| 摘要 |
A cylindrical blade body of a hole cutter includes blades and grooves. Each of the blades is disposed alternately with a corresponding one of the grooves. A cutting edge of each blade includes an outer cutting edge, an inner cutting edge, and a stepped cutting edge. The outer cutting edge of each blade has a point located at a radial outer position of the outer cutting edge. The inner cutting edge of each blade has a point located between the inner cutting edge and the stepped cutting edge. The heights of the points of the inner cutting edges are substantially equal for all blades. The heights of the points of the outer cutting edges are different among the blades. This hole cutter makes it possible to reduce anti-cutting resistance and obtain an optimal cutting state.
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