CN109094057B - Compression molding method for carbon fiber automobile front hatch cover - Google Patents
Compression molding method for carbon fiber automobile front hatch cover Download PDFInfo
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- CN109094057B CN109094057B CN201811152989.2A CN201811152989A CN109094057B CN 109094057 B CN109094057 B CN 109094057B CN 201811152989 A CN201811152989 A CN 201811152989A CN 109094057 B CN109094057 B CN 109094057B
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- carbon fiber
- hatch cover
- front hatch
- prepreg
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 66
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 66
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000748 compression moulding Methods 0.000 title claims abstract description 24
- 239000011265 semifinished product Substances 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims description 20
- 239000000047 product Substances 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000033764 rhythmic process Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 7
- 238000009966 trimming Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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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
- B29C70/46—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
-
- 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
- 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 relates to a carbon fiber front hatch cover rapid compression molding process flow for an automobile. Belongs to the technical field of traffic facilities. Compared with the common automobile carbon fiber front hatch cover compression molding method, the carbon fiber automobile front hatch cover compression molding method provided by the invention has the advantages that three processes of prepreg preheating, preforming and semi-finished product cooling are omitted, the process flow is simplified, equipment and tools put in a production line are reduced, the occupied space of the equipment and tools is saved, the input cost is reduced, and the quality risk that position placement deviation and fiber texture disorder are possibly caused by preform transfer is avoided; the medium-temperature curing carbon fiber prepreg with the curing time of 5-10min is selected, so that the compression molding cycle of the automobile front hatch cover is greatly shortened, and a great step is taken for adapting to the high-efficiency production rhythm of the automobile industry; the semi-finished product is demoulded after the temperature of the mould is reduced to 80-100 ℃, so that the mould-occupying time of the semi-finished product is reduced, the forming period is shortened, and the quality problems of deformation, mould sticking and disordered fiber texture of the semi-finished product are solved.
Description
Technical Field
The invention relates to a carbon fiber front hatch cover rapid compression molding process flow for an automobile. Belongs to the technical field of traffic facilities.
Background
The currently common compression molding method for the automobile front hatch cover generally comprises the steps of prepreg cutting, prepreg preheating, preforming, preform mold entering, mold closing, curing, demolding, semi-finished product cooling, trimming, inspection and the like, so that the molding process is more, the production line is longer, the input equipment, tools, fields, cost and the like of the production line are increased, the quality control points are increased, and the risk is increased for the quality of the final product; the prepreg curing cycle of the common curing system is as long as several hours, and the prepreg curing cycle can not adapt to the rhythm of high-efficiency production in the automobile industry completely; in order to facilitate demoulding, avoid deformation and sticking of the semi-finished product and prevent disorder of fiber textures on the outer surface of the semi-finished product, the temperature of a forming mould is reduced to be below 60 ℃ and then demoulding is carried out, so that the semi-finished product occupies longer time in the mould, the forming period is further prolonged, the next product needs to be heated again for forming, and the energy consumption is increased; compression molded carbon fiber front hatch covers will also face two major technical problems: firstly, the texture direction of the carbon fiber on the outer surface can not be disordered completely, and secondly, the product deformation of the special-shaped profile with the thickness of about 1mm meets the tolerance requirement.
Disclosure of Invention
The purpose of the invention is as follows: on the premise of ensuring the quality of a carbon fiber front hatch cover product formed by compression molding, particularly the requirements of carbon fiber texture and molded surface tolerance on the outer surface, the invention provides a carbon fiber automobile front hatch cover rapid compression molding process flow in order to simplify the process flow, reduce the input cost of a production line, shorten the molding period and improve the production efficiency so as to adapt to the high-efficiency rhythm of the production in the automobile industry.
The technical solution of the invention is as follows: the carbon fiber prepreg is used as a forming material, and the compression molding method is realized on a flow production line on the basis of a prepreg compression molding process as follows: 1) cutting the prepreg: integrally cutting the required multiple layers of carbon fiber prepreg by using a cutting machine according to the designed shape of the front hatch cover; 2) entering a mold: directly putting the cut prepreg into a forming die which is preheated to a medium-low temperature of a ℃; 3) and (3) die assembly: setting a press according to the molding process parameters of the carbon fiber prepreg, closing the die, pressurizing and heating; 4) curing: heating the mold to the medium temperature of b ℃, and simultaneously curing for 5-10 min; 5) demoulding: after the curing is finished, the mold is cooled to the medium-low temperature of a ℃ to obtain a semi-finished product of the carbon fiber automobile front hatch cover, and the semi-finished product of the cured carbon fiber automobile front hatch cover is demoulded; 6) edge cutting: immediately carrying out edge cutting treatment on the demolded front hatch cover semi-product; 7): and (4) checking: detecting the carbon fiber texture and the shape profile tolerance of the outer surface of the product; and (3) molding a second carbon fiber automobile front hatch cover under the condition that the medium-low temperature of the molding die is kept at a ℃, repeating the steps 2), 3), 4) and 5) to obtain a second carbon fiber automobile front hatch cover semi-finished product, and continuously circulating until all the carbon fiber automobile front hatch cover semi-finished products are finished.
The carbon fiber prepreg adopts a medium-temperature curing resin system, the curing time is about 5-10min, and the carbon fiber is 3K and 12K.
The temperature of the forming mold is raised to 80-100 ℃ before the prepreg is placed into the mold, raised to 130-150 ℃ after the prepreg is placed into the mold, and cooled to 80-100 ℃ during demolding after curing, and the continuous circulation is carried out, so that the production line can continuously run.
When the outer surface of the product is inspected, the fiber texture of the outer surface of the product is clear, and the vertical edge area with the height of 2mm at the periphery has no fiber disorder phenomenon.
The invention has the advantages and beneficial effects that: compared with the common automobile carbon fiber front hatch cover compression molding method, the carbon fiber automobile front hatch cover compression molding method provided by the invention has the advantages that three processes of prepreg preheating, preforming and semi-finished product cooling are omitted, the process flow is simplified, equipment and tools put in a production line are reduced, the occupied space of the equipment and tools is saved, the input cost is reduced, and the quality risk that position placement deviation and fiber texture disorder are possibly caused by preform transfer is avoided; the medium-temperature curing carbon fiber prepreg with the curing time of 5-10min is selected, so that the compression molding cycle of the automobile front hatch cover is greatly shortened, and a great step is taken for adapting to the high-efficiency production rhythm of the automobile industry; the semi-finished product is demoulded after the temperature of the mould is reduced to 80-100 ℃, so that the time of the semi-finished product occupying the mould is reduced, the forming period is shortened, the quality problems of deformation, mould sticking and disordered fiber texture of the semi-finished product are solved, the semi-finished product can be subjected to trimming treatment after demoulding, the internal stress is released, and the appearance of the product is prevented from being out of tolerance; the temperature of the die after demoulding is 80-100 ℃, is consistent with the temperature of the die during mould entering, so that the next cycle of forming can be carried out, and the production line can be continuously operated by the analogy, so that the temperature rise of the die before mould entering is saved, the production efficiency is further improved, and the energy consumption is saved; the appearance of the outer surface of the front hatch cover requires that the direction of the carbon fiber texture is completely not disordered, the fiber texture of the outer surface of a semi-finished product after prepreg is directly put into a forming die and is pressurized and cured is clear, and the vertical edge area with the height of 2mm on the periphery has no fiber disorder phenomenon.
Drawings
FIG. 1 is a schematic view of a carbon fiber automobile front hatch cover rapid compression molding process flow
Fig. 2 is a schematic view of the external shape of a front hatch of an automobile, wherein fig. b is a view a-a of fig. a.
Detailed Description
A carbon fiber automobile front hatch cover compression molding method takes carbon fiber prepreg as a molding material, takes a prepreg molding process as a basis, and realizes the compression molding method on a flow production line as follows:
1. cutting a prepreg: integrally cutting the required multiple layers of carbon fiber prepreg by using a cutting machine according to the designed shape of the front hatch cover;
2. entering a mold: directly putting the cut prepreg into a forming die which is preheated to a medium-low temperature of a ℃;
3. die assembly: setting a press according to the molding process parameters of the carbon fiber prepreg, closing the die, pressurizing and heating;
4. and (3) curing: heating the mold to the medium temperature of b ℃, and simultaneously curing for 5-10 min;
5. demolding: after the curing is finished, the mold is cooled to the medium-low temperature of a ℃ to obtain a semi-finished product of the carbon fiber automobile front hatch cover, and the semi-finished product of the cured carbon fiber automobile front hatch cover is demoulded;
6. trimming: immediately carrying out edge cutting treatment on the demolded front hatch cover semi-product;
7. and (4) checking: detecting the carbon fiber texture and the shape profile tolerance of the outer surface of the product;
8. and (3) molding a second carbon fiber automobile front hatch cover under the condition that the medium-low temperature of the molding die is kept at a ℃, repeating the steps 2, 3, 4 and 5 to obtain a second carbon fiber automobile front hatch cover semi-finished product, and continuously circulating until all the carbon fiber automobile front hatch cover semi-finished products are finished.
The carbon fiber prepreg adopts a medium-temperature curing resin system, the curing time is about 5-10min, the carbon fibers are 3K and 12K, the outer surface layer of the front hatch cover adopts 3K, the appearance is attractive, and the rest layers adopt 12K, so that the cost of raw materials is reduced.
When the temperature of the mold is reduced to a ℃, the temperature is consistent with the temperature of the mold during mold entering, heating-cooling-heating- … …, the production line continuously runs to form a recyclable mode, and the state of 'heat in and heat out' is achieved.
The front hatch cover product meets the requirements on the carbon fiber texture of the outer surface and the profile tolerance of the outer surface.
Examples
The invention discloses a compression molding method for a carbon fiber automobile front hatch cover, which is applied to a compression molding production line of a certain automobile carbon fiber front hatch cover, wherein the carbon fiber prepreg is quickly cured at a medium temperature of 130-150 ℃, the main equipment comprises a cutting machine (having the function of automatically peeling the upper/lower layers of release paper of the prepreg), a press (having the function of quickly heating/cooling) and a molding die, and the compression molding method is realized on a flow production line as follows:
1, cutting a prepreg: cutting 4 layers of required medium-temperature curing carbon fiber prepregs (1 layer of 3K +3 layers of 12K) integrally by using a cutting machine according to the designed shape of the front hatch cover, wherein the 3K carbon fiber prepregs are film-sticking layers and are arranged at the lowest part;
2. entering a mold: directly putting the cut prepreg (4 layers in total) into a forming die which is pre-heated to the medium-low temperature of 80-100 ℃;
3. die assembly: setting a press according to the technological parameters of the carbon fiber prepreg, closing the die, pressurizing (0.4-0.8MPa), and heating;
4. and (3) curing: the mold is heated to the medium temperature of 130 ℃ and 150 ℃ and is solidified for about 5-10 min;
5. demolding: after the curing is finished, the temperature of the mold is reduced to 80-100 ℃, the temperature of the mold is consistent with that of the mold during mold entering, a semi-finished product of the carbon fiber automobile front hatch cover is obtained, and the cured semi-finished product of the carbon fiber automobile front hatch cover is demoulded;
6. trimming: immediately carrying out edge cutting treatment on the demolded front hatch cover semi-product;
7. and (4) checking: and (3) manually inspecting the carbon fiber textures on the outer surface of the product, checking whether the textures are disordered, distorted or otherwise obviously disordered, placing the product qualified in the inspection of the carbon fiber textures on the outer surface on a profile detection tool, and detecting the tolerance of the profile of the appearance by using a thickness measuring ruler.
The product can directly enter the next cycle after being demoulded, namely, the working procedures 2 to 5 are continuously circulated, so that a continuous production line is formed, and the effect of 'hot in and hot out' is achieved.
The outer surface carbon fiber texture and the shape profile tolerance of the front hatch cover product molded on the production line meet the requirements.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (2)
1. The compression molding method for the carbon fiber automobile front hatch cover is characterized in that carbon fiber prepreg is used as a molding material, and the compression molding method is realized on a flow production line on the basis of a prepreg molding process as follows: 1) cutting the prepreg: integrally cutting the required multiple layers of carbon fiber prepreg by using a cutting machine according to the designed shape of the front hatch cover; 2) entering a mold: directly putting the cut prepreg into a forming die which is preheated to a medium-low temperature of a ℃; 3) and (3) die assembly: setting a press according to the molding process parameters of the carbon fiber prepreg, closing the die, pressurizing and heating; 4) curing: heating the mold to the medium temperature of b ℃, and simultaneously curing for 5-10 min; 5) demoulding: after the curing is finished, the mold is cooled to the medium-low temperature of a ℃ to obtain a semi-finished product of the carbon fiber automobile front hatch cover, and the semi-finished product of the cured carbon fiber automobile front hatch cover is demoulded; 6) edge cutting: immediately carrying out edge cutting treatment on the demolded front hatch cover semi-product; 7): and (4) checking: detecting the carbon fiber texture and the shape profile tolerance of the outer surface of the product; forming a second carbon fiber automobile front hatch cover under the condition that the medium-low temperature of a forming die is kept at a ℃, repeating the steps 2), 3), 4) and 5) to obtain a second carbon fiber automobile front hatch cover semi-finished product, and continuously circulating until all carbon fiber automobile front hatch cover semi-finished products are finished, wherein in the circulating process, the temperature of the die after demolding is a ℃ which is the same as the temperature a ℃ of the die during mold entering, so that the die directly enters the next cycle for forming; the molding mould is heated to 80-100 ℃ before the prepreg is put into the mould, the temperature is raised to 130-150 ℃ after the prepreg is put into the mould, and the temperature is reduced to 80-100 ℃ during demoulding after curing, and continuous circulation is carried out, so that the production line can continuously run
Wherein, the outward appearance of cabin cover surface requires that carbon fiber texture direction can not be disorderly totally before the car, and step 7) is to the result that the product surface detected: the fiber texture on the outer surface of the product is clear, and the vertical edge area with the height of 2mm on the periphery has no fiber disorder phenomenon.
2. The carbon fiber automobile front hatch cover compression molding method according to claim 1, characterized in that a medium-temperature curing resin system is selected for the carbon fiber prepreg, the curing time is 5-10min, and the carbon fiber is 3K and 12K.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811152989.2A CN109094057B (en) | 2018-09-29 | 2018-09-29 | Compression molding method for carbon fiber automobile front hatch cover |
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| CN201811152989.2A CN109094057B (en) | 2018-09-29 | 2018-09-29 | Compression molding method for carbon fiber automobile front hatch cover |
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| CN109094057B true CN109094057B (en) | 2021-09-14 |
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| CN109914863A (en) * | 2019-03-20 | 2019-06-21 | 北京航空航天大学 | Personal leisure and entertainment capsule and method of making the same |
| CN115534353A (en) * | 2022-05-19 | 2022-12-30 | 浙江理工大学 | Manufacturing process of composite material axle shell assembly for automobile chassis |
| CN115366441A (en) * | 2022-08-25 | 2022-11-22 | 中航复合材料有限责任公司 | Constant-temperature die pressing production process for automobile front hatch cover outer plate made of carbon fiber composite material |
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| CN102166825A (en) * | 2010-12-24 | 2011-08-31 | 中国科学院宁波材料技术与工程研究所 | Technology of making automobile engine cover with carbon fiber reinforcement resin-based composite material |
| CN107187078B (en) * | 2017-06-28 | 2020-01-31 | 江苏兆鋆新材料股份有限公司 | carbon fiber prepreg rapid compression molding process |
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