| 摘要 |
Rings are made from tube stock (10) or bar stock by cold rolling successive end portions (78) of the latter between profile rolling elements (42, 44) of a plurality of rollers which also include parting tool elements (40) for making a parting groove, also by cold rolling. The parting groove is formed, by the parting tool elements while the profile rolling operation takes place during the latter part of the parting groove forming operation. With bar stock, a bore is made through the end portion of the stock, e.g. after the parting groove is formed, the latter having a depth just insufficient for final parting-off, which takes place during subsequent machining of the bore of the ring. A locating groove (76, 80) is also formed, by means of a grooving tool (74), simultaneously with the rolling operation. |
