Abstract
In machining, the twist drill is one of the most common tools. But, the conventional twist drilling often lead to distorted holes that have triangle-shape or pentagon-shape because of "Walking phenomenon" and "Chatter vibration." Therefore the roundness becomes worse. In order to improve roundness, the drill with two asymmetric cutting edges has been developed. In previous researches, it is known that the roundness is improved by using the asymmetric cutting edge drill regardless of drill diameter. Especially, in the case of the drill has low rigidity, the improvement of roundness is large. In this study, we have investigated straightness and surface roughness of inner wall of holes empirically. As a result, even the drilling depth was deeper than previous researches, the roundness of drilled hole was smaller than that of conventional drilling and also the straightness was improved by using the asymmetric cutting edge drill.
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