CN113601765B - Carbon fiber product with high appearance requirement and compression molding method thereof - Google Patents
Carbon fiber product with high appearance requirement and compression molding method thereof Download PDFInfo
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- CN113601765B CN113601765B CN202110901148.2A CN202110901148A CN113601765B CN 113601765 B CN113601765 B CN 113601765B CN 202110901148 A CN202110901148 A CN 202110901148A CN 113601765 B CN113601765 B CN 113601765B
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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
- B29C70/06—Fibrous reinforcements only
- B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
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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
-
- 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
- B29C70/342—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 isostatic pressure
-
- 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
Abstract
The invention relates to a high-appearance-demand carbon fiber product and a compression molding method thereof, wherein the compression molding method of the high-appearance-demand carbon fiber product comprises the steps of decomposing and designing the high-appearance-demand carbon fiber product, comprising an appearance layer (or an inner liner layer) and a preform matched with the appearance layer; molding the appearance layer by adopting an appearance layer mold in a mold pressing or vacuumizing mode to obtain a cured appearance layer; and then placing the appearance layer and the preform into a forming die, attaching the appearance layer on the surface of the preform, heating and pressurizing, and integrally curing and forming to obtain the carbon fiber product with high appearance requirements. The invention can solve the quality problems of surface texture distortion and corrugation of the compression molding process of the carbon fiber products, improve the yield, reduce scrapping and save the production cost.
Description
Technical Field
The invention relates to the technical field of carbon fiber molding processing, in particular to a carbon fiber product with high appearance requirement and a compression molding method thereof.
Background
In recent years, with the carbon fiber of products in various industries, carbon fiber products have been widely used. The carbon fiber products are formed by various methods including die pressing, bag pressing, vacuumizing, winding, hand pasting, RTM and the like, and the forming methods are various in ages, the products to be used are also different, mainly determined according to the characteristics of the products, and meanwhile, the price is also considered, so that the manufacturing cost is also one of important considerations. At present, most aluminum products are converted into carbon fibers, after all, carbon fiber products have the characteristics of low density, high strength, corrosion resistance and the like, and for products with high strength requirements and complex designs, mainly compression molding and bag compression molding are considered, which are two methods with great difficulty, particularly compression molding, and are subdivided into sandwich compression molding, compression molding and the like, and the molding of the molding is the most complex among the compression molding.
The compression molding is carried out by using a mold, and the whole product is solid, and the number of carbon fiber layers is strictly designed according to the specifications of the product in the molding process, but the carbon fibers can be perfectly designed in theory due to tolerance in the preparation of the prepreg, and the differences exist in the actual operation, so that the fiber lines are distorted and even broken due to the excessive thickness of the prepreg in the molding process.
In particular, some carbon fiber products have higher requirements on appearance, but the existing forming means can only be realized by a mould pressing method, so that fiber lines caused by mould pressing links cannot be prevented from being distorted or even broken.
At present, in order to solve the contradiction, on the premise of ensuring enough strength in design, a product is made large, then a foaming material is added in the middle of the product, and the foaming material is smaller than the volume after the foaming temperature is reached when the foaming material is heated and is not heated to reach the foaming temperature, so that the volume of a preform of the product is smaller when a die is pressed down, and the foaming material in the die begins to expand after the die is heated so as to compact a prepreg layer, thereby relieving the fiber texture distortion on the surface of a carbon fiber product and obtaining the product with acceptable appearance.
However, in the manner of filling the foam material between the carbon fiber layers to form the sandwich molding, the problem of surface texture can be solved for thicker products, and when the thickness of the product is thinner, the foam material, such as some sheet-shaped carbon fiber products, cannot be added, and the thickness is less than 3.0mm, so that the scheme of filling the foam material cannot be adopted.
Disclosure of Invention
The invention aims to solve the problem that the existing carbon fiber product with smaller thickness cannot eliminate surface texture distortion, wherein the texture refers to the texture of the carbon fiber woven fabric prepreg, and the outermost layer of the carbon fiber product with high appearance requirement is the carbon fiber woven fabric prepreg, so that the formed product is required to retain the original texture characteristics of the carbon fiber woven prepreg.
The invention provides a carbon fiber product with high appearance requirement and a compression molding method thereof, which are not only suitable for thinner products, but also suitable for thick carbon fiber products with higher appearance requirement.
The appearance of the carbon fiber product with high appearance requirement is carbon fiber texture, which is formed by curing carbon fiber prepreg cloth, wherein the carbon fiber prepreg cloth is woven cloth, is divided into straight cloth or diagonal cloth according to texture rules, and can also be formed by crossly laying unidirectional carbon fiber prepreg cloth, and the laying angles comprise 20 degrees, 30 degrees, 45 degrees, +/-90 degrees and the like.
The invention relates to a method for decomposing and designing a high-appearance-demand carbon fiber product, which comprises an appearance layer and a preform matched with the appearance layer, wherein the appearance layer is independently cured and molded, and the preform is obtained by laminating carbon fiber prepreg layer by layer according to structural design rules. The appearance layer is prepared by adopting an appearance layer mold, the depth of a mold cavity of the appearance layer mold is required to be added with 0.5-5.0mm on the basis of the required thickness of the appearance layer, the thickness is designed according to specific requirements, if the appearance layer is 0.3mm, the depth of the mold cavity is increased by 0.5mm, the total depth is at least 0.8mm, and the added appearance layer is a buffer layer for accommodating the silica gel layer, namely, the silica gel layer is firstly filled into the appearance layer mold, and is cured to form the silica gel layer after vulcanization, wherein the thickness is consistent with the thickness of the buffer layer. The silica gel layer can be released, heated and expanded, and has certain elasticity, so that proper pressure is provided in the forming of the appearance layer, and the silica gel layer can be separated from the appearance layer after the appearance layer is solidified, and the appearance of the obtained appearance layer keeps the grain characteristics of the carbon fiber woven prepreg.
In the process of integrating the appearance layer and the preform, the appearance layer is hard to directly connect the preform because the appearance layer is solidified, and for this purpose, the first surface of the appearance layer is degreased, including coarsening and cleaning, and then is coated with an adhesive, preferably a polycondensate of epichlorohydrin and bisphenol A or polyalcohol, which can ensure the quality of the whole appearance without obvious concave-convex and crack on the premise of ensuring the bonding strength. In addition, the molding die is designed according to the normal high-appearance requirement carbon fiber product die, but in the molding condition, in order to reduce the adverse effect of the secondary molding process on the cured appearance layer as much as possible, the temperature, the die pressure and the inflation pressure are required to be controlled at the moment.
The specific scheme is as follows:
the method comprises the steps that a carbon fiber product with high appearance requirements is subjected to decomposition design, and the carbon fiber product with high appearance requirements comprises an appearance layer and a preform matched with the appearance layer, wherein the outermost layer of the carbon fiber product with high appearance requirements is a carbon fiber woven cloth or a cross-laid prepreg; molding the appearance layer by adopting an appearance layer mold in a mold pressing or vacuum mode to obtain a cured appearance layer; and then placing the appearance layer and the preform into a forming die, attaching the appearance layer on the surface of the preform, heating and pressurizing, and integrally curing and forming to obtain the carbon fiber product with high appearance requirements.
Further, the compression molding method of the carbon fiber product with high appearance requirement comprises the following steps:
step 1: designing an appearance layer of the high-appearance-demand carbon fiber product; the preform is the structure remaining after subtracting the appearance layer on the basis of the high-appearance-demand carbon fiber product;
step 2: designing a forming die of the appearance layer, namely the appearance layer die, wherein the die cavity depth of the appearance layer die is based on the thickness of the appearance layer and the thickness of the buffer layer;
step 3: and (2) forming the appearance layer by using the forming die in the step (2), and forming by adopting a compression molding mode, wherein the method comprises the following steps: adding silica gel into the appearance layer mould, and vulcanizing to form a silica gel layer, wherein the thickness of the silica gel layer is the same as that of the buffer layer; then, paving carbon fiber prepreg cloth on the surface of the silica gel layer, heating and pressurizing, then forming and solidifying the carbon fiber prepreg cloth, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain the appearance layer after solidification; alternatively, the molding is performed in a vacuum manner, including: paving carbon fiber prepreg cloth and a protective film on the surface of a mold cavity of the appearance layer mold, placing a vulcanized silica gel layer on the carbon fiber prepreg cloth, paving a rubber suction cloth and a high-temperature-resistant plastic film on the surface of the silica gel layer, pressurizing in a vacuumizing mode, forming and solidifying the carbon fiber prepreg cloth in a heating furnace, cooling, and separating the formed carbon fiber cloth from the silica gel layer to obtain the appearance layer after solidification;
step 4: coarsening and cleaning a first surface of the appearance layer, wherein the first surface is used for being connected with the pre-formed piece to form the carbon fiber product with high appearance requirement, uniformly coating an adhesive on the cleaned first surface, then placing the appearance layer at a position matched with the pre-formed piece, placing the appearance layer in a product forming die together, heating, pressurizing and inflating the product forming die, and integrally curing and forming the product to obtain the carbon fiber product with high appearance requirement.
Further, the thickness of the high-appearance-demand carbon fiber product is 1.0-3.0 mm.
Further, the thickness of the appearance layer is 0.3-2.0mm.
Further, the buffer thickness in the step 2 is 0.5-5.0mm.
Further, in the step 3, the silica gel is silicon rubber, silica gel oxide or silicic acid gel, the silica gel is located in a lower die cavity of the appearance layer die, and the carbon fiber prepreg cloth is paved on an upper layer of the vulcanized silica gel;
optionally, the heating and pressurizing conditions in the step 3 are that the temperature is 150-160 ℃, the die pressure is 9.0-10.0 MPa, and the heat preservation time is 20-60min.
Further, adding silica gel into the appearance layer die in the step 3, and vulcanizing to form a silica gel layer, wherein the thickness of the silica gel layer is the same as that of the buffer layer; and then paving carbon fiber prepreg cloth on the surface of the silica gel layer, performing compression molding or vacuumizing to heat and solidify the carbon fiber prepreg cloth, and separating the molded carbon fiber from the silica gel layer to obtain the appearance layer after solidification.
In step 4, the adhesive is polycondensate of epichlorohydrin and bisphenol a or polyalcohol, and after the adhesive is coated and dried, the volatile matter volatilizes, the first surface of the appearance layer faces the preform and is placed at a position matched with the preform.
In step 4, the preform is obtained by laminating carbon fiber prepreg layers according to structural design rules.
Optionally, in the step 4, the heating and pressurizing conditions are that the temperature is 150-160 ℃, the die pressure is 9.0-10.0 MPa, the heat preservation time is 25-60min, and the inflation pressure is 0.9-1.1MPa.
The invention also protects the high-appearance-demand carbon fiber product prepared by the compression molding method of the high-appearance-demand carbon fiber product, wherein the surface of the high-appearance-demand carbon fiber product is a carbon fiber woven cloth or a cross-laid prepreg, and the original grain characteristics of the carbon fiber woven prepreg are reserved.
The beneficial effects are that: the compression molding method of the carbon fiber product with high appearance requirement can solve the quality problems of surface texture distortion and corrugation of the compression molding process of the carbon fiber product, improve the yield, reduce scrapping and save the production cost.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the following brief description will be made on the accompanying drawings, which are given by way of illustration only and not limitation of the present invention.
FIG. 1 is a schematic view of the shaping of an appearance layer according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of the overall molding provided in one embodiment 1 of the present invention;
FIG. 3 is a photograph of a carbon fiber prepreg cloth according to example 1 of the present invention;
FIG. 4 is a photograph of an exterior layer formed according to example 1 of the present invention;
FIG. 5 is a photograph of an integral molding provided in one embodiment 1 of the present invention;
fig. 6 is a schematic view of forming an appearance layer according to embodiment 2 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. In the examples below, "%" refers to weight percent, unless explicitly stated otherwise.
Example 1 (appearance layer compression molding)
A molding method of carbon fiber products with high appearance requirements, the molding principle is shown in fig. 1 and 2, the selected carbon fiber prepreg cloth is shown in fig. 3, regular lines can be seen from the carbon fiber prepreg cloth, and the molding method comprises the following steps:
step 1: designing an appearance layer of the carbon fiber product with high appearance requirement; the preform is the structure remaining after subtracting the appearance layer on the basis of the high-appearance-demand carbon fiber product;
step 2: designing a forming die of the appearance layer, namely an appearance layer die, wherein the depth of a die cavity of the appearance layer die is based on the thickness of the appearance layer and the thickness of the buffer layer;
step 3: as shown in fig. 1, silica gel is added into the appearance layer mold, and vulcanized to form a silica gel layer, wherein the thickness of the silica gel layer is the same as that of the buffer layer; then, paving carbon fiber prepreg cloth on the surface of the silica gel layer, heating and pressurizing the carbon fiber prepreg cloth, solidifying the carbon fiber prepreg cloth, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain an appearance layer after solidification; as shown in fig. 4. The left side is the appearance layer without flash at all, and the right side is the appearance layer with flash removed, the latter for the next step. The appearance layer can be seen to retain the grain characteristics of the carbon fiber prepreg without twisting or breaking.
Step 4: coarsening and cleaning a first surface of the appearance layer, wherein the first surface is used for being connected with a preform to form a carbon fiber product with high appearance requirement, uniformly coating an adhesive on the cleaned first surface, then placing the appearance layer at a position matched with the preform, placing the appearance layer and the preform in a forming die together, heating, pressurizing and inflating the appearance layer, integrally curing and forming the appearance layer, wherein the temperature is 150-160 ℃, the die pressure is 9.0-10.0 MPa, the inflation pressure is 0.9-1.1MPa, the heat preservation and pressurization time is 25-60min, and finally curing the appearance layer and the preform into a whole to obtain the carbon fiber product with high appearance requirement, as shown in figure 5.
Example 2 (appearance layer vacuum Forming)
A molding method of carbon fiber products with high appearance requirements, the molding principle is shown in fig. 6, the selected carbon fiber prepreg cloth is shown in fig. 3, regular grains can be seen from the carbon fiber prepreg cloth, and the molding method comprises the following steps:
step 1: designing an appearance layer of the carbon fiber product with high appearance requirement, wherein the thickness of the appearance layer is 0.3-2.0 mm; the preform is the structure remaining after subtracting the appearance layer on the basis of the high-appearance-demand carbon fiber product;
step 2: designing a forming die of the appearance layer, namely an appearance layer die, wherein the depth of a die cavity of the appearance layer die is 0.5-5.0mm based on the thickness of the appearance layer and the buffer thickness.
Step 3: as shown in fig. 3, a carbon fiber prepreg cloth is paved on the surface of a mold cavity of the appearance layer mold, and a vulcanized silica gel layer is placed on the carbon fiber prepreg cloth, wherein the thickness of the silica gel layer is the same as the buffer thickness; and then paving a suction fabric and a high-temperature-resistant PE bag film (namely a vacuum bag) on the surface of the silica gel layer, pressurizing in a vacuumizing mode, placing in a heating furnace, preserving heat and pressure for 20-60min at the temperature of 150-160 ℃, forming and solidifying the carbon fiber prepreg, cooling, separating the formed carbon fiber prepreg from the silica gel layer to obtain an appearance layer, wherein the appearance layer keeps the grain characteristics of the carbon fiber prepreg and has no distortion or fracture.
Step 4: coarsening and cleaning a first surface of the appearance layer, wherein the first surface is used for being connected with a preform to form a carbon fiber product with high appearance requirement, uniformly coating an adhesive on the cleaned first surface, wherein the adhesive is polycondensate of epichlorohydrin and bisphenol A or polyalcohol, and naturally airing or baking at a low temperature (45 ℃) for 10min after the adhesive is coated. And (3) placing the first surface of the appearance layer towards the preform at a position matched with the preform, placing the preform and the first surface of the appearance layer in a forming die together, heating, pressurizing and inflating the preform, and then integrally curing and forming the preform, wherein the temperature is 150-160 ℃, the die pressure is 9.0-10.0 MPa, the inflation pressure is 0.9-1.1MPa, the heat preservation and pressurizing time is 25-60min, and finally the appearance layer and the preform are cured into a whole, so that the carbon fiber product with high appearance requirement is obtained. Because the appearance layer is cured, distortion on the texture path is not caused during secondary curing, so that the appearance texture quality of the surface can be ensured, and the appearance defective product proportion is reduced from more than 10% to less than 0.5% at present.
Comparative example 1
With reference to example 2, except that the thickness of the exterior layer was 2.0mm, it was found that it was difficult to directly mold by compression molding and to bond the preform with the preform by marginal molding, according to the procedure of example 2.
Comparative example 2
Tests were performed on the basis of examples 1 and 2, except that no silicone was used as a buffer layer, and direct molding or vacuum forming was performed, and it was found that the appearance layer would cause distortion of the texture, even breakage.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (7)
1. The utility model provides a high outward appearance demand carbon fiber product compression molding method, the outermost layer of high outward appearance demand carbon fiber product is carbon fiber woven cloth, its characterized in that: the thickness of the high-appearance-demand carbon fiber product is 1.0-3.0 mm, and the high-appearance-demand carbon fiber product is decomposed and designed, and comprises an appearance layer and a preform matched with the appearance layer; molding the appearance layer by adopting an appearance layer mold in a mold pressing or vacuumizing mode to obtain a cured appearance layer; and then placing the appearance layer and the preform into a forming die to enable the appearance layer to be attached to the surface of the preform, heating and pressurizing, and then integrally curing and forming to obtain the carbon fiber product with high appearance requirements, wherein the method comprises the following steps of:
step 1: designing an appearance layer of the high-appearance-demand carbon fiber product; the preform is the structure remaining after subtracting the appearance layer on the basis of the high-appearance-demand carbon fiber product;
step 2: designing a forming die of the appearance layer, namely the appearance layer die, wherein the die cavity depth of the appearance layer die is based on the thickness of the appearance layer and the thickness of the buffer layer;
step 3: and (2) forming the appearance layer by using the forming die in the step (2), and forming by adopting a compression molding mode, wherein the method comprises the following steps: adding silica gel into the appearance layer mould, and vulcanizing to form a silica gel layer, wherein the thickness of the silica gel layer is the same as that of the buffer layer; then, paving carbon fiber woven cloth on the surface of the silica gel layer, heating and pressurizing, then forming and solidifying the carbon fiber woven cloth, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain the appearance layer after solidification; alternatively, the molding is performed in a vacuum manner, including: paving a carbon fiber woven cloth and a protective film on the surface of a mold cavity of the appearance layer mold, placing a vulcanized silica gel layer on the carbon fiber woven cloth, paving a rubber suction cloth and a high-temperature-resistant plastic film on the surface of the silica gel layer, pressurizing in a vacuumizing mode, forming and solidifying the carbon fiber woven cloth in a heating furnace, cooling, and separating the formed carbon fiber woven cloth from the silica gel layer to obtain the appearance layer after solidification;
step 4: coarsening and cleaning a first surface of the appearance layer, wherein the first surface is used for being connected with the pre-formed piece to form the carbon fiber product with high appearance requirement, uniformly coating an adhesive on the cleaned first surface, then placing the appearance layer at a position matched with the pre-formed piece, placing the appearance layer in a product forming die together, heating, pressurizing and inflating the product forming die, and integrally curing and forming the product to obtain the carbon fiber product with high appearance requirement.
2. The high-appearance-demand carbon fiber product compression molding method according to claim 1, wherein: the thickness of the appearance layer was 0.3mm.
3. The high-appearance-demand carbon fiber product compression molding method according to claim 1, wherein: the thickness of the buffer layer in the step 2 is 0.5-5.0mm.
4. The high-appearance-demand carbon fiber product compression molding method according to claim 1, wherein: in step 4, the adhesive is polycondensate of epichlorohydrin and bisphenol a or polyalcohol, and after the adhesive is coated and dried, the volatile material volatilizes, the first surface of the appearance layer faces the preform and is placed at a position matched with the preform.
5. The high-appearance-demand carbon fiber product compression molding method according to claim 1, wherein: in step 4, the preform is obtained by laminating carbon fiber woven cloth layer by layer according to structural design rules.
6. The high-appearance-demand carbon fiber product compression molding method according to claim 1, wherein: in the step 4, the heating and pressurizing conditions are that the temperature is 150-160 ℃, the die pressure is 9.0-10.0 MPa, the heat preservation time is 25-60min, and the inflation pressure is 0.9-1.1MPa.
7. The high-appearance-demand carbon fiber product prepared by the compression molding method of the high-appearance-demand carbon fiber product according to any one of claims 1 to 6 is characterized in that: the outermost layer of the carbon fiber product with high appearance requirement is carbon fiber woven cloth, and original grain characteristics of the carbon fiber woven cloth are reserved.
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| CN202110901148.2A CN113601765B (en) | 2021-08-06 | 2021-08-06 | Carbon fiber product with high appearance requirement and compression molding method thereof |
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| CN202110901148.2A CN113601765B (en) | 2021-08-06 | 2021-08-06 | Carbon fiber product with high appearance requirement and compression molding method thereof |
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| CN201856381U (en) * | 2010-11-15 | 2011-06-08 | 上海晋飞复合材料科技有限公司 | Compression molding die for prepreg |
| CN103395156B (en) * | 2013-07-18 | 2016-02-17 | 刘巧练 | Outer casing inner wall has the carbon fibre composite aircraft production technology of step |
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