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Problems that should be noticed when CNC machine center processes composite materials

Dec 12, 2019

cnc machine center

CNC machine center is a high-precision machining equipment with strong automatic processing. The entire machining process is completed under the control of CNC system. It can process some very unique composite materials. Nowadays composite materials are widely used in us Every aspect of life, especially the aerospace industry, some super-precision machinery industries. The following briefly introduces some issues that CNC machine center should pay attention to when processing composite materials:

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1. Carbon fiber composite materials have low interlayer strength and are prone to delamination under the action of cutting forces, so the axial force should be reduced during drilling or cutting. Drilling requires high speed and small feed. The speed of CNC machine center is generally 3000 ~ 6000r / min, and the feed rate is 0.01 ~ 0.04mm / r. The tip can cut the carbon fiber layer first, the two edges play a role in repairing the hole wall, and the diamond-set drill has good sharpness and wear resistance. The drilling of interlayers of composite materials and titanium alloys is a difficult problem. Generally, solid carbide drills are used to drill according to the cutting parameters of the titanium alloy. Drilling from the titanium alloy side until drilling through, adding lubricant during drilling Relieves burns of composite materials. Boeing has specially developed a PCD combination drill for drilling of interlayers.

 

2. The cutting effect of the new type 2 and 3 solid carbide composite special milling cutters is better. They all have some common characteristics: high rigidity, small helix angle, and even 0 °. Specially designed herringbone blades can be effective. Reducing the axial cutting force of the machining center and reducing the stratification have good machining efficiency and effect.

 

3. The chip of the composite material is powdery, which is harmful to human health. A high-power vacuum cleaner should be used for vacuuming. Water cooling can also effectively reduce dust pollution.

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4. Carbon fiber composite materials are generally large in size, complex in shape and structure, high in hardness and strength, and are difficult to process. During the cutting process, the cutting force is large, the cutting heat is not easy to be transmitted, and the resin is burnt or softened when it is severe, and the tool is severely worn. Therefore, the tool is the key to carbon fiber processing. Its cutting mechanism is closer to grinding than milling, so , CNC machine center cutting line speed is usually greater than 500m / min, using high speed and small feed strategy. Cutting edge processing tools generally use solid carbide knurled milling cutters, electroplated diamond grain grinding wheels, diamond-inserted milling cutters, and copper-based diamond grain saw blades.


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