Patent GB-635146-A (GB)
Title: Method and apparatus for roller spinning articles from ductile material
IPC: B21D53/26
Filed: 1947-06-20
Abstract: 635,146. Making pulleys. SPUN STEEL CORPORATION. June 20, 1947, No. 16398. Convention date, June 21, 1946. [Classes 83 (ii) and 83 (iv)] Spinning.-In spinning a V- groove in a sheet-metal pulley or the like, the spinning pressure is applied by a roller moved angularly to the spin axis, and an axial thrust applied to the blank increases to a maximum during the operation. The roller is free to move parallel to the spin axis to equalize the pressure on both,faces of a supporting V-die. A partformed blank E is located by a spigot 60 in a supporting die 61 mounted on an idle, vertical shaft 59 on bearings 56 slidable in a cylindrical tailstock 54. Three tailstocks 54 are mounted equilaterally about a pivot 49 on a turret plate 52 having a crown ring 51 rotated by an oil motor. Fig. 3 not shown, cam controlled to index the tailstocks successively through 120 degrees. The spinning heads 15, 16 comprise an upper, half-reed die-part 18 on a vertical shaft 13 and having a co-operating clamp block 22 resiliently mounted to slide co-axially with the shaft 13, and positively driven by the part 18 through pins 31. Two heads are used in succession for roughing and finishing, and the parts 18 may be of different form. The spinning V-rolls 43 are ball-bearing mounted between sprung arms 48 permitting vertical movement relative to bell-crank supports 37 operated by fluid pistons 33 to move the rolls 43 radially relative to the spin axis. The spinning heads 15, 16 are driven by a common belt 11 from a parallel motor shaft 9. The bearing supports 62 of the tailstocks 54 are T-slotted for engagement when indexed beneath the heads 15, 16, by shafts 75, 76 operated by hydraulic pistons 70, 73 and air piston 71 to raise the dies 61 and blanks against the heads 15, 16. The tailstock and roller operating valves and a turret index lock are solenoid controlled and limit switches are fitted to the roller feed and tailstock pistons 33, 70 and the turret lock. Fig. 19. Indexing, tailstock and roll feed control cams 151, 152, 153 are synchronously driven by a timer 149 and with lock operating switch 154 open, cam 152 closes switch A and a circuit through the turret limit switch 142 operates the " up " solenoid 195 of the tailstock valve 157. Gam 153 closes switch B and a circuit through the tailstock " up limit switches 146 operates the " in " solenoid 202 of the roll feed valve 158. After a preset spin time, switch B is opened by cam 153 which closes switch C and energizes an " out " solenoid 165 of the roll feed valve 158 to retract the rolls. Cam 152 opens switch A and closes D in circuit with the roll out limit switches 143 to operate the tailstock " down " solenoid 178. Finally with the down limit switches 147 closed cam 151 operates switch 154, energizing the lock operating solenoid 115, and continuous oil feed to the turret motor 92 indexes the heads, a cam 101 providing automatic deceleration until the lock arm 108 re-engages and the limit switch 142 is closed for the cycle to repeat. A blank is placed in the front tailstock die 61 and the timer indexes the turret 52 through 120 degrees and relocks it. With the limit switch 142 closed the die 61 rises to engage the head 16 and rotate the blank. The spinning roller 43 feeds in to rough form the V-groove, and air pressure on the piston 71 raises the tailstock to take up the decrease in length and increase the axial pressure, the roller 43 lifting vertically to maintain the V-flank pressures equal. The roller 43 is withdrawn, and the tailstock lowered. The timer then indexes the turret beneath the finishing head 15 and carries a new blank to position beneath the head 16 and the process is repeated, a dwell being provided for an ironing operation. A third blank is meanwhile inserted in the vacant tailstock and the third indexing brings the completed pulley to the front for removal.