Patent GB-583226-A (GB)
Title: Improvements in or relating to rolling mills
IPC: B21H1/02
Filed: 1943-12-16
Abstract: 583,226. Rolling discs. BUDD WHEEL CO. Dec. 16, 1943, No. 21120. Convention date, Dec. 21, 1942. [Class 83 (iv)] Relates to disc rolling mills and consists in the provision of control mechanism for causing the rolls to make a predetermined number of traverses across the rotating blank and for reducing the size of the pass on each successive traverse. Blank handling mechanism is provided to remove a finished disc and substitute a now blank. The blank is centred by a pin 41, Fig. 5, on a table. 33 shaped. according to the taper required. Rolls 67 run on roller bearings on stub shafts keyed at 72 against rotation in brackets 71 and flexibly connected to piston-rods 87 by split collars 88. Plates 74 support the ends of the roll shafts. The table carries a bevel gear ring meshing with a pinion on the motor shaft 37. The brackets 71 slide in ways formed by renewable plates 82, 84, Fig. 8; in a vertically movable roll carriage 23 carried by a hydraulic ram 25. A backing plate 195 can be shifted from one side of the slide to the other to vary the extent by which the roll axis is offset from the axis of the table. Lubricant is supplied from a passage 75 to passages 76 leading to the roller bearings 68 and thence by passages 77 to a delivery passage 78. The table is supported on roller bearings 36 to which lubricant is supplied by passages 61, 62 (not shown) and then passes outwards to the gearing and inwards to the upper and lower bearings 45 and to a sump 63 drained by a passage 64 (not shown). Packing 65 prevents lubricant leaking upwards and a splash guard 66 also serves to prevent a blank from being accidentally thrown from the mill. The initial pass is determined by stops 106 on rods 105, splined in bosses in the carriage 23, and threaded at their upper ends to engage nuts in the head 22 carrying bevel wheels 113, Fig. 3, geared at 120 to connecting shaft 115. Mariual adjustment of the first pass is effected by a hand wheel 122 geared to a vertical shaft 123 geared through a shaft 125 to a gear 127 connectable by a clutch 128 to a shaft and gear 131 driving the shaft 116. The clutch 128 is controlled by a lever 138 actuated by a fluid pressure cylinder 143 with a manually-operated valve. In the other position of the clutch, the shaft 129 is clutched to the boss 133 of a lever pivoted to the rod 135 of a cylinder 136 pivoted at 137 and serving to return the stops' 106 to their initial position prior to rolling a fresh blank. The stops are fed down after each roll traverse by a piston-rod 147, Fig. 10, pivoted to a lever 146 having a pawl 145 in engagement with a ratchet-wheel 144 keyed on the shaft 116. After each pass the roll carriage is raised slightly so that the rolls are clear of the blank during their inward movement, but after the finishing pass the carriage is raised to its uppermost position when an adjustable stop 151 raises a rod 152 against a return spring 153 to trip the pawl 145 and permit the resetting of the stops by the cylinder 136. The inward position of the brackets is determined by adjustable stops 94, Fig. 5, and the travel outwards is stopped and reversed by a series of switches acting in succession so that each traverse up to the finishing pass is of greater extent corresponding to the increasing diameter of the blank. A blank manipulating carriage 155 slides in guides 156, Figs. 13 and 14, under control of handles 161, and has an extension 162 with a gapped end to admit the disc 42 and pin 41. Fingers 164 pivoted at 167 and pressed together by a spring 166 are mounted above the extension 162 and the lower finger carries a locating pin 173 engaging a new blank 174 below and a finished disc 175 above. After the finishing pass and during the rise of the carriage 23 pressure is admitted to the cylinder 54, Fig. 5, the piston-rod 55 of which has a screwed connection at 56 with a central bolt 52 in a supporting tube 47 for the disc 42 and pin 41. A flat 57 engaging the guide 58 prevents the tube from turning. The finished disc is thus lifted from the table and is supported by the ends of arms 176, Fig. 13, carried on shafts 177 geared to cross-shafts 178, 186 rocked by levers 179, 187 pivoted to rods 181, 188 passing through lugs 182 on the carriage 23 and operated by nuts 183 to swing the arms 176 into position under the disc at the end of the upstroke of the carriage. On the next downstroke, the lugs act through springs 184 and collars 185 to return the arms clear of the disc. After the disc is supported by the arms, the pin 41 is moved down and the carriage 155 on which a new blank 174 has. been mounted whilst the carriage is in its outer position is moved inwards and the fingers 164 engage the disc supported on the arms 176. The pin 41 is again raised, entering the hole in the blank and engaging the pin 173 to tilt the fingers and the contained disc to the dotted line position, Fig. 14, in which they are held by a spring catch 169. The carriage 155 is returned to its outer position taking with it the disc 175 for manual removal and leaving the new blank 174 supported on the disc 42, which is again lowered, depositing the blank on the table ready for a fresh cycle. The catch 169 is tripped manually at 172 to reset the fingers 164. A hood 191, Fig. 13, exhausts any oil fumes produced during rolling. A hydraulic control system with electrically-operated valves is outlined with reference to Fig. 18 (not shown).