A method for machining a crankcase includes providing a machining device. The machining device comprises a mechanical machining unit and a cooling/rinsing system, which is configured to cool and/or rinse the mechanical machining unit or a surface which is to be machined. The method also includes creating a structure in a cylinder wall of a crankcase using the mechanical machining unit. The method also includes using a fluid stream of the cooling/rinsing system to reshape at least certain regions of the structure.

A method for machining a crankcase includes providing a machining device. The machining device comprises a mechanical machining unit and a cooling/rinsing system, which is configured to cool and/or rinse the mechanical machining unit or a surface which is to be machined. The method also includes creating a structure in a cylinder wall of a crankcase using the mechanical machining unit. The method also includes using a fluid stream of the cooling/rinsing system to reshape at least certain regions of the structure.

In a tool holding portion of a machining tool, a cartridge is provided so as to be movable forward and backward. A cam accommodated inside a cam accommodation portion rotates while the cam is in abutment against the cartridge to thereby move the cartridge forward and backward. A rod which moves forward and backward inside a tool body along an axis is provided with an abutment portion. The abutment portion abuts against an abutment position of the cam according to the forward and backward movement of the rod to thereby rotate the cam. A restriction mechanism is capable of adjusting the phase of the cam when the abutment portion is apart from the abutment position so that a reference position is reached where the abutment position faces the abutment portion.

In a tool holding portion of a machining tool, a cartridge is provided so as to be movable forward and backward. A cam accommodated inside a cam accommodation portion rotates while the cam is in abutment against the cartridge to thereby move the cartridge forward and backward. A rod which moves forward and backward inside a tool body along an axis is provided with an abutment portion. The abutment portion abuts against an abutment position of the cam according to the forward and backward movement of the rod to thereby rotate the cam. A restriction mechanism is capable of adjusting the phase of the cam when the abutment portion is apart from the abutment position so that a reference position is reached where the abutment position faces the abutment portion.

A combined skiver and a smooth rolling tool with a skiver head and behind this a smooth rolling head, wherein between the skiver head and the rolling head an exclusive torque transmitting coupling is located which restricts the allowable axis shaft offset and/or the angular position of the axes of the rolling head and skiver head, to which the rolling head is connected, characterized in that the skiver head (2) is guided through a workpiece bore via a hydrostatic guideway.

A combined skiver and a smooth rolling tool with a skiver head and behind this a smooth rolling head, wherein between the skiver head and the rolling head an exclusive torque transmitting coupling is located which restricts the allowable axis shaft offset and/or the angular position of the axes of the rolling head and skiver head, to which the rolling head is connected, characterized in that the skiver head (2) is guided through a workpiece bore via a hydrostatic guideway.

Provided is a machining apparatus capable of improving the positioning accuracy of a machining tool as compared to conventional machines. A machining apparatus 1 includes a rotating tool, a machining tool provided on an outer periphery of the rotating tool, and a spindle head adapted to rotatably support the rotating tool. The machining apparatus includes a driving portion configured to move the spindle head in a direction perpendicular to an axis of rotation R of the rotating tool, a position sensor configured to measure a position of the spindle head on a plane perpendicular to the axis of rotation R, and a control unit configured to control the driving portion so as to move the machining tool in a direction perpendicular to the axis of rotation R of the rotating tool on the basis of the position of the spindle head.

To make it possible for bores (16) that are in line with one another to be efficiently worked by means of a boring bar (2), the boring bar has a main body (10) with an axis of rotation (R) and a number of cutting elements (12, 12A) at intervals from one another in the axial direction (4) and also guiding elements (14) for guiding the main body (10) in a guiding bore (16A). The guiding elements (14) are kept at a distance from the axis of rotation (R) equivalent to a guide radius (r1). The main body (10) is divided into a functional region (19) and an eccentric region (10), wherein the cutting elements (12, 12A) and the guiding elements (14) are arranged such that they are distributed around the main body (10) over an angular range (a) of less than 180°. Furthermore, the circumferential side (22) of the main body (10) can be passed eccentrically through a respective bore (16, 16A) of which the unworked tube radius (r2) is less than the guide radius (r1).

A roughening tool for roughening a metallic surface of an inner wall of a pre-drilled workpiece bore is disclosed. The roughening tool has a profiled contour provided between the tool clamping shaft and the tool tip. With this contour, a roughened structure can be produced through rotation of the tool by processing the metallic surface in a material removing or non-material removing manner The roughening tool includes at least one profiled web which extends along the tool axis, protrudes from a main tool part, and on whose outer web back the profiled contour is provided.

A roughening tool for roughening a metallic surface of an inner wall of a pre-drilled workpiece bore is disclosed. The roughening tool has a profiled contour provided between the tool clamping shaft and the tool tip. With this contour, a roughened structure can be produced through rotation of the tool by processing the metallic surface in a material removing or non-material removing manner The roughening tool includes at least one profiled web which extends along the tool axis, protrudes from a main tool part, and on whose outer web back the profiled contour is provided.