High-performance cBN inserts for efficient hard turning

Achieve efficient hard machining with CBN indexable inserts

CBN indexable inserts (cubic boron nitride) are superhard, high-performance cutting tips that rank second only to diamond in hardness. Specifically designed for hard machining, these inserts enable economical turning and milling of hardened steels, cast irons and heat-resistant superalloys, often replacing time-consuming and costly grinding operations in modern production.

Where and how these inserts deliver measurable performance gains

The material properties of cubic boron nitride (CBN) determine application and process design. CBN inserts are most commonly used in tool systems without internal coolant and in dry machining, because the material is highly sensitive to thermal shock: irregular external coolant can induce microcracks and chipping at the cutting edge. In specialised scenarios — for example when machining certain aerospace-grade superalloys — CBN inserts are used with toolholders that supply high-pressure, continuous coolant through internal channels, delivering constant thermal control, reducing wear and ensuring reliable chip evacuation.

Key benefits that cut cycle times and production cost

• Replace grinding steps by enabling direct turning or milling of hardened components, shortening overall process chains.
• Improve process security through stable, wear-resistant cutting edges suited to prolonged hard machining.
• Minimise thermal shock risk in typical dry setups, reducing the likelihood of chipping and unexpected tool failure.
• Allow targeted use with internal-coolant tool systems where uninterrupted coolant delivery is required to machine specific heat-resistant alloys.
• Facilitate economical machining of cast iron and superalloys that would otherwise demand complex downstream finishing.

Why Metav’s range is the practical choice for workshops and production lines

Metav brings decades of precision expertise to the supply of CBN indexable inserts, acting as a quality filter for the European market from Emmerich. As a precision partner for industry and trade, Metav combines a comprehensive selection with dependable delivery and technical competence, so procurement teams reduce supplier complexity while securing tools that perform in demanding hard machining tasks.

Compact summary for quick specification checks

CBN indexable inserts offer a high-hardness solution for turning and milling hardened steels, cast irons and superalloys, enabling the replacement of grinding operations where process design accounts for thermal control. Use them predominantly in dry machining or in tool systems with continuous internal coolant for specialised alloys.

FAQ

What materials are CBN indexable inserts best suited to?
CBN indexable inserts are optimised for hardened steels, various cast iron grades and heat-resistant superalloys; they are chosen when direct machining can economically replace grinding processes.

Can CBN inserts be used with external coolant?
In most cases, CBN inserts are used without external coolant because the material is sensitive to thermal shock; cooling must be uniform and continuous, so external, irregular coolant application is generally avoided.

When is internal coolant necessary with CBN inserts?
Internal coolant is employed in very specific scenarios, for example when machining certain aerospace superalloys; the coolant must be delivered continuously and directly to the cutting edge under high pressure to ensure thermal stability and reliable chip evacuation.

How do CBN inserts affect overall process costs?
By enabling turning or milling of hard materials and often eliminating subsequent grinding, CBN indexable inserts reduce process steps and can lower total cycle time and production costs when appropriately applied.

Are CBN inserts prone to chipping?
CBN itself is extremely hard but sensitive to thermal shock; chipping and microcracks are more likely if coolant is applied irregularly at the cutting zone, which is why process design favours dry machining or controlled internal coolant delivery.