GB840927A - Stretch-forging machine - Google Patents

Abstract

840,927. Swaging-machines. KRALOWETZ, B. Sept. 12, 1956, No. 27845/56. Class 83 (4). A swaging-machine comprises hammer tools 3 carried by connecting-rods 2 slidable through rotatable guide-members 6 and actuated by eccentrics 1 on shafts 4 rotatable in eccentric bushings 7, Fig. 5, which are adjustable for varying the hammer stroke, the axes of the shafts 4 and the guide-members 6 being normal to the axis of the workpiece 5, whereby during the instroke of the hammer tools, the latter swing about the axes of the guide members and in the longitudinal direction of the workpiece for feeding it forwardly automatically. The machine may have three or preferably four tools with one pair of opposite tools striking out of phase with the other pair so enabling the use of wide face tools for swaging rectangular section workpieces, Fig. 4 (not shown). The driveshafts 4 are driven by an electric motor 13 through spur-gearing 15 and worm gearing 16, 17. The eccentric bushes 7 are rotated by worm gearing 8, 9 connected by universal-joint shafts 12 to a common gear-box 11 having a hand wheel 10. The guide members 6 are rotatably mounted in radially slidable blocks 21 which are adjustable for varying the swing of the hammer tools by blocks 23 mounted on a common rotatable ring and engaging in oblique grooves 22 in the blocks; the ring is rotated by a hand wheel 25, Fig. 8. Fluid-pressure actuated wedges 32, Fig. 7 (not shown), lock the blocks in position. For swaging tubes, a mandrel 33, Fig. 8, carried on a spring-loaded rod 34 may be used. The mandrel is advanced and retracted by fluidpressure pistons 35, 35a in a cylinder pivoted on a pin 37 whereby after retraction the entire mandrel cylinder assembly may be swung out of the way. The swaging mechanism is mounted in a housing 29, 30 which may be swung about a pivot 38 to facilitate assembly and disassembly. Spring-biased gripping jaws 39, Fig. 10, disposed in a housing 53, are mounted on the inlet and, if desired, also on the outlet end of the machine. These jaws are pivoted on pins 40 in a carrier 59 and are biased by a common spring 41 through push-rods 43 and linkage 45, 46, 47, Fig. 9 (not shown). For rotating the work-piece during swaging, the carrier 59 is rotated within its housing 53 by a motor 61, Fig. 14 (not shown), which drives teeth 60 on the carrier through spur gearing. The loading of the jaw spring 41 is adjustable during rotation of the jaws, by a cam-ring 54 rotated by a handle 58, Fig. 8.