Research on Drilling of Carbon Fiber Board

Carbon fiber composite materials have the advantages of light weight, high strength, impact resistance, corrosion resistance, and low thermal expansion coefficient, and become one of the four major aviation structural materials after aluminum, steel, and titanium. The carbon fiber board made of it needs to be drilled and connected during actual use. However, due to the brittleness of carbon fiber composite materials, delamination and tearing will occur under the action of cutting force. These defects are particularly serious when drilling. As a result, the processing quality is difficult to guarantee, so how to improve the processing quality when drilling?

1. Delamination and tearing problems

In the drilling process, if the tool is not sharp enough, the processing process will be slow, the friction between the tool and the carbon fiber board will increase, which will cause the temperature of the drilled part to rise, and it is easy to cause drilling defects. Since the carbon fiber board is a composite of carbon fiber and resin matrix, the thermal expansion coefficient, strength and other properties of the two materials are different, so when there is a strong cutting force, defects such as delamination and fracture are prone to occur. It is recommended to use appropriate tools and techniques to control the processing speed and reduce the contact area between the material and the tool.

2. Drill bit wear problem

The hardness of carbon fiber material is comparable to that of high-speed steel. When using a pistol with a drilling speed of 6000r/min to drill a hole with a depth of 4.85mm, the high-speed steel bit will wear out after drilling 3-4 holes, while the high-hardness alloy bit 50~70 holes can be drilled. Therefore, to solve this problem, high-hardness tools, such as alloy steel, ceramics, and diamond, should be used.

3. Dust problem

Carbon fiber board will generate a lot of dust and debris when drilling. Coolant can be used to remove dust during the drilling process, which can not only reduce the damage of dust and debris to the human body, but also maintain the sanitation of the workplace. Return to Sohu to see more