Abstract
In this paper, a duplex spread-blade method for cutting hypoid gears with modified tooth surfaces is proposed. The duplex spread-blade method is a rapid and economical gear manufacturing method because both the ring gear and pinion are cut by a widely spread-blade cutter, that is, both sides of a tooth space are finished simultaneously by a cutter. In the proposed method, the nongenerated ring gear is cut by a cutter in which each cutting edge is altered from the usual straight line to a circular arc with a large radius of curvature and the pinion is generated by a cutter with straight cutting edges. The circular arc cutting edges enable application of the duplex spread-blade method theoretically and produce a tooth surface modification. The main procedure of this method is the determination of cutter specifications and machine settings which satisfy the duplex spread-blade conditions taking account of the position of tooth bearing. The validity of the proposed method was confirmed by the actual gear cutting.
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