Machining challenges – Sandvik Coromant presents the innovative CoroMill® 5B90

A high-performance tool for finishing aluminium components.

The greatest challenge when machining cylinder heads is to minimise the cycle time and at the same time produce components with close tolerances and a defined surface quality. Deburring, irregular tool wear and unpredictable insert tool-life typically provide long cycle times in the face milling operation.


Sandvik Coromant CoroMill® 5B90, a new finishing cutter for aluminium, scores with an excellent surface finish and reduces the cost-per-part by up to 30 per cent

The cylinder head conveys air, plus gasoline or diesel to the combustion chamber and serves as a cover for the cylinders. In most four-stroke engines it also mounts the valves, camshafts and works as a framework for a number of other components. It therefore needs to be strong and rigid. Thanks to the high thermal conductivity and low weight, the cylinder head is normally alloyed with aluminium.

Innovative CoroMill® 5B90 milling concept excels at high-performance machining of aluminium components with improved milling performance
Sandvik Coromant, a global leading supplier of cutting tools, tooling solutions and know-how to the metalworking industry, presents the innovative CoroMill® 5B90, a high-performance tool for finishing aluminium components. The state-of-the-art tool with an innovative cutting edge arrangement delivers excellent surface quality, without burr formation and reduces cost-per-part by up to 30 per cent. CoroMill 5B90 is ideally suited for typical automotive industry applications such as machining cylinder heads, gearboxes, valve blocks and motor block crankshaft and deck faces.

Numerous benefits
The new customer and application specific finishing cutter for aluminium allows a controlled, high-feed machining process, resulting in improved part quality. As no cost-intensive insert adjustment is necessary, set-up time can be reduced by up to 66 per cent. While each tool is custom-made for customers, Sandvik Coromant offers PCD inserts from stock.

Superior performance
When machining the cylinder heads of a four cylinder engine made from AlSi9Cu-1 at a cut depth of 0.7 mm the new CoroMill 5B90 (diameter of 160 mm, 9 cutting edges) achieved a tool life of 40 000 parts (at a rotational speed of 7 000 rev/min and a feed rate of 12 500 mm/min).

For further details contact Sandvik Coromant on TEL: 0860 101 008 or Mary-Ann Germishuys on TEL: 011 570 9615 or email: or visit