Latest milling grades improve tool life

Posted on 11 Jan 2019 and read 606 times
Latest milling grades improve tool life Cutting tool and tooling systems specialist Sandvik Coromant (www.sandvik.coromant.com) has launched two new insert grades for steel milling — GC4330 and GC4340.

These feature a new substrate, the company’s Inveio coating and an improved “post-treatment technology”, allowing the new grades to offer substantially increased tool life and process security when compared with the previous-generation grades GC4230 and GC4240, which have now been superseded.

Sandvik says manufacturers face many challenges when milling ISO P workpieces, including the fact that some hard and abrasive steels can generate wear along the flank face of the insert, especially at higher speeds and with a longer time in cut.

In addition, machining in unstable conditions due to compromised clamping or long overhang increases the risk of insert chipping, while thermal fluctuation during machining — especially under wet conditions — can cause crack formation and subsequent sudden breakages.

Magnus Engdahl, product application manager at Sandvik Coromant, says the new grades overcome these issues in a number of ways. “For instance, the Inveio coating increases wear-resistance and tool life dramatically, without jeopardising security.

"With its uni-directional crystal orientation, the coating has a high resistance to thermal cracks, which in turn promotes long and reliable tool life — a factor further supported by a new post-treatment process that strengthens the insert by modifying its mechanical properties.

"Furthermore, a newly developed substrate provides well-controlled grain size distribution, which provides more-reliable and predictable tool behaviour, while a more-narrow edge-rounding tolerance ensures consistent tool life.”

GC4330 is a medium-hard grade and is the first choice for roughing to semi-finish face milling, with the tough GC4340 grade preferred for rough shoulder milling and groove milling; and while both wet and dry machining are accommodated, dry machining is recommended.

Both GC4330 and GC4340 are available in the following product families: CoroMill 390 and CoroMill 490 for shoulder milling; CoroMill 345 and CoroMill 745 for face milling; CoroMill 210 for high-feed milling; CoroMill 200 for profile milling; and CoroMill 331 for grooving and parting off.

Moreover, Sandvik says that while the grades are optimised for steel, they can also be used for mixed production involving ISO K (cast iron) and ISO M (stainless steel) workpieces.

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