Cutting-tool and tooling-system specialist Sandvik Coromant has introduced a new-generation CoroBore 825 damped fine-boring tool that makes use of the company’s trademarked Silent Tools technology, with dampers dimensioned specifically to suit every adapter size in the assortment and deliver maximum performance for the user.

This solution not only improves process security where vibration issues are frequently encountered (such as when machining with long overhangs) but also improves productivity, as cutting data can be increased substantially.

Among the principal differences in the latest-generation tools is the change of boring-head material from steel to aluminium; the head has also been shortened so that the damper comes closer to the cutting edge, which is
beneficial for process stability.

Jenny Nilsson, global product manager at Sandvik Coromant, said: “Internal channels are used to deliver coolant directly to the cutting edge, which is another factor that contributes to improved surface finish, higher penetration rates and greater process security.

“The new generation of tools will provide optimum performance and stability, with one standard ‘adaptive item’ on the machine tool side to ‘bridge’ the tool into a steep-taper, HSK or Coromant Capto spindle.”

The CoroTurn insert carriers for the new tools have entering angles at 92-95deg, which increases stability due to reduced tool assembly deflection, making it possible to approach the bottom of a blind hole without engaging a bigger part of the cutting edge.

Sandvik says CoroBore 825 is ideal for all fine-boring applications and covers diameters from 19 to 167mm.

A new assortment of cartridges can be used for back-boring applications; these use the same internal coolant flow to the cutting edge as with conventional boring.

Further information can be found at the Web site (www.sandvik.coromant.com/en-gb/products/corobore_825_826).