Patent GB-707061-A (GB)
Title: Process of and apparatus for making metallic rings
IPC: B21D53/20
Filed: 1951-03-07
Abstract: 707,061. Making rings. HEIDE, H. C. (Edwards, H. E.). March 3, 1952 [March 7, 1951], No. 5549/51. Classes 83 (2) and 83 (4) Shearing; forging.-A method of forming and shearing rings from tubing is characterized in that one end of the tubing which is to form the ring is swaged against an inside forming die and then sheared from the tubing white maintaining-the swaging elements closed around said ring. The bolster plate 11 of a press carries an angular casting 12 apertured to receive a hardened threaded bushing 13 which constitutes the' outside shear member and whose inner face is flush with the vertical face of the casting 12: The bushing 13 receives a tube 15 from which the rings are to be sheared said tube being internally supported by a mandrel 16. The tube is intermittently fed by means of a hook 17 secured to a sprocket chain 18. The mandrel is adjustably secured by a stud 19 having a flanged head which interfits with a fixed bracket. The casting 12 has vertical ribs which guide a vertically reciprocating carrier 20 which is spring-loaded bya spring 23. The carrier 20 has an inside shearing and forming die in the shape of a cylindrical plug 24 whose outer end lies in the shearing plane S determined by the end of the outside shearing die 13, the end of the mandrel and the vertical face of the casting 12. A flanged spring- loaded .stop sleeve 25 surrounds the plug 24 and serves to limit the feed of the tube. The sleeve 25 is connected to a bridge 26 by a pair of struts. 27 and is accurately adjusted by a stopscrew 28. The sleeve also acts as a ring ejector when the carrier.20 is at the bottom of its stroke this being effected by a projecting stud 31 slidably mounted onthe carrier and engaging the bridge 26 said stud, by engaging a wedge 32, moves the sleeve against its spring 30 and ejects the blank. The carrier 20 is recessed to accommodate a pair of spring-loaded swaging plates 35 and 36 pivotally mounted on a pin 34 on the carrier. A slight clearance is provided in the mounting of the swaging plates 35 and 36 upon their pivot- 34 to compensate for any eccentricity between the inner and outer walls of the tube. The plates-have semi-circular swaging faces which compress and conform the end of the tubing 15 accurately to the plug 24. The plates are rigidly supported in the shearing plane S by an adjustable wear plate 38 and the plates are tapered at their upper ends to enable the swaging movement to be effected by a V-shaped cam 40 secured in the cross head 41 of the press. The cam 40 also-depresses the carrier after the swaging plates have been closed and effects the shearing operation. The initial position of the carrier is adjusted by means of a stop screw 44. When the end. of the tubing is held securely in the swaged condition by the swaging plates the cross head of the press depresses the carrier causing' the ring to be sheared and as soon as the ring is brought into line with a recess 45 in the casting: 12 and the stud 31 advances the stop sleeve 25 stripping the ring from the plug 24 and permitting it to drop out of the press. The rings after annealing may be applied as bands on projectiles without being subjected to any further mechanical treatment.