| 摘要 |
A section is cut off a tube, and the exterior and interior faces of the section are formed into a spherical shape. Ball bearing (8) retaining slots (11) are cut out of the section, before the ball bearing cage (10) is heat treated. A finishing machining is carried out on the interior and exterior faces of the sphere. The slots are cut out by means of a high energy density electron beam. For cutting out the slots, the machine uses a transversal displaceable table (22) fitted with a rotatable horizontal spindle (25) for supporting the cage and also a vertically displaceable high density electron beam slot cutting tool (27) arranged above the spindle (25). |
