S1320205 超音波スピンドル援用によるCFRPの穴あけ加工に関する研究([S132-02]先進切削加工技術(2))

Abstract

CFRP (Carbon fiber Reinforced Plastics) is recently used as structure components in the aviation and automobile industry due to its excellent properties, such as specific strength, stiffness and so on. A great number of rivet holes are necessarily drilled out in the airplane manufacturing. CFRP is, however, difficult-to-cut material because that hard carbon fibers cause to rapid tool wear. Ultrasonic vibration cutting is cutting method that tool will be vibrated ultrasonically and used to cutting. Major merit is reducing the thrust force and tool lifetime elongation. In this study, aims to investigate about the effects of ultrasonic vibration assisted drilling on CFRP plates with ball-nose end mill. 40 kHz ultrasonic spindle is attached on the conventional 3-axis machining center. Cutting conditions of cutting speed and feed rate are optimized value by previous research which was experimented without vibration conventional drilling, and the experiment was performed and investigated. As the result, width of tool flank wear is reduced 20%. On the ultrasonic vibration drilling, hole diameter reduction becomes small because tool vibrated to radial direction. After tool head passed bottom surface, tool vibration becomes large. Thrust force vibrated large and becomes minas values. The minus thrust force becomes cause to reducing delamination of exit side, and increasing entry side delamination.