Internal Turning

Operations, such as straight boring, profiling, grooving or pocketing, are characterized by being the most challenging as regards applying the coolant optimally, achieving suitable chips and evacuating chips safely and efficiently. For high pressure coolant applications there are a number of CoroTurn HP solutions that provide the benefits for internal machining — whatever the depth of hole.

The CoroTurn SL 32 and 40 boring bars with a round serrated lock coupling between boring bar and cutting head provide high pressure coolant machining for a large range of internal operations as part of boring bars. Silent Tools dampening provides reliable boring when tool overhangs are more than 10 times the diameter complemented by carbide reinforced dampening bars for up to 14 times the diameter.

With the advantages that high pressure coolant and vibration-dampening machining provides, Silent Tools and CoroTurn HP solutions ensure high security and the right surface finish and tolerance levels while allowing larger depths of cut, a reduced number of passes and higher feed rates — all of which means optimizing productivity.

The large range of boring bar, adaptor and toolholder alternatives provide the flexibility to build many different, optimized tools from a limited inventory.

This, to suit configurations and give accessibility in external or internal confined spaces using standard as well as engineered tooling.

Grooving, profiling and pocketing

The typical, common geometrical features that occur in many aerospace and power related components make demands on accessibility in external and internal confined spaces. This background has formed the basis for developing the CoroTurn SL70 concept for grooving, pocketing and profiling with the aid of high pressure coolant. An oval, serrated-face type coupling — between the modular tooling adaptor and the actual tool-blade holding the indexable insert — fulfills the requirements for stability and accuracy at long tool reach.

The range of SL70 blades in combination with Coromant Capto adaptors, which present cutting edges at different angles and overhangs, give the flexibility to build optimized tools from a limited standard-tool inventory.

Blades, some of which have built-in dampening as specials, perform extended reach deep into angled grooves or pockets of various sizes and shape. CoroTurn HP then adds the benefit of a fixed, accurate high-pressure coolant jet supplied through the tool to the cutting edge. The high pressure coolant provides the means t more efficiently machine materials typical in these type of components through reducing heat accumulation, improving chip breaking and also assisting in evacuating chips from recesses. As such, it changes a turning operation, which has by tradition been problematic, into a secure and productive process.

Multi-task machine benefit

Along with lathes and turning centers, the rising population of multi-task machines have also highlighted the benefits of turning with high pressure coolant especially from the chip control point of view. The disturbance due to stringy-chip accumulation when machining demanding alloys is critical as these machines are increasingly used by machine shops making aerospace, oil-industry and other similar components. Particularly when there is automated tool changing, long chips present a high risk to reliable unmanned production.

High pressure coolant machining targets these applications with the ability to force a fluid wedge into the machining zone, especially in turning operations classified as medium to finish turning, where the chip thickness is more controllable and chip breaking is generally more of a challenge.