GB968266A - The ultrasonic machine tool - Google Patents

Abstract

968,266. Ultrasonic grinding. V. N. BARKE, N. I. BLITSTEIN, I. M. GRIAZNOV, A. L. LIVCHITS, B. K. MECHEINER, S. S. PODLAZOV, and D. F. YAKHIMOVICH. Sept. 8, 1960, No. 28628/60. Heading B3D. [Also in Division H4] A machine for grinding by ultrasonic means comprises a transducer 5, Fig. 2, attached to a frame by a support 8 which extends in a direction parallel to the axis of vibration of the transducer and, in operation, vibrates in a direction parallel to this axis with its nodal point co-incident with its point of attachment to the frame. The tool head 3, which is mounted above a compound work-supporting table, is carried by a slide 4 adjustable vertically on an upright by a motor-driven pinion 22 engaging a rack 21 on the slide which is counterbalanced by a weight 25 operating through a further rack-and-pinion 28; a damper 32a is provided which may be adjusted to give a greater damping effect in one direction than the other. The holder 7 of the tool 7a is fixed to a flange 6 at the end of a thin-walled tube constituting the support 8, the core of the transducer 5 being secured to the flange 6 by welding or silver soldering; the sleeve 8 is held at its nodal point by a thick grooved flange 11 in a bush 9 rotatable by a worm 13. Coolant is supplied to the space around the transducer core by a feed pipe 14 and is maintained at a level below the top of the core by an extraction pipe 15. The bush 9 and surrounding casing 16 may be vertically adjusted on the slide 4 and locked by a clamping screw 17. Abrasive slurry is fed to the work by a centrifugal pump, and in the modification shown in Fig. 6, the tool may be automatically retracted at pre-set intervals to permit the supply of abrasive slurry to the work from a pump which delivers it through a duct 37, Fig. 6, to a ring-shaped duct 38 surrounding the tool holder. Jets 36 keep the suspension circulating in the pump reservoir 41 to which the slurry is returned from a perforated tray 39.