A method and an apparatus for forming a profile groove in an elongated key blank having a key blade with opposite side surfaces. The profile groove is formed in a surface of the key blank by a punching or a broaching tool with at least one tooth. The punching or broaching tool is forced and guided longitudinally in parallel to the key blank so as to cut out the material of the key blank into the desired profile shape, corresponding to the cross-sectional shape of the at least one tooth. At the same time, the opposite side surfaces portions of the key blank are clamped or held firmly between opposite holding surfaces of a fixture, causing a firm abutment and retaining action on the longitudinal side surface portions of the key blank located adjacent to and all along the profile groove being formed.

The provided method and material-removing tool serve for producing an exact-fit cylindrical bore with a high degree of surface quality and a length that may be a multiple of the diameter from an existing bore with a finishing allowance. In order to reduce the time taken for the finishing by means of a reamer to be performed, it is proposed to use a tool in the form of an impact die, which is formed at the front end with a circular or substantially circular cutting edge, the diameter of which corresponds to the nominal diameter of the bore to be produced, and which tapers from directly behind the cutting edge or behind a front region of a certain length.

The provided method and material-removing tool serve for producing an exact-fit cylindrical bore with a high degree of surface quality and a length that may be a multiple of the diameter from an existing bore with a finishing allowance. In order to reduce the time taken for the finishing by means of a reamer to be performed, it is proposed to use a tool in the form of an impact die, which is formed at the front end with a circular or substantially circular cutting edge, the diameter of which corresponds to the nominal diameter of the bore to be produced, and which tapers from directly behind the cutting edge or behind a front region of a certain length.

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.

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 broach or broach segment has a spine. A longitudinal array of teeth protrude from the spine, each tooth having: a first face and an opposite second face; and a distal surface joining the first face and second face; and at least some of the teeth being firtree teeth and have a peripheral trench adjacent the cutting edge of the at least one tooth.

A broach or broach segment has a spine. A longitudinal array of teeth protrude from the spine, each tooth having: a first face and an opposite second face; and a distal surface joining the first face and second face; and at least some of the teeth being firtree teeth and have a peripheral trench adjacent the cutting edge of the at least one tooth.

A method for manufacturing a barrel arbor (1) used in horology, arranged to pivot around a pivot axis (D). The method including the following steps: taking a bar; profile-turning the bar to form at least one cylindrical portion (13) including a vertical surface and a horizontal surface; machining the cylindrical portion (13) to form the core that includes a hook (2), a support surface (3) and a countersink (4); and simultaneously using a broaching tool by making several translational to-and-fro movements in the direction of the pivot axis (D) of the arbor.

A method for manufacturing a barrel arbor (1) used in horology, arranged to pivot around a pivot axis (D). The method including the following steps: taking a bar; profile-turning the bar to form at least one cylindrical portion (13) including a vertical surface and a horizontal surface; machining the cylindrical portion (13) to form the core that includes a hook (2), a support surface (3) and a countersink (4); and simultaneously using a broaching tool by making several translational to-and-fro movements in the direction of the pivot axis (D) of the arbor.