It is a crucial parameter since it indicates the resistance to cracks, breakages, and impact of the carbide grades. Therefore a Tougher Grade will have better performance and longer tool-life in conditions such as:
- Machining with heavy impacts such as Milling or intermitted turning.
- Machining where the material is being pushed rather than cut, such as parting-off to the center of a workpiece.
Unfortunately, better toughness always means lower hardness resulting in a grade with less wear resistance.
Finding the right balance between Harness and Toughness in a carbide grade is the #1 factor in its suitability for an application!
- Tough grades will have a larger grain size and higher cobalt content.