GB800050A - Improvements in or relating to forging machines for manufacturing annular or cup-shaped workpieces - Google Patents

Abstract

800,050. Forging. GES FUR FERTIGUNGSTECHNIK UND MASCHINENBAU G.m.b.H. Feb. 24, 1956 [Feb. 26, 1955], No. 5805/56. Class 83 (4). Annular or cup-shaped workpieces 37, Fig. 6, are mounted on a rotatable and axially movable mandrel 20, clamped against the mandrel by a rotatable holder-up member 34, and swaged by radial hammers 2, 3, Fig. 4. The hammers are mounted in a stationary head 1 and are actuated by eccentric shafts 4 interconnected by gearing 14, 15, 16 and driven through a driving pinion 13 by a motor 12, Fig. 1. The eccentric shafts 4 are mounted in eccentric bushings 5 all of which may be rotated in unison, for adjusting the stroke of the hammers, by gears 6 meshing with a common central gear 7. The rotation is effected by an hydraulic control piston 9 connected with a rack 8 which drives a pinion 10 in mesh with one of the gears 6. The mandrel 20, Fig. 6, is connected to a rotating quill 26, Fig. 5 (not shown) mounted in a carriage 22, Fig. 1, movable along guides 21, and driven by a motor 23. The free end of the mandrel is supported within an insert 36, Fig. 6, of the holder-up member 34 rotatably mounted in the head. Different mandrels, or detachable mandrel ends, and inserts 36 are used to suit different workpieces. The carriage is pressed to the left for clamping the workpiece 37 between the insert 36 and mandrel 20, by hydraulic pistons 32, Fig. 1, connected to the carriage by rods 33 passing through the head 1, Fig. 3 (not shown). A sleeve 27, Fig. 6, surrounds the mandrel and supports it radially within a flanged guide 38. The sleeve 27 is movable axially relative to the mandrel by an hydraulic piston 29, Fig. 5 (not shown), in the carriage, for ejecting the workpiece from the mandrel during the retraction thereof. In another embodiment, Fig. 7, the workpiece 45 is moved to the left during swaging and the holder-up 39, which has a replaceable insert 46 engaging the workpiece, is rotatably mounted in a piston 40 slidable in an hydraulic cylinder 42 from which the exhaust of pressure liquid, and hence the rate of movement of the piston, is controlled by an adjustable throttle 41. After swaging, the piston 40 is moved further to the left to permit the workpiece to be ejected by the sleeve 27 through an aperture 43. The stroke of the hammers may be controlled automatically in dependence upon the movement of the carriage 22 by a templet 47, Fig. 2 (not shown). The mandrel 22 may be watercooled.