A multi-lip drilling tool is described, in which main cutting edge transitions in the region of the drill into a center lip section, wherein a cooling duct that leads to the drill tip is formed in each drill web. The invention minimizes tensile stress spikes in the chip flute base, while at the same time ensuring that a hitherto unachievable coolant/lubricant quantity gets to the engaged main blade. This is ensured by selecting a duct cross sectional form similar to an unsymmetrical kidney, in which it is ensured the selected radii of curvature for the individual boundary curve sections causes as much coolant/lubricant as possible to arrive at the blade or in proximity thereto in the fastest way via the point thinning and its edges intersecting with drill core.

A nozzle body wherein replacement with cutting tool is easy and oscillation is small, and machine tool to which nozzle body can be attached, machine tool being equipped with turret having simple construction. Nozzle body includes: a body; a shank that is attached to a main spindle of machine tool: shaft body that is provided in a protruding manner on shank and rotatably supported by the body; annular path that is provided on outer circumference of shaft body; a discharge orifice that is provided at the leading end of shaft body; a first path that is provided inside shaft body and provides communication between discharge orifice and annular path; detent that is provided to the body; and a second path that is provided to the body and opens into the detent, the second path communicating with the annular path.

A three-flute drill having: a tool main body with cutting edges at an axially distal end thereof, a flute portion having discharge flutes in a distal-end side portion of the body, and a cutting fluid supply hole for supplying fluid toward the edges, a rear inner wall surface on the radial direction on a rear side in the drill rotation direction and opposed to the front inner wall surface in a drill circumferential direction, an outer circumferential inner wall surface made up of a partially cylindrical surface whose center lies on an axis of the drill, and an inner circumferential inner wall surface having a partially cylindrical surface whose center lies on the drill axis and opposed to the outer circumferential inner wall surface in the radial direction, the inner circumferential inner wall having a curvature radius smaller than that of the outer circumferential inner wall surface.

The invention relates to a rotary tool (2), in particular a drill, having a cutting part (10) that extends in a longitudinal direction (8) from a clamping shank (6) arranged in a rearward region (22) to a tool front (12) arranged in a forward region (20), and in which helically running chip flutes (14) and continuously helically running coolant channels (36) are fashioned, such that an exit opening (42) of each coolant channel (36) is arranged in the respective chip flute (14), wherein the chip flutes (14) are each shaped with an angle of twist () varying in the longitudinal direction (8) such that, in the forward region (20) facing towards the tool front (12), the respective coolant channel (36) is intersected by the respective chip flute (14) so as to fashion the exit opening (42).

A drill with a cutting fluid supply hole includes: a tool main-body with an axial end cutting-edge, a portion having a discharge flute on a main-body distal end side portion, and a cutting fluid supply hole, the hole having a fan-shaped cross section defined by a front inner-wall surface located along a main-body radial direction on the front side in the drill rotation direction, a rear inner-wall surface located along the radial-direction on the rear side in the drill rotation direction and facing the front inner-wall surface in a main-body circumferential direction, an outer circumferential inner-wall surface made up of a partially cylindrical surface around a drill center line, and an inner circumferential inner-wall surface made up of a partially cylindrical surface around the center line with a curvature radius smaller than that of the outer circumferential inner-wall surface and facing the outer circumferential inner-wall surface in the radial direction.

A rotary cutting tool with an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline-diamond cutting tip. The cutting tip comprises an inner portion having an inner point angle and an outer portion having an outer point angle different from the inner point angle.

A rotary tool for machining workpieces, comprising at least one main body with a clamping segment, a tool head comprising a cutting region, and at least one coolant channel for feeding a cooling and lubricating fluid into the cutting region. At least one partial surface section of the cutting region forms a hardened region, which covers and/or defines the coolant channel and is surface-hardened. A method for producing a rotary tool.

The invention is directed to a drill system that better uses the power curve of modern machine tools. The drill system uses IC inserts to perform the major hole diameter cutting, and a central drilling system that cuts the remaining minor diameter portion of the hole, and is configured to see less cutting surface footage, due to its position from the rotating center of the tool. A connection between the drill head and a holder body secures the drill head in a manner to effectively absorb lateral drilling forces. The drill system allows for a large diameter deep hole that remains straight throughout to be drilled at higher speed and lighter feed rates thus offering a more productive tool that takes advantage of the power curves and lower thrust capabilities of modern machine tools.

A rotary cutting tool comprises an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline-diamond cutting tip. The cutting tip comprises an inner portion having an inner point angle and an outer portion having an outer point angle different from the inner point angle.