Cutting Tool Engineering
December 2011 / Volume 63 / Issue 12

Long, hard life

By Alan Richter, Editor

The aerospace industry is grinding more hardened ferrous metals and nickel-base superalloys and the automotive industry is grinding more difficult-to-machine drivetrain components. As a result, Element Six Ltd. introduced the ABN900 CBN superabrasive for electroplated grinding wheels to tackle those challenges, according to Ned Vaughan, the superabrasive material manufacturer’s product manager for precision grinding. “There are a multitude of other applications, especially where you’re looking to generate a form on a steel component,” he said, “but the predominant applications where we see benefits are in aerospace and automotive.”

ABN900 SEM_.tif
Courtesy of Element Six

A scanning electron microscope image shows Element Six’s ABN900 80/100 U.S. mesh grit size.

In addition to boosting productivity, Vaughan noted that a wheel made with ABN900 particles, which have a consistent blocky shape, exerts lower grinding forces than a wheel using previous grades to allow cooler cutting and minimize thermal damage to the component.

The biggest distinction between the new grade and others is extended tool life, according to Vaughan. In a test at the company’s laboratories against two other Element Six products (ABN300 and ABN800) and a leading competitor’s product for electroplated applications, the company reported that ABN900 outperformed all of them. That included a 55 percent improvement in tool life vs. the competitor’s CBN when grinding GGG70 SGI, a cast iron often used in auto parts, with a grit size of 120/140 U.S. mesh. ABN900 is available from 30/35 to 170/200 U.S. mesh and is suitable for roughing and finishing.

One property that helps extend wheel life is the material’s high strength. The new grade’s CBN grits are stronger than previous grades at room and elevated temperatures, noted Siobhan Duffy, business manager for advanced materials at Element Six. “We tested ABN900 at 1,100° C in an inert atmosphere and it has higher thermal stability strength in comparison to our other grades,” she said.

For more information about Element Six Ltd., Shannon, Ireland, call +353-614-60146 or visit www.e6.com. CTE

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