Method and tool for roughening an inner surface of a cylindrical bore

A tool (1) for roughening an inner surface (8) of a cylindrical bore (9), having

• a radial cutting head (7), which has at least one cutting edge for lifting off a shaving (12) and at least one further edge or surface for breaking off the shaving (12) in order to generate a roughened surface,
• a tool receiver (2), designed to interact with a machining tool, and
• a tool tip (6) opposite the tool receiver (2) in the axial direction,
• wherein a further radial cutting head (16) is arranged for finishing the inner surface (8) of the cylindrical bore (9) in the axial direction between the tool receiver (2) and the radial cutting head (7) for roughening the inner surface (8) of the cylindrical bore (9), and
• wherein at least one flushing medium (14) is provided with a respective flushing medium outlet (15, 17) corresponding to the radial cutting head (7) and the further radial cutting head (16), wherein the flushing medium outlet (15), which corresponds to the radial cutting head (7) for roughening the inner surface (8) of the cylindrical bore (9), is foamed with a directional component in the direction of the tool tip (6), and the flushing medium outlet (17) which corresponds to the radial cutting head (16) for finishing the inner surface (8) of the cylindrical bore (9) is formed with a directional component in the direction of the tool receiver (2).

The tool (1) for roughening an inner surface (8) of a cylindrical bore (9), having

• a radial cutting head (7) which has at least one cutting edge for lifting off a shaving (12) and at least one further edge or surface for breaking off the shaving (12), in order to generate a roughened surface,
• a tool receiver (2) designed to interact with a tool machine, and having a tool tip (6) lying opposite the tool receiver (2) in the axial direction,
• wherein a further radial cutting head (16) for finishing the inner surface (8) of the cylindrical bore (9) is arranged in the axial direction between the tool receiver (2) and the radial cutting head (7) for roughening the inner surface (8) of the cylindrical bore (9),
• wherein at least one flushing medium line (14) is provided with a respective flushing medium outlet (15, 17) corresponding to the radial cutting head (7) and the further radial cutting head (16),
• wherein a third radial cutting head (19) for trimming potentially remaining protrusions of shavings (12) is provided which is arranged between the radial cutting head (7) for roughening the inner surface (8) of the cylindrical bore (9) and the tool tip (6) in the axial direction, and which is arranged to be offset to each of the two other radial cutting heads (7, 16) in the peripheral direction, wherein the third radial cutting head (19) is formed without a flushing medium supply.