Index generation method and machine for production of bevel gears
AssigneeVeb Werkzeugmaschinenkombinat "7.Oktober
InventorsLothar Bachmann, Karl-Heinz Engemann
Life of this patent
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Abstract
Pitch generation method for the production of bevel gears and mainly for the rough hobbing of pinions, with working of the pinion blank during generating of the tooth profiles, using a single cutter head for working both flanks of each tooth space. The generating speeds and ratio of roll of the cutter head, as well as the profile angle of the cutters are kept uniform. The desired, curved outlines of the tooth flanks, establishing a tapering tooth space, are generated by a simple mechanism which generates the proper motions of the gear cutters. For this purpose the cutter head is pivoted, opposite the workpiece or gear blank, in a drum, for several swiveling motions.
Claims15
In the rolling method for producing spiral and hypoid bevel gears wherein a cradle supported in a tool holder is rotatable about a cradle axis and supports a spread blade cutter head rotatable about a cutter axis spaced from and parallel to the cradle axis and together with the cutter moves in one rolling direction relative to the tool holder and to the turning work piece to cut one tooth flank of a tapering tooth gap and moves in the opposite rolling direction relative to the tool holder and to the turning work piece to cut the other tooth flank of the tapering tooth gap;
- the improvement in that the work cycle comprises:
- cutting the one tooth flank by rolling the rotating cutter head in the first direction with a specific ratio of roll between the cradle and the workpiece so that the axis of the cutter head rolls from a first position along a first arcuate path about the cradle axis to a second position at the end of the first arcuate path;
- then, swinging the rotating cutter head toward the other tooth flank about a swivel axis parallel to and offset from the axes of the cradle and cutter head so that the axis of the cutter head is swung to a third position, the second and third position of the cutter head axis lying along the path of a swivel arc generated about the swivel axis and also lying along an arc intersecting the swivel arc at the second and third positions of the cutter head axis and generated about an axis situated on the center line of the tapering tooth gap at the narrowest location thereof;
- then, cutting the other tooth flank by rolling the rotating cutter head in the opposite direction with the same ratio of roll between the cradle and work piece so that the axis of the cutter head rolls from the third position to a final position along a second arcuate path spaced from and concentric with the first arcuate path;
- then, in the final position of the cutter head, swinging the cutter head about the swivel axis to dispose the axis of the cutter head in the first position.
In a machine for producing bevel and hypoid gears having a tool holder, a cradle, means mounting said cradle in said tool holder for rotational movement about a cradle axis, a slide member, means mounting said slide member in said cradle for linear movement radially of the axis of said cradle, a spread blade cutter head, and means mounting said spread blade cutter head in said slide member for rotational movement about a cutter head axis parallel with and offset radially from the axis of said cradle, the improvement comprising further means mounting said cutter head in said slide member for swiveling movement of said cutter head about a swivel axis parallel with and radially offset from the axes of said cradle and of said cutter head.
Dependencies are inferred from the claim text.