Carbon fiber composite material and metal piece compounded cap-shaped beam component and preparation method thereof

Abstract

The invention discloses a cap-shaped beam component compounded by a carbon fiber composite material and a metal piece, the cap-shaped beam component comprises a cap-shaped carbon fiber composite material piece and the metal piece, the cap-shaped carbon fiber composite material piece comprises a main body and turnups arranged on two sides of the main body; the two sides of the metal piece are connected with the turned-over edges of the cap-shaped carbon fiber composite material piece in a glued mode through structural adhesives. The content ratio of the carbon fibers to the resin matrix of the cap-shaped carbon fiber composite material part is 55: 45-60: 40; and the resin also comprises 1-2% of carbon black or carbon powder. Through the structural design and the reasonable design of the resin and the carbon fibers, the structural part can still keep the rigidity value of 85% or above after being baked by electrophoretic paint at the temperature of 180 DEG C.

Description

Technical Field

[0001] The invention belongs to the field of composite material preparation, and in particular relates to a cap-shaped beam component composited with a carbon fiber composite material and a metal part and a preparation method thereof. Background Art

[0002] At present, with the development and application trend of lightweight car bodies, carbon fiber composite materials are increasingly used in automobiles due to their natural advantages in weight reduction. However, it cannot be ignored that the most widely used carbon fiber composite materials on car bodies are still automobile interior and exterior trims, and there are few cases of large-scale application of structural parts. In addition to the price factor of carbon fiber composite materials, when traditional carbon fiber composite materials are installed on the car body and baked by electrophoretic paint, the performance of the composite materials will be attenuated due to high temperature, affecting the overall safety of the car body. At present, the baking temperature of composite materials through electrophoretic paint reported abroad is a case of BMW cars, the baking temperature of the electrophoretic paint is 150℃, and the baking time is 30min. The current baking temperature of electrophoretic paint in China is 180℃-210℃, and the baking time is 30min. When the baking time is certain but the baking temperature is higher, it is a great challenge for composite materials as structural parts to meet the physical and chemical properties. Summary of the invention

[0003] Therefore, the object of the present invention is to provide a composite material component that can withstand high temperature electrophoretic paint baking and can maintain a stiffness value of more than 85% after high temperature baking.

[0004] The technical solution adopted by the present invention to solve the technical problem is: A hat-shaped beam component composited with a carbon fiber composite material and a metal part comprises a hat-shaped carbon fiber composite part and a metal part, wherein the hat-shaped carbon fiber composite part comprises a main body and flanges arranged on both sides of the main body; the length and width of the metal part are adapted to the hat-shaped carbon fiber composite part, and the two side edges of the metal part are connected to the flanges of the hat-shaped carbon fiber composite material.

[0005] Furthermore, the flanges on both sides of the cap-shaped carbon fiber composite material part are bonded to the side edges of the metal part by means of structural adhesive, wherein the structural adhesive is specifically acrylic structural adhesive, and the operation time of the structural adhesive at room temperature is 5-10 minutes and the curing time is 2-4 hours.

[0006] Furthermore, the carbon fiber composite material comprises carbon fiber and resin matrix, wherein the mass content of the carbon fiber and the resin matrix is ​​55:45-60:40; the resin matrix is ​​a medium-temperature epoxy resin matrix. The medium-temperature epoxy resin refers to an epoxy resin system with a curing temperature below 150°C.

[0007] Furthermore, the medium-temperature epoxy resin matrix also contains 1-2%wt of carbon black or carbon powder.

[0008] Furthermore, the preparation method of the hat-shaped beam component composited with the carbon fiber composite material and the metal part comprises the following steps: Step 1: Cutting: Cut the carbon fiber fabric into a specified shape; Step 2: Laying: Lay the cut carbon fiber fabric layers in the mold according to the design requirements; Step 3: Preforming in mold: Put the laid carbon fiber fabric layer into the mold, and pressurize the mold through a press to make the laid carbon fiber fabric layer initially form a cap-shaped preform; Step 4: coating resin: coating the cap-shaped preform obtained in step 3 with resin evenly; Step 5: Compression molding: The mold is pressed by applying a certain pressure and temperature to the mold through a press, the temperature is 120-150°C, the pressure is 2000-2500kN, and the heat preservation and pressure holding time is 3-10min; Step 6: Post-curing: demould the molded product and place it in the post-curing tooling, and bake it in an oven at 150°C for 30-35 minutes; Step 7: Bond the hat-shaped carbon fiber composite material component to the metal component.

[0009] Furthermore, the configuration of the resin matrix includes the following steps: adding 1-2%wt of carbon black or carbon powder to the medium-temperature epoxy resin, and stirring it thoroughly to form a resin mixture; adding a curing agent to the resin mixture, stirring it with a centrifugal mixer and vacuum degassing it to obtain a uniformly mixed resin matrix.

[0010] The cap-shaped beam component of the carbon fiber composite material and metal parts of the present invention adopts a method of connecting a cap-shaped carbon fiber composite material part with a metal part to form a cap-shaped beam structure, and a reasonable ratio of carbon fiber and resin matrix is ​​adopted to achieve a stiffness value of 85% after high-temperature baking at above 180°C for 30 minutes, and there are no new surface defects or other undesirable effects on the appearance after baking. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a structural schematic diagram of a hat-shaped carbon fiber composite material component; Attached Figure 2 For attachment Figure 1 Left view of; Attached Figure 3 It is a schematic diagram of the hat beam structure; Attached Figure 4 For attachment Figure 3 Left view of; Wherein: 1-hat-shaped carbon fiber composite material part, 11-hat-shaped carbon fiber composite material body, 12-flange; 2-metal part. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the embodiments.

[0013] like Figure 1-4 As shown, a hat-shaped beam component of a carbon fiber composite material and a metal part comprises a hat-shaped carbon fiber composite part 1 and a metal part 2; the hat-shaped carbon fiber composite part comprises a main body 11 and flanges 12 arranged on both sides of the main body; the two side edges of the metal part 2 are bonded to the flanges 12 of the hat-shaped carbon fiber composite part 1 by structural adhesive.

[0014] In the cap-shaped carbon fiber composite material, the mass percentage of carbon fiber to resin matrix is ​​55:45-60:40; and the resin matrix contains 1-2% of carbon black or carbon powder.

[0015] The preparation example of the hat-shaped beam component composited with carbon fiber composite materials and metal parts is as follows: Example 1

[0016] A preparation process of a carbon fiber composite material and a metal part composite hat beam component comprises the following steps: Step 1: Prepare the resin matrix: add 2%wt carbon black or carbon powder to the medium temperature epoxy resin and stir well; add the curing agent to the mixed solution obtained in step 1, stir and vacuum degas in a centrifugal mixer to obtain a uniformly mixed resin matrix, the time is 60s, and the vacuum degree is -0.94bar; The second step is to prepare a hat-shaped carbon fiber composite material part, which specifically includes the following process: Cutting: Cut the carbon fiber fabric into specified shapes; Laying: Lay the cut carbon fiber fabric layers in the mold according to the design requirements; Preforming in mold: put the laid carbon fiber fabric layer into the mold, and pressurize the mold through a press to make the laid carbon fiber fabric layer initially form a cap-shaped preform; Resin coating: the hat-shaped preform is evenly coated with a resin matrix, and the mass percentage of the resin matrix to the carbon fiber is 60:40; Compression molding: The press machine applies a certain pressure and temperature to the mold for compression molding. The temperature is controlled at 120-130℃, the pressure is controlled at 2000-2500kN, and the heat preservation and pressure holding time is 3-5min. Post-curing: After demoulding, the molded product is placed in the post-curing tooling and baked in an oven at 150 degrees Celsius for 30-35 minutes; Step 3: Gluing: Glue the hat-shaped carbon fiber composite material parts and the metal parts with acrylic structural adhesive to obtain the hat-shaped beam component. Example 2

[0017] A preparation process of a carbon fiber composite material and a metal part composite hat beam component comprises the following steps: Step 1: Prepare the resin matrix: add 1%wt carbon black or carbon powder to the medium temperature epoxy resin and stir well; add the curing agent to the mixed solution obtained in step 1, stir and vacuum degas in a centrifugal mixer to obtain a uniformly mixed resin matrix, the time is 40s, and the vacuum degree is -0.94bar; The second step is to prepare a hat-shaped carbon fiber composite material part, which specifically includes the following process: Cutting: Cut the carbon fiber fabric into specified shapes; Laying: Lay the cut carbon fiber fabric layers in the mold according to the design requirements; Preforming in mold: put the laid carbon fiber fabric layer into the mold, and pressurize the mold through a press to make the laid carbon fiber fabric layer initially form a cap-shaped preform; Resin coating: the hat-shaped preform is evenly coated with a resin matrix, and the mass percentage of the resin matrix to the carbon fiber is 55:45; Compression molding: The mold is pressed by a press machine with a certain pressure and temperature. The temperature is controlled at 130-150℃, the pressure is controlled at 2000-2500kN, and the heat preservation and pressure holding time is 5-10min. Post-curing: After demoulding, the molded product is placed in the post-curing tooling and baked in an oven at 150 degrees Celsius for 30-35 minutes; Step 3: Gluing: Glue the hat-shaped carbon fiber composite material parts and the metal parts with acrylic structural adhesive to obtain the hat-shaped beam component.

[0018] The hat-shaped beam components obtained in Example 1 and Example 2 were treated in an electrophoretic paint baking environment at 180 degrees Celsius for 30 minutes, and then the bending stiffness retention rate and whether there were new appearance defects were used to characterize the performance of the product. In this application, the bending stiffness retention rate refers to the percentage of the bending stiffness of the hat-shaped component after electrophoretic paint baking at 180 degrees Celsius divided by the bending stiffness before electrophoretic paint baking at 180 degrees Celsius. The bending stiffness retention rate of Example 1 is greater than 85%, and the product has no new appearance defects; the bending stiffness retention rate of Example 2 is 90%, and the product has no new appearance defects.

Claims

1. A hat-shaped beam component composed of a carbon fiber composite material and a metal part, characterized in that It comprises a hat-shaped carbon fiber composite material part and a metal part. The hat-shaped carbon fiber composite material part comprises a main body and flanges arranged on both sides of the main body. The length and width of the metal part are adapted to the size of the hat-shaped carbon fiber composite material part, and its two side edges are connected to the flanges of the hat-shaped carbon fiber composite material part.

2. The hat-shaped beam component of carbon fiber composite material and metal parts according to claim 1, characterized in that The flanges on both sides of the cap-shaped carbon fiber composite material part are bonded to the side edges of the metal part by means of structural adhesive, and the structural adhesive is acrylic structural adhesive.

3. The hat-shaped beam component of carbon fiber composite material and metal parts according to claim 1, characterized in that The hat-shaped carbon fiber composite material part comprises carbon fiber and a resin matrix, and the mass content ratio of the carbon fiber to the resin matrix is ​​55:45-60:

40.

4. The hat-shaped beam component of carbon fiber composite material and metal parts according to claim 3, characterized in that The resin matrix is ​​a medium-temperature epoxy resin matrix.

5. The hat-shaped beam component of carbon fiber composite material and metal parts according to claim 4, characterized in that The medium-temperature epoxy resin matrix also contains 1-2%wt of carbon black or carbon powder.

6. The hat-shaped beam component of carbon fiber composite material and metal parts composite according to any one of claims 1 to 5, characterized in that The preparation method comprises the following steps: Step 1: Cutting: Cut the carbon fiber fabric into a specified shape; Step 2: Laying: Lay the cut carbon fiber fabric layers in the mold according to the design requirements; Step 3: Preforming in mold: Place the laid carbon fiber fabric layer into the mold, and pressurize the mold through a press so that the laid carbon fiber fabric layer initially forms a hat beam shape; Step 4: coating resin: coating the preform obtained in step 3 with resin evenly; Step 5: Compression molding: The mold is pressed by applying a certain pressure and temperature to the mold through a press, the temperature is 120-150°C, the pressure is 2000-2500kN, and the heat preservation and pressure holding time is 3-10min; Step 6: Post-curing: After demoulding, the molded product is placed in a post-curing tooling and baked in an oven at 150 degrees Celsius for 30-35 minutes; Step 7: Bond the hat-shaped carbon fiber composite material component to the metal component.

7. The hat-shaped beam component of carbon fiber composite material and metal parts according to claim 5, characterized in that The resin matrix is ​​configured by adding 1-2%wt of carbon black or carbon powder to a medium-temperature epoxy resin, and stirring the mixture to form a resin mixture; then adding a curing agent to the resin mixture, stirring the mixture with a centrifugal mixer, and vacuum degassing the mixture to obtain a uniformly mixed resin matrix.

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