| 摘要 |
PURPOSE:To simultaneously superfinish both flanks of a Gothic arc groove by a fixed margin by swinging a grindstone about a swing shaft, tilted by a predetermined swing shaft angle for the axial direction of the Gothic arc groove, and assuming its shape in a section at a right angle with the swing shaft for a single circular arc by a minimum error. CONSTITUTION:Along the lengthwise direction (or lead direction) of a Gothic arc groove 7 for such as a nut 6 of a ball screw, external thread, direct acting guide bearing or a ball bearing and the like, a grindstone 10, while it is moved to press the Gothic arc groove 7, is swung around a swing shaft y'' tilted by a predetermined swing shaft angle gamma with respect to the lengthwise direction of the grindstone 10. In this case swing shaft angle gamma is an angle in which a Gothic arc groove shape in a section at a right angle with the swing shaft y'' is considered to be a single circular arc by a minimum error. Both flanks of the Gothic arc groove 7 can thus be superfinished by a uniform margin by swiveling the grindstone 10. |
