| 摘要 |
PURPOSE:To perform burnishing work following shaving work with no necessity for rearrangements, by providing a burnishing work part, having no serration, successively to a serration part which performs the shaving work along the tooth trace direction of each tooth in a cutter. CONSTITUTION:A shaving cutter 21, engaging its serration part 22a with a gear to be cut with a crossing angle being given, performs shaving work of the gear to be cut by forcedly rotating either one of the cutter or the gear to be driven. Next the cutter 21, relatively moving the gear to be cut in a tooth trace direction and changing an engaging position, engages a burnishing work part 22b with the gear to be cut. And the cutter, similarly forcedly rotating the gear to be driven, performs burnishing work of the gear after its shaving work by the burnishing work part 22b. Here the shaving work causes a sharpened portion to be left in a tooth surface of the gear to be cut 23 in the crossing part of a cutting locus of a serration cutting edge, but the cutter, burnishing the sharpened portion by the burnishing work part 22b, improves both tooth surface roughness and also tooth surface strength. |
