Tanaka Hidetake

The authors have proposed inclined planetary machining for drilling CFRP, which can produce higher-quality holes than conventional drills and helical machining. A portable inclined planetary machining device has been developed. Conventional inclined planetary machining devices were designed to incline the entire tool spindle and required manual adjustment. In this study, the tool tilting mechanism was automated, and a structure was created in which only the tool part could be tilted, thereby reducing vibration. The device design and mechanism were verified in this report.

Carbon fiber-reinforced resin (CFRP) is a difficult-to-cut material and is prone to burrs and surface delamination. We propose inclined planetary machining as a high-quality drilling method for CFRP. Inclined planetary machining is a method of drilling holes by inclining the tool and using precession motion, which is effective in suppressing burrs and surface delamination. It has also been shown that the quality of machined holes can be improved by using a geometric radius end mill. Here, we applied a radius end mill to inclined planetary machining to conduct continuous hole machining experiments in CFRP, and discuss the progress of tool wear and the quality of the machined holes. In addition, the influence of inclined planetary machining conditions on the machined hole quality was determined by analysis of variance.