| 摘要 |
The present invention provides a chip breaker for reliably breaking chips produced during a cutting operation by an annular cutter. Disclosed is a chip breaker having a surface ( 26 ) facing the upstream side of the rotational direction of an annular cutter and extending outward relative to the radius of the annular cutter from an edge ( 24 ) adjacent to the outer peripheral surface of the annular cutter. The edge ( 24 ) is inclined from a first end ( 27 ) positioned at a small distance from the outer peripheral surface of the annular cutter toward a second end ( 28 ) positioned closer to the surface of a workpiece than the first end and spaced at a greater distance from the outer peripheral surface of the annular cutter than the first end.
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