Axial hob with multi-revolution cutting teeth
AssigneeThe Gleason Works
InventorsTakahiro Matsubara, Hermann J. Stadtfeld
Life of this patent
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Abstract
An axial hob (14) with cutting teeth (16) which are arranged around a cylinder (19) in a helical pattern. The cutting front (18) is perpendicular to the helix. The re-grindable blade thickness is oriented in the direction of the helix lead direction. While the tool rotates, the active cutting front changes from one blade to the next which, depending on the hand of rotation, is an advanced or retracted position. However, the rotation will not give the individual blades a chip removing motion but only position the following blade in an advanced or retracted location, such as in a gear slot to be machined.
Claims10
An axial hob for machining gears and other toothed articles, said axial hob being cylindrically shaped and comprising:
- a length, a diameter and a pair of axially opposed ends, an axis of rotation extending the length of said hob with said axial hob being rotatable about said axis, a plurality of cutting teeth arranged about said hob, said teeth being oriented in a first direction defined by a first helix angle with respect to said axis of rotation, wherein each of said cutting teeth includes a cutting face and wherein all cutting faces are oriented toward one of said axially opposed ends.
A method of manufacturing a gear from a gear workpiece with an axial hob, said gear workpiece having an axis of rotation, said method comprising:
- providing an axial hob, said axial hob being cylindrically shaped and comprising a length, a diameter and a pair of axially opposed ends, an axis of rotation extending the length of said hob with said axial hob being rotatable about said axis, a plurality of cutting teeth arranged about said hob, said teeth being oriented in a first direction defined by a first helix angle with respect to said axis of rotation, wherein each of said cutting teeth includes a cutting face and wherein all cutting faces are oriented toward one of said axially opposed ends,
- rotating said hob and said gear workpiece about their respective axes of rotation at a predetermined ratio,
- orienting said axial hob axis of rotation at an inclination angle with respect to the gear workpiece axis,
- moving said hob across an outer surface of said gear workpiece in a feed direction parallel to the axis of rotation of said gear workpiece.
Dependencies are inferred from the claim text.