For longitudinal and face turning, Sandvik Coromant now offers CoroTurn 300 metal cutting tools that are designed for high-volume, OD steel-turning operations.
The Sandvik CoroTurn 300 metal cutter features stable insert clamping. Its eight-edged inserts, with 80 degree cutting edges, provide high-chip control, and improved surface finish. The inserts ensure good heat transformation for predictable performance and wear. More edges also mean fewer inserts required, which in turn means better inventory control, and less carbide per edge means less waste and material to recycle.
Keep it Steady
Stable insert clamping for the CoroTurn 300 is accomplished through the company’s patented iLock interface. All machining generates forces on the metal cutting tools and these forces can cause micro-movements of the insert in its seat. Even the smallest movements can negatively affect tool performance and result.
To counter this, the iLock system securely locks the insert in place and provides tool accuracy to within ±0.05 mm (0.002 in.), giving the operator indexing repeatability for a better surface finish and increased tool life.
Tools with iLock design have rails or serrations on the tool holder and corresponding slots on the insert for tight locking. This prevents the cutting forces from affecting the tool position.
Keep it Cool
Another way the CoroTurn 300 offers enhanced chip breaking capabilities is through high-precision (HP) over and under coolant. Coolant from above controls the chip breaking for secure machining while under coolant controls the temperature for long and predictable tool life. Other features of the tool are the Coromant Capto interface in a variety of sizes and the Quick Start (QS) shanks, which enable quick tool changes and easy coolant connections for maximized production time.
John Winter, turning product specialist for Sandvik Coromant, said, “The CoroTurn 300 integrates the latest advances in iLock, Inveio [coating] and high-precision coolant technology to take steel turning into the next century using an insert with eight, 80 degree cutting edges. This is the perfect tool for high volume outer diameter (OD) steel turning applications where tool life and process security is a must.”
Sandvik Coromant recommends only under-coolant when the feed rate exceeds 0.2 mm/revolution and the depth of cut (DOC) is larger than the nose radius of the insert. Under these conditions, over-coolant might cause minor edge wear and increase crater wear in steel, and make it difficult to evaluate this wear. Conversely, if the DOC is either smaller than the nose radius or the feed rate is slower than 0.2 mm/revolution, using both over- and under-coolant is recommended, according to the Website.
For example, in one automotive application (an outer CV joint) a Sandvik Coromant CoroTurn 300 insert with -L4 geometry was used to turn low-alloy steel (P2.1.Z.AN) with 3 bar (43.5 psi; 300kPa) of coolant pressure at a feed rate of 0.35 mm/revolution and a 2.5-mm DOC.
The CoroTurn (CT) insert delivered a 158% improvement in tool life versus an insert with -PF geometry, while the same CT300 insert delivered a 200% tool life improvement using only under-coolant.
Keep it Coated
The eight-edged inserts for the CoroTurn 300 are available in grades GC4325 and GC4315 featuring Inveio coating, a unidirectional crystal orientation for high wear resistance and long tool life. The unique insert design has excellent chip breaking capabilities and less carbide per edge, which reduces the impact on our environment with less material to waste or recycle. Plus, more edges allow for better inventory control.
The coating is applied through a chemical vapor deposit process (CVD) that through a chemical process turns a solid firm into a gaseous deposit onto the substrate.
Typically, when using this process, the coatings’ crystal growth direction is random. When developing Inveio™, Sandvik found a way to control the growth in this coating layer. Researchers were able to ensure that all of the crystals lined up in the same direction, with the strongest part towards the top surface.
The tightly-packed uni-directional crystals create a strong barrier towards the cutting zone and chip and greatly improves crater wear and flank-wear resistance. Heat is more rapidly lead away from the cutting zone, helping the cutting edge stay in shape for longer times in cut.
For more information on the CoroTurn 300, contact your Steiner Metalworking application engineer at (800) 323-TOOL.