| 摘要 |
1535562 Making annular blanks from tube stock FORMFLO Ltd 15 June 1977 [15 June 1976] 24819/76 Headings B3A and B3W Annular workpiece 20, Fig. 2, are formed from tube stock 10 by advancing a part-off rolling tool 12, 15 radially of the tube stock to a depth approximately corresponding to the final desired bore diameter or slightly less than the desired diameter but without severing the workpiece from the stock and machining the inside of the partially severed length to the desired bore diameter. In one embodiment, the rolling tool is advanced to such a depth that the subsequent machining severs the length from the tube stock. In another embodiment, a further rolling tool is advanced radially of the stock to fully sever the length from the stock. A back up roll (32), Fig. 8 (not shown), may be used to chamfer the outside diameter of the inner end of the length while partially severing the length. The outside diameter may be machined while machining the inside diameter and the outer end of the length may be chamfered while machining the inside diameter. A machine for preparing annular workpieces comprises a rotatable chuck 11, at least one rotatable part-off rolling rool 12, 15 and a boring tool 25 for machining the inside bore of the length. Cylinders 14, 17 are operable to advance the rolling tools 12, 15 simultaneously until they reach a predetermined depth. A machining head 21 is movable towards the length by an hydraulic cylinder 33 and carries a cutting tool to machine the outside diameter of the length, the boring tool 25 and a chamfering tool 26. |
