GB1357625A - Manufacture of tubular metal articles from planar workpieces - Google Patents

Abstract

1357625 Making clutch driving rings; stamping ZAHNRADFABRIK FRIEDRICHSHAFEN AG 17 Dec 1971 [31 Dec 1970] 58627/71 Headings B3A and B3Q Tubular articles with end teeth are made by a drawing operation performed on a flat ring having radial teeth. As applied to forming a clutch driving ring 7<SP>1</SP>, Fig. 2, having end teeth 23<SP>1</SP>, from a flat ring, Fig. 1 (not shown), the ring 7 is located on a mandrel 6, Fig. 3, having recesses to receive the teeth (23), and is drawn over the mandrel by a die 8. The ends of the ring are then pressed between a lower ejector die 9, Fig. 6, and an upper die ring 25, the inner circumference of which is slotted (18), Fig. 7 (not shown), to receive fingers (20) extending downwardly from the circumference of an ejector 24. The die 25 is located on a carrier 2 by a key 21, the carrier being mounted on a press ram. When the ram is raised pins 16, extended by pneumatic cushions 35, lift a guide 5 for the ejector die 9 to an extent limited by a stop 22, bolts 19 in the guide pressing against a sloping corner 30 on the die 9. As the ram is lowered, the carrier 2 bears against the ejector 24 carrying the ejector's pin 14 away from a cross-member 33. The drawing and end-forming operations follow. As the ram is raised, ejection is effected by the pins 16 and guide 5 acting on the lower die 9 and by relative movement between the ejector 24 and the ram caused by contact between the pin 14 and the cross-member 33.