Kennametal Develops Vibration-Free Boring System
December 6, 2018
Kennametal has developed a new boring system that boasts an effective anti-chatter mechanism, and also offers an extensive range of indexable heads and shank sizes.
Someone who knows all about it is Sam Eichelberger, product engineer for lathe systems engineering and part of the team that developed the internal dampening mechanism. “Perhaps the most important thing to know about the new bar is that it’s plug and play,” he says. “There's no need whatsoever for tuning or adjustments—you simply pull it out of the package, mount it in the turret, and get boring.”
Eliminating vibration and therefore chatter greatly extends tool life, never mind its positive effect on part surface finish. And when tools last longer, they can be pushed harder, with feed rates, cutting speeds, and depths of cut many industry experts once thought unachievable.
Eichelberger is one of them. He lists a number of features that not only make the vibration-free boring system the most easy-to-apply bar you’ll ever bore with, but also the most productive. These include a serrated, bolt-on connection at the bar’s business end that securely clamps a variety of styles and sizes of indexable heads.
Better yet, the heads themselves have been put on a diet, with a shorter length and lighter weight that provides greater stability, contributing to the bar’s improved performance. They’re also coolant-fed, to precisely direct a stream of high-pressure coolant where it’s needed most. The result is hassle-free chip control together with maximum cooling in the cutting zone.
Most important of all is the internal dampener. Said Eichelberger, “The bars are both vibration and maintenance free. Within the bar there sits a mass that's supported by a pair of elastic supports, inside of which sits a dampening fluid. This mass vibrates at a predetermined frequency during machining, attenuating the natural frequency of the bar around it to suppress vibration."
Considering the higher cost of such a boring system, they’ll also appreciate the fact that the heads are replaceable in the event of a crash, avoiding damage to the bar itself. And users of Kennametal’s older boring system will find that their new heads fit perfectly with the use of an adaptor.
“The portfolio for our Imperial bars ranges from one-inch in diameter up to four inches, while the metric version starts at 25 mm and goes to 100 mm,” Gable said. “There are a variety of interchangeable head styles available as well, everything from screw-on positive rake inserts for fine-finishing needs to negative rake, clamp-style geometries for heavy roughing. The bar’s designed to excel in demanding applications, and that’s exactly what it does.”
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