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Reasons Why Carbon Fiber Materials Are Difficult To Process

Carbon fiber is a microcrystalline graphite material obtained by carbonizing and graphitizing organic fibers. It is a new material with excellent mechanical properties. Carbon fiber and its composite materials have been widely used in various fields of military and civilian industries, such as aerospace. , aviation, automobiles, electronics, machinery, chemical etching industry, etc. Therefore, carbon fiber is considered a typical representative of new industrial materials in high-tech fields.Carbon fiber is a hot new type of structural material. It has outstanding advantages in mechanical, thermal, chemical and other properties. However, carbon fiber is a difficult material to process, so why is carbon fiber difficult to process? Let’s find out in this article.

Carbon fiber composite materials have high strength, and their tensile strength, bending strength, stiffness, and shear strength are better than most structural materials. Therefore, in the process of carbon fiber machining, there are certain requirements for china cnc machining tools, which is easy to cause tool wear. Different from other structural materials, carbon fiber has anisotropic properties, and its properties are different in different directions.

For example, the strength of vertical fibers is outstanding, so there are certain problems in the 5 axis machining process. The mechanical properties of carbon fiber composites are outstanding, so they can play a reinforcing role, but they are brittle, and the stress concentrates on one point during drilling operations, which is easy to cause defects such as splitting and delamination.

Characteristics Of Carbon Fiber Composite Materials

  • High strength (5 times that of steel)
  • Excellent temperature resistance (can withstand high temperatures of about 3000°C)
  • Excellent thermal shock resistance
  • Low linear expansion coefficient (small deformation)
  • Small thermal conductivity (environmental protection and energy saving)
  • Small specific gravity (1/5 of steel)
  • Excellent resistance to corrosion and radiation sources

Carbon Fiber Composites Difficult To Process

Carbon fiber composite material is a material that is difficult to machine. Its density is much smaller than that of metal, but its strength is greater than most metals. Due to the unevenness of CFRP, fiber pullout or matrix fiber detachment often occurs during processing. .

Carbon fiber composite materials have poor thermal conductivity, so the use of coolant is prohibited during the cutting process. As a result, the generated cutting heat cannot be dissipated quickly, thereby transferring the heat to the cutting tool, exacerbating the wear of the cutting equipment and greatly reducing its service life. At the same time, the surface heat of the workpiece is intensified, which affects the surface molding of the composite material and reduces the performance of the composite material during use.

Carbon Fiber Material Milling Machining

When precision milling carbon fiber materials, there is a complex interaction between the end mill and CFRP, which can easily cause uncut fiber yarns and delamination in the CFRP workpiece. In order to reduce and avoid similar defects, it is necessary to scientifically predict the cutting force and the occurrence of shaft delamination and uncut fiber yarn burrs in the early stages of processing. Reasonable selection of tools and control of processing process parameter settings will effectively reduce Eliminates the generation of burrs and edges.

The main process parameters of carbon fiber material edge milling, such as fiber orientation, axial and tangential feed speed, cutting speed, etc., will have a significant impact on the surface roughness of the workpiece. In high-speed milling, the milling force decreases with the increase of rotation speed, and increases with the increase of axial depth of cut, radial depth of cut and feed speed. As the milling speed increases, the milling temperature increases, causing the friction coefficient to decrease and the deformation coefficient to decrease. Therefore, the cutting force per unit area will decrease, so the cutting force has a tendency to decrease. As the feed rate increases, the cutting thickness of each tooth cutting into the workpiece increases during milling, the volume milled per unit time increases, and the milling force increases accordingly. Therefore, when milling carbon fiber composite materials, in order to reduce the milling force, high speeds should be used , perform cutting processing with a small depth of cut and multiple passes.

4036 DC-T-ER11 high speed electric spindle

4036 DC-T-ER11 is a high-speed electric spindle imported from Germany suitable for edge milling and up milling of carbon fiber materials. It adopts a radial + axial flexibility system. The contact pressure with the workpiece can be pneumatically adjusted to maintain consistent pressure at 360°. And the spindle has the characteristics of large torque, high speed, high precision, small size, light weight, sealing gas cooling, etc. Its speed can reach up to 60,000 min-1, the maximum torque is 27Ncm, and the maximum power is 850W, making it suitable for milling carbon fiber materials. Reduce the generation of burrs and obtain better surface quality.

In the process of carbon fiber machining, the commonly used machining methods are turning, which is widely used and the most basic. Then there is milling, which is a method of remachining carbon fiber products, and when the parts need to be assembled Drilling is required.

China Be-cu Prototype Material Technology Co., Ltd. is a powerful manufacturer of carbon fiber products. The company has large-scale hot presses, autoclaves, hydraulic forming tables, CNC high-speed milling machines and other large-scale equipment. The products produced by the company are all Made of raw materials from well-known brands such as Taiwan and Japan, the quality is guaranteed.


ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.