| 摘要 |
<p>Methods and apparatus for making rings from tube stock (10) by a part-off rolling tool (12, 15) which is advanced radially into the tube stock (10) to form successive rings (45), e.g. annular blanks for subsequent roll forming into bearing rings. The tube stock (10) is indexed forward after separation of each ring (45). Errors in the length of tube stock indexed forward each time are contained by forming a locating groove (47) on the tube stock (10) by means of a grooverolling tool (40) set at an appropriate axial distance from the part-off rolling tool (12, 15) and moved radially with it. In the next cycle the groove (47) automatically centres the part-off tool (12, 15) as the latter begins its advance into the stock (10), so as to give the correct axial length of the finished ring (45). The part-off tool (12, 15) is stopped before fully penetrating the tube wall, which is then machined. Final separation takes place during this machining or in a subsequent finishing pass by the part-off tool (12, 15).</p> |
