Adding an Edge to Traditional Inserts Boosts Productivity

According to Iscar, the invention of Helimill in the 1990’s – said to be the first indexable sintered carbide insert with a helical cutting edge – elevated the company’s reputation as a producer of milling tools. The helical cutting edge, produced by the intersection of a helical relief surface and a rake face with a complex shape, ensures positive and constant rake angles along the whole edge.

This provided practical benefits, the company noted: smooth cutting action, advantageous chip formation, lower cutting forces and power consumption, better tool life and more. As a result, the helical cutting edge significantly increased productivity and improved tool performance. Almost every indexable milling tool, especially cutters intended for machining 90° shoulders, relies on the helical cutting edge as a basic design principle, it noted.

Two edges good, three edges better

Today, Helimill milling cutters feature a broad spectrum of insert geometries and sizes. Such a variety is said to ensure success of the original cutters in practically all shoulder milling operations. They machine all types of engineering materials and the accuracy of machined surface and its roughness have been good enough. But the company said it has improved the technology with the Heliqmill 390 line – a further development of inserts with helical cutting edges.

The classical insert and its derivatives have two cutting edges. The new line offers a triangular insert with three cutting edges. Interestingly, the length of the cutting edge of an insert with three edges is the same as for an insert with two, the company explained, noting that the new inserts are available with 10 and 15 mm cutting edge lengths.

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