A method for preparing carbon fiber reinforced composite material

Abstract

The present invention relates to the technical field of carbon fiber composite materials, and in particular to a method for preparing a carbon fiber reinforced composite material, the method comprising: determining the positions of a pressure roller and a pre-action roller of a hot press according to the shape of a carbon fiber plate; determining the feed flow rate of a feeder, and setting mold parameters at a corresponding mold position; coating a prepreg on carbon fiber through a feeder to generate a carbon fiber prepreg; preliminarily curing the carbon fiber prepreg; pre-pressing a cured semi-finished product using a pre-action roller, detecting the depth of a rib plate on the pre-pressed finished product to determine whether the pre-pressed finished product is qualified; pressing a qualified pre-pressed finished product using a pressure roller; the present invention splices feeders with different flow rates, thereby increasing the thickness of a cured semi-finished product at a deformation location of a carbon fiber plate, pre-pressing the cured semi-finished product first and then pressing the cured semi-finished product, so that the prepreg is evenly distributed in the cured semi-finished product, thereby improving the structural safety and stability of the carbon fiber reinforced composite material.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber composite materials, and in particular to a method for preparing a carbon fiber reinforced composite material. Background Art

[0002] Nowadays, traditional metal auto parts have been gradually replaced by lightweight materials, including aluminum alloys, glass fiber composites, carbon fiber composites, etc. Among them, carbon fiber composites have high strength and low density. In addition, carbon fiber reinforced composites have the functions of low thermal conductivity, flame retardancy and heat insulation, corrosion resistance, shock absorption and noise reduction, and have been used in some parts of super sports cars and high-value civilian cars. When carbon fiber composites are used to make automotive battery panels, in order to increase the structural strength of the battery, anti-deformation grooves are often made on the battery panels. When the carbon fiber composites are pressed to press the anti-deformation grooves, the uneven material at the stretched ribs is prone to insufficient strength.

[0003] China Patent Authorization Announcement No.: CN117698158A discloses a method for preparing a lightweight, high-performance composite flange. The invention discloses a method for preparing a lightweight, high-performance composite flange, which belongs to the field of composite material technology. The flange is made of carbon fiber prepreg directional laying in a compression mold, and is molded by high temperature and high pressure. After the molded part is demolded, it passes the X-ray non-destructive inspection, and then the screw holes are machined, and finally bonded and cured with titanium alloy screws. The composite flange molded by carbon fiber directional laying obtained by the invention can replace the metal material flange obtained by machining titanium alloy, and reduce the product weight by more than 30%, while increasing the charge of the shell and improving the power of the engine. The composite flange prepared by this method is suitable for solid rocket engine shell parts, and can withstand a pressure of 13 to 20 MPa together with the shell barrel section.

[0004] However, the above method has the following problems: after preheating and pre-pressing, the mold is opened to trim the overflow of the pre-pressed product, and after trimming is completed, the mold is closed for curing, resulting in waste of raw materials. At the same time, the extrusion process causes uneven thickness in some parts of the molded part, resulting in unqualified strength of the carbon fiber composite material. Summary of the invention

[0005] To this end, the present invention provides a method for preparing a carbon fiber reinforced composite material, which is used to overcome the problems in the prior art of preheating and pre-pressing in the preparation of carbon fiber reinforced composite materials, such as trimming the pre-pressed product before opening the mold, resulting in waste of raw materials, and the uneven thickness of the molded part during the extrusion process, resulting in unqualified strength of the carbon fiber composite material.

[0006] To achieve the above object, the present invention provides a method for preparing a carbon fiber reinforced composite material, comprising:

[0007] Determine the positions of the pressure roller and pre-action roller of the hot press according to the shape of the carbon fiber plate;

[0008] Determine the feed flow rate of the feeder according to the position of the pressure roller, and set the mold parameters at the corresponding mold position according to the feeder;

[0009] Laying carbon fibers in a mold and coating the prepreg on the carbon fibers through the feeder to generate carbon fiber prepreg;

[0010] The carbon fiber prepreg is heated and pressurized to initially cure the carbon fiber prepreg to generate a cured semi-finished product;

[0011] Using the pre-action roller to pre-press the solidified semi-finished product to generate a pre-pressed finished product, and detecting the depth of the ribs on the pre-pressed finished product to determine whether the pre-pressed finished product is qualified;

[0012] Using the pressure roller to press the qualified pre-pressed finished product to form a finished carbon fiber plate;

[0013] Wherein, the width and position of the pre-action roller are the same as those of the pressure roller; the pressing depth of the pre-action roller is less than the pressing depth of the pressure roller; and the mold parameters include the depth and width of the mold.

[0014] Further, the step of determining the feeding flow rate of the feeder according to the position of the pressure roller includes:

[0015] A feeder with a preset first flow rate is arranged corresponding to the position of the pressure roller;

[0016] A feeder with a preset second flow rate is arranged at the remaining positions;

[0017] The preset first flow rate is greater than the preset second flow rate, and both the preset first flow rate and the preset second flow rate are positively correlated with the thickness of the finished carbon fiber plate.

[0018] Furthermore, the pre-action roller pre-presses the other surface of the solidified semi-finished product along the action line of the pressure roller to generate the pre-pressed finished product, and the step of detecting the pre-pressed finished product includes:

[0019] Detecting the depth of the ribs on the pre-pressed finished product;

[0020] Determining whether to detect the thickness of the ribs on the pre-pressed finished product according to the detection result of the depth of the ribs on the pre-pressed finished product;

[0021] Wherein, the other surface of the cured semi-finished product is the other surface away from the action surface of the pressure roller.

[0022] Further, it is determined whether to detect the thickness of the ribs on the pre-pressed finished product according to the detection result of the depth of the ribs on the pre-pressed finished product, wherein:

[0023] If the depth measurement value of the upper rib of the pre-pressed finished product is greater than or equal to the depth setting value, then detecting the thickness of the upper rib of the pre-pressed finished product;

[0024] The depth setting value is positively correlated with the thickness of the finished carbon fiber plate.

[0025] Further, the determination of whether the pre-pressed finished product is qualified includes:

[0026] If the depth measurement value is less than the depth setting value, the pre-pressed finished product is determined to be qualified;

[0027] If the depth measurement value is greater than or equal to the depth setting value and the thickness measurement value is greater than the thickness setting value, the pre-pressed finished product is determined to be qualified;

[0028] If the thickness measurement value is less than or equal to the thickness setting value, the pre-pressed finished product is judged to be unqualified;

[0029] Wherein, the thickness setting value is positively correlated with the feeding flow rate of the feeder.

[0030] Furthermore, when it is determined that the pre-pressed finished product is unqualified, the pressing depth of the corresponding pre-action roller is reduced according to the depth measurement value.

[0031] Furthermore, the preset first flow rate is determined according to the thickness of the finished carbon fiber plate, and the preset second flow rate is determined according to the preset first flow rate and the rib depth of the finished carbon fiber plate.

[0032] Furthermore, the depth of the feeder with the preset first flow rate corresponding to the mold position is greater than the depth of the feeder with the preset second flow rate corresponding to the mold position.

[0033] Furthermore, the depth of the mold is smaller than the thickness of the pressure roller.

[0034] Furthermore, the qualified pre-pressed finished product is pressed by the pressure roller in a heated state so that the qualified pre-pressed finished product is completely cured to form the finished carbon fiber board.

[0035] Compared with the prior art, the beneficial effect of the present invention lies in that the flow rate of the feeder is determined according to the shape of the carbon fiber plate, and feeders with different flow rates are spliced, which increases the thickness of the cured semi-finished product at the deformation point of the carbon fiber plate, while effectively improving the structural safety and stability of the carbon fiber reinforced composite material.

[0036] Furthermore, by pre-pressing and then pressing the cured semi-finished product, the cured semi-finished product at the deformed part of the carbon fiber plate is stretched in a targeted manner, which makes the prepreg in the cured semi-finished product evenly distributed, and further improves the structural safety and stability of the carbon fiber reinforced composite material.

[0037] Furthermore, by detecting the rib depth of the pre-pressed product after pre-pressing, the quality of pre-pressing can be better controlled, which effectively improves the stability of pre-pressing and further improves the structural safety and stability of the carbon fiber reinforced composite material.

[0038] Furthermore, by detecting the thickness of the pre-pressed finished product with an excessive pre-pressing depth, the quality of the pre-pressed finished product after the pressing operation can be effectively guaranteed while the quality of the pre-pressed finished product is effectively controlled, further improving the structural safety and stability of the carbon fiber reinforced composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flow chart of a method for preparing a carbon fiber reinforced composite material of the present invention;

[0040] Figure 2 The corresponding cross-sectional structural diagram of the pressure roller and the feeder in the embodiment of the present invention;

[0041] Figure 3 The corresponding cross-sectional structure diagram of the pressure roller and the pre-action roller of the embodiment of the present invention;

[0042] Figure 4 The corresponding cross-sectional structure diagram of the mold and the pressure roller of the embodiment of the present invention;

[0043] Among them: 1, carbon fiber plate; 2, pressure roller; 3, feeder; 4, pre-action roller; 5, pre-pressed finished product; 6, mold. DETAILED DESCRIPTION

[0044] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 As shown, it is a flow chart of a method for preparing a carbon fiber reinforced composite material of the present invention, a method for preparing a carbon fiber reinforced composite material, comprising:

[0049] Step S1, determining the positions of the pressure roller and the pre-action roller of the hot press according to the shape of the carbon fiber plate;

[0050] Step S2, determining the feed flow rate of the feeder according to the position of the pressure roller, and setting the mold parameters at the corresponding mold position according to the feeder;

[0051] Step S3, laying carbon fiber in a mold and coating the prepreg on the carbon fiber through a feeder to generate carbon fiber prepreg;

[0052] Step S4, heating and pressurizing the carbon fiber prepreg to preliminarily cure it to generate a cured semi-finished product;

[0053] Step S5, using a pre-action roller to pre-press the solidified semi-finished product to generate a pre-pressed finished product, and detecting the depth of the ribs on the pre-pressed finished product to determine whether the pre-pressed finished product is qualified;

[0054] Step S6, using a pressure roller to press the qualified pre-pressed finished product to form a finished carbon fiber board;

[0055] Among them, the width and position of the pre-action roller are the same as those of the pressure roller; the pressing depth of the pre-action roller is less than that of the pressure roller; the feeder is a device for coating prepreg on carbon fiber; the mold parameters include the depth and width of the mold; the cured semi-finished product is a carbon fiber prepreg board that is preliminarily shaped by heating and pressurizing the carbon fiber prepreg; the pressing operation is to press the pre-pressed finished product into a finished carbon fiber board through the pressure roller of the hot press.

[0056] Specifically, in step S2, the step of determining the feeding flow rate of the feeder according to the position of the pressure roller includes:

[0057] Step S21, setting a feeder with a preset first flow rate at a position corresponding to the pressure roller;

[0058] Step S22, setting feeders with a preset second flow rate at other locations;

[0059] Example 1: Please refer to Figure 2 As shown, it is a corresponding cross-sectional structural diagram of the pressure roller and the feeder of an embodiment of the present invention; in this embodiment, the carbon fiber plate 1 is pressed and deformed to a depth of 20 cm and a width of 30 cm, and the position of the feeder 3 corresponding to the position of the pressure roller 2 selects a feeder of 200 cubic centimeters per minute, and the other positions select a feeder of 175 cubic centimeters per minute.

[0060] The preset first flow rate is greater than the preset second flow rate, and both the preset first flow rate and the preset second flow rate are positively correlated with the thickness of the finished carbon fiber plate.

[0061] In one embodiment, the thickness of the finished carbon fiber plate is 1 mm, the preset first flow rate is 150 cubic centimeters per minute, and the preset second flow rate is 125 cubic centimeters per minute;

[0062] The thickness of the finished carbon fiber plate is 2 mm, the preset first flow rate is 200 cubic centimeters per minute, and the preset second flow rate is 175 cubic centimeters per minute;

[0063] The thickness of the finished carbon fiber plate is 3 mm, the preset first flow rate is 250 cubic centimeters per minute, and the preset second flow rate is 225 cubic centimeters per minute;

[0064] Specifically, the flow rate of the feeder is determined according to the shape of the carbon fiber plate, and feeders with different flow rates are spliced ​​together. This increases the thickness of the cured semi-finished product at the deformation point of the carbon fiber plate, while effectively improving the structural safety and stability of the carbon fiber reinforced composite material.

[0065] Specifically, in step S5, the pre-action roller performs pre-compression on the other surface of the solidified semi-finished product along the action line of the pressure roller to generate a pre-compressed finished product, and the step of detecting the pre-compressed finished product includes:

[0066] Step S51, detecting the depth of the upper rib of the pre-pressed finished product;

[0067] Step S52, judging whether to detect the thickness of the upper ribs of the pre-pressed finished product according to the detection result of the depth of the upper ribs of the pre-pressed finished product;

[0068] Wherein, the other surface of the solidified semi-finished product is the other surface away from the action surface of the pressure roller.

[0069] Example 2, please refer to Figure 3 As shown, it is a corresponding cross-sectional structure diagram of the pressure roller and the pre-action roller of an embodiment of the present invention; on the basis of Example 1, this embodiment is different from it in that the carbon fiber plate 1 is pressed and deformed to a depth of 1 cm and a width of 30 cm, the pressure roller 2 is 1 cm deep and 30 cm wide, the pre-action roller 4 is 0.5 cm deep and 30 cm wide, and the pre-pressed finished product 5 is pressed and deformed to a depth of 0.5 cm and a width of 30 cm.

[0070] Specifically, by pre-pressing and then pressing the cured semi-finished product, the cured semi-finished product at the deformed part of the carbon fiber plate is stretched in a targeted manner, which makes the prepreg in the cured semi-finished product evenly distributed, and further improves the structural safety and stability of the carbon fiber reinforced composite material.

[0071] Specifically, in step S53, it is determined whether to detect the thickness of the upper rib of the pre-pressed finished product according to the detection result of the depth of the upper rib of the pre-pressed finished product, wherein:

[0072] If the depth measurement value of the upper rib plate of the pre-pressed finished product is greater than or equal to the depth setting value, the thickness of the upper rib plate of the pre-pressed finished product is detected;

[0073] Example 3: Based on Example 2, this example is different from it in that the depth setting value is 5 cm. If the depth measurement value of 5.5 cm is greater than the depth setting value of 5 cm, the thickness of the ribs on the pre-pressed finished product is detected.

[0074] Among them, the depth setting value is positively correlated with the thickness of the finished carbon fiber board.

[0075] In one embodiment, the finished carbon fiber plate has a thickness of 3 mm and a depth setting value of 5 cm;

[0076] The finished carbon fiber plate is 5 mm thick and the depth setting value is 8 cm;

[0077] The finished carbon fiber plate is 8 mm thick and the depth setting value is 10 cm.

[0078] Specifically, by detecting the rib depth of the pre-pressed product after pre-pressing, the quality of pre-pressing can be better controlled, which effectively improves the stability of pre-pressing and further improves the structural safety and stability of the carbon fiber reinforced composite material.

[0079] Specifically, in step S5, determining whether the pre-pressed finished product is qualified includes:

[0080] If the depth measurement value is less than the depth setting value, the pre-pressed finished product is judged to be qualified;

[0081] If the depth measurement value is greater than or equal to the depth setting value and the thickness measurement value is greater than the thickness setting value, the pre-pressed finished product is judged to be qualified;

[0082] If the thickness measurement value is less than or equal to the thickness setting value, the pre-pressed finished product is judged to be unqualified;

[0083] Embodiment 4: Based on Embodiment 3, this embodiment is different from it in that the depth setting value is 5 cm, the thickness setting value is 3 cm, and if the depth measurement value is 4.5 cm, which is less than the depth setting value of 5 cm, the pre-pressed finished product is determined to be qualified;

[0084] If the depth measurement value is 5.5 cm, which is greater than the depth setting value of 5 cm, and the thickness measurement value is 3.5 cm, which is greater than the thickness setting value of 3 cm, the pre-pressed finished product is determined to be qualified;

[0085] If the thickness measurement value of 2.5 cm is less than the thickness setting value of 3 cm, the pre-pressed finished product is judged to be unqualified, and the pressing depth of the corresponding pre-action roller is reduced according to the depth measurement value of 5.5 cm.

[0086] Among them, the thickness setting value is positively correlated with the feeding flow rate of the feeder.

[0087] In one embodiment, the feeder flow rate is 150 cubic centimeters per minute and the thickness setting value is 1.5 centimeters;

[0088] The feeder flow rate is 200 cubic centimeters per minute, and the thickness setting value is 2.5 centimeters;

[0089] The feeder flow rate was 250 cubic centimeters per minute and the thickness setting was 3.5 centimeters.

[0090] Specifically, by detecting the thickness of pre-pressed products with excessive pre-pressing depth, the quality of pre-pressed products after the pressing operation can be effectively guaranteed while the quality of pre-pressed products is effectively controlled, further improving the structural safety and stability of carbon fiber reinforced composite materials.

[0091] Specifically, when it is determined that the pre-pressed product is unqualified, the pressing depth of the corresponding pre-action roller is reduced according to the depth measurement value.

[0092] Specifically, the preset first flow rate is determined according to the thickness of the finished carbon fiber plate, and the preset second flow rate is determined according to the preset first flow rate and the rib depth of the finished carbon fiber plate.

[0093] It is understandable that, for those skilled in the art, it is obvious to determine the flow rate of the feeder at the corresponding position according to the thickness of the finished carbon fiber plate at different positions and the rib depth of the finished carbon fiber plate, which will not be described in detail here.

[0094] Specifically, the depth of the feeder with the preset first flow rate corresponding to the mold position is greater than the depth of the feeder with the preset second flow rate corresponding to the mold position.

[0095] Specifically, the depth of the mold is smaller than the thickness of the pressure roller.

[0096] See also Figure 4 As shown, it is a corresponding cross-sectional structure diagram of the mold and pressure roller of an embodiment of the present invention, the pressure roller 2 is 1 cm deep and 30 cm wide, the mold 6 is 0.3 cm deep and 30 cm wide, and the depth of the mold is less than the thickness of the pressure roller.

[0097] Specifically, the qualified pre-pressed finished product is pressed by a pressure roller in a heated state so that the qualified pre-pressed finished product is completely cured to form a finished carbon fiber board.

[0098] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a carbon fiber reinforced composite material, characterized in that: include: Determine the positions of the pressure roller and pre-action roller of the hot press according to the shape of the carbon fiber plate; Determine the feed flow rate of the feeder according to the position of the pressure roller, and set the mold parameters at the corresponding mold position according to the feeder; Laying carbon fibers in a mold and coating the prepreg on the carbon fibers through the feeder to generate carbon fiber prepreg; The carbon fiber prepreg is heated and pressurized to initially cure to generate a cured semi-finished product; Using the pre-action roller to pre-press the solidified semi-finished product to generate a pre-pressed finished product, and detecting the depth of the ribs on the pre-pressed finished product to determine whether the pre-pressed finished product is qualified; Using the pressure roller to press the qualified pre-pressed finished product to form a finished carbon fiber plate; Wherein, the width and position of the pre-action roller are the same as those of the pressure roller; the pressing depth of the pre-action roller is less than the pressing depth of the pressure roller; and the mold parameters include the depth and width of the mold.

2. The method for preparing a carbon fiber reinforced composite material according to claim 1, characterized in that: The step of determining the feeding flow rate of the feeder according to the position of the pressure roller comprises: A feeder with a preset first flow rate is arranged corresponding to the position of the pressure roller; A feeder with a preset second flow rate is arranged at the remaining positions; The preset first flow rate is greater than the preset second flow rate, and both the preset first flow rate and the preset second flow rate are positively correlated with the thickness of the finished carbon fiber plate.

3. The method for preparing a carbon fiber reinforced composite material according to claim 2, characterized in that: The pre-action roller pre-presses the other surface of the solidified semi-finished product along the action line of the pressure roller to generate the pre-pressed finished product, and the step of detecting the pre-pressed finished product includes: Detecting the depth of the ribs on the pre-pressed finished product; Determining whether to detect the thickness of the ribs on the pre-pressed finished product according to the detection result of the depth of the ribs on the pre-pressed finished product; Wherein, the other surface of the solidified semi-finished product is the other surface away from the action surface of the pressure roller.

4. The method for preparing a carbon fiber reinforced composite material according to claim 3, characterized in that: According to the detection result of the depth of the upper rib of the pre-pressed finished product, it is determined whether to detect the thickness of the upper rib of the pre-pressed finished product, wherein: If the depth measurement value of the upper rib of the pre-pressed finished product is greater than or equal to the depth setting value, then detecting the thickness of the upper rib of the pre-pressed finished product; The depth setting value is positively correlated with the thickness of the finished carbon fiber plate.

5. The method for preparing a carbon fiber reinforced composite material according to claim 4, characterized in that: The step of determining whether the pre-pressed finished product is qualified includes: If the depth measurement value is less than the depth setting value, the pre-pressed finished product is determined to be qualified; If the depth measurement value is greater than or equal to the depth setting value and the thickness measurement value is greater than the thickness setting value, the pre-pressed finished product is determined to be qualified; If the thickness measurement value is less than or equal to the thickness setting value, the pre-pressed finished product is judged to be unqualified; Wherein, the thickness setting value is positively correlated with the feeding flow rate of the feeder.

6. The method for preparing a carbon fiber reinforced composite material according to claim 5, characterized in that: When it is determined that the pre-pressed finished product is unqualified, the pressing depth of the corresponding pre-action roller is reduced according to the depth measurement value.

7. The method for preparing a carbon fiber reinforced composite material according to claim 2, characterized in that: The preset first flow rate is determined according to the thickness of the finished carbon fiber plate, and the preset second flow rate is determined according to the preset first flow rate and the rib depth of the finished carbon fiber plate.

8. The method for preparing a carbon fiber reinforced composite material according to claim 7, characterized in that: The depth of the feeder with the preset first flow rate corresponding to the mold position is greater than the depth of the feeder with the preset second flow rate corresponding to the mold position.

9. The method for preparing a carbon fiber reinforced composite material according to claim 8, characterized in that: The depth of the mold is smaller than the thickness of the pressure roller.

10. The method for preparing a carbon fiber reinforced composite material according to claim 9, characterized in that: The qualified pre-pressed finished product is pressed by the pressure roller in a heated state so that the qualified pre-pressed finished product is completely cured to form the finished carbon fiber board.

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