CNC machining centers are generally easy to handle for the processing of aluminum materials.There are no problems in encrypting various precision parts,and the appearance quality is very good.Is the CNC machining center still the same when processing composite materials?Or is there anything to pay attention to?Jiexiang CNC machining center to answer your questions.
We refer to composite materials,composite materials are 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,it is divided into fiber composite material,sandwich composite material,fine particle composite material and hybrid composite material.The characteristics of these materials are different from those of our aluminum.Pay attention to the following points when processing.
1.The carbon fiber composite material has low interlayer strength and is easy to produce delamination under the action of cutting force,so the drilling or trimming should reduce the axial force.Drilling requires high speed and small feed.The machining center speed is generally 3000~6000r/min,and the feed rate is 0.01~0.04mm/r.The drill requires three-point two-blade or two-point two-blade form.Sharp knife The tip can first cut the carbon fiber layer,and the two edges repair the hole wall.The diamond-encrusted bit has sharpness and wear resistance.Drilling of composite materials and titanium alloy sandwich is a difficult problem.Generally,a solid carbide drill is used to drill the cutting parameters of the drilled titanium alloy,drilling from the titanium alloy side until drilling,and adding lubricant during drilling.Relieve composite burns.
2,3 types of new solid carbide composite material processing special milling cutters have better cutting effect,they all have some common features:high rigidity,small helix angle,even 0°,specially designed herringbone blade can be effective Reduce the axial cutting force of the machining center and reduce the delamination,and the processing efficiency and effect are very good.
3,composite materials are powdery,which is harmful to human health.High-power vacuum cleaners should be used for vacuuming.Water cooling can also effectively reduce dust pollution.
4.Carbon fiber composite members are generally large in size,complex in shape and structure,high in hardness and strength,and are difficult to process materials.During the cutting process,the cutting force is large,the cutting heat is not easy to pass out.In severe cases,the resin is burned or the resin is softened,and the tool wear is severe.Therefore,the tool is the key to carbon fiber processing,and the cutting mechanism is closer to grinding than milling.The cutting line speed of the machining center is usually greater than 500m/min,and the high-speed small feed strategy is adopted.The trimming tool generally uses a solid carbide knurling cutter,an electroplated diamond particle grinding wheel,a diamond milling cutter,and a copper-based diamond particle saw blade.
Different composite materials have different characteristics,some are due to the impact on the environment,we need to take certain measures,and some composite materials are processed by changing the use of tools.