Invention Grant
- Patent Title: Rotary cutting tool with unequal indexing, alternating helix angle and varying helix angle along length of cut
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Application No.: US14683692Application Date: 2015-04-10
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Publication No.: US09862038B2Publication Date: 2018-01-09
- Inventor: Danny Ray Davis , Frederick John Palmer
- Applicant: Kennametal Inc.
- Applicant Address: US PA Latrobe
- Assignee: KENNAMETAL INC.
- Current Assignee: KENNAMETAL INC.
- Current Assignee Address: US PA Latrobe
- Agent Matthew S. Bedsole
- Main IPC: B23C5/10
- IPC: B23C5/10

Abstract:
A rotary cutting tool with a longitudinal axis includes a shank portion and a cutting portion defining a length of cut. The cutting portion includes a plurality of blades separated by flutes extending along the length of cut. A first blade forms a first helix angle with respect to the longitudinal axis at the cutting tip. A second blade adjacent the first blade forms a second, different helix angle with respect to the longitudinal axis at the cutting tip. The cutting edge of the first blade is formed at a first distance with respect to the cutting edge of the second blade. A helix angle of at least one of the plurality of blades varies along the length of cut and a distance between cutting edges of the first and second blades varies along the length of cut.
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