Patent GB-1179952-A (GB)
Title: Profiling of Annular Workpieces.
IPC: B21H1/12
Filed: 1967-01-04
Abstract: 1,179,952. Rolling annular workpieces. ROTARY PROFILES ANSTALT. 4 Jan., 1967 [4 Jan., 1966; 14 Jan., 1966 (2); 27 Jan., 1966; 12 April, 1966], No. 580/67. Heading B3M. Apparatus for profiling an annular workpiece 12 comprises two juxtaposed rollers 10, 11 and a mandrel 13 whose ends are in rolling contact with one of the rollers 11 and in which an annular recess 18 is provided which cooperates with the roller 10 to confine a segment of the workpiece to impress the desired profile on its surfaces. The workpiece is restrained from axial spread by the side walls 19, 20 of the recess. The profiling recess may be provided in the roller 10 and the mandrel shaped to co-operate with the recess. In one embodiment, Fig. 3 (not shown), the ends of the mandrel roll on two back-up rolls (11), (17). A control ring may be applied around the workpiece and the profiling space may have an escape gap for the excess metal during the rolling. In an alternative embodiment, Fig. 12 (not shown), the axial spread of the workpiece is restrained by a pair of rollers (46), (47) which may be separately mounted or be two halves of a divided roller. In this embodiment, however, the rollers rub against the workpiece and it is preferable to use conical shaped rolls 49, 50, Fig. 13. The rollers 49, 50 have their sides arranged so that the mandrel 13 can run on them. The conical end of the rollers 49, 50 may be made in two parts, Fig. 14 (not shown), with a thrust bearing (55) between the parts. In one of the embodiments, Fig. 41, the workpiece 142 with a mandrel 143 is enclosed by a control ring 147 which has rollers 144 permanently mounted therein so that the workpiece can be withdrawn, leaving the rollers in place. In a modification, Fig. 43 (not shown), the rollers are withdrawn from the C-shaped control ring 147 with the workpiece and fall away from the workpiece after withdrawal. In a further embodiment of the machine, Fig. 18, one roll 11 is mounted within a second hollow roll 10 and the workpiece 12 is successively profiled between preferably three mandrels 72, 74 as they pass through the profiling space. The mandrel 74 may not profile the workpiece but be formed with a cutting edge (75), Fig. 20 (not shown), which cooperates with the edge (76) of the outer roll to remove the flash (26). The diametric spread of the workpiece may be restricted by a control ring. In another embodiment, Fig. 40, the mandrel includes several profiling surfaces 136 so that workpieces can be worked simultaneously. The mandrel may be integral or composed of several units with stub axles 137. One embodiment of the machine, Fig. 22, for high rate of throughput comprises an inner roll 11 surrounded by a C-shaped outer member 79. The member 79 may be made from separate arcuate parts joined together. The workpieces 12 are threaded on to the mandrels 13, fed down a shoot 82 to the wide end of the throat and progressed along the C-shaped throat which gradually narrows to profile the workpiece between the mandrel and the member 79. The mandrel rolls on the member 79 during its passage through the throat. Each mandrel may have several profiling recesses. In a further embodiment of this machine the threaded mandrels are fed from opposite directions to symmetric throats arranged between two members (84); (85), Fig. 25 (not shown), and a roll 86. The roll 11 may have a series of rolls 93, Fig. 27a, mounted thereon and the work. piece is profiled between the C-shaped member and the mandrel 94 which rolls against a pair of the rolls 93. In a further embodiment, rolls 101, Fig. 32, are mounted on a chain and the workpiece is profiled between the roller 11 and the mandrel which rolls on an adjacent pair of rolls 101. The profiling may be performed on the external surface of the C-shaped member (107), Fig. 33 (not shown), and the rolls (109) housed in an annular member (108).