GB1071131A - Construction and control of planetary mills - Google Patents

Abstract

1,071,131. Planetary rolling mills. T. SENDZIMIR. June 16, 1964, No. 24874/64. Heading B3M. A planetary rolling mill comprises a housing (1, 18-21) which may be a single casting, backing rolls 2, Fig. 1, working rolls 4, 5 carried by the backing rolls, and a work pusher 8 actuated by a fluid-pressure cylinder 10 for feeding the work 6. Rolls 2, 3 are eccentrically supported in arcuate chocks 12, 13, and the pass is adjusted by means of fluid-pressure cylinders 15, 17 which oscillate the chocks. In a modification, the work (6) is fed by feed rolls (22), (23) eccentrically mounted in arcuate chocks (24), (25), Fig. 2 (not shown), and driven pinch rolls (28), (29), and (34), (35), are provided. The pass between the pinch rolls is adjustable by means of screws, or fluid-pressure means (32), (38), and hydraulic cylinders (33), (39). In a further modification, feed rolls (22), (23), the planetary rolls, and pinch rolls or planishing rolls (40), (41), are all eccentrically mounted in chocks carried by the same housing (1), Figs. 3, 4, 5 (not shown). Each of the backing rolls 112, 113, Figs. 3, 4, 9 (not shown), carries a rotatable sleeve (114) or (115), and working roll-retaining rings (116), (117), or (118), (119) are fixed to their respective backing rolls (112), (113). Arcuate shoe members (120), (121) urge some of the working rolls on the opposite side to the pass, against the sleeves, to thus drive the sleeves, by bell-crank levers (124), (125), (126), or (127), Fig. 4 (not shown), which are actuated by fluid-pressure cylinders (130). The actual position of a backing roll (112), Fig. 9 (not shown), can be adjusted by screwing a member (158) relative to the housing by gears (161), (160). Roll (112) has helical splines (112a), (112b) thereon which co-operate with corresponding splines provided in the cages (116), (117) so that as roll (112) is adjusted axially, the cages are rotated slightly so as to influence the parallelism of the working rolls (5). Backing rolls (112), (113), Fig. 6 (not shown), are driven from a pinion stand by a motor which is connected to the end (154) of a shaft (150), helical pinions (152), (153) being provided, the pinion (152) being slidably carried on a shaft (149) and engaged by an adjustable screw (155). Adjustment of screw (155) will vary the relative rotative positions of backing rolls (112), (113), to thus vary the positions of the working rolls. In a further modification, backing rolls (2), (3), Fig. 7 (not shown), carry planetary assemblies (4), (5), and the ends of the working rolls are mounted in chocks in rings (57-60). These rings have gear teeth thereon which are provided to maintain parallelism of the working rolls with the backing rolls. The rings are all connected by bevel gears (70-77) and shafts (61), (67), (78), (79). Shafts (78), (79) may be divided, each part of which, e.g. (79), (79a) is connected by helical splines (80), (81), and a sleeve (82). A screwed sleeve (83) or (83a) has a gear-wheel (86) which co-operates with a rack (88) actuated by a handle (91) so that as the rack is moved, sleeve (83) is rotated, and due to the helical splines (80), (81), shafts (79), (61), (79a), (67) will be rotated, and the position of the ends of the working rolls will be adjusted. The relative adjustment of the rings at each end of each backing roll can also be adjusted to vary the roll parallelism, by screwed sleeves (92), (93), which move helical gears (63), (69) along their respective shafts (61), (67). In a still further modification, the cages (98), (99) of a backing roll, Fig. 10 (not shown), are connected to different variable speed motors (102), (103) through gear reduction units (104), (105), and flywheels (106), (107). A selsyn generator 108 is connected to a selsyn motor (109), and a differential (110) is provided which carries a pointer on a free member (111). When the pinions (100), (101) rotate at different speeds, the difference is indicated on the pointer, which may be caused to generate a signal to vary the speed of motor (104). The hydraulic system for operating the chocks comprises an electrohydraulic servo valve (46) connected to cylinder (15) above and below its piston (47). Figs. 8, 8a (not shown).