Patent GB-386461-A (GB)
Title: Improvements relating to presses for forming substantially cup shaped articles
IPC: B21D22/06
Filed: 1932-02-18
Abstract: 386,461. Pressing cup-shaped articles. GLASNER, R. W. and RODE, F. J., 6500, West 65th Street, Chicago, U.S.A. Feb. 18, 1932, No. 4789. [Classes 83 (ii) and 83 (iv).] Cupping; brakes.-A press for forming cupshaped articles comprises a number of pairs of dies, arranged so that the inner portion of the blank, Fig. 3, is first formed and is subsequently held stationary while outer dies co-operate to form the other portion of the blank against the resistance of an adjustable fluid pressure cushion. In a single-acting press the ram 14 is connected by a link 13 to a crankshaft 12 and is reciprocated along vertical columns 11. The lower platen 18 supported on the frame 10 is gapped to receive a cushioned member 17 supported on the piston-rods 16 of fluid-pressure cylinders 15 supplied from a main 21 and a valve 22, the latter being operated from the crank shaft 12 through chain and bevel gearing, Fig. 1, and cam member 23. The cushioned member 17 is normally maintained on a level with the base of the platen 18 as shown in Fig. 1. The platen carries a die 33 co-operating with a surrounding support 34 on which the blank 44 rests at the beginning of the operation. The work support is held up by pins 35 resting on the cushion member 17. A housing 36 is mounted on the platen and is fitted with a ring member 37 secured by bolts 39 and having a projecting shoulder which limits the upward movement of the work support. The lower die 33 is provided with a central opening 45. An upper die 48 secured to the ram is adapted in its descent to pass between the member 37 and die 33 and is fitted with a ring 49 which co-operates with the inner edge of the member 37 to trim the edge of the blank. A second die which may consist of separate elements 50, 51 is secured to a member 52 engaged by pins 57 operated by the piston 56 of a fluidpressure cylinder 55 forming part of the ram. A shoulder 53 limits the downward movement of the member 62 in the die 48. The cylinder is supplied from a reservoir 58 in the ram containing fluid under pressure, the flow passing to the cylinder through a valve 60 which is normally held on its seating by the piston 63 of the cylinder 62 supplied at a predetermined pressure from a line 61. When a predetermined pressure in the cylinder 55 is exceeded the valve is opened and pressure is relieved by flow of fluid back to the reservoir. The piston 56 is subsequently returned to its normal position by reverse flow from the reservoir to the cylinder. The ram 14 also carries a punch 70 which cuts out the central hole in the work and passes into the hole 45. In operation, during the descent of the ram the edge of the blank is trimmed off, the member 34 is moved down against the resistance of the cylinders 15 while the central part of the blank is shaped between the dies 50, 33. This action arrests the die 50 and on further movement of the ram the die 48 shapes the brake engaging surface 72, Fig. 4. while the piston 56 is forced back by the pins 57 and the pistons 16 are forced back by the pins 35. When the ram ascends the piston 56 is returned to its lower position by flow from the reservoir through the valve 73. To prevent the support 34 from following the ram the support may be kept in its lower position by the action of the valve 22. In a modification, Fig. 7, the ram 75 is operated through one crank shaft and a concentric plunger 78 is operated by another crank shaft. The ram 75 is resiliently connected through spring bolts 83 with a member 81 carrying a die 82 co-operating with the die 33 and the outer die 86 is engaged by pins 88 actuated by the head 89 of the plunger 78 which also carries the central punch. The central part of the blank is shaped with the parts in the position shown in Fig. 7 and subsequently the plunger is operated to force the die 86 and support 34 downwardly thus trimming the edge of the blank and shaping the brake engaging rim portion.