A reamer has a shank made of steel and a cutting body made of a harder material, wherein the cutting body forms the outer circumference of the reamer in the region of the workpiece side end and has all the cutting ribs.

A machining tool for deburring boreholes, which lead laterally into a recess, comprising: a shaft; a cutting head with at least one circumferential cutting blade associated with a chip groove and having a cutting edge extending, at least in sections, in an axial direction, and which can perform a cutting process by virtue of relative movement between the tool and a workpiece, and which lies on a virtual cylindrical rotation surface; and at least one cutting-blade-free and chip-groove-free surface area; at least one fluid channel closed on the cutting head side, extending through the shaft into the cutting head; and at least one branch channel with an outlet opening. The outlet opening is in a dynamic pressure active surface radially set back relative to the virtual rotation surface, and is larger than a flow cross-sectional area of the at least one branch channel at the outlet opening.

A multi-part modular tool rotatable about a longitudinal tool axis (A), comprising: a machining head; a first holding element comprising a body elongated along the longitudinal axis (A) of the tool, in which a passage extends along the longitudinal axis (A) of the tool; a second holding element which can extend in the passage of the first holding element; wherein the machining head can be connected to the second holding element in such a way that the machining head is fixed firmly to the first holding element at least in the axial direction (A) and/or in the radial direction (R), and wherein the passage of the first holding element and the second holding element are adapted to one another such that during a connection process in which the machining head is connected to the second holding element, the second holding element is movable relative to the first holding element.

The invention relates to a tool for forming a drilled hole (B), comprising a shank that is rotatable or rotates about a tool axis (A), at least one first portion, which is rotatable or rotates about the tool axis (A), for producing and/or widening a drilled hole (B) by chip cutting, and a second portion, which rotates about the tool axis (A), for widening a drilled hole (B) without chip cutting, wherein the second portion is arranged behind the first portion in a direction of advance (V) of the tool. The invention additionally relates to a method for producing a drilled hole (B).

According to one implementation, a hole finishing tool includes a reaming cutter and a holder. The reaming cutter has a first detaching structure. The first flow path for ejecting cutting oil is formed inside the reaming cutter. The holder has a second detaching structure. The second detaching structure is detached from and attached to the first detaching structure. The second flow path for supplying the cutting oil to the first flow path is formed inside the holder. The holder has a shank. The shank is held by a tool rotating device. The holder has a sliding portion. The sliding portion has no back taper. The sliding portion is inserted into a positioning bush and slid inside the positioning bush. The sliding portion has a concave portion for storing lubrication oil.

The invention relates to a reamer (3), having a main body (5) and at least one cutting tip (1) arranged on the main body (5), the cutting tip (1) having a reamer section (7), the cutting tip (1) having, at a distance (A) from the reamer section (7), a roughening section (9) having at least one roughening blade (11), the at least one roughening blade (11) protruding beyond the reamer section (7) by a particular projection (D).

A machining tool forms a first relief surface, a valve seat surface, and a second relief surface by cutting the inner periphery of a valve seat blank having an opening. The machining tool is provided with: a tool body rotationally driven about an axis; a plurality of cutting tools rotating with the tool body; a cartridge mounted to the tool body so as to be capable of moving forward and backward along the axis; and a cam in contact with the base end surface of the cartridge and moving the cartridge forward and backward. At least one of the plurality of cutting tools is mounted to the cartridge.

A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.

A machining tool forms a first relief surface, a valve seat surface, and a second relief surface by cutting the inner periphery of a valve seat blank having an opening. The machining tool is provided with: a tool body rotationally driven about an axis; a plurality of cutting tools rotating with the tool body; a cartridge mounted to the tool body so as to be capable of moving forward and backward along the axis; and a cam in contact with the base end surface of the cartridge and moving the cartridge forward and backward. At least one of the plurality of cutting tools is mounted to the cartridge.

A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.