Process and device for manufacturing workpieces with non-circular inner or outer contours as well as eccentrically positioned round boreholes and/or journals

A device for machining a workpiece rotating with a constant rotational speed about a rotation axis to produce a contour, wherein said contour has an imaginary inner circumference and an imaginary outer circumference, said inner circumference representing the shortest radial distance from the workpiece axis of rotation to the contour, said outer circumference representing the largest radial distance from the workpiece axis of rotation to the contour, said device comprising:

• a cutting tool having a cutting tip;
• a cutting tool holder for holding said cutting tool,
• a receptacle for releasably receiving said cutting tool holder;
• a drive unit for driving said receptacle, said drive unit having an input and an output,
• an input shaft having a fixed rotation axis, said input shaft connected at one end to a drive means,
• wherein said input shaft, drive unit and said receptacle share a common fixed housing,
• wherein said input shaft drives said drive unit,
• wherein said drive unit input drives said drive unit output such that said drive output describes a circular motion,
• wherein said drive unit output is coupled to said housing fixed against rotation but radially displaceable to describe said circular motion,
• wherein said circular motion movement of said driver unit output causes said receptacle, said cutting tool holder, and said cutting tool tip to describe a circular motion without rotation of the cutting tip, which circular motion from the outside is tangential to the inner circumference of the contour and from the inside is tangential to the outer circumference of the contour, wherein the cutting tip describes an orbit axis which lies half-way between said workpiece contour inner circumference and outer circumference, and
• wherein the orbital movement of said cutting tool circular motion is synchronized to said rotating work piece.

Device for machining a workpiece rotating with a constant rotational speed about an axis to produce a contour, wherein said contour has an imaginary inner circumference and an imaginary outer circumference, said inner circumference representing the shortest radial distance from the workpiece axis of rotation to the contour, said outer circumference representing the largest radial distance from the workpiece axis of rotation to the contour, said device comprising:

• a cutting tool having a cutting tip;
• means for moving said cutting tool such that its cutting tip describes a circular motion orbiting about an orbit axis, without rotation of the cutting tip, which circular motion is tangential when from the outside to the inner circumference of the contour and is tangential when from the inside to the outer circumference of the contour, wherein the orbit axis lies half-way between said workpiece contour inner circumference and outer circumference;
• wherein said cutting tool is secured to a work tool receptacle directly or via a tool carrier,
• wherein the work tool receptacle is connected with the housing of the device via a floating coupling which completely prevents rotational relative displacement and allows parallel displacement, and selectively the same floating coupling or a rolling bearing is used to prevent axial relative movements,
• wherein the work tool receptacle (47) is mounted in at least one eccentric sleeve and is angularly adjustable with respect to a rotating hollow spindle (41), in order to make adjustable the radial position of the work tool tip.

A device for machining a workpiece rotating with a constant rotational speed about a rotation axis to produce a contour, wherein said contour has an imaginary inner circumference and an imaginary outer circumference, said inner circumference representing the shortest radial distance from the workpiece axis of rotation to the contour, said outer circumference representing the largest radial distance from the workpiece axis of rotation to the contour, said device comprising:

• a stationary housing;
• a cutting tool having a cutting tip, said cutting tool mounted on a work tool holder;
• an elongate work tool receptacle having a first end and a second end, said work tool holder connected to said work tool receptacle second end,
• a drive unit for driving said work tool receptacle, said drive unit having an input and an output, said output connected to said work tool receptacle first end, and
• an input shaft for driving said drive unit input,
• wherein said work tool receptacle is coupled to said work tool housing secured against rotation relative to said work tool housing,
• wherein said drive unit output drives said work tool receptacle first end to describe a circular motion without rotating such that said work tool receptacle second end, said work tool holder, and said cutting tip describes a circular motion without rotating, said cutting tip orientation at every position being parallel, and
• wherein the movement of said work tool tip along said circular motion of is synchronized to said rotating workpiece.