| 摘要 |
[Problem] To improve the discharge of chips generated when performing high-feed processing on a thin-walled material such as an impeller using a multi-flute endmill. [Resolution Means] A multi-flute endmill 1 comprising a cutting edge part 3 having multiple cutting edges and flutes 8 formed between adjacent cutting edges in a rotation direction around the tool axis O, wherein a rake face of each cutting edge is formed from a rake face 6a of an end cutting edge 6 from the tool axis O side to the outer peripheral side of a shank 2, an adjacent rake face 5a of a corner R edge 5 that forms a surface different from the rake face 6a of the end cutting edge 6, and an adjacent rake face 4a of a peripheral cutting edge 4 that forms a surface different from the rake face 5a of the corner R edge 5. A gash 7 that forms a space that is continuous with the flute 8 is formed between the rake face 6a of the end cutting edge 6 and a flank 6b of an end cutting edge 6 that is adjacent on a forward side thereof in the rotation direction R, and the rake face 6a of the end cutting edge 6 also serves as one surface that constitutes the gash 7. |
