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How is carbon fiber made?

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How is carbon fiber made?

1. Cutting

The prepreg is taken out from the cold storage at minus 18 degrees Celsius, after waking up the material, the first step is to cut accurately in the automatic cutting machine according to the material chart.


The prepregs are paved on the paving tooling, with different layers according to the design requirements, and all the processes are carried out under laser positioning.


Through automated handling robots, the pre-molded material will be sent to the molding machine for molding (PCM), Huatech can now do 5-10 minutes molding, with 800-1000 tons of presses, can be molded all kinds of large-scale workpieces.


After molding, the workpiece is sent to the cutting robot workstation for the fourth step of cutting and deburring to ensure the dimensional accuracy of the workpiece, which can also be operated on the CNC.


Dry ice cleaning is carried out in the cleaning station to remove the mold release agent, which is convenient for the gluing process.


In the gluing robot station to play the structural glue, gluing position, gluing speed and the amount of glue have been accurately adjusted. Part of the connection with the metal parts using riveting mode, in the riveting station.

7、Assembly Inspection

After gluing, complete the assembly of internal and external boards, and carry out blue light inspection after the glue is cured to ensure the dimensional accuracy of key holes, points, lines and surfaces.

  Carbon fiber is a new material with excellent mechanical properties, combining the two characteristics of carbon material, strong tensile strength and soft processability of fibers. Take carbon fiber and our common steel, the strength of carbon fiber in the 400 to 800 MPa or so, while the strength of ordinary steel for 200 to 500 MPa. When you look at toughness, carbon fiber and steel are basically similar, with no significant difference. Carbon fiber has higher strength and lighter weight, so carbon fiber can be called the king of new materials. Because of this advantage, carbon fiber reinforced composites (CFRP) in the process, the matrix and fiber there are more complex internal interactions, so that its physical properties and metal have a greater difference, CFRP density is much smaller than metal, and the strength is greater than the vast majority of metals. CFRP density is much smaller than metal, while the strength is greater than most metals. Because of the inhomogeneity of CFRP, in the process of processing often appear fiber pulling out or matrix fiber detachment; CFRP has a high degree of heat resistance and abrasion resistance, so that it is in the process of processing the higher requirements of the equipment, and therefore the production process produces a lot of cutting heat on the more serious wear and tear of the equipment. At the same time, the continuous expansion of its application areas, the requirements are more and more delicate, the applicability of the material to make the requirements, the quality of CFRP requirements are more and more demanding, but also lead to the processing cost upward. After the curing and forming of carbon fiber board, in order to meet the precision requirements or assembly needs, it is necessary to carry out post-processing such as cutting and drilling. Under the same conditions of cutting process parameters, cutting depth, etc., the selection of different materials, sizes, shapes of tools and drills, the effect is very different, and at the same time, the strength of the tools and drills, direction, time and temperature and other factors will also affect the results of processing. During post-processing, try to choose sharp tools with diamond coating and drills with integral carbide. The wear resistance of the tools and drills themselves determines the quality of the processing and the service life of the tools. If the tools and drills are not sharp enough or used improperly, they will not only accelerate the wear and increase the processing cost of the product, but also cause damage to the plate, affecting the shape and size of the plate as well as the stability of the dimensions of the holes, slots and other processed parts of the plate, and in serious cases, the material will be torn in layers, or even chunks of the material will fall off, resulting in the scrapping of the whole plate. When drilling carbon fiber plates, the faster the rotational speed, the better the result. Drill selection, PCD8 face edge drill unique tip design is more suitable for carbon fiber plate, can better penetrate the carbon fiber plate, reduce the risk of delamination, the thicker carbon fiber plate cutting, it is recommended to use the left and right spiral edge design of the double-edged compression milling cutter, this sharp cutting edge at the same time with the upper cut and the lower cut of the helical tip, cutting the balance of the tool up and down axial force, to ensure that the cutting force will be This balances the axial force between the top and bottom of the tool during cutting and ensures that the cutting force is directed toward the inside of the material to achieve stable cutting conditions and suppress delamination of the material. The upper and lower diamond-shaped cutting edges of the "Pineapple Edge" milling cutter can also effectively cut off the carbon fiber sheet, and its deeper chip removal groove can take away a large amount of cutting heat through the chip discharge during the cutting process to avoid damaging the performance of the carbon fiber sheet.



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