| 摘要 |
<p>A tool (10) for trepan machining of a hole in a hard metallic material. The tool (10) comprises: a tubular tool body (12) of generally cylindrical form and having a longitudinal axis and first and seconds ends; a plurality of tool holders (18a-f) located adjacently on the first end of the tool body (12), in a substantially circular pattern about the longitudinal axis, each tool holder (18a-f) having a tool insert receiving pocket (22a-f), with the pockets (22a-f) being alternately positioned at first and second radii about the longitudinal axis; a tooth insert (24a-f) fitted closely into each pocket (22a-f), so as to align the tool inserts (24a-f) to cut overlapping inner and outer portions of an annular leading surface when the tool body (12) is rotated about the longitudinal axis to thereby generate parallel inner and outer cylindrical surfaces as the leading surface is advanced, the tool body (12) further including a spiral chip relief groove (16a-f) adjacent each pocket (22a-f); a screw (26) retaining each cutting tooth insert (24a-f) in its respective pocket (22a-f); each tool holder (18a-f) further including a relieved flank (20a-f) to provide access to the retaining screw (26) in the adjacent tool holder (18a-f); and a drive shank (14) concentric with the longitudinal axis and connected to the tool body (12) at the second end for rotating the cutting tooth inserts (24a-f). <IMAGE></p> |
