Extension of steel milling grades brings better tool life to more users

02 July 2019 | Web Article Number: ME201915037

Machine Tools
Metals & Alloys
Extension of steel milling grades brings better tool life to more users

FOLLOWING the introduction of its latest-generation GC4330 and GC4340 steel milling grades in 2018, cutting tool and tooling systems specialist Sandvik Coromant is extending the range of application for these advanced insert grades to additional milling concepts.

For instance, the grades are now available for selection with the CoroMill 300 round-insert face and profile mill, the CoroMill 245 multi-purpose face milling cutter, and the CoroMill QD cutter, which is optimized for deep and narrow grooving and parting off.

The GC4330 and GC4340 grades, which feature a specially developed substrate, Inveio coating and enhanced post-treatment technology, boast increased tool life and process security. According to the company, extending these grades to additional Sandvik Coromant milling concepts brings their advantages to even more machine shops looking to optimize the milling of steel workpieces.

“GC4330 and GC4340 have been purpose-designed to overcome certain issues when machining steel components. For instance, some hard and abrasive steels can promote wear along the insert’s flank face, particularly at elevated speeds and longer time in cut,” said Karl Emil Holmström, Global Product Application Manager Grades at Sandvik Coromant

“What’s more, machining in unstable conditions as a result of compromised fixturing or long overhang increases the risk of chipped inserts. A further risk is thermal fluctuation during machining which, especially in wet conditions, can lead to crack formation and sudden breakages.”

According to the company, the unidirectional crystal orientation in the Inveio alumina coating layer gives inserts a new level of wear resistance and tool life. “Furthermore, the substrate of the grades delivers highly controlled grain size distribution for more reliable and predictable insert behaviour.”

GC4330 is a medium-hard grade for roughing to semi-finish face milling, with the tough GC4340 grade preferred for rough shoulder milling and groove milling. Both grades are now extended to the aforementioned CoroMill 245 and CoroMill 300, as well as the CoroMill 360 heavy-duty face mill, CoroMill 419 high-feed mill, and LPMH-PM plunge-cutter inserts.

In addition, GC4330 is available for the CoroMill 365 high-security face mill, while GC4340 can be applied to the CoroMill 216 ball-nose end mill and CoroMill 415 small-diameter high-feed face mill, along with the CoroMill QD cutter.

This list adds to the existing availability of both grades for CoroMill 390 and CoroMill 490 shoulder mills, CoroMill 345 face mills, CoroMill 210 high-feed cutters, CoroMill 200 profile mills and CoroMill 331 for grooving and parting off.

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