| 摘要 |
PURPOSE:To cut a spiral tooth in the barrel-shaped work, by performing a circular interpolation motion between an X-axis and a Z-axis driving a work diameter and a gear hob in an axial direction, while numerically controlling each axis so as to perform a linear interpolation motion between a C-axis and a Z- axis rotating the work. CONSTITUTION:A hob table 3 rotates centering on a B-axis and a cutting angle of a hob 4 to a work WK is set thereto. Next, the work WK rotates centering on a C-axis while the hob 4 rotates centering on a C'-axis, and furthermore the hob 4 shifts toward a Z-axis and an X-axis. Movement in the hob 4 at the X- axis takes place at a constant speed in synchronous with rotation in a rotary shaft C of the work WK. A ratio of the Z-axis and the C-axis is of sucklike one that a helical tooth is cut in the work WK and yet preset with a tooth pitch of the hob 4 and a helical degree of the work WK. Therefore, in order to numerically control each axis, a linear interpolation motion takes place between both Z- and C-axes. Likewise, movement in the hob 4 on the X-axis will merely control it so as to do circular motion between the X-axis and the Z-axis. For this reason, all X-, Z- and C-axes are controlled for interpolation at the same time. |
