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Sandvik Coromant’s CoroMill 390 features an additively manufactured cutter body for lighter overall weight, which reduces vibration and increases rigidity when machining when long overhangs are required.

”When designing our new lightweight CoroMill 390, material was tactically removed to create the optimal cutter design for minimizing mass,” explains Thomas Wikgren, manager of product application. “This is called topological optimization, and it makes the cutter more compact and significantly lighter than a conventional version, thus helping machine shops to boost the productivity of their long-overhang milling operations. Moreover, a shorter distance between the damper in the adapter and the cutting edge improves performance and process security.”

The company explains that process security is paramount when milling with long overhangs, which is a common requirement in the manufacture of aerospace and oil and gas components. In such cases, vibration can compromise the generation of features such as deep cavities, leading to slower production, shorter tool life and poor surface finish. The lightweight CoroMill 390 is intended to provide a solution to this issue. The tool can be combined with the company’s Silent Tools milling adapter to damp vibration.

The CoroMill 390 can perform long-reach face milling, deep shoulder and side milling, cavity milling, and slot milling. The tool is available in diameters of 40 mm (arbor 16 coupling) and 50 mm (arbor 22 coupling). Three or four inserts (size 11) can be specified to suit the application. Differential pitch and internal coolant are provided on all cutters.