CN113601765A - High-appearance-demand carbon fiber product and compression molding method thereof - Google Patents
High-appearance-demand carbon fiber product and compression molding method thereof Download PDFInfo
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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
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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
- B29C70/342—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
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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Abstract
The invention relates to a high-appearance-requirement carbon fiber product and a compression molding method thereof, wherein the compression molding method of the high-appearance-requirement carbon fiber product comprises the steps of carrying out decomposition design on the high-appearance-requirement carbon fiber product, wherein the high-appearance-requirement carbon fiber product comprises an appearance layer (or an inner lining layer) and a preform matched with the appearance layer; molding the appearance layer in a mould pressing or vacuumizing mode by adopting an appearance layer mould to obtain a solidified appearance layer; and then putting the appearance layer and the preform into a forming die, attaching the appearance layer to the surface of the preform, heating and pressurizing the appearance layer and the preform, and integrally curing and forming to obtain the high-appearance-requirement carbon fiber product. The invention can solve the quality problems of surface grain distortion and corrugation of the carbon fiber product compression molding process, improve the yield, reduce scrap and save the production cost.
Description
Technical Field
The invention relates to the technical field of carbon fiber forming processing, in particular to a carbon fiber product with high appearance requirement and a compression molding method thereof.
Background
In recent years, carbon fiber products have been widely used as a result of the carbonization of carbon fibers in various industrial products. The forming method of carbon fiber products is different, including mould pressing, bag pressing, vacuum pumping, winding, hand pasting, RTM and the like, the forming method is different in different seasons, the applied products are different, the product is mainly determined according to the characteristics of the product, meanwhile, the price is also considered, and therefore, the manufacturing cost is also one of the key considerations. At present, most of aluminum products are transformed into carbon fibers, after all, carbon fiber products have uniqueness, low density, high strength, corrosion resistance and the like, and for products with high strength requirements and complex designs, a mould pressing method and a bag pressing method are mainly considered, which are two methods with high difficulty in realization, particularly a mould pressing method, which is subdivided into sandwich mould pressing, mould pressing piece forming, mould pressing forming and the like, wherein the mould pressing piece forming is the most complex in the mould pressing method.
The molding method is to use a mold to press and mold, and the whole product is solid, and the number of carbon fiber layers must be strictly designed according to the product specification in the molding process, but because the carbon fibers have tolerance in the process of manufacturing prepreg cloth, the design can be perfect theoretically, and the carbon fibers can still have difference in actual operation, so that the fiber grains are distorted and even broken due to the excessive thickness of the prepreg in the process of pressing.
Especially, 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 the distortion and even the fracture of fiber grains caused by the mould pressing link cannot be avoided.
At present, in order to solve the above contradiction, on the premise of ensuring sufficient strength from the design, a product is made large, then a foaming material is added in the middle of the product, the foaming material is smaller in volume when the foaming temperature is not reached after heating than after the foaming temperature is reached, so that the volume of a preform of the product is smaller when a mold is pressed downwards, and the built-in foaming material begins to expand after the mold is heated so as to compact the layers of prepreg cloth, so that the distortion of fiber grains on the surface of a carbon fiber product can be relieved, and the product with acceptable appearance can be obtained.
However, the above-mentioned manner of filling the foam material between the carbon fiber layers to form the sandwich molding can solve the problem of surface texture for thicker products, and when the thickness of the product is thinner and there is not enough space to increase the foam material, for example, some sheet-like carbon fiber products, the thickness is below 3.0mm, the above-mentioned scheme of filling the foam material cannot be adopted.
Disclosure of Invention
The invention aims to solve the problem that the existing thin carbon fiber product cannot eliminate the distortion of surface grains, wherein the grains refer to the grains of the carbon fiber woven fabric prepreg cloth, and the outermost layer of the carbon fiber product with high appearance requirement in the invention is the carbon fiber woven fabric prepreg cloth, so that the formed product is required to keep the original grain characteristics of the carbon fiber woven prepreg cloth.
The invention provides a carbon fiber product with high appearance requirement and a compression molding method thereof, wherein the method is not only suitable for thin products, but also suitable for thick carbon fiber products with high appearance requirement, and has the advantages of protecting original lines of carbon fiber woven prepreg cloth and forming high-quality appearance.
The carbon fiber product with high appearance demand is provided with carbon fiber lines in appearance and is formed by solidifying carbon fiber prepreg cloth, the carbon fiber prepreg cloth is woven cloth and is divided into straight-line cloth or inclined-line cloth according to line rules, and the straight-line cloth or the inclined-line cloth can also be formed by cross-laying of unidirectional carbon fiber prepreg cloth, and the laying angle comprises 20 degrees, 30 degrees, 45 degrees, +/-90 degrees and the like.
The invention carries out decomposition design on the high-appearance-requirement carbon fiber product, and the high-appearance-requirement carbon fiber product comprises an appearance layer and a preformed piece matched with the appearance layer, wherein the appearance layer is independently cured and molded firstly, and the preformed piece is obtained by laminating carbon fiber prepreg cloth layer by layer according to the structural design rule. 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 0.5-5.0mm on the basis of the thickness required by 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, a buffer layer is added for accommodating the silica gel layer, namely, silica gel is filled into the appearance layer mold firstly, the silica gel layer is formed by curing after vulcanization, and the thickness is consistent with the thickness of the buffer layer. The silica gel layer can be from the type, is heated and can expand, has certain elasticity simultaneously to provide suitable pressure in the shaping of outward appearance layer, and can separate rather than after the solidification of outward appearance layer, the line characteristics that the carbon fiber woven prepreg cloth have been kept to the outward appearance of the outward appearance layer who obtains.
In the invention, in the process of integrating the appearance layer and the preform, the appearance layer is solidified, so that the preform is difficult to be directly connected, therefore, the invention adopts a first surface degreasing treatment of the appearance layer, including coarsening and cleaning, and then a bonding agent, preferably a condensation polymer of epoxy chloropropane and bisphenol A or polyhydric alcohol, is coated, and the quality of the whole appearance can be ensured without obvious concave-convex and cracks on the premise of ensuring the bonding strength. In addition, the forming mold is designed according to the normal high appearance requirement carbon fiber product mold, but in the forming condition, in order to reduce the adverse effect of the secondary forming process on the cured appearance layer as much as possible, the temperature, the mold pressure and the inflation pressure at the moment need to be controlled.
The specific scheme is as follows:
a compression molding method for a carbon fiber product with high appearance demand is characterized in that the outermost layer of the carbon fiber product with high appearance demand is carbon fiber woven cloth or cross-laid prepreg cloth, and the carbon fiber product with high appearance demand is subjected to decomposition design and comprises an appearance layer and a preform matched with the appearance layer; molding or vacuum-forming the appearance layer by adopting an appearance layer mold to obtain a solidified appearance layer; and then putting the appearance layer and the preform into a forming die, attaching the appearance layer to the surface of the preform, heating and pressurizing the appearance layer and the preform, and integrally curing and forming to obtain the high-appearance-requirement carbon fiber product.
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 requirement carbon fiber product; the preform is the structure left after the appearance layer is subtracted on the basis of the high-appearance-requirement carbon fiber product;
step 2: designing a forming mold of the appearance layer, namely the appearance layer mold, wherein the depth of a mold cavity of the appearance layer mold is based on the thickness of the appearance layer and the thickness of a buffer layer;
and step 3: utilizing the forming die in step 2 to carry out the shaping of appearance layer adopts the mould pressing mode shaping, includes: adding silica gel into the appearance layer die, 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 laying carbon fiber prepreg on the surface of the silica gel layer, heating and pressurizing to form and solidify the carbon fiber prepreg, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain the solidified appearance layer; or, the vacuum forming method comprises the following steps: laying carbon fiber prepreg and a protective film on the surface of the mold cavity of the appearance layer mold, then placing a vulcanized silica gel layer on the carbon fiber prepreg, then laying an adhesive tape and a high-temperature-resistant plastic film on the surface of the silica gel layer, pressurizing by using a vacuumizing mode, forming and curing the carbon fiber prepreg in a heating furnace, and separating the formed carbon fiber cloth from the silica gel layer after cooling to obtain the cured appearance layer;
and 4, step 4: and roughening and cleaning the first surface of the appearance layer, wherein the first surface is used for being connected with the preform to form the high-appearance-requirement carbon fiber product, uniformly coating an adhesive on the cleaned first surface, placing the appearance layer on a position matched with the preform, placing the appearance layer and the preform together in a product forming mold, heating, pressurizing and inflating, and integrally curing and forming to obtain the high-appearance-requirement carbon fiber product.
Further, the thickness of the high-appearance-requirement carbon fiber product is 1.0-3.0 mm.
Further, the thickness of the appearance layer is 0.3-2.0 mm.
Further, the thickness of the buffer in the step 2 is 0.5-5.0 mm.
Further, in the step 3, the silica gel is silicon rubber, oxidized silica gel or silicic acid gel, the silica gel is positioned in the lower die cavity of the appearance layer die, and the carbon fiber prepreg is laid on the 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 20-60 min.
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 laying carbon fiber prepreg on the surface of the silica gel layer, heating and curing the carbon fiber prepreg in a mould pressing or vacuumizing mode, and then separating the formed carbon fiber from the silica gel layer to obtain the cured appearance layer.
Further, in step 4, the adhesive is a condensation polymer of epichlorohydrin and bisphenol a or a polyol, the adhesive is applied and dried, and after the volatile substance is volatilized, the first surface of the appearance layer is placed in a position corresponding to the preform so as to face the preform.
Further, in step 4, the preform is obtained by laminating the carbon fiber prepreg according to the structural design rule layer by layer.
Optionally, in the step 4, the conditions of heating and pressurizing 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 0.9-1.1 MPa.
The invention also protects the high-appearance-requirement carbon fiber product prepared by the compression molding method of the high-appearance-requirement carbon fiber product, wherein the surface of the high-appearance-requirement carbon fiber product is carbon fiber woven cloth or cross-laid prepreg cloth, and the original texture characteristics of the carbon fiber woven prepreg cloth are retained.
Has the advantages that: the compression molding method for the carbon fiber product with high appearance requirement can solve the quality problems of surface grain 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 illustrate the technical solution of the present invention more clearly, the drawings will be briefly described below, and it is apparent that the drawings in the following description relate only to some embodiments of the present invention and are not intended to limit the present invention.
FIG. 1 is a schematic view of the formation of an appearance layer provided in accordance with one embodiment 1 of the present invention;
FIG. 2 is a schematic view of the overall molding provided in accordance with an embodiment 1 of the present invention;
FIG. 3 is a photograph of a carbon fiber prepreg provided in accordance with one embodiment of the present invention 1;
FIG. 4 is a photograph of a molded appearance layer provided in accordance with one embodiment of the present invention;
FIG. 5 is a photograph of an integral molding provided in accordance with one embodiment of the present invention 1;
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 following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available. In the following examples, "%" means weight percent, unless otherwise specified.
Example 1 (appearance layer molding method)
A compression molding method for carbon fiber products with high appearance requirements is disclosed, the molding principle refers to fig. 1 and fig. 2, the selected carbon fiber prepreg is shown in fig. 3, regular lines can be seen from the carbon fiber prepreg, and the compression molding method comprises the following steps:
step 1: designing an appearance layer of the carbon fiber product with high appearance requirement; the preform is a structure left after the appearance layer is subtracted on the basis of the carbon fiber product with high appearance requirement;
step 2: designing a forming mold of the appearance layer, namely an appearance layer mold, wherein the depth of a mold cavity of the appearance layer mold is based on the thickness of the appearance layer and the thickness of the buffer layer;
and step 3: as shown in fig. 1, adding silica gel into the appearance layer mold, 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 laying carbon fiber prepreg on the surface of the silica gel layer, heating and pressurizing the carbon fiber prepreg, curing the carbon fiber prepreg, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain a cured appearance layer; as shown in fig. 4. The left side is the appearance layer without burrs at all and the right side is the appearance layer with burrs removed, which is used for the next step. The appearance layer can be seen to keep the grain characteristics of the carbon fiber prepreg cloth and has no distortion or fracture.
And 4, step 4: and (3) roughening and cleaning the first surface of the appearance layer, wherein the first surface is used for being connected with the preform to form the carbon fiber product with high appearance requirement, uniformly coating an adhesive on the cleaned first surface, then placing the appearance layer on a position matched with the preform, placing the appearance layer and the preform together in a forming mold, heating, pressurizing and inflating the appearance layer to form the carbon fiber product with high appearance requirement, integrally curing and forming the carbon fiber product with high appearance requirement at the temperature of 150-160 ℃, the mold pressure of 9.0-10.0 MPa, the inflation pressure of 0.9-1.1MPa, and the heat preservation and pressurization time of 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 (vacuum forming of appearance layer)
A compression molding method for carbon fiber products with high appearance requirements is disclosed, the molding principle refers to FIG. 6, the selected carbon fiber prepreg is shown in FIG. 3, regular lines can be seen from the carbon fiber prepreg, and the compression 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 a structure left after the appearance layer is subtracted on the basis of the carbon fiber product with high appearance requirement;
step 2: designing a forming mold of the appearance layer, namely an appearance layer mold, wherein the depth of a mold cavity of the appearance layer mold is based on the thickness of the appearance layer and the buffer thickness is added, and the buffer thickness is 0.5-5.0 mm.
And step 3: as shown in fig. 3, carbon fiber prepreg is laid on the surface of the mold cavity of the appearance layer mold, and then a vulcanized silica gel layer is placed on the carbon fiber prepreg, wherein the thickness of the silica gel layer is the same as the buffer thickness; and then paving a heat-absorbing adhesive tape and a high-temperature-resistant PE bag film (namely a vacuum bag) on the surface of the silica gel layer, pressurizing by using a vacuumizing mode, placing the silica gel layer in a heating furnace, keeping the temperature and the pressure for 20-60min at the temperature of 150-160 ℃, forming and curing the carbon fiber prepreg cloth, cooling, and separating the formed carbon fiber cloth from the silica gel layer to obtain an appearance layer, wherein the appearance layer retains the grain characteristics of the carbon fiber prepreg cloth and is not twisted or broken.
And 4, step 4: and roughening and cleaning the first surface of the appearance layer, wherein the first surface is used for being connected with the preform to form a high-appearance-requirement carbon fiber product, uniformly coating an adhesive on the cleaned first surface, wherein the adhesive is a polycondensate of epichlorohydrin and bisphenol A or polyhydric alcohol, and the carbon fiber product can be used after being naturally aired or baked at low temperature (45 ℃) for 10min after being coated with the adhesive. And (3) enabling the first surface of the appearance layer to face the preform, placing the appearance layer and the preform at a position matched with the preform, placing the appearance layer and the preform together in a forming mold, heating, pressurizing and inflating the appearance layer, integrally curing and forming the appearance layer and the preform at the temperature of 150-160 ℃, the mold pressure of 9.0-10.0 MPa, the inflation pressure of 0.9-1.1MPa, and the heat preservation and pressurization time of 25-60min, and finally curing the appearance layer and the preform into a whole to obtain the high-appearance-requirement carbon fiber product. Because the appearance layer is solidified, the distortion on the grains can not be caused during secondary solidification, thus the quality of the surface appearance grains can be ensured, and the proportion of appearance defective products is reduced from more than 10 percent to less than 0.5 percent at present.
Comparative example 1
Referring to example 2, except that the outer layer had a thickness of 2.0mm, it was found that it was difficult to directly mold by press molding and difficult to bond the preform by barely molding, according to the operation of example 2.
Comparative example 2
The experiment is carried out on the basis of the embodiment 1 and the embodiment 2, and the difference is only that the silica gel is not used as a buffer layer, and the direct compression molding or the vacuum-pumping molding is carried out, so that the appearance layer can cause the texture distortion and even the fracture.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The compression molding method for the carbon fiber product with high appearance demand is characterized in that the outermost layer of the carbon fiber product with high appearance demand is carbon fiber woven cloth or cross-laid prepreg cloth: performing decomposition design on the high-appearance-requirement carbon fiber product, wherein the high-appearance-requirement carbon fiber product comprises an appearance layer and a preform matched with the appearance layer; molding the appearance layer in a mould pressing or vacuumizing mode by adopting an appearance layer mould to obtain a solidified appearance layer; and then putting the appearance layer and the preform into a forming die, attaching the appearance layer to the surface of the preform, heating and pressurizing the appearance layer and the preform, and integrally curing and forming to obtain the high-appearance-requirement carbon fiber product.
2. The high appearance requirement carbon fiber product compression molding method according to claim 1, characterized in that: the method comprises the following steps:
step 1: designing an appearance layer of the high appearance requirement carbon fiber product; the preform is the structure left after the appearance layer is subtracted on the basis of the high-appearance-requirement carbon fiber product;
step 2: designing a forming mold of the appearance layer, namely the appearance layer mold, wherein the depth of a mold cavity of the appearance layer mold is based on the thickness of the appearance layer and the thickness of a buffer layer;
and step 3: utilizing the forming die in step 2 to carry out the shaping of appearance layer adopts the mould pressing mode shaping, includes: adding silica gel into the appearance layer die, 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 laying carbon fiber prepreg on the surface of the silica gel layer, heating and pressurizing to form and solidify the carbon fiber prepreg, and separating the formed carbon fiber appearance layer from the silica gel layer to obtain the solidified appearance layer; or, the vacuum forming method comprises the following steps: laying carbon fiber prepreg and a protective film on the surface of the mold cavity of the appearance layer mold, then placing a vulcanized silica gel layer on the carbon fiber prepreg, then laying an adhesive tape and a high-temperature-resistant plastic film on the surface of the silica gel layer, pressurizing by using a vacuumizing mode, forming and curing the carbon fiber prepreg in a heating furnace, and separating the formed carbon fiber cloth from the silica gel layer after cooling to obtain the cured appearance layer;
and 4, step 4: and roughening and cleaning the first surface of the appearance layer, wherein the first surface is used for being connected with the preform to form the high-appearance-requirement carbon fiber product, uniformly coating an adhesive on the cleaned first surface, placing the appearance layer on a position matched with the preform, placing the appearance layer and the preform together in a product forming mold, heating, pressurizing and inflating, and integrally curing and forming to obtain the high-appearance-requirement carbon fiber product.
3. The compression molding method for carbon fiber products with high appearance requirements according to claim 1 or 2, wherein: the thickness of the high-appearance-demand carbon fiber product is 1.0-3.0 mm.
4. The compression molding method for carbon fiber products with high appearance requirements according to claim 1 or 2, wherein: the thickness of the appearance layer is 0.3-2.0 mm.
5. The high appearance requirement carbon fiber product compression molding method according to claim 2, characterized in that: in the step 2, the thickness of the buffer is 0.5-5.0 mm.
6. The high appearance requirement carbon fiber product compression molding method according to claim 2, characterized in that: in the step 3, the silica gel is silicon rubber, oxidized silica gel or silicic acid gel, the silica gel is positioned in a lower die cavity of the appearance layer die, and the carbon fiber prepreg cloth is laid on a lower layer of the vulcanized silica gel;
optionally, the conditions of warming and pressurizing in the step 3 are as follows: the temperature is 150-160 ℃, the pressure of the die is 9.0-10.0 MPa, and the heat preservation time is 20-60 min.
7. The high appearance requirement carbon fiber product compression molding method according to claim 2, characterized in that: in step 4, the adhesive is a condensation polymer of epichlorohydrin and bisphenol A or polyhydric alcohol, the adhesive is coated and dried, volatile substances are volatilized, and the first surface of the appearance layer faces the preform and is placed at a position matched with the preform.
8. The high appearance requirement carbon fiber product compression molding method according to claim 2, characterized in that: in step 4, the preform is obtained by laminating the carbon fiber prepreg cloth layer by layer according to the structural design rule.
9. The high appearance requirement carbon fiber product compression molding method according to claim 2, characterized in that: in the step 4, the conditions of heating and pressurizing are that the temperature is 150-160 ℃, the pressure of the die is 9.0-10.0 MPa, the heat preservation time is 25-60min, and the inflation pressure is 0.9-1.1 MPa.
10. The high appearance requirement carbon fiber product prepared by the compression molding method of the high appearance requirement carbon fiber product according to any one of claims 1 to 9, wherein the compression molding method comprises the following steps: the surface of the carbon fiber product with high appearance demand is carbon fiber woven cloth or cross-laid prepreg cloth, and the original grain characteristics of the carbon fiber woven prepreg cloth are reserved.
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| WO2023193222A1 (en) * | 2022-04-08 | 2023-10-12 | 许秀政 | Carbon fiber bicycle component structure and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN103395156A (en) * | 2013-07-18 | 2013-11-20 | 刘巧练 | Production process of aircraft made from carbon fiber composite material with steps at inner wall of shell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103395156A (en) * | 2013-07-18 | 2013-11-20 | 刘巧练 | Production process of aircraft made from carbon fiber composite material with steps at inner wall of shell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023193222A1 (en) * | 2022-04-08 | 2023-10-12 | 许秀政 | Carbon fiber bicycle component structure and manufacturing method therefor |
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