1. What are the composite materials?
Composite materials can be divided into
Metal and metal composite materials, non-metal and metal composite materials, non-metal and non-metal composite materials.
According to the structural characteristics, there are the following composite materials:
Fiber composite materials, sandwich composite materials, fine-grain composite materials, hybrid composite materials.
Second, the problems that the machining center should pay attention to when processing composite materials.
1. Carbon fiber composite material has low interlayer strength and is easy to produce delamination under the action of cutting force. Therefore, the axial force should be reduced when drilling or trimming. Drilling requires high speed and small feed. The speed of the machining center is generally 3000~6000/min, and the feed rate is 0.01~0.04mm/r. The drill bit should be three-pointed and two-edged or two-pointed and two-edged. It is better to use a sharp knife. The tip can cut off the carbon fiber layer first, and the two blades repair the hole wall. The diamond-inlaid drill has excellent sharpness and wear resistance. The drilling of composite material and titanium alloy sandwich is a difficult problem.-Generally, solid carbide drills are used to drill according to the cutting parameters of drilling titanium alloys. The titanium alloy side is drilled first until the drill is through, and lubricant is added during drilling. , Relieve burns of composite materials.
2. The cutting effect of special milling cutters for machining of 2, 3 types of new solid carbide composite materials is better. They all have some common characteristics: high rigidity, small helix angle, even 0°, and specially designed herringbone blades can be effective. Reduce the axial cutting force of the machining center and reduce the delamination, the machining efficiency and effect are very good.
3. The composite material chips are powdery, which is harmful to human health. High-power vacuum cleaners should be used to vacuum. Water cooling can also effectively reduce dust pollution.
4. Carbon fiber composite material components are generally large in size, complex in shape and structure, and high in hardness and strength. They are difficult to process materials. During the cutting process, the cutting force is relatively large, and the cutting heat is not easily transmitted. In severe cases, the resin will be burnt or softened, and the tool wear will be serious. Therefore, the tool is the key to carbon fiber processing. The cutting mechanism is closer to grinding than milling. The linear cutting speed of the machining center is usually greater than 500m/min, and the high-speed and small-feed strategy is adopted. Edge trimming tools-generally use solid carbide knurled milling cutters, electroplated diamond grain grinding wheels, diamond-inlaid milling cutters, and copper-based diamond grain saw blades.
Post time: Apr-09-2021