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US 9,925,607 B2Granted
Helical broach
AssigneeMitsubishi Heavy Industries Machine Tool Co., Ltd.
InventorYasuhito Katsuki
Life of this patent
Estimating the term…
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, with respect to an axial direction of the helical broach, corresponding to tooth grooves in a piece to be cut are formed on an outer peripheral side,
- wherein the cylindrical shell includes a plurality of wafer shells assembled coaxially and side by side along an axial direction of the helical broach, each wafer shell having finishing blades having the predetermined tooth gear helix angle with respect to the axial direction;
- 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.