Learn how ISCAR’s innovations in direct cooling and chipbreaker geometry are reshaping tool performance, process stability, and surface quality. In the world of metal cutting, the key to efficient, high-quality machining lies in two critical factors: thermal management and chip control. At ISCAR, engineers have tackled both challenges simultaneously by developing advanced internal coolant delivery systems alongside high-performance chipbreakers. The result is a cutting-edge (literally) solution that delivers smoother operations, longer tool life, and superior surface finishes, even under the demanding conditions of mass production.
Direct Cooling – Born from a Real Need
The challenge was set for ISCAR’s Turning and Groove-Turn development teams: design tools that offer
smoother cutting, greater process stability, extended tool life, and improved surface finish, particularly
in mass production environments. The solution centered around an innovative approach to coolant channel
design—optimizing outlet angles, exact positioning, and flow rate—to achieve exceptional results in
targeted, high-efficiency cooling.
Advantages of Direct Cooling to the Cutting Edge
1. Significant Heat Reduction on the Insert
Excessive heat causes plastic deformation of the insert, altering its geometry and negatively impacting
machining accuracy, surface finish, and tool life. Direct cooling maintains a stable temperature at the
cutting edge, preventing these effects (Fig. 1).
2. Efficient Chip Evacuation
Improper chip evacuation leads to part damage, built-up material, and unnecessary cutting forces. Focused
cooling facilitates continuous chip flow, improving process stability and surface quality.
3. Prevention of Built-Up Edge Formation
Difficult-to-machine materials tend to stick to the cutting edge, forming a built-up edge. Direct cooling
significantly reduces this tendency, keeping the cutting zone clean and effective.
4. Maintaining Dimensional Stability of Long Parts
Direct cooling lowers overall temperature, helping prevent thermal distortion and bending in long or slender
components.
Coolant Channel Design – A Precise Science
Though internal coolant channels are hidden from view, their impact is dramatic. ISCAR develops smart
coolant geometries that deliver fluid precisely to the cutting zone. This targeted cooling (Fig. 2) extends
insert life, reduces machine downtime, shortens setup time, and optimizes the overall machining process.
Chipbreakers – The Critical Link to Machining Success
The chipbreaker is a fundamental component with a direct impact on cutting performance. Despite its vital
role, its importance is often overlooked. One of the most common challenges in machining is poor chip
control, especially during finishing, semi-finishing, or operations involving variable cutting depths. ISCAR
has taken the lead in this domain by developing new chipbreaker geometries (Fig. 3) suitable for a wide
range of materials, including steel, stainless steels, and superalloys.
How a Chipbreaker Works
Chipbreakers with an arched groove near the cutting edge force the chip to curl and break into a short
length. This prevents chip entanglement, reduces vibrations, extends tool life, and minimizes tool breakage.
Effective chip breaking also lowers resistance, decreases heat generation, and slows insert wear. A
well-designed chipbreaker contributes directly to longer insert life and improved process reliability (Fig.
4).
Choosing the Right Chipbreaker – Material, Conditions, and Application
When selecting a chipbreaker, several parameters must be considered:
• Material type (e.g., steel, stainless steel, superalloys)
• Cutting conditions: cutting speed (vc), feed rate (f), depth of cut (ap)
• Required surface quality: Finishing or roughing operations
The proper combination of chipbreaker design and direct cooling is the key to machining accuracy, consistency, and efficiency.
Conclusion
ISCAR remains committed to developing intelligent solutions that deliver real value to its customers. Direct
cooling at the cutting edge, combined with application-specific chipbreaker geometries, represents a
technological leap that enhances every critical performance metric—from tool life to surface quality.
Coolant channel design and chip control are no longer optional; they are the foundation of modern metal
cutting.
