Cutting tool, particularly a boring bar, as well as a process for machining a number of bores

#This application is a U.S. National Phase of PCT/EP2014/001486, filed Jun. 3, 2014, which claims the benefit of German Application No. 10 2013 210 332.8, filed Jun. 4, 2013, each of which are incorporated by reference in their entireties.

#The invention relates to a rotating cutting tool, particularly a boring bar with the features of the preamble of claim 1 as well as a process for machining with the assistance of such a cutting tool a number of bores that are particularly spaced apart from one another by a predetermined spacing in the axial direction.

#A boring bar of this type as well as a process of this type can be found in EP 0 771 602 B1.

#Each figure shows in simplified, schematic diagrams:

#FIG. 1A,B shows a boring bar at the start and at the end of a machining process, which is inserted in multiple bores spaced apart from one another in a partial section of a side representation;

#FIG. 2 shows a front view of a boring bar;

#Parts having the same effect are given the same reference numbers in the figures.

#According to the two embodiments shown in FIG. 1A, 1B, and/or FIG. 5A, 5B, 5C, a boring bar 2, which is also designated as a line boring bar, extends in the axial direction 4 from a backside coupling 6 to a front end surface 8. Following the coupling 6, the boring bar 2 has a rod-shaped basic body 10, to which cutting elements 12 axially spaced apart from one another are attached to the basic body 10 in a respective working position. All of the cutting elements 12 in this case are arranged on the basic body 10 in the same angle position; they thus lie on a line. Only one cutting element 12 per working position is arranged on the basic body 10. Furthermore, guide elements 14 formed as a type of guide rails on the basic body are arranged at a guide position of the basic body 10. The cutting elements 12 and the guide elements 14 form function elements.

#As an alternative to the variant shown with the positioning of the cutting elements 12 each at identical angle positions, the function elements, particularly the cutting elements 12, are arranged at the various axial positions at different angle positions. This serves particularly to reduce the tendency to vibrate. The cutting elements in this case are arranged offset, preferably only by a few degrees (e.g. less than 10°), with respect to a defined target angle position.