| 摘要 |
1,177,744. Gear-cutting. MICHIGAN TOOL CO. 13 Aug., 1968 [20 Oct., 1967], No. 38698/68. Heading B3L. A machine for form-cutting simultaneously all the teeth of a gear 15 has the workpiece mounted on a reciprocating ram 14 while tho cutters 14 are radially disposed and reciprocable under the control of a drum cam 32 so as to cut the teeth on the advance strokes of the ram, being relieved from the work on the retraction strokes thereof, the cam 32 being designed and arranged to feed the cutters 14 to varying depths during the cutting stroke so that tapered, crowned and run-out gears may be produced. The drum cam 32 is rotated in synchronism with the strokes of the crank-driven ram 16, and controls the transverse movement of a cam follower 43 on a member 41 which has a wedge portion 44 co-operating with a wedge portion 45 of a vertically movable head assembly 46. Movement of the assembly 46 is transmitted to a vertically reciprocable sleeve 21 which carries a tool feed cone 17 and retractor ring 18 which control the tool movements. Incremental feed of the tools to give greater depth of cut is effected by an infeed cam 49 driven by a ratchet 52 and pawl 53 which operate once each stroke of the ram 16 under the control of a cam 31. Adjustment of the tool position, e.g. initially or after sharpening, is effected by means of an adjustable Z-bar 47 in the head assembly 46. Cam 32 is replaceable according to the type of gear to be machined and the profile of each cam 32 is designed to ensure that the tools are positioned at appropriately varying radii during the cutting, strokes. |
