Patent GB-938616-A (GB)
Title: Improvements in or relating to swaging machines
IPC: B21J7/14
Filed: 1960-02-01
Abstract: 938,616. Swaging machines. GES. FUR. FETIGUNGSTECHNIK UND MACHINENBAU G.m.b.H. Feb. 1, 1960 [Feb. 14, 1959], No. 3415/60. Class 83 (4). A swaging machine 1, with hammers driven by eccentrics in housings which are rotatably adjustable for varying the stroke position and a gripping head 2 movable for feeding the workpiece, has its stroke adjustment and feed movement effected automatically by hydraulic motors controlled through electrically-operated valves by a stepping switch and limit switches actuated by adjustable cams. The hammers in a swaging head 1 are driven by a motor 4 and their eccentric housings carry gear-ring 5, Fig. 3, meshing with a central gear 6 driven by a pinion 9 meshing with rack teeth on a vertically movable cylinder 10. The latter contain a stationare piston 11 with differential pressure surfaces whose underside is open continuously to pressure oil through conduit 13 whereby the cylinder 10 is biased to its bottom position abutting a stop 15 and the hammers are then in their fully-open position. Pressure oil may be admitted through a conduit 14 under the control of electromagnetically-actuated valves, Fig. 8 (not shown), to the larger-area upper side of piston 11 thereby raising the cylinder 10 into abutment with an adjustable stop 21. A valve-controlled throttle provides two speeds of upward movement of the cylinder 10 in the closing direction of the hammers. The stop 21 is mounted on an internally threaded sleeve 20 screwed on the threaded end 19 of piston rod 12 and adjusted by a worm wheel 22 meshing with a worm 23, Fig. 4, driven through electromagnetic clutch 25 by a motor 24. An electromagnetically operated brake 26 is engaged when the clutch 25 is open and vice versa. The brake may be released to permit manual adjustment of the stop 21. Secured to the latter is a control plate 36 with parallel vertical grooves receiving adjustable cams 37 which co-operate with limit switches 39 on a stationary bridge 40. The gripping head 2 is movable horizontally along a bed 3 by an hydraulic motor 29 which is biased continuously to the right and is moved to the left by hydraulic fluid admitted to its larger outer surface under the control of electromagnetically-actuated valves, Fig. 10 (not shown). Two hydraulic pumps and a valve-controlled throttle enable three speeds of advance and return movement of the head. A motor 31 is also provided for rotating the workpiece. Limit switches 35, Fig. 6, on a bracket 34 secured to the head 2 cooperate with cams 32 adjustable in parallel horizontal grooves of a control-plate 33 fixed to the bed 3. A rotary stepping switch 94, 95, Fig. 11 (not shown), is in circuit with the limit switches 32, 39 controlling the electromagnetically actuated valves and at the termination of one stage of the swaging operation, for example high-speed forward movement of the head 2, by means of the relevant limit switch, the selector switch is moved automatically, after a variable time delay, to the next position to initiate the next stage, for example lowspeed forward movement of the head. An additional limit switch 41 on the bridge 40, Fig. 2, ensures that the cylinder 10 must be against the stop 21 before the stepping switch can initiate the next stage in the swaging operation. Movement of the head 2 and stroke positioning of the hammers may be controlled jointly by one or more templates 49, Fig. 6, co-operating with a roller follower 52 on a feeler rod 51. This is linked at 53 to a crank arm 55 which is connected by chain drives 56, 57, shaft 59, Fig. 2, and chain drive 60 to a pinion 61 meshing with a vertical rack 62. The latter actuates directly or thruogh linkage 66, 67, a slide valve 48 controlling the upward movement of the cylinder 10 for closing the hammers. A piston 64 connected to the rack 62 operates in a cylinder 65 to bias the roller 52 against its templates 49. A second gripping head may be disposed to the rear of the swaging head 1. A scale 27, Fig. 1, indicates the stroke position of the hammers.