat the surfaces of the upper and lower forming dies for 2-4 times.
Step three, the prepreg paving operation is as follows: the prepreg is 12K carbon fiber or unidirectional tape prepreg; when the unidirectional tape is laid, the prepreg of the unidirectional tape is continuously not broken in the length direction, and is spliced in the width direction.
The prepreg of the unidirectional tape is not allowed to be broken in the length direction and is only allowed to be broken in the width direction, but the unidirectional tape is not allowed to be lapped and spliced, so that the phenomenon that the thickness of a product is poor or the quality defect inside the product is caused due to partial thickness of laying is avoided.
When the paving layer is paved, the paving direction of the outermost layer of the automobile front floor is 90 degrees, and the direction of the automobile head is 0 degree. The phenomenon of stacking of prepreg when the upper die and the lower die are closed is avoided;
when the reinforcing layer is paved, an infrared tracker is adopted to perform ray aiming at the positioning of the reinforcing layer paving area. The positioning accuracy is ensured.
And fifthly, selecting a medium-temperature curing resin system, wherein the curing time is 5-10 min.
The medium temperature is 130-150 ℃.
The medium and low temperature is 80-100 ℃. .
The invention has the beneficial effects that: compared with the existing molding process methods such as VARI, RTM and the like, the carbon fiber automobile front floor body compression molding method provided by the invention does not need to use auxiliary materials, has no air tightness requirement and is environment-friendly in production; the selection of the fast curing carbon fiber unidirectional tape prepreg has a plurality of advantages: firstly, the high-efficiency rhythm of the production in the automobile industry can be adapted, secondly, the prepreg of the unidirectional tape is spliced in the width direction, the fiber length direction is not broken, the strength of the product cannot be influenced, thirdly, the resin content is strictly controlled in the prepreg manufacturing process, and no lap joint amount exists in the paving and pasting process, so that the consistency of the weight and the thickness of the carbon fiber automobile front floor body manufactured by the compression molding method is better, fourthly, the performance of the unidirectional tape in the 0-degree direction is better than that of a fabric, and the product with the same strength requirement can be reduced in thickness if the unidirectional tape is used, and further, the weight reduction effect is more obvious; considering that the product deformation problem possibly occurs in a large special-shaped molded part, the carbon fiber automobile front floor body adopts a completely symmetrical layer laying design, a reinforced layer is designed aiming at a functional area, and an infrared tracker is used for accurate positioning, so that the carbon fiber automobile front floor body manufactured by the method has good appearance quality, no defect at corner areas, and the product thickness and the molded surface tolerance in different areas meet the requirements.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic external view of a front floor body of an automobile, wherein 1 is a functional area.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.
In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention. The invention relates to a compression molding method of a carbon fiber automobile front floor, which is applied to the compression molding manufacture of a certain automobile carbon fiber front floor body, as shown in figure 1, the fast curing carbon fiber unidirectional tape prepreg is cured at a medium temperature of 150 ℃, the carbon fiber is cured at 12K and the area density is cured at 200 g/square meter, the main equipment comprises a cutting machine, a press and an upper/lower molding die, and the compression molding method is realized as follows:
1, cutting a prepreg: cutting required multiple layers of rapidly solidified carbon fiber prepregs by using a cutting machine according to the external shape of the designed front floor body and the external shapes of different paving areas, wherein the paving angle of the prepregs is 90 degrees, 0 degrees, +45 degrees and-45 degrees;
2, maintaining the die: uniformly coating the surfaces of the upper and lower forming dies for 2-4 times by dipping cotton yarns with a release agent;
3, prepreg paving: as shown in fig. 1, the direction of the head of an automobile is 0 degree, the cut 12K carbon fibers and the unidirectional tape prepreg are laid and attached layer by layer according to the designed laying area and the laying angle, and the multilayer prepreg is designed into a fully symmetrical laying design; when the unidirectional tape is laid and pasted, the prepreg of the unidirectional tape is not allowed to be broken in the length direction and is only allowed to be broken in the width direction, but the unidirectional tape is not allowed to be lapped and is spliced, so that the phenomenon that the thickness of a product is out of tolerance or the internal quality of the product is defective due to partial thick laying is avoided; because the front floor has a complex appearance structure, in the paving and pasting process, vacuum compaction treatment is carried out at intervals of 5-7 layers, auxiliary materials such as demolding cloth, air guide felt, vacuum bag, sealing adhesive tape and the like are used for manufacturing a vacuum system, and the auxiliary materials can be repeatedly used for many times; functional area 1 is central access area, need do the enhancement layer and handle, and in order to ensure that local enhancement layer shop pastes the position accuracy, adopt infrared tracker to carry out the ray, and the outmost layer direction of spreading of preceding floor is 90 moreover, and the phenomenon of piling up appears in the preimpregnation material when avoiding upper and lower mould compound die.
4, mold closing: setting a press according to technological parameters, closing the die, pressurizing (0.4-1.0MPa), and heating;
5, curing: the mold is heated to a medium temperature (130 ℃ C. and 150 ℃ C.) and cured for about 5-10 min;
6, demolding: after the solidification is finished, the mold is cooled to the medium-low temperature (80-100 ℃), and the solidified front floor body is demoulded.
Through inspection, the appearance quality and the thickness tolerance of products in different areas of the front floor body product molded by the invention meet the requirements, and the corner area is free from defects. .
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (9)
1. A carbon fiber automobile front floor compression molding method is characterized in that: the carbon fiber automobile front floor compression molding method is characterized in that the carbon fiber automobile front floor is integrally molded, and the method comprises the following steps:
step one, cutting a prepreg: cutting the carbon fiber prepreg according to the designed appearance of the automobile front floor and the appearances of different paving areas;
step two, maintaining the mold;
step three, prepreg paving and pasting: paving and pasting the cut prepreg layer by layer according to the designed paving area and the paving angle;
step four, mold closing and pressurization;
step five, curing: heating the mould to the medium temperature and simultaneously curing;
step six, demolding: and after the solidification is finished, the mold is cooled to the medium-low temperature, and the solidified front floor body is demoulded.
2. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: the carbon fiber automobile front floor body adopts a completely symmetrical layer laying design.
3. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: the second specific operation is that cotton yarn is dipped in the release agent to uniformly coat the surfaces of the upper and lower forming dies for 2-4 times.
4. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: the third step of prepreg paving operation is as follows: the prepreg is 12K carbon fiber or unidirectional tape prepreg; when the unidirectional tape is laid, the prepreg of the unidirectional tape is continuously not broken in the length direction, and is spliced in the width direction.
5. The carbon fiber automobile front floor compression molding method according to claim 4, wherein: when the paving layer is paved, the paving direction of the outermost layer of the automobile front floor is 90 degrees, and the direction of the automobile head is 0 degree.
6. The carbon fiber automobile front floor compression molding method according to claim 4, wherein: when the reinforcing layer is paved, an infrared tracker is adopted to perform ray aiming at the positioning of the reinforcing layer paving area.
7. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: and fifthly, selecting a medium-temperature curing resin system, wherein the curing time is 5-10 min.
8. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: the medium temperature is 130-150 ℃.
9. The carbon fiber automobile front floor compression molding method according to claim 1, wherein: the medium and low temperature is 80-100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911028830.4A CN110861318A (en) | 2019-10-25 | 2019-10-25 | Carbon fiber automobile front floor compression molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911028830.4A CN110861318A (en) | 2019-10-25 | 2019-10-25 | Carbon fiber automobile front floor compression molding method |
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| CN110861318A true CN110861318A (en) | 2020-03-06 |
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| CN201911028830.4A Pending CN110861318A (en) | 2019-10-25 | 2019-10-25 | Carbon fiber automobile front floor compression molding method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111469936A (en) * | 2020-04-26 | 2020-07-31 | 中航复合材料有限责任公司 | Composite front floor single bottom plate of passenger car and preparation method thereof |
| CN111516761A (en) * | 2020-04-20 | 2020-08-11 | 重庆长安汽车股份有限公司 | Carbon fiber composite material automobile front floor, manufacturing method and automobile |
| CN113524808A (en) * | 2021-06-22 | 2021-10-22 | 广东汇天航空航天科技有限公司 | Aerocar floor, preparation method thereof and aerocar |
| CN114211772A (en) * | 2021-12-13 | 2022-03-22 | 浙江抟原复合材料有限公司 | Processing method of flat plate type thermoplastic PEKK carbon fiber unidirectional tape laminate |
| CN114932693A (en) * | 2022-06-14 | 2022-08-23 | 中复神鹰(上海)科技有限公司 | Preparation method of carbon fiber composite laminated board with high open pore tensile strength |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111516761A (en) * | 2020-04-20 | 2020-08-11 | 重庆长安汽车股份有限公司 | Carbon fiber composite material automobile front floor, manufacturing method and automobile |
| CN111469936A (en) * | 2020-04-26 | 2020-07-31 | 中航复合材料有限责任公司 | Composite front floor single bottom plate of passenger car and preparation method thereof |
| CN113524808A (en) * | 2021-06-22 | 2021-10-22 | 广东汇天航空航天科技有限公司 | Aerocar floor, preparation method thereof and aerocar |
| CN113524808B (en) * | 2021-06-22 | 2024-02-20 | 广东汇天航空航天科技有限公司 | Aerocar floor, preparation method thereof and aerocar |
| CN114211772A (en) * | 2021-12-13 | 2022-03-22 | 浙江抟原复合材料有限公司 | Processing method of flat plate type thermoplastic PEKK carbon fiber unidirectional tape laminate |
| CN114932693A (en) * | 2022-06-14 | 2022-08-23 | 中复神鹰(上海)科技有限公司 | Preparation method of carbon fiber composite laminated board with high open pore tensile strength |
| CN114932693B (en) * | 2022-06-14 | 2023-07-28 | 中复神鹰(上海)科技有限公司 | Preparation method of carbon fiber composite laminated board with high open-pore tensile strength |
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Application publication date: 20200306 |