Carbon fiber is a high-strength, high-modulus fiber with a carbon content of more than 90%. High temperature resistance ranks first among all chemical fibers. It is made of acrylic fiber and viscose bai glue fiber as raw material, which is oxidized and carbonized at high temperature. It is an excellent material for manufacturing high-tech equipment such as aerospace and aviation. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, heat conduction and corrosion resistance. The appearance is fibrous, soft, and can be processed into various fabrics. Because of its graphite microcrystalline structure preferentially oriented along the fiber axis, it has a high Strength and modulus. Carbon fiber has a low density, so its specific strength and specific modulus are high. The main purpose of carbon fiber is to composite with resin, metal, ceramics and carbon as a reinforcing material to make advanced composite materials. Carbon fiber reinforced epoxy resin composites have the highest specific strength and specific modulus among existing engineering materials.

Carbon fiber cloth is similar to cloth, light in weight, thin in thickness, and soft in texture. It can be cut at will and is woven from carbon filaments. The thickness of carbon fiber cloth is 0.167mm for 300g and 0.111mm for 200g. It is suitable for the treatment of increasing building load, changing the function of engineering use, material aging, concrete strength grade lower than the design value, structural crack treatment, service component repair and protection in harsh environments. And it can greatly help the structure in terms of shear resistance, seismic resistance and bending resistance. In use, it can be pasted in multiple layers according to engineering design requirements. It is recommended that no more than 4 layers are used. Because carbon fiber is posted in multiple layers at the same time, the tension attenuation will cause waste. Carbon fiber board is a carbon fiber composite material hardened by carbon fiber precursor and resin, similar to steel plate. The thickness of HobbyCarbon carbon fiber board is 1.2mm and 1.4mm, as well as 2.0mm and 3.0mm. It can play a very significant effect in structural bending resistance, and is often used in bridge reinforcement projects.

Carbon fiber tube, also known as carbon fiber tube, also known as carbon tube, carbon fiber tube, is made of carbon fiber prepreg wound on a core mold according to a certain layering pattern and cured at high temperature. In the manufacturing process, various profiles can be produced through different molds, such as: carbon fiber round tubes of different specifications, square tubes of different specifications, sheets of different specifications, and other profiles: 3K can also be packaged during the production process Surface packaging beautification and so on. The main reason why carbon fiber tubes can be favored is that carbon fiber composite materials have the characteristics of light weight and high strength. The carbon fiber square tubes have high strength and low density, which can fully realize the lightweight structure, and its mechanical properties are also very outstanding, and the tensile strength , Bending strength and rigidity are better than most metal structural materials. The strength can reach more than 3000MPa, which can be used for the production of various lightweight structural parts and mechanical arm rods. And high temperature resistance, corrosion resistance, aging resistance, can effectively extend the service life. The production of carbon fiber round pipes is to roll the prepreg on an inner core mold. Unlike the production of round pipes, the production of carbon fiber square pipes requires opening the entire pipe mold. First, we cut the required prepreg according to the specifications and performance requirements of the required square tube, and then manually lay the prepreg according to technical requirements and roll it. Before rolling, we need to use a wooden square tube and The inflatable bag is rolled on this basis. When all the prepregs are finished, take out the wooden square tube covered with the inflatable bag, and then put the carbon fiber square tube into the mold, close the mold, and put it in high temperature Curing furnace to solidify and shape. The size of the carbon fiber square tube is not fixed. In addition to some commonly used sizes, we can also customize it according to customer needs. And the same size, if the carbon fiber material used is different, the price will also be very different. Therefore, there is no fixed price list for carbon fiber square pipes, and they are all quoted according to customer's customized size and material requirements.

K represents the number of carbon fiber monofilaments per share. K is actually the English abbreviation of thousand. 1K carbon fiber filament contains 1,000 monofilaments. Similarly, 3K is 3,000. Because the production process is very troublesome. The size of K is related to resistance. The larger the K number, the smaller the resistance. If it is used for heating, the smaller the resistance. The heating wire of the same length will generate more heat and power. If it is used for reinforcement, the larger the K number, the higher the strength. As for 1k is more expensive than 3k because of the manual problem, the 1k process will be more complicated than 3k~ But 3k is the most cost-effective carbon fiber Another point is that the grid sizes of 1k and 3k are different. The picture above is 1k plain weave size The picture below shows 3k twill.

The carbon fiber tube is light in weight and high in strength. It can be applied to different parts of the drone body during design and assembly, such as the arm and wing frame. Compared with aluminum alloy material, it can increase the weight reduction effect by 30%, which can improve the aircraft, endurance and increase load capacity. The carbon fiber material itself has high tensile strength, energy absorption, shock resistance, and good corrosion resistance, which also extend the service life of the UAV. Through research on its own customers, we found that most consumer-grade aerial photography drones and agricultural plant protection drones use carbon fiber tubes as the main structure, which can not only reduce the weight of the drone, increase the endurance, but also increase the Human machine life.

Carbon fiber reinforced composite materials actually use a lot of carbon fibers, arranged in a certain direction, and then tightly connected by resin or other bonding materials. For example, as shown in the figure below, the cylinders are carbon fibers, and these cylinders are filled with resin in the middle. The distribution density of these fibers directly affects the final material properties. Because of this, we can control the final performance of carbon fiber materials by adjusting the fiber volume fraction, which is the fiber volume ratio. Simply, the denser the fiber, the more fibers per unit volume, and the higher the strength along the fiber direction; conversely, the sparser the fiber, the fewer fibers per unit volume, and the lower the strength of the final carbon fiber material. For carbon fibers used in market, the arrangement of fibers can be either in a single direction or in multiple directions. Of course, the most commonly used one is multi-directional cross, which is the appearance of carbon fiber that we usually use. For example, this is a single direction. Below is a multi-directional cross, the appearance of our common carbon fiber is this two-way cross texture. The original carbon fiber material is like this, in fact, it is more like cloth, which can be bent and rolled into a roll.

Principle of Fiber Orientation Fiber orientation has a significant impact on the interaction between the CFRP workpiece and the tool interface, and chip formation is closely related to fiber orientation. The fracture of the contact surface between the CFRP workpiece and the tool is caused by the pressure exerted by the tool tip. In terms of multiple fiber orientations, there are 3 cutting mechanisms: (1) The fiber breaks along the direction of the contact surface between the fiber and the matrix, that is, the fiber orientation is 0°. (2) When the cutter shears, the direction is perpendicular to the fiber axis, and the fiber orientation is 75°. (3) The fiber orientation is 90° or even a negative angle. The fiber direction angles of 30°, 60°, and 90° are the most critical directions. They will cause large cutting forces, concentrated wear and workpiece damage. By increasing the tool clearance angle, you can Effectively reduce the feed thrust.

The use of carbon fiber board knives CFRP is a difficult-to-machine material, mainly because it wears very quickly to the tool. The wear mechanism of the tool during the machining process is: when the workpiece is processed on the tool, the two surfaces are in large contact. During the machining process, long-term wear and vibration will cause the hard particles on the tool to occasionally separate, thus forming the so-called Tool wear. The wear type can be roughly divided into tool damage and wear. According to the location of wear, wear can be divided into tool tip wear, tool side wear, tool edge damage and edge wear. There are many factors that affect tool wear, mainly including: machining process parameters, tool geometry and materials. In the CFRP cutting process, process parameters (such as cutting speed, feed rate, fiber orientation, etc.) will significantly affect tool wear. Generally speaking, an increase in cutting speed will increase side wear. Tool geometry and material have a significant impact on machined surfaces, chip formation, cutting forces and tool wear.

What carbon fiber material? High-strength, high-modulus fiber with carbon content above 90%. High temperature resistance ranks first among all chemical fibers. It is made of acrylic fiber and viscose fiber as raw materials, after high temperature oxidation and carbonization. It is an excellent material for manufacturing high-tech equipment such as aerospace and aviation. A special fiber composed of carbon elements. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, heat conduction and corrosion resistance. The appearance is fibrous, soft, and can be processed into various fabrics. Because of its graphite microcrystalline structure is preferably oriented along the fiber axis, it has a high Strength and modulus. Carbon fiber has a low density, so its specific strength and specific modulus are high. The main purpose of carbon fiber is to compound with resin, metal, ceramic and carbon as a reinforcing material to make advanced composite materials. Carbon fiber reinforced epoxy resin composites have the highest specific strength and specific modulus among existing engineering materials.

Difficulties in processing carbon fiber composite materials During the processing of carbon fiber reinforced composite materials (CFRP), the matrix and fiber have a relatively complicated internal interaction, which makes their physical properties quite different from metals. The density of CFRP is much smaller than that of metals, and the strength is greater than that of most metals. Because of the unevenness of CFRP, fiber pull-out or detachment of matrix fibers will often occur during processing; CFRP has higher heat resistance and wear resistance, which makes it more demanding on equipment during processing, because A large amount of cutting heat generated during the production process is more serious for equipment wear. At the same time, the continuous expansion of its application fields, the requirements are becoming more and more refined, the requirements for the applicability of materials, and the quality requirements for CFRP are becoming more and more stringent, which also causes the processing cost to rise.