The tool holder device for broaching and slotting, comprising: one main frame associated with one machine adapted to machine one workpiece; one working assembly associated with the main frame and comprising one supporting bar movable longitudinally along a first axis and guiding means of the supporting bar movable longitudinally along the first axis; one tool associated with the supporting bar and adapted to machine the workpiece; angular adjustment means for adjusting the supporting bar, interposed between the main frame and the guiding means and adapted to rotate the supporting bar around a second axis substantially orthogonal with respect to the first axis; and straight adjustment means for adjusting the tool with respect to the supporting bar, interposed between the tool and the supporting bar, the straight adjustment means being adapted to adjust the position of the tool along the second axis.

A helical broach which eliminates the need for a fixing means for fixing a workpiece during gear machining is provided. The helical broach includes: a plurality of cutting edges; a spiral flute formed between adjacent cutting edges to extend in a spiral manner with a predetermined helix angle with respect to an axial direction of the helical broach; and a gullet formed between adjacent cutting edges to extend with a predetermined helix angle with respect to a circumferential direction of the helical broach. In the helical broach, the expression: 0.5tan /tan(+)0.7 is satisfied, wherein is the helix angle of the spiral flute, and (90) is the helix angle of the gullet with reference to a central axis of the helical broach. An internal gear machining method using the helical broach is also provided.

Aspects of the disclosure are directed to a first chip ring that includes a first through slot, a second chip ring that includes a second through slot, and a component disposed between the first chip ring and the second chip ring that includes a component through slot, where the first, second and component through slots are coaxial along a slot axis this is oriented at a non-zero valued angle relative to a planar surface of the component facing at least one of the first and second chip rings.

For producing a cylindrical surface that has a surface structure of predetermined geometry suitable for application of material by thermal spraying, a geometrically predetermined groove structure of minimal depth and width is introduced into the surface by a tool embodied as a follow-on tool in that a groove cross-section is processed successively to a final size. In order for the surface to be producible in mass production with constant quality, the groove structure is worked in such that first a base groove is introduced with a groove bottom width that is smaller than the groove bottom width of the finished groove. Subsequently, at least one flank of the base groove is processed for producing an undercut groove profile by a non-cutting action or cutting action wherein the introduced groove structure is deformed in such a way that the groove openings are constricted by upsetting deformations of material.

A cutting edge of a machining tool and a surface treatment method for the same. A cutting edge of a machining tool and a region in the vicinity of the cutting edge, e.g. a region of at least 1 mm and preferably at least 5 mm from the cutting edge, are defined as a treatment region; and substantially spherical injection granules having a median diameter of 1 to 20 m are injected onto the treatment region with an injection pressure of 0.01 MPa to 0.7 MPa in order for dimples having an equivalent diameter of 1 to 18 m and preferably 1 to 12 m, and a depth at least equal to 0.02 m and at most equal to 1.0 m to be formed such that the projected surface area of the dimples is at least equal to 30% of the surface area of the treatment region.

A cutting edge of a machining tool and a surface treatment method for the same. A cutting edge of a machining tool and a region in the vicinity of the cutting edge, e.g. a region of at least 1 mm and preferably at least 5 mm from the cutting edge, are defined as a treatment region; and substantially spherical injection granules having a median diameter of 1 to 20 m are injected onto the treatment region with an injection pressure of 0.01 MPa to 0.7 MPa in order for dimples having an equivalent diameter of 1 to 18 m and preferably 1 to 12 m, and a depth at least equal to 0.02 m and at most equal to 1.0 m to be formed such that the projected surface area of the dimples is at least equal to 30% of the surface area of the treatment region.

Aspects of the disclosure are directed to a first chip ring that includes a first through slot, a second chip ring that includes a second through slot, and a component disposed between the first chip ring and the second chip ring that includes a component through slot, where the first, second and component through slots are coaxial along a slot axis this is oriented at a non-zero valued angle relative to a planar surface of the component facing at least one of the first and second chip rings.

A broaching tool, comprising a shank, a body and a cutting head that comprises at least one rake face. The rake face comprises a cutting edge that comprises a cutting corner at a forward end of the cutting head. The rake face is configured such that upon simultaneously rotating the broaching tool about the axis of the broaching tool and advancing the broaching tool along the axis of the broaching tool in a forward direction, the first corner travels in a first circular helix pattern. Also, a method of forming one or more grooves in a bore-containing structure, the method comprising simultaneously rotating a broaching tool and a bore-containing structure relative to one another about the axis, and moving the broaching tool and the bore-containing structure relative to one another along the axis. Also, methods of making broaching tools, and broaching machines.

A broach tool includes a broach tool rake face with a tailored surface topography.

The shell of this helical broach (1) is formed by stacking a plurality of wafer shells (20.sub.W(1)-20.sub.W(N)) in the axial direction, and is obtained by forming on the wafer shells (20.sub.W(1)-20.sub.W(N)) finishing blades (30.sub.W(1)-30.sub.W(N)) corresponding to teeth grooves on a piece to be cut (W) and forming the finishing blades (30.sub.W(1)-30.sub.W(N)) such that the blade width gradually increases with each of the aforementioned wafer shells (20.sub.W(1)-20.sub.W(N)) from the leading end of the cutting direction toward the trailing end of the cutting direction.