Drilling is an important process in the post-processing technology of nanofiber filter membrane composite materials, but nanofiber filter membrane composite materials have the characteristics of high hardness, high strength, poor thermal conductivity, anisotropy, and low interlayer strength. Therefore, it is very difficult to process, and some small nanofiber filter membrane manufacturers have a relatively high processing rejection rate.

1. During the entire high-speed drilling process, the drilling force changes regularly with time. After the drill bit starts to drill, the axial force and torque increase from zero. When the main cutting edge of the drill bit participates in cutting, the axial force and torque maintain this stable state before the drill bit has drilled. After the start of the drilling process, the support rigidity of the underlying material to the drill bit is reduced, resulting in a tool letting phenomenon, and the axial force and torque are gradually reduced until the drill bit is completely drilled out, and their values become zero. Experimental observations have found that this rule is the same under various drilling participations.

2. When drilling nanofiber membrane/epoxy composite materials, it is not suitable to use high-speed steel drill bits, but cemented carbide drill bits. The axial force of the use of high-speed steel drills is much greater than that of the use of cemented carbide drills, which is caused by the different geometric angles of the two drills. Even under the same drilling parameters, the degree of wear of the two tools is quite different.

3. Under the condition of constant feed rate, the higher the drill speed, the smaller the drilling axial force. This is because the higher cutting speed generates more cutting heat, which reduces the strength and hardness of the workpiece material; Under the condition of constant speed, the greater the feed, the greater the axial force, and the effect is more significant. This is because as the feed increases, the thickness of the cutting layer increases, so the axial force will increase.

4. When the speed and feed rate remain unchanged, the more holes the drill has drilled, the greater the drilling axial force. And the higher the speed, the faster the tool wear, so that the faster the axial force increases.

5. Under the condition of constant speed and feed rate, the larger the diameter of the drill, the greater the drilling force, because as the diameter of the drill increases, the cutting area of the cutting edge of the drill increases, and the cutting area determines the cutting force. One of the main factors is that an increase in the cutting area will lead to an increase in the cutting force, which is consistent with the change in the axial force of ordinary metal materials.

6. When other parameters remain unchanged, the greater the thickness of the carbon/epoxy composite material, the greater the axial force of drilling. This is because the drilling is carried out in a relatively closed space, it is difficult to discharge dust-like cutting, and the difficulty increases with the increase of the drilling depth, a large amount of cutting is blocked in the depth of the hole, which greatly increases the distance between the drill and the drill. Friction, so the axial force increases and tool wear increases.