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  1. Home
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  3. Kennametal’s new roughing and finishing solutions provide better results.

Kennametal’s new roughing and finishing solutions provide better results.

31 October, 2017
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By Niraj M Wanikar, Chief Editor, CNCTimes.com, 2017-10-31 11:26:00

Kennametal offers two new solutions for roughing and fine finishing, delivering lowest cost per part & consistently superior part quality in cast iron.

Iron’s everywhere. The turbines in those big windmills popping up all over the place. Engine blocks, transmission cases, and turbocharger housings. The pumps that bring water to our faucets and the hydraulic manifolds that put the “move” into earthmoving machinery. Without iron, none of these would be possible. This is why Kennametal has put so much effort into producing cutting tools that make iron machining both cost-effective, efficient, and ensures easy handling.

One significant step in this direction came a little over one year ago when Kennametal announced its Mill 16 face mill, the next generation in roughing tools designed specifically for removing large amounts of cast iron quickly, offering the highest productivity and lowest cost per edge in roughing and semi-finishing applications.

Making a change

Kennametal is pleased to announce that it is building on that success by expanding the Mill 16 platform by introducing new cutter body styles, new insert geometries and grades, and a split case design for large diameter bodies that reduces spindle bearing loads.

With these new additions, the portfolio will fit any of your cast iron face milling applications. From fine pitch wedge style cutters for highest productivity and very powerful machines to medium and coarse pitches screw-on cutters when horsepower is limited. From machining of small components to very large components.

The Mill 16’s new split case design meets truly massive machining needs, with wedge-style cutter bodies ranging from 300 to 500 mm (12 to 20 in.) in diameter. And for those worried about hanging such humungous cutters off their machine spindles, there’s good news: the largest split case Mill 16 cutter body weighs only 20.4 kg (48.45 lb.), roughly one-third that of competing designs, but still able to rotate at up to 2800 RPM (almost 15,000 SFM!).

And there is even more good news. All cutters use the same innovative, multi-edged design insert. An insert with 16 cutting edges that provides the lowest cost per cutting edge.The Mill 16 product line is covering all heavy roughing and semi-finishing applications. But what about finishing of cast iron?

Finishing up. Consistently with KCFM

To an engine manufacturer, flatness and finish is everything. Without it, leaks are sure to occur, leading to expensive warranty claims and unhappy customers. The same can be said for those making transmissions, hydraulic manifolds, pump bodies, and anywhere a smooth sealing surface is needed. Unfortunately, the material used to make many of these components—cast iron—can be challenging to machine.

There are many options available on the market for fine finishing of cast iron these days. And most of them can achieve the required surface finish.

But to keep it consistent is a different story

And that is one of the pain points for many customers. To have a consistent, reliable process when it comes to fine finishing of cast iron.The deterioration of the finishing occurs as soon as the inserts show slight wear. That causes an increase in cutter pressure, resulting in vibration, and feeding marks are observed. The result is downtime due to frequent insert exchange.

The super positive KCFM – Kennametal Cast Iron Finishing Milling – with the new KBK50 full top PCBN  (polycrystalline cubic boron nitride) grade was developed to address these issues.

Now customers can produce much more parts per edge in a reliable and consistent manner, so the cost per component will decrease.And keep in mind machining time reduces drastically since PCBN can be applied with 3 times higher cutting speeds compared to carbide inserts.

But there are more options with KCFM available than just PCBN                                   

Combining the semi-finishing KY3500 silicon nitrate ceramic with KBK50 finishing wiper inserts is also a  very productive, and cost-effective solution for customers that don’t want to have a full load PCBN inserts in the cutter. PCBN and ceramic grades are perfect for mass production and stable conditions.But in many cases, there is also the need for fine finishing on rather unstable conditions, such as weak workpiece clamping, limited spindle speed, long overhang, or when tooling cost is the primary consideration.

The answer to that the carbide grade KC514M. A TiAlN PVD coating that is both tough and wears resistant. Designed for light to medium machining. KC514M can be applied with or without cutting fluids.

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