Patent GB-805182-A (GB)
Title: A spinning machine
IPC: B21D22/16
Filed: 1956-12-11
Abstract: 805,182. Spinning. CINCINNATI MILLING MACHINE CO. Dec. 11, 1956 [Dec. 20, 1955], No. 37795/56. Class 83 (4). [Also in Group XXIX] A spinning machine having a work-forming mandrel 13, a bed 10, a headstock 11 and tailstock 12 supporting the mandrel, and tooling units 15 and 16, each comprising a main slide 60 mounted on the bed, a superposed cross-slide 69, a spinning tool 17 rotatably and adjustably mounted on the cross - slide, separate power - operated means for moving said slides, and a first manual control for energizing the power operable means for the crossslide to advance the tool into engagement with the work, includes control means automatically operable by the cross-slide at the end of its advance to effect traverse of the main slide by its power-operable means, and additional control means automatically operable by the main slide to stop its movement and effect retraction of the cross-slide. The headstock is fixed to the bed 10 and is mounted in bearings comprising a double conical anti-friction bearing 30 at the mandrel supporting end, an anti-friction bearing 31 at the other end and an intermediate thrust bearing 32. An electric motor 38 drives the headstock through a gear-box 35. The tailstock 12 mounted in bearings 50, 51 and supported on guides 44 is reciprocable by a hydraulic piston 45. The tailstock chuck 52 comprises three adjustable jaws 53 (Fig. 8), which clamp a conical spider 55. Each tooling unit has a bed-plate 27 bolted to the machine bed 10 and adjustable thereon by means of a screw 19 rotatable by a handle 23. The bedplate has guide surfaces 57, 58 and 59 (Fig. 4), for accommodating the main slide 60 reciprocable by a hydraulic piston 65 in a cylinder 66. The main slide carries the cross-slide 69 reciprocable on guide surfaces 70 by a piston 73 in a cylinder 74 mounted on the main slide. Angular adjustment of the tool head 77 on the cross-slide is effected by a rack-and-pinion 81. The spinning roller 17 is mounted in tapered roller bearings in the tool head the roller being interchangeable. The hydraulic power operation of the machine may be manually or automatically controlled by means of a switch operating an electrical control circuits which controls various actuating solenoids for the hydraulic cylinders previously described. Switches are provided for individual or simultaneous operation of the tool slides. In order to equalize the load on the spinning tools the main slides are maintained in step by equalizing the back pressure in each of the main slideoperating cylinders 66, 66<SP>1</SP> throughout the stroke by hydraulic balancing valves 200 and 201. During the working stroke of the main slide the return channel 202 from cylinder 66 is connected to ports 204 of a reversing valve 183. This port 204 is connected to a rapid traverse control valve 207 and the return fluid is directed through a channel 213 to the throttled port 214 of balancing valve 200. The fluid in channel 213 is also directed through a channel 220 and choke coil 221 to the other side of the spring- loaded plunger 223 in balancing valve 200. Similarly the fluid returning from cylinder 66<SP>1</SP> passes through a reversing valve 189 and thence to a rapid traverse control valve 232 and to the throttle port 235 of the other balancing valve 201. The balancing valves are cross-connected to balance the back pressure in one cylinder against the back pressure in the other cylinder. Rapid traverse valves 210, 233 are provided to effect fast movement of the main slides for set-up purposes. Two pumps 150 and 166, the pump 150 having the greater capacity, supply the pressure fluid. In operation, the blank is loaded between the rollers and the end of the mandrel and the cross slides are advanced to a predetermined position which controls the wall thickness of the finished product said position being set by a stop on the cross slide which abuts a bracket on the main slide. An interlock is provided between the tailstock and the cross-slides to ensure that the tools are not moved into engagement with the work until it is clamped by the tailstock. The cross-slides at the end of their advance operate limit switches to operate the main slides and with the headstock and workpiece rotating the spinning commences. At the end of their stroke the main slides operate switches which energize solenoids to cause return movement of the cross-slides and retraction of the tailstock to enable the finished product to be removed. Finally the main slides are retracted and the machine is ready for the next workpiece.