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US 2015/0336192 A1Published application
Helical broach
AssigneeMitsubishi Heavy Industries, Ltd.
InventorYasuhito KATSUKI
Life of this patent
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Abstract
The shell of this helical broach (1) is formed by stacking a plurality of wafer shells (20W(1)-20W(N)) in the axial direction, and is obtained by forming on the wafer shells (20W(1)-20W(N)) finishing blades (30W(1)-30W(N)) corresponding to teeth grooves on a piece to be cut (W) and forming the finishing blades (30W(1)-30W(N)) such that the blade width gradually increases with each of the aforementioned wafer shells (20W(1)-20W(N)) from the leading end of the cutting direction toward the trailing end of the cutting direction.
Claims4
A helical broach comprising:
- a cylindrical shell in which finishing blades having a predetermined tooth gear helix angle are formed on an outer peripheral side,
- wherein the shell includes a plurality of wafer shells and has a structure divided in an axial direction,
- the wafer shells have finishing blades corresponding to tooth grooves in a piece to be cut, and
- in the finishing blades in the plurality of wafer shells, a blade width gradually increases with each of the wafer shells from a leading end of a cutting direction toward a trailing end of the cutting direction.
1 more element
Dependencies are inferred from the claim text.