There is growing demand for aerospace engine parts that can withstand extreme temperatures beyond the capability of those made from Inconel and other high-performance super alloys. Although these powder metallurgic materials can be tailored to handle substantially higher temperatures, they are more difficult to machine than common HRSAs.
“CC6220 and CC6230 excel when turning demanding materials in intermediate stage machining,” says Rolf Olofsson, Product management turning at Sandvik Coromant. “They take productivity to a new level in comparison with whisker ceramics and SiAlONs, in terms of both cutting speeds and feeds. Moreover, repeatable quality is assured.”
Along with productivity improvements of more than 50% over whisker ceramics and SiAlONs, CC6220 and CC6230 offer long tool life in challenging HRSAs, and thereby lower cost per part.
One of the most common applications to benefit is expected to be the turning of turbine discs. In a customer example machining a low-pressure turbine (LPT) disc made from Rene material (42-45 HRc) as part of the intermediate stage machining process, a CC6220 RPGX insert was deployed to perform pocketing and CC6230 RPGX inserts for rough-turning operation at cutting speeds as high as 400 m/min (1380 sfm). The process achieved a metal removal rate (MRR) of 80 cm3/min (5 inch3/min).
Similar success was achieved for a subsequent semi-finishing operation at lower cutting speed and long time in cut. Importantly, all of the specified quality requirements were attained on a repeatable basis thanks to the process security provided by the new grade.
Aside from the aerospace industry, other sectors expected to benefit from CC6220 and CC6230 include power generation (turbine components in Inconel and Hastelloy), and oil and gas (parts cladded with Stellite 6, for example).
Part of global industrial engineering group Sandvik, Sandvik Coromant is at the forefront of manufacturing tools, machining solutions and knowledge that drive industry standards and innovations demanded by the metalworking industry now and into the next industrial era. Educational support, extensive R&D investment and strong customer partnerships ensure the development of machining technologies that change, lead and drive the future of manufacturing. Sandvik Coromant owns over 3100 patents worldwide, employs over 7,900 staff, and is represented in 150 countries.
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