| 摘要 |
PURPOSE:To extend the service life of a cutter and improve the machining efficiency thereof by bending a steel strip within the conic face cutting edges of a milling cutter and making the strip nearing the cutting edges from the external surface thereof in an axial direction when the strip is trimmed to a predetermined width. CONSTITUTION:A milling cutter 1 has a plurality of cutting edges 11 arranged on a conic surface with a face angle (alpha). A milling cutter axis O1 is laid in parallel with the breadthwise direction of a steel strip 2. This strip 2 is bent between 0 deg. and 360 deg. and made to have curvature, thereby enabling the machining point of the steel strip side to be cut within conic surface cutting edges 11, while a distance from the rotary cutter axis O1 is being gradually shortened. Therefore, the steel strip 2 can be bent to an angle of rolling theta near 360 deg. by using a small guide roller 31 and the side machining point of the strip 2 can be processed within the conic surface cutting edges 11, while said point is gradually brought near the rotary cutter axis O1.
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