高速ミーリング用ボールエンドミルの創成とその切削特性−ソリッドボールエンドミルの刃先ランド処理による工具寿命向上と加工安定化−

Abstract

High speed milling has been realized owing to a number of component technologies. The advancement of these technologies plays a pivotal role in practical application of high speed milling. Cutting tool is one of the most important component technologies among them. Especially, ball end mills, which are the central tools for die and mould machining, have wide usage. Therefore, ball end mills with long tool life and high machining performance are strongly demanded. However, the relationship between tool shapes of ball end mill and high speed milling has not been made clear since it is hard to analyze some complex tool shape parameters. The study focuses on the cutting edge shapes of ball end mills, and allows the creation of micro-lands on rake face and flank face in order to make tool lives longer and keep machining more stable. They are named Neg-land (land between cutting edge and rake face) and Pos-land (land between cutting edge and flank face). High speed cutting experiments enable us to recognize some specific cutting characteristics of created ball end mills. Based on the obtained characteristics, ball end mills with an original cutting edge shape (Opt-tool) are again proposed and produced. As a result, it is experimentally found that the Opt-tool shows the longest tool life and the highest machining performance in high speed milling.