GB972365A - Improvements relating to apparatus for cutting gears and the like - Google Patents

Abstract

972,365. Gear-cutting. GLEASON WORKS. Oct. 1, 1963 [Oct. 8, 1962 (2)], No. 38655/63. Heading B3K. Apparatus for cutting gears comprises a face mill cutter having a body 35 rigidly supporting a set of inside and outside cutting blades 47, 48, a member 43 movable on the body and supporting a second set of inside and outside cutting blades approximately on the same circle, and means operable during rotation of the cutter to reciprocate the member to offset the blades into cutting and non- cutting positions. In a machine for formcutting spiral bevel gears, the work support is fed by a pull-rod 32, Fig. 7, attached to a piston 31. The initial cutting position is determined by an adjustable stop 33 and the feed is controlled by a cam 21, rotated once for each tooth cut, acting through a lever 23 and an adjustable block 25. The cutter body 35, Figs. 2 and 3, is secured to the spindle 12 by screws 38 and engages a conical spigot 36. Sets 41 of three roughing blades (47 cutting outside, 48 inside and 49 bottom) are secured to the body by screws 39. The slide 43 carries an outside finishing blade 44 and an inside blade 45. The slide is guided by studs 51 and is moved by cams 61, 58 on a sleeve attached to a piston 55 and engaging tapered surfaces in a bore in the slide. Thus, movement of the piston 55 either retracts or advances the blades in unison. In the cutting position, the piston 55 pulls rearwardly a plate 69 which engages surfaces 72 on the slide 43 and clamps it. A spring guard 75 having slots filled with rubber assists in releasing the clamp plate 69 and prevents the ingress of dirt. Before the finishing blades take a cut, the cutter may be slightly retracted by operation of the piston 33 to prevent the roughing blades contacting the gear-teeth. In a modification, the cutter slide 143, Fig. 8, is moved to finishing position by a piston 123 acting on a lever 125 which depresses a rod 115 projecting from the spindle 112. In a further modification, the cutter slide 243, Fig. 10, has wedge surfaces 236 so that the tips of the blades are moved to a position for finishing the slot bottoms as well as the sides for finishing the tooth flanks. In a final modification, the roughing blades 363, Fig. 13, are mounted on a member 349 moved to cutting position by fluid supplied to a chamber 348. When the pressure is released, the blades are withdrawn by springs 354 and the cutter slide carrying the spindle 312 and the cutter body 335 is advanced by retraction of the piston 33, Fig. 7, so that the finishing blades 342 are advanced to cutting position. The blades are secured by screws 364, 343.