| 摘要 |
A cutting element including a shank portion and a conical cutting portion. The conical cutting portion has a narrow end and a broad end connected to the shank portion. The conical cutting portion narrow end has an insert receiving recess, and an insert is secured in the insert receiving recess. The insert has an outer layer made of tungsten carbide, and an inner core made of a material with a greater hardness than the outer layer.
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