Sandvik Coromant's new-generation CoroBore 825Click image to enlarge

Sandvik Coromant has released a new-generation CoroBore 825 dampened fine boring tool.

The system makes use of Silent Tools technology, with dampers dimensioned to suit every adapter size in the assortment. The system is designed to improve process security where vibration issues are frequently encountered, such as when machining with long overhangs, and to increase cutting data significantly.

Among the principal updates is the change of boring head material from steel to aluminum. In addition, the head has been shortened so that the damper comes closer to the cutting edge, which supports process stability.

“Internal channels are utilized 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,” says Jenny Nilsson, global product manager at Sandvik Coromant. “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. Further extensions will reduce stability and performance.”

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

CoroBore 825 is designed for fine-boring applications, covering diameters from 19 to 167 mm (0.748 to 6.575 in.), while a new assortment of cartridges can be utilized for back boring applications. During back boring, the same internal coolant flow to the cutting edge is offered as in conventional boring.

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