| 摘要 |
A cutting insert of a hard material comprising a generally conical tip portion which includes a tip and a base; a first tapered conical portion having first and second ends, with the first end adjacent the base of the tip portion and the second end having a greater diameter than that of the first end; a transition portion having first and second ends and defining a radius of curvature therebetween, with the first end adjacent the second end of the first tapered conical portion, a second tapered conical portion having first and second ends with the first end adjacent the second end of the transition portion and the second end having a greater diameter than the first end; a shoulder portion having first and second ends with the first end adjacent the second end of the second tapered conical portion and having a greater diameter thereto. Also, an extracting tool comprising an elongated tool body having an end which is configured and dimensioned to provide a support surface for a cutting insert as described above. |
