| 摘要 |
PURPOSE:To enable both preprocessing and gear cutting with only one chucking operation to be performed by providing, in front of a pinion type cutting edge, a round cutting edge having a prescribed outer diameter on the same shaft center as the pinion type cutting edge for gear cutting of a pinion cutter for an NC gear shaper. CONSTITUTION:A pinion cutter 1 and a round cutter 2 mounted on the cutter spindle of an NC gear shaper are both attached to the tip of a cutter spindle 3. A cutting edge 2a is formed on the round cutter 2, enabling any cutting to be performed. Upon processing a rack bar 8 by means of this pinion cutter 1, preprocessing for spirally cutting a C part prior to the gear cutting by said pinion cutter is required. When the rack bar 8 is attached to the NC gear shaper, and operated so as to process the gear, the round cutter 2 cuts a part shown by C prior to the pinion cutter 1, and in succession the pinion cutter 1 performs the gear cutting. Namely, the only-one-time positioning and fixing for a work will do without bringing about any phase shifting between the preprocessing and the gear cutting.
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