Development of Ball End Milling for Fine Finish, High-efficiency.

High-efficiency die-sinking of a plane surface using a ball end mill has been developed to obtain high-quality dies with a finely-milled surface. Noticing the effectiveness of the high-feed cutting method equalizing the tool feed per tooth to the pick feed, investigated were the shapes of cutting tools appropriate for the method. To solve the problem of the milled-surface roughness resulted from machining marks and peeling off built-up edge by using conventional cutting tools, a new tool with superior cutting quality and excellent durability has been developed by eliminating the central end cutting edge. The developed end milling and cutting tool ensure the machining of resin-mold die steel at the feed rate of 4 m/min to make the surface roughness under 4 μm.