Insert Grade Shines in Continuous, High-Speed Turning

The Hoffmann Group’s Garant HB 7010-1 turning grade features P10 gradient carbide for wear resistance at the highest cutting speeds.

According to the company, HB70xx line’s smooth exterior and ductile interior was inspired by sharks’ teeth. The Garant HB 7010-1 offers a wear-resistant and thermo-resistant CVD coating made of aluminum oxide Al203 and titanium carbonitride Ti(CN), which protects the carbide substrate even at high cutting speeds and process temperatures. The carbide substrate is particularly resistant to plastic deformation, splintering, and brittle fracturing because it is extremely ductile. As a result, this grade offers potential for extended tool life during continuous cutting at high speeds, the company says. 

Straightened crystal structures are a key factor in the resistance of this coating. Its extremely smooth surface enables optimum chip evacuation and reduces the friction between the component and the tool material, lowering process temperatures.

In contrast to the casing, the core of the indexable insert is ductile. The carbide substrate is graded, which means that it has an increased proportion of titanium nitride in the outer layer in order to adapt the thermal expansion coefficient to the coating. As a result, the coating optimally adheres to the substrate, the company says. It adds that because of the similar thermal expansion coefficient, the coating cannot shear away, even at high process temperatures.