| 摘要 |
1280166 Gear cutting GLEASON WORKS 1 Oct 1969 [21 Oct 1968] 48243/69 Heading B3K In a method of cutting bevel gears having tapering tooth slots e.g. hypoid or spiral bevel gears, a preliminary roughing operation is carried out at a first roughing station comprising a plunge feed of the tool at the heel of the workpiece to partial depth followed by an abbreviated generating roll followed by a return non-cutting roll accompanied by indexing of the workpiece. In a second roughing stage cutting is carried out in both directions of roll the ratio of roll being modified in one direction by mechanism which is arranged to move the tool cradle drive worm axially. Mechanisms are also described for imparting axial, rotational and hypoid offset (i.e. laterally directed) set-overs to the tool cradle at the end of a generating roll in the second roughing stage. A suitable machine tool for carrying out the method comprises two double machines 20, 22, having two roughing stations 24a, 24b and two finishing stations 24c, 24d with work handling turrets 46, 46b and conveyers 44a, 44b providing for continuous feed of the workpieces in a continuous automatic production line. The machine tools are generally similar to those described in Specification 1,280,162, the generating train and controls as in Specifications 1,280,163 and 1,280,167, and the mechanisms for providing ratio change and cradle set-overs as in Specification 1,280,164. |
