The Airbus A380 super-large aircraft, which can carry 555 passengers, is being tested, and its first aircraft will be delivered to Singapore for commercial operation by the end of this year. To reduce the weight of the aircraft, 22% of the structural weight of the new A380 is made of advanced carbon fiber reinforced plastic (CFRP). In the assembly phase of the aircraft, it is necessary to drill the overlapping holes of the CFRP and the aluminum and titanium members. The upper deck's slab (made of CFRP) must be connected to the aluminum member supporting it. If the general drill is used, only 90 can be drilled. Holes. To this end, Swiss Extramet Carbide Corporation, Klenk Tools of Germany and CemeCon Coatings have jointly developed a drill bit specifically for processing CFRP coated with CCCDia Fiberspeed diamond coating. In the first trial drill, the life of the drill bit reached 500 holes, the wear of the peripheral part of the drill bit was significantly reduced, and the surface quality and precision of the hole (H8) was improved, and good economic benefits were obtained.
When this diamond coated drill bit was used for the processing of the φ10mm rivet hole of the A400M military transporter, the same effect was obtained. The A400M's wing skin and support spokes are made of CFRP. The skin is riveted to the spokes. The rivet holes are drilled on both materials, requiring no delamination during drilling and achieving H8 accuracy. Only a multi-layer diamond coating can withstand the intense abrasive wear of the CFRP on the tool. In addition, the chemical stability of the diamond coating also avoids bonding of the workpiece material.
When this diamond coated drill bit was used for the processing of the φ10mm rivet hole of the A400M military transporter, the same effect was obtained. The A400M's wing skin and support spokes are made of CFRP. The skin is riveted to the spokes. The rivet holes are drilled on both materials, requiring no delamination during drilling and achieving H8 accuracy. Only a multi-layer diamond coating can withstand the intense abrasive wear of the CFRP on the tool. In addition, the chemical stability of the diamond coating also avoids bonding of the workpiece material.
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