| 摘要 |
PURPOSE:To prevent the fall in accuracy of processing and the damage to a hob from being caused due to a phase discrepancy, by turning a helical gear depending on its lead and the quantity of movement of the hob in the direction of the axis of gyration of the gear to make the hob and the gear coincident with each other in phase. CONSTITUTION:The relation between the quantity Z of movement of a hob in the axial direction of a helical gear 11 and the rotation angle C of a table is previously determined in the form of C=(360/Q).Z.(1/ta) for each workpiece 11, where Q denotes the number of teeth of the workpiece and ta denotes the axial pitch of the hob, to immediately calculate the rotation angle C in terms of the quantity Z when the hob is moved in the axial direction of each workpiece. The determined relation is previously entered as phase adjustment information Gdd into a numerical controller. The information Gdd is used in processing the helical gear 11, to automatically turn the shaft of the table by the angle C calculated from the number Q of teeth of the workpiece 11, the axial pitch ta and the quantity Z of axial movement of the hob to make the hob and the helical gear coincide with each other in phase. A phase discrepancy is thus eliminated to prevent the fall in accuracy of processing and the damage to the hob. |
