MULTI-FLUTE ENDMILL

摘要

Multi-flute endmill having a cutting edge rake face formed from a side of a rotation axis to a peripheral side in a radial direction, and having an end cutting edge rake face. A peripheral cutting edge rake face adjacent to the end cutting edge rake face forms a face different from the end cutting edge rake face and serves as the rake face of a corner edge. An intersection between a convex ridge line is located in a boundary between the rake faces of the end cutting edge and peripheral cutting edge. A convex ridge line is located in a boundary between the end cutting edge rake face and a bottom surface of the flute is moved into the side of the rotation axis in the radial direction with respect to a boundary between the flank face of a corner edge and the flank face of the end cutting edge.

主权项

1. A multi-flute endmill comprising:
a cutting edge part that has a plurality of cutting edges, each formed with an end cutting edge which is formed at a tip of a shank from a side of a rotation axis O to a peripheral side in a radial direction of the shank, a corner R edge continuous to the end cutting edge and a peripheral cutting edge continuous to the corner R edge; and
a gash and a flute that are respectively formed on a center side and the peripheral side in the radial direction between the adjacent cutting edges in a rotation direction R around the rotation axis O, wherein a rake face of the cutting edge is formed, from the center side to the peripheral side in the radial direction, with:
a rake face of the end cutting edge; anda rake face of the peripheral cutting edge that is adjacent to the rake face of the end cutting edge, that forms a face different from the rake face of the end cutting edge and that also serves as a rake face of the corner R edge, a flank face of the cutting edge is formed, from the center side to the peripheral side in the radial direction, with:
a flank face of the end cutting edge;a flank face of the corner R edge adjacent to the flank face of the bottom end cutting edge; anda flank face of the peripheral cutting edge adjacent to the flank face of the corner R edge, the flute is formed with:
the rake face of the peripheral cutting edge;a flute face opposite the rake face of the peripheral cutting edge on a forward side in the rotation direction R; anda bottom surface formed in a boundary between the rake face of the peripheral cutting edge and the flute face; and an intersection between a convex ridge line located in a boundary between the rake face of the end cutting edge and the rake face of the peripheral cutting edge and a convex ridge line located in a boundary between the rake face of the end cutting edge and a bottom surface of the flute is moved into the center side of the radial direction than a boundary between a flank face of the corner R edge and a flank face of the end cutting edge.